Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LDO voltage regulator Positivbe, adjustable TSSOP 14 EP

General Description

The MAX8526/MAX8527/MAX8528 low-dropout linear

regulators operate from input voltages as low as 1.425V

and are able to deliver up to 2A of continuous output

current with a maximum dropout voltage of only 200mV.

The output voltage can be set from 0.5V to (V

- 0.2V)

and is 1.4% accurate over load and line variations, from

0°C to +85°C.

These regulators use small, 2.2µF ceramic input capaci-

tors and 10µF ceramic output capacitors to deliver 2A

output current. High bandwidth provides excellent tran-

sient response and limits the output voltage deviation to

45mV for a 20mA to 2A load step, with only a 10µF

ceramic output capacitor, and the voltage deviations can

be reduced further by increasing the output capacitor.

Designed with an internal p-channel MOSFET pass

transistor, the MAX8526/MAX8527/MAX8528 feature

low 500µA typical supply current during dropout condi-

tions. Soft-start reduces inrush current. Other features

include a logic-controlled shutdown mode, short-circuit

protection, and thermal-overload protection.

The MAX8527 features a power-OK (POK) output that

transitions high when the regulator output is within

±10% of its nominal output voltage. The MAX8528 fea-

tures a 150ms power-on reset (POR) output.

The parts are packaged in a 14-pin TSSOP package,

which includes an exposed pad for optimal power

dissipation.

Applications

Servers

Networking

Storage

Base Stations

Optical Modules

Post Regulators

Notebooks

PDAs

ATE

Features

o 1.425V to 3.6V Input Voltage Range

o Guaranteed 200mV Dropout at 2A Output Current

o ±0.6% Initial Accuracy

o ±1.4% Output Accuracy over

Load/Line/Temperature (0°C to +85°C)

o Compatible with Ceramic Capacitors

o Fast Transient Response

o 440µA Operating Supply Current

o <50µA Shutdown Supply Current

o Short-Circuit Protection

o Thermal-Overload Protection

o Soft-Start Limits Inrush Current

o 5mm x 6.4mm Footprint, 1.1mm Profile

MAX8526/MAX8527/MAX8528

1.425V to 3.6V Input, 2A,

0.2V Dropout LDO Regulators

________________________________________________________________

Maxim Integrated Products

MAX8526

MAX8527

MAX8528

2.2µF

10µF

INPUT

1.425V TO 3.6V

OUTPUT

0.5V TO (V

- 0.2V), 2A

POWER-ON RESET

POWER-OK

OFF

IN_

POR (MAX8528)

POK (MAX8527)

EN GND

OUT_

Typical Operating Circuit

Ordering Information

19-3190; Rev 2; 8/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Pin Configurations appear at end of data sheet.

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

/V Denotes an automotive qualified part.

PART TEMP RANGE PIN-PACKAGE

MAX8526EUD -40°C to +85°C 14 TSSOP

MAX8526EUD+ -40°C to +85°C 14 TSSOP

MAX8527EUD -40°C to +85°C 14 TSSOP

MAX8527EUD+ -40°C to +85°C 14 TSSOP

MAX8527EUD/V+ -40°C to +85°C 14 TSSOP

MAX8528EUD -40°C to +85°C 14 TSSOP

MAX8528EUD+ -40°C to +85°C 14 TSSOP

EVALUATION KIT

AVAILABLE

Summary of content (10 pages)

