Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LDO voltage regulator Positive, fixed or adjustable uMax 8 EP

General Description

The MAX1806 low-dropout linear regulator operates

from a +2.25V to +5.5V supply and delivers a guaran-

teed 500mA load current with low 175mV dropout. The

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

internally trimmed voltage (see Selector Guide) or can

be adjusted from +0.8V to +4.5V with an external resis-

tive-divider.

An internal PMOS pass transistor allows low 210µA

supply current, making this device ideal for portable

equipment such as personal digital assistants (PDAs),

cellular phones, cordless phones, and other equip-

ment, including base stations and docking stations.

Other features include an active-low, power-OK output

that indicates when the output is out of regulation, a

0.02µA shutdown mode, short-circuit protection, and

thermal shutdown protection. The MAX1806 comes in a

miniature 1.3W, 8-pin power-µMAX package with a

metal pad on the underside of the package.

Applications

Notebook Computers

Cellular and Cordless Telephones

PDAs

Palmtop Computers

Base Stations

USB Hubs

Docking Stations

Features

♦ Guaranteed 500mA Output Current

♦ Output Down to 0.8V

♦ Low 175mV Dropout at 500mA

♦ ±1% Output Voltage Accuracy

Preset at 0.8V, 1.5V, 1.8V, 2.5V, or 3.3V

Adjustable from 0.8V to 4.5V

♦ Power-OK Output

♦ Low 210µA Ground Current

♦ 0.02µA Shutdown Current

♦ Thermal Overload Protection

♦ Output Current Limit

♦ Tiny 1.3W, 8-Pin Power-µMAX Package

MAX1806

500mA, Low-Voltage Linear Regulator in µMAX

________________________________________________________________ Maxim Integrated Products 1

SET

GNDSHDN

OUT

OUTIN

POK

µMAX

TOP VIEW

MAX1806

Pin Configuration

Ordering Information

MAX1806

1µF

OUT

10µF

POK

100kΩ

+2.25V TO +5.5V

OFF

SHDN

OUT

0.8V TO 4.5V

POK

GNDSET

µC

Typical Operating Circuit

19-2018; Rev 0; 4/01

PART T EM P. R A N G E PIN-PACKAGE

MAX1806EUA_ _ -40°C to +85°C 8 Power-µMAX

Selector Guide

PART AND SUFFIX V

OUT

(V) TOP MARK

MAX1806EUA33 3.3 AAAG

MAX1806EUA25 2.5 AAAH

MAX1806EUA18 1.8 AAAI

MAX1806EUA15 1.5 AAAJ

MAX1806EUA08 0.8 AAAK

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.

Summary of content (10 pages)

