SLVSCA6C October   2013  – October 2017 TPS65311-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
      1. 7.8.1 BUCK 1 Characteristics
      2. 7.8.2 BUCK 2 and BUCK3 Characteristics
      3. 7.8.3 BOOST Characteristics
      4. 7.8.4 LDO Noise Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Buck Controller (BUCK1)
      2. 8.3.2  Synchronous Buck Converters BUCK2 and BUCK3
      3. 8.3.3  BOOST Converter
      4. 8.3.4  Frequency-Hopping Spread Spectrum
      5. 8.3.5  Linear Regulator LDO
      6. 8.3.6  Gate Driver Supply
      7. 8.3.7  RESET
      8. 8.3.8  Soft Start
      9. 8.3.9  Power-on Reset Flag
      10. 8.3.10 WAKE Pin
      11. 8.3.11 IRQ Pin
      12. 8.3.12 VBAT Undervoltage Warning
      13. 8.3.13 VIN Over or Undervoltage Protection
      14. 8.3.14 External Protection
      15. 8.3.15 Overtemperature Detection and Shutdown
      16. 8.3.16 Independent Voltage Monitoring
      17. 8.3.17 GND Loss Detection
      18. 8.3.18 Reference Voltage
      19. 8.3.19 Shutdown Comparator
      20. 8.3.20 LED and High-Side Switch Control
      21. 8.3.21 Window Watchdog
      22. 8.3.22 Timeout in Start-Up Modes
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operating Modes
        1. 8.4.1.1  INIT
        2. 8.4.1.2  TESTSTART
        3. 8.4.1.3  TESTSTOP
        4. 8.4.1.4  VTCHECK
        5. 8.4.1.5  RAMP
          1. 8.4.1.5.1 Power-Up Sequencing
          2. 8.4.1.5.2 Power-Down Sequencing
        6. 8.4.1.6  ACTIVE
        7. 8.4.1.7  ERROR
        8. 8.4.1.8  LOCKED
        9. 8.4.1.9  LPM0
        10. 8.4.1.10 SHUTDOWN
    5. 8.5 Programming
      1. 8.5.1 SPI
        1. 8.5.1.1 FSI Bit
    6. 8.6 Register Map
      1. 8.6.1 Register Description
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Buck Controller (BUCK1)
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Adjusting the Output Voltage for the BUCK1 Controller
          2. 9.2.1.2.2 Output Inductor, Sense Resistor, and Capacitor Selection for the BUCK1 Controller
          3. 9.2.1.2.3 Compensation of the Buck Controller
          4. 9.2.1.2.4 Bootstrap Capacitor for the BUCK1 Controller
        3. 9.2.1.3 BUCK 1 Application Curve
      2. 9.2.2 Synchronous Buck Converters BUCK2 and BUCK3
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Adjusting the Output Voltage for the BUCK2 and BUCK3 Converter
          2. 9.2.2.2.2 Output Inductor Selection for the BUCK2 and BUCK3 Converter
          3. 9.2.2.2.3 Compensation of the BUCK2 and BUCK3 Converters
