MAX1909 Maxim Integrated Products, MAX1909 Datasheet

MAX1909

Manufacturer Part Number

MAX1909

Description

(MAX8725 / MAX1909) Multichemistry Battery Charger

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1909.pdf (30 pages)

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The MAX1909/MAX8725 highly integrated control ICs

simplify construction of accurate and efficient multi-

chemistry battery chargers. The MAX1909/MAX8725

use analog inputs to control charge current and volt-

age, and can be programmed by a host microcontroller

(µC) or hardwired. High efficiency is achieved through

use of buck topology with synchronous rectification.

The maximum current drawn from the AC adapter is pro-

grammable to avoid overloading the AC adapter when

supplying the load and the battery charger simultane-

ously. The MAX1909/MAX8725 provide a digital output

that indicates the presence of an AC adapter, and an

analog output that monitors the current drawn from the

AC adapter. Based on the presence or absence of the

AC adapter, the MAX1909/MAX8725 automatically select

the appropriate source for supplying power to the sys-

tem by controlling two external p-channel MOSFETs.

Under system control, the MAX1909/MAX8725 allow the

battery to undergo a relearning or conditioning cycle in

which the battery is completely discharged through the

system load and then recharged.

The MAX1909 includes a conditioning charge feature

while the MAX8725 does not. The MAX1909/MAX8725

are available in space-saving 28-pin, 5mm

QFN packages and operate over the extended -40°C to

+85°C temperature range. The MAX1909/MAX8725 are

now available in lead-free packages.

19-2805; Rev 2; 9/04

Multichemistry Battery Chargers with Automatic

Functional Diagrams appear at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

GND/PKPRES

Notebook and Subnotebook Computers

Hand-Held Data Terminals

TOP VIEW

MODE

ACOK

DCIN

ACIN

LDO

REF

________________________________________________________________ Maxim Integrated Products

General Description

THIN QFN

MAX1909

MAX8725

Pin Configuration

Applications

DLOV

DLO

PGND

CSIP

CSIN

BATT

GND

5mm thin

System Power Selector

MAX1909ETI

MAX1909ETI+

MAX8725ETI

MAX8725ETI+

Denotes lead-free package.

±0.5% Accurate Charge Voltage (0°C to +85°C)

±3% Accurate Input Current Limiting

±5% Accurate Charge Current

Programmable Charge Current >4A

Automatic System Power-Source Selection

Analog Inputs Control Charge Current and

Charge Voltage

Monitor Outputs for

Up to 17.65V (max) Battery Voltage

Maximum 28V Input Voltage

Greater than 95% Efficiency

Charge Any Battery Chemistry: Li+, NiCd, NiMH,

Lead Acid, etc.

MAX8725 ONLY

AC ADAPTER: INPUT

Current Drawn from AC Input Source

AC Adapter Presence

PART

LDO

Minimum Operating Circuit

LDO

IINP

REF

-40 C to +85 C

TEMP RANGE

PDS

SRC

DCIN

VCTL

ICTL

MODE

ACIN

IINP

CLS

ACOK

PKPRES

CCV

CCI

CCS

Ordering Information

CSSP

MAX1909

MAX8725

0.01Ω

REF

CSSN

PGND

DLOV

DHIV

CSIP

CSIN

BATT

GND

LDO

DLO

PDL

DHI

SRC

0.015Ω

PIN-PACKAGE

28 Thin QFN

Features

EXTERNAL LOAD

10µH

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