LP28601 datasheet(10/12 Pages) POWER

10 / 12 page

LP28601-02

Mar.-2017

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 10 of 12

Preliminary Datasheet

LP28601

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

Dynamic Power Management

To meet maximum current limit in USB spec and

avoid over loading the adapter, the LP28601

features Dynamic Power Management (DPM), which

continuously monitors the input current and input

voltage. When input source is over-loaded because

the charge current is too large, either the current

exceeds the input current limit or the voltage falls

below the input voltage limit by detection from REG.

The device then reduces the charge current until the

REG voltage rises above the threshold voltage and

the input current is less than the current limit.

Power Path Management

The LP28601 accommodates a wide range of input

sources from USB to wall adapter. The device

provides automatic power path selection to supply

the system (SYS) from input source (VBUS), battery

(BAT), or both.

If the system current and the input current limit is

large than the adapter current limit, the adapter

voltage would be pulled down by this large system

current.

Battery Charging Management

The LP28601 charges 1-cell Li-Ion battery with up to

3.5A 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 LP28601 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 LP28601 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).

Battery Charging Profile

The device charges the battery in three phases:

preconditioning, constant current and constant

voltage. At the beginning of a charging cycle, the

device checks the battery voltage and applies

current.

If the charger device is in DPM regulation or thermal

regulation during charging, the actual charging

current will be less than the programmed value. In

this case, termination is temporarily disabled and the

charging safety timer is counted.

LP28601 数据表(PDF) 10 Page - Lowpower Semiconductor inc

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