AIC1761CN08-AIC1761CS08-AIC1766CN08-AIC1766CS08-AIC1766CS14 Fast Delivery |IC PHOENIX CO.,LIMITED

AIC1766CS08 ,BATTERY CHARGE CONTROLLERAPPLICATIONS AC mode allows the battery to drive its loads whileBattery Chargers for :being charge ..
AIC1766CS14 ,BATTERY CHARGE CONTROLLERAPPLICATIONS AC mode allows the battery to drive its loads whileBattery Chargers for :being charge ..
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AIC1761CN08-AIC1761CS08-AIC1766CN08-AIC1766CS08-AIC1766CS14
BATTERY CHARGE CONTROLLER
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02FEATURESReliable Fast Charge Control of NiMH/NiCd Bat-
teries.Quick and Easy Testing for Production.Fast Charge Termination by:
1. Accurate -ΔV Detection Level with Respect to
Peak Battery Voltage Value.AIC1761 ................……………........ -1%AIC1766 ............…………..……...... -0.25%
2. Peak Voltage Timer (0ΔV).Adjustable Fast Charge Safety Timer.Protection against Temperature Fault.Protection against Short-Circuited and Open Bat-teries.Wide Operation Voltage Range: 9V to 18V, no Ex-tra Regulator Needed.Large Battery Voltage Detection Range: 0.65V to3.7V.LED Drivers to Indicate Charge Status or Fault
Conditions.Voltage Reference Output.Space-Saving Packages:
8-PIN DIP, SO
14-PIN DIP, SOAPPLICATIONS
Battery Chargers for :Mobile PhonesNotebook and Laptop Personal ComputersPortable Power Tools and ToysPortable Communication EquipmentsPortable Video and Stereo EquipmentsDESCRIPTION
The AIC1761/1766 fast charge controller IC is
designed for intelligent charging of NiMH or NiCd
batteries without overcharging. It detects a voltage
drop (-ΔV) 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 (0ΔV).
The detection of -ΔV is a very reliable method to
terminate fast charging for NiMH and NiCd batter-
ies. The AIC1761/1766 uses -ΔV detection as one
of primary decisions for fast charge cut-off. The -
ΔV value for the AIC1761 is as small as 16mV per
cell, suitable for NiCd batteries. The
-ΔV 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.
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02TYPICAL APPLICATION CIRCUITC1
10μF
VIN
12 ~ 15 VR10
470pF
AIC1563
Simple Battery Charger for NiMH / NiCd BatteryORDERING INFORMATION
AIC176X-XXXXABSOLUTE MAXIMUM RATINGS
Supply Voltage.......................…………….......................................................................... 18V
DC Voltage Applied on any Pin..............................................…………….............................. 18V
Sink Current of VOUT Pin, LED Pin, and FLASH Pin...............................…………….........20mA
Operating Temperature Range...........................................…………........................ 0°C to 70°C
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02TEST CIRCUIT
+VDD
Voltage
Source
390K
20K
4.7K
150KELECTRICAL CHARACTERISTICS (VDD=12.5V, Ta=25°°°°C, unless otherwise specified.)TYP.918
0.25
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02TYPICAL PERFORMANCE CHARACTERISTICS
VDD(V)
Output Resistance of VOUT pin vs Power
Supply Voltage (Fast Charge Mode)
VOUT111315171820
VDD(V)
Output Resistance of LED pin vs Power
Supply Voltage (Trickle Charge Mode)
LED
VDD(V)
Output Resistance of FLASH pin vs Power
Supply Voltage (Fast Charge Mode)111315171820
Output Resistance of VOUT pin vs
Temperature (Fast Charge Cycle)
Temperature (°C)
Output Resistance of LED pin vs Temperature
(Trickle Charge Cycle)
Temperature (°C)
(V2040608022
VREF Reference Voltage vs Temperature
Temperature (°C)204060805.6
REF
(V
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
VBT (High) Limit vs Temperature
(V204060803.4
VBT (Low) Limit vs Temperature
(V
Safety Timer vs Temperature
(MODE pin = VDD)
Temperature (°C)2040608035
fet
TiBLOCK DIAGRAM
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02PIN DESCRIPTIONS
VDD PIN-Supply voltage input.
