AIC AIC1568 Datasheet

AIC1568

4-bit DAC, Simple PWM Power Regulator

 FEATURE

 Compatible with HIP6008.

 Simple Voltage-Mode PWM Control.

 Fast Transient Response.

 ±1.5% 4-Bit Digital-to-Analog Output Voltage.

 Adjustable Current Limit without External Sense

Resistors.

 Full 0% to 100% Duty Ratio.

 200KHz Free-Running Oscillator, Programmable

up to 350KHz.

 Power-Good Output Voltage Monitor.

 Short Circuit Protection with Low Short Circuit

Output Current.

 APPLICATIONS

 Power Supply for Pentium



PC

and Alpha Microprocessors.

 High-Power 5V to 3.xV DC/DC Regulators.

 Low-Voltage Distributed Power Supplies.

,

Pentium Pro

,

Power

 DESCRIPTION

The AIC1568 is a high power, high efficiency

switching regulator controller optimized for high

performance microprocessor applications. It is

designed to drive an N-channel MOSFET in a

standard buck topology. Featuring a digitally

programmable switching regulator, the AIC1568

includes monitoring and protection capabilities in

addition to all the essential PWM control

functions.

The internal 4-bit Digital-to-Analog Converter

(DAC) adjusts the output voltage from 2.0V to

3.5V in 0.1V increments. The precision reference

and voltage-mode control can provide output

regulation within ±1.5% over temperature and line

voltage shifts.

The internal oscillator of the AIC1568 free-runs at

200KHz and can be adjusted up to 350KHz. The

resulting PWM duty ratio ranges from 0% to 100%.

The error amplifier features a 11MHz bandwidth

and 6V/µS slew rate, which enables high

converter bandwidth for fast transient response.

The AIC1568 provides adjustable over current

and short circuit protections. It senses the output

current across the on resistance of the N-channel

MOSFET without an external low value sense

resistor. It also monitors the output voltage with a

window comparator and issues a power good

signal when the output is within 10% of the rated

output voltage.

Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw

DS-1568-00 TEL: [phone] FAX: [phone]

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 ORDERING INFORMATION

A

AIC1568 XX

PACKAGE TYPE
S: SMALL OUTLINE

TEMPERATURE RANGE
C: 0°C~70°C

ORDER NUMBER

AIC1568CS
(PLASTIC SO)

 TYPICAL APPLICATION CIRCUIT

C9

PIN CONFIGURATION

TOP VIEW

SS

VID0

VID1

VID2

VID3

COMP

FB

1

2

3

4

5

6

7

8

OCSET

AIC1568

16

VSEN

RT/OVP

15

VCC

14

BOOT

13

UGATE

12

PHASE

11

PGOOD

10

GND

9

1000P

R2

C8

0.1µF

JUMPER

C7

33P

C6

R6

90.9K
1000P

2.2K

OCSET
SS
VID0
VID1
VID2
VID3

COMP
FB

AIC1568

VSEN

RT/OVP

VCC

BOOT

UDRI

PHASE

PGOOD

GND

R5

3.01K
R7

1.2M

R1

10

C2

0.1µF

R4
15K

C1

1µF

RFP45N03L

M1

BYV118

R3 47K

C5

0.1µF

Switching Regulator for Pentium V

12V

CORE

V

DRI

+

D1

Supply

L1

1µH

C3

1000µF x 2

L2

7µH

C4

1000µF x 6

V

IN

5V

OUT

at 10

≤

3.5V

2.0V≤V

+

2

 ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V

Boot Voltage, V

Input, Output, or I/O Voltage ....................………….……….........

ESD Classification ....................................…….............……....……….................... Class 2

Recommended Operating Conditions

Supply Voltage, V

Ambient Temperature Range ....…................….……...........………..................... 0°C ~ 70°C

Junction Temperature Range ....…......................…..........…………................... 0°C ~100°C

Thermal Information

Thermal Resistance, θ

SOIC Package ...............................……………………………………........…. 100°C/W

SOIC Package (with 3 in

Maximum Junction Temperature (Plastic Package) ………………..……................... 150°C

Maximum Storage Temperature Range ………………………..........…......... -65°C ~150°C

Maximum Lead Temperature (Soldering 10 Sec) ……………..…………......…......... 300°C

BOOT

....…...............................................……………............................. 15V

CC

……….......................…...........…………........................................ 15V

GND - 0.3V to VCC+0.3V

....…...................................................…………….............. 12V±10%

CC

(Typical, Note 1)

JA

2

of Copper) …………………………………......….. 90°C /W

AIC1568

Note 1:

θ

is measured with the component mounted on an evaluation PC board in free air.

JA

 TEST CIRCUIT

Refer to TYPICAL APPLICATION CIRCUIT.

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