MAX1737 ,Stand-Alone Switch-Mode Lithium-Ion Battery-Charger ControllerApplicationsINPUT SUPPLYNotebook Computers Li+ Battery PacksCSSPDCINHand-Held Instruments Desktop C ..
MAX1737EEI ,Stand-Alone Switch-Mode Lithium-Ion Battery-Charger ControllerApplicationsINPUT SUPPLYNotebook Computers Li+ Battery PacksCSSPDCINHand-Held Instruments Desktop C ..
MAX1737EEI ,Stand-Alone Switch-Mode Lithium-Ion Battery-Charger ControllerFeaturesThe MAX1737 is a switch-mode lithium-ion (Li+) battery Stand-Alone Charger for Up to Four ..
MAX1737EEI+ ,Stand-Alone Switch-Mode Lithium-Ion Battery-Charger ControllerFeaturesThe MAX1737 is a switch-mode lithium-ion (Li+) battery♦ Stand-Alone Charger for Up to Four ..
MAX1737EEI+ ,Stand-Alone Switch-Mode Lithium-Ion Battery-Charger ControllerEVALUATION KIT AVAILABLEMAX1737 Stand-Alone Switch-ModeLithium-Ion Battery-Charger Controller
MAX1737EEI+T ,Stand-Alone Switch-Mode Lithium-Ion Battery-Charger ControllerFeaturesThe MAX1737 is a switch-mode lithium-ion (Li+) battery♦ Stand-Alone Charger for Up to Four ..
MAX4566CSE ,Quad/Dual / Low-Voltage / Bidirectional RF/Video SwitchesFeaturesThe MAX4565/MAX4566/MAX4567 are low-voltage ' High 50Ω Off Isolation: -83dB at 10MHzT-switc ..
MAX4566CSE ,Quad/Dual / Low-Voltage / Bidirectional RF/Video SwitchesMAX4565/MAX4566/MAX456719-1252; Rev 0; 7/97Quad/Dual, Low-Voltage,Bidirectional RF/Video Switches__ ..
MAX4566CSE+ ,Quad Dual, Low-Voltage, Bidirectional RF Video SwitchesGeneral Description ________
MAX4567CSE ,Quad/Dual / Low-Voltage / Bidirectional RF/Video SwitchesFeaturesThe MAX4565/MAX4566/MAX4567 are low-voltage ' High 50Ω Off Isolation: -83dB at 10MHzT-switc ..
MAX4567EEE+ ,Quad Dual, Low-Voltage, Bidirectional RF Video SwitchesFeaturesThe MAX4565/MAX4566/MAX4567 are low-voltage ♦ High 50Ω Off Isolation: -83dB at 10MHzT-switc ..
MAX4567ESE+T ,Quad Dual, Low-Voltage, Bidirectional RF Video SwitchesMAX4565/MAX4566/MAX456719-1252; Rev 0; 7/97Quad/Dual, Low -Voltage,Bidirectional RF/Video Sw itches ..
MAX1737
Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller
AVAILABLE
EVALUATION KIT AVAILABLE
General DescriptionThe 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
FeaturesStand-Alone Charger for Up to Four Li+ Cells±0.8% Accurate Battery Regulation VoltageLow Dropout: 98% Duty CycleSafely Precharges Near-Dead CellsContinuous Voltage and Temperature Monitoring <1µA Shutdown Battery Current Input Voltage Up to +28VSafety Timer Prevents OverchargingInput Current LimitingSpace-Saving 28-Pin QSOP300kHz PWM Oscillator Reduces Noise90% Conversion Efficiency
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger ControllerGND
DCINCSSP
CSSN
BST
VLO
DLO
PGND
THM
BATT
FASTCHG
FULLCHG
FAULT
SHDNON
OFF
TIMER2
TIMER1
Li+
BATTERY
1 TO 4
CELLS
CCI
CCV
CCS
VADJ
ISETIN
REF
ISETOUT
INPUT SUPPLY
CELL
DHI
SYSTEM
LOAD
MAX1737
PARTMAX1737EEI -40°C to +85°C
TEMP RANGEPIN-PACKAGE28 QSOP
Typical Operating CircuitDCIN
CSSP
CSSN
DHI
BST
FAULT
VLO
DLO
PGND
SHDN
FULLCHG
FASTCHG
TIMER2
TIMER1
CELL
CCI
CCS
CCV
VADJ
BATT
GND
REF
THM
ISETOUT
ISETIN
QSOPTOP VIEW
MAX1737
Pin Configuration
Ordering InformationNotebook Computers
Hand-Held Instruments
Li+ Battery Packs
Desktop Cradle Chargers
MAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
ABSOLUTE MAXIMUM RATINGS
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.)
