LP28301 datasheet(7/9 Pages) POWER

7 / 9 page

LP28301-02

Mar.-2017

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 7 of 9

Preliminary Datasheet

LP28301

Application Information

The LP28301 is a single cell Li-Ion battery charger. It

integrates the input reverse-blocking FET, high-side

switching FET, low-side switching FET, and BATFET

between VSNS and battery to protect battery. The

device also integrates the bootstrap diode for the

high-side gate drive.

Power Up from DC Source

When the DC source plugs in, the LP28301 checks

the input source voltage to turn on REGN LDO and

all the bias circuits. It also checks the input current

limit before starts the buck converter.

Input Source Qualification

After REGN LDO powers up, the LP28301 checks

the current capability of the input source. The input

source has to meet the following requirements to

start the buck converter.

1. VIN voltage below 14V

2. REG voltage above 2.43V

Once the input source passes all the conditions

above, then a permit signal is asserted to the chip.

Adapter Current Detection

The USB ports on personal computers are

convenient charging source for portable devices

(PDs). If the portable device is attached to a USB

host, the USB specification requires the portable

device to draw limited current (100mA/500mA in

USB 2.0, and 150mA/900mA in USB 3.0). If the

portable device is attached to a charging port, it is

allowed to draw up to the maximum current form the

USB host by VREG voltage above 2.43V.

Charge state indication

As showed below, the STAT and FULL LED respond

to this six STATES.

STATE

STAT

FULL

Without Battery

Flicker

Light On

Charging

Light On

Light Off

Charge Complete

Light Off

Light On

Battery Overheat

Flicker

Light Off

Time Out

Flicker

Light Off

VREG < VREG(th)

Light On

Light Off

Battery Charging Management

The LP28301 charges 1-cell Li-Ion battery with up to

5A charge current for high capacity tablet battery.

The low dissipation BATFET improves charging

efficiency and minimizes the voltage drop during

discharging.

Autonomous Charging Cycle

With battery charging enabled, the LP28301 can

complete a charging cycle.

The charger device automatically terminates the

charging cycle when the charging current is below

termination threshold and charge voltage is above

recharge threshold. When a full battery voltage is

discharged below recharge threshold 0.15V, the

LP28301 automatically starts another charging cycle.

The STAT output indicates the charging status of

charging (LOW), charging complete or charge

disable (HIGH) or charging fault (Blinking). The three

states indicate the different charging phases:

low-charging, high-charge complete, blink-charge

fault. Another charge down indication is FULL(low

when charge complete or without battery).

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