MAX1873SEEE

MAX1873SEEE Datasheet

MAX1873

Part	Datasheet
MAX1873SEEE	MAX1873SEEE (pdf)

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MAX1873 EVALUATION KIT AVAILABLE Simple Current-Limited Switch-Mode Li+ Charger Controller The low-cost MAX1873R/S/T provides all functions needed to simply and efficiently charge 2-, 3-, or 4series lithium-ion cells at up to 4A or more. It provides a regulated charging current and voltage with less than total voltage error at the battery terminals. An external P-channel MOSFET operates in a step-down DC-DC configuration to efficiently charge batteries in low-cost designs. The MAX1873R/S/T regulates the battery voltage and charging current using two control loops that work together to transition smoothly between voltage and current regulation. An additional control loop limits current drawn from the input source so that AC adapter size and cost can be minimized. An analog voltage output proportional to charging current is also supplied so that an ADC or microcontroller can monitor charging current. The MAX1873 may also be used as an efficient currentlimited source to charge NiCd or NiMH batteries in multichemistry charger designs. The MAX1873R/S/T is available in a space-saving 16-pin QSOP package. Use the evaluation kit MAX1873EVKIT to help reduce design time. Notebook Computers Portable Internet Tablets 2-, 3-, or 4-cell Li+ Battery Pack Chargers 6-, 9-, or 10-cell Ni Battery Pack Chargers Hand-Held Instruments Portable Desktop Assistants PDAs Desktop Cradle Chargers PART MAX1873REEE MAX1873SEEE MAX1873TEEE Selector Guide SERIES CELLS TO CHARGE 2-Cell Li+ or 5- or 6-cell Ni Battery 3-Cell Li+ or 7- or 9-cell Ni Battery 4-Cell Li+ 10-cell Ni Battery Packs Pin Configuration appears at end of data sheet. o Low-Cost and Simple Circuit o Charges 2-, 3-, or 4-Series Lithium-Ion Cells o AC Adapter Input-Current-Limit Loop o Also Charges Ni-Based Batteries o Analog Output Monitors Charge Current o Battery-Regulation Voltage o 5µA Shutdown Battery Current o Input Voltage Up to 28V o 200mV Dropout Voltage/100% Duty Cycle o Adjustable Charging Current o 300kHz PWM Oscillator Reduces Noise o Space-Saving 16-Pin QSOP o MAX1873 Evaluation Kit Available to Speed Designs PART MAX1873REEE MAX1873SEEE MAX1873TEEE Ordering Information TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 16 QSOP 16 QSOP 16 QSOP Typical Operating Circuit VIN 9V TO 28V 9V MIN FOR 2CELLS 4V OUT PER 200mV ON RCS VH VL CSSP MAX1873 DCIN CSSN IOUT ICHG/EN REF CSB BATT CCI VADJ CCS GND SYSTEM LOAD 2- TO 4-CELL Li+ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at MAX1873 Simple Current-Limited Switch-Mode Li+ Charger Controller ABSOLUTE MAXIMUM RATINGS CSSP, CSSN, DCIN to GND ...................................-0.3V to +30V VL, ICHG/EN to +6V VH, EXT to +0.3V VH, EXT to GND + 0.3V to -0.3V EXT to VH to -0.3V DCIN to -0.3V VADJ, REF, CCI, CCV, CCS, IOUT to VL + 0.3V BATT, CSB to +20V CSSP to +0.6V CSB to +0.6V VL Source Current VH Sink Current Continuous Power Dissipation TA = +70°C 16-Pin QSOP derate 8.3mW/°C above +70°C..........+667mW Operating Temperature Range MAX1873_EEE 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 = VCSSP = VCSSN = 18V, VICHG/EN = VREF, VVADJ = VREF/2. MAX1873R VBATT = VCSB = 8.4V MAX1873S VBATT = VCSB = 12.6V MAX1873T VBATT = VCSB = 16.8V TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted. PARAMETER INPUT SUPPLY AND REFERENCE DCIN Input Voltage Range DCIN Quiescent Supply Current DCIN to BATT Undervoltage Threshold DCIN to BATT Undervoltage Threshold VL Output Voltage VL Output Load Regulation REF Output Voltage REF Line Regulation REF Load Regulation SWITCHING REGULATOR PWM Oscillator Frequency EXT Driver Source On-Resistance EXT Driver Sink On-Resistance VH Output Voltage CSSN/CSSP Input Current CSSN/CSSP Off-State Leakage BATT, CSB Input Current BATT, CSB Input Current CONDITIONS MIN TYP MAX UNITS 6.0V < VDCIN < 28V DCIN BATT CSSP = DCIN, input falling CSSP = DCIN, input rising 6.0V < VDCIN < 28V IVL = 0 to 3mA IREF = 21µA 200kΩ load 6.0V < VDCIN < 28V IREF = 0 to 1mA 65 ppm/V DCIN - VH, 6V < VDCIN <28V, IVH = 0 to 20mA VCSSN/VCSSP = 28V, VDCIN = 28V VDCIN = VSSN/VCSSP = 18V, VBATT = VCSB = 18V ICHG/EN = 0 charger disabled ICHG/EN = REF charger enabled 250 500 DCIN BATT input power removed MAX1873 Simple Current-Limited Switch-Mode Li+ Charger Controller ELECTRICAL CHARACTERISTICS continued Circuit of Figure 1, VDCIN = VCSSP = VCSSN = 18V, VICHG/EN = VREF, VVADJ = VREF/2. MAX1873R VBATT = VCSB = 8.4V MAX1873S VBATT = VCSB = 12.6V MAX1873T VBATT = VCSB = 16.8V TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted. PARAMETER BATT Overvoltage Cutoff Threshold Battery Regulation Voltage BATT Undervoltage Threshold CURRENT SENSE CSB to BATT Battery Current-Sense Voltage CSB to BATT Current-Sense Voltage when VBATT < 2.5V per Cell CSSP to CSSN Current-Sense Voltage CONTROL INPUTS/OUTPUTS ICHG/EN Input Threshold ICHG/EN Input Voltage Range For Charge Current Adjustment VADJ Input Current ICHG/EN Input Current VADJ Input Voltage Range IOUT Voltage CONDITIONS 2-cell version MAX1873R

