AIC AIC1783CN Battery charge controller Datasheet

AIC1783
Battery Charge Controller
n FEATURES
n DESCRIPTION
l
Fast Charge Control of NiMH/NiCd Batteries.
The AIC1783 fast charge controller IC is designed
l
Fast Charge Termination by: − ? V , 0 ? V , Safety
for intelligent charging of NiMH or NiCd batteries
Timer, Maximum Voltage.
without the risk of overcharge. − ? V detection
l
Protection against Battery Voltage Fault.
(-0.25%) and 0 ? V detection (peak voltage timer)
l
Pulsed Trickle Charge Mode.
are the primary methods employed
l
Quick and Easy Testing for Production.
AIC1783 to terminate fast charge. The fast charge
l
8-pin DIP or SO Packages.
can also be cut off by maximum battery voltage
by
the
along with the safety timer to prevent charging
n APPLICATIONS
under fault conditions of the charging system or
the battery itself.
Battery Fast Chargers for:
l
Mobile Phones.
l
Notebook and Laptop Personal Computers.
l
Portable Power Tools and Toys.
l
Portable Communication Equipment.
l
Portable Video & Stereo Equipment.
The safety timer period is adjustable for flexible
usage that AIC1783 could be applied in the wide
range of battery capacity. Test mode is provided
for charger manufactures to dramatically reduce
production test time.
n TYPICAL APPLICATION CIRCUIT
U1
7805
1
VIN
C5
1µF
1N4148
D3
VIN
+
VOUT
GND
3
+ C6
2
10µF
LED1
R4
120K
1
L1
R13
D1
1N5822
U3
R9
1
390K
2
C7
DC
DE
IS
3 CF
VCC
4 GND
1000P
C2
220µF
D4
BOOST
FB
8
7
6
R2
D2
IN4148
C3
0.1µF
BAT1
BATTERY
+
120/0.5W
RED
1N5822
220µH
1µF
100K
R1
1K
C1
R3
240K
R11 100K
R5
C4
120K 0.1µF
+
C9
4.7µF
C10
R12
47nF
150K
U2
REF
VCC
2 TIMER
VBT
3 MODE
ICON
4 GND
LED
8
R6
R7
7
680
47K
6
R8
10K
Q1
5
2N222
AIC1783
R10
0.3/5W
5
AIC1563
+
C8
220µF
Battery Charge Circuit with Wide Input Voltage Range
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1783-00
TEL: 886-3-5772500
May 28, 01
FAX: 886-3-5772510
www.analog.com.tw
1
AIC1783
n ORDERING INFORMATION
AIC1783C X
ORDER NUMBER
PIN CONFIGURATION
AIC1783CN
(PLASTIC DIP)
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
AIC1783CS
(PLASTIC SO)
REF 1
8 VCC
TIMER 2
7 VBT
MODE 3
6 ICON
GND 4
5 LED
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage
............................................… … … … ........................................ 5.5V
DC Voltage Applied on any pin ......................… … … … … ...................................... 5.5V
Sink current of ICON pin, LED1 and LED2 pin .......................… … … .................. 20mA
Operating Temperature Range
.............................................… … … ......
Storage Temperature Range .............................................… … … … ......
-40C~ 85°C
-65°C~ 150°C
n TEST CIRCUIT
5V
1
100K
2
3
RTIMER
100K
120K
REF
VCC
TIMER
VBT
8
5V
+
7
680
MODE
ICON
4
GND
LED
-
VOLTAGE
SOURCE
6
5
680
AIC1783
RED
GREEN
5V
2
AIC1783
n ELECTRICAL CHARACTERISTICS (Ta=25°C, V
PARAMETER
=5V, unless otherwise specified.)
SYMBOL
MIN.
TYP.
MAX.
UNIT
Supply Voltage
VCC
4.5
5.0
5.5
V
Supply Current
ICC
Voltage Protection Limit
TEST CONDITIONS
CC
Battery Low
During Initial Timer
After Initial Timer
VBT
Battery High
Output Impedance
Input Impedance
LED, ICON Pins
ON
OFF
0.16
0.69
0.21
0.75
2.6
2.7
2.80
25
50
1
300
pin
Recommended
External Resistor of
TIMER pin
V
Ω
MΩ
KΩ
1
RTIMER
VBT=2V
mA
0.11
0.63
MODE pin
VBT
-∆V Detection accuracy
1.1
MΩ
2
100
1000
KΩ
-0.15
-0.25
-0.35
%
3
AIC1783
n TYPICAL
PERFORMANCE CHARACTERISTICS
(Ta=25°C, RTIMER =100KΩ ,
VCC =5V, refer to Test Circuit)
Safety Timer vs Supply Volatge
Supply Current vs Supply Voltage
1.21
81.0
Safety Timer (min.)
