MIC2860-2DYC6 TR Micrel Inc, MIC2860-2DYC6 TR Datasheet

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MIC2860-2DYC6 TR

Manufacturer Part Number
MIC2860-2DYC6 TR
Description
IC WHITE LED DVR 2CH SC-70-6
Manufacturer
Micrel Inc
Series
-r
Datasheet

Specifications of MIC2860-2DYC6 TR

Constant Current
-
Constant Voltage
-
Topology
Linear (LDO)
Number Of Outputs
2
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Frequency
-
Voltage - Supply
3 V ~ 5.5 V
Voltage - Output
0 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
6-TSSOP, SC-88, SOT-363
Operating Temperature
-40°C ~ 85°C
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
576-3896-2
General Description
The MIC2860-2D is a high efficiency White LED (WLED)
driver designed to drive two WLEDs and greatly extend
battery life for portable display backlighting, and keypad
backlighting in low cost mobile devices. The MIC2860-2D
architecture provides the highest possible efficiency by
eliminating switching losses present in traditional charge
pumps or inductive boost circuits. It features a typical
dropout of 52mV at 30.2mA per channel. This allows the
WLEDs to be driven directly from the battery eliminating
switching noise and losses present with the use of boost
circuitry.
The two channels have better than ±0.5% matching, which
ensures uniform display illumination under all conditions.
The WLEDs brightness is externally preset by a resistor
and dimmed using a single wire digital control signal. The
MIC2860-2D single wire digital interface accepts digital
programming pulses providing 32 dimming steps.
The MIC2860-2D is available in Thin SOT-23 and SC-70
six pin packages with a junction temperature range of
-40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
____________________________________________________________________________________________________________
Typical Application
July 2010
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
LCD Display Backlight with 2 WLEDs
Features
• High Efficiency (no switching losses)
• No charge pumps
• 2 WLED driver channels
• Single wire digital control
• Input voltage range: 3.0V to 5.5V
• WLED driver dropout of 52mV at 30.2mA
• Matching better than ±0.5% (typical)
• Current Accuracy better than ±1.0% (typical)
• Available in Thin SOT-23 and SC-70 6 pin packages
Applications
• Mobile handsets
• Digital cameras
• Portable media/MP3 players
• Portable navigation devices (GPS)
• Portable applications
408
High Efficiency 2 Channel WLED Driver
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
with Single Wire Digital Control
MIC2860-D
M9999-072010-A

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MIC2860-2DYC6 TR Summary of contents

Page 1

... The MIC2860-2D single wire digital interface accepts digital programming pulses providing 32 dimming steps. The MIC2860-2D is available in Thin SOT-23 and SC-70 six pin packages with a junction temperature range of -40°C to +125°C. Datasheets and support documentation can be found on Micrel’ ...

Page 2

... Connect an external resistor from this pin to GND to set the maximum LED current. Example, apply a 9.53kΩ resistor between RSET and GND to set LED current to 30mA at 100% duty cycle. LED1 driver. Connect LED anode to VIN and cathode to this pin. Do not leave floating. 2 MIC2860-2D (2) Package 6-Pin SC-70 6-Pin Thin SOT-23 ...

Page 3

... IN ) .................................... .................................. D1 ........................ –40°C to +125°C J SC-70 (θ ).....................................................256 ° SOT-23 (θ ) ..................................................177 ° Min Typ 27.18 30.2 ±0.5 52 0.7 0.01 1.4 0.01 100 0.3 33 MIC2860- ≤ 85°C; unless J Max Units 33. ±3 125 mV 1 µA 0 µA 500 µs 75 µs µs ...

Page 4

... BRIGHTNESS LEVEL R = 9.53kΩ SET BL-21 BL- 100 120 LED Current vs. Temperature 11.0 10.9 10.8 10.7 LED1-BL21 10.6 10.5 10.4 10.3 10.2 10 9.53kΩ SET 10.0 -40 - 100 120 TEMPERATURE (°C) MIC2860-2D LED2 R = 9.53kΩ SET LED2-BL11 LED1-BL11 R = 9.53kΩ SET 100 120 M9999-072010-A ...

Page 5

... Micrel Inc. Functional Characteristics July 2010 5 MIC2860-2D M9999-072010-A ...

Page 6

... The maximum WLED current for each channel is set via an external resistor. Block Diagram As shown in Figure 1, the MIC2860-2D consists of 2 current mirrors set to copy a master current determined The linear drivers have a designated control SET block for enabling and dimming of the WLEDs ...

Page 7

... The ground pin is the ground path for the linear drivers. The current loop for the ground should be as small as possible. The ground of the input capacitor should be routed with low impedance traces to the GND pin and made as short as possible. Refer to the layout dropout performance. recommendations for more details. 7 MIC2860-2D M9999-072010-A ...

Page 8

... Start Up 12.2 80.8 11.7 77.5 Assuming the MIC2860-2D has been off for a long time, 11.2 74.2 the MIC2860-2D will start-up in its default mode 10.7 70.9 approximately 33µs (t 10.2 67.9 applied to the SC pin. In the default mode the WLEDs 9 ...

Page 9

... To maintain operation at the current brightness level simply maintain a logic level high at the SC pin. Figure 6. Consecutive Brightness Level Commands The MIC2860-2D can be programmed to set WLED drive current to produce one of 32 distinct brightness levels. The following section explains how the brightness counter functions with continued programming edges. ...

Page 10

... Micrel Inc. MIC2860-2D Typical Application Circuit Bill of Materials Item Part Number C1 C1608X5R0J105K R1 CRCW06032052FT1 U1 MIC2860-2DYC6 Notes: 1. TDK: www.tdk.com 2. Vishay: www.vishay.com 3. Micrel, Inc.: www.micrel.com July 2010 Manufacturer Description (1) TDK 1µF Ceramic Capacitor, 6.3V, X5R, Size 0603 (2) Vishay 9.53kΩ, 1%, Size 0603 (3) Micrel, Inc. ...

Page 11

... Micrel Inc. Package Information July 2010 6-Pin SC-70 (C6) 6-Pin Thin SOT-23 (D6) 11 MIC2860-2D M9999-072010-A ...

Page 12

... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. July 2010 © 2010 Micrel, Incorporated. 12 MIC2860-2D nt M9999-072010-A ...

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