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MAX1873

EVALUATION KIT AVAILABLE

Simple Current-Limited Switch-Mode Li+ Charger Controller

The low-cost MAX1873R/S/T provides all functions needed to simply and efficiently charge 2-, 3-, or 4series lithium-ion cells at up to 4A or more. It provides a regulated charging current and voltage with less than total voltage error at the battery terminals. An external P-channel MOSFET operates in a step-down DC-DC configuration to efficiently charge batteries in low-cost designs.

The MAX1873R/S/T regulates the battery voltage and charging current using two control loops that work together to transition smoothly between voltage and current regulation. An additional control loop limits current drawn from the input source so that AC adapter size and cost can be minimized. An analog voltage output proportional to charging current is also supplied so that an ADC or microcontroller can monitor charging current.

The MAX1873 may also be used as an efficient currentlimited source to charge NiCd or NiMH batteries in multichemistry charger designs. The MAX1873R/S/T is available in a space-saving 16-pin QSOP package. Use the evaluation kit MAX1873EVKIT to help reduce design time.

Notebook Computers

Portable Internet Tablets
2-, 3-, or 4-cell Li+ Battery Pack Chargers
6-, 9-, or 10-cell Ni Battery Pack Chargers

Hand-Held Instruments

Portable Desktop Assistants PDAs

Desktop Cradle Chargers

PART MAX1873REEE MAX1873SEEE MAX1873TEEE

Selector Guide

SERIES CELLS TO CHARGE 2-Cell Li+ or 5- or 6-cell Ni Battery 3-Cell Li+ or 7- or 9-cell Ni Battery 4-Cell Li+ 10-cell Ni Battery Packs

Pin Configuration appears at end of data sheet.
o Low-Cost and Simple Circuit o Charges 2-, 3-, or 4-Series Lithium-Ion Cells o AC Adapter Input-Current-Limit Loop o Also Charges Ni-Based Batteries o Analog Output Monitors Charge Current o Battery-Regulation Voltage o 5µA Shutdown Battery Current o Input Voltage Up to 28V o 200mV Dropout Voltage/100% Duty Cycle o Adjustable Charging Current o 300kHz PWM Oscillator Reduces Noise o Space-Saving 16-Pin QSOP o MAX1873 Evaluation Kit Available to Speed