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.
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, FAULTto 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°CREF Output Voltage
SWITCHING REGULATOR
SUPPLY AND REFERENCEWith 1% VADJ resistors-1+1Absolute Voltage AccuracyNot including VADJ resistor tolerances-0.8+0.8%
VVADJ= REF
VVADJ= GND
PARAMETERCONDITIONSMINTYPMAXUNITS
6.0V < VDCIN< 28V
SHDN= GND, VBATT= 19V
LX = VDCIN= 28V, SHDN= GND
IREF= 0 to 1mA
6V < VDCIN< 28V
VCSSN= VCSSP= VDCIN= 28V, SHDN= GND
In dropout fOSC /4, VCCV= 2.4V,
VBATT= 15V, CELL = VL
6.0V < VDCIN< 28V
VBATT= 15V, CELL = VL
IVL= 0 to 15mA0.15BATT, CS Input Current0.110LX Leakage7DHI, DLO On-Resistance210CSSN + CSSP Off-State Leakage9798LX Maximum Duty Cycle
kHz270300330PWM Oscillator Frequency57DCIN Quiescent Supply Current628DCIN Input Voltage Range614REF Load Regulation26REF Line Regulation
4.1794.204.2210.050.155DCIN to BATT Undervoltage Threshold,
DCIN Falling 0.190.40DCIN to BATT Undervoltage Threshold,
DCIN Rising5.105.405.70VL Output Voltage4465VL Output Load Regulation
225500CELL = SHDN= VL, VBATT= 17V
BATT, CS Input Voltage Range
Battery Regulation Voltage (VBATTR)CELL = float, GND, VL, or REF (Note 1)
V/cell
Battery Regulation Voltage Adjustment
RangeVCCV= 2V3.9483.9794.010V/cell
MAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
ELECTRICAL CHARACTERISTICS (continued)(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.)
Full-Charge Timer8190100min
Fast-Charge Timer8190100min
BATT Overvoltage Threshold (Note 5)4.554.674.8V/cell
BATT Charge Current Full-Charge
Termination Threshold CS-BATT (Note 6)354455mV
BATT Recharge Voltage Threshold (Note 7)949596% of
VBATTR
TIMER1, TIMER2 Oscillation Frequency2.12.332.6kHz
Prequalification Timer6.257.58.75min
CCI, CCS Clamp Voltage with Respect
to CCV25200mV
CCV Clamp Voltage with Respect
to CCI, CCS25200mV
THM Trip-Threshold Voltage1.3861.41.414V
THM Low-Temperature Current46.24951.5µA
THM High-Temperature Current344353362µA
THM COLD Threshold Resistance (Note 3)26.9228.7030.59kΩ
THM HOT Threshold Resistance (Note 3)3.8193.9644.115kΩ
BATT Undervoltage Threshold (Note 4)2.42.52.6V/cell
THM low-temperature or high-temperature
current
VTHM= 1.4V
VTHM= 1.4V
Combines THM low-temperature current and
THM rising threshold, VTRT/ITLTC
Combines THM high-temperature current and
THM rising threshold, VTRT/ITHTC
CCV Amplifier Transconductance (Note 2)0.390.5840.80mS
CCV Amplifier Maximum Output Current±50µA
CS to BATT Current-Sense Voltage304050mV
CS to BATT Full-Scale Current-Sense
Voltage185200215mV
CS to BATT Current-Sense Voltage When in
Prequalification State51015mV
CS to BATT Hard Current-Limit Voltage355385 415mV
CSSP to CSSN Current-Sense Voltage102030mV
CSSP to CSSN Full-Scale
Current-Sense Voltage90105115mV
CCI Amplifier Transconductance0.611.4mS
CCI Amplifier Output Current±100µA
CCS Amplifier Transconductance1.222.6mS
CCS Amplifier Output Current±100µA
4.15V < VBATT< 4.25V, VCCV= 2V
3.5V < VBATT< 5V, VCCV= 2V
VISETOUT= VREF / 5
VBATT= 3V to 17V, CELL = GND or VL
VBATT< 2.4V per cell
6V < VCSSP< 28V, VISETIN = VREF/ 5,
VCCS= 2V
6V < VCSSP< 28V, VCCS= 2V
VCCI= 2V
VCS- VBATT= 0, 400mV
ISET= REF, VCCS= 2V
VCSSP- VCSSN = 0, 200mV
PARAMETERMINTYPMAXUNITSCONDITIONS
STATE MACHINE
ERROR AMPLIFIERSMAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
ELECTRICAL CHARACTERISTICS (continued)(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.)
