MAX1810 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Network Interface Card Smart Regulator

19-1678; Rev 0; 4/00
Network Interface Card Smart Regulator
General Description
The MAX1810 powers peripheral component intercon-
nect (PCI) Ethernet network interface cards (NICs),
modem cards, and other devices that utilize both the
main and auxiliary (standby) voltages supplied by PCI-
compliant systems. The device generates an uninter-
rupted +3.3V at up to 500mA from either a +5V main or
a +5V standby supply. When both +5V inputs fall below
+4.1V, an internal switch connects the +3.3V auxiliary
input to the output.
An auxiliary switch resistance of only 0.18Ω minimizes
output droop from the +3.3V auxiliary supply. In addi-
tion, the MAX1810 guarantees that no reverse current
flows from the output to any unbiased or inactive input,
and remains stable with as little as 1µF of output
bypass capacitance at its output.
The MAX1810 is available in a compact 8-pin high-
power (0.9W) SO package.
________________________Applications
PCI Adapter Cards
Network Interface Cards
Modem Cards
Features
o Uninterrupted +3.3V Output
o Up to 500mA Output Current
o High-Power 0.9W SO-8 Package
o Thermal and Overcurrent Protection
o Only 1µF Output Capacitor
o Internal 0.18Ω +3.3V Auxiliary Switch
o No Reverse Current to Inactive Inputs
PART
MAX1810ESA
Ordering Information
TEMP. RANGE
-40^oC to +85^oC
PIN-PACKAGE
8 SO
Typical Operating Circuit
+5V MAIN
MAIN
OUT
INPUT
+5V STBY
INPUT
STBY ^MAX1810
+3.3V AUX
AUX
GND
INPUT
OUT
+3.3V, 500mA
C_OUT
1.0µF
TOP VIEW
Pin Configuration
STBY 1
MAIN 2
OUT 3
AUX 4
MAX1810
8 GND
7 GND
6 GND
5 GND
SO
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