Designs

PART MAX1873REEE MAX1873SEEE MAX1873TEEE
Ordering Information

TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C

PIN-PACKAGE 16 QSOP 16 QSOP 16 QSOP

Typical Operating Circuit

VIN 9V TO 28V
9V MIN FOR 2CELLS
4V OUT PER 200mV ON RCS

VH VL

CSSP

MAX1873 DCIN

CSSN

IOUT

ICHG/EN

REF CSB

BATT

CCI VADJ

CCS GND

SYSTEM LOAD
2- TO 4-CELL Li+

Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at

MAX1873

Simple Current-Limited Switch-Mode Li+ Charger Controller

ABSOLUTE MAXIMUM RATINGS

CSSP, CSSN, DCIN to GND ...................................-0.3V to +30V VL, ICHG/EN to +6V VH, EXT to +0.3V VH, EXT to GND + 0.3V to -0.3V EXT to VH to -0.3V DCIN to -0.3V VADJ, REF, CCI, CCV, CCS,

IOUT to VL + 0.3V BATT, CSB to +20V CSSP to +0.6V CSB to +0.6V

VL Source Current VH Sink Current Continuous Power Dissipation TA = +70°C
16-Pin QSOP derate 8.3mW/°C above +70°C..........+667mW Operating Temperature Range

MAX1873_EEE 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 = VCSSP = VCSSN = 18V, VICHG/EN = VREF, VVADJ = VREF/2. MAX1873R VBATT = VCSB = 8.4V MAX1873S VBATT = VCSB = 12.6V MAX1873T VBATT = VCSB = 16.8V TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.

PARAMETER INPUT SUPPLY AND REFERENCE DCIN Input Voltage Range

DCIN Quiescent Supply Current

DCIN to BATT Undervoltage Threshold DCIN to BATT Undervoltage Threshold VL Output Voltage VL Output Load Regulation REF Output Voltage

REF Line Regulation

REF Load Regulation SWITCHING REGULATOR PWM Oscillator Frequency EXT Driver Source On-Resistance EXT Driver Sink On-Resistance VH Output Voltage CSSN/CSSP Input Current CSSN/CSSP Off-State Leakage

BATT, CSB Input Current

BATT, CSB Input Current

CONDITIONS

MIN TYP MAX UNITS
6.0V < VDCIN < 28V DCIN BATT CSSP = DCIN, input falling CSSP = DCIN, input rising 6.0V < VDCIN < 28V IVL = 0 to 3mA IREF = 21µA 200kΩ load
6.0V < VDCIN < 28V

IREF = 0 to 1mA
65 ppm/V

DCIN - VH, 6V < VDCIN <28V, IVH = 0 to 20mA

VCSSN/VCSSP = 28V, VDCIN = 28V

VDCIN = VSSN/VCSSP = 18V, VBATT = VCSB = 18V

ICHG/EN = 0 charger disabled ICHG/EN = REF charger enabled
250 500

DCIN BATT input power removed

MAX1873

Simple Current-Limited Switch-Mode Li+ Charger Controller

ELECTRICAL CHARACTERISTICS continued

Circuit of Figure 1, VDCIN = VCSSP = VCSSN = 18V, VICHG/EN = VREF, VVADJ = VREF/2. MAX1873R VBATT = VCSB = 8.4V MAX1873S VBATT = VCSB = 12.6V MAX1873T VBATT = VCSB = 16.8V TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.

PARAMETER BATT Overvoltage Cutoff Threshold

Battery Regulation Voltage

BATT Undervoltage Threshold CURRENT SENSE CSB to BATT Battery Current-Sense Voltage CSB to BATT Current-Sense Voltage when VBATT < 2.5V per Cell CSSP to CSSN Current-Sense Voltage CONTROL INPUTS/OUTPUTS ICHG/EN Input Threshold ICHG/EN Input Voltage Range For Charge Current Adjustment VADJ Input Current ICHG/EN Input Current VADJ Input Voltage Range

IOUT Voltage

CONDITIONS
2-cell version MAX1873R

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Datasheet ID: MAX1873SEEE 647266