PAGE 1
9-2018; Rev 0; 4/01 500mA, Low-Voltage Linear Regulator in µMAX Applications Features ♦ Guaranteed 500mA Output Current ♦ Output Down to 0.8V ♦ Low 175mV Dropout at 500mA ♦ ±1% Output Voltage Accuracy Preset at 0.8V, 1.5V, 1.8V, 2.5V, or 3.3V Adjustable from 0.8V to 4.5V ♦ Power-OK Output ♦ Low 210µA Ground Current ♦ 0.02µA Shutdown Current ♦ Thermal Overload Protection ♦ Output Current Limit ♦ Tiny 1.3W, 8-Pin Power-µMAX Package Ordering Information PART MAX1806EUA_ _ TEMP.
PAGE 2
MAX1806 500mA, Low-Voltage Linear Regulator in µMAX ABSOLUTE MAXIMUM RATINGS IN, SHDN, POK, SET to GND ...................................-0.3V to +6V OUT to GND ................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin Power-µMAX (derate 17mW/°C above +70°C) .......1.3W Operating Temperature .......................................-40°C to +85°C Junction Temperature ....
PAGE 3
500mA, Low-Voltage Linear Regulator in µMAX (VIN = VOUT(SETPOINT) + 500mV or VIN = +2.25V whichever is greater, SET = GND, 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 5 50 mV 5.5 V 100 nA 96 % POWER-OK POK Output Low Voltage VOL Operating Voltage Range for Valid POK Output Sinking 2mA Sinking 100µA 1.0 Output High-Leakage Current VPOK = +5.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VIN = VOUT(SETPOINT) + 500mV or VIN = +2.25V whichever is greater, SET = GND, SHDN = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 50 mV 5.5 V 100 nA 97 % POWER-OK POK Output Low Voltage VOL Sinking 2mA Operating Voltage Range for Valid POK Output Sinking 100µA 1.0 Output High-Leakage Current VPOK = +5.
PAGE 5
00mA, Low-Voltage Linear Regulator in µMAX GROUND-PIN CURRENT vs. LOAD CURRENT VIN = 3.8V 300 250 200 190 -50 -40 180 170 160 -10 100 200 300 400 500 600 700 800 -40 -15 LOAD CURRENT (A) 10 35 60 0.01 85 0.1 1 10 100 1000 FREQUENCY (kHz) TEMPERATURE (°C) OUTPUT SPECTRAL NOISE DENSITY vs. FREQUENCY OUTPUT NOISE DC TO 1MHz COUT = 10µF IOUT = 50mA MAX1806 toc10 MAX1806 toc11 10 OUTPUT SPECTRAL NOISE DENSITY (µV/√Hz) COUT = 10µF IOUT = 50mA 0 150 1 VOUT 1mV/div 0.1 0.
PAGE 6
MAX1806 500mA, Low-Voltage Linear Regulator in µMAX Typical Operating Characteristics (continued) (MAX1806EUA33, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 10µF, TA = +25°C, unless otherwise noted.) LOAD-TRANSIENT RESPONSE NEAR DROPOUT LINE-TRANSIENT RESPONSE MAX1806 toc14 MAX1806 toc15 6V VIN 1V/div IOUT 200mA/div 3V VOUT 50mV/div VIN = VOUT + 100mV CIN = 10µF ROUT = 660Ω TO 6.
PAGE 7
500mA, Low-Voltage Linear Regulator in µMAX The MAX1806 is a low-dropout, low-quiescent-current linear regulator. The device supplies loads up to 500mA and is available with preset output voltages. As illustrated in Figure 1, the MAX1806 includes a 0.8V reference, error amplifier, P-channel pass transistor, and internal feedback voltage-divider. The reference is connected to the error amplifier, which compares it with the feedback voltage and amplifies the difference.
PAGE 8
MAX1806 500mA, Low-Voltage Linear Regulator in µMAX VIN +2.25V TO +5.5V IN CIN 1µF IN THERMAL SENSOR MOSFET DRIVER WITH ILIM PRESET MODE OUT ON VOUT 0.8V TO 3.3V SHDN OUT OFF SHUTDOWN LOGIC COUT 10µF VREF 0.8V ERROR AMPLIFIER LOGIC SUPPLY VOLTAGE (VOUT) RPOK 100kΩ MAX1806 POK TO µC SET 93% VREF 80mV GND Figure 1. Functional Diagram ing a direct heat conduction path from the die to the PC board.
PAGE 9
500mA, Low-Voltage Linear Regulator in µMAX MAX1806 0.8 IN VOUT 0.8V OUT VIN +2.25V TO +5.5V VOUT IN CIN 1µF OUT COUT 10µF MAX1806 R1 ON SHDN CONTINUOUS CURRENT LIMIT -1 0.7 MAXIMUM OUTPUT CURRENT (A) R1 = R2 0.6 TA = +50°C 0.5 0.4 TA = +85°C TA = +70°C 0.3 TYPICAL VDROPOUT LIMIT 0.2 POWER-µMAX PACKAGE OPERATING REGION AT TJ(MAX) = +150°C 0.1 SET OFF 0 0 R2 POK GND 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V) Figure 3.
PAGE 10
500mA, Low-Voltage Linear Regulator in µMAX 8L, µMAX, EXP PAD.EPS MAX1806 Package Information Note: The MAX1806 has on exposed thermal pad on the bottom side of the package. 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.