GND PIN-Ground.
VBT PIN-Input, to sense battery voltage.
MODE PIN-Input, to set IC operation mode.
TIMER PIN-Input, for safety timer control.
VREF PIN-Voltage reference output.
LED PIN-Output, for LED indicator.
VOUT PIN-Output, for LED indicator.
FLASH PIN-Output, for LED indicator.
(Available for 14-pin version only.)
VNTC PIN-Input, for temperature protection.
(Available for 14-pin version only.)APPLICATION INFORMATIONSBATTERY PROPERTIES
The basic principle of rechargeable battery sys-
tems, including NiMH and NiCd cells, is that the
processes of charge and discharge are reversible.
The charge characteristics of NiMH and NiCd
cells look similar in that (1) the cell voltage at the
end of charge drops and (2) the cell temperature
increases rapidly near the end of charge. Fig. 1
shows the charge voltage and charge tempera-
ture characteristics of NiMH and NiCd cells. No-
tice that the cell voltage decline of NiMH cells at
the end of charge is less pronounced than for
NiCd cells.
Time (min.)
ll V
ll T
e (6010080020
Fig. 1Typical Charge Characteristics of
NiMH/NiCd Battery
Fast-charge batteries are available where re-
charging takes for only 1 hour or less with a sim-
ple control circuit. One main purpose of the con-
trol circuit is to terminate the fast-charge process
to prevent the temperature and internal pressure
of the battery cell from building up to a damaging
level which degrades or even destroys the battery
cell.
The AIC1761/1766 is a battery fast charge con-
troller IC that utilizes the following methods to
terminate the fast charge process for NiMH or
NiCd battery cells:Negative delta voltage cutoff (-ΔV).Peak voltage timer cutoff (0ΔV).Maximum temperature cutoff (TCO).Maximum voltage cutoff (VCO).Safety timer cutoff.
The principle of operation of the AIC1761/1766 is
described in the following section.THE AIC1761/1766 OPERATION
When power is first applied to the charge system,
consisting of rechargeable battery cells, charge cur-
rent source, the AIC1761/1766 and its associated
external circuit, all internal digital circuit blocks of
the AIC1761/1766 are reset by internal power-on-
reset circuitry. The internal control unit then checks
the battery condition to prevent fast charge from
taking place under battery fault conditions, i.e. cell
voltage fault (VBT<0.65V or VBT>3.7V) or cell tem-
perature fault (αNTC>αNTCL or αNTC<αNTCH, for
the 14-pin version). Temperature fault limits corre-
sponding to αNTCL and αNTCH are determined by
an external thermistor divider circuit as included in
the Application Examples, Fig. 10. After the battery
passes condition fault checks, VOUT pin goes to
low to start fast charge while initial timer and safety
timer of the AIC1761/1766 start counting. Both the
negative delta voltage detector and the peak voltage
timer, however, are disabled until the initial timer
period in the initial stage of a charge circle elapses.
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02
The AIC1761/1766 constantly monitors the voltage
at VBT pin, which rises as battery cells are being
fast-charged till battery full condition is nearly ap-
proached. The battery temperature is also con-
stantly being sensed to guard against abnormal
temperature situations. VOUT pin will be pulled high
by an external pull-up device and the fast charge
process be switched to trickle charge when one of
the following situations is encountered:A negative delta voltage (-ΔV) at VBT pin is de-
tected when compared to its peak value. The
sampling rate of -ΔV detection is 2seconds/
sample. The detection level of -ΔV is -1% for the
AIC1761 and -0.25% for the AIC1766.The battery voltage stays at its peak value for
the duration determined by the peak voltage
timer setting (0ΔV).The VBT pin voltage exceeds the “high” battery
voltage protection limit (VCO).The battery temperature, sensed by the ther-
mistor divider, exceeds the fault temperature
range (TCO).The selected safety timer period has finished.