          4. 9.2.2.2.4 Bootstrap Capacitor for the BUCK2/3 Converters
        3. 9.2.2.3 BUCK2 and BUCK3 Application Curves
      3. 9.2.3 BOOST Converter
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
          1. 9.2.3.2.1 Adjusting the Output Voltage for the Boost Converter
          2. 9.2.3.2.2 Output Inductor and Capacitor Selection for the BOOST Converter
          3. 9.2.3.2.3 Compensation of the BOOST Converter
          4. 9.2.3.2.4 Output Diode for the BOOST Converter
        3. 9.2.3.3 BOOST Converter Application Curves
      4. 9.2.4 Linear Regulator
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
          1. 9.2.4.2.1 Adjusting the Output Voltage for the Linear Regulator
          2. 9.2.4.2.2 Output Capacitance for the Linear Regulator
        3. 9.2.4.3 Linear Regulator Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Buck Controller
      2. 11.1.2 Buck Converter
      3. 11.1.3 Boost Converter
      4. 11.1.4 Linear Regulator
      5. 11.1.5 Other Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
Supply inputs VIN –0.3 80 V
VINPROT –0.3 60
VSUP2, 3 (BUCK2 and 3) –0.3 20
VSUP4 (Linear Regulator) –0.3 20
VBOOST –0.3 20
EXTSUP –0.3 13
VIO –0.3 5.5
Buck controller PH1 –1
–2 for 100 ns		 60 V
VSENSE1 –0.3 20
COMP1 –0.3 20
GU-PH1, GL-PGND1, BOOT1-PH1 –0.3 8
S1, S2 –0.3 20
S1-S2 –2 2
BOOT1 –0.3 68
VMON1 –0.3 20
Buck controller BOOT2, BOOT3 –1 20 V
PH2, PH3 –1(4)
–2 for 10 ns 		20(4)
VSENSE2, VSENSE3 –0.3 20
COMP2, COMP3 –0.3 20
VMON2, VMON3 –0.3 20
BOOTx – PHx –0.3 8
Linear regulator LDO_OUT –0.3 8 V
VSENSE4 –0.3 20
Boost converter VSENSE5 –0.3 20 V
PH5 –0.3 20
COMP5 –0.3 20
Digital interface CSN, SCK, SDO, SDI, WD, HSPWM –0.3 5.5 V
RESN, PRESN, IRQ –0.3 20
Wake input WAKE –1(3) 60 V
Protection FET GPFET –0.3 80 V
VIN – GPFET –0.3 20
Battery sense input VSSENSE –1(3) 60
Transients up to 80 V(2) 		V
Temperature sense VT –0.3 5.5 V
VT_REF –0.3 20
Reference voltage VREF –0.3 5.5 V
High-side and LED driver HSSENSE –0.3 60 V
HSCTRL –0.3 60
VINPROT-HSSENSE, VINPROT-HSCTRL –0.3 20
Driver supply decoupling VREG –0.3 8 V
Supply decoupling DVDD –0.3 3.6 V
Temperature ratings Junction temperature range, TJ –55 150 °C
Operating temperature range, TA –55 125
Storage temperature, Tstg –55 165
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Internally clamped to 60-V, 20-kΩ external resistor required, current into pin limited to 1 mA.
(3) Imax = 100 mA
(4) Maximum 3.5 A

