ZHCS124C MARCH   2011  – January 2015 TPS56221

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用范围
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Voltage Reference
      2. 7.3.2  Enable Functionality, Start-Up, Sequence, and Timing
        1. 7.3.2.1 COMP Pin Impedance Sensing
        2. 7.3.2.2 Overcurrent Protection (OCP) Setting
      3. 7.3.3  Soft-Start Time
      4. 7.3.4  Oscillator
      5. 7.3.5  Overcurrent Protection (OCP)
      6. 7.3.6  Switching Node (SW)
      7. 7.3.7  Input Undervoltage Lockout (UVLO)
      8. 7.3.8  Prebias Start-Up
      9. 7.3.9  Power Good
      10. 7.3.10 Thermal Shutdown
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Switching Frequency Selection
        2. 8.2.2.2  Inductor Selection
        3. 8.2.2.3  Output Capacitor Selection
        4. 8.2.2.4  Inductor Peak Current Rating
        5. 8.2.2.5  Input Capacitor Selection
        6. 8.2.2.6  Boot-Strap Capacitor (C14)
        7. 8.2.2.7  Boot-Strap Resistor (R2)
          1. 8.2.2.7.1 RC Snubber (R9 and C18)
        8. 8.2.2.8  VDD Bypass Capacitor (C11)
        9. 8.2.2.9  BP5 Bypass Capacitor (C12)
        10. 8.2.2.10 Soft-Start Capacitor (C13)
        11. 8.2.2.11 Current Limit (R1)
        12. 8.2.2.12 Feedback Divider (R4, R7)
        13. 8.2.2.13 Compensation (C15, C16, C17, R3, R6)
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 第三方产品免责声明
    2. 11.2 商标
    3. 11.3 静电放电警告
    4. 11.4 术语表
  12. 12机械、封装和可订购信息

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • DQP|22
散热焊盘机械数据 (封装 | 引脚)
订购信息

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)
MIN MAX UNIT
Voltage VDD, VIN –0.3 16.5 V
SW –3 25
SW (< 100 ns pulse width, 10 µJ) –5
BOOT –0.3 30
BOOT-SW (differential from BOOT to SW) –0.3 7
COMP, PGOOD, FB, BP, EN/SS, ILIM –0.3 7
Junction Temperature, TJ –40 150 °C
Storage temperature, Tstg –55 150 °C
(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 condition beyond those included under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods of time may affect device reliability.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1500
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
VDD VIN Input voltage 4.5 14 V
TJ Operating junction temperature –40 125 °C

6.4 Thermal Information

THERMAL METRIC(1) TPS56221 UNIT
PQFN
22 PINS
RθJA Junction-to-ambient thermal resistance 34.6 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 22.9
ψJT Junction-to-top characterization parameter 0.6
ψJB Junction-to-board characterization parameter 5.0
RθJC(bot) Junction-to-case (bottom) thermal resistance 0.3
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

