Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - LDO voltage regulator Positivbe, adjustable SC 70 5

General Description

The MAX8891/MAX8892 low-dropout (LDO) linear regu-

lators are designed to deliver up to 150mA continuous

output current. These regulators achieve a low 120mV

dropout for 120mA load current.

The MAX8891 only requires an input/output capacitor,

hence achieving the smallest PCB area. The

MAX8892’s output voltage can be adjusted with an

external divider.

The MAX8891 is preset to a variety of voltages in the

1.5V to 4.5V range. Designed with a p-channel

MOSFET series pass transistor, the MAX8891/MAX8892

maintain very low ground current (40µA).

The regulators are designed and optimized to work with

low-value, low-cost ceramic capacitors. The MAX8891/

MAX8892 require only 1µF (typ) of output capacitance

for stability with any load. When disabled, current con-

sumption drops to below 1µA.

These regulators are available in a tiny 5-pin SC70

package.

Applications

Cellular and Cordless Phones

PDA and Palmtop Computers

Base Stations

Bluetooth Portable Radios and Accessories

Wireless LANs

Digital Cameras

Personal Stereos

Portable and Battery-Powered Equipment

Features

♦ Space-Saving SC70 Package

♦ 65dB PSRR at 10kHz

♦ 120mV Dropout at 120mA Load

♦ Stable with 1µF Ceramic Capacitor for Any Load

♦ Guaranteed 150mA Output

♦ Only Need Input and Output Capacitors (MAX8891)

♦ Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,

2.85V, 3V, 3.3V, 4.5V (MAX8891) and Adjustable

(MAX8892)

♦ Low 40µA Ground Current

♦ Excellent Load/Line Transient

♦ Overcurrent and Thermal Protection

High PSRR, Low-Dropout, 150mA

Linear Regulators

MAX8891/MAX8892

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

GND

N.C. (MAX8891)

FB (MAX8892)

SHDN

OUT

MAX8891/

MAX8892

SC70

TOP VIEW

Pin Configuration

MAX8891

OUTPUT PRESET

1.5V TO 4.5V

INPUT

2V TO 6V

OFF

SHDN

OUT

= 1μF

OUT

GND

MAX8892

OUTPUT ADJUSTABLE

1.5V TO 4.5V

INPUT

2V TO 6V

OFF

SHDN

OUT

= 1μF

OUT

GND

Typical Operating Circuits

Ordering Information

19-4537; Rev 1; 12/11

xy is the output voltage code (see Output Voltage Selector

Guide). Other versions between 1.5V and 4.5V are available in

100mV increments. Contact factory for other versions.

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

/V denotes an automotive qualified part.

PART* TEMP RANGE PIN-PACKAGE

MAX8891EXKxy+T -40°C to +85°C 5 SC70

MAX8891EXKxy/V+T -40°C to +85°C 5 SC70

MAX8892EXK+T -40°C to +85°C 5 SC70

Output Voltage Selector Guide appears at end of data sheet.

Summary of content (8 pages)

PAGE 1
MAX8891/MAX8892 High PSRR, Low-Dropout, 150mA Linear Regulators General Description The MAX8891/MAX8892 low-dropout (LDO) linear regulators are designed to deliver up to 150mA continuous output current. These regulators achieve a low 120mV dropout for 120mA load current. The MAX8891 only requires an input/output capacitor, hence achieving the smallest PCB area. The MAX8892’s output voltage can be adjusted with an external divider. The MAX8891 is preset to a variety of voltages in the 1.5V to 4.5V range.
PAGE 2
MAX8891/MAX8892 High PSRR, Low-Dropout, 150mA Linear Regulators ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to +7V Output Short-Circuit Duration.....................................Continuous OUT, SHDN to GND ....................................-0.3V to (VIN + 0.3V) FB, BP, N.C. to GND ................................-0.3V to (VOUT + 0.3V) Continuous Power Dissipation (TA = +70°C) 5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............0.
PAGE 3
MAX8891/MAX8892 High PSRR, Low-Dropout, 150mA Linear Regulators Typical Operating Characteristics (VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, TA = +25°C, unless otherwise noted.) 1.5 IOUT = 120mA 0.2 0 -0.2 0.5 -0.4 0.0 -0.6 MAX8891/2 toc03 IOUT = 1mA 0.8 0.6 % DEVIATION (%) 2.0 1.0 0.4 % DEVIATION (%) IOUT = 0mA 1.0 MAX8891/2 toc02 2.5 OUTPUT VOLTAGE (V) 0.6 MAX8891/2 toc01 3.0 OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT OUTPUT VOLTAGE vs.
PAGE 4
MAX8891/MAX8892 High PSRR, Low-Dropout, 150mA Linear Regulators Typical Operating Characteristics (continued) (VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, TA = +25°C, unless otherwise noted.) LOAD TRANSIENT RESPONSE dl/dt = 0.5mA/μs LOAD TRANSIENT RESPONSE dl/dt = 5mA/μs MAX8891/2 toc10 50mA 10mA MAX8891/2 toc11 50mA VIN = 3.5V ILOAD 25mA/div 10mA dl/dt = 0.5mA/μs LOAD TRANSIENT RESPONSE dl/dt = 20mA/μs 10mA MAX8891/2 toc12 50mA VIN = 3.5V ILOAD 25mA/div 10mA dl/dt = 0.5mA/μs VIN = 3.
PAGE 5
MAX8891/MAX8892 High PSRR, Low-Dropout, 150mA Linear Regulators Pin Description PIN NAME MAX8891 MAX8892 1 1 IN 2 2 GND FUNCTION Unregulated Input Supply Ground 3 3 SHDN — 4 FB 4 — N.C. Not Internally Connected 5 5 OUT Regulated Output Voltage. Bypass with a capacitor to GND. See the Capacitor Selection and Regulator Stability section for more details. Shutdown. Pull low to disable the regulator.
PAGE 6
MAX8891/MAX8892 High PSRR, Low-Dropout, 150mA Linear Regulators Thermal-Overload Protection Thermal-overload protection limits total power dissipation in the MAX8891/MAX8892. When the junction temperature exceeds TJ = +160°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool down.
PAGE 7
MAX8891/MAX8892 High PSRR, Low-Dropout, 150mA Linear Regulators Functional Diagram IN SHDN SHUTDOWN AND POWER-ON CONTROL ERROR AMP MAX8891/ MAX8892 MOS DRIVER WITH ILIMIT P OUT * THERMAL SENSOR FB** 1.225V REFERENCE * GND *MAX8891 ONLY **MAX8892 ONLY Chip Information Output Voltage Selector Guide PART V OUT (V) TOP MARK PROCESS: BiCMOS MAX8891EXK15+T 1.5 ATI Package Information MAX8891EXK18+T 1.8 ATJ MAX8891EXK25+T 2.5 ATL MAX8891EXK26+T 2.6 ATM MAX8891EXK28+T 2.
PAGE 8
MAX8891/MAX8892 High PSRR, Low-Dropout, 150mA Linear Regulators Revision History REVISION NUMBER REVISION DATE 0 3/09 1 12/11 DESCRIPTION Initial release PAGES CHANGED — Added the /V option to the Ordering Information table and the Output Voltage Selector Guide; updated the Package Information table 1, 7 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied.