MAX846AEEE ,Cost-Saving Multichemistry Battery-Charger SystemMAX846A19-1121; Rev 0; 9/96Cost-Saving MultichemistryBattery-Charger System_______________
MAX846AEEE ,Cost-Saving Multichemistry Battery-Charger SystemELECTRICAL CHARACTERISTICS(V = 10V, ON = VL, I = I = 0mA, V - = V = 10V, V = 4.5V, V = V = 0V, T = ..
MAX846AEEE ,Cost-Saving Multichemistry Battery-Charger SystemFeaturesThe MAX846A is a cost-saving multichemistry battery- ' Multichemistry Charger System (Li-Io ..
MAX846AEEE ,Cost-Saving Multichemistry Battery-Charger SystemApplications*Dice are tested at T = +25°C only. Contact factory for details.ALi-Ion Battery PacksDe ..
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MAX847EEI ,1-Cell / Step-Up Two-Way Pager System ICELECTRICAL CHARACTERISTICS(OUT = 3.0V, BATT = 1.2V, NICD = 3.6V, T = -40°C to +85°C, unless otherwi ..
MB81C81A-35 ,CMOS 256K-BIT HIGH-SPEED SRAMMay 1990 00
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M38 1 C8 1A-25/-35
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256K Words ..
MB81F643242C-10FN ,4 x 512K x 32 bit synchronous dynamic RAMFUJITSU SEMICONDUCTORADVANCED INFO. AE0.1EDATA SHEETMEMORYCMOS4 · 512 K · 32 BITSYNCHRONOUS DYNAMIC ..
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MB81N643289-60FN ,8 x 256K x 32 bit double data rate FCRAMapplications where large memory density and high effective bandwidth arerequired and where a simple ..
MB8264A-10 , MOS 65536-BIT DYNAMIC RANDOM ACCESS MEMORY
MB8264A-10 , MOS 65536-BIT DYNAMIC RANDOM ACCESS MEMORY
MAX846AEEE
Cost-Saving Multichemistry Battery-Charger System
_______________General DescriptionThe MAX846A is a cost-saving multichemistry battery-
charger system that comes in a space-saving 16-pin
QSOP. This integrated system allows different battery
chemistries (Li-Ion, NiMH or NiCd cells) to be charged
using one circuit.
In its simplest application, the MAX846A is a stand-
alone, current-limited float voltage source that charges
Li-Ion cells. It can also be paired up with a low-cost
microcontroller (µC) to build a universal charger capa-
ble of charging Li-Ion, NiMH, and NiCd cells.
An internal 0.5%-accurate reference allows safe charg-
ing of Li-Ion cells that require tight voltage accuracy.
The voltage- and current-regulation loops used to con-
trol a low-cost external PNP transistor (or P-channel
MOSFET) are independent of each other, allowing more
flexibility in the charging algorithms.
The MAX846A has a built-in 1%, 3.3V, 20mA linear regu-
lator capable of powering the µC and providing a refer-
ence for the µC’s analog-to-digital converters. An
on-board reset notifies the controller upon any unex-
pected loss of power. The µC can be inexpensive, since
its only functions are to monitor the voltage and current
and to change the charging algorithms.
________________________ApplicationsLi-Ion Battery Packs
Desktop Cradle Chargers
Li-Ion/NiMH/NiCd Multichemistry Battery
Chargers
Cellular Phones
Notebook Computers
Hand-Held Instruments
____________________________FeaturesMultichemistry Charger System (Li-Ion, NiMH, NiCd)Independent Voltage and Current Loops±0.5% Internal Reference for Li-Ion CellsLowers Cost:
—Stands Alone or Uses Low-Cost µC
—Built-In 1% Linear Regulator Powers µC
—Linear Regulator Provides Reference to µC ADCs
—Built-In µC Reset
—Controls Low-Cost External PNP Transistor or
P-Channel MOSFETSpace-Saving 16-Pin QSOPCharging-Current-Monitor Output<1µA Battery Drain when Off
MAX846A
Cost-Saving Multichemistry
Battery-Charger System
__________Typical Operating Circuit19-1121; Rev 0; 9/96
*Dice are tested at TA= +25°C only. Contact factory for details.
