LP5306 datasheet(7/8 Pages) POWER

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Preliminary Datasheet

LP5306

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LP5306 Version 0.2 JUN.-2018

Application Information

The LP5306 devices monitor the input voltage,

battery voltage, and output current to protect the

charging system of a Li-Ion battery. When enabled,

the system is protected against input overvoltage by

turning off an internal switch, immediately removing

power from the charging circuit. For an over-current

condition, the device limits the output current at the

setting value, and if the over-current persists, the

switch will turn off after a blanking time. Additionally,

the device also monitors its own temperature and

switches off if device too hot.

Under Voltage Lockout (UVLO)

The LP5306 had an UVLO internal circuit that enable

the device once the voltage on the VIN voltage

exceeds the UVLO threshold voltage.

Input Over Voltage Protection

The LP5306 Input has an over voltage protection to

protect the battery charging system. When the VIN

voltage rises above 6.8V(Typ.), the system will turns

the switch off.

Battery Over Voltage Protection

The battery overvoltage threshold VBOVP is internally

set to 4.35V. If the battery voltage exceeds the

threshold, the switch is turned off, and the Fault pin is

go low.

Once the battery voltage drops to (VBOVP-

ΔV

BOVP), the switch is turned back on. And the switch

is turned off permanently, when battery overvoltage

occurs 15 times in one charge cycle. For cleared this

event, the VIN power or EN need to re-cycled.

Over Temperature Protection

The

LP5306

device

enters

over

temperature

protection(OTP) if its junction temperature exceeds

140°C (Typ.). During over temperature protection

none of the device's functions are available. To

resume normal operation the junction temperature

need cool down, and the outputs will restart.

Enable Control

The LP5306 has an enable pin which can be used to

enable or disable the device. When the EN pin is

driven high, the switch is turned off. The EN pin has

an internal pull-down resistor can be floating.

Fault Flag

The FAULT pin is open-drain output.

• Input Over Voltage

• Output Over Current

• Battery Over Voltage

• Over Temperature

Over Current Protection

The Over Current threshold can adjustable by a

external resistor RSET connected from the ISET pin

to GND. The equation is apply under below:

IOCP=25000

÷R

SET

If the output current exceed the IOCP threshold, the

device limits the current for a blanking duration of TOC.

If the over current situation exceeds the TOC, the

switch will turned off, and the Fault pin is go low. The

switch will re-soft start again after TOCR. And the

switch is turned off permanently, when over current

event occurs 15 times in one charge cycle. For

cleared this event, the VIN power or EN need to

re-cycled

Layout Consideration

The proper PCB layout and component placement are

critical for all circuit.

LP5306

is meant to protect

downstream circuit. Here are some suggestions to the

layout design.

Connected

all

ground

together

with

one

uninterrupted ground plane, which include power

ground and analog ground.

2. The input and output capacitor should be located as

closed as possible to the chip and ground plane.

3. Other components should be located close to the

chip.

LP5306

GND

Fault

VOUT

ISET

BAT

Exposed

Pad

VIN

RBAT

RILIM

COUT

GND

VOUT

VIN

Figure10. Recommended PCB Layout Diagram

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