AN022 datasheet(1/8 Pages) AIC

Teilenummer	AN022

Bauteilbeschribung	High Side Driver for Buck Converter

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Hersteller	AIC [Analog Intergrations Corporation]

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AN022

February, 2002

1

High Side Driver for Buck Converter with an LDO

Introduction

Most boost converters have been applied to step-up

voltage applications, such as the PDA, N/B PC, cellular

phone, palmtop computer, GPS, camcorder, portable

DVD, toy, and DSC, to elevate a low voltage to a high

voltage to provide low quiescent current and high

efficiency regulator in the recent years. Yet, technically,

the boost converter does not supply applications of

high loading current today. Also, the LDO usually can

not transform to a relatively high energy.

AIC1630A is not only a boost converter but also an

application of step-down and a low-dropout function.

The circuit, shown as Fig. 1, can step down from 5V or

12V to as low as 2.5V, 1.8V and 1.25V with 80%

efficiencies. A linear controller can be implemented by

using the pin 6 and 7 of AIC1630A, as shown Fig. 1.

And it works well at low input voltages. For example, a

2.5V input, which comes from the output of AIC1630A,

can be converted into an output of 1.8V. Due to the

ultra-low dropout voltage, the power dissipation is

much lower than the general LDO’s.

Principle of operation

The principle of energy storage in the inductor L can be

applied to the buck converter. And the inductor energy

then is to be transferred to the output via the schootky

diode D. When the switch is on, the diode is used as a

reverse biased and the inductor current will ramp up.

When the switch is off, the inductor reverses its polarity

with a switch current to maintain output voltage.

1. AIC1630A driving P-MOSFET

+

C1

820

µF

R2

270

C4

680P

R3

36K

L1

47

µH

R5

20K

R4

62K

R7

20K

R6

9.1K

+

C2

470

µF

1.8V

5V— 12V

+

C3

1500

µF

D1

1N4148

SD

1

VIN

2

EXT

3

GND

4

FB 5

LBO 6

LBI

7

VOUT 8

U1

AIC1630A

C5

0.1

µF

R1

1.8K

2.5V

U4

CEM4435

U3

2N2222

U5

D45H2A

R9

1M

R8

2.2

U2

2N2222

D2

1N5820

D3

5.1V

C6

820PF

Fig. 1

AIC1630A+LDO for P-MOSFET Circuit

Ähnliche Beschreibung - AN022

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