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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1757 Datasheet

Stand-Alone / Switch-Mode Li Battery Charger with Internal 14V Switch

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MAX1757 pdf
19-1754; Rev 0; 6/00
EVAALVUAAILTAIOBNLEKIT
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
General Description
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.
________________________Applications
Li+ Battery Packs
Notebook Computers
Hand-Held Instruments
PDAs
Desktop Cradle Chargers
Pin Configuration
TOP VIEW
Features
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
Ordering Information
PART
MAX1757EAI
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
28 SSOP
Typical Operating Circuit
VIN
6V to 14V
DCIN
REF
CSSP
CSSN
HSD
MAX1757
ISETOUT
LX
BST
VL
ISETIN
CELL
PGND
CS
SYSTEM
LOAD
VL 1
ISETTIN 2
ISETOUT 3
THM 4
REF 5
GND 6
VADJ 7
BATT 8
HSD 9
HSD 10
CELL 11
TIMER1 12
TIMER2 13
FAULT 14
MAX1757
SSOP
28 DCIN
27 CSSP
26 CSSN
25 CCV
24 CCI
23 CCS
22 BST
21 CS
20 LX
19 LX
18 PGND
17 SHDN
16 FULLCHG
15 FASTCHG
VADJ
BATT
THM
CCS
CCI
ON
OFF
CCV FASTCHG
TIMER1
FULLCHG
TIMER2
FAULT
SHDN
GND
THERM
Li+ BATTERY
1 TO 3 CELLS
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1757 Datasheet

Stand-Alone / Switch-Mode Li Battery Charger with Internal 14V Switch

No Preview Available !

MAX1757 pdf
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
ABSOLUTE MAXIMUM RATINGS
BATT, CS, DCIN, CSSP, CSSN, HSD to GND ........-0.3V to +15V
CSSP to CSSN.......................................................-0.6V to +0.6V
BST to GND ............................................................-0.3V to +21V
BST to LX..................................................................-0.3V to +6V
LX to PGND ..............................................-0.6V to (VHSD + 0.3V)
VL, SHDN, ISETIN, ISETOUT, REF, VADJ, CELL, TIMER1,
TIMER2, CCI, CCS, CCV, THM to GND ................-0.3V to +6V
FASTCHG, FULLCHG, FAULT to GND ..................-0.3V to +30V
CS to BATT Current ............................................................±3.5A
PGND to GND .......................................................-0.3V to +0.3V
VL Source Current...............................................................50mA
Continuous Power Dissipation (TA = +70°C)
28-Pin SSOP (derate 9.5mW/°C above +70°C) ...........762mW
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.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VDCIN = VHSD = VCSSP = VCSSN = 12V, V SHDN = VVL, VCELL = GND, VBATT = VCS = 4.2V, VVADJ = VREF/2,
VISETIN = VISETOUT = VREF, RTHM = 10k, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SUPPLY AND REFERENCE
DCIN Input Voltage Range
DCIN Quiescent Supply Current
DCIN to BATT Dropout
Threshold, DCIN Falling
SYMBOL
CONDITIONS
6V < VDCIN < 14V
Falling edge
DCIN to BATT Dropout
Threshold, DCIN Rising
VL Output Voltage
VL Output Load Regulation
Rising edge
6V < VDCIN < 14V
IVL = 0 to 15mA
REF Output Voltage
VREF 6V < VDCIN < 14V
REF Line Regulation
REF Load Regulation
SWITCHING REGULATOR
PWM Oscillator Frequency
LX Maximum Duty Cycle
CSSN/CSSP Off-State Leakage
HSD Off-State Leakage
LX Off-State Leakage
HSD to LX On-Resistance
LX to PGND On-Resistance
CS to BATT Current-Sensing
Resistance
BATT, CS Input Current
fOSC
RCS
6V < VDCIN < 14V
IREF = 0 to 1mA
Nondropout fOSC
In dropout, fOSC / 4
VCSSN = VCSSP = VDCIN = 14V, V SHDN = GND
VLX = PGND, VHSD = VDCIN = 14V,
V SHDN = GND
VLX = VHSD = VDCIN =14V, V SHDN = GND
VBST = VLX + 4.5V
See PWM Controller section
Internal resistor between CS and BATT,
1.5A RMS operating
V SHDN = GND, VBATT =14V
CELL = REF, VBATT = 12V, any charging state
VBATT = 14V, done state
MIN
6
0.075
0.20
5.10
4.179
270
97
TYP
5
0.125
0.30
5.40
44
4.20
2
6
300
98
2
0.1
0.1
150
1
110
0.1
280
150
MAX UNITS
14
7
0.175
V
mA
V
0.40
5.70
65
4.221
6
14
V
V
mV
V
mV
mV
330 kHz
%
10 µA
10 µA
10 µA
250 m
2
170 m
5 µA
540 µA
270 µA
2 _______________________________________________________________________________________


Part Number MAX1757
Description Stand-Alone / Switch-Mode Li Battery Charger with Internal 14V Switch
Maker Maxim
Total Page 17 Pages
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