[AP4305]

Rev 0.5.0

1

The AP4305 is an IC for charge control for single-cell lithium-ion and lithium-polymer batteries. This device

offers complete charge control solution such as constant-current and constant-voltage control and suspension

control for various abnormalities. Voltage and current control by switching converter enables high-speed

charging even through USB connection. The AP4305 supplies two current outputs, one for battery charging

and the other for system power, at the same time by the input current from USB. The device integrates an

input current limiting circuit to comply with the USB standards. The AP4305 also allows the seamless current

supply from the battery to the system when the system requires more current than USB input.

The AP4305 also features an automatic input current limit according to the actual input power source capability

by monitoring the input voltage. The AP4305 automatically limits the input current from USB and supplies the

optimum charge current to the battery.

The NTC thermistor monitors battery temperature and enables charging voltage and charging current control

depending on the temperature, complying with the safety standard of the lithium-ion batteries (JEITA). To

reduce power consumption during charging, the output voltage from the DC/DC converter is controlled to a

minimum voltage required for charging depending on the battery voltage.

This product is ideal for managing the lithium-ion and lithium-polymer batteries of portable equipment.

□ Charging current control with input current limit

- The step-down switching DC/DC converter allows continuous charge from the USB maximum current.

□ 3.0 MHz switching frequency for small external components

□ Integrated phase compensation circuit

□ Automatic input current limit according to the actual input power source capability

□ Battery regulation voltage accuracy: ±0.5% (Ta = 10

 60C), ±1.1% (Ta = -30  85C)

□ Input current limit accuracy: ±5%, Charging current accuracy: ±10%

□ Automatic management of power supply from a USB power source and a battery by the integrated power

path control FET (95mΩ max).

□ Maximum charging current: 1.5 A

□ Input over voltage protection: 20V absolute maximum for USB

□ Battery temperature monitoring and control functions by the NTC thermistor (JEITA)

□ Charge control ideal for lithium-ion and lithium-polymer batteries

- Constant-current charging and constant-voltage charging by the switching DC/DC converter

- Three-phase constant-current charging. Charging from over discharged condition (Trickle charge 1),

Precharge (Trickle charge 2), Fast constant-current charging (Fast Charge).

- Fast charge current and Full charge voltage can be programmed.

□ Various charging parameters can be configured according to the charging safety range.

□ Detection of charging time-out (charging from over discharged condition, precharge, fast charge)

□ Protective function: safety timer, over temperature protection, current limit

- Input/output over voltage protection, charge stop function at low input voltage

□ Small number of external components for saving space by integrated switching MOSFETs.

□ No external current sense resistor by integrated charge current sense.

□ Power supply voltage: 4.1 V

 6.0 V

□ Temperature range: -30

 85C

□ Small thin package: WLCSP 25 pins

□ Application: Portable devices with single-cell lithium-ion and lithium-polymer batteries

Overview

Features

AP4305

Preliminary

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