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MAX1898EUB42+T

P1-P3P4-P6P7-P9P10-P12
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.
Features
♦ Simple, Safe Linear Charger
♦ Uses Low-Cost PNP or PMOS Pass Element
♦ 4.5V to 12V Input Range
♦ Internal Current-Sense Resistor
♦ ±0.75% Voltage Accuracy
♦ Programmable Charging Current
♦ Automatic Input Power-Source Detection
♦ LED Charge Status Indicator
♦ Programmable Safety Timer
♦ Current-Sense Monitor Output
♦ Optional/Adjustable Auto-Restart
♦ Small µMAX Package
MAX1898
Linear Charger for Single-Cell Li+ Battery
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
MAX1898
IN
CT
RSTRT
GND
EN/OK
CHG
CS
ISET
BATT
DRV
OFF
ON
LED
Li+
BATTERY
SETS CHARGE
CURRENT
CT SETS
CHARGE
TIME
OUTPUT
INPUT
4.5V TO 12V
Typical Operating Circuit
19-2295; Rev 0; 1/02
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.
PART TEMP RANGE PIN-PACKAGE
MAX1898EUB42 -40°C to +85°C 10 µMAX
MAX1898EUB41 -40°C to +85°C 10 µMAX
Pin Configuration
1
2
3
4
5
10
9
8
7
6
CS
DRV
GND
BATTISET
EN/OK
IN
MAX1898
µMAX
TOP VIEW
RSTRTCT
CHG
Applications
Single-Cell Li+ Powered Portables
Self-Charging Battery Packs
PDAs
Cell Phones
Cradle Chargers
MAX1898
Linear Charger for Single-Cell Li+ Battery
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 8V, V
BATT
= 4V, EN/OK = open, RSET = 2.8kΩ, RSTRT = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are
at T
A
= +25°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.
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 (T
A
= +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
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range 4.5 12 V
Input OK Trip Point, IN Rising
(V
IN
- V
BATT
)
45 70 100 mV
Input OK Trip Point, IN Falling
(V
IN
- V
BATT
)
30 55 85 mV
V
IN
Input OK Trip Point, IN Rising 4.0 4.25 4.5 V
V
IN
Input OK Trip Point, IN Falling 3.9 4.15 4.4 V
EN/OK Sink Current (When Input
Power Not OK)
V
IN
= 3.9V, V
BATT
= 4V,
V
EN/OK
= 0.8V
100 µA
EN/OK Source Current (When
Input Power OK)
V
EN/OK
= 2V 5 10 20 µA
EN/OK Logic Input High 4.5V ≤ V
IN
≤ 12V 2 V
EN/OK Logic Input Low 4.5V ≤ V
IN
≤ 12V 0.6 V
Done, RSTRT = GND, V
BATT
= 4.1V for
MAX1898EUB42 and 4.0V for MAX1898EUB41
40 100
Done, RSTRT = open, V
BATT
= 4.1V for
MAX1898EUB42 and 4.0V for MAX1898EUB41
410
EN/OK = GND 4 10
BATT Input Current
V
IN
= 4V 3 10
µA
V
IN
= V
BATT
= 4V (I
IN
+ I
CS
) 2 10 µA
IN, CS Input Current
V
IN
= 12V, (I
IN
+ I
CS
), done, RSTRT = open 2 5 mA
VOLTAGE LOOP
MAX1898EUB42
4.168
4.2
4.232
Voltage-Loop Set Point
MAX1898EUB41
4.069
4.1
4.131
V
Voltage-Loop Gain ∆V
DRV
/∆V
BATT
51 dB
MAX1898EUB42 2.394 2.520 2.646
V
BATT
Prequal Voltage Threshold Timers running
MAX1898EUB41 2.337 2.460 2.583
V
DRV Sink Current V
DRV
= V
IN
- 1V, V
BATT
= 3.5V 4 mA
DRV Output Resistance 470 Ω
MAX1898
Linear Charger for Single-Cell Li+ Battery
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 8V, V
BATT
= 4V, EN/OK = open, RSET = 2.8kΩ, RSTRT = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are
at T
A
= +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Voltage (V
IN
- V
DRV
)V
BATT
= 3.5V 3.5 7 V
V
BATT
Restart Threshold (As a
Percentage of Voltage-Loop Set
Point)
RSTRT = GND 92 95.25 98 %
RSTRT Internal Resistance 100 kΩ
CURRENT LOOP
Internal Current-Sense Resistance IN to CS pin-to-pin resistance 50 105 200 mΩ
RMS Charge Current 1.4 A
Current-Sense Amplifier Gain, I
SET
to I
IN
Fast Charge
I
CS
= 500mA, V
SET
= 1.4V 0.95 1 1.05 mA/A
Current-Sense Amplifier Gain, I
SET
to I
IN
Prequal
I
CS
= 50mA, V
ISET
= 0.14V,
V
BATT
= 2V
0.73 1 1.30 mA/A
Current-Loop Regulation Set Point
RSET = 2.8kΩ, V
BATT
= 3.5V, closed-loop
performance
450 500 550 mA
Current-Loop Gain ∆V
DRV
/∆V
ISET
26 dB
I
LOAD
falling, RSET = 2.8kΩ 15 20 25
CHG Trip Threshold (As a
Percentage of Full Load Current)
I
LOAD
rising, RSET = 2.8kΩ 17 22 27
%
TIMER FUNCTION
Timer Source/Sink Current V
CT
= 0.9V 5 µA
Timer Accuracy C
CT
= 100nF for 2 hours, 54 minutes nominal -10 +10 %
CHG Output Low Current V
CHG
= 1V 4 5 6 mA
CHG Output High Leakage V
CHG
= 12V 1 µA
CHG Blink Rate Fault state (50% duty cycle), CT = 100nF 1 1.5 2 Hz
ELECTRICAL CHARACTERISTICS
(V
IN
= 8V, V
BATT
= 4V, EN/OK = open, RSET = 2.8kΩ, RSTRT = GND, T
A
= -40°C to +85°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN MAX UNITS
Supply Voltage Range 4.5 12 V
Input OK Trip Point, IN Rising
(V
IN
- V
BATT
)
45 100 mV
Input OK Trip Point, IN Falling
(V
IN
- V
BATT
)
30 85 mV
V
IN
Input OK Trip Point, IN Rising 4.0 4.5 V
V
IN
Input OK Trip Point, IN Falling 3.9 4.4 V
EN/OK Sink Current (When Input
Power Not OK)
V
IN
= 3.9V, V
BATT
= 4V, V
EN/OK
= 0.8V 100 µA
EN/OK Source Current (When Input
Power OK)
V
EN/OK
= 2V 5 20 µA
EN/OK Logic Input High 4.5V ≤ V
IN
≤12V 2 V
EN/OK Logic Input Low 4.5V ≤ V
IN
≤12V 0.6 V
P1-P3P4-P6P7-P9P10-P12

MAX1898EUB42+T

Mfr. #:
Buy MAX1898EUB42+T
Manufacturer:
Maxim Integrated
Description:
Battery Management Linear Charger for 1-Cell Li+ Battery
Lifecycle:
New from this manufacturer.
Delivery:
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