AIC1563
Versatile DC/DC Converter
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
www.analog.com.tw
DS-1563-01 Jan 30, 01
TEL: 886-3-5772500
FAX: 886-3-5772510
1
FEATURES
3V to 30V Input Voltage Operation.
Internal 2A Peak Current Switch.
1.5A Continuous Output Current.
Bootstrapped Driver.
High Side Current Sense Capability.
High Efficiency (up to 90%).
Internal
2% Reference.
Low Quiescent Current at 1.6mA.
Frequency Operation from 100Hz to 100KHz.
APPLICATIONS
Constant Current Source for Battery Chargers.
Saver for Cellular phones.
Step-Down DC-DC Converter Module.
DESCRIPTION
The AIC1563 is a monolithic control circuit
containing the primary functions required for DC
to DC converters and highside-sensed constant
current source. The device consists of an inter-
nal temperature compensated reference, com-
parator, controlled duty cycle oscillator with an
active current sense circuit, bootstrapped driver,
and high current output switch. This device is
specifically designed to construct a constant
current source for battery chargers with a mini-
mum number of external components. Boot-
strapped driver can drive the NPN output switch
to saturation for higher efficiency and less heat
dissipation. The AIC1563 can deliver 1.5A con-
tinuous current without requiring a heat sink.
TYPICAL APPLICATION CIRCUIT
BOOST
IS
DC
DE
CF
GND
*RS
V
IN
L
220
H
D2
1N1418
RB
33K
D3
1N5819
1K
C
O
C1
D1
1N5821
3C
1
F
CT
47
0pF
RA
5.6K
220
F
+
+
AIC1563
C5
10
F
+
R1
*I
O
=300mV/RS
I
O
R2
120
220
F
VCC
FB
(%)
Io (A)
0
0.5
1
1.5
2
70
80
90
100
V
IN
= 16V, V
O
= 8V
V
IN
= 16V, V
O
= 12V
Efficiency vs Output Current
AIC1563
AIC1563
2
ORDERING INFORMATION
AIC1563 XX
ORDER NUMBER
AIC1563CN
(PLASTIC DIP)
PIN CONFIGURATION
AIC1563CS
(PLASTIC SO)
TOP VIEW
VCC
BOOST
DE
CF
GND
IS
FB
DC 1
3
4
2
8
6
5
7
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE
C: 0
C~+70C
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
..........................................................................................................
30V
Comparator Input Voltage Range
.................................................................. -0.3V~30V
Switch Collector Voltage
............................................................................................ 30V
Switch Emitter Voltage
.............................................................................................. 30V
Switch Collector to Emitter Voltage
........................................................................... 30V
Driver Collector Voltage
............................................................................................. 30V
Switch Current
........................................................................................................... 2A
Power Dissipation and Thermal Characteristics
DIP Package
Ta= 25
C ........................................................................ 1.0W
Thermal Resistance .................................................. 100
C/W
SO Package
Ta= 25
C .................................................................... 625mW
Thermal Resistance .................................................. 160
C/W
Operating Junction Temperature
........................................................................... 125
C
Operating Ambient Temperature Range ............................................................... 0~70
C
Storage Temperature Range ................................................................... - 65
C ~ 150C
TEST CIRCUIT
BOOST
AIC1563
8
7
6
5
4
3
