LTC4358 datasheet(5/14 Pages) AD

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LTC4450

Rev. 0

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PIN FUNCTIONS

GND (Pin 14): Device Ground.

IN (Pins 2 - 7): Input Voltage and Positive Supply. IN is

the ideal diode anode and source of the internal N-channel

MOSFET. Connect these pins to the power supply input

that delivers power to the load. Bypass with a 0.1µF or

larger capacitor to suppress load transients.

OUT (Pins 8 - 13): Output Voltage. OUT is the ideal diode

cathode and drain of the internal N-channel MOSFET. This

is the common output when multiple LTC4450s are diode

OR-ed. Bypass with a 0.1µF or larger capacitor.

SHDN# (Pin 16): Shutdown Control Input. Driving this

pin below 0.4V (VSHDN#(TH)) disables the internal MOSFET

between IN and OUT and lowers the current consumption

of LTC4450 below 5µA. STATUS is pulled low to indicate

that the LTC4450 is disabled. When driven low, a con-

nection from IN to OUT still exists through the MOSFET’s

body diode. Driving SHDN# above 0.85V (VSHDN#(TH)) +

0.07V (VSHDN#(HYS)) enables the LTC4450, allowing it to

operate as an ideal diode. Connect to the highest on IN

or VCC or when not used. If the highest supply voltage is

changing over time due to supplies being swapped in and

out, connect SHDN# to a diode-OR of IN and VCC when

not used.

STATUS (Pin 15): Gate Status Output. STATUS pulls low

when the gate of the N-channel MOSFET is pulled low

indicating that the LTC4450 operates in reverse bias or

in shutdown. Otherwise, STATUS pulls high indicating

that the LTC4450 is operating in forward bias. Connect

through a pull-up resistor to the highest of IN or VCC. If

the highest supply voltage is changing over time due to

supplies being swapped in and out, connect to a diode-OR

of IN and VCC. Leave open or tie to GND when not used.

VCC (Pin 1): Positive Supply Input. This pin provides aux-

iliary power for the LTC4450 when VIN < 2.75V. Connect

to ground if unused.

BLOCK DIAGRAM

GND

VCC

CHARGE

PUMP

CPO

SHDN#

0.85V

4450 BD

15mV

INTERNAL

N-CHANNEL MOSFET

OUT

STATUS

+–

–

OTA

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