MAX1737
MAX1737 is Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller manufactured by Maxim Integrated.
Description
The MAX1737 is a switch-mode lithium-ion (Li+) battery charger that charges one to four cells. It provides a regulated charging current and a regulated voltage with only a ±0.8% total voltage error at the battery terminals. The external N-channel switch and synchronous rectifier provide high efficiency over a wide input voltage range. A built-in safety timer automatically terminates charging once the adjustable time limit has been reached.
The MAX1737 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. An additional control loop monitors the total current drawn from the input source to prevent overload of the input supply, allowing the use of a low-cost wall adapter.
The per-cell battery voltage regulation limit is set between +4.0V and +4.4V and can be set from one to four by pin strapping. Battery temperature is monitored by an external thermistor to prevent charging if the battery temperature is outside the acceptable range.
The MAX1737 is available in a space-saving 28-pin QSOP package. Use the evaluation kit (MAX1737EVKIT) to help reduce design time.
Applications
Notebook puters Hand-Held Instruments
Li+ Battery Packs Desktop Cradle Chargers
TOP VIEW
Pin Configuration Functional Diagrams
VL 1
28 DCIN
ISETIN 2
27 CSSP
ISETOUT 3
26 CSSN
THM 4
25 DHI
REF 5 GND 6
24 LX 23 BST
BATT 7
22 VLO
VADJ 8
21 DLO
CCV 9
20 PGND
CCS 10
19 CS
CCI 11
18 SHDN
CELL 12
17 FULLCHG
TIMER1 13
16 FASTCHG
Pin Configuratio Tn IMs ERa2pp14ear at end of data15sh FAe Ue LTt. Functional Diagrams continued at end of data sheet.
QSOP UCSP is a trademark of Maxim Integrated Products, Inc.
Features
- Stand-Alone Charger for Up to Four Li+ Cells
- ±0.8% Accurate Battery Regulation Voltage
- Low Dropout: 98% Duty...
