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LTC4156_15: 产品描述Dual-Input Power Manager/ 3.5A LiFePO4 Battery Charger with I2C Control and USB OTG; 文件大小516KB，共52页; 制造商Linear ( ADI ); 官网地址http://www.analog.com/cn/index.html

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LTC4156_15概述

Dual-Input Power Manager/ 3.5A LiFePO4 Battery Charger with I2C Control and USB OTG

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LTC4156

Dual-Input Power Manager/

3.5A LiFePO

Battery Charger

with I

C Control and USB OTG

FEATURES

DESCRIPTION

The LTC

4156 is a 15 watt I

C controlled power manager

with PowerPath™ instant-on operation, high efficiency

switching battery charging and USB compatibility. The

LTC4156 seamlessly manages power distribution from

two 5V sources, such as a USB port and a wall adapter, to

a single-cell rechargeable lithium iron phosphate battery

and a system load.

The LTC4156’s switching battery charger automatically

limits its input current for USB compatibility, or may

draw up to 3A from a high power wall adapter. The high

efficiency step-down switching charger is designed to

provide maximum power to the application and reduced

heat in high power density applications.

C adjustability of input current, charge current, battery

float voltage, charge termination, and many other param-

eters allows maximum flexibility. I

C status reporting of

key system and charge parameters facilitates intelligent

control decisions. USB On-The-Go support provides 5V

power back to the USB port without any additional com-

ponents. A dual-input, priority multiplexing, overvoltage

protection circuit guards the LTC4156 from high voltage

damage on the V

BUS

pin.

The LTC4156 is available in the low profile (0.75mm)

28-lead 4mm

5mm QFN surface mount package.

High Efficiency Charger Capable of 3.5A

Charge Current

Charge Control Algorithm Specifically Designed for

LiFePO

Batteries (Lithium Iron Phosphate)

Monolithic Switching Regulator Makes Optimal Use

of Limited Power and Thermal Budget

Dual Input Overvoltage Protection Controller

Priority Multiplexing for Multiple Inputs

C/SMBus Control and Status Feedback

NTC Thermistor ADC for Temperature Dependent

Charge Algorithms (JEITA)

Instant-On Operation with Low Battery

Battery Ideal Diode Controller for Power

Management

USB On-The-Go Power Delivery to the USB Port

Four Float Voltage Settings (3.45V, 3.55V, 3.6V, 3.8V)

28-Lead 4mm

5mm QFN Package

APPLICATIONS

Portable Medical Devices

Portable Industrial Devices

Backup Devices

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

TYPICAL APPLICATION

C Controlled High Power Battery Charger/USB Power Manager

1µH

WALLSNS

WALLGT

BUS

LTC4156

USBGT

USBSNS

IRQ

GND CLPROG2 CLPROG1 PROG V

1.21k

499

OUT

CHGSNS

BATGATE

BATSNS

NTCBIAS

NTC

OVGCAP

47nF

4156 TA01a

Switching Regulator Efficiency

100

EFFICIENCY (%)

0.5

2.0

1.5

1.0

LOAD CURRENT (A)

BAT

= 3.3V

2.5

3.0

4156 TA01b

SYSTEM

LOAD

10µF

3.6k

22µF

100k

4156f

LTC4156

TABLE OF CONTENTS

Features ............................................................................................................................ 1

Applications ....................................................................................................................... 1

Typical Application ............................................................................................................... 1

Description......................................................................................................................... 1

Absolute Maximum Ratings ..................................................................................................... 3

Order Information ................................................................................................................. 3

Pin Configuration ................................................................................................................. 3

Electrical Characteristics ........................................................................................................ 4

Typical Performance Characteristics .......................................................................................... 9

Pin Functions .....................................................................................................................12

Block Diagram....................................................................................................................15

Timing Diagrams ................................................................................................................16

Operation..........................................................................................................................17

C ........................................................................................................................................................................ 17

Applications Information .......................................................................................................40

Typical Applications .............................................................................................................47

Package Description ............................................................................................................51

Typical Application ..............................................................................................................52

Related Parts .....................................................................................................................52

4156f

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