BATTERY
CHARGE CONTROLLER
Janaury 30, 1998
SC1766
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1766 fast charge controller IC is designed for
intelligent charging of NiMH or NiCd batteries without
overcharging. It detects a voltage drop (-鈭哣) occurring
in the final stage of a fast charging cycle and
correspondingly controls the charging current. Fast
charge can also be cut off by a peak voltage timer
(0鈭哣).
The detection of -鈭哣 is a very reliable method to
terminate fast charging for NiMH and NiCd batteries.
The SC1766 uses -鈭哣 detection as one of the primary
decisions for fast charge cut-off. The -鈭哣 value of the
SC1766 is as small as 4mV per cell, particularly
suitable for NiMH as well as NiCd batteries. The peak
voltage timer is particularly useful when the voltage
drop at the end of charge for some batteries, e.g.
NiMH cells, is not pronounced enough for reliable
detection. An adjustable safety timer (3 settings) is
used as a backup termination method. Provisions are
made with the SC1766 to prevent fast charge under
temperature fault conditions. Two LED outputs are
used to indicate the charging status. Another flash LED
output can be used alone to indicate charge status.
AC mode allows the battery to drive its loads while
being charged. Test mode is provided to dramatically
reduce production test time.
FEATURES
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Reliable fast charge control of NiMH/NiCd
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batteries
Fast charge termination by:
1 Accurate -鈭哣 detection level -0.25% with
respect to peak value
2 Peak voltage timer (0鈭哣)
Adjustable fast charge safety timer
Protection against temperature fault
Protection against short-circuited and open
batteries
Wide operation voltage range of 9V to 18V, no
extra regulator needed
Large battery voltage detection range of 0.65V to
3.7V
LED drivers to indicate charge status or fault
conditions
Voltage reference output
Quick and easy testing for production
Space saving 8-pin and 14-pin SO packages
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ORDERING INFORMATION
DEVICE
(1)
PACKAGE
SO-8
SO-14
SC1766CS08
SC1766CS14
Note:
(1) Add suffix 鈥楾R鈥?for tape and reel.
APPLICATIONS
Battery chargers for:
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Mobile phones
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Notebook and laptop personal computers
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Portable power tools and toys
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Portable communications equipment
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Portable video and stereo equipment
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
DC Voltage Applied
to any Pin
Sink Current of V
OUT
pin, LED pin, and
FLASH pin
Operating
Temperature Range
Storage
Temperature Range
T
A
T
STG
Symbol
V
CC
Maximum
18
18
Units
V
V
20
mA
0 to 70
-65 to 150
擄C
擄C
漏 1997 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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