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per AEC Q100-002(1) ±1000 V
Charged-device model (CDM), per AEC Q100-011 VT pin ±150
Corner pins (1, 14, 15, 28, 29, 42, 43, and 56) ±750
All other pins ±500
(1) AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
Supply voltage at VIN, VINPROT, VSSENSE 4.8 40 V
TA Operating free air temperature All electrical characteristics in specification –40 125 °C
Shutdown comparator and internal voltage regulators in specification –55 125
TJ Operating virtual junction temperature All electrical characteristics in specification 150 °C
Shutdown comparator and internal voltage regulators in specification 150

7.4 Thermal Information

THERMAL METRIC(1) TPS65311-Q1 UNIT
RWE (VQFNP) RVJ (VQFN)
56 PINS 56 PINS
RθJA Junction-to-ambient thermal resistance 22.1 22.3 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 9.6 9.8 °C/W
RθJB Junction-to-board thermal resistance 6.2 6.3 °C/W
ψJT Junction-to-top characterization parameter 0.1 0.1 °C/W
ψJB Junction-to-board characterization parameter 6.2 6.2 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 0.4 0.7 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

7.5 Electrical Characteristics

VIN = VINPROT 4.8 V to 40 V, VSUPx = 3 V to 5.5 V, EXTSUP = 0 V, TJ(max) = 150°C, unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT VOLTAGE-CURRENT CONSUMPTION
VIN Device operating range Buck regulator operating range, Voltage on VIN and VINPROT pins 4 50 V
VPOR Power-on reset threshold Falling VIN 3.5 3.6 3.8 V
Rising VIN 3.9 4.2 4.3
VPOR_hyst Power-on reset hysteresis on VIN 0.47 0.6 0.73 V
ILPM0 LPM0 current consumption(1)(3) All off, wake active, VIN = 13 V
Total current into VSSENSE, VIN and VINPROT		 44 μA
ILPM0 LPM0 current (commercial vehicle application) consumption(2)(3) All off, wake active, VIN = 24.5 V
Total current into VSSENSE, VIN and VINPROT		 60 μA
IACTIVE1 ACTIVE total current consumption(1)(4) BUCK1 = on, VIN = 13 V, EXTSUP = 0 V,
Qg of BUCK1 FETs = 15 nC.
Total current into VSSENSE, VIN and VINPROT		 32 mA
IACTIVE123 ACTIVE total current consumption(1)(4) BUCK1/2/3 = on, VIN = 13 V,
Qg of BUCK1 FETs = 15 nC.
Total current into VSSENSE, VIN and VINPROT		 40 mA
IACTIVE1235 ACTIVE current consumption(1)(4) BUCK1/2/3, LDO, BOOST, high-side switch = on,
VIN = 13 V, Qg of BUCK1 FETs = 15 nC.
EXTSUP = 5 V from BOOST
Total current into VSSENSE, VIN and VINPROT		 31 mA
IACTIVE1235_noEXT ACTIVE current consumption(1)(4) BUCK1/2/3, LDO, BOOST, high-side switch = on,
VIN = 13 V, Qg of BUCK1 FETs = 15 nC,
EXTSUP = open
Total current into VSENSE, VIN and VINPROT		 53 mA
BUCK CONTROLLER (BUCK1)
VBUCK1 Adjustable output voltage range 3 11 V
VSense1_NRM Internal reference voltage in operating mode VSENSE1 pin, load = 0 mA,
Internal REF = 0.8 V		 –1% 1%
VS1-2 VS1-2 for forward OC in CCM Maximum sense voltage VSENSE1 = 0.75 V (low duty cycle) 60 75 90 mV
Minimum sense voltage VSENSE 1 = 1 V (negative current limit) –65 –37.5 –23
ACS Current sense voltage gain ∆VCOMP1 / ∆ (VS1 - VS2) 4 8 12 V/V
IGpeak Gate driver peak current VREG = 5.8 V 0.6 A
RDSON_DRIVER Source and sink driver IG current for external MOSFET = 200 mA,
VREG = 5.8 V, VBOOT1-PH1 = 5.8 V		 5 10 Ω
VDIO1 Bootstrap diode forward voltage IBOOT1 = –200 mA, VREG-BOOT1 0.8 1.1 V
ERROR AMPLIFIER (OTA) FOR BUCK CONTROLLERS AND BOOST CONVERTER
