LTC2924IGN datasheet(9/20 Pages) LINER

9 / 20 page

LTC2924

2924fa

Up to ﬁve supplies can be sequenced to a sixth master

supply by a single LTC2924 (Figure 4). The turn on of the

ﬁrst power supply is sensed by the ON pin. Power sup-

plies two through ﬁve are enabled by the OUT1 through

OUT4 pins, and their turn on sensed by the IN1 through

IN4 pins respectively. The last power supply is enabled

by the DONE pin, which is generally connected through

an inverter. This application is used where power supplies

are sequentially sequenced on and the turn off is simulta-

neous. Multiple LTC2924s can be cascaded to facilitate

sequencing of eight or more power supplies. See the

Cascading Multiple LTC2924s section.

APPLICATIO S I FOR ATIO

Selecting the Hysteresis Current and IN Pin Feedback

Resistors

The IN1-IN4 pins are connected to a sequenced power

supply with a resistive divider. The resistors are calculated

by ﬁrst selecting a hysteresis current, IHYS, and calculat-

ing RHYS:

A I

HYS

µ ≤

≤ µ

0 5

; .

For each sequenced power supply, choose a voltage

when the power supply is considered to be On during

Figure 4. 6-Power Supply Sequencer Block Diagram

OUT1

OUT2

OUT3

OUT4

DONE

FAULT

IN1

IN2

IN3

IN4

LTC2924

VCC

GND

2924 F04

SHDN

VOUT

PS1

SHDN

VOUT

PS2

SHDN

VOUT

PS3

SHDN

VOUT

PS4

SHDN

VOUT

PS5

SHDN

*VCC EARLY MUST BE ON BEFORE

SEQUENCING SUPPLIES

VOUT

PS6

TURN OFF

VCC EARLY*

SYSTEM

CONTROLLER

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