MAX1873REEE+-MAX1873REEE+T-MAX1873SEEE+T-MAX1873SEEE-T-MAX1873TEEE+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX1873REEE+-MAX1873REEE+T-MAX1873SEEE+T-MAX1873SEEE-T-MAX1873TEEE+T
Simple Current-Limited Switch-Mode Li+ Charger Controller
General Description
The low-cost MAX1873R/S/T provides all functions
needed to simply and efficiently charge 2-, 3-, or 4-
series lithium-ion cells at up to 4A or more. It provides a
regulated charging current and voltage with less than
±0.75% 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 cur-
rent drawn from the input source so that AC adapter
size and cost can be minimized. An analog voltage out-
put 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 current-
limited source to charge NiCd or NiMH batteries in mul-
tichemistry 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.
Applications
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
FeaturesLow-Cost and Simple CircuitCharges 2-, 3-, or 4-Series Lithium-Ion CellsAC Adapter Input-Current-Limit LoopAlso Charges Ni-Based BatteriesAnalog Output Monitors Charge Current±0.75% Battery-Regulation Voltage5µA Shutdown Battery CurrentInput Voltage Up to 28V200mV Dropout Voltage/100% Duty CycleAdjustable Charging Current300kHz PWM Oscillator Reduces NoiseSpace-Saving 16-Pin QSOPMAX1873 Evaluation Kit Available to Speed
Designs
MAX1873
Simple Current-Limited Switch-Mode
Li+ Charger Controller
Ordering Information
19-2099; Rev 0; 7/01
EVALUATION KIT AVAILABLE
PARTTEMP. RANGEPIN-PACKAGE
MAX1873REEE-40°C to +85°C16 QSOP
MAX1873SEEE-40°C to +85°C16 QSOP
MAX1873TEEE-40°C to +85°C16 QSOP
Selector Guide
PARTSERIES CELLS TO CHARGE
MAX1873REEE2-Cell Li+ or 5- or 6-cell Ni Battery
MAX1873SEEE3-Cell Li+ or 7- or 9-cell Ni Battery
MAX1873TEEE4-Cell Li+ 10-cell Ni Battery Packs
MAX1873
GND
VADJ
REF
ICHG/EN
IOUT
DCINVLCSSP
CSSN
SYSTEM
LOADVIN 9V TO
28V
(9V MIN
FOR 2-
CELLS)
4V OUT PER
200mV ON RCS
EXT
BATT
CSB
CCI
CCS
CCV
2- TO 4-CELL
Li+
Typical Operating Circuit
Pin Configuration appears at end of data sheet.
MAX1873
Simple Current-Limited Switch-Mode
Li+ Charger Controller
ABSOLUTE MAXIMUM RATINGS
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.)
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
VL, ICHG/EN to GND................................................-0.3V to +6V
VH, EXT to DCIN.......................................................-6V to +0.3V
VH, EXT to GND......................................(VDCIN+ 0.3V) to -0.3V
EXT to VH.................................................................+6V to -0.3V
DCIN to VL..............................................................+30V to -0.3V
VADJ, REF, CCI, CCV, CCS,
IOUT to GND.............................................-0.3V to (VL + 0.3V)
BATT, CSB to GND.................................................-0.3V to +20V
CSSP to CSSN.......................................................-0.3V to +0.6V
CSB to BATT..........................................................-0.3V to +0.6V
VL Source Current............................................................+50mA
VH Sink Current................................................................+40mA
Continuous Power Dissipation (TA= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C..........+667mW
Operating Temperature Range
MAX1873_EEE................................................-40°C to +85°C
Junction Temperature.....................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s)................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
INPUT SUPPLY AND REFERENCE
DCIN Input Voltage Range628V
6.0V < VDCIN < 28V47mAD C IN Qui escent S up p l y C ur r entDCIN ≤ BATT0.110µA
DCIN to BATT Undervoltage ThresholdCSSP = DCIN, input falling0.050.175V
DCIN to BATT Undervoltage ThresholdCSSP = DCIN, input rising0.220.38V
VL Output Voltage6.0V < VDCIN < 28V5.155.405.65V
VL Output Load RegulationIVL = 0 to 3mA1550mV
REF Output VoltageIREF = 21µA (200kΩ load)4.1794.204.221VmVREF Line Regulation6.0V < VDCIN < 28V2265ppm/V
REF Load RegulationIREF = 0 to 1mA613mV
SWITCHING REGULATOR
PWM Oscillator Frequency270300330kHz
EXT Driver Source On-Resistance47Ω
EXT Driver Sink On-Resistance2.54.5Ω
VH Output VoltageDCIN - VH, 6V < VDCIN <28V, IVH = 0 to 20mA4.755.75V
CSSN/CSSP Input CurrentVCSSN/VCSSP = 28V, VDCIN = 28V70200µA
CSSN/CSSP Off-State LeakageVDCIN = VSSN/VCSSP = 18V, VBATT = VCSB = 18V1.55µA
ICHG/EN = 0 (charger disabled)0.21BATT, CSB Input CurrentICHG/EN = REF (charger enabled)250500µA
BATT, CSB Input CurrentDCIN ≤ BATT (input power removed)1.55µA
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.)
PARAMETERCONDITIONSMINTYPMAXUNITS
2-cell version MAX1873R10.451111.55
3-cell version MAX1873S15.67516.517.325BATT Overvoltage Cutoff Threshold
4-cell version MAX1873T (Note 1)17.57518.519.425
VVADJ = 07.8987.9588.018
VVADJ = VREF/28.3378.48.463MAX1873R
(2 Li+ cells)
VVADJ = VREF (Note 1)8.7758.8428.909
VVADJ = 011.84711.93712.027
VVADJ = VREF/212.50512.612.695MAX1873S
(3 Li+ cells)
VVADJ = VREF (Note 1)13.16313.26313.363
VVADJ = 015.79615.91616.036
VVADJ = VREF/216.67416.816.926
Battery Regulation Voltage
MAX1873T
(4 Li+ cells)
VVADJ = VREF (Note 1)17.55117.68417.817
MAX1873R4.85.05.2
MAX1873S7.27.57.8BATT Undervoltage ThresholdFor ICHG/20 trickle
charge
MAX1873T9.61010.4
CURRENT SENSE
VICHG/EN = VREF190200210CSB to BATT Battery Current-Sense
VoltageVICHG/EN = VREF/4405060mV
CSB to BATT Current-Sense Voltage
when VBATT < 2.5V per Cell51015mV
CSSP to CSSN Current-Sense Voltage6V < VCSSP < 28V90100110mV
CONTROL INPUTS/OUTPUTS
ICHG/EN Input ThresholdIncludes 50mV of hysteresis500600700mV
ICHG/EN Input Voltage Range For
Charge Current Adjustment700VREFmV
VADJ Input CurrentVVADJ = VREF/2-100100nA
ICHG/EN Input CurrentVICHG/EN = VREF-100100nA
VADJ Input Voltage Range0VREFV
Full scaleVCSB - VBATT = 200mV,
0 < IOUT < 500µA3.64.04.4
25% scaleVCSB - VBATT = 50mV,
0 < IOUT < 500µA0.91.01.1
Trickle chargeVCSB - VBATT = 10mV75200325
IOUT Voltage
No charge
current
VCSB - VBATT = 0,
IIOUT = sinking 20µA407090mV
MAX1873
Simple Current-Limited Switch-Mode
Li+ Charger Controller
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= -40°C to +85°C. Typical values are at TA= +25°C,
unless otherwise noted.)
PARAMETERCONDITIONSMINMAXUNITS
INPUT SUPPLY AND REFERENCE
DCIN Input Voltage Range628V
6.0V < VDCIN < 28V7mAD C IN Qui escent S up p l y C ur r entDCIN ≤ BATT10µA
DCIN to BATT Undervoltage ThresholdCSSP = DCIN, input falling0.050.2V
DCIN to BATT Undervoltage ThresholdCSSP = DCIN, input rising0.220.38V
VL Output Voltage6.0V < VDCIN < 28V5.155.65V
VL Output Load RegulationIVL = 0 to 3mA50mV
REF Output VoltageIREF = 21µA (200kΩ load)4.1794.221V
6mVREF Line Regulation6.0V < VDCIN < 28V65ppm/V
REF Load RegulationIREF = 0 to 1mA13mV
SWITCHING REGULATOR
PWM Oscillator Frequency270330kHz
EXT Driver Source On-Resistance7Ω
EXT Driver Sink On-Resistance4.5Ω
VH Output VoltageDCIN - VH, 6V < VDCIN <28V, IVH = 0 to 20mA4.755.75V
CSSN/CSSP Input CurrentVCSSN/VCSSP = 28V, VDCIN = 28V200µA
CSSN/CSSP Off-State LeakageVDCIN = VSSN/VCSSP = 18V VBATT = VCSB = 18V5µA
ICHG/EN = 0 (charger disabled)1BATT, CSB Input CurrentICHG/EN = REF (charger enabled)500µA
BATT, CSB Input CurrentDCIN ≤ BATT (input power removed)5µA
2-cell version MAX1873R10.4511.55
3-cell version MAX1873S15.67517.325BATT Overvoltage Cutoff Threshold
4-cell version MAX1873T (Note 1)17.57519.425
VVADJ = 07.8988.018
VVADJ = VREF/28.3378.463MAX1873R
(2 Li+ cells)
VVADJ = VREF (Note 1)8.7758.909
VVADJ = 011.84712.027
VVADJ = VREF/212.50512.695MAX1873S
(3 Li+ cells)
VVADJ = VREF (Note 1)13.16313.363
VVADJ = 015.79616.036
VVADJ = VREF/216.67416.926
Battery Regulation Voltage
MAX1873T
(4 Li+ cells)
VVADJ = VREF (Note 1)17.55117.817
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= -40°C to +85°C. Typical values are at TA= +25°C,
unless otherwise noted.)
