MAX1898 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Linear Charger for Single-Cell Li Battery

19-2295; Rev 0; 1/02
Linear Charger for Single-Cell Li+ Battery
General Description
The MAX1898, with an external PNP or PMOS transistor,
forms a complete charger for 1-cell lithium-ion (Li+) bat-
teries. The MAX1898 provides accurate constant-cur-
rent/constant-voltage charging. Battery regulation voltage
accuracy is ±0.75% for optimum battery performance
and cycle life. Charging current is user set, but is sensed
internally so no external current-sense resistor is needed.
The MAX1898 also provides outputs to monitor charge
status, presence-of-input power source, and charge cur-
rent. Additional features include shutdown, optional
charge-cycle restart without input-power cycling, selec-
table charge termination safety timer, and low-current
preconditioning for deeply discharged cells.
The MAX1898 offers the maximum integration and func-
tionality in the smallest, most basic application circuit
possible. Very few external components are required.
The MAX1898 offers two versions to safely charge all
Li+ battery chemistries. The battery regulation voltage
is 4.2V for the MAX1898EUB42 and 4.1V for the
MAX1898EUB41. Both are available in a 10-pin ultra-
thin µMAX package.
Applications
Single-Cell Li+ Powered Portables
Self-Charging Battery Packs
PDAs
Cell Phones
Cradle Chargers
TOP VIEW
IN 1
CHG 2
EN/OK 3
ISET 4
CT 5
Pin Configuration
MAX1898
µMAX
10 CS
9 DRV
8 GND
7 BATT
6 RSTRT
Features
o Simple, Safe Linear Charger
o Uses Low-Cost PNP or PMOS Pass Element
o 4.5V to 12V Input Range
o Internal Current-Sense Resistor
o ±0.75% Voltage Accuracy
o Programmable Charging Current
o Automatic Input Power-Source Detection
o LED Charge Status Indicator
o Programmable Safety Timer
o Current-Sense Monitor Output
o Optional/Adjustable Auto-Restart
o Small µMAX Package
PART
MAX1898EUB42
MAX1898EUB41
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
Typical Operating Circuit
INPUT
4.5V TO 12V
LED
ON
OFF
CT SETS
CHARGE
TIME
IN
CS
MAX1898
CHG
DRV
EN/OK
BATT
CT
ISET
RSTRT
GND
SETS CHARGE
CURRENT
OUTPUT
Li+
BATTERY
________________________________________________________________ Maxim Integrated Products 1
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.