AIC AIC1562CS, AIC1562 Datasheet

AIC1562

µ

High-Efficiency, Bootstrapped DC/DC Converter

 FEATURES

 3V to 20V Input Voltage Operation.

 Internal 800mA Switch.

 Bootstrapped Driver for N-Channel MOSFET.

 High Efficiency (up to 90%).

 Fast Transient Response.

 Internal ±2% Reference.

 Low Quiescent Current at 1.6mA.

 Frequency Operation from 200Hz to 200KHz.

 APPLICATIONS

 CPU Power Supplies for Mother Boards.

 DC/DC Converters for CPU VRMs.

 Step-Down DC-DC Converter Module.

TYPICAL APPLICATION CIRCUIT



C3

1N4148

R2

24K

C2
220pF

D3

R1
1K

0.022µF

C4

Z1

5.1V

Q2

2N2907A

BYV118

VIN

GND

AIC1741

CPU Power Supply for P5 Mother Board

12V

C1

47µF

D2
1N4148

SC

BST

AIC1562

+

VCC

FB

C11, C12: Ceramic Capacitor
L1: Iron Powder Core
V

= (1+R10/1K)x1.235V

OUT

0.1µF

SE

TC

GND

R8
10K

MTD20N03DH

D1

FB

VOUT

 DESCRIPTION

The AIC1562 is a high performance monolithic

DC/DC converter drive IC with output-

bootstrapping capability, designed specifically for

driving N-channel MOSFET to achieve maximum

possible power conversion efficiency. The device

consists of an internal temperature compensated

reference, comparator, controlled duty cycle

oscillator, bootstrapped driver and a 800mA output

switch. Working with the AIC1741, a low power

adjustable regulator, the AIC1562 works at 100%

duty cycle under heavy load transient conditions to

minimize transient response time, making it an idea

precision switching power solution to stringent

requirements on computer mother boards.

V

+
F

1000

R8
1K

C10

IN

C11

0.1µF
x2

Q1

L1

7.5µF

R7
470

+

1000µF/6.3Vx2

C8, C9

C5

0.1µF

R9
1K

5V

V

R10

OUT

C12

0.1µF
x2

: 2.5V~3.5V/10A

1000µF/6.3V

x5

C13

MICROPROCESSOR

P5

CPU

+

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

DS-1562-00 Jan 30, 01 TEL: [phone] FAX: [phone]

1

 ORDERING INFORMATION

A

AIC1562

IC1562 XX

PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE

TEMPERATURE
C: 0°C~+70°C

ORDER NUMBER

AIC1562CN
(PLASTIC DIP)

AIC1562CS
(PLASTIC SO)

PIN CONFIGURATION

TOP VIEW

SC

1

SE

2

3

TC

4

GND

 ABSOLUTE MAXIMUM RATINGS

Supply Voltage ...............................................…………………....................................... 20V

Comparator Input Voltage Range .........................…………….............................. -0.3V~20V

Switch Collector Voltage ....................................………………...................................... 20V

Switch Emitter Voltage ......................................…………………................................... 20V

Switch Collector to Emitter Voltage .......................……………..................................... 20V

Driver Collector Voltage .....................................………………..................................... 20V

Switch Current ...............................................................…...………………........…........... 1A

Power Dissipation and Thermal Characteristics

DIP Package

Ta= 25°C ................................…………........................... 1.0W

Thermal Resistance ..........………............................... 100°C/W

SO Package

Ta= 25°C ...........................……………......................... 625mW

Thermal Resistance ...............……….......................... 160°C/W

Operating Junction Temperature .............................…………................................... 125°C

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

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

BST

8

7

NC

VCC

6

5

FB

 TEST CIRCUIT

2

0.8A
Current Source

2V/0V
I

DISCHARG

C

T

AIC1562

R1

1K

1

SC

2

SE

3

TC

4

/ I

CHG

1nF

GND

AIC1562

BST

NC

VCC

FB

8

7

6

5

VCC

40mA
Current Source

VCC

1.275V

1.225V

3