MAX846AEEE Datasheet Download

Part No.:
MAX846AEEE
Download:
Download Datasheet
Description:
[Cost-Saving Multichemistry Battery-Charger System]
File Size:
108 K
Page:
12 Pages
Logo:
Manufacturer:
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
PCB Prototype
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19-1121; Rev 0; 9/96
KIT
ATION
EVALU
BLE
AVAILA
Cost-Saving Multichemistry
Battery-Charger System
____________________________Features
o
o
o
o
Multichemistry Charger System (Li-Ion, NiMH, NiCd)
Independent Voltage and Current Loops
±0.5% Internal Reference for Li-Ion Cells
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
_______________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.
MAX846A
______________Ordering Information
PART
MAX846AC/D
MAX846AEEE
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
16 QSOP
________________________Applications
Li-Ion Battery Packs
Desktop Cradle Chargers
Li-Ion/NiMH/NiCd Multichemistry Battery
Chargers
Cellular Phones
Notebook Computers
Hand-Held Instruments
*Dice are tested at T
A
= +25°C only. Contact factory for details.
__________Typical Operating Circuit
3.5V
TO
20V
__________________Pin Configuration
TOP VIEW
DCIN 1
VL 2
CCI 3
GND 4
CCV 5
VSET 6
ISET 7
OFFV 8
16 DRV
15 PGND
14 CS-
DRV
CS-
CS+
DCIN
ISET
CELL2
GND
PGND
BATT
Li-ION
BATTERY
MAX846A
MAX846A
13 CS+
12 BATT
11 ON
10 CELL2
9
PWROK
VL
CCV
CCI
PWROK
ON
QSOP
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800