SNVSA76B March   2015  – March 2017 TPS61177A

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 I2C Timing Requirements
    7. 6.7 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  Supply Voltage
      2. 7.3.2  Boost Regulator
      3. 7.3.3  Programmable Switch Frequency and Slew Rate
      4. 7.3.4  LED Current Sinks
      5. 7.3.5  Enable and Start-Up Timing
      6. 7.3.6  Input Undervoltage Protection (UVLO)
      7. 7.3.7  Overvoltage Protection (OVP)
      8. 7.3.8  Current-Sink Open Protection
      9. 7.3.9  Overcurrent Protection
      10. 7.3.10 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Mode Selection
      2. 7.4.2 Analog and PWM Mixed Dimming Mode
      3. 7.4.3 Analog Dimming Mode
      4. 7.4.4 Direct PWM Dimming
    5. 7.5 Programming
      1. 7.5.1 Configuration Parameters
    6. 7.6 Register Maps
      1. 7.6.1  MODE (A0h)
      2. 7.6.2  CS (A1h)
      3. 7.6.3  UVLO (A2h)
      4. 7.6.4  FREQ (A3h)
      5. 7.6.5  SR (A4h)
      6. 7.6.6  ILIM (A5h)
      7. 7.6.7  Control (FFh)
      8. 7.6.8  Example - Writing to a Single RAM Register
      9. 7.6.9  Example - Writing to Multiple RAM Registers
      10. 7.6.10 Example - Saving Contents of all RAM Registers to E2PROM
      11. 7.6.11 Example - Reading from a Single RAM Register
      12. 7.6.12 Example - Reading from a Single E2PROM Register
      13. 7.6.13 Example - Reading from Multiple RAM Registers
      14. 7.6.14 Example - Reading from Multiple E2PROM Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 CS Pin Unused
      2. 8.1.2 Brightness Dimming Control
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Inductor Selection
        2. 8.2.2.2 Output Capacitor Selection
      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 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

RGR Package
20-Pin VQFN
Top View
TPS61177A pin2_snvsa76.png

Pin Functions

PIN TYPE DESCRIPTION
NAME NUMBER
AGND 5, 9 — Signal ground of the device.
CS1, CS2, CS3, CS4, CS5, CS6 6, 7, 8, 10, 11, 12 I Current sink regulation inputs. They are connected to the cathode of WLEDs. The PWM loop regulates the lowest VCS to 500 mV. Each channel is limited to 30-mA current. Connect any unused CS pin to AGND or leave it open.
ENB 19 I Enable pin
LXB 16, 17 I Drain connection of the internal PWM switch MOSFET and external Schottky diode.
REF 4 O The reference pin for internal error amplifier. Connect a 470-nF ceramic capacitor to REF.
PGND 15 — Power ground of the IC. Internally, it connects to the source of the PWM switch. Tie the ground of power stage components to this ground.
PWMB 20 I Dimming control logic input. The dimming frequency range is from 100 Hz to 25 kHz.
SCL 2 I Clock input for I2C interface
SDA 1 I/O Data input for I2C interface
VCC 3 I Internal pre-regulator and supply rail for the internal logic. Do not connect any capacitor to VCC pin.
VINB 18 I Power supply to the IC
VLED 14 I The voltage detect pin for VOUT.