UB10803G-SH2-T datasheet, PDF - EEWORLD Datasheet

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UB10803G-SH2-T: DescriptionONE-CELL STANDALONE LINEAR LITHIUM BATTERY CHARGER; File Size250KB，10 Pages; ManufacturerUNISONIC TECHNOLOGIES CO.,LTD; Websitehttp://www.unisonic.com.tw/

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UB10803G-SH2-T Overview

ONE-CELL STANDALONE LINEAR LITHIUM BATTERY CHARGER

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UNISONIC TECHNOLOGIES CO., LTD

UB10803

Preliminary

CMOS IC

ONE-CELL STANDALONE

LINEAR LITHIUM BATTERY

CHARGER



DESCRIPTION

SOP-8

The UTC

UB10803

is a fully-integrated single-cell Li-ion/Polymer

battery charger. The device operates without external FET and

blocking diode, and employs a constant-current constant-voltage

(CC/CV) charging profile.

The fast-charge and end-of-charge (EOC) currents are

programmable with independent external resistors. When the battery

is deeply discharged to lower than 2.75V, the charger firstly

pre-charges the battery with typically 20% of the programmable

fast-charge current. When the charge current is reduced to the

programmed EOC current level (almost works completely in a

constant-voltage (CV) mode), an EOC indication is displayed through

the CHG pins. The UTC

UB10803

is protected by thermal regulation

technology to prevent the IC from over-heat during charging.

Two status indication pins (PPR and CHG), which are both

implemented as an open-drain outputs, can be used to drive LEDs or

work as logic interface to a microprocessor. When no adapter is

attached or when the charger is disabled, the leakage current from

battery cell is less than 1uA typically.



FEATURES

* A Constant-Current/Constant-Voltage Linear Charger

for Single-Cell Li-ion/Polymer Batteries

* Integrated Pass Element and Current Sensor

* Highly-Integrated, Requiring No External FETs or

Blocking Diode

* 4.2V Voltage Accuracy: ±1.2% All Temperatures

(Available with 4.10V and 4.36V options upon request)

* Programmable Charge Current 50mA to 500mA

* Programmable End-Of-Charge Current by Current

Recharge Algorithm

DFN-8(2x3)

* Pre-Charge for Fully Discharged Batteries

* 1μA (Typ.) Leakage Current of the Battery when No

Input Power is Attached or Charger is Disabled

* Power Present and Charge Status Indications

* Thermal Regulation on Charging Current to Prevent

Over-Heat

* Few Components, Cost-Effective Solutions



ORDERING INFORMATION

Ordering Number

Lead Free

UB10803L-SH2-T

UB10803L-SH2-R

UB10803L- K08-2030-R

Halogen Free

UB10803G-SH2-T

UB10803G-SH2-R

UB10803G- K08-2030-R

Package

HSOP-8

DFN-8(2×3)

Packing

Tube

Tape Reel

www.unisonic.com.tw

1 of 10

QW-R502-A26.a

UB10803



OPERATION

Preliminary

CMOS IC

The UTC

UB10803

charges a single-cell Li-ion/Polymer battery with a programmed constant current (CC) or a

constant voltage (CV) profile. The constant fast charge current I

CHG

is programmable by setting an external resistor

IREF

while the constant voltage is factory-trimmed at 4.2V (4.10V or 4.36V options are available upon request). If the

battery voltage is deeply discharged to lower than 2.75V, The UTC

UB10803

pre-charges the battery with a 20%

programmable current until the battery voltage rises above the pre-charge threshold. After pre-charge finishes,

constant-current (CC) charging mode begins with the pre-set fast charge current. Normally, the battery voltage rises

gradually during CC charge phase. When the battery voltage reaches nearly 4.2V, the charger enters the

constant-voltage (CV) charging mode and begins to regulate the battery voltage at 4.2V while diminishing the

charging current gradually. When the charging current is reduced to an amount smaller than the programmed

End-Of-Charge (EOC) current level, the charger gives out a “full-charge” indication through the CHG pin, but the

charger still continues to regulate the battery voltage at 4.2V with safe & small current.

The end-of-charge (EOC) current level (I

MIN

) can be easily programmed with an external resistor R

IMIN

. The CHG

signal turns to LOW when pre-charge starts and rises to HIGH when EOC is reached. After reaching EOC, the

charge current has to rise again to typically 76% of I

CHG

before the CHG signal will turn on again. The current surge

after EOC can be caused by a load connected to the battery.

When the die temperature reaches

115°C

(typically), a thermal regulation function is employed to reduce the

charge current accordingly to maintain the temperature from increasing furthermore. This is an important function to

achieve safe operation even when the printed circuit board (PCB) is not effective in leaking out the heat generated

by the linear charger.

1. PPR Indication

The PPR pin is implemented as an open-drain output to provide a power-good indication of the input power source

such as an AC adapter. When the input voltage is higher than the POR (Power-On Reset) threshold, the PPR pin

turns on the internal open-drain MOSFET to indicate logic LOW signal. The PPR indication is designed to be

independent on the chip enable (EN-pin) input. When the internal open-drain FET is turned off, the PPR pin should

leak less than 1μA current. When turned on, the PPR pin should be able to sink at least 5mA current under all

operating conditions. The PPR pin can be used to drive an LED or worked as logic interface to a microprocessor.

2. Power-Good Range

The input voltage is considered as power good when it meets the following three conditions:

(1). V

> V

POR

(2). V

- V

BAT

> V

Where the V

is the offset voltage, it determines if the battery voltage is even higher than the input voltage. All

POR

and V

are realized with sufficient hysteresis, as given in the Electrical Specification table. All charging

activities are disabled when the input voltage falls out of the power-good range.

3. Input and Output Comparator

Obviously, when the input source voltage is lower than the battery voltage, no charging activity could be started

and the charger will disable the internal pass element to prevent battery leakage. Charge begins when the input

voltage is higher than the battery voltage by a defined offset voltage (V

). This scheme also ensures that the

charger is completely turned off when the input power is removed from the charger.

4. CHG Indication

The CHG pin is implemented as an open-drain output to give a logic LOW when a charge cycle begins and turn

HIGH when an end-of-charge (EOC) condition is reached. This pin is designed with a sinking ability of more than

5mA so as to drive an LED. When the charger is disabled through EN-pin, the CHG output is high impedance. The

CHG pin can also be used to interface with a microprocessor.

5. EN Input

The chip is enabled by a logic LOW signal applied to the EN pin. This pin is realized with a 200kΩ internal

pull-down resistor such that even the EN pin is left floating, the input is equivalent to logic LOW and the chip is

enabled by default. Similarly, the chip is disabled when the EN pin receives a logic HIGH signal.

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

5 of 10

QW-R502-A26.a

UB10803G-SH2-T Related Products

	UB10803G-SH2-T	UB10803	UB10803L-K08-2030-R	UB10803L-SH2-T
Description	ONE-CELL STANDALONE LINEAR LITHIUM BATTERY CHARGER	ONE-CELL STANDALONE LINEAR LITHIUM BATTERY CHARGER	ONE-CELL STANDALONE LINEAR LITHIUM BATTERY CHARGER	ONE-CELL STANDALONE LINEAR LITHIUM BATTERY CHARGER

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