MAX1757EAI ,Stand-Alone, Switch-Mode Li Battery Charger with Internal 14V SwitchFeaturesThe MAX1757 is a switch-mode lithium-ion (Li+) battery Stand-Alone Charger for Up to 3 Li+ ..
MAX1758EAI ,Stand-Alone, Switch-Mode Li Battery Charger with Internal 28V SwitchFeaturesThe MAX1758 is a switch-mode lithium-ion (Li+) battery Stand-Alone Charger for Up to 4 Li+ ..
MAX1758EAI+ ,Stand-Alone, Switch-Mode Li+ Battery Charger with Internal 28V SwitchApplicationsMAX1758 LXLi+ Battery Packs Hand-Held InstrumentsISETOUTBSTNotebook Computers Desktop C ..
MAX1758EAI+T ,Stand-Alone, Switch-Mode Li+ Battery Charger with Internal 28V SwitchFeaturesThe MAX1758 is a switch-mode lithium-ion (Li+) battery♦ Stand-Alone Charger for Up to 4 Li+ ..
MAX1759EUB ,Buck/Boost Regulating Charge Pump in レMAXFeaturesThe MAX1759 is a buck/boost regulating charge pump Regulated Output Voltage (Fixed 3.3V or ..
MAX1759EUB+ ,Buck/Boost Regulating Charge Pump in µMAXFeaturesThe MAX1759 is a buck/boost regulating charge pump♦ Regulated Output Voltage (Fixed 3.3V or ..
MAX4583AUE ,Low-Voltage, CMOS Analog Multiplexers/SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V = 4.5V to 5.5V, V = -4.5V to -5.5V, V = 2.4V, V = 0.8V, ..
MAX4583CEE ,Low-Voltage, CMOS Analog Multiplexers/SwitchesApplications♦ +2V to +12V Single-Supply OperationBattery-Operated Equipment±2V to ±6V Dual-Supply O ..
MAX4583CEE+ ,Low-Voltage, CMOS Analog Multiplexers/SwitchesFeatures♦ MAX4582 Available in AEC-Q100 QualifiedThe MAX4581/MAX4582/MAX4583 are low-voltage,Versio ..
MAX4583CSE ,Low-Voltage, CMOS Analog Multiplexers/SwitchesApplications♦ +2V to +12V Single-Supply OperationBattery-Operated Equipment±2V to ±6V Dual-Supply O ..
MAX4583CSE ,Low-Voltage, CMOS Analog Multiplexers/SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V = 4.5V to 5.5V, V = -4.5V to -5.5V, V = 2.4V, V = 0.8V, ..
MAX4583CSE ,Low-Voltage, CMOS Analog Multiplexers/SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V = 4.5V to 5.5V, V = -4.5V to -5.5V, V = 2.4V, V = 0.8V, ..
MAX1757EAI
Stand-Alone, Switch-Mode Li Battery Charger with Internal 14V Switch
General DescriptionThe 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
FeaturesStand-Alone Charger for Up to 3 Li+ Batteries±0.8% Battery Regulation Voltage AccuracyLow-Dropout 98% Duty CycleSafely Precharges Near-Dead CellsContinuous Voltage and Temperature Monitoring 0.1µA Shutdown Battery CurrentInput Voltage Up to 14VUp to 1.5A Programmable Charge CurrentInput Current LimitingSpace-Saving 28-Pin SSOP300kHz PWM Oscillator Reduces Noise
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
Pin Configuration
Ordering InformationLi+ Battery Packs
Notebook Computers
Hand-Held Instruments
PDAs
Desktop Cradle Chargers
Typical Operating Circuit
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 12V, VSHDN= VVL, VCELL= GND, VBATT= VCS= 4.2V, VVADJ= VREF/2,
VISETIN= VISETOUT= VREF, 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.
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 +6VFASTCHG, FULLCHG, FAULTto 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
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 12V, VSHDN= VVL, VCELL= GND, VBATT= VCS= 4.2V, VVADJ= VREF/2,
VISETIN= VISETOUT= VREF, RTHM= 10kΩ, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 12V, VSHDN= VVL, VCELL= GND, VBATT= VCS= 4.2V, VVADJ= VREF/2,
VISETIN= VISETOUT= VREF, RTHM= 10kΩ, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 12V, VSHDN= VVL, VCELL= GND, VBATT= VCS= 4.2V, VVADJ= VREF/2,
VISETIN= VISETOUT= VREF, RTHM= 10kΩ, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 12V, VSHDN= VVL, VCELL= GND, VBATT= VCS= 4.2V, VVADJ= VREF/2,
VISETIN= VISETOUT= VREF, RTHM= 10kΩ, TA
= -40°C to +85°C, unless otherwise noted.) (Note 7)
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
Note 1:When VISETOUT= 0, battery charger turns off.
Note 2:See Thermistorsection.
Note 3:Below this threshold, charger reverts to a prequalification mode with IBATTreduced to 10% of full scale.
Note 4:Above this threshold, charger is disabled.
Note 5:After full-charge state is complete and BATT current falls below this threshold, FULLCHGoutput switches high. Battery
charging continues until top-off timeout occurs. See Table 1.
Note 6:After charging is complete, when BATT voltage falls below this threshold, a new charging cycle is initiated.
Note 7:Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 12V, VSHDN= VVL, VCELL= GND, VBATT= VCS= 4.2V, VVADJ= VREF/2,
VISETIN= VISETOUT= VREF, RTHM= 10kΩ, TA
= -40°C to +85°C, unless otherwise noted.) (Note 7)
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
REFERENCE LOAD REGULATIONMAX1757 TOC07
REFERENCE LOAD (µA)
REFERENCE VOLTAGE (V)
TIMEOUT vs. TIMER1 CAPACITANCE
MAX1757 TOC08
CAPACITANCE (nF)
TIMEOUT (MINUTES)
FAST-CHARGE TIMEOUT
vs. TIMER2 CAPACITANCE
MAX1757 TOC09
CAPACITANCE (nF)
TIMEOUT (MINUTES)
EFFICIENCY
vs. INPUT VOLTAGE
MAX1757 TOC10
INPUT VOLTAGE (V)
EFFICIENCY (%)
VOLTAGE LIMIT
vs. VADJ VOLTAGE
MAX1757 TOC04
VADJ VOLTAGE (V)
VOLTAGE LIMIT (V)
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1757 TOC05
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
Typical Operating Characteristics(Circuit of Figure 1, VDCIN= 12V, VSHDN= VVL, VCELL= GND, VVADJ= VREF/2, VISETIN= VISETOUT= VREF, see Figure 1, TA= +25°C,
unless otherwise noted.)
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
Pin Description
MAX1757
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 14V Switch
General DescriptionThe MAX1757 includes all of the functions necessary to
charge 1, 2, or 3 Li+ battery cells in series. It includes a
step-down DC-DC converter that controls charging
voltage and current. It also includes input source cur-
rent limiting, battery temperature monitoring, battery
undervoltage precharging, battery fault indication, and
a state machine with timers for charge termination.
The DC-DC converter uses an internal power MOSFET
switch to convert the input voltage to the charging cur-
rent or voltage. Figure 1shows the typical application
circuit. Figure 2shows a typical charging sequence
and Figure 3shows the functional diagram. The charg-
ing current is set by the voltage at ISETOUT. The bat-
tery regulation voltage is measured at the BATT pin.
The battery voltage limit 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 voltage limit accu-
racy is better than 1% while using 1% setting resistors.
Figure 1. Typical Application Circuit
