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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1873 Datasheet

Simple Current-Limited Switch-Mode Li Charger Controller

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MAX1873 pdf
19-2099; Rev 0; 7/01
EVALUATION KIT AVAILABLE
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
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.
Features
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 ±0.75% 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
Ordering Information
PART
MAX1873REEE
MAX1873SEEE
MAX1873TEEE
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
VIN 9V TO
28V
(9V MIN
FOR 2-
CELLS)
4V OUT PER
200mV ON RCS
Typical Operating Circuit
SYSTEM
LOAD
VH VL
CSSP
MAX1873
DCIN
CSSN
IOUT
ICHG/EN
REF
VADJ
GND
EXT
CSB
BATT
CCI
CCS
CCV
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 www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1873 Datasheet

Simple Current-Limited Switch-Mode Li Charger Controller

No Preview Available !

MAX1873 pdf
Simple Current-Limited Switch-Mode
Li+ Charger Controller
ABSOLUTE MAXIMUM RATINGS
CSSP, CSSN, DCIN to GND ...................................-0.3V to +30V
VL Source Current ............................................................+50mA
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
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
VADJ, REF, CCI, CCV, CCS,
Junction Temperature ..................................................... +150°C
IOUT to GND.............................................-0.3V to (VL + 0.3V)
BATT, CSB to GND.................................................-0.3V to +20V
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
CSSP to CSSN.......................................................-0.3V to +0.6V
CSB to BATT..........................................................-0.3V to +0.6V
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 (200kload)
6.0V < VDCIN < 28V
IREF = 0 to 1mA
6 28 V
4 7 mA
0.1 10 µA
0.05
0.175
V
0.22 0.38 V
5.15 5.40 5.65
V
15 50 mV
4.179 4.20 4.221
V
2 6 mV
22 65 ppm/V
6 13 mV
270 300 330 kHz
47
2.5 4.5
DCIN - VH, 6V < VDCIN <28V, IVH = 0 to 20mA
4.75
5.75 V
VCSSN/VCSSP = 28V, VDCIN = 28V
70 200 µA
VDCIN = VSSN/VCSSP = 18V, VBATT = VCSB = 18V
1.5 5
µA
ICHG/EN = 0 (charger disabled)
ICHG/EN = REF (charger enabled)
0.2 1
250 500
µA
DCIN BATT (input power removed)
1.5 5
µA
2 _______________________________________________________________________________________


Part Number MAX1873
Description Simple Current-Limited Switch-Mode Li Charger Controller
Maker Maxim
Total Page 14 Pages
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