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MAX1792

500mA Low-Dropout

Linear Regulator in µMAX

19-1699; Rev 2; 11/11

For pricing, delivery, and ordering information, please contact Maxim Direct

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

General Description

The MAX1792 low-dropout linear regulator operates

from a +2.5V to +5.5V supply and delivers a guaran-

teed 500mA load current with low 130mV dropout. The

high-accuracy (±1%) output voltage is preset at an

internally trimmed voltage (see

Selector Guide

) or can

be adjusted from 1.25V to 5.0V with an external resis-

tive divider.

An internal PMOS pass transistor allows the low 80µA

supply current to remain independent of load, making

this device ideal for portable battery-operated equip-

ment such as personal digital assistants (PDAs), cellu-

lar phones, cordless phones, base stations, and

notebook computers.

Other features include an active-low open-drain reset

output with a 4ms timeout period that indicates when

the output is out of regulation, a 0.1µA shutdown mode,

short-circuit protection, and thermal shutdown protec-

tion. The device is available in a miniature 1.3W, 8-pin

power-µMAX package with a metal pad on the under-

side of the package.

________________________Applications

Notebook Computers

Cellular and Cordless Telephones

Personal Digital Assistants (PDAs)

Palmtop Computers

Base Stations

USB Hubs

Docking Stations

Features

o Guaranteed 500mA Output Current

o Low 130mV Dropout at 500mA

o Up to ±1% Output Voltage Accuracy

Preset at 1.5V, 1.8V, 2.5V, 3.3V, or 5.0V

Adjustable from 1.25V to 5.0V

o Reset Output with 4ms Timeout Period

o Low 80µA Ground Current

o 0.1µA Shutdown Current

o Thermal Overload Protection

o Output Current Limit

o Tiny 1.3W Power-µMAX Package

POWER-µMAX

SET

GND

SHDN

OUT

OUTIN

RST

TOP VIEW

MAX1792

Pin Configuration

MAX1792

1µF

OUT

3.3µF

RST

100k

= +2.5V TO +5.5V

OFF

SHDN

OUT

RST

GNDSET

µC

Typical Operating Circuit

Ordering Information

Selector Guide

PART AND SUFFIX V

OUT

μMAX TOP MARK

MAX1792EUA15+ 1.5V or Adj. AAAE

MAX1792EUA18+ 1.8V or Adj. AAAA

MAX1792EUA25+ 2.5V or Adj. AAAB

MAX1792EUA33+ 3.3V or Adj. AAAC

MAX1792EUA50+ 5.0V or Adj. AAAD

MAX1792EUA33/V+ 3.3V or Adj. AACP

PART* TEMP RANGE PIN-PACKAGE

MAX1792EUA_ _+ -40° C to +85°C 8 Power-μMAX

MAX1792EUA_ _/V+ -40° C to +85°C 8 Power-μMAX

Insert the desired two-digit suffix (see Selector Guide) into the

blanks to complete the part number.

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

Contact factory for other preset output voltages.

Summary of content (10 pages)

