MAX1667 Datasheet, PDF (1/28 Pages) Maxim Integrated Products – Chemistry-Independent, Level 2 Smart Battery Charger

19-1488; Rev 0; 7/99
Chemistry-Independent,
Level 2 Smart Battery Charger
General Description
The MAX1667 provides the power control necessary to
charge batteries of any chemistry. All charging functions
are controlled through the Intel System Management Bus
(SMBus™) interface. The SMBus 2-wire serial interface
sets the charge voltage and current and provides thermal
status information. The MAX1667 functions as a Level 2
charger, compliant with the Duracell/Intel Smart Battery
Charger Specification.
In addition to the feature set required for a Level 2 charg-
er, the MAX1667 generates interrupts to signal the host
when power is applied to the charger or when a battery is
installed or removed. Additional status bits allow the host
to check whether the charger has enough input voltage,
and whether the voltage on or current into the battery is
being regulated. This allows the host to determine when
lithium-ion (Li+) batteries have completed the charge with-
out interrogating the battery.
The MAX1667 is available in a 20-pin SSOP with a 2mm
profile height.
________________________Applications
Notebook Computers
Charger Base Stations
Personal Digital Assistants Phones
Pin Configuration appears at end of data sheet.
____________________________Features
o Charges Any Battery Chemistry: Li+, NiCd,
NiMH, Lead Acid, etc.
o SMBus 2-Wire Serial Interface
o Compliant with Duracell/Intel Smart Battery
Charger Specification Rev. 1.0
o 4A, 3A, or 1A (max) Battery Charge Current
o 5-Bit Control of Charge Current
o Up to 18.4V Battery Voltage
o 11-Bit Control of Voltage
o ±1% Voltage Accuracy
o Up to +28V Input Voltage
o Battery Thermistor Fail-Safe Protection
o Greater than 95% Efficiency
o Synchronous Rectifier
Ordering Information
PART
MAX1667EAP
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
20 SSOP
Typical Operating Circuit
CHARGE SOURCE
DCIN
REF
AGND
SEL
DACV
IOUT
VL
BST
DHI
LX
DLO
PGND
INT
CCV
CS
MAX1667
BATT
SCL
SDA
CCI
THM
RSENSE
VDD
HOST
CONTROLLER
SCL
SDA
INT
GND
BATT+
SCL _SMART
SDA _BATTERY
TEMP
BATT-
SMBus is a trademark of Intel Corp.
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