PARAMETERCONDITIONSMINMAXUNITS
MAX1873R4.85.2
MAX1873S7.27.8BATT Undervoltage ThresholdFor ICHG/20 trickle
charge
MAX1873T9.610.4
CURRENT SENSE
VICHG/EN = VREF190210mVCSB to BATT Battery Current-Sense
VoltageVICHG/EN = VREF/44060mV
CSB to BATT Current-Sense Voltage
when VBATT < 2.5V per Cell515mV
CSSP to CSSN Current-Sense Voltage6V < VCSSP < 28V90110mV
CONTROL INPUTS/OUTPUTS
ICHG/EN Input ThresholdIncludes 50mV of hysteresis500700mV
ICHG/EN Input Voltage Range for
Charge Current Adjustment700VREFmV
VADJ Input CurrentVVADJ = VREF/2-100100nA
ICHG/EN Input CurrentVICHG/EN = VREF-100100nA
VADJ Input Voltage Range0VREFV
Full scaleVCSB - VBATT = 200mV,
0 < IOUT < 500µA3.64.4
25% scaleVCSB - VBATT = 50mV,
0 < IOUT < 500µA0.91.1
Trickle chargeVCSB - VBATT = 10mV75325
IOUT Voltage
No charge
current
VCSB - VBATT = 0,
IIOUT = sinking 20µA4090mV
Note 1:While it may appear possible to set the Battery Regulation Voltage higher than the Battery Overvoltage Cutoff Threshold, this
cannot happen because both parameters are derived from the same reference and track each other.
Note 2:Specifications to -40°C are guaranteed by design, not production tested.
MAX1873
Simple Current-Limited Switch-Mode
Li+ Charger Controller
Typical Operating 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= +25°C, unless otherwise noted).
MAX1873T (4-CELL)
BATTERY VOLTAGE vs. CHARGING CURRENT
MAX1873 toc01
CHARGING CURRENT (A)
BATTERY VOLTAGE (V)
RCSB + 0.068Ω
IOUT VOLTAGE
vs. CSB-BATT VOLTAGE
MAX1873 toc02
CSB-BATT VOLTAGE (mV)
IOUT VOLTAGE (V)
RECENT VOLTAGE VS. TEMPERATURE
MAX1873 toc04
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
MAX1873T
MAX1873T (4-CELL)
BATTERY REGULATION VOLTAGE
vs. VADJ VOLTAGE
MAX1873 toc03
VADJ VOLTAGE (V)
BATTERY REGULATION VOLTAGE (V)
RECENT VOLTAGE
VS. REFERENCE CURRENT
MAX1873 toc05
REFERENCE VOLTAGE (V)
MAX1873T
MAX1873R (2-CELL)
EFFICIENCY vs. INPUT VOLTAGE
MAX1873 toc06
EFFICIENCY (%)
VBATT = 7V
ICHG = 3A
MAX1873
Simple Current-Limited Switch-Mode
Li+ Charger Controller
MAX1873S (3-CELL)
EFFICIENCY vs. INPUT VOLTAGE
MAX1873 toc07
INPUT VOLTAGE (V)
EFFICIENCY (%)20162428
VBATT = 10.5V
ICHG = 3A
MAX1873T (4-CELL)
EFFICIENCY vs. INPUT VOLTAGE
MAX1873 toc08
INPUT VOLTAGE (V)
EFFICIENCY (%)
VBATT = 14V
ICHG + 3A
CHARGING CURRENT
vs. SYSTEM LOAD CURRENT
MAX1873 toc10
SYSTEM LOAD CURRENT (A)
CHARGING CURRENT (A)
4-CELL BATTERY VOLTAGE AND
CHARGING CURRENT vs. TIME
MAX1873 toc09
TIME (MINUTES)
BATTERY VOLTAGE (V)
BATTERY VOLTAGE
CHARGING CURRENT
CHARGING CURRENT (A)
Typical Operating 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= +25°C, unless otherwise noted).

Partno	Mfg	Dc	Qty	Available	Descript
MAX1873REEE+ \|MAX1873REEE	MAX	N/a	12	avai	Simple Current-Limited Switch-Mode Li+ Charger Controller
MAX1873REEE+T	MAXIM	N/a	6499	avai	Simple Current-Limited Switch-Mode Li+ Charger Controller
MAX1873SEEE+T \|MAX1873SEEET	MAXIM	N/a	14069	avai	Simple Current-Limited Switch-Mode Li+ Charger Controller
MAX1873SEEE-T \|MAX1873SEEET	MAXIM	N/a	1694	avai	Simple Current-Limited Switch-Mode Li+ Charger Controller
MAX1873TEEE+T \|MAX1873TEEET	MAXIM	N/a	12500	avai	Simple Current-Limited Switch-Mode Li+ Charger Controller