Supply Current (mA)
1.18
1.12
1.06
80.5
80.0
79.5
1.00
4.4
4.6
4.8
5.0
5.2
79.0
5.4
4.4
4.6
4.8
5.0
5.2
VCC (V)
VCC (V)
LED Flashing Frequency vs Supply Voltage
Supply Current vs Temperature
5.4
4.8
1.26
Supply Current (mA)
Frequency (Hz)
4.6
4.4
4.2
1.14
1.02
4.0
3.8
0.9
4.4
4.6
4.8
5.0
5.2
0
5.4
20
VCC (V)
40
Temperature (°C)
60
80
LED Flashing Frequency vs Temperature
Safety Timer vs Temperature
5.0
82.0
Frequency (Hz)
Safety Timer (min.)
4.6
81.0
4.2
80.0
3.8
79.0
0
20
40
Temperature(°C)
60
80
3.4
0
20
40
60
80
Temperature( °C)
4
AIC1783
n TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
V BT(LOW) Limits vs Temperature
( After Initial Timer)
V BT (high) Limit vs Temperature
2.74
0.700
0.695
VBT (V)
VBT (V)
2.70
0.690
2.66
0.685
2.62
0
20
40
Temperature ( °C)
60
0
80
20
60
80
Output Impedance vs Temperature
(LED,ICON pins)
VB T (low) Limit vs Temperature (During Initial Timer)
29
Output Impedance(Ω)
0.163
0.162
VB T (V)
40
Temperature (°C)
0.161
0.160
0.159
0.158
27
25
23
0
20
40
Temperature (°C)
60
80
0
20
40
Temperature (°C)
60
80
5
AIC1783
n
BLOCK DIAGRAM
MODE
MODE
Selection
GND
VCC
Bandgap
Reference &
Voltage
Regulator
REF
LED
Oscillator
Display
Control
Unit
Charge Control
Battery Voltage
Protection Setting
TIMER
ICON
State Machine
13-bit
A/D
Charge
Control Unit
Battery
Voltage
Protection
VBT
n PIN DESCRIPTIONS
PIN 1: REF-
Reference voltage input,
PIN 5: LED-
acceptable voltage range :
indicate the battery charging
(V CC -1.4V) ~ (0.5V CC -0.4V)
status.
PIN 2: TIMER- Determining the period of
PIN 6: ICON- Open-drained output, used to
safety timer with an external
control the charging current to
resistor connected to GND.
the battery.
PIN 3: MODE- Determining the mode of
PIN 7: VBT-
operation for the AIC1783.
PIN 4: GND-
Open-drained output used to
Power ground.
Divided battery voltage input to
sense the battery voltage.
PIN 8: VCC-
Power supply input at 5V±10%.
6
AIC1783
n APPLICATION INFORMATIONS
OPERATION
l
Maximum charge time
l
Maximum battery voltage
Power-On and Battery Pre-qualifying
When power is first applied to the AIC1783, all
-∆V Cutoff
internal digital circuit blocks of the AIC1783 are
The AIC1783 makes a voltage sampling at VBT pin
reset by the internal power-on-reset circuitry and
every 4 seconds when safety timer period is set
output LED flash 3 times to indicate the initiation of
equal to 80 minutes. If a negative delta voltage of
power-on. The internal control unit then examines
0.25% compared to its peak value is detected at
the battery condition through the VBT pin.
VBT pin, the fast charge cycle is terminated.
The acceptable range of VBT pin is 0.16V to 2.7V. If
0∆V Cutoff
the voltage of VBT pin fails to fall within the
predetermined
acceptable
limits,
the
AIC1783
enters a charge-suspending mode, in which all the
internal circuitry remains in reset state.
by the peak voltage timer which is 6% of safety timer,
Maximum Safety Timer Cutoff
After the battery passes fault checks, fast charging
begins while initial timer and safety timer of the
start
decreases very slowly for the duration determined
the fast charge action is terminated.
Fast Charge
AIC1783
If the battery voltage stays at its peak value or
counting.
Functions
of
−? V
detection, peak voltage timer, and maximum battery
voltage are, however, disabled temporarily until the
initial timer period in the initial stage of a charge
cycle elapses. The initial timer period is equal to
1/80 of safety timer.
Since the low limit of acceptable VBT voltage is only
about 0.16V during the initial timer period, even
deeply discharged batteries can easily qualify to be
fast charged subsequently.
The maximum fast charge period is determined by
the safety timer, which is set by a resistor connected
from TIMER pin to GND. Safety timer,
−? V
sampling rate will be longer if the resistor value is
larger. When the value of the resistor is 100KΩ, the
safety timer period equals 80 minutes.
After the
safety timer period is finished, the fast charge action
is terminated.
Maximum Voltage Cutoff
The AIC1783 guards against the maximum limits for
battery voltage during fast charging. If either of
these limits is exceeded, fast charge action is
terminated.
