MAX6820UT+T Maxim Integrated Products, MAX6820UT+T Datasheet

MAX6820UT+T

Manufacturer Part Number

MAX6820UT+T

Description

IC SEQUENCER POWER SOT23-6

Manufacturer

Maxim Integrated Products

Type

Sequencerr

Datasheet

1.MAX6820UTT.pdf (8 pages)

Specifications of MAX6820UT+T

Number Of Voltages Monitored

Reset Timeout

140 ms Minimum

Voltage - Threshold

Adjustable/Selectable

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

SOT-23-6

Monitored Voltage

Adj

Undervoltage Threshold

Adj

Overvoltage Threshold

Adj

Manual Reset

Watchdog

Supply Voltage (max)

5.5 V

Supply Voltage (min)

0.9 V

Supply Current (typ)

60 uA (Typ)

Maximum Power Dissipation

696 mW

Mounting Style

SMD/SMT

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 40 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Output

Reset

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Other names

MAX6820UT+TTR

Current page: 1 of 8
Download datasheet (522Kb)

The MAX6819/MAX6820 are power-supply sequencers

for dual-voltage microprocessors (µPs) and multivoltage

systems. These devices monitor a primary supply voltage

and enable/disable an external n-channel MOSFET

switch for a secondary supply voltage. The MAX6819/

MAX6820 control local component voltage sequencing

when system power-on/power-off characteristics cannot

be guaranteed (supplies come from a multivoltage sys-

tem bus, silver box, or must be sequenced in different

modes for components on the same board). These small

power-supply sequencers improve system reliability.

The MAX6819/MAX6820 include an internal voltage ref-

erence/comparator with externally adjustable thresh-

olds to monitor the primary power supply. When the

primary supply is below the desired threshold, an exter-

nal secondary supply MOSFET switch is disabled.

When the primary supply exceeds the threshold, an

internal charge pump is activated and the external

MOSFET switch is enabled to connect the secondary

supply to the load. The charge pump fully enhances the

n-channel MOSFET switch to provide a very low R

support various supply sequencing priorities such as

The MAX6819 features a logic-driven EN input to

enable/disable the external MOSFET drive and includes

an internally fixed 200ms enable timeout period

MAX6820 allows the enable timeout period to be

adjusted with a single external capacitor. Both devices

are specified over the automotive temperature range

(-40°C to +125°C) and are available in space-saving

6-pin SOT23 packages.

19-1951; Rev 3; 12/05

Pin Configurations and Typical Operating Circuits

continued at end of data sheet.

Power PC is a trademark of IBM corp.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

I/O

PRIMARY GOOD

voltage drop. The devices can be connected to

before V

Dual-Voltage Microprocessors

Multivoltage Systems

Digital Signal Processors

Power PC™ Series Processors

CORE

________________________________________________________________ Maxim Integrated Products

or V

to V

CORE

General Description

SECONDARY ENABLE

before V

SOT23 Power-Supply Sequencers

Applications

I/O

). The

DS-

♦ Adjustable Primary Supply Voltage Monitor

♦ Internal Charge Pump to Enhance External

♦ Delay from Primary Supply Good to Secondary

♦ Logic Driven ENABLE Input (MAX6819)

♦ Immune to Short Voltage Transients

♦ Few External Components

♦ -40°C to +125°C Operating Temperature Range

♦ Small 6-Pin SOT23 Package

Products must be ordered in 2,500 piece increments.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

MAX6819UT-T

MAX6820UT-T

(Monitors Down to 0.62V)

Secondary Supply n-Channel MOSFET Switch

Supply Enabled

Factory Fixed 200ms (MAX6819)

Capacitor Adjustable (MAX6820)

PART

PRIMARY SUPPLY

(3.3V)

SECONDARY SUPPLY

(1.8V)

TOP VIEW

Typical Operating Circuits

SETV

-40°C to +125°C

GND

CC1

TEMP RANGE

Ordering Information

SETV

CC2

CC1

MAX6819

SOT23-6

MAX6819

Pin Configurations

GATE

GND

GATE

CC2

PIN-

PACKAGE

6 SOT23-6

OFF

DUAL-SUPPLY

BOARD OR µP

Features

AARF

AARG

M ARK

TOP

Related parts for MAX6820UT+T

MAX6820UT+T Summary of contents

Page 1

... Power PC™ Series Processors Pin Configurations and Typical Operating Circuits continued at end of data sheet. Power trademark of IBM corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. SOT23 Power-Supply Sequencers ♦ ...

Page 2

SOT23 Power-Supply Sequencers ABSOLUTE MAXIMUM RATINGS Referenced to GND .....................................................-0.3V to +6.0V CC1 CC2 SETV, SETD..................-0.3V to the higher of (V GATE ...................................................................-0.3V to +12.0V Input Current/Output Current (all pins) ...............................20mA Stresses beyond those listed ...

Page 3

A t vs. TEMPERATURE DELAY 250 240 230 220 210 200 190 180 170 160 150 -40 - TEMPERATURE (°C) GATE TURN-OFF TIME 20µs/div V vs. GATE VOLTAGE CC2 12 10 ...

Page 4

SOT23 Power-Supply Sequencers (T = +25°C, unless otherwise noted vs. TEMPERATURE SETV 0.65 0.64 0.63 0.62 0.61 0.60 0.59 -40 - TEMPERATURE (°C) I vs. V CC2 140 120 100 ...

Page 5

PIN NAME MAX6819 MAX6820 CC1 2 2 GND 3 3 SETV 4 — EN — 4 SETD 5 5 GATE CC2 Detailed Description Many dual-supply processors or multivoltage boards require one power supply to ...

Page 6

SOT23 Power-Supply Sequencers Applications Information Adjusting t The MAX6820 features a capacitor adjustable sequence delay. The adjustable delay provides power sequencing for a wide range of devices with different power-supply delay requirements. Connect a capacitor (C ) between SETD and ...

Page 7

SETV 5.5V CC2 GATE O Figure 3. Timing Diagram 5(V) PRIMARY VOLTAGE SUPPLY 3.3(V) SECONDARY VOLTAGE SUPPLY 1.8(V) THIRD VOLTAGE SUPPLY Figure 4. Sequencing Three Power Supplies 20 V CC1 18 V CC2 SETD ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Pin Configurations (continued) ...

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