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 MAX PackageApplication·Single-Cell Li+ Powered Portables
·Self-Charging Battery Packs
·PDAs
·Cell Phones
·Cradle ChargersPinout
SpecificationsIN, 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 MAX (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.
DescriptionThe MAX1898, with an external PNP or PMOS transistor,forms a complete charger for 1-cell lithium-ion (Li+) batteries.
It provides accurate constant-current/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 current. Additional features include shutdown, optional charge-cycle restart without input-power cycling, selectable charge termination safety timer, and low-current preconditioning for deeply discharged cells.
The MAX1898 offers the maximum integration and functionality in the smallest, most basic application circuit possible. Very few external components are required.
It 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 ultrathin MAX package.
MAX1898 Data Sheet