gmEA Forward transconductance COMP1/2/3/5 = 0.8 V; source/sink = 5 µA,
Test in feedback loop		 0.9 mS
AEA Error amplifier DC gain 60 dB
SYNCHRONOUS BUCK CONVERTER BUCK2 AND BUCK3 (BUCK2/3)
VSUP2/3 Supply voltage 3 11 V
VBUCK2/3 Regulated output voltage range Iload = 0…2 A
VSUPx = VBUCK2/3 + Iload × 0.2 Ω		 0.8 5.5 V
RDSON-HS RDSON high-side switch VBOOTx –PHx = 5.8 V 0.20 Ω
RDSON-LS RDSON low-side switch VREG = 5.8 V 0.20 Ω
IHS-Limit High-side switch current-limit Static current limit test.
In application L > 1 µH at
IHS-Limit and ILS-Limit to limit dI / dt		 2.5 2.9 3.3 A
ILS-Limit Low-side switch current-limit Static current limit test.
In application L > 1 µH at
IHS-Limit and ILS-Limit to limit dI / dt		 2 2.5 3 A
VSUPLkg VSUP leakage current VSUP = 10 V for high side, controller disabled,
TJ = 100°C		 1 2 µA
VSense2/3 Feedback voltage With respect to the 800-mV internal reference –1% 1%
COMP2/3HTH COMP2/3 Input threshold low 0.9 1.5 V
COMP2/3LTH COMP2/3 Input threshold high VREG – 1.2 VREG – 0.3 V
RTIEOFF COMP23 COMP2/3 internal tie-off BUCK2/3 enabled. Resistor to VREG and GND, each 70 100 130 kΩ
VDIO2 3 Bootstrap diode forward voltage IBOOT1 = –200 mA, VREG-BOOT2, VREG-BOOT3 1.1 1.2 V
BOOST CONVERTER
VBoost Boost adjustable output voltage range Using 3.3-V input voltage, Ieak_switch ≤ 1 A 4.5 15 V
VBoost Boost adjustable output voltage range Using 3.3-V input voltage Iloadmax = 20 mA,
Ipeak_switch = 0.3 A		 15 18.5 V
RDS-ON_BOOST Internal switch on-resistance VREG = 5.8 V 0.3 0.5 Ω
VSense5 Feedback voltage With respect to the 800-mV internal reference –1% 1%
ICLBOOST Internal switch current-limit 1 1.5 A
LINEAR REGULATOR LDO
VSUP4 Device operating range for LDO Recommended operating range 3 7 V
VLDO Regulated output range IOUT = 1 mA to 350 mA 0.8 5.25 V
VRefLDO DC output voltage tolerance at VSENSE4 VSENSE4 = 0.8 V (regulated at internal ref)
VSUP4 = 3 V to 7 V, IOUT = 1 mA to 350 mA		 –2% 2%
Vstep1 Load step 1 VSENSE4 = 0.8 V (regulated at internal ref)
IOUT = 1 mA to 101 mA,
CLDO = 6 to 50 µF, trise = 1 µs		 –2% 2%
VSense4 Feedback voltage With respect to the 800-mV internal reference –1% 1%
VDropout Drop out voltage IOUT = 350 mA, TJ = 25°C 127 143 mV
IOUT = 350 mA, TJ = 125°C 156 180
IOUT = 350 mA, TJ = 150°C 275 335
IOUT Output current VOUT in regulation –350 –1 mA
ILDO-CL Output current limit VOUT = 0 V, VSUP4 = 3 V to 7 V –1000 –400 mA
PSRRLDO Power supply ripple rejection Vripple = 0.5 VPP, IOUT = 300 mA,
CLDO = 10 µF		 Freq = 100 Hz 60 dB
Freq = 4 kHz 50
Freq = 150 kHz 25
LDOns10-100 Output noise 10 Hz – 100 Hz 10-µF output capacitance, VLDO = 2.5 V 20 µV/√(Hz)
LDOns100-1k Output noise 100 Hz – 10 kHz 10-µF output capacitance, VLDO = 2.5 V 6 µV/√(Hz)
CLDO Output capacitor Ceramic capacitor with ESR range, CLDO_ESR = 0 to 100 mΩ 6 50 µF
LED AND HIGH-SIDE SWITCH CONTROL
VHSSENSE Current sense voltage VINPROT – HSSENSE, high-side switch in current limit 370 400 430 mV
VCMHSSENSE Common mode range for current sensing See VINPROT 4 60 V
VHSOL_TH VINPROT – HSSENSE open load threshold Ramping negative 5 20 35 mV
Ramping positive 26 38 50
VHSOL_HY Open load hysteresis 10 18 28 mV
VHS SC VINPROT – HSSENSE load short detection threshold Ramping positive 88% 92.5% 96% VHSSENSE
Ramping negative from load short condition 87 90 93 % of VHSSENSE
