ADVANCED INFORMATION
AIC1596
3A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1596-P1 03/23/00
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FEATURES
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DESCRIPTION
The AIC1596 series are step-down monolithic
PWM regulators delivering 3A at fixed voltages of
2.5V , 3.3V, 5.0V , 12V and using a external di-
vider to adjust output voltage from 1.25V to 30V
with excellent line and load regulation.
Switching frequency up to 150KHz/300KHz are
achievable thus allowing smaller sized filter com-
ponents. Internal current limit and thermal shut-
down circuits provide protection from overloads. It
also provides output overvoltage and short pro-
tection under fault conditions.
The internal precious reference combined with
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Operating Input Voltage From 4.5V to 36V
2.5V, 3.3V, 5V , 12V and Adjustable Output Ver-
sion
Adjustable Version Output Voltage Range , 1.25V
to 30V
±
4% max Over Line and Load Regulation
Available in TO220-5 and TO263-5 Package
Requires Only 4 External Components.
150KHz/300KHz Fixed Constant Frequency
Low Power Standby Mode, I
Q
Typically 80µA
TTL Shutdown Capability.
Output Overvoltage Protection
Current Limit and Thermal Shutdown Protection.
3A Guaranteed Output Current
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APPLICATIONS
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voltage feedback loop provides optimum output
voltage accuracy and fast load transient response.
Packages available are in standard TO220-5 for
standard assembly and TO263-5 for SMD.
Simple High Efficiency Step-down regulator
On-Card Switching regulators
Fixed Voltage power supply for LCD Monitor
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TYPICAL APPLICATION CIRCUIT
1
V
IN
C1
+
C2
AIC1596
5
SHDN
GND
3
FB
4
D1
IN
OUT
2
L1
C3
+
R1
V
OUT
R2
R1 short and R2 open for fixed
switching output version
3A Precision PWM DC/DC Regulator
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
1
AIC1596
3A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1596-P1 03/23/00
!
ORDERING INFORMATION
AIC1596X- XXCX
ORDER NUMBER
PIN CONFIGURATION
PACKAGE TYPE
M: TO263-5
T: TO220-5
OUTPUT VOLTAGE
DEFAULT: Adj.
25: 2.5V
33: 3.3V
50: 5.0V
12: 12.0V
FREQUENCY VERSION
A: 150KHZ
B: 300KHZ
AIC1596A(B)CM
AIC1596A(B)-25CM
AIC1596A(B)-33CM
AIC1596A(B)-50CM
AIC1596A(B)-12CM
(TO263-5)
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. SHDN
12 3 4 5
AIC1596A(B)CT
AIC1596A(B)-25CT
AIC1596A(B)-33CT
AIC1596A(B)-50CT
AIC1596A(B)-12CT
(TO220-5)
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5.SHDN
1 2 3 4 5
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ABSOLUTE MAXIMUM RATINGS
Supply Voltage ……………..……………......……………...............……………….............36V
FB, SHDN Pin Input Voltage……………..……….......…………….…………….................25V
Operating Temperature Range …….………..……...............…….…………....... 0°C ~ 70°C
Storage Temperature Range ……...................……..…….………………….
–65°C
~ 150°C
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TEST CIRCUIT
Refer to Typical Application Circuit.
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
2
AIC1596
3A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1596-P1 03/23/00
ELECTRICAL CHARACTERISTICS
(T
J
=25°C, V
IN
=18V)
°
PARAMETER
Input Voltage
Fixed Output Voltage
AIC1596-25 (V
IN
> 4.5V)
AIC1596-33 (V
IN
> 4.5V)
AIC1596-50 (V
IN
> 7.0V )
AIC1596-12 (V
IN
> 15V )
Feedback Voltage
Output Voltage Regulation
Quiescent Current
Shutdown Quiescent Current
Logic Input High
Logic Input Low
Oscillator Frequency
Oscillator Frequency
Output Current Limit
Over Voltage Protection
Maximum Duty Cycle
Efficiency
Vo=5V , Io=3A
100
90
Internal switch off
SHDN = 5V (OFF)
(Regulator OFF)
(Regulator ON )
AIC1596A series
AIC1596B series
3.0
120
150
300
KHz
A
%
%
%
2
0.8
1
80
AIC1596 Adjustable
TEST CONDITIONS
MIN.
4.5
TYP.
MAX.
36
UNIT
V
V
V
V
V
V
2.5
3.3
5.0
12.0
1.25
4
5
%
mA
µA
V
V
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PIN DESCRIPTIONS
PIN 1: IN
Supply voltage input for the IC
switching regulator. A suitable input
bypass capacitor must be present at
this pin to minimize voltage transients
and to supply the switching currents
needed by the regulator.
Internal switch. The voltage at this pin
switches between (V
IN
-V
SAT
) and ap-
proximately –0.5V, with a duty cycle of
approximately V
OUT
/V
IN
.
Ground requires a short, low noise
connection to ensure good load
regulation.
Feedback input for fixed-output or
adjustable-output version. Connect di-
rectly to output for fixed operation
version or to a resistor divider for ad-
justable operation versions.
PIN 5: SHDN Allows the switching regulator circuit
to be shutdown using logic level sig-
nals thus dropping the total input sup-
ply current to approximately 80µA.
Drive it high to disable the reference,
control circuitry and internal switches.
Drive low or connect to GND for nor-
mal operation.
PIN 4: FB
PIN 2:OUT
PIN 3: GND
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
3
AIC1596
3A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1596-P1 03/23/00
!
BLOCK DIAGRAM
SHDN
IN
1.25 V
Reference
FB
Current
Limit
COMP.
AMP.
COMP.
2.5V Regulator
ON / OFF
Compensation
Circuit
Latch
Driver
OUT
150/300
KHz OSC
Thermal
Shutdown
GND
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PHYSICAL DIMENSIONS
TO-263-5L (unit: mm)
SYMBOL
A
E
L2
A
MIN
4.07
1.45
0.36
1.14
8.63
9.78
0.71
15.11
2.28
-
MAX
4.83
1.96
0.64
1.40
9.66
10.54
1.02
15.59
2.80
1.40
B
C
C2
D
E
L1
D
L
E
L
L1
L2
B
e
C
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
4
AIC1596
3A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1596-P1 03/23/00
"
TO-220-5 (unit: mm)
E
A
F
H1
D
L
e
e2
J1
SYMBOL
A
D
E
e
e1
e2
F
H1
J1
L
MIN
4.06
8.35
9.78
1.57
0.76
0.33
1.14
5.46
2.29
13.21
MAX
4.83
8.89
10.54
1.85
1.02
0.64
1.40
6.86
3.18
14.73
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
www.analog.com.tw
TEL: (8863)577-2500 FAX:(8863)577-2510
5
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