Microchip MIC2299 Manual

Microchip Ikke kategoriseret MIC2299

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Side 1/14

MIC2299

3.5A Minimum, 2MHz High Brightness

LED Driver

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

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

408

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

October 2007

M9999-101907-B

General Description

The MIC2299 is a high power boost-switching regulator

that is optimized for constant-current control. The MIC2299

is capable of driving up to 2 series 1A white LED for

photoflash and other applications. The feedback voltage is

only 200mV, minimizing power dissipation in constant-

current control applications, and hence extends battery

life.

The MIC2299 has a brightness pin that allows for a

programmable torch mode as well as full flash with a

single pin when driving high current LEDs.

The MIC2299 implements a constant frequency 2MHz

PWM control scheme to make the smallest possible

design. The MIC2299’s 2MHz operation avoids signal

interference in the AM band.

The 2.5V to 10V input voltage range of MIC2299 allows

direct operation from 1- and 2-cell Li-Ion as well as 3- to 4-

cell NiCad/ NiMH/ Alkaline or lithium batteries. Maximum

battery life is assured with a low 1uA shutdown current.

The MIC2299 is available in a low profile 12-pin 3mm x

3mm MLF

package.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• Programmable current control

• 200mV ±10% feedback voltage

• 2.5V to 10V input voltage

• Output over-voltage protection (OVP)

• Output voltage up to 30V (max)

• Fixed 2MHz Operation

• Guaranteed 3.5A switch current over-temperature

• Solution size of just 0.25in

(1.6cm

)

• Output power range of 7W to 12W

• <1% line regulation

• 1µA shutdown current

• Over temperature protection

• Externally programmable soft-start

• Under-voltage lockout (UVLO)

• 12-pin 3mm x 3mm leadless MLF

package

• –40

C to +125

C junction temperature range

Applications

• Cell phones

• PDAs

• Digital cameras

• White LED flashlights

___________________________________________________________________________________________________________

Typical Application

Figure 1. High Power White LED Driver

Micrel, Inc. MIC2299

October 2007

2 M9999-101907-B

Ordering Information

Part Number OVP Frequency Junction Temp. Range Package Lead Finish

MIC2299-15YML 15V 2MHz –40° to +125°C 12-Pin 3x3 MLF

Pb-Free

Note

MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

Pin Configuration

PGND SW

1BRT

SS/DIM

AGND

12 COMP

VIN

OVP

6 7

12-Pin 3mm x 3mm MLF (ML)

(Top View)

Pin Description

Pin Number Pin Name Pin Function

1 BRT BRT (Input): Short this pin to GND to achieve 20% I

OUT

(1V gives I

OUT

at 100%).

As an alternative connect a resistor to GND to control the I

OUT

to >0.2I

OUT

. . A

10µA current source sets the voltage on the resistor. Hence a 50K resistor

would yield 0.5V which would be 50% of I

OUT

nominal.

2 SS/DIM Soft start/dimming (input) 40kΩ source from V

. Connect a capacitor to GND

for soft-start. Clamp the pin to a known voltage to control the internal reference

voltage and hence the output current. This can also be done with a resistor to

GND

3 FB Feedback (Input): Output voltage sense node. Connect the cathode of the LED

to this pin.

4 AGND Analog Ground

5,6 PGND Power Ground

7,8 SW Switch Node (Input): Internal power BIPOLAR collector.

9 OVP Over-Voltage Protection (OVP): Connect to the output voltage to clamp the

maximum output voltage. A resistor divider from this pin to ground could be

used to raise the OVP level beyond 15V (max).

10 VIN Supply (Input): 2.5V to 10V for internal circuitry.

11 EN Enable (Input): Logic High enables regulator. Logic Low shuts down regulator.

12 COMP Compensation pin (Input): Add external R and C to GND to stabilize the

converter.

Pad EP Ground (Return): Backside exposed pad.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MIC2299

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