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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1737 Datasheet

Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller

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EVALUATION KIT AVAILABLE
AVAILABLE
MAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
General 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 ter-
minals. The external N-channel switch and synchronous
rectifier provide high efficiency over a wide input volt-
age range. A built-in safety timer automatically termi-
nates charging once the adjustable time limit has been
reached.
The MAX1737 regulates the voltage set point and charg-
ing current using two loops that work together to transi-
tion 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 bat-
tery 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 Computers
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
MAX1737
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 ConfiguratioTnIMsERa2pp14ear at end of data15shFAeUeLTt.
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 Cycle
Safely Precharges Near-Dead Cells
Continuous Voltage and Temperature Monitoring
<1µA Shutdown Battery Current
Input Voltage Up to +28V
Safety Timer Prevents Overcharging
Input Current Limiting
Space-Saving 28-Pin QSOP
300kHz PWM Oscillator Reduces Noise
90% Conversion Efficiency
PART
MAX1737EEI
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 QSOP
Typical Operating Circuit
INPUT SUPPLY
ON
OFF
DCIN CSSP
VL CSSN
DHI
REF MAX1737 LX
ISETIN
ISETOUT
BST
VLO
CELL
VADJ
DLO
PGND
CS
CCS
BATT
CCV
CCI
TIMER1
TIMER2
THM
FASTCHG
FULLCHG
FAULT
SHDN
GND
SYSTEM
LOAD
RS
Li+
BATTERY
1 TO 4
CELLS
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1626; Rev 4; 9/07


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1737 Datasheet

Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller

No Preview Available !

MAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
ABSOLUTE MAXIMUM RATINGS
CSSP, CSSN, DCIN to GND ...................................-0.3V to +30V
BST, DHI to GND....................................................-0.3V to +36V
BST to LX..................................................................-0.3V to +6V
DHI to LX ..........................................-0.3V to ((BST - LX) + 0.3V)
LX to GND ...............................................-0.3V to (CSSN + 0.3V)
FULLCHG, FASTCHG, FAULT to GND ..................-0.3V to +30V
VL, VLO, SHDN, CELL, TIMER1, TIMER2, CCI,
CCS, CCV, REF, ISETIN, ISETOUT, VADJ,
THM to GND ........................................................-0.3V to +6V
DLO to GND...............................................-0.3V to (VLO + 0.3V)
BATT, CS to GND ...................................................-0.3V to +20V
PGND to GND, CSSP to CSSN..............................-0.3V to +0.3V
VL to VLO ..............................................................-0.3V to +0.3V
VL Source Current...............................................................50mA
Continuous Power Dissipation (TA = +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW
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 = VCSSN = VCSSP = +18V, SHDN = VL, CELL = GND, VBATT = VCS = +4.2V, VVADJ = VREF / 2, ISETIN =
ISETOUT = REF, RTHM = 10kΩ, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SUPPLY AND REFERENCE
DCIN Input Voltage Range
6 28 V
DCIN Quiescent Supply Current
6.0V < VDCIN < 28V
5 7 mA
DCIN to BATT Undervoltage Threshold,
DCIN Falling
0.05 0.155 V
DCIN to BATT Undervoltage Threshold,
DCIN Rising
0.19 0.40 V
VL Output Voltage
VL Output Load Regulation
REF Output Voltage
REF Line Regulation
REF Load Regulation
SWITCHING REGULATOR
PWM Oscillator Frequency
LX Maximum Duty Cycle
CSSN + CSSP Off-State Leakage
DHI, DLO On-Resistance
LX Leakage
BATT, CS Input Current
BATT, CS Input Voltage Range
Battery Regulation Voltage (VBATTR)
Absolute Voltage Accuracy
Battery Regulation Voltage Adjustment
Range
6.0V < VDCIN < 28V
IVL = 0 to 15mA
6V < VDCIN < 28V
IREF = 0 to 1mA
5.10
4.179
5.40
44
4.20
2
6
5.70
65
4.221
6
14
V
mV
V
mV
mV
VBATT = 15V, CELL = VL
In dropout fOSC / 4, VCCV = 2.4V,
VBATT = 15V, CELL = VL
VCSSN = VCSSP = VDCIN = 28V, SHDN = GND
LX = VDCIN = 28V, SHDN = GND
SHDN = GND, VBATT = 19V
CELL = SHDN = VL, VBATT = 17V
CELL = float, GND, VL, or REF (Note 1)
Not including VADJ resistor tolerances
With 1% VADJ resistors
VCCV = 2V
VVADJ = GND
VVADJ = REF
270
97
0
4.167
-0.8
-1
3.948
4.386
300
98
2
0.1
0.1
225
4.2
3.979
4.421
330
10
7
10
5
500
19
4.233
+0.8
+1
4.010
4.453
kHz
%
µA
Ω
µA
µA
V
V/cell
%
V/cell
2 Maxim Integrated


Part Number MAX1737
Description Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller
Maker Maxim
Total Page 18 Pages
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