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廬

X80200, X80201, X80202, X80203, X80204

Data Sheet

January 21, 2005

FN8154.0

Power Supply Sequencer with Power-up

System Monitoring

The X80200 power sequencer provides a flexible approach

for handling difficult system power-up conditions. The

X80200 includes control of up to three voltage supplies and

can be cascaded to control additional supplies. The device

contains independent undervoltage lockout for each

controlled voltage.

The three voltage control circuits allow sequencing for

primary, core, and I/O voltages. The core and I/O supplies

are linked together with a comparator or a timer allowing a

tight coupling between these two supplies. The sequencing

may be either voltage based or time based.

The X80200 contains separate charge pumps to control

external N-channel power FETs for each of the supplies. The

charge pumps provide the high gate control voltage

necessary for efficient operation of the FET switches.

The X80200 turns on the primary voltage to the system

when the voltage source is steady. This primary FET switch

turn-on can be delayed with an external RC circuit. For the

secondary voltage sources, the device has a built-in 鈥渃ore-

up-first and core-down-last鈥?sequencing logic which is ideal

for high performance processors, DSPs and ASICs.

The serial bus can be used to monitor the status or turn off

each of the external power switches. The X80200 has 3

slave address bits that allow up to 8 devices to be connected

to the same bus.

Features

鈥?Sequence three voltage supplies independently

- Core and Logic I/O VCC power sequencer for processor

supplies

- Power up and power down control

- Voltage monitors have undervoltage lockout

- Internal charge pump drives external N-channel FET

switches

- Cascadable to sequence more than 3 supplies

- Time based or voltage based sequencing

鈥?Status register bits monitor gate output status

鈥?SMBus compatible Interface

鈥?Slave address identification for up to 8 power sequencers

(24 supplies) on the same bus

鈥?Surface mount 20-pin TSSOP Package

Applications

鈥?Distributed Power Supply Designs

鈥?Multi-voltage systems

鈥?Multiprocessor systems

鈥?Embedded Processor Applications

鈥?Digital Signal Processors, FPGAs, ASICs, Memory

Controllers

鈥?N + 1 Redundant Power Supplies

鈥?Support for SSI 鈥?Server System Infrastructure

Specifications

鈥?-48V Hotswap Power Backplane/Distribution

鈥?Card Insertion Detection and Power

Pinout

20 LD TSSOP

TOP VIEW

SETV

REF

A0

GND

A1

A2

NC

SDA

SCL

READY

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

VDDL

VDDM

VDDH

VFB

DNC

GATE_M

GATE_H

GATE_L

ENS

GATEH_EN

鈥?Power Sequencing DC-DC Supplies

鈥?Databus Power Interfacing

鈥?Custom Industrial Power Backplanes

鈥?Other: ATE, Data Acquisition, Mass Storage, Servers,

Data com, Wireless Basestations

Ordering Information

PART NUMBER

X80200V20I

X80201V20I

X80202V20I

X80203V20I

X80204V20I

UVLO

H

4.5

4.5

3.0

3.0

3.0

UVLO

M

3.0

2.25

2.25

2.25

0.9

UVLO

L

0.9

0.9

1.7

0.9

0.9

PACKAGE

TSSOP

TSSOP

TSSOP

TSSOP

TSSOP

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

|

Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright Intersil Americas Inc. 2005. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

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