General Description

The XT2052 is a constant- current / constant- voltage

charger circuit for single cell lithium-ion batteries. The

device includes an internal power transistor, does not need

external current sense resistor and blocking diode in

applications. XT2052 requires minimal external

components, and meet the USB bus specification, is very

suitable for portable applications in the field.

Thermal modulation circuit can control the internal

chip temperature in a safe range when the device power

dissipation be relatively large or the ambient temperature

be higher.

When the input voltage (AC adapter or USB power

supply) power is lost, XT2052 automatically enters a low

power sleep mode, then the battery current consumption is

less than 0.1μA. Built-in protection circuits against irrigation,

when the battery voltage is higher than the input voltage,

automatically turn off built-in power MOSFET. Other

features include low input voltage latch, automatic

recharge, the battery temperature monitoring, and charge

status / charge status indication functions. XT2052 uses

thermally enhanced 8-pin small outline package ESOP8.

■ Features

Programmable charge current up to 1A

No MOSFET, sense resistor or blocking diode

required

Complete linear charger in small package for single

cell lithium-ion batteries

Constant-current/constant-voltage operation with

thermal regulation to maximize charge rate without

risk of overheating

Charges single cell li-ion batteries directly from USB

port

Preset 4.2V

Monitor output charge current

Automatic recharge

Charge status output pin

1/10 charge current termination

40µA supply current in shutdown

2.9V trickle charge threshold

Soft-Start limits inrush current

Output with protection against anti-irrigation

Available in ESOP8 or customer order form

When you unplug VIN , the IC does not consume

battery power