System. MAX846A Datasheet

MAX846A Datasheet PDF


Part Number

MAX846A

Description

Cost-Saving Multichemistry Battery-Charger System

Manufacture

Maxim

Total Page 12 Pages
PDF Download
Download MAX846A Datasheet PDF


MAX846A Datasheet
19-1121; Rev 0; 9/96
EVAALVUAAILTAIOBNLEKIT
Cost-Saving Multichemistry
Battery-Charger System
_______________General Description
The 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.
________________________Applications
Li-Ion Battery Packs
Desktop Cradle Chargers
Li-Ion/NiMH/NiCd Multichemistry Battery
Chargers
Cellular Phones
Notebook Computers
Hand-Held Instruments
__________________Pin Configuration
TOP VIEW
DCIN 1
VL 2
CCI 3
GND 4
CCV 5
VSET 6
ISET 7
OFFV 8
MAX846A
16 DRV
15 PGND
14 CS-
13 CS+
12 BATT
11 ON
10 CELL2
9 PWROK
QSOP
____________________________Features
o Multichemistry Charger System (Li-Ion, NiMH, NiCd)
o Independent Voltage and Current Loops
o ±0.5% Internal Reference for Li-Ion Cells
o Lowers 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 MOSFET
o Space-Saving 16-Pin QSOP
o Charging-Current-Monitor Output
o <1µA Battery Drain when Off
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX846AC/D
0°C to +70°C
Dice*
MAX846AEEE
-40°C to +85°C
16 QSOP
*Dice are tested at TA = +25°C only. Contact factory for details.
__________Typical Operating Circuit
3.5V
TO
20V
DRV
CS- BATT
CS+
DCIN
MAX846A
ISET VL
CELL2
CCV
GND CCI
PGND
PWROK
ON
Li-ION
BATTERY
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

MAX846A Datasheet
Cost-Saving Multichemistry
Battery-Charger System
ABSOLUTE MAXIMUM RATINGS
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
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
(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.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VL REGULATOR
DCIN Supply Current
Operating Range
VDCIN = 20V, IDRV = IVL = 0mA
5 mA
3.7 20.0 V
Output Voltage
Short-Circuit Current Limit
0mA < IVL < 20mA, 3.7V < VDCIN < 20V
VL = GND
3.267
3.305
50
3.333
V
mA
PWROK Trip Level
Rising VL edge, 2% hysteresis
2.9 3.0 3.1
V
VL Undervoltage-Lockout Level
2.5 2.9 V
REFERENCE
Output Voltage
Output Resistance
CURRENT-SENSE AMPLIFIER
Measured at VSET, IVSET = 0mA, VON = 0V
-0.5% 1.650 +0.5%
-2% 20 +2%
V
k
Transconductance
Output Offset Current
Input Common-Mode Range
VISET = 1.7V, VCS+ - VCS- = 165mV
VCS+ = 4V
Measured at VCS-, VCS+ - VCS- = 165mV
0.95 1 1.05 mA/V
3 µA
2.1 20.0 V
Maximum Differential Input Voltage
VCS- = VISET = 2.1V,
CSA transconductance >0.9mA/V
225
mV
CS- Lockout Voltage
CS+, CS- Input Current
CS+, CS- Off Input Current
When VCS- is less than this voltage, DRV is
disabled.
VCS+ = 20V, VCS+ -VCS- = 165mV
DCIN = VL = ON = GND
1.9 2.1
250
0.01 10
V
µA
µA
2 _______________________________________________________________________________________


Features Datasheet pdf 19-1121; Rev 0; 9/96 KIT ATION EVALU E L B A AVAIL Cost-Saving Multichemistry Battery-Charger System _______________ _____________Features o o o o Multichem istry Charger System (Li-Ion, NiMH, NiC d) Independent Voltage and Current Loop s ±0.5% Internal Reference for Li-Ion Cells Lowers Cost: —Stands Alone or U ses Low-Cost µC —Built-In 1% Linear Regulator Powers µC —Linear Regulato r Provides Reference to µC ADCs —Bui lt-In µC Reset —Controls Low-Cost Ex ternal PNP Transistor or P-Channel MOSF ET o Space-Saving 16-Pin QSOP o Chargin g-Current-Monitor Output o <1µA Batter y Drain when Off _______________Genera l Description The MAX846A is a cost-sav ing multichemistry batterycharger syste m that comes in a space-saving 16-pin Q SOP. This integrated system allows diff erent battery chemistries (Li-Ion, NiMH or NiCd cells) to be charged using one circuit. In its simplest application, the MAX846A is a standalone, current-li mited float voltage source that charges Li-Ion cells. It can also be paired up .
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