ADVANCED INFORMATION
AIC1594
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-P1 03/23/00
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FEATURES
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"
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!
DESCRIPTION
The AIC1594 series are step-down monolithic
PWM regulators delivering 1A 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.
1A Guaranteed Output Current
!
APPLICATIONS
"
"
voltage feedback loop provides optimum output
voltage accuracy and fast load transient response.
Packages available are in
SOP8 for SMD.
standard SOT89-5
Simple High Efficiency Step-down regulator
On-Card Switching regulators
and DIP8 for standard assembly and TO263-5,
!
TYPICAL APPLICATION CIRCUIT
1
V
IN
C1
IN
+
C2
OUT
D1
4
R1
AIC1594
SHDN
FB
2
L1
C3
+
V
OUT
GND
3
R2
R1 short and R2 open for fixed
switching output version
1A 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
AIC1594
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-P1 03/23/00
!
ORDERING INFORMATION
AIC1594X- XXCX
ORDER NUMBER
PIN CONFIGURATION
PACKAGE TYPE
M: TO263-5
N: DIP8
S: SO8
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
AIC1594A(B)CM
AIC1594A(B)-25CM
AIC1594A(B)-33CM
AIC1594A(B)-50CM
AIC1594A(B)-12CM
(TO263-5)
AIC1594A(B)CN
AIC1594A(B)-25CN
AIC1594A(B)-33CN
AIC1594A(B)-50CN
AIC1594A(B)-12CN
(DIP8)
AIC1594A(B)CS
AIC1594A(B)-25CS
AIC1594A(B)-33CS
AIC1594A(B)-50CS
AIC1594A(B)-12CS
(SO8)
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. SHDN
1 2 3 4 5
TOP VIEW
IN 1
IN 2
OUT 3
OUT 4
8 SHDN
7 FB
6 GND
5 GND
AIC1594A(B)CT
AIC1594A(B)-25CT
AIC1594A(B)-33CT
AIC1594A(B)-50CT
AIC1594A(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
!
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
AIC1594
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-P1 03/23/00
°
!
ELECTRICAL CHARACTERISTICS
(T
J
=25°C, V
IN
=18V)
PARAMETER
Input Voltage
Fixed Output Voltage
AIC1594-25 (V
IN
> 4.5V)
AIC1594-33 (V
IN
> 4.5V)
AIC1594-50 (V
IN
> 7.0V )
AIC1594-12 (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=2A
100
90
Internal switch off
SHDN = 5V (OFF)
(Regulator OFF)
(Regulator ON )
AIC1594A series
AIC1594B series
1.0
150
300
1.5
120
KHz
A
%
%
%
2
0.8
1
80
AIC1594 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
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
AIC1594
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-P1 03/23/00
!
PIN DESCRIPTIONS
TO-220-5, TO-263-5
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
approximately –0.5V, with a duty cycle
of approximately V
OUT
/V
IN
.
Ground requires a short, low noise
connection to ensure good load
regulation.
PIN 4: FB
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 normal operation.
PIN 2:OUT
PIN 3: GND
SO8, DIP8
Supply voltage input for the IC switch-
ing 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.
PIN 3, 4: OUT 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
/
VIN
.
PIN 5, 6: GNDGround requires a short, low noise
connection to ensure good load regu-
lation.
PIN 1, 2: IN
PIN 7:
FB Feedback input for fixed-output or ad-
justable-output version. Connect di-
rectly to output for fixed operation ver-
sion or to a resistor divider for adjusta-
ble operation versions.
SHDN Allows the switching regulator cir-
cuit to be shutdown using logic level
signals thus dropping the total input
supply current to approximately 80µA.
Drive it high to disable the reference ,
control circuitry , and internal
switches .Drive low or connect to GND
for normal operation.
PIN 8:
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
AIC1594
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-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
"
8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL
A
A1
H
E
MIN
1.35
0.10
0.33
0.19
4.80
3.80
5.80
0.40
MAX
1.75
0.25
0.51
0.25
5.00
4.00
6.20
1.27
B
C
D
E
e
A
C
A1
e
H
L
L
1.27(TYP)
B
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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