mic3385yhl Micrel Semiconductor, mic3385yhl Datasheet

mic3385yhl

Manufacturer Part Number

mic3385yhl

Description

Mic3385 8mhz Power System Module With Ldo Standby Mode

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC3385YHL.pdf (14 pages)

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Quantity

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Company:

Meier Automation Equipment Co., Limited

Part Number:

MIC3385YHL

Manufacturer:

MICREL/麦瑞

Quantity:

20 000

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General Description

The Micrel MIC3385 is a high efficiency inductorless buck

regulator that features a LOWQ

draws only 18µA of quiescent current. The MIC3385

requires no external inductor enabling an ultra-low noise,

small size, and high efficiency solution for portable power

applications.

In PWM mode, the MIC3385 operates with a constant

frequency 8MHz PWM control. Under light load conditions,

such as in system sleep or standby modes, the PWM

switching operation can be disabled to reduce switching

losses. In this light load LOWQ

the output voltage and draws only 18µA of quiescent

current. The LDO mode of operation saves battery life

while not introducing spurious noise and high ripple as

experienced with pulse skipping or bursting mode

regulators.

The MIC3385 operates from 2.7V to 5.5V input and

features internal power MOSFETs that can supply up to

600mA output current in PWM mode. It can operate with a

maximum duty cycle of 100% for use in low-dropout

conditions.

The MIC3385 is available in the 14-pin 3mm x 3.5mm

MLF

to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Typical Application

LOWQ is a registered trademark of Micrel, Inc.

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

February 2008

package with a junction operating range from –40°C

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

Adjustable Output Buck Regulator with LOWQ

mode, the LDO maintains

LDO standby mode that

Mode

Features

• 2.7 to 5.5V supply voltage

• Light load LOWQ

• 8MHz PWM mode

• Adjustable output voltage option down to 1V

• Ultra-fast transient response

• NO external inductor required

• Enables sub 1mm profile solution

• Fully integrated MOSFET switches

• Micropower shutdown

• Thermal shutdown and current limit protection

• Pb-free 14-pin 3x3.5x0.9mm MLF

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

Applications

• Slim digital cameras

• MP3 players

• Portable power applications

• Cellular phones

• PDAs

• USB peripherals

408

) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

–

8MHz Inductorless Buck Regulator

18µA quiescent current

Low noise, 75µVrms

Output current to 600mA

>90% efficiency

100% maximum duty cycle

with LDO Standby Mode

MIC3385

100

LDO mode

100 200 300 400 500 600

2.5V

OUTPUT CURRENT (mA)

=4.2V

=3.6V

OUT

=3.2V

Efficiency

package

M9999-021908-B

Related parts for mic3385yhl

mic3385yhl Summary of contents

Page 1

General Description The Micrel MIC3385 is a high efficiency inductorless buck ® regulator that features a LOWQ draws only 18µA of quiescent current. The MIC3385 requires no external inductor enabling an ultra-low noise, small size, and high efficiency solution for ...

Page 2

... Micrel, Inc. Ordering Information Part Number MIC3385YHL MIC3385-1.5YHL Notes: MLF® GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Other voltage options available. Please contact Micrel for details. Pin Configuration Pin Description Pin Number Pin Name ...

Page 3

Micrel, Inc. Absolute Maximum Ratings Supply Voltage (V ) .......................................................+6V IN Output Switch Voltage (V ). .........................................+6V SW Output Switch Current (I )..............................................2A SW Logic Input Voltage ( )....................... –0. LOWQ Storage Temperature (T ) ...

Page 4

Micrel, Inc. Parameter Condition Output Voltage Noise LOWQ = 0V; C LDO Current Limit LOWQ = 0V; V Over-Temperature Shutdown Over-Temperature Hysteresis Internal Inductor Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not ...

Page 5

Micrel, Inc. Typical Characteristics ― PWM Mode 2.5V Efficiency OUT 100 90 V =3. =3. =4. 100 200 300 400 500 600 OUTPUT CURRENT (mA) ...

Page 6

Micrel, Inc. Typical Characteristics ― LDO Mode February 2008 6 MIC3385 M9999-021908-B ...

Page 7

Micrel, Inc. Typical Characteristics ― LDO Mode (cont.) February 2008 7 MIC3385 M9999-021908-B ...

Page 8

Micrel, Inc. Functional Characteristics Load Transient PWM Mode Time (100µs/div) Enable Transient PWM Mode Time (40µs/div) February 2008 C = 10µF OUT C = 10µF OUT 8 Load Transient LDO Mode C = 10µF OUT Time (100µs/div) Enable Transient LDO ...

Page 9

Micrel, Inc. Functional Diagram February 2008 MIC3385 Block Diagram 9 MIC3385 M9999-021908-B ...

Page 10

Micrel, Inc. Functional Description VIN VIN provides power to the MOSFETs for the switch mode regulator section, along with the current limiting sensing. Due to the high switching speeds, a 1µF capacitor is recommended to ground (GND) pin for bypassing. ...

Page 11

Micrel, Inc. Application Information The MIC3385 is a 600mA PWM power supply that utilizes a LOWQ light load mode to maximize battery efficiency in light load conditions. This is achieved with a LOWQ control pin that when pulled low, shuts ...

Page 12

Micrel, Inc. Layout Recommendations Note: The above figures demonstrate the recommended layout for the MIC3385 adjustable option. February 2008 Top Layer Bottom Layer 12 MIC3385 M9999-021908-B ...

Page 13

... CRCW04021003FKEYE3 R2 CRCW04021243FKEYE3 R3 CRCW060320R0FKEYE3 R4, R5 CRCW06031002FKEYE3 U1 MIC3385YHL Notes: 1. TDK: www.tdk.com 2. Taiyo Yuden, Inc.: www.t-yuden.com 3. Murata: www.murata.com 4. AVX: www.avxcorp.com 5. Vishay: www.website.com 6. Micrel, Inc.: www.micrel.com February 2008 U1 Vin MIC3385YHL 2 VIN C1 12 AVin 10µF/6. LOWQ R3 Vin 14 BIAS C2 0.1µF/6.3V MIC3385 Adjustable Output Schematic Manufacturer ...

Page 14

Micrel, Inc. Package Information 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. ...

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