SLUS891B February   2010  – November 2014

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 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 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  Battery Voltage Regulation
      2. 7.3.2  Battery Current Regulation
      3. 7.3.3  Precharge
      4. 7.3.4  Charge Termination, Recharge, and Safety Timer
      5. 7.3.5  Power Up
      6. 7.3.6  Enable and Disable Charging
      7. 7.3.7  Automatic Internal Soft-Start Charger Current
      8. 7.3.8  Cycle-by-Cycle Charge Undercurrent Protection
      9. 7.3.9  Input Overvoltage Protection (ACOV)
      10. 7.3.10 Input Undervoltage Lock-Out (UVLO)
      11. 7.3.11 Battery Overvoltage Protection
      12. 7.3.12 Cycle-by-Cycle Charge Overcurrent Protection
      13. 7.3.13 Thermal Shutdown Protection
      14. 7.3.14 Temperature Qualification
      15. 7.3.15 Timer Fault Recovery
      16. 7.3.16 PG Output
      17. 7.3.17 CE (Charge Enable)
      18. 7.3.18 Inductor, Capacitor, and Sense Resistor Selection Guidelines
      19. 7.3.19 Charge Status Outputs
      20. 7.3.20 Battery Detection
        1. 7.3.20.1 Example
    4. 7.4 Device Functional Modes
      1. 7.4.1 Converter Operation
      2. 7.4.2 Synchronous and Non-Synchronous Operation
    5. 7.5 Application Information
    6. 7.6 Typical Application
      1. 7.6.1 Design Requirements
      2. 7.6.2 Detailed Design Procedure
        1. 7.6.2.1 Inductor Selection
        2. 7.6.2.2 Input Capacitor
        3. 7.6.2.3 Output Capacitor
        4. 7.6.2.4 Power MOSFET Selection
        5. 7.6.2.5 Input Filter Design
      3. 7.6.3 Application Curves
  8. 8 Power Supply Recommendations
  9. 9  Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Trademarks
    2. 10.2 Third-Party Products Disclaimer
    3. 10.3 Electrostatic Discharge Caution
    4. 10.4 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

5 Pin Configuration and Functions

RVA Package
(Top View)
po_lus891.gif

Pin Functions

PIN I/O FUNCTION DESCRIPTION
NAME NO.
VCC 1 I IC power positive supply. Connect, through a 10-Ω resistor to the common-source (diode-OR) point: source of high-side P-channel MOSFET and source of reverse-blocking power P-channel MOSFET. Or connect through a 10-Ω resistor to the cathode of the input diode. Place a 1-μF ceramic capacitor from VCC to the GND pin close to the IC.
CE 2 I Charge-enable active-HIGH logic input. HI enables charge. LO disables charge. It has an internal 1MΩ pull-down resistor.
STAT 3 I Open-drain charge status pin to indicate various charger operation (See Table 2)
TS 4 I Temperature qualification voltage input for battery pack negative temperature coefficient thermistor. Program the hot and cold temperature window with a resistor divider from VREF to TS to GND.
PG 5 O Open-drain power-good status output. The transistor turns on when a valid VCC is detected. It is turned off in the sleep mode. PG can be used to drive an LED or communicate with a host processor. It can be used to drive ACFET and BATFET.
VREF 6 O 3.3-V regulated voltage output. Place a 1-μF ceramic capacitor from VREF to the GND pin close to the IC. This voltage could be used for programming of voltage and current regulation and for programming the TS threshold.
ISET 7 I Charge current set input. The voltage of ISET pin programs the charge current regulation, pre-charge current and termination current set-point.
VFB 8 O Output voltage analog feedback adjustment. Connect the output of a resistive voltage divider from the battery terminals to this node to adjust the output battery regulation voltage.
SRN 9 I Charge-current sense resistor, negative input. A 0.1-μF ceramic capacitor is placed from SRN to SRP to provide differential-mode filtering. An optional 0.1-μF ceramic capacitor is placed from SRN pin to GND for common-mode filtering.
SRP 10 I Charge-current sense resistor, positive input. A 0.1-μF ceramic capacitor is placed from SRN to SRP to provide differential-mode filtering. A 0.1-μF ceramic capacitor is placed from SRP pin to GND for common-mode filtering.
GND 11 -- Low-current sensitive analog/digital ground. On PCB layout, connect with thermal pad underneath the IC.
REGN 12 O PWM low-side driver positive 6-V supply output. Connect a 1-μF ceramic capacitor from REGN to the PGND pin, close to the IC. Use for low-side driver and high-side driver bootstrap voltage by connecting a small-signal Schottky diode from REGN to BTST.
LODRV 13 O PWM low-side driver output. Connect to the gate of the low-side power MOSFET with a short trace.
PH 14 I PWM high-side driver negative supply. Connect to the phase-switching node (junction of the low-side power MOSFET drain, high-side power MOSFET source, and output inductor).
HIDRV 15 O PWM high-side driver output. Connect to the gate of the high-side power MOSFET with a short trace.
BTST 16 I PWM high-side driver negative supply. Connect the 0.1-μF bootstrap capacitor from PH to BTST, and a bootstrap Schottky diode from REGN to BTST.
Thermal pad -- -- Exposed pad beneath the IC. Always solder thermal pad to the board, and have vias on the thermal pad plane star-connecting to GND and ground plane for high-current power converter. It also serves as a thermal pad to dissipate the heat.