ADP3804 Analog Devices, ADP3804 Datasheet

ADP3804

Manufacturer Part Number

ADP3804

Description

High Frequency Switch Mode Li-Ion Battery Charger

Manufacturer

Analog Devices

Datasheet

1.ADP3804.pdf (7 pages)

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Quantity

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

ADP3804JRU-12.5-RL

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Quantity:

6 500

Company:

Meier Automation Equipment Co., Limited

Part Number:

ADP3804JRU-12.5-RL

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REV. PrI

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

FEATURES

Li-Ion Battery Charger

Fixed 12,525 V, 12.600 V, or Adjustable Battery

High End-of-Charge Voltage Accuracy

Programmable Charge Current with

System Current Sense with Reverse Input Protection

Softstart Charge Current

Undervoltage Lockout

Boosted Synchronous Drive For External NMOS

Programmable Oscillator Frequency

Oscillator SYNC Pin

Constant Current/Constant Voltage Flag

Trickle Charge

APPLICATIONS

Portable Computers

Fast Chargers

Li-Ion Battery Charger

Fixed 12,525 V, 12.600 V, or Adjustable Battery

High End-of-Charge Voltage Accuracy

Programmable Charge Current with

System Current Sense with Reverse Input Protection

Softstart Charge Current

Undervoltage Lockout

Boosted Synchronous Drive For External NMOS

Programmable Oscillator Frequency

Oscillator SYNC Pin

Constant Current/Constant Voltage Flag

Trickle Charge

Portable Computers

Fast Chargers

Preliminary Technical Data

Voltage

Rail-to-Rail Sensing

0.4% @ +25

0.4% @ +25 C C C C C

0.6% @ 5

0.6% @ 5 C to 55

0.75% @ 0

0.75% @ 0 C to 85

12/5/00

C to 55

C to 55 C C C C C

C to 85

C to 85 C C C C C

REG

REF

ADP3804

REFERENCE

VCC BSTREG

REGULATOR

SUPPLY

BOOST

BIAS

AGND

FUNCTIONAL BLOCK DIAGRAM

VREF

UVLO

BST DRVH

SYNCHRONOUS

BOOSTED

SYNC

DRIVER

OSCILLATOR

DRVL

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

GENERAL DESCRIPTION

The ADP3804 is a complete Li-Ion battery charging IC. The

device combines high output voltage accuracy with constant

current control to simplify the implementation of Constant-

Current, Constant-Voltage (CCCV) chargers. The ADP3804 is

available in two options. The ADP3804-12.6 guarantees the

final battery voltage to 12.6 V ± 0.6%, the ADP3804-12.5

guarantees 12.525 V ± 0.6% and the ADP3804 is adjustable

using two external resistors to set the battery voltage. The

current sense amplifier has rail-to-rail inputs to accurately

operate under low drop out and short circuit conditions. The

charge current is programmable with a DC voltage on ISET. A

second differential amplifier senses the system current across an

external sense resistor and outputs a linear voltage on the ISYS

pin. The boosted synchronous driver allows the use of two

NMOS transistors for lower system cost.

COMP

High Frequency Switch Mode

PGND

g m1

g m2

CCCV

CS+

AMP

Li-Ion Battery Charger

VREF

ADP3804-12.6

ADP3804-12.5

DIVIDER

INPUT

BATTERY

SYS+

ADJUST

World Wide Web Site: http://www.analog.com

AMP

SYS

LIMIT

ISYS

ADJ

ISET

BAT

ADP3804

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