LTC4061EDD(RevA) View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC4061EDD
(Rev.:RevA)

Standalone Linear Li-Ion Battery Charger with Thermistor Input

Linear Technology 

LTC4061

APPLICATIO S I FOR ATIO

MOSFET, MP1, is used to prevent back conducting into the

USB port when a wall adapter is present and a Schottky

diode, D1, is used to prevent USB power loss through the

1kΩ pull-down resistor.

Typically a wall adapter can supply more current than

the 500mA limited USB port. Therefore, an N-channel

MOSFET, MN1, and an extra 3.3kΩ program resistor are

used to increase the charge current to 800mA when the

wall adapter is present.

5V WALL

ADAPTER

ICHG = 800mA

USB POWER

ICHG = 500mA MP1

D1

VCC

BAT

LTC4061

IDET

C/5 PROG

3.3k

SYSTEM

LOAD

+ Li-Ion

BATTERY

1k

MN1

2k 1.25k

4061 F08

Figure 8. Combining Wall Adapter and USB Power

4061fa

18

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