MAX6471 MAXIM [Maxim Integrated Products], MAX6471 Datasheet

MAX6471

Manufacturer Part Number

MAX6471

Description

300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

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The MAX6469–MAX6484 are low-dropout linear regula-

tors with a fully integrated microprocessor reset circuit.

Each is available with preset output voltages from +1.5V

to +3.3V in 100mV increments and delivers up to 300mA

of load current. These devices consume only 82µA of

supply current. The low supply current, low dropout volt-

age, and integrated reset functionality make these

devices ideal for battery-powered portable equipment.

The MAX6469–MAX6484 include a reset output that indi-

cates when the regulator output drops below standard

microprocessor supply tolerances (-7.5% or -12.5% of

nominal output voltage). This eliminates the need for an

external microprocessor supervisor, while ensuring that

supply voltages and clock oscillators have stabilized

before processor activity is enabled. Push-pull and open-

drain active-low reset outputs are available, with reset

timeout periods of 2.5ms, 20ms, 150ms, or 1200ms (min).

The MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–

MAX6484 also have a shutdown feature that reduces the

supply current to 0.1µA (typ). The MAX6471–MAX6474/

MAX6479–MAX6482 offer a manual reset input to assert a

microprocessor reset while the regulator output is within

specification. The MAX6475/MAX6476/MAX6483/

MAX6484 feature a remote feedback sense pin for use

with an external NPN transistor for higher-current applica-

tions. The MAX6469–MAX6476 are available in 6-pin

SOT23 and 8-pin thin QFN packages. The MAX6477–

MAX6484 are available in a 3 × 3 chip-scale package

(UCSP™). All devices are specified for operation from

-40°C to +85°C.

19-2532; Rev 2; 6/03

UCSP is a trademark of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

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.

Hand-Held Instruments (PDAs, Palmtops)

PCMCIA Cards/USB Devices

Cellular/Cordless Telephones

CD/DVD Drives

Notebook Computers

Digital Cameras

Bluetooth Modules/Wireless LAN

________________________________________________________________ Maxim Integrated Products

General Description

Internal Microprocessor Reset Circuit

Applications

300mA LDO Linear Regulators with

o 3

o Preset +1.5V to +3.3V Output (100mV Increments)

o SET Pin for Adjustable Output Voltage

o 75µV

o ±2.0% Accuracy Over Temperature

o Guaranteed 300mA Output Current

o Low Dropout Voltage

o 82µA Supply Current, 0.1µA Shutdown Current

o Input Reverse Current, Thermal and Short-Circuit

o Microprocessor Reset with Four Timeout Options

o Push-Pull or Open-Drain RESET

o Manual Reset Input

o Remote Feedback Sense

*Future product—contact factory for availability.

Note: The first “_ _”are placeholders for the output voltage levels

of the devices. Desired output voltages are set by the suffix found

in the Output Voltage Suffix Guide (Table 1). The third “_” is a

placeholder for the reset threshold accuracy. Desired reset

threshold accuracy is set by the suffix found in the Reset

Threshold Accuracy Guide (Table 2). The “_” following the D is a

placeholder for the reset timeout delay time. Desired reset timeout

delay time is set by the suffix found in the Reset Timeout Delay

Guide (Table 3). For example, the MAX6481BL30BD4-T has a

3.0V output voltage, 12.5% reset threshold tolerance, and a

1200ms (min) reset timeout delay. Sample stock is generally avail-

able on standard versions only (Table 4). Standard versions

require a minimum order increment of 2.5k units. Nonstandard

versions must be ordered in 10k-unit increments. Contact factory

for availability.

Ordering Information continued at end of data sheet.

