MAXIM MAX1806 Technical data

General Description

The MAX1806 low-dropout linear regulator operates
from a +2.25V to +5.5V supply and delivers a guaran­teed 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 resis­tive-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 equip­ment, 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

Pin Configuration

Ordering Information

NC

MAX1806

IN

C

IN

1µF

C

OUT

10µF

R

POK

100kΩ

V

IN

+2.25V TO +5.5V

ON

OFF

SHDN

OUT

V

OUT

0.8V TO 4.5V

POK

GNDSET

TO
µC

Typical Operating Circuit

19-2018; Rev 0; 4/01

Selector Guide

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.

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

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

PART AND SUFFIX V

MAX1806EUA33 3.3 AAAG

MAX1806EUA25 2.5 AAAH

MAX1806EUA18 1.8 AAAI

MAX1806EUA15 1.5 AAAJ

MAX1806EUA08 0.8 AAAK

(V) TOP MARK

OUT

87OUT

MAX1806

µMAX

OUTIN

SET

6

GNDSHDN

5

TOP VIEW

POK

IN

1

2

3

4

MAX1806

500mA, Low-Voltage Linear Regulator in µMAX

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= V

OUT(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 T

A

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

IN, SHDN, POK, SET to GND ...................................-0.3V to +6V

OUT to GND ................................................-0.3V to (V

IN

+ 0.3V)

Output Short-Circuit Duration.....................................Continuous

Continuous Power Dissipation (T

A

= +70°C)

8-Pin Power-µMAX (derate 17mW/°C above +70°C).......1.3W

Operating Temperature .......................................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Dual Mode is a trademark of Maxim Integrated Products, Inc.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Voltage V

Input Undervoltage Lockout V

Output Voltage Accuracy
(Preset Mode)

Adjustable Output Voltage

SET Voltage Threshold
(Adjustable Mode)

Maximum Output Current I

Short-Circuit Current Limit I

SET Dual Mode™ Threshold 35 80 125 mV

SET Input Bias Current I

Ground-Pin Current I

Line Regulation ∆V
Load Regulation ∆V

Output Voltage Noise 10Hz to 1MHz, C

SHUTDOWN

Shutdown Supply Current I

SHDN Input Threshold

SHDN Input Bias Current I

Startup Time T

IN

UVLO

V

OUT

V

SET

OUT

LIM

SET

OFF

V

V

SHDN

STARTC OUT

Rising, 40mV hysteresis 1.85 2.0 2.15 V

TA = +85°C, I

TA = +85°C, I

OUT

OUT

TA = 0°C to +85°C, I

> V

OUT

+ 0.5V

OUT

OUT

V

IN

TA = +85°C, I

TA = +85°C, I

TA = 0°C to +85°C, I
V

> V

IN

V

OUT

V

SET

I

OUT

Q

I

OUT

OUT

LNRV I N

LDRIOUT

+ 0.5V

OUT

= 0V 700 1400 2300 mA

= +0.8V -100 +100 nA

= 1mA 210 400

= 500mA 575

= 500mA

fr om ( V

+ 100m V ) to 5.5V , I

OU T

= 1mA to 500mA 15.5 35 p p m /m A

SHDN = GND, VIN = 5.5V 0.02 5 µA

IH

IL

SHDN = GND or IN 10 100 nA

= 10µF, ti m e fr om SHD N hig h to P OK hig h40 µs

2.25 5.5 V

= 100mA -1 +1

= 1mA to 500mA -1.5 +1.5

= 1mA to 500mA,

OUT

-3 +3

0.8 4.5 V

= 100mA 790 810

= 1mA to 500mA 786 814

= 1mA to 500mA,

OUT

774 800 826

500 m A

V

= +2.25V 259 384

OUT

V

= +2.8V 201 315Dropout Voltage (Note 1) I

OUT

= +4.0V 147 255

V

OUT

= 5m A 0 0.125 %/V

L OA D

= 10µF (ESR < 0.1Ω) 300 µV

OUT

1.6

0.6

%

mV

RM S

µA

mV

RMS

V

MAX1806

500mA, Low-Voltage Linear Regulator in µMAX

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN= V

OUT(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 T

A

= +25°C.)

ELECTRICAL CHARACTERISTICS

(VIN= V

OUT(SETPOINT)

+ 500mV or VIN= +2.25V whichever is greater, SET = GND, SHDN = IN, TA= -40°C to +85°C, unless other-

wise noted. Typical values are at T

A

= +25°C.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER-OK

POK Output Low Voltage V

Operating Voltage Range for
Valid POK Output

Output High-Leakage Current V

Threshold Rising edge, referred to V

THERMAL PROTECTION

Ther m al S hutd own Tem p erature T
Thermal Shutdown Hysteresis ∆T

Sinking 2mA 5 50 mV

OL

Sinking 100µA 1.0 5.5 V

= +5.5V 100 nA

POK

OUT(NOMINAL)

SHDN

SHDN

90 93 96 %

170 °C

20 °C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Voltage V

Input Undervoltage Lockout V

Output Voltage Accuracy
(Preset Mode)

Adjustable Output Voltage

SET Voltage Threshold
(Adjustable Mode)

Maximum Output Current I

Short-Circuit Current Limit I

SET Dual Mode™ Threshold 35 125 mV

SET Input Bias Current I

Ground-Pin Current I

Dropout Voltage (Note 1) I

Line Regulation ∆V
Load Regulation ∆V

SHUTDOWN

Shutdown Supply Current I

SHDN Input Threshold

SHDN Input Bias Current I

IN

UVLO

V

OUTIOUT

Rising, 40mV hysteresis 1.85 2.15 V

= 1mA to 500mA -4 +4 %

2.25 5.5 V

0.8 4.5 V

V

SETIOUT

OUT

LIM

SET

Q

LNRV I N

LDRIOUT

OFF

V

IH

V

IL

SHDN

= 1mA to 500mA 766 834 mV

500 m A

V

= 0V 700 2500 mA

OUT

V

= +0.8V -100 +100 nA

SET

I

= 1mA 400 µA

OUT

V

= +2.25V 259 384

OUT

OUT

fr om ( V

= 500mA

OU T

V

= +2.8V 201 315

OUT

= +4.0V 147 255

V

OUT

+ 100m V ) to 5.5V , I

= 5m A -0.175 +0.175 %/V

L OA D

= 1mA to 500mA 35 p p m /m A

SHDN = GND, VIN = 5.5V 5 µA

2.5V < V

2.5V < V

< 5.5V 1.6

IN

< 5.5V 0.6

IN

SHDN = GND or IN 100 nA

RM S

mV

V