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WLED Driver. MIC2860-D Datasheet

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WLED Driver. MIC2860-D Datasheet






MIC2860-D Driver. Datasheet pdf. Equivalent




MIC2860-D Driver. Datasheet pdf. Equivalent





Part

MIC2860-D

Description

High Efficiency 2 Channel WLED Driver



Feature


MIC2860-D High Efficiency 2 Channel WLED Driver with Single Wire Digital Contro l General Description The MIC2860-2D i s a high efficiency White LED (WLED) dr iver designed to drive two WLEDs and gr eatly extend battery life for portable display backlighting, and keypad backli ghting in low cost mobile devices. The MIC2860-2D architecture provides the hi ghest possible eff.
Manufacture

Micrel Semiconductor

Datasheet
Download MIC2860-D Datasheet


Micrel Semiconductor MIC2860-D

MIC2860-D; iciency 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 dr iven directly from the battery eliminat ing switching noise and losses present with the use of boost circuitry. The tw o channels have better than ±0.5% matc hing, which ensures.


Micrel Semiconductor MIC2860-D

uniform display illumination under all conditions. The WLEDs brightness is ext ernally preset by a resistor and dimmed using a single wire digital control si gnal. The MIC2860-2D single wire digita l interface accepts digital programming pulses providing 32 dim .


Micrel Semiconductor MIC2860-D

.

Part

MIC2860-D

Description

High Efficiency 2 Channel WLED Driver



Feature


MIC2860-D High Efficiency 2 Channel WLED Driver with Single Wire Digital Contro l General Description The MIC2860-2D i s a high efficiency White LED (WLED) dr iver designed to drive two WLEDs and gr eatly extend battery life for portable display backlighting, and keypad backli ghting in low cost mobile devices. The MIC2860-2D architecture provides the hi ghest possible eff.
Manufacture

Micrel Semiconductor

Datasheet
Download MIC2860-D Datasheet




 MIC2860-D
MIC2860-D
High Efficiency 2 Channel WLED Driver
with Single Wire Digital Control
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.
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
____________________________________________________________________________________________________________
Typical Application
LCD Display Backlight with 2 WLEDs
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2010
M9999-072010-A




 MIC2860-D
Micrel Inc.
Ordering Information
Part Number
Mark Code(1)
Temperature Range
MIC2860-2DYC6
62D
–40°C to +85°C
MIC2860-2DYD6
602D
–40°C to +85°C
Note:
1. Under bar symbol ( _ ) may not be to scale.
2. Package is GREEN RoHS compliant. Lead finish is NiPdAu. Mold compound is halogen free.
Pin Configuration
MIC2860-2D
Package(2)
6-Pin SC-70
6-Pin Thin SOT-23
6-Pin SC-70 (C6)
(Top View)
6-Pin Thin SOT-23 (D6)
(Top View)
Pin Description
Pin Number
MIC2860-2D
1
2
3
4
5
Pin Name
SC
GND
VIN
D2
RSET
6 D1
Pin Function
Serial Control Digital input. Do not leave floating.
Ground.
Voltage Input. Connect at least 1µF ceramic capacitor between VIN and GND.
LED2 driver. Connect LED anode to VIN and cathode to this pin. Do not leave floating.(1)
Connect an external resistor from this pin to GND to set the maximum LED current. Example,
apply a 9.53kresistor 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. (1)
Note 1. When driving only 1 LED, connect D1 and D2 in parallel to the LED cathode and adjust the RSET resistor for half the desired output.
July 2010
2 M9999-072010-A




 MIC2860-D
Micrel Inc.
MIC2860-2D
Absolute Maximum Ratings(1)
Main Input Voltage (VIN) ................................... -0.3V to +6V
Enable Input Voltage (VSC).................................-0.3V to VIN
LED Driver Voltage (VD1, D2) ..............................-0.3V to VIN
Power Dissipation .....................................Internally Limited
Lead Temperature (soldering, 10sec.)....................... 260°C
SEStoDraRgeatTinegm(3p).e...r.a..t.u..r.e...(.T..s..)......................................................-.6. 5E°SCDtoS+en1s5i0ti°vCe
Operating Ratings(2)
Supply Voltage (VIN)..................................... +3.0V to +5.5V
Enable Input Voltage (VSC) .................................... 0V to VIN
LED Driver Voltage (VD1, D2) .................................. 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
SC-70 (θJA).....................................................256 °C /W
SOT-23 (θJA) ..................................................177 °C /W
Electrical Characteristics
VIN = VSC = 3.6V, CIN = 1µF, RSET = 9.53k; VD1, D2 = 0.6V; TJ = 25°C, bold values indicate –40°C TJ 85°C; unless
noted.
Parameter
Current Accuracy(4)
Matching(5)
Conditions
Min
27.18
Drop-out (VD1, D2)
Where ILED = 90% of LED current seen at
VDROPNOM = 0.6V, 100% brightness level
Ground/Supply Bias Current
Shutdown Current
(current source leakage)
IOUT = 30.2mA
VSC = 0V > 500µs
Digital Dimming
VSC Input Voltage
Logic Low
Logic High
1.4
VSC Enable Input Current
tSHUTDOWN
VSC = 1.2V
Time SC pin is low to put into shutdown
tPROG_HIGH, tPROG_LOW
tSTART_UP
Time for valid SC edge; Ignored if outside limit range
Delay from SC is high to start up
0.3
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kin series with 100pF.
4. As determined by average current of all channels in use and all channels loaded.
5. The current through each LED meets the stated limits from the average current of all LEDs.
Typ
30.2
±0.5
52
0.7
0.01
0.01
100
33
Max
33.22
±3
125
1.5
1
Units
mA
%
mV
mA
µA
0.4 V
V
1 µA
500 µs
75 µs
µs
July 2010
3 M9999-072010-A



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