SLUS786H OCTOBER   2007  – January 2015 TPS51125

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  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  PWM Operations
      2. 7.3.2  Adaptive On-Time Control and PWM Frequency
      3. 7.3.3  Loop Compensation
      4. 7.3.4  Ramp Signal
      5. 7.3.5  Light-Load Condition in Auto-Skip Operation
      6. 7.3.6  Out-of-Audio Light-Load Operation
      7. 7.3.7  VREG5/VREG3 Linear Regulators
      8. 7.3.8  VREG5 Switch Over
      9. 7.3.9  VREG3 Switch Over
      10. 7.3.10 Powergood
      11. 7.3.11 Output Discharge Control
      12. 7.3.12 Low-Side Driver
      13. 7.3.13 High-Side Driver
      14. 7.3.14 VCLK for Charge Pump
      15. 7.3.15 Current Protection
      16. 7.3.16 Overvoltage and Undervoltage Protection
      17. 7.3.17 UVLO Protection
      18. 7.3.18 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable and Soft-Start
  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 Determine Output Voltage
        2. 8.2.2.2 Choose the Inductor
        3. 8.2.2.3 Choose the Output Capacitors
        4. 8.2.2.4 Choose the Low-Side MOSFET
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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机械数据 (封装 | 引脚)
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订购信息

5 Pin Configuration and Functions

RGE PACKAGE
24 PINS
TOP VIEW
pin_lus786.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
DRVH1 21 O High-side N-channel MOSFET driver outputs. LL referenced drivers.
DRVH2 10
DRVL1 19 O Low-side N-channel MOSFET driver outputs. GND referenced drivers.
DRVL2 12
ENTRIP1 1 I/O Channel 1 and Channel 2 enable and OCL trip setting pins.Connect resistor from this pin to GND to set threshold for synchronous RDS(on) sense. Short to ground to shutdown a switcher channel.
ENTRIP2 6
EN0 13 I/O

Master enable input.

Open : LDOs on, and ready to turn on VCLK and switcher channels.

620 kΩ to GND : enable both LDOs, VCLK off and ready to turn on switcher channels. Power consumption is almost the same as the case of VCLK = ON.

GND : disable all circuit
GND 15 — Ground.
LL1 20 I Switch node connections for high-side drivers, current limit and control circuitry.
LL2 11
PGOOD 23 O Power Good window comparator output for channel 1 and 2. (Logical AND)
SKIPSEL 14 I

Selection pin for operation mode:

OOA auto skip : Connect to VREG3 or VREG5

Auto skip : Connect to VREF

Auto skip : Connect to VREF
TONSEL 4 I

On-time adjustment pin

365 kHz/460 kHz setting : connect to VREG5

300 kHz/375 kHz setting : connect to VREG3

245 kHz/305 kHz setting : connect to VREF

200 kHz/250 kHz setting : connect to GND
VBST1 22 I Supply input for high-side N-channel MOSFET driver (boost terminal).
VBST2 9
VCLK 18 O 270-kHz clock output for 15-V charge pump.
VFB1 2 I SMPS feedback inputs. Connect with feedback resistor divider.
VFB2 5
VIN 16 I High voltage power supply input for 5-V/3.3-V LDO.
VO1 24 I/O Output connection to SMPS. These terminals work as fixed voltage inputs and output discharge inputs. VO1 and VO2 also work as 5 V and 3.3 V switch over return power input respectively.
VO2 7
VREF 3 O 2-V reference voltage output. Connect 220-nF to 1-μF ceramic capacitor to Signal GND near the device.
VREG3 8 O 3.3-V power supply output. Connect 10-μF ceramic capacitor to Power GND near the device. A 1-μF ceramic capacitor is acceptable when not loaded.
VREG5 17 O 5-V power supply output. Connect 33-μF ceramic capacitor to Power GND near the device.