AIC1594B-25CM - Analog Integrations Corporation

ADVANCED INFORMATION AIC1594

1A STEP-DOWN PWM REGULATOR

SPEC NO: DS-1594-P1 03/23/00

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

! FEATURES

" 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, IQ Typically 80µA

" TTL Shutdown Capability.

" Output Overvoltage Protection

" Current Limit and Thermal Shutdown Protection.

" 1A Guaranteed Output Current

! APPLICATIONS

" Simple High Efficiency Step-down regulator

" On-Card Switching regulators

! DESCRIPTION

The AIC1594 series are step-down monolithic

PWM r egulators delivering 1A at f ixed 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 protec tion f r om overloads. It

also provides output overvoltage and short pro-

tection under fault conditions.

The internal precious reference combined with

voltage feedback loop provides optimum output

voltage accuracy and fast load transient response.

Packages available are in standard SOT89-5

and DIP8 for standard assembly and TO263-5,

SOP8 for SMD.

! TYPICAL APPLICATION CIRCUIT

C1 C2 D1 VOUT

IN IN

SHDN



OUT 2

FB 4

GND

AIC1594

R 1 sho rt and R2 open for fixed

swi tching output v ersion

1A Precision PWM DC/DC Regulator

AIC1594

1A STEP-DOWN PWM REGULATOR

SPEC NO: DS-1594-P1 03/23/00

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

! ORDERING INFORMATION



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

ORDER NUMBER PIN CONFIG URATION

AIC1594X- XXCX

AIC1594A(B)CM

AIC1594A(B)-25CM

AIC1594A(B)-33CM

AIC1594A(B)-50CM

AIC1594A(B)-12CM

(TO263-5)

FRON T VIEW

1: IN

2. OUT

3. GND

4. FB

5. SHDN

12345

AIC1594A(B)CT

AIC1594A(B)-25CT

AIC1594A(B)-33CT

AIC1594A(B)-50CT

AIC1594A(B)-12CT

(TO220-5)

12345

FRON T VIEW

1: IN

2. OUT

3. GND

4. FB

5.SHDN

AIC1594A(B)CN

AIC1594A(B)-25CN

AIC1594A(B)-33CN

AIC1594A(B)-50CN

AIC1594A(B)-12CN

(

DIP8

)

TOP VIEW

GND

SHDN

GND

OUT

IN 1

AIC1594A(B)CS

AIC1594A(B)-25CS

AIC1594A(B)-33CS

AIC1594A(B)-50CS

AIC1594A(B)-12CS

(SO8)

! 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.

AIC1594

1A STEP-DOWN PWM REGULATOR

SPEC NO: DS-1594-P1 03/23/00

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

! ELECTRICAL CHARAC TERISTICS (TJ=25°

°°

°C, VIN=18V)

PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT

Input Voltage 4.5 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

Fixed Output Voltage

AIC1594-12 (VIN > 15V ) 12.0 V

Feedback Voltage AIC1594 Adjustable 1.25 V

Output Voltage Regulation 4 %

Quiescent Current Internal switch off 1 5 mA

Shutdown Quiescent Current SHDN = 5V (OFF) 80 µA

Logic Input High (Regulator OFF) 2 V

Logic Input Low (Regulator ON ) 0.8 V

Oscillator Frequency AIC1594A series 150

Oscillator Frequency AIC1594B series 300 KHz

Output Current Limit 1.0 1.5 A

Over Voltage Protection 120 %

Maximum Duty Cycle 100 %

Efficiency Vo=5V , Io=2A 90 %

AIC1594

1A STEP-DOWN PWM REGULATOR

SPEC NO: DS-1594-P1 03/23/00

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

! 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.

PIN 2: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 3: GND Ground requires a short, low noise

connection to ensure good load

regulation.

PIN 4: FB Feedback input for fixed-output or

adjustable-output ver sion. 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 ref erence ,

control circuitry , and internal

switches .Drive low or connect to

GND for normal operation.

SO8, DI P8

PIN 1, 2: IN Supply voltage input for the IC switch-

ing regulator. A suitable input bypass

capacitor m ust be pr esent 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 ap-

proximately –0.5V, with a duty cycle of

approximately VOUT/VIN.

PIN 5, 6: GNDGround requires a short, low noise

connection to ensure good load regu-

lation.

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.

PIN 8: 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.

AIC1594

1A STEP-DOWN PWM REGULATOR

SPEC NO: DS-1594-P1 03/23/00

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

! BLOCK DIAGRAM

OUT

COMP.

GND

2.5V Regulator

1.25 V

Reference

Driver

Compensation

Circuit

SHDN

ON / OFF

AMP.

150/300

KHz OSC

Current

Limit

Latch

Thermal

Shutdown

! PHYSICAL DIMENSIONS

" 8 LEAD PLASTIC SO (unit: mm)

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

e 1.27(TYP)

H 5.80 6.20

L 0.40 1.27

AIC1594

1A STEP-DOWN PWM REGULATOR

SPEC NO: DS-1594-P1 03/23/00

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

" 8 LEAD PLASTIC DIP (unit: mm)

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