VHSSC_HY VINPROT – HSSENSE short circuit hysteresis 1 % of VHSSENSE
VHSCTRLOFF Voltage at HSCTRL when OFF VINPROT
– 0.5		 VINPROT V
VGS Clamp voltage between HSSENSE – HSCTRL 6.1 7.7 8.5 V
VOS_HS Overshoot during turn-on VOS_HS = VINPROT - HSSENSE 400 mV
ICL_HSCTRL HSCTRL current-limit 2 4.1 5 mA
RPU_HSCTRL Internal pullup resistors Between VINPROT and HSCTRL 70 100 130 kΩ
RPU_HSCTRL-HSSENSE Between HSCTRL and HSSENSE 70 100 130
VI_high High level input voltage HSPWM, VIO = 3.3 V 2 V
VI_low Low level input voltage HSPWM, VIO = 3.3 V 0.8 V
VI_hys Input voltage hysteresis HSPWM, VIO = 3.3 V 150 500 mV
RSENSE External sense resistor Design info, no device parameter 1.5 50 Ω
CGS External MOSFET gate source capacitance 100 2000 pF
CGD External MOSFET gate drain capacitance 500 pF
REFERENCE VOLTAGE
VREF Reference voltage 3.3 V
VREF-tol Reference voltage tolerance IVREF = 5 mA –1% 1%
IREFCL Reference voltage current-limit 10 25 mA
CVREF Capacitive load 0.6 5 µF
REFns10-100 Output noise 10 Hz–100 Hz 2.2 µF output capacitance, IVREF = 5 mA 20 µV/√(Hz)
REFns100-1k Output noise 100 Hz–10 kHz 2.2 µF output capacitance, IVREF = 5 mA 6 µV/√(Hz)
VREF_OK Reference voltage OK threshold Threshold, VREF falling 2.91 3.07 3.12 V
Hysteresis 14 70 140 mV
SHUTDOWN COMPARATOR
VT_REF Shutdown comparator reference voltage IVT_REF = 20 µA. Measured as drop voltage with respect to VDVDD 10 17 500 mV
IVT_REF = 600 µA. Measured as drop voltage with respect to VDVDD. No VT_REF short-circuit detection. 200 420 1100
IVT_REFCL Shutdown comparator reference current limit VT_REF = 0 0.6 1 1.4 mA
VVT_REF SH VT_REF short circuit detection Threshold, VT_REF falling. Measured as drop voltage with respect to VDVDD 0.9 1.2 1.8 V
Hysteresis 130 mV
VTTH-H Input voltage threshold on VT, rising edge triggers shutdown This feature is specified by design to work down to –55°C. 0.48 0.50 0.52 VT_REF
VTTH-L Input voltage threshold on VT, falling voltage enables device operation This feature is specified by design to work down to –55°C. 0.46 0.48 0.52 VT_REF
VTTOL Threshold variation VTTH-H – VT_REF / 2, VTTH-L – VT_REF / 2 –20 20 mV
IVT_leak Leakage current TJ: –20°C to 125°C –400 –50 nA
TJ: –55°C to –20°C –200 –50
VT_REFOV VT_REF overvoltage threshold Threshold, VT_REF rising. Measured as drop voltage with respect to VDVDD 0.42 0.9 1.2 V
Hysteresis 100 mV
WAKE INPUT
VWAKE_ON Voltage threshold to enable device WAKE pin is a level sensitive input 3.3 3.7 V
VBAT UNDERVOLTAGE WARNING
VSSENSETH_L VSSENSE falling threshold low SPI selectable, default after reset 4.3 4.7 V
VSSENSETH_H VSSENSE falling threshold high SPI selectable 6.2 6.8 V
VSSENSE-HY VSSENSE hysteresis 0.2 V
IVSLEAK Leakage current at VSSENSE LPM0 mode, VSSENSE 55 V 1 µA
IVSLEAK60 Leakage current at VSSENSE LPM0 mode, VSSENSE 60 V 100 µA
IVSLEAK80 Leakage current at VSSENSE LPM0 mode, VSSENSE 80 V 5 25 mA
RVSSENSE Internal resistance from VSSENSE to GND VSSENSE = 14 V, disabled in LPM0 mode 0.7 1 1.3 MΩ
VIN OVERVOLTAGE PROTECTION
VOVTH_H VIN overvoltage shutdown threshold 1 (rising edge) Selectable with SPI 50 60 V
VOVTH_L VIN overvoltage shutdown threshold 2 (rising edge) Selectable with SPI, default after reset 36 38 V
VOVHY VIN overvoltage hysteresis Threshold 1 0.2 1.7 3 V
Threshold 2 - default after reset 1.5 2 2.5
WINDOW WATCHDOG
