MIC2285AYMT TR Micrel Inc, MIC2285AYMT TR Datasheet

High Efficient Single 500mA Buck Switcher In Small 2x2 Thin MLFr

MIC2285AYMT TR

Manufacturer Part Number

MIC2285AYMT TR

Description

High Efficient Single 500mA Buck Switcher In Small 2x2 Thin MLFr

Manufacturer

Micrel Inc

Type

Step-Down (Buck)r

Datasheet

1.MIC2285YML_TR.pdf (14 pages)

Specifications of MIC2285AYMT TR

Internal Switch(s)

Yes

Synchronous Rectifier

Yes

Number Of Outputs

Voltage - Output

Adj to 1V

Current - Output

500mA

Frequency - Switching

8MHz

Voltage - Input

2.7 ~ 5.5 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

10-TMLF®

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

576-2123-2
576-2123-2
576-2973-2

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General Description

The Micrel MIC2285 is a high efficiency 8MHz pulse

width modulated (PWM) synchronous buck (step-

down) regulator that features a LOWQ™ LDO standby

mode that draws only 18µA of quiescent current. The

MIC2285 allows an ultra-low noise, small size, and

high efficiency solution for portable power applications.

In PWM mode, the MIC2285 operates with a constant

frequency 8MHz PWM control.

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™

mode, the LDO maintains 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 MIC2285 operates from a 2.7V to 5.5V input

voltage and features internal power MOSFETs that can

supply up to 500mA output current in PWM mode. It

can operate with a maximum duty cycle of 100% for

use in low-dropout conditions.

The MIC2285 is available in the 10-pin 3mm x 3mm

MLF™ package with a junction operating range from

–40°C to +125°C.

Data sheets and support documentation can be found

on Micrel’s web site at: www.micrel.com.

____________________________________________________________________________________________________

Typical Application

Patent Pending

LOWQ is a trademark of Micrel, Inc

MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc

January 2006

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

Adjustable Output Buck Regulator with LOWQ™ Mode

Under light load

Features

• 2.7 to 5.5V supply/input voltage

• Light load LOWQ™ LDO mode

• 8MHz PWM mode

• Adjustable output voltage option down to 1V

• Ultra-fast transient response

• Uses a tiny 0.47µH inductor

• Enables sub 1mm profile solution

• Fully integrated MOSFET switches

• Micropower shutdown

• Thermal shutdown and current limit protection

• Pb-free 10-pin 3mm x 3mm MLF package

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

Applications

• Cellular phones

• PDAs

• USB peripherals

Regulator with LDO Standby Mode

8MHz PWM Synchronous Buck

20µA quiescent current

Low noise, 75µVrms

Output current to 500mA

>90% efficiency

100% maximum duty cycle

Fixed output voltage options available

MIC2285

100

OUTPUT CURRENT (mA)

1.8V

=3.2V

100

=4.2V

=3.6V

OUT

200

Efficiency

300

400

www.micrel.com

M9999-012406

500

Related parts for MIC2285AYMT TR

MIC2285AYMT TR Summary of contents

Page 1

General Description The Micrel MIC2285 is a high efficiency 8MHz pulse width modulated (PWM) synchronous buck (step- down) regulator that features a LOWQ™ LDO standby mode that draws only 18µA of quiescent current. The MIC2285 allows an ultra-low noise, small ...

Page 2

Ordering Information Part Number Voltage* MIC2285YML Note: * Other Voltage options available. Contact Micrel for details. Pin Configuration Pin Description Pin Number Pin Name 1 AGND 2 LDO 3 BIAS 4 AVIN _____ 7 LOWQ 8 ...

Page 3

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 ...

Page 4

Parameter Condition Output Voltage Noise LOWQ = 0V; C LDO Current Limit LOWQ = 0V; V Over-Temperature Shutdown Over-Temperature Hysteresis Notes 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside ...

Page 5

Typical Characteristics – PWM Mode 2.5V Efficiency OUT 100 90 V =3. =3. =4. 100 200 300 400 500 OUTPUT CURRENT (mA) 1.2V Efficiency OUT ...

Page 6

Typical Characteristics - LDO Mode Dropout Voltage vs. Temperature 3.3V OUT I = 25mA 10 OUT LowQ = 0V 0 -40 - 100 120 TEMPERATURE (°C) ...

Page 7

Typical Characteristics – LDO Mode (cont.) Quiescent Current vs. Output Current 3. LowQ = 100 OUTPUT CURRENT (mA) January 2006 ...

Page 8

Functional Diagram January 2006 MIC2285 Block Diagram 8 M9999-012406 www.micrel.com ...

Page 9

Functional Characteristics Load Transient PWM Mode 10mA Time (20µs/div) Enable Transient PWM Mode 0V 0V Time (40µs/div) January 2006 10mA C = 4.7µF OUT 4.7µF OUT 9 Load Transient LDO Mode C = 4.7µF OUT Time ...

Page 10

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 close to VIN and the power ground (PGND) ...

Page 11

Applications Information The MIC2285 is a 500mA 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 down all ...

Page 12

Layout Recommendation January 2006 Component Placement Evaluation Board Layout TOP BOTTOM 12 M9999-012406 www.micrel.com ...

Page 13

Typical Application Circuit with Bill of Materials (BOM) Item Part Number 0603D105MAT2A C1 GRM185R60J105KE21D C1608X5R1A105K C1608X5R0J106K C4 06036D106MAT2A GRM188R60J106M C1005X5R0J104M C2 04026D104MAT2A GRM155R60J104K VJ0402A820KXQCW1BC C3 C1005COG1H820J DO2010-501ML L1 LQM21PNR47M00 (7) R1 CRCW04021003F CRCW04026652F CRCW04021243F (7) R2 CRCW04022003F CRCW04024993F R3 CRCW040220R5F ...

Page 14

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. However, no ...

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