CELL Input Voltage0.5
VREF- 0.3VREF+ 0.3V
VVL- 0.4VVL
FASTCHG, FULLCHG, FAULT
Output Low Voltage0.5V
FASTCHG, FULLCHG, FAULTOutput High
Leakage1µA
For 1 cell
For 2 cells
For 3 cells
For 4 cells
ISINK= 5mA
FASTCHG, FULLCHG, FAULT= 28V;
SHDN= GND
Top-Off Timer40.54549.8min
SHDNInput Voltage High1.4V
SHDNInput Voltage Low (Note 8)0.6V
VADJ, ISETIN, ISETOUT Input Voltage
Range0VREFV
VADJ, ISETIN, ISETOUT
Input Bias CurrentnA-5050
SHDNInput Bias Current-11µA
CELL Input Bias Current-55µA
ISETIN Adjustment RangeVREF / 5VREFV
ISETOUT Adjustment RangeVREF / 5VREFV
ISETOUT Voltage for ICHG = 0150220300mV
VVADJ, VISETIN, VISETOUT= 0 or 4.2V
SHDN = GND or VL
PARAMETERMINTYPMAXUNITSCONDITIONSTemperature Measurement Frequency0.981.121.32Hz1nF on TIMER1 and TIMER2
CONTROL INPUTS/OUTPUTSMAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
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
= -40°C to +85°C, unless otherwise noted.) (Note 9)
PARAMETERCONDITIONSMINMAXUNITSDCIN Input Voltage Range
VL Output Voltage
REF Output Voltage
REF Line Regulation
PWM Oscillator Frequency
DHI, DLO On-Resistance
BATT, CS Input Voltage Range
Battery Regulation Voltage (VBATTR)
Absolute Voltage Accuracy
CS to BATT Current-Sense Voltage
CS to BATT Full-Scale Current-Sense
Voltage
CS to BATT Current-Sense Voltage When in
Prequalification State
CS to BATT Hard Current-Limit Voltage
CSSP to CSSN Current-Sense Voltage
CSSP to CSSN Full-Scale Current-Sense
Voltage
THM Trip-Threshold Voltage
THM Low-Temperature Current
THM COLD Threshold Resistance (Note 3)
BATT Undervoltage Threshold (Note 4)
BATT Overvoltage Threshold (Note 5)
BATT Charge Current Full-Charge
Termination Threshold, CS-BATT (Note 6)
Temperature Measurement Frequency 1nF on TIMER1 and TIMER2
4.554.8V/cell55mV
0.931.37Hz
6.0V < VDCIN< 28V
6V < VDCIN< 28V
VBATT= 15V, CELL = VL
CELL = float, GND, VL, or REF
Not including VADJresistor tolerances
VISETOUT= VREF/5
VBATT= 3V to 17V, CELL = GND or VL
VBATT< 2.4V per cell
6V < VCSSP< 28V, VISETIN= VREF/5,
VCCS= 2V
6V < VCSSP< 28V, VCCS= 2V
THM low-temperature or high-temperature current
VTHM= 1.4V
Combines THM low-temperature current and
THM rising threshold, VTRT/ITLTC
260340kHzmV
4.1664.242VΩ
019V
4.1584.242V/cell1%
628V
5.15.7V55mV
180220mV
317mV
350420mV
535mV115mV
1.3861.414V
46.251.5µA
26.9230.59kΩ
2.42.6V/cell
SUPPLY AND REFERENCE
SWITCHING REGULATOR
ERROR AMPLIFIERS
STATE MACHINEMAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
ELECTRICAL CHARACTERISTICS (continued)(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
= -40°C to +85°C, unless otherwise noted.) (Note 9)
Note 1:Battery Regulation Voltage = Number of Cells ×(3.979V + 0.10526 ×VVADJ).
