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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1898 Datasheet

Linear Charger for Single-Cell Li Battery

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MAX1898 pdf
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
CT
BATT
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1898 Datasheet

Linear Charger for Single-Cell Li Battery

No Preview Available !

MAX1898 pdf
Linear Charger for Single-Cell Li+ Battery
ABSOLUTE MAXIMUM RATINGS
IN, DRV, CS, CHG to GND .....................................-0.3V to +14V
BATT, EN, ISET, RSTRT, CT to GND ........................-0.3V to +6V
DRV to IN................................................................-14V to +0.3V
IN to CS Current ....................................................................±2A
DRV Continuous Current ..................................................±10mA
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ..........444mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ....................………..+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 8V, VBATT = 4V, EN/OK = open, RSET = 2.8k, RSTRT = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are
at TA = +25°C.)
PARAMETER
Supply Voltage Range
Input OK Trip Point, IN Rising
(VIN - VBATT)
Input OK Trip Point, IN Falling
(VIN - VBATT)
VIN Input OK Trip Point, IN Rising
VIN Input OK Trip Point, IN Falling
EN/OK Sink Current (When Input
Power Not OK)
EN/OK Source Current (When
Input Power OK)
EN/OK Logic Input High
EN/OK Logic Input Low
BATT Input Current
IN, CS Input Current
VOLTAGE LOOP
Voltage-Loop Set Point
Voltage-Loop Gain
VBATT Prequal Voltage Threshold
DRV Sink Current
DRV Output Resistance
CONDITIONS
VIN = 3.9V, VBATT = 4V,
VEN/OK = 0.8V
VEN/OK = 2V
4.5V VIN 12V
4.5V VIN 12V
Done, RSTRT = GND, VBATT = 4.1V for
MAX1898EUB42 and 4.0V for MAX1898EUB41
Done, RSTRT = open, VBATT = 4.1V for
MAX1898EUB42 and 4.0V for MAX1898EUB41
EN/OK = GND
VIN = 4V
VIN = VBATT = 4V (IIN + ICS)
VIN = 12V, (IIN + ICS), done, RSTRT = open
MAX1898EUB42
MAX1898EUB41
VDRV/VBATT
Timers running
MAX1898EUB42
MAX1898EUB41
VDRV = VIN - 1V, VBATT = 3.5V
MIN TYP MAX UNITS
4.5 12 V
45 70 100 mV
30 55 85
4.0 4.25 4.5
3.9 4.15 4.4
100
mV
V
V
µA
5 10 20 µA
2V
0.6 V
40 100
4 10 µA
4 10
3 10
2 10 µA
2 5 mA
4.168
4.069
2.394
2.337
4
4.2
4.1
51
2.520
2.460
470
4.232
4.131
2.646
2.583
V
dB
V
mA
2 _______________________________________________________________________________________


Part Number MAX1898
Description Linear Charger for Single-Cell Li Battery
Maker Maxim
Total Page 12 Pages
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MAX1898 pdf
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