Rainbow-electronics MAX8842 Manual do Utilizador descarregar pdf

General Description

The MAX8840/MAX8841/MAX8842 ultra-low-noise, low-

dropout (LDO) linear regulators are designed to deliver

up to 150mA continuous output current. These regula-

tors achieve a low 120mV dropout for 120mA load cur-

rent. The MAX8840 uses an advanced architecture to

achieve ultra-low output voltage noise of 11µV

RMS

and

PSRR of 54dB at 100kHz.

The MAX8841 does not require a bypass capacitor,

hence achieving the smallest PC board area. The

MAX8842 output voltage can be adjusted with an exter-

nal divider.

The MAX8840/MAX8841 are preset to a variety of volt-

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

MOSFET series pass transistor, the MAX8840/MAX8841/

MAX8842 maintain very low ground current (40µA).

The regulators are designed and optimized to work with

low-value, low-cost ceramic capacitors. The MAX8840

requires only 1µF (typ) of output capacitance for stability

with any load. When disabled, current consumption drops

to below 1µA.

The MAX8840/MAX8841/MAX8842 are available in a tiny

1mm x 1.5mm x 0.8mm µDFN.

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 1.0mm x 1.5mm x 0.8mm µDFN

♦ 11µV

RMS

Output Noise at 100Hz to 100kHz

Bandwidth (MAX8840)

♦ 78dB PSRR at 1kHz (MAX8840)

♦ 120mV Dropout at 120mA Load

♦ Stable with 1µF Ceramic Capacitor for Any Load

♦ Guaranteed 150mA Output

♦ Only Need Input and Output Capacitors (MAX8841)

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

2.85V, 3V, 3.3V, 4.5V (MAX8840/MAX8841) and

Adjustable (MAX8842)

♦ Low 40µA Ground Current

♦ Excellent Load/Line Transient

♦ Overcurrent and Thermal Protection

MAX8840/MAX8841/MAX8842

Ultra-Low-Noise, High PSRR, Low-Dropout,

150mA Linear Regulators in µDFN

________________________________________________________________ Maxim Integrated Products 1

μDFN

(1.5mm x 1.0mm)

TOP VIEW

GND

BP (MAX8840)

N.C. (MAX8841)

FB (MAX8842)

SHDN

OUT

N.C.

MAX8840

MAX8841

MAX8842

Pin Configuration

Ordering Information

MAX8840

OUTPUT PRESET

1.5V TO 4.5V

INPUT

2V TO 6V

OFF

SHDN

10nF

OUT

1μF

OUT

GND

Typical Operating Circuits

19-0629; Rev 1; 1/07

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.

*xy is the output voltage code (see the Output Voltage Selector

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

100mV increments. Contact factory for other versions.

+Denotes lead-free package.

PART* TEMP RANGE PIN-PACKAGE

MAX8840ELTxy+T -40°C to +85°C

6 µDFN-6

1.5mm x 1.0mm

MAX8841ELTxy+T -40°C to +85°C

6 µDFN-6

1.5mm x 1.0mm

MAX8842ELT+T -40°C to +85°C

6 µDFN-6

1.5mm x 1.0mm

Typical Operating Circuits continued at end of data sheet.

Output Voltage Selector Guide appears at end of data sheet.

1 2 3 4 5 6 7 8 9 10

MAX8840/MAX8841/MAX8842 1

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Página 1 - MAX8840/MAX8841/MAX8842

General DescriptionThe MAX8840/MAX8841/MAX8842 ultra-low-noise, low-dropout (LDO) linear regulators are designed to deliverup to 150mA continuous outp

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MAX8840/MAX8841/MAX8842Ultra-Low-Noise, High PSRR, Low-Dropout,150mA Linear Regulators in µDFNMaxim cannot assume responsibility for use of any circui

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MAX8840/MAX8841/MAX8842Ultra-Low-Noise, High PSRR, Low-Dropout,150mA Linear Regulators in µDFN2 ______________________________________________________

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MAX8840/MAX8841/MAX8842Ultra-Low-Noise, High PSRR, Low-Dropout,150mA Linear Regulators in µDFN________________________________________________________

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MAX8840/MAX8841/MAX8842Ultra-Low-Noise, High PSRR, Low-Dropout,150mA Linear Regulators in µDFN________________________________________________________

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MAX8840/MAX8841/MAX8842Ultra-Low-Noise, High PSRR, Low-Dropout,150mA Linear Regulators in µDFN6 ______________________________________________________

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MAX8840/MAX8841/MAX8842Ultra-Low-Noise, High PSRR, Low-Dropout,150mA Linear Regulators in µDFN________________________________________________________

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Rainbow-electronics MAX8842 Manual do Utilizador

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