AIC AIC1566CS, AIC1566 Datasheet

AIC1566

4-bit DAC, Simple PWM Power Regulator With

Linear Controller

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

DS-1566-00 TEL: [phone] FAX: [phone]

1

 FEATURES

 Switching Regulator and Low Dropout Linear

Regulator on Single Chip.

 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, Pentium Pro, Power

PC, and Alpha Microprocessors.

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

 Low-Voltage Distributed Power Supplies.

 DESCRIPTION

The AIC1566 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 low

dropout linear regulator and a digitally

programmable switching regulator, the AIC1566

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 AIC1566 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

performance.

The AIC1566 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.

AIC1566

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 ORDERING INFORMATION

AIC1566 XX

PACKAGE TYPE
S: SMALL OUTLINE

TEMPERATURE RANGE
C: 0°C~70°C

PIN CONFIGURATION

ORDER NUMBER

AIC1566CS
(PLASTIC SO)

TOP VIEW

VSEN

RT/OVP

VCC

BOOT

UGATE

PHASE

PGOOD

GND

LIDRI

VLFB

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

OCSET

SS

VID0

VID1

VID2

VID3

COMP

FB

CLP

CLN

 TYPICAL APPLICATION CIRCUIT

90.9K

+

+

+

M1

OCSET

SS
VID0

VID1

VID2

VID3
COMP
FB

CLP+

CLN

VSEN

RT/OVP

VCC

BOOT

UGATE

PHASE

PGOOD

LIDRI

GND

VLFB

1000pF

R6

C6

33pF

C7

0.1µF

C8

1000pF

C9

2.2K

R2

137

1%

R11

1.2M

3.01K R12

R5

0.1µF

47K

C5

R3

L1

10A

5V

V

CORE

R1 10

1µF

12V

C1

FD3055

0.1µF

5V

C2

R10

237

1%

V

I/O

3.3V
10A

C10
1000µF

1µH

RFP45N03L

C3
1000µF x 2

7µH

C4
1000µF x 6

R4
15K

BYV118

D1

L2

AIC1566

Pentium Pro V

CORE

and V

I/O

Power Supply

AIC1566

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 ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VCC....…..............………………............................................................. 15V

Boot Voltage, V

BOOT

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

Input, Output or I/O Voltage .....................……………….……......... GND -0.3V to VCC+0.3V

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

Recommended Operating Conditions

Supply Voltage, VCC....….........………………….................................................... 12V ± 10%

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

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

Thermal Information

Thermal Resistance, θ

JA

(Typical, Note 1)

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

SOIC Package (with 3 in2 of Copper) …………………………..….……………….... 90°C/W

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

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

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

Note 1:

θ

JA

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

 TEST CIRCUIT

Refer to TYPICAL APPLICATION CIRCUIT.

 ELECTRICAL CHARACTERISTICS (VCC= 12V, Ta=25°

°°

°C, unless otherwise

specified.)

PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT

VCC Supply Current

Nominal Supply UGATE Open I

VCC

2 mA

Power-On Reset

VCC Threshold V

OCSET

=4.5V 7 8.5 V

Rising V

OCSET

Threshold 1.26 V

Reference and DAC

DACOUT Voltage Accuracy -1.5 +1.5 %

Oscillator

Free Running Frequency RT Open 170 200 230 KHz

Total Variation 6K≤RT≤200KΩ -20 +20 %

Ramp Amplitude RT Open ∆V

OSC

1.5 V

P-P