Datasheet

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General Description

The MAX8887/MAX8888 low-dropout linear regulators

operate from a 2.5V to 5.5V input and deliver up to

300mA continuous (500mA pulsed) current. The

MAX8887 is optimized for low-noise operation, while the

MAX8888 includes an open-drain power-OK (POK) ouput

flag. Both regulators feature exceptionally low 100mV

dropout at 200mA. These devices are available in a vari-

ety of preset output voltages in the 1.5V to 3.3V range.

An internal PMOS pass transistor allows the low 55µA

supply current to remain independent of load, making

these devices ideal for portable battery-powered equip-

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

lar phones, cordless phones, and notebook computers.

Other features include a micropower shutdown mode,

short-circuit protection, thermal shutdown protection,

and an active-low open-drain POK output that indicates

when the output is out of regulation. The

MAX8887/MAX8888 are available in a thin 5-pin SOT23

package that is only 1mm high.

________________________Applications

Notebook Computers

Wireless Handsets

PDAs and Palmtop Computers

Digital Cameras

PCMCIA Cards

Hand-Held Instruments

Features

♦ Guaranteed 300mA Output Current (500mA for

Pulsed Loads)

♦ Low 100mV Dropout at 200mA Load

♦ POK Output (MAX8888)

♦ 42µV

RMS

Output Noise (MAX8887)

♦ Preset Output Voltages (1.5V, 1.8V, 2.85V, and

3.3V)

♦ 55µA No-Load Supply Current

♦ Thermal-Overload and Short-Circuit Protection

♦ Foldback Output Current-Limit Protection

♦ 60dB PSRR at 1kHz

♦ 0.1µA Shutdown Current

♦ Thin 5-Pin SOT23 Package, 1mm High

MAX8887/MAX8888

Low-Dropout, 300mA Linear Regulators in SOT23

________________________________________________________________

Maxim Integrated Products

GND

BPSHDN

15OUTIN

MAX8887

TOP VIEW

GND

POKSHDN

15OUTIN

MAX8888

Pin Configurations

MAX8887

MAX8888

OFF

INPUT

2.5V TO 5.5V

SHDN

GND

(BP)

POK

OUT

300mA

2.2µF

OUT

2.2µF

0.01µF

( ) ARE FOR MAX8887 ONLY.

Typical Operating Circuit

19-1859; Rev 4; 7/09

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

T O P

MARK

M A X8 8 8 7 E Z K15+ T -40°C to +85°C 5 SOT23 ADQD

MAX8887EZK18+ T -40°C to +85°C 5 SOT23 ADPX

MAX8887EZK29+ T -40°C to +85°C 5 SOT23 ADPY

MAX8887EZK33+ T -40°C to +85°C 5 SOT23 ADPZ

MAX8887EZKxy+ T* -40°C to +85°C 5 SOT23 —

M A X8 8 8 8 E Z K15+ T -40°C to +85°C 5 SOT23 ADQE

MAX8888EZK18+ T -40°C to +85°C 5 SOT23 ADQA

MAX8888EZK18/V+ T -40°C to +85°C 5 SOT23 —

MAX8888EZK29+ T -40°C to +85°C 5 SOT23 ADQB

MAX8888EZK33+ T -40°C to +85°C 5 SOT23 ADQC

MAX8888EZKxy+ T* -40°C to +85°C 5 SOT23 —

Other versions (xy) between +1.5 and +3.3V are available in

100mV increments. Contact factory for other versions. Minimum

order quantity is 25,000 units.

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

/V denotes an automotive qualified part.

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.

Summary of content (9 pages)