–40°C ≤ TJ ≤ 125°C, VVDD = 12 V, all parameters at zero power dissipation (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VOLTAGE REFERENCE
VFB FB input voltage TJ = 25°C, 4.5 V ≤ VVDD ≤ 14 V 597 600 603 mV
–40°C ≤ TJ ≤ 125°C,
4.5 V ≤ VVDD ≤ 14 V		 594 600 606
INPUT SUPPLY
VVDD Input supply voltage range 4.5 14 V
IVDDSD Shutdown supply current VEN/SS = 0.2 V 80 120 µA
IVDDQ Quiescent, nonswitching Let EN/SS float, VFB = 1 V 2.5 5.0 mA
VUVLO UVLO ON Voltage 4.0 4.3 V
VUVLO(HYS) UVLO hysteresis 500 700 mV
ENABLE/SOFT-START
VIH High-level input voltage, EN/SS 0.55 0.70 1.00 V
VIL Low-level input voltage, EN/SS 0.27 0.30 0.33 V
ISS Soft-start source current 8 10 12 µA
VSS Soft-start voltage level – start of ramp 0.4 0.8 1.3 V
BP REGULATOR
VBP Output voltage IBP = 10 mA 6.2 6.5 6.8 V
VDO Regulator dropout voltage, VVDD – VBP IBP = 25 mA, VVDD = 4.5 V 70 125 mV
OSCILLATOR
fSW Switching frequency RCOMP = 40.2 kΩ,
4.5 V ≤ VVDD ≤ 14 V		 270 300 330 kHz
RCOMP = open,
4.5 V ≤ VVDD ≤ 14 V		 450 500 550 kHz
RCOMP = 13.3 kΩ,
4.5 V ≤ VVDD ≤ 14 V		 0.8 0.95 1.1 MHz
VRAMP(1) Ramp amplitude VVDD/6.6 VVDD/6 VVDD/5.4 V
PWM
DMAX(1) Maximum duty cycle fsw = 300 kHz, VFB = 0 V,
4.5 V ≤ VVDD ≤ 14 V		 93%
fsw = 500 kHz, VFB = 0 V,
4.5 V ≤ VVDD ≤ 14 V		 90%
fsw = 1 MHz, VFB = 0 V,
4.5 V ≤ VVDD ≤ 14 V		 85%
tON(min)(1) Minimum controllable pulse width 100 ns
ERROR AMPLIFIER
GBWP (1) Gain bandwidth product 10 24 MHz
AOL (1) Open loop gain 60 dB
IIB Input bias current (current out of FB pin) VFB = 0.6 V 75 nA
IEAOP Output source current VFB = 0 V 1.5 mA
IEAOM Output sink current VFB = 1 V 1.5 mA
POWER GOOD
VOV Feedback upper voltage limit for PGOOD 655 675 700 mV
VUV Feedback lower voltage limit for PGOOD 500 525 550 mV
VPGD-HYST PGOOD hysteresis voltage at FB 30 45 mV
RPGD PGOOD pull down resistance VFB = 0 V, IFB = 5 mA 30 70 Ω
IPGDLK PGOOD leakage current 550 mV < VFB < 655 mV,
VPGOOD = 5 V		 10 20 µA
OUTPUT STAGE
RHI High-side device resistance TJ = 25°C, (VBOOT– VSW) = 5.5 V 4.5 6.5 mΩ
RLO Low side device resistance TJ = 25°C 1.9 2.7 mΩ
OVERCURRENT PROTECTION (OCP)
tPSSC(min)(1) Minimum pulse time during short circuit 250 ns
tBLNKH(1) Switch leading-edge blanking pulse time (high-side detection) 150
IOCH OC threshold for high-side FET TJ = 25°C, (VBOOT– VSW) = 5.5 V 45 54 65 A
IILIM ILIM current source TJ = 25°C 10.0 µA
VOCLPRO(1) Programmable OC range for low side FET TJ = 25°C 12 100 mV
tOFF OC retry cycles on EN/SS pin 4 Cycle
BOOT DIODE
VDFWD Bootstrap diode forward voltage IBOOT = 5 mA 0.8 V
THERMAL SHUTDOWN
TJSD(1) Junction shutdown temperature 145 ºC
TJSDH(1) Hysteresis 20 ºC
(1) Ensured by design. Not production tested

6.6 Typical Characteristics

Figure 13 to Figure 18 are measured on a 2.5 inch × 2.5 inch, 0.062 inch thick FR4 board with 4 layers and 2-oz. copper, a 0.32-µH output inductor and a DCR of 0.32 mΩ.
TPS56221 vref01_lusah5.pngFigure 1. Reference Voltage vs. Junction Temperature
TPS56221 fsw500kHz_lusah5.pngFigure 3. Switching Frequency vs. Junction Temperature (500 kHz)
TPS56221 envih_lusah5.pngFigure 5. EN Pin High-Level Threshold Voltage vs. Junction Temperature
TPS56221 ivddsd07_lusah5.pngFigure 7. Shutdown Current vs. Junction Temperature
TPS56221 iss09_lusah5.pngFigure 9. Soft-Start Source vs. Junction Temperature
TPS56221 rhi11_lusah5.pngFigure 11. High-Side On Resistance vs. Junction Temperature
TPS56221 highoc13_lusah5.pngFigure 13. High-Side Overcurrent Threshold vs. Junction Temperature
TPS56221 eff12v15_lusah5.pngFigure 15. Efficiency vs. Load Current (VVIN = 12 V)
TPS56221 soa12v_lusah5.pngFigure 17. Output Current vs. Ambient Temperature
(VVIN = 12 V)
TPS56221 fsw300kHz_lusah5.pngFigure 2. Switching Frequency vs. Junction Temperature (300 kHz)
TPS56221 fsw1MHz_lusah5.pngFigure 4. Switching Frequency vs. Junction Temperature (1 MHz)
TPS56221 envil_lusah5.pngFigure 6. EN Pin Low-Level Threshold Voltage vs. Junction Temperature
TPS56221 ivddq08_lusah5.pngFigure 8. Quiescent Current vs. Junction Temperature
TPS56221 vss10_lusah5.pngFigure 10. Soft-Start Voltage Level vs. Junction Temperature
TPS56221 rli12_lusah5.pngFigure 12. Low-Side On Resistance vs. Junction Temperature
TPS56221 pg14_lusah5.pngFigure 14. Power Good Threshold Voltage vs. Junction Temperature
TPS56221 eff05v16_lusah5.pngFigure 16. Efficiency vs. Load Current (VVIN = 5 V)
TPS56221 soa05v_lusah5.pngFigure 18. Output Current vs. Ambient Temperature
(VVIN = 5 V)