PT8A2803ZEEX datasheet, PDF - EEWORLD Datasheet

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PT8A2803ZEEX: DescriptionIC BATT CHG LI-ION 1 CELL 8TDFN; Categorysemiconductor Power management; File Size177KB，9 Pages; ManufacturerDiodes; Websitehttp://www.diodes.com/; Environmental Compliance

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PT8A2803ZEEX Overview

IC BATT CHG LI-ION 1 CELL 8TDFN

PT8A2803ZEEX Parametric

Parameter Name	Attribute value
battery chemistry	Li-ion/polymer
Number of batteries	1
Current - charging	Constant current - programmable
Programmable features	-
failsafe	-
Charging current - maximum	500mA
Battery pack voltage	4.2V
Voltage - Power Supply (Highest)	5.5V
interface	-
Operating temperature	-30°C ~ 85°C（TA）

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PT8A2803

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500mA Li-ion/Polymer Battery Charger

Features

•

Description

The PT8A2803 is a fully integrated single-cell Li-

ion/Polymer battery charger. The charger operates in a

constant-current-constant-voltage (CC/CV) charging

profile without employing external FETs and blocking

diodes.

The fast charge current and end-of-charge (EOC) current

can be easily programmed by modifying two external

resistors. When the battery is deeply discharged to lower

than 2.8V, 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.

PT8A2803 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 1µA typically.

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

±0.5%

4.2V Voltage Accuracy at Room

Temperature.

±1%

All Temperatures. (Available

with 4.1V and 4.36V options upon request)

Programmable Charge Current 50mA to 500mA

Programmable End-Of-Charge Current by Current

Recharge Algorithm

Pre-Charge for Fully Discharged Batteries

Less Than 1µA Leakage Current Of the Battery

when No Input Power Attached or Charger Disabled

Power Present and Charge Status Indications

Thermal Regulation on Charging Current to Prevent

Over-Heat

Available with 8-pin 2x3 TDFN Package

Cell-phones, PDA, MP3, MP4, PMP

Standalone Chargers

Bluetooth Applications

Applications

Pin Assignment

VIN

PPR

CHG

TDFN 2x3

BAT

IREF

IMIN

GND

Pin Description

I/O

Name

VIN

PPR

CHG

GND

IMIN

IREF

BAT

Descriptions

Supply Input.

Power Present Active-Low Open Drain Power Status Indicator

Charge Active-Low Open Drain Charge Status Indicator

Enable Active-Low Input

Ground

End-Of-Charge Current Setting Input

Charge Current Setting Input

Battery Terminal

PT0324S-1

12/21/10

PT8A2803

500mA Li-ion/Polymer Battery Charger

Power-Good Range

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

1. VIN > VPOR

2. VIN - VBAT > VOS

The VOS is the offset voltage to determine if the battery voltage is even higher than the input voltage. All VPOR and VOS 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.

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 (VOS). This scheme also ensures that the charger is completely turned off when the input

power is removed from the charger.

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 10mA so as to drive an LED.

When the charger is disabled through

-pin, the

CHG

outputs a high impedance. The

CHG

pin can also be used to interface with

a microprocessor.

Input

The chip is enabled by a logic LOW signal applied to the

pin. This pin is realized with a 200kΩ internal pull-down resistor

such that even the

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

pin receives a logic HIGH signal. The threshold for HIGH is given in the ES (Electrical

Specifications).

IMIN Indication

The IMIN pin can be used to program the End-of-Charge (EOC) current by connecting a resistor between this pin and the GND

pin. The programming is defined by the following equation:

IMIN (mA) = 4180/ R

IMIN

Where R

IMIN

is usually in kΩ.

IREF Pin

The IREF pin is for fast charge-current programming. By connecting a resistor between this pin and the GND pin, the fast charge

current limit is determined by the following equation:

CHG

(mA) = 4400/R

IREF

Where R

IREF

is in kΩ. The actual charge current is guaranteed to have 10% accuracy of I

CHG

with the charge current set at 150mA.

BAT pin

Always connect the BAT pin to a single-cell Li-ion/Polymer battery in parallel with a 1µF (or larger) X5R ceramic capacitor for

decoupling and guaranteeing system stability. When the

pin is pulled to logic HIGH, the BAT output is disabled. The

PT8A2803 relies on a battery for stability and is not guaranteed to be stable if the battery is not connected.

Dropout Voltage

When the input voltage is low while the battery voltage is high, the charging current may not be maintained according to the

equation I

MIN

(mA) = 4180/R

IMIN

due to a limited internal on-resistance (R

DS(ON)

) of the internal pass element. The worst resistance

of the pass FET is about 1.2Ω at the maximum operating temperature, thus if tested with 500mA current and 4.2V battery voltage,

constant current could still be maintained when the input voltage is below 4.62V.

Thermal Foldback

The bottom big exposed pad in DFN package is used for thermal foldback. For reducing the chip ambient temperature as much as

possible, it is recommended to connect as much copper as possible to this pad either on the component layer or other layers

through thermal vias. The thermal regulation function starts to reduce the charge current when the internal temperature reaches a

typical value of 115°C.

PT0324S-1

12/21/10

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