SLUSBN5B August   2013  – July 2015 TPS53515


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  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. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  5-V LDO and VREG Start-Up
      2. 7.3.2  Enable, Soft Start, and Mode Selection
      3. 7.3.3  Frequency Selection
      4. 7.3.4  D-CAP3 Control and Mode Selection
        1. D-CAP3 Mode
        2. Sample and Hold Circuitry
        3. Adaptive Zero-Crossing
      5. 7.3.5  Power-Good
      6. 7.3.6  Current Sense and Overcurrent Protection
      7. 7.3.7  Overvoltage and Undervoltage Protection
      8. 7.3.8  Out-of-Bounds Operation
      9. 7.3.9  UVLO Protection
      10. 7.3.10 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Auto-Skip Eco-mode Light Load Operation
      2. 7.4.2 Forced Continuous-Conduction Mode
  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. Choose the Switching Frequency
        2. Choose the Operation Mode
        3. Choose the Inductor
        4. Choose the Output Capacitor
        5. Determine the Value of R1 and R2
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Performance
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 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

RVE Package
Top View
TPS53515 pinout_rve28_slusbn5.gif

Pin Functions

DNC 26 O Do not connect. This pin is the output of unused internal circuitry and must be floating.
EN 3 I The enable pin turns on the DC-DC switching converter.
FB 23 I VOUT feedback input. Connect this pin to a resistor divider between the VOUT pin and GND.
GND 22 G This pin is the ground of internal analog circuitry and driver circuitry. Connect GND to the PGND plane with a short trace (For example, connect this pin to the thermal pad with a single trace and connect the thermal pad to PGND pins and PGND plane).
GND1 27 I Connect this pin to ground. GND1 is the input of unused internal circuitry and must connect to ground.
GND2 28 I Connect this pin to ground. GND2 is the input of unused internal circuitry and must connect to ground.
MODE 21 I The MODE pin sets the forced continuous-conduction mode (FCCM) or Skip-mode operation. It also selects the ramp coefficient of D-CAP3 mode.
NC 5 Not connected. These pins are floating internally.
PGND 10 G These ground pins are connected to the return of the internal low-side MOSFET.
PGOOD 2 O Open-drain power-good status signal which provides startup delay after the FB voltage falls within the specified limits. After the FB voltage moves outside the specified limits, PGOOD goes low within 2 µs.
RF 1 I RF is the SW-frequency configuration pin. Connect this pin to a resistor divider between VREG and GND to program different SW frequency settings.
SW 6 I/O SW is the output switching terminal of the power converter. Connect this pin to the output inductor.
TRIP 25 I/O TRIP is the OCL detection threshold setting pin. ITRIP = 10 µA at room temp, 3000 ppm/°C current is sourced and sets the OCL trip voltage. See the Current Sense and Overcurrent Protection section for detailed OCP setting.
VBST 4 P VBST is the supply rail for the high-side gate driver (boost terminal). Connect the bootstrap capacitor from this pin to the SW node. Internally connected to VREG via bootstrap PMOS switch.
VDD 19 P Power-supply input pin for controller. Input of the VREG LDO. The input range is from 4.5 to 25 V.
VIN 15 P VIN is the conversion power-supply input pins.
VREG 20 O VREG is the 5-V LDO output. This voltage supplies the internal circuitry and gate driver.
VO 24 I VOUT voltage input to the controller.
(1) I = Input, O = Output, P = Supply, G = Ground