______________Ordering Information
MAX846A
Cost-Saving Multichemistry
Battery-Charger System
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDCIN= 10V, ON = VL, IVL= IVSET= 0mA, VCS- = VCS+= 10V, VBATT= 4.5V, VOFFV= VCELL2= 0V, 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, DRV, CS+, CS-, BATT to GND........................-0.3V, +21V
PGND to GND.....................................................................±0.3V
VL to GND......................................................................-0.3V, 7V
IPWROK................................................................................10mA
PWROK, ISET, CCI, CCV, OFFV, VSET,
CELL2, ON to GND............................................-0.3V, VL + 0.3V
CS+ to CS-..........................................................................±0.3V
VL Short to GND.........................................................Continuous
IDRV...................................................................................100mA
Continuous Power Dissipation (TA= +70°C)
QSOP (derate 8.3mW/°C above +70°C)........................667mW
Operating Temperature Range
MAX846AEEE....................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX846A
Cost-Saving Multichemistry
Battery-Charger System
ELECTRICAL CHARACTERISTICS (continued)(VDCIN= 10V, ON = VL, IVL= IVSET= 0mA, VCS- = VCS+= 10V, VBATT= 4.5V, VOFFV= VCELL2= 0V, TA= 0°C to +85°C, unless
otherwise noted. Typical values are at TA= +25°C.)
MAX846A
Cost-Saving Multichemistry
Battery-Charger System
ELECTRICAL CHARACTERISTICS (Note 1)(VDCIN= 10V, ON = VL, IVL= IVSET= 0mA, VCS- = VCS+= 10V, VBATT= 4.5V, VOFFV= VCELL2= 0V, TA= -40°C to +85°C, unless
otherwise noted.)
Note 1:Specifications to -40°C are guaranteed by design and not production tested.
MAX846A
Cost-Saving Multichemistry
Battery-Charger SystemCURRENT-SENSE AMPLIFIER
TRANSCONDUCTANCE vs. ISET VOLTAGE
MAX846-01
ISET VOLTAGE (V)
CSA GM (mA/V)
BATTERY INPUT CURRENT
vs. BATTERY VOLTAGE
MAX846-02
BATT VOLTAGE (V)
BATT INPUT CURRENT (15937
-12010k100k1k1001M
CURRENT-LOOP GAINMAX846-03
FREQUENCY (Hz)
GAIN (dB)
PHASE (DEGREES)
--12010k100k1k1001M
VOLTAGE-LOOP GAINMAX846-04
FREQUENCY (Hz)
GAIN (dB)
PHASE (DEGREES)
Li-ION CHARGING PROFILE
MAX846-04
TIME (MINUTES)
CHARGING CURRENT (mA)
BATTERY VOLTAGE (V)
__________________________________________Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
MAX846A
Cost-Saving Multichemistry
Battery-Charger System
______________________________________________________________Pin Description
_______________Detailed DescriptionThe MAX846A battery-charging controller combines
three functional blocks: a 3.3V precision, low-dropout
linear regulator (LDO), a precision voltage reference,
and a voltage/current regulator (Figure 1).
Linear RegulatorThe LDO regulator output voltage (VL) is two times the
internal reference voltage; therefore, the reference and
LDO track. VL delivers up to 20mA to an external load
and is short-circuit protected. The power-good output
(PWROK) provides microcontroller (µC) reset and
charge-current inhibition.
Voltage ReferenceThe precision internal reference provides a voltage to
accurately set the float voltage for lithium-ion (Li-Ion)
battery charging. The reference output connects in
series with an internal, 2%-accurate, 20kΩresistor. This
allows the float voltage to be adjusted using one exter-
nal 1% resistor (RVSET) to form a voltage divider
(Figure 4). The float-voltage accuracy is important for
battery life and to ensure full capacity in Li-Ion batter-
ies. Table 1 shows the accuracies attainable using the
MAX846A.
