MIC2843YMT TR Micrel Inc, MIC2843YMT TR Datasheet

Six Channel Current Sink In 2x2 Thin MLFr

MIC2843YMT TR

Manufacturer Part Number

MIC2843YMT TR

Description

Six Channel Current Sink In 2x2 Thin MLFr

Manufacturer

Micrel Inc

Type

PWM Controlr

Datasheet

1.MIC2843YMT_TR.pdf (15 pages)

Specifications of MIC2843YMT TR

Constant Current

Yes

Topology

Linear (LDO), PWM

Number Of Outputs

Internal Driver

Yes

Type - Primary

Backlight, Flash/Torch

Type - Secondary

White LED

Frequency

500kHz

Voltage - Supply

3 V ~ 5.5 V

Mounting Type

Surface Mount

Package / Case

10-TMLF®

Operating Temperature

-40°C ~ 125°C

Current - Output / Channel

20mA

Internal Switch(s)

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Output

Efficiency

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

576-3507-2

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General Description

The MIC2843 is a high-efficiency linear white LED (WLED)

driver designed to drive up to six WLEDs, greatly

extending battery life for portable display backlighting,

keypad backlighting, and camera flash in mobile devices.

The MIC2843 provides the highest possible efficiency as

this architecture has no switching losses present in

traditional charge pumps or inductive boost circuits. The

MIC2843 provides six linear drivers which maintain

constant current for up to six WLEDs. It features a typical

dropout of less than 40mV at 20mA. This allows the

WLEDs to be driven directly from the battery eliminating

switching noise/losses present with the use of boost

circuitry.

The six channels are matched better than ±3% typical,

ensuring uniform display illumination under all conditions.

The brightness is controlled through an Ultra Fast PWM™

interface operating down to less than 1% duty cycle.

The MIC2843 is available in the 2mm x 2mm 10-pin Thin

MLF

of −40°C to +125°C.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

____________________________________________________________________________________________________________

Typical Application

Ultra Fast PWM is a trademark of Micrel, Inc.

MLF and MicroLeadFrame are registered trademark Amkor Technology Inc.

November 2010

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

leadless package with a junction temperature range

LCD Display Backlight with Six WLEDs

Features

• High efficiency (no voltage boost losses)

• Ultra Fast PWM™ control (200Hz to 500kHz)

• Input voltage range: 3.0V to 5.5V

• Dropout of less than 40mV at 20mA

• Matching better than ±3% (typical)

• Current accuracy better than ±1.5% (typical)

• Maintains proper regulation regardless of how many

• Available in a 2mm x 2mm 10-pin Thin MLF

Applications

• Mobile handsets

• Digital cameras

• Portable media/MP3 players

• Portable navigation devices (GPS)

• Portable applications

408

channels are utilized

) 944-0800 • fax + 1 (408) 474-1000 •

High-Efficiency 6-Channel

Ultra-Fast PWM™ Control

Linear WLED Driver with

High Current Flash Driver

MIC2843

http://www.micrel.com

M9999-110810-B

package

Related parts for MIC2843YMT TR

MIC2843YMT TR Summary of contents

Page 1

... LCD Display Backlight with Six WLEDs Ultra Fast PWM is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademark Amkor Technology Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( November 2010 MIC2843 High-Efficiency 6-Channel Linear WLED Driver with Ultra-Fast PWM™ ...

Page 2

... Micrel Inc. Ordering Information Part Number Mark Code MIC2843YMT YS3 Note: ® 1. Thin MLF ▲ = Pin 1 identifier. ® 2. Thin MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is halogen free. Pin Configuration Pin Description Pin Number Pin Name Pin Function ...

Page 3

... Micrel Inc. Absolute Maximum Ratings ) .................................. −0.3V to +6V Main Input Voltage ( ............................ −0.3V to +6V Enable Input Voltage (V END ) ..................... −0.3V to +6V Current Source Voltage (V D1-D6 Power Dissipation .....................................Internally Limited Lead Temperature (soldering, 10sec.)....................... 260°C Storage Temperature (T ) .........................−65°C to +150°C s (3) ESD Rating ...

Page 4

... Micrel Inc. Typical Characteristics November 2010 4 MIC2843 M9999-110810-B ...

Page 5

... Micrel Inc. Typical Characteristics (Continued) November 2010 5 MIC2843 M9999-110810-B ...

Page 6

... Micrel Inc. Functional Characteristics November 2010 6 MIC2843 M9999-110810-B ...

Page 7

... Micrel Inc. Functional Characteristics November 2010 7 MIC2843 M9999-110810-B ...

Page 8

... Micrel Inc. Functional Diagram November 2010 Figure 1. MIC2843 Functional Block Diagram 8 MIC2843 M9999-110810-B ...

Page 9

... Micrel Inc. Functional Description The MIC2843 is a six-channel WLED driver. The WLED driver is designed to maintain proper current regulation with LED current accuracy of 1.5% while the typical matching between the six channels room temperature. The WLEDs are driven independently from the input supply and will maintain regulation with a dropout of 40mV at 20mA ...

Page 10

... Micrel Inc. Application Information Ultra Fast PWM™ Dimming Interface The MIC2843 can receive PWM signals from the END pin for WLED dimming. Dimming is generated by pulsing the WLEDs on and off in synchronization with the PWM signal. The MIC2843 supports PWM frequencies from 200Hz to 500kHz. For PWM frequencies between 200Hz – ...

Page 11

... Micrel Inc. Figure 6. PWM Signal at 1% Duty Cycle (Iavg = 0.2mA) Figure 8. PWM Signal at 50% Duty Cycle (I Figure 10. PWM Signal at 100% Duty Cycle (I November 2010 Figure 7. PWM Signal at 20% Duty Cycle (Iavg = 4mA) = 10mA) Figure 9. PWM Signal at 80% Duty Cycle (I avg = 20mA) ...

Page 12

... Micrel Inc. High-Current Parallel Operation The linear drivers are independent of each other, and can be used individually or paralleled for larger current. A single WLED can be driven with all six linear drivers by connecting D1 through D6 together with the cathode of the WLED as shown in Figure 11. This will generate a ...

Page 13

... Micrel Inc. MIC2843 Typical Application Circuit Bill of Materials Item Part Number C1 C1608X5R0J105K R1 CRCW06032052FT1 U1 MIC2843YMT Notes: 1. TDK: www.tdk.com. 2. Vishay: www.vishay.com. 3. Micrel, Inc.: www.micrel.com. November 2010 Manufacturer Description (1) TDK 1µF Ceramic Capacitor, 6.3V, X5R, Size 0603 (2) Vishay 20.5kΩ, 1%, Size 0603 High-Efficiency Six-Channel Linear WLED Driver with (3) Micrel, Inc ...

Page 14

... Micrel Inc. PCB Layout Recommendations November 2010 Top Layer Bottom Layer 14 MIC2843 M9999-110810-B ...

Page 15

... 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 Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’ ...

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