MAX1822EPA Datasheet, PDF (1/10 Pages) Maxim Integrated Products – High-Side Power Supply

19-1892; Rev 0; 1/01
High-Side Power Supply
_______________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.
____________________________Features
o +3.5V to +16.5V Operating Supply Voltage Range
o Output Voltage Regulated to V_CC + 11V (typ)
o 150µA (typ) Quiescent Current
o Power-Ready Output
PART
MAX1822ESA
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 SO
________________________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
Typical Operating Circuit
+3.5V TO +16.5V
0.1µF
CERAMIC
C1
C2
8
C3
1
C1+
V_CC
7 _C1-
V_OUT ^{5 +12.5V TO +27.5V}
6
C2+
MAX1822
2 _C2-
GND
4
3
PR
Pin Configuration
TOP VIEW
C1+ 1
C2- 2
PR 3
GND 4
MAX1822
8 V_CC
7 C1-
6 C2+
5 V_OUT
SO
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