TIMER PIN
The TIMER pin can be used as follows to select
one of the preset safety timer period and its cor-
responding periods of initial timer and peak volt-
age timer:
Power ON
peak voltage timerNOFig. 2 Operation Chart of the AIC1761/1766
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02
MODE PIN
The MODE pin determines the mode in which the
IC works:
The AIC1761/1766 will operate normally when the
MODE pin is left floating ( a 0.1μF capacitor is re-
commended to be tied to MODE pin if the charge
circuit works in a noisy environment). The
AIC1761/1766 otherwise works in following ways
if the MODE pin is biased either to VDD or to GND:
(A) AC Mode (MODE pin biased to GND)
In the midst of normal charge operation, where
VBT pin voltage is in the range from 0.8V to 3.5V
and the preset safety timer has not run out, the
safety timer will stop if the MODE pin is somehow
pulled down to GND level. As long as the MODE
pin remains low, the VOUT pin stays ON and
LED pin OFF regardless whether the battery pack
voltage declines (-ΔV present) or not.
The AC mode can be activated by pulling MODE
pin to GND to avoid premature battery charge
cutoff due to fluctuating charge current source.
Switching MODE pin after the end of the safety
timer has no effect on the AIC1761/1766 display
outputs, i.e., VOUT pin stays OFF while LED pin
stays ON.
(B) TEST Mode (MODE pin biased to VDD)
An unique feature of the AIC1761/1766 is that it
can be put into a TEST mode by pulling the
MODE pin to VDD, allowing verification tests for
the AIC1761/1766 charge circuit to be performed
in a few tens of seconds, extremely valuable in fi-
nal phase of production.
When the AIC1761/1766 is in TEST mode, all the
internal timers are reduced by the following fac-
tors when compared to normal operation:Safety timer reduced by 512 times.Initial timer reduced by 512 times.Peak timer reduced by 64 times.
One critical requirement needs to be observed for
-ΔV detector of the AIC1761/1766 to work prop-
erly in TEST mode. That is, VBT pin voltage must
be kept between approximately 2.8V to 3.3V,
rather than 0.8V to 3.5V in NORMAL mode.
If the TEST mode function is to be utilized in pro-
duction test, it has to be well planned and includ-
ed in circuit design phase to make the voltages of
VBT pin and MODE pin externally controllable. In
addition, an externally controllable TIMER pin can
further reduce test time required for testing the
AIC1761/1766 in TEST mode.
Fig. 3 shows the timing diagram for externally
controlled VBT, TIMER, and MODE pin voltages
of a recommended AIC1766 charge circuit pro-
duction test scheme, utilizing TEST mode func-
tion. Output waveforms of VOUT and LED pins
(and FLASH pin for 14 pin version) of a properly
functioning AIC1766 are also shown in the figure.
In timer segments 4, 8 and 10, VOUT pin should
change from ON to OFF, LED pin from OFF to
ON, and FLASH pin from ON to flashing output
(approximately 4 Hz). For the reset of time,
VOUT pin should remain ON, LED pin OFF, and
FLASH pin ON.

Partno	Mfg	Dc	Qty	Available	Descript
AIC1761CN08	AIC	N/a	50	avai	BATTERY CHARGE CONTROLLER
AIC1761CS08	AIC	N/a	1617	avai	BATTERY CHARGE CONTROLLER
AIC1766CN08	AIC	N/a	1574	avai	BATTERY CHARGE CONTROLLER
AIC1766CS08	AIC	N/a	5000	avai	BATTERY CHARGE CONTROLLER
AIC1766CS14	AIC	N/a	5000	avai	BATTERY CHARGE CONTROLLER