MIC2205-1.58YML TR Micrel Inc, MIC2205-1.58YML TR Datasheet

2MHz Synchronous Buck Regulator - Low Q Mode ( )

MIC2205-1.58YML TR

Manufacturer Part Number

MIC2205-1.58YML TR

Description

2MHz Synchronous Buck Regulator - Low Q Mode ( )

Manufacturer

Micrel Inc

Type

Step-Down (Buck)r

Datasheet

1.MIC2205YML_TR.pdf (16 pages)

Specifications of MIC2205-1.58YML TR

Internal Switch(s)

Yes

Synchronous Rectifier

Yes

Number Of Outputs

Voltage - Output

1.58V

Current - Output

600mA

Frequency - Switching

2MHz

Voltage - Input

2.7 ~ 5.5 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

10-MLF®, QFN

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

576-1722-2
MIC2205-1.58YMLTR
MIC2205-1.58YMLTR

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General Description

The Micrel MIC2205 is a high efficiency 2MHz PWM

synchronous

features a LOWQ™ LDO standby mode that draws

only 18µA of quiescent current.

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

efficiency solution for portable power applications.

In PWM mode, the MIC2205 operates with a

constant frequency 2MHz 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.

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 MIC2205 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 MIC2205 is available in the 3mm x 3mm MLF-

10L 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

LOWQ is a trademark of Micrel, Inc

March 2005

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

2.7V to 5.5V

Adjustable Output Buck Regulator with LOWQ™ Mode

GND

1µF

buck

0.1µF

LowQ

(step-down)

VIN

AVIN

LOWQ

BIAS

PGND

MIC2205

AGND

LDO

regulator

The MIC2205

In this light

100k

125k

2.2µH

that

100pF

2.2µF

GND

OUT

Features

• 2.7 to 5.5V supply voltage

• Light load LOWQ™ LDO mode

• 2MHz PWM mode

• Adjustable output voltage option down to 1V

• Ultra-fast transient response

• Stable with 1µF ceramic output capacitor

• Fully integrated MOSFET switches

• Micropower shutdown

• Thermal shutdown and current limit protection

• Pb-free 3mm x 3mm MLF-10L package

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

Applications

• Cellular phones

• PDAs

• USB peripherals

Regulator with LDO Standby Mode

2MHz PWM Synchronous Buck

18µA quiescent current

Low noise, 75µVrms

Output current to 600mA

>95% efficiency

100% maximum duty cycle

Fixed output voltage options available

MIC2205

www.micrel.com

M9999-031105

Related parts for MIC2205-1.58YML TR

MIC2205-1.58YML TR Summary of contents

Page 1

... PWM mode. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions. The MIC2205 is available in the 3mm x 3mm MLF- 10L package with a junction operating range from –40°C to +125°C. Data sheets and support documentation can be found on Micrel’ ...

Page 2

... Ordering Information Part Number MIC2205YML MIC2205-1.58YML Note: 1. 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 VIN PGND EP GND March 2005 Output Junction Temp. Range (1) Voltage Adj. –40° to +125°C 1.58V – ...

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 March 2005 5 M9999-031105 www.micrel.com ...

Page 6

Typical Characteristics – PWM Mode (cont.) March 2005 6 M9999-031105 www.micrel.com ...

Page 7

Typical Characteristics - LDO Mode March 2005 7 M9999-031105 www.micrel.com ...

Page 8

Typical Characteristics – LDO Mode (cont.) March 2005 8 M9999-031105 www.micrel.com ...

Page 9

... Functional Diagram March 2005 MIC2205 Block Diagram 9 M9999-031105 www.micrel.com ...

Page 10

Functional Characteristics Load Transient PWM Mode Time 20 s/div Enable Transient PWM Mode Time 40 s/div March 2005 LowQ = V IN LowQ = 0V 10 M9999-031105 www.micrel.com ...

Page 11

Functional Characteristics March 2005 11 M9999-031105 www.micrel.com ...

Page 12

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 13

... ESR and ESL. Inductor Selection The MIC2205 is designed for use with a 2.2µH inductor. Proper selection should ensure the inductor can handle the maximum average and peak currents required by the load. Maximum current ratings of the inductor are generally given in two methods ...

Page 14

... Layout Recommendations Note: The above figures demonstrate the recommended layout for the MIC2205 adjustable option. March 2005 Top Bottom 14 M9999-031105 www.micrel.com ...

Page 15

... Micrel, Inc. Tel: 408-944-0800 March 2005 MIC2205 VIN AVIN LDO 1µ LOWQ FB LowQ 3 BIAS C2 0.1µF PGND AGND 10 1 Adjustable Output MIC2205 VIN AVIN LDO 1µ LOWQ LowQ 3 BIAS C2 0.1µF PGND AGND 10 1 Fixed Output Description 1µF Ceramic Capacitor X5R, 6.3V 0603 1µ ...

Page 16

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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