AIC AIC1594 1a step-down pwm regulator Datasheet

AIC1594
ADVANCED INFORMATION
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-P1 03/23/00
! DESCRIPTION
! FEATURES
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Operating Input Voltage From 4.5V to 36V
2.5V, 3.3V, 5V , 12V and Adjustable Output Version
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
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 divider 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-
Low Power Standby Mode, IQ Typically 80µA
TTL Shutdown Capability.
Output Overvoltage Protection
Current Limit and Thermal Shutdown Protection.
1A Guaranteed Output Current
ponents. Internal current limit and thermal shutdown circuits provide protection from overloads. It
also provides output overvoltage and short protection under fault conditions.
The internal precious reference combined with
voltage feedback loop provides optimum output
! APPLICATIONS
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voltage accuracy and fast load transient response.
Simple High Efficiency Step-down regulator
On-Card Switching regulators
Packages available are in
standard SOT89-5
and DIP8 for standard assembly and TO263-5,
SOP8 for SMD.
! TYPICAL APPLICATION CIRCUIT
2
1
IN
VIN
+
C2
C1
OUT
L1
AIC1594
SHDN
FB
D1
+
C3
VOUT
4
R1
GND
3
R2
R1 short and R2 open for fixed
switching output version
1A Precision PWM DC/DC Regulator
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
AIC1594
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-P1 03/23/00
! ORDERING INFORMATION
XXCX
AIC1594X
PIN CONFIGURATION
ORDER NUMBER
PACKAGE TYPE
M: TO263-5
N: DIP8
S: SO8
T: TO220-5
AIC1594A(B)CM
AIC1594A(B)-25CM
AIC1594A(B)-33CM
AIC1594A(B)-50CM
AIC1594A(B)-12CM
(TO263-5)
OUTPUT VOLTAGE
DEFAULT: Adj.
25: 2.5V
33: 3.3V
50: 5.0V
12: 12.0V
FREQUENCY VERSION
A: 150KHZ
B: 300KHZ
AIC1594A(B)CN
AIC1594A(B)-25CN
AIC1594A(B)-33CN
AIC1594A(B)-50CN
AIC1594A(B)-12CN
(DIP8)
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5. SHDN
TOP VIEW
IN 1
8 SHDN
IN 2
7 FB
6 GND
OUT 3
OUT 4
AIC1594A(B)CS
AIC1594A(B)-25CS
AIC1594A(B)-33CS
AIC1594A(B)-50CS
AIC1594A(B)-12CS
(SO8)
AIC1594A(B)CT
AIC1594A(B)-25CT
AIC1594A(B)-33CT
AIC1594A(B)-50CT
AIC1594A(B)-12CT
(TO220-5 )
1 2 3 4 5
FRONT VIEW
1: IN
2. OUT
3. GND
4. FB
5.SHDN
5 GND
1 2 3 4 5
! 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
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
2
AIC1594
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-P1 03/23/00
! ELECTRICAL CHARACTERISTICS (TJ=25°°C, VIN=18V)
PARAMETER
TEST CONDITIONS
Input Voltage
Fixed Output Voltage
Feedback Voltage
MIN.
TYP.
4.5
MAX.
UNIT
36
V
AIC1594-25 (VIN > 4.5V)
2.5
V
AIC1594-33 (VIN > 4.5V)
3.3
V
AIC1594-50 (VIN > 7.0V )
5.0
V
AIC1594-12 (VIN > 15V )
12.0
V
AIC1594 Adjustable
1.25
V
Output Voltage Regulation
4
%
5
mA
Quiescent Current
Internal switch off
1
Shutdown Quiescent Current
SHDN = 5V (OFF)
80
Logic Input High
(Regulator OFF)
Logic Input Low
(Regulator ON )
Oscillator Frequency
AIC1594A series
150
Oscillator Frequency
AIC1594B series
300
KHz
1.5
A
120
%
Output Current Limit
2
Over Voltage Protection
Efficiency
V
0.8
1.0
Maximum Duty Cycle
µA
100
Vo=5V , Io=2A
V
%
90
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
%
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
PIN 2:OUT
PIN 3: GND
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 ( VIN-VSAT) and
approximately –0.5V, with a duty cycle
of approximately VOUT/VIN.
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 directly to output for fixed operation
version or to a resistor divider for adjustable operation versions.
PIN 5: SHDN Allows the switching regulator circuit
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.
SO8, DIP8
PIN 1, 2: 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.
PIN 3, 4: OUT Internal switch. The voltage at this pin
switches between ( VIN-VSAT) and approximately –0.5V, with a duty cycle of
approximately VOUT/VIN.
PIN 5, 6: GNDGround requires a short, low noise
connection to ensure good load regulation.
PIN 7:
PIN 8:
FB Feedback input for fixed-output or adjustable-output version. Connect directly to output for fixed operation version or to a resistor divider for adjustable operation versions.
SHDN Allows the switching regulator circuit 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.
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
4
AIC1594
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-P1 03/23/00
!
BLOCK DIAGRAM
SHDN
IN
1.25 V
Reference
2.5V Regulator
ON / OFF
FB
Current
Limit
COMP.
AMP.
COMP.
Latch
Compensation
Driver
Circuit
OUT
!
150/300
Thermal
KHz OSC
Shutdown
GND
PHYSICAL DIMENSIONS
" 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
A
A1
C
B
1.27(TYP)
H
5.80
6.20
L
0.40
1.27
L
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
AIC1594
1A STEP-DOWN PWM REGULATOR
SPEC NO: DS-1594-P1 03/23/00
" 8 LEAD PLASTIC DIP (unit: mm)
D
E1
E
A2
A1
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
C
L
e
eB
b
SYMBOL
e
2.54 (TYP)
eB
—
10.92
L
2.92
3.81
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
6
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