PAGE 1
9-1859; Rev 4; 7/09 Low-Dropout, 300mA Linear Regulators in SOT23 The MAX8887/MAX8888 low-dropout linear regulators operate from a 2.5V to 5.5V input and deliver up to 300mA continuous (500mA pulsed) current. The MAX8887 is optimized for low-noise operation, while the MAX8888 includes an open-drain power-OK (POK) ouput flag. Both regulators feature exceptionally low 100mV dropout at 200mA. These devices are available in a variety of preset output voltages in the 1.5V to 3.3V range.
PAGE 2
MAX8887/MAX8888 Low-Dropout, 300mA Linear Regulators in SOT23 ABSOLUTE MAXIMUM RATINGS IN, SHDN, POK, to GND...........................................-0.3V to +7V OUT, BP to GND ............................................-0.3 to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW Operating Temperature Range ...........................
PAGE 3
Low-Dropout, 300mA Linear Regulators in SOT23 (VIN = VOUT + 1V, SHDN = IN, TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.1 2 µA SHUTDOWN SHDN = GND, VIN = 5.5V Shutdown Supply Current SHDN Input Threshold VIH 2.5V ≤ VIN ≤ 5.5V VIL 2.5V ≤ VIN ≤ 5.5V 1.6 V 0.6 SHDN Input Bias Current SHDN = IN or GND 10 100 nA OUT Discharge Resistance in Shutdown SHDN = GND 650 1100 Ω 92.5 95 % 5.5 V ISINK = 1mA 0.1 V VPOK = 5.
PAGE 4
Typical Operating Characteristics (continued) (Typical Operating Circuit, TA = +25°C, unless otherwise noted.) MAXIMUM VDROPOUT (mV) TA = +85°C 100 80 60 200 150 TYPICAL 100 TA = -40°C 40 50 20 0 50 100 150 200 250 100 ILOAD = 300mA 75 50 ILOAD = 0 0 2.5 300 125 25 0 0 MAX8887/8 toc06 IOUT = 200mA 250 GROUND-PIN CURRENT vs. INPUT VOLTAGE 150 GROUND-PIN CURRENT (µA) TA = +25°C 120 2.7 2.9 3.1 3.3 0 1.0 2.0 3.0 5.0 VOUT (V) INPUT VOLTAGE (V) GROUND-PIN CURRENT vs.
PAGE 5
Low-Dropout, 300mA Linear Regulators in SOT23 LOAD-TRANSIENT RESPONSE NEAR DROPOUT LINE-TRANSIENT RESPONSE MAX8887/8 toc13 MAX8887/8 toc12 300mA 4.5V IOUT 10mA VIN 4V VOUT 50mV/div AC-COUPLED VOUT 20mV/div AC-COUPLED VOUT = 3.3V VIN = 3.4V VOUT = 3.3V ILOAD = 100mA 100µs/div 10µs/div POK WAVEFORM SHUTDOWN WAVEFORM MAX8887/8 toc15 MAX8887/8 toc14 VSHDN VIN VOUT = 3.3V, RLOAD = 100Ω 2V/div 2V/div VOUT 1V/div DC-COUPLED VOUT 2V/div VPOK 2V/div VOUT = 3.
PAGE 6
MAX8887/MAX8888 Low-Dropout, 300mA Linear Regulators in SOT23 Detailed Description The MAX8887/MAX8888 are low-dropout, low-quiescent-current linear regulators designed primarily for battery-powered applications. The devices supply loads up to 300mA and are available in several fixed output voltages in the 1.5V to 3.3V range. The MAX8887 is optimized for low-noise operation, while the MAX8888 includes an open-drain POK output flag. As illustrated in Figure 1, the MAX8888 consists of a 1.
PAGE 7
Low-Dropout, 300mA Linear Regulators in SOT23 MAX8887/MAX8888 IN SHDN P MOS DRIVER WITH ILIMIT ERROR AMP SHUTDOWN LOGIC OUT MAX8888 POK THERMAL SENSOR 1.25V REF POK 95% REF GND Figure 1. Functional Diagram stability and optimum transient response. Surface-mount ceramic capacitors have very low ESR and are commonly available in values up to 10µF. Connect CIN and COUT as close to the MAX8887/MAX8888 as possible to minimize the impact of PC board trace inductance.
PAGE 8
MAX8887/MAX8888 Low-Dropout, 300mA Linear Regulators in SOT23 Package Information Chip Information TRANSISTOR COUNT: 620 PROCESS: BiCMOS 8 For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
PAGE 9
Low-Dropout, 300mA Linear Regulators in SOT23 REVISION NUMBER REVISION DATE 0 12/00 Initial release 1 12/01 Revised Output Voltage Selection section. 6 2 6/04 Revised Absolute Maximum Ratings. 2 3 11/06 Updated Ordering Information and package outlines. 4 7/09 Revised Ordering Information. DESCRIPTION PAGES CHANGED — 1, 8 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.