LTC4156 - Dual-Input Power Manager/ 3.5A LiFePO4 Battery Charger with I2C Control and USB OTG

The LTC®4156 is a 15 watt I2C 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.

I2C adjustability of input current, charge current, battery float voltage, charge termination, and many other parameters allows maximum flexibility. I2C 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 components. A dual-input, priority multiplexing, overvoltage protection circuit guards the LTC4156 from high voltage damage on the VBUS pin.

The LTC4156 is available in the low profile (0.75mm) 28-lead 4mm × 5mm QFN surface mount package.

Features

High Efficiency Charger Capable of 3.5A Charge Current
Charge Control Algorithm Specifically Designed for LiFePO4 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
I2C/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

Typical Application

Applications

Portable Medical Devices
Portable Industrial Devices
Backup Devices

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC4156EUFD#PBF	4x5 QFN-28	E	$4.22	$2.95
LTC4156EUFD#TRPBF	4x5 QFN-28	E		$3.01
LTC4156IUFD#PBF	4x5 QFN-28	I	$4.64	$3.25
LTC4156IUFD#TRPBF	4x5 QFN-28	I		$3.31

Demo Boards

Part Number	Description	Price
DC1674A-B	LTC4156EUFD Demo Board \| Dual Input Power Mgr/3.5A LiFePO4 Charger, VIN = 4.35V to 5.5V, VOUT = 4.5V @ 3.5A; DC590B Demo Board is required	$150.00

Companion Boards

Part Number	Description	Price
DC590B	Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards	$50.00