MAX1758 Maxim, MAX1758 Datasheet
MAX1758
Manufacturer Part Number
MAX1758
Description
Stand-Alone / Switch-Mode Li Battery Charger with Internal 28V Switch
Manufacturer
Maxim
Datasheet
1.MAX1758.pdf
(17 pages)
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The MAX1758 is a switch-mode lithium-ion (Li+) battery
charger that charges one-to-four cells. It provides a reg-
ulated charging current accurate to ±10% and a regu-
lated 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 bat-
tery. The built-in safety timer automatically terminates
charging once the adjustable time limit has been
reached.
The MAX1758 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 automatically reduces battery-charging current,
preventing overload of the input supply and 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-4 by pin strapping. Battery
temperature is monitored by an external thermistor to
prevent charging outside the acceptable temperature
range.
The MAX1758 is available in a space-saving 28-pin
SSOP package. Use the MAX1758EVKIT to help reduce
design time. For a stand-alone charger with a 14V
switch, refer to the MAX1757 data sheet. For a charger
controller capable of up to 4A charging current, refer to
the MAX1737 data sheet.
19-1752; Rev 1; 1/01
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
________________________Applications
Li+ Battery Packs
Notebook Computers
Li+ Battery Charger with Internal 28V Switch
TOP VIEW
ISETOUT
TIMER1
TIMER2
ISETIN
FAULT
VADJ
BATT
CELL
THM
GND
HSD
HSD
REF
________________________________________________________________ Maxim Integrated Products
VL
10
11
12
13
14
1
2
3
4
5
6
7
8
9
General Description
MAX1758
SSOP
Pin Configuration
Hand-Held Instruments
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 4 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 28V
o Up to 1.5A Programmable Charge Current
o Safety Timer Prevents Overcharging
o Input Current Limiting
o Space-Saving 28-Pin SSOP
o 300kHz PWM Oscillator Reduces Noise
MAX1758EAI
6V TO 28V
V
IN
PART
ON
OFF
Typical Operating Circuit
TIMER1
TIMER2
REF
ISETOUT
ISETIN
CELL
VADJ
CCS
CCI
CCV
SHDN
TEMP. RANGE
-40°C to +85°C
DCIN
MAX1758
GND
Ordering Information
CSSP
FASTCHG
FULLCHG
FAULT
CSSN
PGND
BATT
HSD
THM
BST
CS
LX
VL
PIN-PACKAGE
28 SSOP
THERM
Features
SYSTEM
LOAD
Li+ BATTERY
1 TO 4 CELLS
1
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