In the course of fast charge, the AIC1783 constantly
monitors the voltages at VBT pin. The fast charge
process is switched to trickle charge when any one
of the following situations is encountered, which are
explained below:
l
Negative delta voltage ( − ? V )
l
Peak voltage timer ( 0 ? V )
Trickle Charge
The trickle charge after the fast charge to prevent
the loss of charge due to battery self-discharging.
The duty cycle is set to 1/128 by internal circuitry.
7
AIC1783
The functions and charging states control mentioned
above are illustrated in the function flow chart of
AIC1783 (Fig. 2)
Setting the Period of Safety Timer
The AIC1783 provides a method for linearly
adjusting the period of safety timer with an external
resistor connected from TIMER pin to GND. The
relation between safety timer length and the
external resistor (RTIMER ) is shown in Fig. 3. The
DESIGN GUIDE
table following shows the resistor values for some of
the commonly chosen safety timer periods. Also
Battery Voltage Measurement
shown in the table are their corresponding oscillator
The AIC1783 measures the battery voltage through
frequencies.
VBT pin, which is connected to battery positive
terminal through a resistor-divider net work, as
800
shown in Fig. 1
600
RTIMER (KΩ)
VBAT
RA
R5
200
VBT
C6
0.1µF
100K
+
C5
4.7µF
RB
7
400
AIC1783
0
0
200
300
400
500
Safety Timer (min.)
Fig. 3
FIG. 1
100
Safety Timer vs. RTIMER
Battery Voltage Divider
The suggested divider resistance of RA and RB
for the corresponding number of battery cells are
as below:
BATTERY
CELLS
RA/RB
RA (KΩ)
RB (KΩ)
2~4
2
240
120
3~6
3.3
300
91
4~8
4.9
300
62
5~10
6.4
300
47
6~12
7.8
310
39
8~16
10.8
390
36
8
AIC1783
Power ON
LED Flash 3 Times
If
VBT in Normal
Range
No
LED Displays Abnormal,
ICON ON,
Safety Timer Reset
Yes
Charging
(ICON OFF)
No
If
Initial Timer
Finished
Yes
If
VBT in Normal
Range
No
Yes
If
0Δ V
is Detected
LED Display Fast Charge
ICON OFF
Yes
Yes
No
If
-0.25% ΔV
is Detected
Yes
LED Display
Battery Fulll,
Fast Charge
Finished,
Trickle Charge
Starts
Battery Replacement
No
No
No
If
Safety Timer Period
has Finished
Fig. 2
Yes
Function Flow Chart of AIC1783
9
AIC1783
RTIMER (KΩ)
Display the Battery Charging Status
OSC.
Safety timer
Freq.(KHz)
(min.)
The AIC1783 provides an open-drained output, LED
11
262.4
10
pin, to indicate the battery charging status. The
23
131.2
20
outputs of LED pin are shown in the following table:
48
65.6
40
74
43.7
60
Power
100
32.8
80
ON
152
21.9
120
206
16.4
160
314
10.9
240
491
7.3
360
667
5.5
480
LED
1Hz
Fast
Charge
Fault
Charging Completed Conditions
4Hz
ON
Flashing
OFF
Charging Current Control
As shown in the typical application circuit, the
AIC1783 offers an open-drained output pin, ICON
Selecting Mode of Operation
pin, to control the charging current flow in fast
The AIC1783 provides three modes of operation:
charge state and switch on to inhibit the charging
normal, test, and AC mode determined by the
current flow in fault conditions. When fast charge is
setting of MODE pin. The AIC1783 will operate
completed, the AIC1783 enters the trickle charge
normally when the MODE pin is left floating (a 0.1µF
mode. In trickle charge mode, the ICON pin output
capacitor is recommended to be tied to MODE pin if
switches with 1/128 duty cycle.
the charge circuit works in a noisy environment).
When the MODE pin is biased to GND, the function
Power
Fast
Charge
Fault
of -∆V detection is disabled. When the MODE pin is
ON
Charging
Completed
Conditions
ON
OFF
biased to VCC , the AIC1783 enters the test mode.
The test mode can be used to significantly reduce
ICON
1/128
ON
Duty cycle
production test time.
MODE pin
Mode
VCC
Test
Function
Safety timer period scaled
down to 1/32
Floating
GND
Normal Normal operation
AC
–∆V detection disabled
10
AIC1783
n PHYSICAL DIMENSIONS
l
8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
5.00
E
3.80
4.00
H
E
e
e
1.27(TYP)
A
A1
C
B
l
H
5.80
6.20
L
0.40
1.27
L
8 LEAD PLASTIC DIP (unit: mm)
D
E1
E
A2
A1
C
L
eB
b
SYMBOL
MIN
MAX
A1
0.381
—
A2
2.92
4.96
b
0.35
0.56
C
0.20
0.36
D
9.01
10.16
E
7.62
8.26
E1
6.09
7.12
e
2.54 (TYP)
eB
—
10.92
L
2.92
3.81
e
11
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