VI_high High level input voltage WD, VIO = 3.3 V 2 V
VI_low Low level input voltage WD, VIO = 3.3 V 0.8 V
VI_hys Input voltage hysteresis WD, VIO = 3.3 V 150 500 mV
RESET AND IRQ BLOCK
VRESL Low level output voltage at RESN, PRESN and IRQ VIN ≥ 3 V, IxRESN = 2.5 mA 0 0.4 V
VRESL Low level output voltage at RESN and PRESN VIN = 0 V, VIO = 1.2 V, IxRESN = 1 mA 0 0.4 V
IRESLeak Leakage current at RESN, PRESN and IRQ Vtest = 5.5 V 1 µA
NRES Number of consecutive reset events for transfer to LPM0 7
EXTERNAL PROTECTION
VCLAMP Gate to source clamp voltage VIN - GPFET, 100 µA 14 20 V
IGPFET Gate turn on current VIN = 14 V, GPFET = 2 V 15 25 µA
RDSONGFET Gate driver strength VIN = 14 V, turn off 25 Ω
THERMAL SHUTDOWN AND OVERTEMPERATURE PROTECTION
TSDTH Thermal shutdown Junction temperature 160 175 °C
TSDHY Hysteresis 20 °C
TOTTH Overtemperature flag Overtemperature flag is implemented as local temp sensors and expected to trigger before the thermal shutdown 150 165 °C
TOTHY Hysteresis 20 °C
VOLTAGE MONITORS BUCK1/2/3, VIO, LDO, BOOSTER
VMONTH_L Voltage monitor reference REF = 0.8 V – falling edge 90% 92% 94%
VMONTH_H Voltage monitor reference REF = 0.8 V – rising edge 106% 108% 110%
VMON_HY Voltage monitor hysteresis 2%
VVIOMON_TH Undervoltage monitoring at VIO – falling edge 3 3.13 V
VVIOMON_HY UV_VIO hysteresis 0.05 V
GND LOSS
VGLTH-low GND loss threshold low GND to PGNDx –0.31 –0.25 –0.19 V
VGLTH-high GND loss threshold high GND to PGNDx 0.19 0.25 0.31 V
INTERNAL VOLTAGE REGULATORS
VREG Internal regulated supply IVREG = 0 mA to 50 mA, VINPROT = 6.3 V to 40 V and EXTSUP = 6.3 V to 12 V 5.5 5.8 6.1 V
VEXTSUP-TH Switch over voltage IVREG = 0 mA to 50 mA and EXTSUP ramping positive, ACTIVE mode 4.4 4.6 4.8 V
VEXTSUP-HY Switch over hysteresis 100 200 300 mV
VREGDROP Drop out voltage on VREG IVREG = 50 mA,
EXTSUP = 5 V / VINPROT = 5 V and
EXTSUP = 0 V / VINPROT = 4 V 		200 mV
IREG_CL Current limit on VREG EXTSUP = 0 V, VREG = 0 V –250 –50 mA
IREG_EXTSUP_CL EXTSUP ≥ 4.8 V, VREG = 0 V –250 –50 mA
CVREG Capacitive load 1.2 2.2 3.3 µF
VREG-OK VREG undervoltage threshold VREG rising 3.8 4 4.2 V
Hysteresis 350 420 490 mV
VDVDD Internal regulated low voltage supply 3.15 3.3 3.45 V
VDVDD UV DVDD undervoltage threshold DVDD falling 2.1 V
VDVDD OV DVDD overvoltage threshold DVDD rising 3.8 V
SPI
VI_high High level input voltage CSN, SCK, SDI; VIO = 3.3 V 2 V
VI_low Low level input voltage CSN, SCK, SDI; VIO = 3.3 V 0.8 V
VI_hys Input voltage hysteresis CSN, SCK, SDI; VIO = 3.3 V 150 500 mV
VO_high SDO output high voltage VIO = 3.3 V ISDO = 1 mA 3 V
VO_low SDO output low voltage VIO = 3.3 V ISDO = 1 mA 0.2 V
CSDO SDO capacitance 50 pF
GLOBAL PARAMETERS
RPU Internal pullup resistor at CSN pin 70 100 130 kΩ
RPD Internal pulldown resistor at pins: HSPWM , SDI, SCK, WD, S2(5) 70 100 130 kΩ
RPD-WAKE Internal pulldown resistor at WAKE pin 140 200 260 kΩ
ILKG Input pullup current at pins:
- VSENSE1–5
- VMON1–3 		VTEST = 0.8 V –200 –100 –50 nA
(1) TA = 25°C
(2) TA = 130°C
(3) Quiescent Current Specification does not include the current flow through the external feedback resistor divider. Quiescent Current is non-switching current, measured with no load on the output with VBAT = 13 V.
(4) Total current consumption measured on EVM includes switching losses.
(5) RAMP and ACTIVE only

