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 ..
MAX1759EUB+T ,Buck/Boost Regulating Charge Pump in µMAXApplications MAX1759EUB -40°C to +85°C 10 µMAXMiniature EquipmentBackup Battery Boost ConvertersTra ..
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, ..
MAX4583CSE+ ,Low-Voltage, CMOS Analog Multiplexers/SwitchesMAX4581/MAX4582/MAX458319-1328; Rev 6; 3/12Low-Voltage, CMOS AnalogMultiplexers/Switches___________ ..
MAX1758EAI
Stand-Alone, Switch-Mode Li Battery Charger with Internal 28V Switch
General DescriptionThe 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.
________________________Applications
FeaturesStand-Alone Charger for Up to 4 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 28VUp to 1.5A Programmable Charge CurrentSafety Timer Prevents OverchargingInput Current LimitingSpace-Saving 28-Pin SSOP300kHz PWM Oscillator Reduces Noise
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
Ordering InformationLi+ Battery Packs
Notebook Computers
Hand-Held Instruments
Desktop Cradle Chargers
Pin Configuration
Typical Operating Circuit
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 18V, 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.
DCIN, CSSP, CSSN, HSD to GND..........................-0.3V to +30V
CSSP to CSSN.......................................................-0.6V to +0.6V
BST to GND............................................................-0.3V to +36V
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
BATT, CS to GND...................................................-0.3V to +20V
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.........................................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 18V, 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.)
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 18V, 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.)
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 18V, 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= 18V, 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)
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VDCIN= VHSD= VCSSP= VCSSN= 18V, 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)
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 peak inductor 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.
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
TIMEOUT vs. TIMER1 CAPACITANCEMAX1758 TOC08
CAPACITANCE (nF)
TIMEOUT (MINUTES)
FAST-CHARGE TIMEOUT
vs. TIMER2 CAPACITANCE
MAX1758 TOC09
CAPACITANCE (nF)
TIMEOUT (MINUTES)
EFFICIENCY vs. INPUT VOLTAGE
MAX1758 TOC10
INPUT VOLTAGE (V)
EFFICIENCY (%)
BATTERY VOLTAGE
vs. CHARGING CURRENT
MAX1758 TOC01
CHARGING CURRENT (A)
BATTERY VOLTAGE (V)
CHARGING CURRENT
vs. ISETOUT VOLTAGE
MAX1758 TOC02
ISETOUT VOLTAGE (V)
CHARGING CURRENT (A)
INPUT CURRENT-SENSE REGULATION
VOLTAGE vs. ISETIN VOLTAGE
MAX1758 TOC03
ISETIN VOLTAGE (V)
INPUT CURRENT-SENSE VOLTAGE (mV)
VOLTAGE LIMIT
vs. VADJ VOLTAGE
MAX1758 TOC04
VADJ VOLTAGE (V)
VOLTAGE LIMIT (V)
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1758 TOC05
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
REFERENCE LOAD REGULATION
MAX1758 TOC07
REFERENCE LOAD (µA)
REFERENCE VOLTAGE (V)
Typical Operating Characteristics(Circuit of Figure 1, VDCIN= 18V, VSHDN= VVL, VCELL= GND, VVADJ= VREF/2, VISETIN= VISETOUT= VREF, TA= +25°C, unless oth-
erwise noted.)
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
Pin Description
MAX1758
Stand-Alone, Switch-Mode
Li+ Battery Charger with Internal 28V Switch
Detailed DescriptionThe MAX1758 includes all of the functions necessary to
charge 1, 2, 3, or 4 Li+ battery cells in series. It
includes a step-down DC-DC converter that controls
charging voltage and current. It also includes input
source current limiting, battery temperature monitoring,
battery undervoltage precharging, battery fault indica-
tion, and a state machine with timers for charge termi-
nation.
The DC-DC converter uses an internal power MOSFET
switch to convert the input voltage to the charging cur-
rent or voltage. Figure 1 shows the typical application
circuit. Figure 2 shows a typical charging sequence and
Figure 3 shows the functional diagram. The charging
current is set by the voltage at ISETOUT. The battery
voltage is measured at the BATT pin. The battery regu-
lation 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 accuracy is
better than 1% while using 1% setting resistors.
Figure 1. Typical Application Circuit
