mic2291yd5 Micrel Semiconductor, mic2291yd5 Datasheet

mic2291yd5

Manufacturer Part Number

mic2291yd5

Description

Mic2291 1.2a Pwm Boost Regulator Photo Flash Led Driver

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2291YD5.pdf (10 pages)

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General Description

The MIC2291 is a 1.2MHz Pulse Width Modulation (PWM),

boost-switching regulator that is optimized for high-current,

white LED photo ﬂash applications. With a guaranteed

switch current of 1.2A, the MIC2291 easily drives a string

of 3 white LEDs in series at 100mA, ensuring a high level

of brightness and eliminating several ballast resistors.

The MIC2291 implements a constant frequency, 1.2MHz

PWM control scheme. The high frequency PWM operation

saves board space by reducing external component sizes.

The added beneﬁt of the constant frequency PWM

scheme, in contrast to variable frequency topologies, is

much lower noise and input ripple injected back to the

battery source.

To optimize efficiency, the feedback voltage is set to only

95mV. This reduces the power dissipation in the current

set resistor, and allows the lowest total output voltage,

hence minimal current draw from the battery.

The MIC2291 is available with 2 levels of over-voltage

protection, 15V, and 34V. This allows designers to choose

the smallest possible external components with the

appropriate voltage ratings for their applications.

The MIC2291 is available in low-proﬁle, Thin SOT23 5-pin

and 8-pin 2mm × 2mm MLF

MIC2291 has a junction temperature range of –40°C to

+125°C.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Typical Application

PowerPAK is a trademark of Siliconix, Inc.

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

May 2007

3V to 4.2V

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

1-Cell

Li Ion

Thin SOT23 Flash LED Driver

1µF

MIC2291xD5

VIN

10µH

GND

package options. The

95mV

100mA

0.22µF

ceramic

Features

• 2.5V to 10V input voltage

• Output voltage up to 34V

• 1.2A switch current

• 1.2MHz PWM operation

• 95mV feedback voltage

• Overvoltage protection (OVP)

• Stable with ceramic capacitors

• <1% line and load regulation

• 1µA shutdown current

• Over temperature protection

• UVLO

• Low-proﬁle Thin SOT23-5 package option

• 2mm × 2mm MLF

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

Applications

• Photo Flash LED driver

• Cell phones

• PDAs

• GPS systems

• Digital cameras

• IP phones

• LED ﬂashlights

408

1.2A PWM Boost Regulator Photo Flash

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

–

2mm x 2mm Flash LED Driver with Output OVP

3V to 4.2V

Options for 15V and 34V

1-Cell

Li Ion

1µF

MIC2291

LED Driver

package option

MIC2291-15xML

VIN

10µH

GND

OVP

95mV

100mA

M9999-051507

0.22µF

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mic2291yd5 Summary of contents

Page 1

General Description The MIC2291 is a 1.2MHz Pulse Width Modulation (PWM), boost-switching regulator that is optimized for high-current, white LED photo ﬂash applications. With a guaranteed switch current of 1.2A, the MIC2291 easily drives a string of 3 white LEDs ...

Page 2

... Micrel, Inc. Ordering Information Part Number Marking* MIC2291BD5 SSAA MIC2291YD5 SSAA MIC2291-15BML STA MIC2291-15YML STA** MIC2291-34BML STC MIC2291-34YML STC** Notes: * Under bar / Over bar symbol may not be to scale. ** Over bar symbol located after Pin 1 identifier. Pin Configuration FB GND ...

Page 3

Micrel, Inc. Absolute Maximum Ratings Supply Voltage (V ) .......................................................12V IN Switch Voltage (V )....................................... –0.3V to 34V SW Enable Pin Voltage (V )................................... –0. Voltage (V )...............................................................6V FB Switch Current (I ) .........................................................2A SW Storage ...

Page 4

Micrel, Inc. Typical Characteristics May 2007 4 MIC2291 M9999-051507 ...

Page 5

Micrel, Inc. Functional Characteristics May 2007 5 MIC2291 M9999-051507 ...

Page 6

Micrel, Inc. Functional Diagram VIN V REF * OVP available on MLF Functional Description The MIC2291 is a constant frequency, PWM current mode boost regulator. The block diagram is shown above. The MIC2291 is composed of an oscillator, slope compensation ...

Page 7

Micrel, Inc. Application Information PWM Boost Conversion The MIC2291 is a constant frequency boost converter. It operates by taking a DC input voltage and regulating cur-rent through series LED’s by monitoring voltage across the sense resistor (R2). ...

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mic2291yd5 Micrel Semiconductor, mic2291yd5 Datasheet

mic2291yd5

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mic2291yd5 Summary of contents

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