7.6 Timing Requirements

MIN TYP MAX UNIT
BUCK CONTROLLER (BUCK1)
tOCBUCK1_BLK RSTN and ERROR mode transition, when over current detected for > tOCBUCK1_BLK 1 ms
LED AND HIGH-SIDE SWITCH CONTROL
tHSOL_BLK Open load blanking time 70 100 140 µs
tHSS CL Net time in current limit to disable driver 4 5 6 ms
tS HS Current-limit sampling interval 100 µs
tON Turnon time Time from rising HSPWM till high-side switch in current limitation, ±5% settling 30 µs
Time from rising HSPWM till high-side switch till voltage-clamp between HSSENSE – HSCTRL active (within VGS limits) 30 60 µs
fHS_IN HSPWM input frequency Design information, no device parameter 100 500 Hz
REFERENCE VOLTAGE
TREF_OK Reference voltage OK deglitch time 10 20 µs
SHUTDOWN COMPARATOR
TVT_REF_FLT VT_REF fault deglitch time Overvoltage or short condition on VT_REF 10 20 µs
WAKE INPUT
tWAKE Min. pulse width at WAKE to enable device VWAKE = 4 V to suppress short spikes at WAKE pin 10 20 µs
VBAT UNDERVOLTAGE WARNING
tVSSENSE_BLK Blanking time VVSENSE < VSSENSETH_xx → IRQ asserted 10 35 µs
VIN OVERVOLTAGE PROTECTION
tOFF BLK-H OV delay time VIN > VOVTH_H → GPFET off 1 µs
tOFF BLK-L OV blanking time VIN > VOVTH_L → GPFET off 10 20 µs
WINDOW WATCHDOG
ttimeout Timeout TESTSTART, TESTSTOP, VTCHECK , and RAMP mode:
Starts after entering each mode.
ACTIVE mode:
WD timeout starts with rising edge of RESN		 230 300 370 ms
tWD Watchdog window time Spread spectrum disabled 18 20 22 ms
Spread spectrum enable 19.8 22 24.2
tWD_FAIL Closed window time tWD / 4
tWD_BLK WD filter time 1.2 µs
RESET AND IRQ BLOCK
tRESNHOLD RESN hold time 1.8 2 2.2 ms
tIRQHOLD IRQ hold time After VVSENSE < VSSENSETH for tVSSENSE_BLK 10 20 µs
tDR IRQ PRESN Rising edge delay of IRQ to rising edge of PRESN 2 µs
tDF RESN_PRESN Falling edge delay of RESN to PRESN / IRQ 2 µs
THERMAL SHUTDOWN AND OVERTEMPERATURE PROTECTION
tSD-BLK Blanking time before thermal shutdown 10 20 µs
tOT_BLK Blanking time before thermal over temperature 10 20 µs
VOLTAGE MONITORS BUCK1/2/3, VIO, LDO, BOOSTER
tVMON_BLK Blanking time between UV/OV condition to RESN low UV/OV: BUCK1/2/3 UV: VIO 10 20 µs
tVMONTHL_BLK Blanking time between undervoltage condition to ERROR mode transition or corresponding SPI bit BUCK1/2/3 → ERROR mode LDO or BOOST → SPI bit set or turn off 1 ms
tVMONTHL_BLK1 Blanking time between undervoltage condition to ERROR mode transition VIO only 10 20 µs
tVMONTHH_BLK1 Blanking time between overvoltage condition to ERROR mode transition BUCK1/2/3 → ERROR mode VIO has no OV protection 10 20 µs
tVMONTHH_BLK2 Blanking time LDO and BOOST overvoltage condition to corresponding SPI bit or ERROR mode LDO or BOOST (ACTIVE mode) → SPI bit set or turn off LDO (VTCHECK or RAMP mode) → ERROR mode 20 40 µs
GND LOSS
tGL-BLK Blanking time between GND loss condition and transition to ERROR state 5 20 µs
POWER-UP SEQUENCING
tSTART1 Soft start time of BOOST From start till exceeding VMONTH_L + VMON_HY Level 0.7 2.7 ms
tSTART2 Soft start time of BUCK1/2/3 and LDO From start till exceeding VMONTH_L + VMON_HY Level 0.5 2 ms
tSTART Startup DVDD regulator From start till exceeding VMONTH_L + VMON_HY Level 3 ms
tSEQ2 Sequencing time from start of BUCK1 to BUCK2 and BOOST Internal SSDONE_BUCK1 signal 3 ms
tWAKE-RES Startup time from entering TESTSTART to RESN high GPFET = IRFR6215 14 ms
tSEQ1 Sequencing time from start of BOOST to BUCK3 Internal SSDONE_BOOST signal 1 4 ms
INTERNAL VOLTAGE REGULATORS
tDVDD OV Blanking time from DVDD overvoltage condition to shutdown mode transition 10 20 µs
SPI INTERFACE
tSPI SCK period See Figure 1 240 ns
tSCKL SCK low time 100 ns
tSCKH SCK high time 100 ns
tFSIV Time between falling edge of CSN and SDO output valid (FSI bit) Falling SDO < 0.8 V; Rising SDO > 2 V, See Figure 1 80 ns
tSDOV Time between rising edge of SCK and SDO data valid Falling SDO < 0.8 V; Rising SDO > 2 V, See Figure 1 55 ns
tSDIS Setup time of SDI before falling edge of SCK See Figure 1 20 ns
tSDOH Hold time of SDO after rising edge of SCK 5 ns
tHCS Hold time of CSN after last falling edge of SCK See Figure 1 50 ns
tSDOtri Delay between rising edge of CSN and SDO 3-state 80 ns
tmin2SPI Minimum time between two SPI commands 10 µs

