MAX1757 Maxim, MAX1757 Datasheet
MAX1757
Manufacturer Part Number
MAX1757
Description
Stand-Alone / Switch-Mode Li Battery Charger with Internal 14V Switch
Manufacturer
Maxim
Datasheet
1.MAX1757.pdf
(17 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX1757EAI
Manufacturer:
MAXIM/美信
Quantity:
20 000
The MAX1757 is a switch-mode lithium-ion (Li+) battery
charger that charges one to three cells. It provides a
regulated charging current accurate to ±10% and a
regulated voltage with only a ±0.8% total voltage error
at the battery terminals. The internal high-side switch
delivers a programmable current of up to 1.5A to
charge the battery. The built-in safety timer automatical-
ly terminates charging once the adjustable time limit
has been reached.
The MAX1757 regulates the voltage set point and
charging current using two loops that work together to
transition smoothly between voltage and current regula-
tion. An additional control loop monitors the total cur-
rent drawn from the input source (charging + system)
and by automatically reducing battery-charging current
prevents overload of the input supply, allowing the use
of a low-cost wall adapter.
The per-cell battery regulation voltage is set between
4.0V and 4.4V using standard 1% resistors. The num-
ber of cells is set from 1 to 3 by pin strapping. Battery
temperature is monitored by an external thermistor to
prevent charging outside the acceptable temperature
range.
The MAX1757 is available in a space-saving 28-pin
SSOP package. Use the MAX1757EVKIT to help reduce
design time. For a stand-alone charger with a 28V
switch, refer to the MAX1758 data sheet. For a charger
controller capable of up to 4A charging current, refer to
the MAX1737 data sheet.
19-1754; Rev 0; 6/00
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
________________________Applications
Li+ Battery Packs
Notebook Computers
Hand-Held Instruments
Li+ Battery Charger with Internal 14V Switch
TOP VIEW
ISETOUT
ISETTIN
TIMER1
TIMER2
FAULT
VADJ
BATT
CELL
THM
GND
HSD
HSD
REF
VL
________________________________________________________________ Maxim Integrated Products
10
11
12
13
14
1
2
3
4
5
6
7
8
9
General Description
MAX1757
SSOP
Pin Configuration
PDAs
Desktop Cradle Chargers
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DCIN
CSSP
CSSN
CCV
CCI
CCS
BST
CS
LX
LX
PGND
SHDN
FULLCHG
FASTCHG
Stand-Alone, Switch-Mode
o Stand-Alone Charger for Up to 3 Li+ Batteries
o ±0.8% Battery Regulation Voltage Accuracy
o Low-Dropout 98% Duty Cycle
o Safely Precharges Near-Dead Cells
o Continuous Voltage and Temperature Monitoring
o 0.1µA Shutdown Battery Current
o Input Voltage Up to 14V
o Up to 1.5A Programmable Charge Current
o Input Current Limiting
o Space-Saving 28-Pin SSOP
o 300kHz PWM Oscillator Reduces Noise
6V to 14V
MAX1757EAI
V
IN
PART
ON
OFF
Typical Operating Circuit
ISETOUT
ISETIN
CELL
VADJ
CCS
CCI
CCV
TIMER1
TIMER2
REF
SHDN
DCIN
TEMP. RANGE
-40°C to +85°C
MAX1757
GND
Ordering Information
CSSP
FASTCHG
FULLCHG
FAULT
CSSN
PGND
BATT
THM
HSD
BST
CS
LX
VL
PIN-PACKAGE
28 SSOP
THERM
Features
SYSTEM
LOAD
Li+ BATTERY
1 TO 3 CELLS
1
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