MIC49500WU Micrel Inc, MIC49500WU Datasheet

5A LDO, Low Vin, Low Vout, Fast Transient Response, Cap Stable ( )

MIC49500WU

Manufacturer Part Number

MIC49500WU

Description

5A LDO, Low Vin, Low Vout, Fast Transient Response, Cap Stable ( )

Manufacturer

Micrel Inc

Datasheet

1.MIC49500WR_TR.pdf (11 pages)

Specifications of MIC49500WU

Regulator Topology

Positive Adjustable

Voltage - Output

0.7 ~ 6 V

Voltage - Input

1.4 ~ 6 V

Voltage - Dropout (typical)

0.29V @ 5A

Number Of Regulators

Current - Output

Current - Limit (min)

5.5A

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

TO-263-7, DÂ²Pak (7 leads + Tab), TO-263CA

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

576-2350
MIC49500WU

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General Description

The MIC49500 is an ultra-high-bandwidth, low-

dropout, 5.0A voltage regulator ideal for powering

core voltages of low-voltage microprocessors. The

MIC49500 implements a dual supply configuration

allowing for very low output impedance and very fast

transient response.

The MIC49500 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 6V and the bias supply requires between

3V and 6V for proper operation. The MIC49500 can

regulate to an output voltage as low as 0.7V, making it

an ideal product for low-voltage to low-voltage

conversion.

The MIC49500 requires a minimum of output

capacitance for stability, working optimally with any

type of capacitor, including small ceramic capacitors.

Available in fixed output voltages from 0.9V to 1.8V

and adjustable output voltages down to 0.7V, the

MIC49500 comes in both 7-pin S-Pak and TO-263

packages. The MIC49500 is rated to the full operating

temperature range of –40°C to 125°C junction

temperature.

Typical Application

July 2007

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

OFF

= 3.1V

Ceramic

BIAS

Ceramic

= 2.0V

= 1µF

Fast Transient Response Regulator

Low Voltage,

BIAS

MIC49500WR

GND

OUT

ADJ

OUT

Ceramic

= 1.0V

OUT

= 10µF

Features

• Input voltage range:

• Stable with 10µF ceramic output capacitor

• +1.0% initial output tolerance

• Maximum dropout (V

• Adjustable output voltage down to 0.7V

• Ultra Fast Transient Response (Up to 10MHz

• Excellent line and load regulation specifications

• Logic controlled shutdown option

• Thermal shutdown and current limit protection

• Thin 7-pin S-Pak package

• TO-263 7-pin package

• –40°C to +125°C operating junction temperature

Applications

• ASIC Core Voltage Regulator

• PLD/FPGA Core Power Supply

• Linear Point-of-Load Conversion

• High Speed Post-Regulator

–

temperature

bandwidth)

range

5A Dual Supply, Low Voltage,

BIAS

: 1.4V to 6V

High Bandwidth LDO

: 3.0V to 6V

MIC49500

Load Transient

Time (10µs/div)

– V

OUT

) is 500mV over

OUT

BIAS

OUT

= 2.8V

= 1.8V

= C

= 3.9V

BIAS

= 10µF

M9999-071307

Related parts for MIC49500WU

MIC49500WU Summary of contents

Page 1

... IN Ceramic Low Voltage, Fast Transient Response Regulator Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com July 2007 Features • Input voltage range: – – ...

Page 2

Block Diagram EN Enable July 2007 Ilimit Bandgap ADJ FIX 2 VBIAS VIN ADJ SNS / ADJ FIX (SNS) VOUT GND M9999-071307 ...

Page 3

... Connect direct to pin 5 if not used. ADJ Adjust Input. Connect external resistor divider to program output voltage. 3 Package Lead Finish* S-Pak-7 RoHS Compliant S-Pak-7 RoHS Compliant S-Pak-7 RoHS Compliant TO-263 RoHS Compliant TO-263 RoHS Compliant TO-263 RoHS Compliant 7 VSNS/ADJ VOUT 4 GND 3 VIN 2 VBIAS 1 EN MIC49500WU (TO263-7) M9999-071307 ...

Page 4

Absolute Maximum Ratings Supply Voltage (V ) ............................................. 6.5V IN Bias Supply Voltage (V ) .................................. 6.5V BIAS Enable Input Voltage (V )................................... 6.5V EN Power Dissipation............................. Internally Limited Junction Temperature ................. -40°C ≤ T Storage Temperature (TS) ........... -65°C ...

Page 5

Typical Characteristics Ground Current vs. Load Current OUT V = 1.2V 30 OUT 3.3V 25 BIAS C = 10µF OUT 20 ...

Page 6

Typical Characteristics (continued) Output Noise Spectral Density 2.8V OUT C = 10µF OUT I = 10mA OUT 0.01 0.01 0 100 1,000 10,000 FREQUENCY (kHz) July 2007 MIC49500 VBIAS ...

Page 7

Functional Characteristics Enable Turn-On Time (2µs/div) Line Transient (V 4V Time (100µs/div) July 2007 V = 1.8V OUT BIAS I = 10mA OUT 10µF OUT BIAS C = 47pF FEEDFORWARD ...

Page 8

Applications Information The MIC49500 is an ultra-high performance, low dropout linear regulator designed for high current applications requiring fast transient response. The MIC49500 utilizes two input supplies, significantly reducing dropout voltage, perfect for low-voltage, DC- to-DC conversion. The MIC49500 requires ...

Page 9

The low dropout properties of the MIC49500 allow significant reductions dissipation and the associated heat sink without compromising performance. When this technique is employed, a capacitor of at least 1µF is needed directly between the input and regulator ground. ...

Page 10

Package Information July 2007 7-Pin SPAK (R) 7-Pin TO-263 (U) 10 M9999-071307 ...

Page 11

MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is ...

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