AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02
ANALOG INTEGRATIONS CORPORATION www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 1
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FEATURES
tensans Reliable Fast Charge Control of NiMH/NiCd Bat-
teries.
tensans Quick and Easy Testing for Production.
tensans Fast Charge Termination by:
1. Accurate -∆V Detection Level with Respect to
Peak Battery Voltage Value.
AIC1761 ................……………........ -1%
AIC1766 ............…………..……...... -0.25%
2. Peak Voltage Timer (0∆V).
tensans Adjustable Fast Charge Safety Timer.
tensans Protection against Temperature Fault.
tensans Protection against Short-Circuited and Open Bat-
teries.
tensans Wide Operation Voltage Range: 9V to 18V, no Ex-
tra Regulator Needed.
tensans Large Battery Voltage Detection Range: 0.65V to
3.7V.
tensans LED Drivers to Indicate Charge Status or Fault
Conditions.
tensans Voltage Reference Output.
tensans Space-Saving Packages:
8-PIN DIP, SO
14-PIN DIP, SO

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APPLICATIONS
Battery Chargers for :
tensans Mobile Phones
tensans Notebook and Laptop Personal Computers
tensans Portable Power Tools and Toys
tensans Portable Communication Equipments
tensans Portable Video and Stereo Equipments
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DESCRIPTION
The AIC1761/1766 fast charge controller IC is
designed for intelligent charging of NiMH or NiCd
batteries without overcharging. It detects a voltage
drop (-∆V) 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∆V).
The detection of -∆V is a very reliable method to
terminate fast charging for NiMH and NiCd batter-
ies. The AIC1761/1766 uses -∆V detection as one
of primary decisions for fast charge cut-off. The -
∆V value for the AIC1761 is as small as 16mV per
cell, suitable for NiCd batteries. The
-∆V value for the AIC1766 is as small as 4mV per
cell, particularly suitable for NiMH as well as the
NiCd batteries. The peak voltage timer is particu-
larly 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 ad-
justable safety timer (3 settings) is used as a back-
up termination method. Provisions are made with
the AIC1761/1766 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 dramati-
cally reduce production test time.