mic49300 Micrel Semiconductor, mic49300 Datasheet

mic49300

Manufacturer Part Number

mic49300

Description

Mic49300 3.0a Low Voltage Ldo Regulator W/dual Input Voltages

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC49300.pdf (8 pages)

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Current page: 1 of 8
Download datasheet (592Kb)

General Description

The MIC49300 is a high-bandwidth, low-dropout, 3.0A volt-

age regulator ideal for powering core voltages of low-power

microprocessors. The MIC49300 implements a dual supply

conﬁ guration allowing for very low output impedance and

very fast transient response.

The MIC49300 requires a bias input supply and a main input

supply, allowing for ultra-low input voltages on the main supply

rail. The input supply operates from 1.4V to 6.5V and the bias

supply requires between 3V and 6.5V for proper operation.

The MIC49300 offers ﬁ xed output voltages from 0.9V to 1.8V

and adjustable output voltages down to 0.9V.

The MIC49300 requires a minimum of output capacitance for

stability, working optimally with small ceramic capacitors.

The MIC49300 is available in a 5-pin S-Pak. It operates over

a junction temperature range of –40°C to +125°C.

Typical Application

August 2005

BIAS

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

= 3.3V

BIAS

Ceramic

= 1µF

Fast Transient Response Regulator

= 1.5V

MIC49300BR

IN IN

BIAS

Low Voltage,

GND

OUT

ADJ

OUT

Ceramic

= 1.0V

OUT

= 10µF

Features

• Input Voltage Range:

• Stable with 1µF ceramic capacitor

• ±1% initial tolerance

• Maximum dropout voltage (V

• Adjustable output voltage down to 0.9V

• Ultra fast transient response (Up to 10MHz bandwidth)

• Excellent line and load regulation speciﬁ cations

• Logic controlled shutdown option

• Thermal shutdown and current limit protection

• Power S-Pak package

• Junction temperature range: –40°C to 125°C

Applications

• Graphics processors

• PC Add-In Cards

• Microprocessor core voltage supply

• Low voltage digital ICs

• High Efﬁ ciency Linear power supplies

• SMPS post regulators

3.0A Low Voltage LDO Regulator w/Dual Input Voltages

temperature

BIAS

: 1.4V to 6.5V

: 3.0V to 6.5V

Load Transient Response

MIC49300

TIME (20µs/div.)

-V

BIAS

OUT

= 2.5V

= 1.8V

= 10µF Ceramic

= 5V

) of 500mV over

M9999-082605-B

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