Note 2:This transconductance is for one cell. Divide by number of cells to determine actual transconductance.
Note 3:See Thermistorsection.
Note 4:Below this threshold, the charger reverts to prequalification mode and ICHGis reduced to about 5% of full scale.
Note 5:Above this threshold, the charger returns to reset.
Note 6:After full-charge state is complete and peak inductor current falls below this threshold, FULLCHGoutput switches high.
Battery charging continues until top-off timeout occurs.
Note 7:After charging is complete, when BATT voltage falls below this threshold, a new charging cycle is initiated.
Note 8:In shutdown, charging ceases and battery drain current drops to 5µA (max), but internal IC bias current remains on.
Note 9:Specifications to -40°C are guaranteed by design and not production tested.
SHDNInput Voltage Low (Note 8)0.6V
SHDNInput Voltage High1.4 V
PARAMETERMINTYPMAXUNITSCONDITIONS
CONTROL INPUTS/OUTPUTSMAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger ControllerBATTERY VOLTAGE
vs. CHARGING CURRENT
MAX1737 toc01
CHARGING CURRENT (A)
BATTERY VOLTAGE (V)
R18 = 0.1Ω
CHARGING CURRENT-SENSE VOLTAGE
vs. ISETOUT VOLTAGE
MAX1737 toc02
ISETOUT VOLTAGE (V)
CHARGING CURRENT-SENSE VOLTAGE (mV)
INPUT CURRENT-SENSE VOLTAGE
vs. ISETIN VOLTAGE
MAX1737 toc03
ISETIN VOLTAGE (V)
INPUT CURRENT-SENSE VOLTAGE (mV)
VOLTAGE LIMIT vs. VADJ VOLTAGE
MAX1737 toc04
VADJ VOLTAGE (V)
VOLTAGE LIMIT (V)
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1737 toc05
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
EFFICIENCY vs. INPUT VOLTAGE
MAX1737 toc06
INPUT VOLTAGE (V)
EFFICIENCY (%)
CELL = FLOAT (2 CELLS)
VBATT = 7V
R18 = 0.1Ω (IBATT = 2A)
REFERENCE LOAD REGULATION
MAX1737 toc07
REFERENCE CURRENT (μA)
REFERENCE VOLTAGE (V)
TIMEOUT vs. TIMER1 CAPACITANCE
MAX1737 toc08
CAPACITANCE (nF)
TIMEOUT (MINUTES)
PREQUALIFICATION MODE
TOP-OFF MODE
FULL-CHARGE
MODE
FAST-CHARGE TIMEOUT
vs. TIMER2 CAPACITANCE
MAX1737 toc09
CAPACITANCE (nF)
TIMEOUT (MINUTES)
Typical Operating Characteristics
(Circuit of Figure 1, VDCIN= +18V, ISETIN = ISETOUT = REF, VVADJ= VREF / 2, TA= +25°C, unless otherwise noted.)
MAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
Pin DescriptionSource Current-Sense Positive Input. See Input Current Regulator section.CSSP27
Power-Supply Input. DCIN is the input supply for the VL regulator. Bypass DCIN to GND with a
0.1µF capacitor. Also used for the source undervoltage sensing.DCIN28
Synchronous-Rectifier MOSFET Gate-Drive Bias. Bypass VLO to PGND with a 0.1µF capacitor.VLO22
High-Side MOSFET Gate Drive Bias. Connect a 0.1µF or greater capacitor from BST and LX.BST23
Power Inductor Switching Node. Connect LX to the high-side MOSFET source.LX24
High-Side MOSFET Gate-Drive OutputDHI25
Source Current-Sense Negative Input. See Input Current Regulatorsection.CSSN 26
Shutdown Input. Drive SHDNlow to disable charging. Connect SHDNto VL for normal
operation.SHDN18
Battery Current-Sense Positive Input. SeeCharging Current Regulator section.CS19
Power GroundPGND20
Synchronous-Rectifier MOSFET Gate-Drive Output DLO21
Full-Charge Indicator. Open-drain output pulls low when charging with constant voltage in
full-charge state.FULLCHG17
Fast-Charge Indicator. Open-drain output pulls low when charging with constant current.FASTCHG16
Charge Fault Indicator. Open-drain output pulls low when charging terminates abnormally
(Table 1).FAULT15
Timer 2 Adjustment. Connect a capacitor from TIMER2 to GND to set the fast-charge time. See
Timers section.TIMER214
Voltage Regulation Loop Compensation PointCCV9
Input Source Current Regulation Compensation PointCCS10
Battery-Current Regulation Loop Compensation PointCCI11
Cell-Count Programming Input. See Table 2CELL12
Timer 1 Adjustment. Connect a capacitor from TIMER1 to GND to set the prequalification,
full-charge, and top-off times. See Timers section.TIMER113
4.2V Reference Voltage Output. Bypass REF to GND with a 1µF or larger ceramic capacitor. REF5
Analog GroundGND6
Battery Voltage-Sense Input and Current-Sense Negative InputBATT7
Voltage Adjust. Use a voltage-divider to set the VADJ voltage between 0 and VREFto adjust the
battery regulation voltage by ±5%. See Setting the Voltage Limit section.VADJ8
Thermistor Input. Connect a thermistor from THM to GND to set a qualification temperature
range. If unused, connect a 10kΩresistor from THM to ground. See Thermistorsection.THM4
Battery Charging Current Adjust. Use a voltage-divider to set the voltage between 0 and VREF.
See Charging Current Regulator section.ISETOUT3
PINInput Current Limit Adjust. Use a voltage-divider to set the voltage between 0 and VREF.
SeeInput Current Regulator section.ISETIN2
Chip Power Supply. Output of the 5.4V linear regulator from DCIN. Bypass VL to GND with a
2.2µF or larger ceramic capacitor.VL1
FUNCTIONNAMEMAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
Detailed DescriptionThe MAX1737 includes all of the functions necessary to
charge between one and four series Li+ battery cells. It
includes a high-efficiency synchronous-rectified step-
down DC-DC converter that controls charging voltage
and current. It also includes input source-current limit-
ing, battery temperature monitoring, battery undervolt-
age precharging, battery fault indication, and a state
machine with timers for charge termination.
The DC-DC converter uses an external dual N-channel
MOSFET as a switch and a synchronous rectifier to
convert the input voltage to the charging current or volt-
age. The typical application circuit is shown in Figure 1.
Figure 2 shows a typical charging sequence and
Figure 3 shows the block diagram. Charging current is
set by the voltage at ISETOUT and the voltage across
R18. The battery voltage is measured at the BATT pin.
The battery regulation voltage is set to 4.2V per cell
and can be adjusted ±5% by changing the voltage at
the VADJ pin. By limiting the adjust range, the voltageCSSPDCIN
CSSN
VLO
BST
DHI
DLO
PGND
BATT
THM
REF
ISETIN
SHDN
ISETOUT
VADJ
CELL
GND
CCV
CCI
CCS
TIMER1
TIMER2
R12
Li+
BATTERY
(1 TO 4 CELLS)
R1822μH
FAULT
FULLCHG
FULL CHARGE
FAST CHARGE
FAULT
FASTCHG
47nF
C13
1nF
C14
1nF
1nF
47nF
1μF
4.7μFC18
22μF
C19
22μF
SYSTEM
LOAD
INPUT
SUPPLY
0.1μF
0.1μF
0.1μF
10k
0.1μF
0.1μF
0.1μF
C15
68μF0.1μF
C110.1μF
C10
0.1μF
MAX1737+
THERMISTOR
Figure 1. Typical Application Circuit
MAX1737