PAGE 1
MAX1792 500mA Low-Dropout Linear Regulator in µMAX General Description Features The MAX1792 low-dropout linear regulator operates from a +2.5V to +5.5V supply and delivers a guaranteed 500mA load current with low 130mV dropout. The high-accuracy (±1%) output voltage is preset at an internally trimmed voltage (see Selector Guide) or can be adjusted from 1.25V to 5.0V with an external resistive divider.
PAGE 2
MAX1792 500mA Low-Dropout Linear Regulator in µMAX ABSOLUTE MAXIMUM RATINGS IN, SHDN, RST, SET to GND ....................................-0.3V to +6V OUT to GND ................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration ........................................Indefinite Continuous Power Dissipation (TA = +70°C) 8-Pin Power-µMAX (derate 17mW/°C above +70°C) .......1.3W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature .......
PAGE 3
MAX1792 500mA Low-Dropout Linear Regulator in µMAX ELECTRICAL CHARACTERISTICS (continued) (VIN = VOUT(NOM) + 500mV, or VIN = +2.5V (whichever is greater), SHDN = IN, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.01 0.1 V 5.5 V 100 nA RESET OUTPUT Reset Output Low Voltage VOL RST sinking 1mA Operating Voltage Range for Valid Reset RST sinking 100μA RST Output High Leakage Current VRST = +5.
PAGE 4
MAX1792 500mA Low-Dropout Linear Regulator in µMAX ELECTRICAL CHARACTERISTICS (continued) (VIN = VOUT(NOM) + 500mV, or VIN = +2.5V (whichever is greater), SHDN = IN, TA = -40°C to +85°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN MAX UNITS 0.1 V 5.5 V 100 nA RESET OUTPUT Reset Output Low Voltage RST sinking 1mA VOL Operating Voltage Range for Valid Reset RST sinking 100μA RST Output High Leakage Current V RST = +5.5V RST Threshold RST Release Delay tRP 1.
PAGE 5
MAX1792 500mA Low-Dropout Linear Regulator in µMAX Typical Operating Characteristics (continued) (MAX1792EUA33, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 3.3µF, TA = +25°C, unless otherwise noted.) GROUND-PIN CURRENT vs. TEMPERATURE PSRR (dB) 80 75 -50 -40 -30 70 -20 -10 60 0 -15 10 35 60 85 0.01 0.1 1 10 100 TEMPERATURE (°C) FREQUENCY (kHz) OUTPUT SPECTRAL NOISE DENSITY vs. FREQUENCY OUTPUT NOISE DC TO 1MHz 10 COUT = 3.
PAGE 6
MAX1792 500mA Low-Dropout Linear Regulator in µMAX Typical Operating Characteristics (continued) (MAX1792EUA33, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 3.3µF, TA = +25°C, unless otherwise noted.) LOAD-TRANSIENT RESPONSE NEAR DROPOUT LINE-TRANSIENT RESPONSE MAX1792-13 MAX1792-14 6V IOUT 500mA/div VIN 1V/div 3V VOUT 50mV/div VOUT 10mV/div VIN = VOUT + 100mV CIN = 10μF ROUT = 660Ω TO 6.
PAGE 7
MAX1792 500mA Low-Dropout Linear Regulator in µMAX VIN = +2.5V TO +5.5V IN CIN 1µF IN THERMAL SENSOR MOSFET DRIVER WITH I LIM OUT ON VOUT = 1.25V TO 5.0V SHDN COUT 3.3µF OUT OFF SHUTDOWN LOGIC 5k VREF 1.25V ERROR AMPLIFIER LOGIC SUPPLY VOLTAGE (VOUT) RRST 100k R1 MAX1792 RST TO µC SET DELAY TIMER R2 93% VREF 100mV GND Figure 1. Functional Diagram Detailed Description The MAX1792 is a low-dropout, low-quiescent-current linear regulator designed primarily for battery-powered applications.
PAGE 8
MAX1792 500mA Low-Dropout Linear Regulator in µMAX Reset Output R1 = R2 IN OUT IN OUT VOUT 1.25V V IN = +2.5V TO +5.5V -1 VOUT CIN 1µF COUT 3.3µF MAX1792 R1 ON SHDN SET Current Limit OFF R2 RST GND Figure 2. Adjustable Output Using External Feedback Resistors The MAX1792 does not suffer from these problems and consumes only 110µA of quiescent current under heavy loads as well as in dropout.
PAGE 9
MAX1792 500mA Low-Dropout Linear Regulator in µMAX 0.7 POWER-μMAX PACKAGE OPERATING REGION AT TJ(MAX) = +150°C TA = +50°C CONTINUOUS CURRENT LIMIT 0.5 Noise, PSRR, and Transient Response TYPICAL VDROPOUT LIMIT MAXIMUM OUTPUT CURRENT (A) 0.6 0.1Ω or less to ensure stability and optimum transient response. Surface-mount ceramic capacitors have very low ESR and are commonly available in values up to 10µF.
PAGE 10
MAX1792 500mA Low-Dropout Linear Regulator in µMAX Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 9/00 Initial release 1 8/08 Updated Pin Description and Package Information 6, 10 — 2 11/11 Updated the Ordering Information and Selector Guide to include lead(Pb)-free and automotive qualified parts; added the soldering information to the Absolute Maximum Ratings section; added the Package Information table 1, 2, 9 Maxim Integrated cannot assume responsibility for us