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PDF AIC1766-CS14 Data sheet ( Hoja de datos )
| Número de pieza | AIC1766-CS14 | |
| Descripción | BATTERY CHARGE CONTROLLER | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Reliable Fast Charge Control of NiMH/NiCd Bat-
teries.
Quick and Easy Testing for Production.
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).
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 to
3.7V.
LED Drivers to Indicate Charge Status or Fault
Conditions.
Voltage Reference Output.
Space-Saving Packages:
8-PIN DIP, SO
14-PIN DIP, SO
APPLICATIONS
Battery Chargers for :
Mobile Phones
Notebook and Laptop Personal Computers
Portable Power Tools and Toys
Portable Communication Equipments
Portable Video and Stereo Equipments
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02
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.
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
1 page  
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02
TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED)
VBT (High) Limit vs Temperature
VBT (Low) Limit vs Temperature
3.8 0.71
3.7 0.67
3.6 0.63
3.5
(V)
3.4
0
20 40 60
Temperature (°C)
Safety Timer vs Temperature
(MODE pin = VDD)
45
80
0.59
0.55
0
20 40 60
Temperature (°C)
43
41
39
37
35
0 20 40 60 80
Temperature (°C)
BLOCK DIAGRAM
VREF
VR3
VDD
Voltage
Regulator
+-
GND
VNTC (for 14 pin version)
VR4
+-
Power On
Reset
VR1 +
-
VBT
+
-
VR2
CHARGE CONTROL
STATE MACHINE
13-Bit
ADC
Mode
Select
Timing
Control
Oscillator
LED
FLASH
(for 14 pin version)
VOUT
MODE
TIMER
80
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
5
5 Page 
3. If the battery charge current is high, say, over
1.5A, quality of circuit board layout and wiring
connection points become increasingly im-
portant in the charger circuit reliability.
4. Critical components need to meet adequate
rating to prevent heating-up of these compo-
nents from causing circuit malfunction.
5. Since the AIC1761/1766 is fabricated with
CMOS process, cares must be taken in han-
dling this device to avoid possible damage
from electro-static discharge.
EXPERIMENTAL RESULTS
Experiments have been conducted to verify the
AIC1761/1766 operation with NiCd and NiMH
battery cells of various brands. Actual results
shown in the following figures clearly indicate that
the negative delta voltage detector and the peak
voltage timer of the AIC1761/1766 have precisely
detected the tiny cell voltage drops or the cell volt-
age peaks and subsequently terminated the fast
charge process after batteries are fully charged.
The battery cell temperatures were all under
safety levels. Note that the fast charge for the
NiMH battery in Fig. 5 is terminated by the peak
voltage timer (0∆V ) while the fast charge for the
NiCd battery in Fig. 6 is terminated by the -∆V
detector.
1.6
Charge Current = 1A
Cell Capacity = 1000mAH
1.5
Voltage
1.4
AIC1766
60
50
40
Temperature
1.3 30
AIC1766
20
1.2 0
20 40
60 80
Charge Time (min.)
Fig. 5 Charge Characteristics of NiMH Battery
Both Fig. 5 and Fig. 6 were obtained by using the
AIC1766. Results of similar experiments by using the
AIC1761 are shown in Fig. 7 and Fig.8.
AIC1761/1766
BATTERY CHARGE CONTROLLER
SPEC NO: DS-1761-02
1.7
Charge Current=0.7A
Cell Capacity=700mAH
1.6
Voltage
60
50
1.5 40
Temperature
1.4 30
1.3
0
Fig. 6
AIC1766
20
20 40 60
Charge Time (min.)
80
Charge Characteristics of NiCd Battery
1.6
Charge Current = 1A
Cell Capacity =1000mAH
1.5
Voltage
1.4
60
50
40
Temperature
1.3
30
1.2
0
Fig. 7
AIC1761
20
10 20 30 40 50 60 70
Charge Time (min.)
Charge Characteristics of NiMH Battery
1.7
Charge Current=0.7A
Cell Capacity=700mAH
1.6
Voltage
1.5
60
50
40
1.4 30
AIC1761
Temperature
1.3 20
0 20 40 60 80
Charge Time (min.)
Fig. 8 Charge Characteristics of NiCd Battery
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
11
11 Page | ||
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| PDF Descargar | [ Datasheet AIC1766-CS14.PDF ] | |
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