7.7 Switching Characteristics

over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
BUCK CONTROLLER (BUCK1)
fSWBUCK1 Switching frequency fOSC / 10
DC Duty cycle High-side minimum on time 100 ns
Maximum duty cycle 98.75%
tDEAD_BUCK1 Shoot-through delay, blanking time 25 ns
SYNCHRONOUS BUCK CONVERTER BUCK2/3
fSWLBuck2/3 Buck switching frequency fOSC / 2
DCBUCK2/3 Duty cycle High-side minimum on time 50 ns
Maximum duty cycle 99.8%
tDEAD_BUCK2/3 Shoot-through delay 20 ns
BOOST CONVERTER
fSWLBOOST Boost switching frequency fOSC / 2
DCBOOST Maximum internal MOSFET duty cycle at fSWLBOOST 75%
GLOBAL PARAMETERS
fOSC Internal oscillator used for Buck or Boost switching frequency 4.6 4.9 5.2 MHz
fspread Spread spectrum frequency range 0.8 × fOSC fOSC
TPS65311-Q1 fig001_SPI_tim_SLVSC15.gif Figure 1. SPI Timing

7.8 Typical Characteristics

All parameters are measured on a TI EVM, unless otherwise specified.

7.8.1 BUCK 1 Characteristics

TPS65311-Q1 Buck1_Char_1.gif
Figure 2. Reduction of Current-Limit vs Duty Cycle

7.8.2 BUCK 2 and BUCK3 Characteristics

TPS65311-Q1 g2_buck_23_Char_7_slvsca6.gif
Figure 3. Load Regulation BUCK2 = 3.3 V
EXTSUP Pin Open
TPS65311-Q1 g3_Buck_23_Char_8_slvsca6.gif
Figure 4. Load Regulation BUCK3 = 1.2 V
EXTSUP Pin Open
TPS65311-Q1 g4_Buck_23_Char_9_slvsca6.gif
Figure 5. Open-Load Line Regulation BUCK2 = 3.3 V
EXTSUP Pin Open
TPS65311-Q1 g6_Buck_23_Char_11_slvsca6.gif
Figure 7. Open-Load Supply Current BUCK2 = 3.3 V
EXTSUP Pin Open
TPS65311-Q1 g8_Buck_23_Char_13_slvsca6.gif
Figure 9. BUCK2 = 3.3-V VSENSE2 vs Temperature
EXTSUP Pin Open
TPS65311-Q1 g5_Buck_23_Char_10_slvsca6.gif
Figure 6. Open-Load Line Regulation BUCK3 = 1.2 V
EXTSUP Pin Open
TPS65311-Q1 g7_Buck_23_Char_12_slvsca6.gif
Figure 8. Open-Load Supply Current BUCK3 = 1.2 V
EXTSUP Pin Open
TPS65311-Q1 g9_Buck_23_Char_14_slvsca6.gif
Figure 10. BUCK3 = 1.2-V VSENSE3 vs Temperature
EXTSUP Pin Open

7.8.3 BOOST Characteristics

TPS65311-Q1 g10_BOOST_Char_3_slvsca6.gif Figure 11. Open-Load Line Regulation BOOST = 5 V, AT 25°C, EXTSUP Pin Open, BOOST Supply Input = 3.8 V
TPS65311-Q1 g12_BOOST_Char_5_slvsca6.gif Figure 13. BOOST = 5-V VSENSE5 vs Temperature
EXTSUP Pin Open, Input Supply = 3.8-V, 0.4-A Load
TPS65311-Q1 g11_BOOST_Char_4_slvsca6.gif Figure 12. Load Regulation BOOST = 5 V AT 25°C
EXTSUP Pin Open, BOOST Supply Input = 3.8 V

7.8.4 LDO Noise Characteristics

(2 × 3.3-µF output capacitance, LDO output = 2.5 V, VSUP4 = 3.8 V)

TPS65311-Q1 graph_ldo_noise_slvsca6.gif Figure 14. LDO Noise Density