_______________General Description

The MAX1822 high-side supply, using a regulated

charge pump, generates a regulated output voltage

11V greater than the input supply voltage to power

high-side switching and control circuits. The MAX1822

allows low-resistance N-channel MOSFETs (FETs) to be

used in circuits that normally require costly, less effi-

cient P-channel FETs and PNP transistors. The high-

side output also eliminates the need for logic FETs in

+5V and other low-voltage switching circuits.

A +3.5V to +16.5V input supply range and a typical qui-

escent current of only 150µA make the MAX1822 ideal

for a wide range of line- and battery-powered switching

and control applications where efficiency is crucial.

Also provided is a logic-level power-ready output (PR)

to indicate when the high-side voltage reaches the

proper level.

The MAX1822 comes in an 8-pin SO package and

requires three inexpensive external capacitors. The

MAX1822 is a pin-for-pin replacement to the MAX622.

________________________Applications

High-Side Power Control with N-Channel FETs

Low-Dropout Voltage Regulators

Power Switching from Low Supply Voltages

H-Switches

Stepper Motor Drivers

Battery-Load Management

Portable Computers

____________________________Features

o +3.5V to +16.5V Operating Supply Voltage Range

o 150µA (typ) Quiescent Current

o Power-Ready Output

High-Side Power Supply

________________________________________________________________ Maxim Integrated Products

1

C2+

GND

1

2

8

7

C1-

C2-

PR

C1+

SO

TOP VIEW

3

4

6

5

MAX1822

Pin Configuration

MAX1822

+3.5V TO +16.5V

0.1

µF

CERAMIC

GND

+12.5V TO +27.5V

1

8

5

3

PR

7

C1

C3

4

C1+

C1-

C2+

C2-

6

2

C2

Typical Operating Circuit

19-1892; Rev 0; 1/01

PART

MAX1822ESA

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

8 SO

Ordering Information

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.