SLVS616C November   2005  – December 2014 TPS51124

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 Recommended Operating Conditions
    3. 6.3 Thermal Information
    4. 6.4 Electrical Characteristics
    5. 6.5 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 Operation
      2. 7.3.2  Light-Load Condition
      3. 7.3.3  Low-Side Driver
      4. 7.3.4  High-Side Driver
      5. 7.3.5  PWM Frequency and Adaptive On-Time Control
      6. 7.3.6  Powergood
      7. 7.3.7  Output Discharge Control
      8. 7.3.8  Current Protection
      9. 7.3.9  Over and Undervoltage Protection
      10. 7.3.10 UVLO Protection
      11. 7.3.11 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
      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 Third-Party Products Disclaimer
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Pin Configuration and Functions

RGE Package
24-Pin VQFN With Exposed Thermal Pad
Top View
po_lvs616.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
DRVH1 21 O Synchronous high-side MOSFET driver outputs. LL node referenced floating drivers. The gate drive voltage is defined by the voltage across VBST to LL node flying capacitor.
DRVH2 10
DRVL1 19 O Synchronous low-side MOSFET driver outputs. PGND referenced drivers. The gate-drive voltage is defined by V5IN voltage.
DRVL2 12
EN1 23 I Channel 1 and channel 2 enable pins. Connect to 5 V or 3.3 V to turn on SMPS
EN2 8
GND 3 I Signal ground pin
LL1 20 I/O Switch node connections for high-side drivers return. Also serve as input to current comparators and input voltage monitor for on-time control circuitry.
LL2 11
PGND1 18 I/O Ground returns for DRVL1 and DRVL2. Also serve as input of current comparators. Connect PGND1, PGND2, and GND strongly together near the IC. Output discharge current flows through this pin, also.
PGND2 13
PGOOD1 24 O Power Good window comparator open drain output for channel 1 and 2. Pull up with a resistor to 5 V, or appropriate signal voltage. Current capability is 5 mA. PGOOD goes high 0.5 ms after VFB comes within specified limits. Power bad, or the terminal goes low, is within 10 μs.
PGOOD2 7
TONSEL 4 I On-time selection pin. See Table 1.
TRIP1 17 I Overcurrent trip point set input. Connect resistor from this pin to GND to set threshold for synchronous low-side RDS(on) sense. Voltage across this pin and GND is compared to voltage across PGND and LL at over-current comparator.
TRIP2 14
VBST1 22 I Supply input for synchronous high-side MOSFET driver (Boost Terminal). Connect capacitor from this pin to respective LL terminals. An internal PN diode is connected between V5IN to each of these pins. User can add external Schottky diode if forward drop is critical to drive the MOSFET.
VBST2 9
VFB1 2 I SMPS voltage feedback inputs. Connect with feedback resistor divider.
VFB2 5
VO1 1 I Output connections to SMPS. These terminals serve two functions: On-time adjustment and output discharge.
VO2 6
V5FILT 15 I 5-V power supply input for the entire control circuit except the MOSFET drivers. Connect RC low-pass filter from V5IN to V5FILT.
V5IN 16 I 5-V power supply input for FET gate drivers. Internally connected to VBSTx by PN diodes.