2
1
DC
IS
DE
CF
GND
FB
VCC
R1
1K
CT
1nF
1A
Current Source
VCC
1.275V
VCC
50mA
Current Source
4.55V
@VCC=5V
4.75V
2V/0V
I
DISCHG
/ I
CHG
1.225V
AIC1563
AIC1563
3
ELECTRICAL CHARACTERISTICS
(VCC= 5V, Ta=25
C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Oscillator
Charging Current
5.0V
VCC30V
I
CHG
10
25
40
A
Discharge Current
5.0V
VCC30V
I
DISCHG
100
150
200
A
Voltage Swing
PIN 3
V
OSC
0.6
V
Discharge to Charge Cur-
rent Ratio
V
IS
=VCC
I
DISCHG
/
I
CHG
6.0
Current Limit Sense Voltage I
CHG
=I
DISCHG
VCC - V
IS
250
300
350
mV
Output Switch
Saturation Voltage, Emitter
Follower Connection
I
DE
=1.0A;
V
BOOST
=V
DC
= VCC
V
CE(SAT)
1.5
1.8
V
Saturation Voltage
I
DC
=1.0A; I
BOOST
=50mA, (Forced
20)
V
CE (SAT)
0.4
0.7
V
DC Current Gain
I
SC
=1.0A; V
CE
=5.0V
h
FE
35
120
Collector Off-State Current
V
CE
=30V
I
C(OFF)
10
nA
Comparactor
Threshold Voltage
Ta=25
C
0
C Ta 70C
V
FB
1.225
1.21
1.25
1.275
1.29
V
V
Threshold Voltage Line
Regulation
3.0V
VCC30V
REG
LINE
0.1
0.3
mV/V
Input Bias Current
V
IN
=0V
I
IB
0.4
1
A
Supply Current
V
IS
=VCC, pin 5>V
FB
5.0V
VCC 30V
C
T
=1nF
PIN 2=GND
Remaining pins open
I
CC
1.6
3
mA
AIC1563
AIC1563
4
TYPICAL PERFORMANCE CHARACTERISTICS
CT, Oscillator Timing Capacitor (nF)
t
ON
-
O
F
F
,
Out
put
Sw
i
t
c
h
ON
-
O
FF Ti
me (
S)
Output Switch ON-OFF Time vs Oscillator Timing
Capacitor
0.1
1
10
100
1
10
10
0
1
00
0
OFF-TIME
ON -TIME
VCC=5V
V
IS
=VCC
PIN 5=GND
Standby Supply Current vs Supply Voltage
VCC, Supply Voltage (V)
I
CC
, S
u
p
p
l
y
Cu
rr
e
n
t (
m
A
)
0
5
10
15
20
25
30
0
0.4
0.8
1.2
1.6
2
C
T
= 1nF
V
IS
= VCC
PIN 2 =GND
V
FB
, T
h
re
sho
l
d
V
o
l
t
ag
e
(V
)
Temperature (
C)
V
FB
, Threshold Voltage vs Temperature
1.2
1.22
1.24
1.26
1.28
1.3
0
10
20
30
40
50
60
70
80
VCC = 5V,
C
T
= 1nF,
PIN 2 = GND
V
FB
,
Thres
hol
d
V
o
l
t
age (m
V
)
Temperature (
C)
I
S
Threshold Voltage vs Temperature
250
260
270
280
290
300
0
10
20
30
40
50
60
70
80
VCC = 5V,
C
T
= 1nF,
PIN 2 = GND
310
320
330
340
350
Emmiter Follower Configuration Output Switch
Saturation Voltage vs Emmiter Current
I
E
, Emitter Current (A)
1.2
1.3
1.4
1.5
1.6
1.7
1.8
V
CE(
SAT
)
,
S
a
tu
ra
ti
on
V
o
l
t
a
g
e
(
V
)
0
0.5
1
1.5
VCC = 5V
PIN 1, 7, 8 = VCC
PIN 3, 5 = GND
Common Emitter Configuration Output Switch
Saturation Voltage vs Collector Current
I
C
, Collector Current (A)
V
C
E
(SAT
)
, S
a
tu
ra
ti
o
n
V
o
l
t
a
g
e
(
V
)
0
0.5
1
1.5
0
0.2
0.4
0.6
0.8
VCC = 5V
PIN 7 = VCC
PIN 2, 3, 5 = GND
Forced Beta = 20
AIC1563
AIC1563
5
BLOCK DIAGRAM
Q
R
S
BOOST
IS
VCC
FB
GND
CF
DC
DE
8
7
6
5
4
3
2
1
Q1
Oscillator
Is
CT
Comparator
-
+
1.25V
Reference
Voltage
Q2
80
PIN DESCRIPTIONS
PIN 1: DC
- 2A switch collector.
PIN 2: DE
- Darlington switch emitter.
PIN 3: CF
- Oscillator timing capacitor.
PIN 4: GND - Power ground.
PIN 5: FB
- Feedback comparator inverting input.
PIN 6: VCC - Power supply input.
PIN 7: IS
- Highside current sense input.
VCC - V
IS
=300mV.
PIN 8: BOOST-Bootstrapped driver collector.
APPLICATION INFORMATIONS
DESIGN FORMULA TABLE
CALCULATION
STEP-DOWN
STEP-UP
t
t
ON
OFF
V
+ V
V
- V - V
OUT
F
IN(MIN)
SAT
OUT
V
+ V
V
V
- V
OUT
F
IN(MIN)
IN(MIN)
SAT
-
(t
ON
+ t
OFF
)
MAX
1
F
MIN
1
F
MIN
C
T
4x10
-5
t
ON
4 x 10
-5
t
ON
I
C (SWITCH)
2I
OUT(MAX)
2I
OUT(MAX)
(
)
t + t
t
ON
OFF
OFF
RS
0.3/I
C(SWITCH)
0.3/ I
C (SWITCH)
L(MIN)
(
)
V
- V
- V
I
t
IN(MIN)
SAT
OUT
C(SWITCH)
ON(MAX)
(
)
V
- V
I
t
IN(MIN)
SAT
C(SWITCH)
ON(MAX)
Co
I
(t
+ t
8V
C ( SWITCH)
ON
OFF
RIPPLE (P - P )
)
I t
V
OUT
ON
RIPPLE(P - P)
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