MAX6469UT_ _ _D_-T

MAX6469TA_ _ _D_*

MAX6470UT_ _ _D_-T

MAX6470TA_ _ _D_*

(MAX6477–MAX6484)

Protection

55mV at 150mA

114mV at 300mA

3 UCSP, 6-Pin SOT23, and 8-Pin QFN Packages

RMS

PART

LDO Output Voltage Noise

Ordering Information

-40°C to +85°C

TEMP RANGE

Features

PIN-

PACKAGE

6 SOT23-6

8 Thin QFN

6 SOT23-6

8 Thin QFN

Related parts for MAX6471

MAX6471 Summary of contents

Page 1

... The MAX6469/MAX6470/MAX6473–MAX6478/MAX6481– MAX6484 also have a shutdown feature that reduces the supply current to 0.1µA (typ). The MAX6471–MAX6474/ MAX6479–MAX6482 offer a manual reset input to assert a microprocessor reset while the regulator output is within specification. The MAX6475/MAX6476/MAX6483/ ...

Page 2

LDO Linear Regulators with Internal Microprocessor Reset Circuit ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) IN, SHDN, OUT, FB ..................................................-0.3V to +7V MR, SET .......................................................-0. RESET (push-pull) ...................................-0. RESET (open drain)..................................................-0.3V ...

Page 3

LDO Linear Regulators with Internal ELECTRICAL CHARACTERISTICS (continued 0.5V) or +2.5V, whichever is greater OUT unless otherwise noted.) (Note 2) PARAMETER SYMBOL Dropout Voltage (Notes 3, 4) Output Current Limit Input Reverse Leakage ...

Page 4

LDO Linear Regulators with Internal Microprocessor Reset Circuit ELECTRICAL CHARACTERISTICS (continued 0.5V) or +2.5V, whichever is greater OUT unless otherwise noted.) (Note 2) PARAMETER SYMBOL MR Input Low Voltage MR Input High Voltage ...

Page 5

LDO Linear Regulators with Internal ( 3.3V 3.3µ OUT OUT DROPOUT VOLTAGE vs. LOAD CURRENT 125 V = 3.3V OUT C = 3.3µF OUT 100 ...

Page 6

LDO Linear Regulators with Internal Microprocessor Reset Circuit ( 3.3V 3.3µ OUT OUT LINE TRANSIENT RESPONSE MAX6469 toc13 5V 4.5V V OUT 20mV/div AC-COUPLED V = 3.3V OUT I = 10mA ...

Page 7

... MAX6469/MAX6470/MAX6477/MAX6478 Pin Description PIN BUMP MAX6469/MAX6470 MAX6477/MAX6478 SOT23 QFN UCSP MAX6471/MAX6472/MAX6479/MAX6480 Pin Description PIN BUMP MAX6471/MAX6472 MAX6479/MAX6480 SOT23 QFN UCSP _______________________________________________________________________________________ ...

Page 8

LDO Linear Regulators with Internal Microprocessor Reset Circuit MAX6473/MAX6474/MAX6481/MAX6482 Pin Description PIN BUMP MAX6473/MAX6474 MAX6481/MAX6482 SOT23 QFN UCSP MAX6475/MAX6476/MAX6483/MAX6484 ...

Page 9

... V _______________________________________________________________________________________ Microprocessor Reset Circuit MANUAL RESET Regulator ( ) ARE FOR MAX6471/MAX6472/MAX6479/MAX6480 ONLY Figure 1. Adjustable Output Voltage Configuration the reset threshold. RESET asserts when MR is pulled low (MAX6471–MAX6474/MAX6479–MAX6482). RESET asserts when SHDN is pulled low (MAX6469/ MAX6470/MAX6473–MAX6478/MAX6481–MAX6484). ...

Page 10

LDO Linear Regulators with Internal Microprocessor Reset Circuit remotely sense the output voltage of the device. Using FB with an external NPN transistor, the current drive capability can be increased according to the following equation (Figure 2 ...

Page 11

LDO Linear Regulators with Internal cool. The thermal sensor turns the pass transistor on again after the IC’s junction temperature cools by 20°C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection is designed to ...

Page 12

LDO Linear Regulators with Internal Microprocessor Reset Circuit Power Dissipation Consideration For the SOT23 package, any pin except the SET pin can be used as a heatsink. If the SET pin is used as a heatsink, excessive parasitic capacitance ...