PAGE 1
9-3190; Rev 2; 8/09 KIT ATION EVALU E L B AVAILA 1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators The MAX8526/MAX8527/MAX8528 low-dropout linear regulators operate from input voltages as low as 1.425V and are able to deliver up to 2A of continuous output current with a maximum dropout voltage of only 200mV. The output voltage can be set from 0.5V to (VIN - 0.2V) and is 1.4% accurate over load and line variations, from 0°C to +85°C. These regulators use small, 2.
PAGE 2
MAX8526/MAX8527/MAX8528 1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators ABSOLUTE MAXIMUM RATINGS IN, EN, POK (MAX8527), POR (MAX8528), FB to GND ........................................................-0.3V to +4.0V OUT to GND ..................................................-0.3V to (IN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C, EP soldered to PC board ground) 14-Pin TSSOP (derate 20.8mW/°C above +70°C).............
PAGE 3
1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators (Circuit of Figure 1: VIN = +1.8V, VOUT = +1.5V, EN = IN, IOUT = 2mA, TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS GND GND Supply Current GND Shutdown Current VIN = 3.6V, VOUT = 3V, IOUT = 20mA 440 Dropout, VIN = 3.6V, VFB = 480mV 500 800 VIN = 3.6V, EN = GND 0.5 50 µA µA POK (MAX8527 Only) Power-OK Threshold VFB moving out of regulation, VHYS = 10mV, IN = 1.425V to 3.
PAGE 4
Typical Operating Characteristics (Typical values are: VIN = +1.8V, VOUT = +1.5V, IOUT = 2A, COUT =10µF, CIN = 2.2µF, and TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE vs. LOAD CURRENT 1.50 1.45 1.40 1.499 1.498 1.497 TA = +85°C 1.496 1.495 1.494 TA = +25°C 1.493 TA = -40°C 700 MAX8526/27/28 toc03 1.500 ILOAD = 2A 600 GROUND CURRENT (µA) OUTPUT VOTAGE (V) 1.55 GROUND CURRENT vs. INPUT VOLTAGE MAX8526/27/28 toc02 TA = -40°C TO +85°C OUTPUT VOLTAGE (V) 1.
PAGE 5
1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators FB VOLTAGE vs. TEMPERATURE PSRR vs. FREQUENCY (MAX8526) 501 500 FB VOLTAGE (mV) 60 50 40 30 20 499 498 497 496 10 495 ILOAD = 100mA ILOAD = 20mA 494 -10 0.1 1 10 100 -40 1000 -15 10 35 60 FREQUENCY (kHz) TEMPERATURE (°C) OUTPUT RIPPLE VOLTAGE OVERCURRENT THRESHOLD vs. TEMPERATURE MAX8526/27/28 toc11 VOUT 1mV/div AC-COUPLED 85 MAX8526/27/28 toc12 OVERCURRENT THRESHOLD (A) 4.0 3.9 3.8 3.7 3.6 3.
PAGE 6
1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators MAX8526/MAX8527/MAX8528 Pin Description PIN NAME FUNCTION MAX8526 MAX8527 MAX8528 1 1 1 EN Enable Input. Set low to place the device in low-current shutdown mode. Set high for normal operation. 2–5 2–5 2–5 IN Regulator Input. VIN can range from 1.425V to 3.6V. Bypass with a 2.2µF or higher ceramic capacitor to GND. 6, 7, 14 7, 14 6, 14 T.P. 8 8 8 GND 9 9 9 FB 10–13 10–13 10–13 OUT Regulator Output.
PAGE 7
1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators The MAX8526/MAX8527/MAX8528 are low-input, lowdropout, PMOS regulators capable of delivering up to 2A of output current with as little as 200mV of headroom from input to output. The PMOS output stage can be driven from input voltages down to +1.425V without sacrificing stability or transient performance. Since this regulator has a PMOS output device, supply current is not a significant function of load or input headroom.
PAGE 8
MAX8526/MAX8527/MAX8528 1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators Operating Region and Power Dissipation The maximum power dissipation depends on the thermal resistance of the IC package and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipated in the device is P = IOUT x (VIN - VOUT). The package features an exposed thermal pad on its underside.
PAGE 9
1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators TOP VIEW EN 1 14 T.P. EN 1 14 T.P. EN 1 14 T.P. IN 2 13 OUT IN 2 13 OUT IN 2 13 OUT IN 3 12 OUT IN 3 12 OUT IN 3 12 OUT 11 OUT IN 4 10 OUT IN 5 IN 4 MAX8526 IN 5 MAX8527 11 OUT IN 4 10 OUT IN 5 MAX8528 11 OUT 10 OUT T.P. 6 9 FB POK 6 9 FB T.P. 6 9 FB T.P. 7 8 GND T.P.
PAGE 10
MAX8526/MAX8527/MAX8528 1.425V to 3.6V Input, 2A, 0.2V Dropout LDO Regulators Revision History REVISION NUMBER REVISION DATE 0 2/04 Initial release 1 5/05 Added lead-free versions in the Ordering Information and updated the Ordering Information and the Pin Description. 2 8/09 Added automotive version of the MAX8527. DESCRIPTION PAGES CHANGED — 1, 6, 8 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.