Datasheet

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

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.

General Description

The MAX8860 low-noise, low-dropout linear regulator

operates from a 2.5V to 6.5V input and is guaranteed to

deliver 300mA. Typical output noise for this device is

60µV

RMS

, and typical dropout is 105mV at 200mA. In

addition to the six available preset output voltages

(1.8V, 2.5V, 2.77V, 2.82V, 3V, and 3.3V), the Dual

Mode™ feature allows the device to be configured as

an adjustable output regulator from 1.25V to 6.5V.

Designed with an internal P-channel MOSFET pass tran-

sistor, the MAX8860 has a low 120µA supply current. An

output fault-detection circuit indicates loss of regulation.

Other features include a 10nA, logic-controlled shut-

down mode, short-circuit and thermal-shutdown protec-

tion, and reverse battery protection. The MAX8860 is

available in a miniature 8-pin µMAX package.

Applications

Wireless Handsets

DSP Core Power

PCMCIA Cards

Hand-Held Instruments

Palmtop Computers

Electronic Planners

Features

♦ High Output Current (300mA)

♦ Low Output Voltage Noise: 60µV

RMS

♦ Low 105mV Dropout at 200mA Output

♦ Low 120µA No-Load Supply Current

♦ Thermal Overload and Short-Circuit Protection

♦ Reverse Battery Protection

♦ 10nA Logic-Controlled Shutdown

♦ FAULT Indicator

♦ Small, Space-Saving µMAX Package

(1.1mm max height)

♦ Small 2.2µF Output Capacitor

Saves Space and Cost

MAX8860

Low-Dropout, 300mA

Linear Regulator in µMAX

________________________________________________________________ Maxim Integrated Products 1

FAULT

SHDN

SETOUT

GND

OUT

MAX8860

µMAX

TOP VIEW

MAX8860

OUT

SET

FAULT

GND

SHDN

2.2µF

33nF

OUTPUT

UP TO

300mA

INPUT

+2.5V TO

+6.5V

FAULT-

DETECT

OUTPUT

100kΩ

Typical Operating Circuit

19-1422; Rev 2; 1/01

MAX8860EUA18

MAX8860EUA28 -40°C to +85°C

-40°C to +85°C 8 µMAX

8 µMAX

Pin Configuration

Ordering Information

Dual Mode is a trademark of Maxim Integrated Products.

MAX8860EUA33 -40°C to +85°C 8 µMAX

PART TEMP RANGE

PIN-

PACKAGE

+1.80

+2.82

+3.30

OUT

(V)

+2.77MAX8860EUA27 -40°C to +85°C 8 µMAX

+2.50MAX8860EUA25 -40°C to +85°C 8 µMAX

MAX8860EUA30 -40°C to +85°C +3.008 µMAX

Summary of content (8 pages)

PAGE 1
9-1422; Rev 2; 1/01 Low-Dropout, 300mA Linear Regulator in µMAX Features ♦ High Output Current (300mA) ♦ Low Output Voltage Noise: 60µVRMS ♦ Low 105mV Dropout at 200mA Output ♦ Low 120µA No-Load Supply Current ♦ Thermal Overload and Short-Circuit Protection ♦ Reverse Battery Protection ♦ 10nA Logic-Controlled Shutdown ♦ FAULT Indicator ♦ Small, Space-Saving µMAX Package (1.1mm max height) ♦ Small 2.
PAGE 2
MAX8860 Low-Dropout, 300mA Linear Regulator in µMAX ABSOLUTE MAXIMUM RATINGS IN, SHDN to GND .......................................................-7V to +7V SHDN to IN ...............................................................-7V to +0.3V SET, CC, FAULT to GND ..........................................-0.3V to +7V OUT to GND .............................................. -0.3V to (VIN + 0.3V) FAULT Sink Current ...........................................................
PAGE 3
Low-Dropout, 300mA Linear Regulator in µMAX MAX8860 ELECTRICAL CHARACTERISTICS (continued) (VIN = 3.6V, CCC = 33nF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS IOUT = 10mA, 10Hz < f < 100kHz Output Voltage Noise Output Voltage Noise Density MIN TYP COUT = 2.2µF 65 COUT = 10µF 60 COUT = 100µF 55 10Hz < f < 100kHz, COUT = 10µF µVRMS nV√Hz 2.0 V VIL, 2.5V ≤ VIN ≤ 5.5V 0.
PAGE 4
Typical Operating Characteristics (continued) (VIN = VOUT + 0.5V, CIN = COUT = 2.2µF, CCC = 33nF, TA = +25°C, unless otherwise noted.) NO LOAD SUPPLY CURRENT vs.
PAGE 5
Low-Dropout, 300mA Linear Regulator in µMAX 0 FAULT 2V 0 VIN 4V 3V 4V 4V SHDN 2V 0 VIN 3V 3V VOUT VOUT 1V 1V 2V VOUT 1V 0 0 0 2V 2V MAX8860 toc15 MAX8860 toc13 FAULT 2V SHUTDOWN/POWER-UP POWER-DOWN RESPONSE 4V MAX8860 toc14 POWER-UP RESPONSE 4V 5ms/div 400µs/div 2ms/div Pin Description PIN NAME FUNCTION 1, 4 OUT 2 IN 3 GND Ground 5 SET Output Voltage Set. Connect to GND for internally set threshold. Connect to resistor-divider for adjustable output voltages.
PAGE 6
MAX8860 Low-Dropout, 300mA Linear Regulator in µMAX IN SHDN REVERSE BATTERY PROTECTION CC ERROR AMP P MOS DRIVER WITH ILIMIT SHUTDOWN LOGIC OUT MAX8860 SET FAULT DETECT THERMAL SENSOR FAULT 1.25V REF DUAL-MODE COMPARATOR 60mV GND Figure 1. Functional Diagram Internal P-Channel Pass Transistor The MAX8860 features a 0.5Ω typical P-channel MOSFET pass transistor. This provides several advantages over similar designs using PNP pass transistors, including longer battery life.
PAGE 7
Low-Dropout, 300mA Linear Regulator in µMAX Shutdown Drive SHDN low to place the MAX8860 in shutdown mode. In shutdown mode, the pass transistor, control circuit, reference, and all biases are turned off, reducing the supply current to typically 10nA. Connect SHDN to IN for normal operation. Current Limit The MAX8860 includes short-circuit protection. It includes a current limiter that controls the pass transistor’s gate voltage to limit the output current to about 770mA.
PAGE 8
MAX8860 Low-Dropout, 300mA Linear Regulator in µMAX VIN > +5.5V Minimum Load Current Requirements Power-Supply Rejection and Operation from Sources Other than Batteries When operating the MAX8860 with an input voltage above 5.5V, a minimum load current of 50µA is required to maintain regulation in preset voltage mode. When setting the output with external resistors, ensure that the minimum current through the external feedback resistors and load is at least 60µA.