Page 13

... MAX6470TA28AD3 MAX6470UT285AD3 MAX6470UT285BD3 MAX6470TA30BD3 MAX6470TA33AD3 MAX6470UT15BD3 MAX6470UT18AD3 MAX6470UT25BD3 MAX6470UT28AD3 MAX6470UT30BD3 MAX6470UT33AD3 MAX6471TA15AD3 MAX6471TA18BD3 MAX6471TA25AD3 MAX6471TA28BD3 MAX6471TA30AD3 MAX6471TA33BD3 MAX6471UT15AD3 MAX6471UT18BD3 MAX6471UT25AD3 ______________________________________________________________________________________ Microprocessor Reset Circuit TOP MARK MAX6471UT28BD3 ADO MAX6471UT30AD3 ADP MAX6471UT33BD3 ADQ MAX6472TA15AD3 ACT MAX6472TA18BD3 ADR MAX6472TA25AD3 ADS MAX6472TA28BD3 ABKS MAX6472TA30AD3 ...

Page 14

LDO Linear Regulators with Internal Microprocessor Reset Circuit Table 4. Standard Versions (continued) DEVICE MAX6474TA28BD3 MAX6474TA30AD3 MAX6474TA33BD3 MAX6474UT15AD3 MAX6474UT18BD3 MAX6474UT25AD3 MAX6474UT28BD3 MAX6474UT30AD3 MAX6474UT33BD3 MAX6475TA15BD3 MAX6475TA18AD3 MAX6475TA25BD3 MAX6475TA28AD3 MAX6475TA30BD3 MAX6475TA33AD3 MAX6475UT15BD3 MAX6475UT18AD3 MAX6475UT25BD3 MAX6475UT28AD3 MAX6475UT30BD3 MAX6475UT33AD3 MAX6476TA15BD3 MAX6476TA18AD3 MAX6476TA25BD3 MAX6476TA28AD3 ...

Page 15

... UCSP UCSP A1 IN OUT C1 MAX6479 MAX6483 A2 C2 GND FB MAX6480 MAX6484 A3 MR RESET UCSP UCSP Pin Configurations OUT MAX6471 GND 2 5 SET MAX6472 RESET SOT23 OUT IN 2 MAX6473 7 OUT MAX6474 GND SHDN ...

Page 16

... RESET GND 16 ______________________________________________________________________________________ IN SHDN* PROTECTION OUT CURRENT LIMIT FB OUTPUT RESET STAGE *MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–MAX6484 **MAX6469–MAX6472/MAX6477–MAX6480 ***MAX6471–MAX6474/MAX6479–MAX6482 TRANSISTOR COUNT: 1041 PROCESS: BiCMOS V CC µP RESET GND Functional Diagrams THERMAL SENSOR REVERSE LEAKAGE MOS DRIVER WITH CURRENT LIMIT ERROR ...

Page 17

... LDO Linear Regulators with Internal Ordering Information (continued) PART TEMP RANGE MAX6471UT_ _ _D_-T -40°C to +85°C MAX6471TA_ _ _D_* -40°C to +85°C MAX6472UT_ _ _D_-T -40°C to +85°C MAX6472TA_ _ _D_* -40°C to +85°C MAX6473UT_ _ _D_-T -40°C to +85°C MAX6473TA_ _ _D_* -40°C to +85°C MAX6474UT_ _ _D_-T -40° ...

Page 18

... LDO Linear Regulators with Internal Microprocessor Reset Circuit SHDN PART SET √ √ MAX6469 √ √ MAX6470 √ MAX6471 — √ MAX6472 — √ MAX6473 — √ MAX6474 — √ MAX6475 — √ MAX6476 — √ √ MAX6477 √ √ ...

Page 19

LDO Linear Regulators with Internal (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Microprocessor Reset Circuit Package Information PACKAGE OUTLINE, SOT-23, 6L 21-0058 ...

Page 20

LDO Linear Regulators with Internal Microprocessor Reset Circuit (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages PIN 1 INDEX AREA COMMON DIMENSIONS ...

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