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WLED Driver. MIC4812 Datasheet

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WLED Driver. MIC4812 Datasheet
















MIC4812 Driver. Datasheet pdf. Equivalent













Part

MIC4812

Description

High Current 6 Channel Linear WLED Driver



Feature


MIC4812 High Current 6 Channel Linear WL ED Driver with DAM™ and Ultra Fast PW M™ Control General Description Feat ures The MIC4812 is a high efficiency linear White LED (WLED) driver designed to drive up to six high current WLEDs for signage lighting. The MIC4812 provi des the highest possible efficiency as this architecture has no switching loss es present in traditio.
Manufacture

Micrel Semiconductor

Datasheet
Download MIC4812 Datasheet


Micrel Semiconductor MIC4812

MIC4812; nal charge pumps or inductive boost circ uits. The MIC4812 provides six linear d rivers which maintain constant current for up to six WLEDs. It features a typi cal dropout of 190mV at 100mA. The MIC4 812 features Dynamic Average Matching (DAM™) which is specifically design ed to provide optimum matching across a ll WLEDs. The high accuracy (±1% typic al) current regulated W.


Micrel Semiconductor MIC4812

LED channels ensure uniform display illu mination under all conditions. The brig htness is controlled through an Ultra F ast PWM™ interface operating down to less than 1% duty cycle. The MIC4812 is available in an 10-pin MSOP ePad packa ge with a juncti .


Micrel Semiconductor MIC4812

.





Part

MIC4812

Description

High Current 6 Channel Linear WLED Driver



Feature


MIC4812 High Current 6 Channel Linear WL ED Driver with DAM™ and Ultra Fast PW M™ Control General Description Feat ures The MIC4812 is a high efficiency linear White LED (WLED) driver designed to drive up to six high current WLEDs for signage lighting. The MIC4812 provi des the highest possible efficiency as this architecture has no switching loss es present in traditio.
Manufacture

Micrel Semiconductor

Datasheet
Download MIC4812 Datasheet




 MIC4812
MIC4812
High Current 6 Channel Linear WLED
Driver with DAM™ and Ultra Fast
PWM™ Control
General Description
Features
The MIC4812 is a high efficiency linear White LED
(WLED) driver designed to drive up to six high current
WLEDs for signage lighting. The MIC4812 provides the
highest possible efficiency as this architecture has no
switching losses present in traditional charge pumps or
inductive boost circuits. The MIC4812 provides six linear
drivers which maintain constant current for up to six
WLEDs. It features a typical dropout of 190mV at 100mA.
The MIC4812 features Dynamic Average Matching™
(DAM™) which is specifically designed to provide optimum
matching across all WLEDs. The high accuracy (±1%
typical) current regulated WLED channels ensure 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 MIC4812 is available in an 10-pin MSOP ePad
package 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.
High Efficiency (no Voltage Boost losses)
Ultra Fast PWM™ control (200Hz to 500kHz)
Input voltage range: 3.0V to 5.5V
LED current range up to 100mA per channel
Programmable LED current with external resistor
Dropout of 190mV at 100mA
Matching better than ±1% (typical)
Current Accuracy better than ±1% (typical)
Maintains proper regulation regardless of how many
channels are utilized
10-pin MSOP with ePad package
Applications
Billboard displays
Marquee displays
Instrument displays
LCD display modules
____________________________________________________________________________________________________________
Typical Application
High Current Lighting (Six WLEDs)
Ultra Fast PWM, DAM and Dynamic Average Matching are trademark of Micrel, 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
April 2011
M9999-041911-B




 MIC4812
Micrel Inc.
Ordering Information
Part Number
Mark Code
MIC4812YMME
4812
Junction Temperature Range
–40°C to +125°C
Pin Configuration
MIC4812
Package
10-Pin ePad MSOP
10-Pin ePad MSOP (MME)
(Top View)
Pin Description
Pin Number
1
2
Pin Name
VIN
EN
3 RSET
4
5
6
7
8
9
10
ePad
GND
D6
D5
D4
D3
D2
D1
HS PAD
Pin Function
Voltage Input. Connect at least 2.2µF ceramic capacitor between VIN and GND.
Enable LED drivers. This pin can be used as a PWM input for dimming of WLEDs. Do not leave
floating.
An internal 1.27V reference sets the nominal maximum WLED current. Example, apply a 8.25k
resistor between RSET and GND to set LED current to 100mA at 100% duty cycle.
Ground.
LED6 driver input. Connect LED anode to VIN and cathode to this pin.
LED5 driver input. Connect LED anode to VIN and cathode to this pin.
LED4 driver input. Connect LED anode to VIN and cathode to this pin.
LED3 driver input. Connect LED anode to VIN and cathode to this pin.
LED2 driver input. Connect LED anode to VIN and cathode to this pin.
LED1 driver input. Connect LED anode to VIN and cathode to this pin.
Heat sink pad. Not internally connected. Connect to ground.
April 2011
2 M9999-041419-B




 MIC4812
Micrel Inc.
MIC4812
Absolute Maximum Ratings(1)
Main Input Voltage (VIN) .................................. –0.3V to +6V
Enable Input Voltage (VEN).............................. –0.3V to +6V
LED Driver Voltage (VD1-D6) ............................ –0.3V to +6V
Power Dissipation .....................................Internally Limited
Lead Temperature (soldering, 10sec.)....................... 260°C
SEStoDraRgeatTinegm(3p).e...r.a..t.u..r.e...(.T..s..)....................................................–..6..5..°.C....t.o...+..115.50k°CV
Operating Ratings(2)
Supply Voltage (VIN)..................................... +3.0V to +5.5V
Enable Input Voltage (VEN) .................................... 0V to VIN
LED Driver Voltage (VD1-D6) ................................... 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
ePad MSOP-10L (θJA) ....................................76.7°C/W
Electrical Characteristics
VIN = VEN = 5V, RSET = 8.25k; VD1-D6 = 1.2V; TJ = 25°C, bold values indicate –40°C TJ 125°C; unless noted.
Parameter
Current Accuracy(4)
Matching(5)
Conditions
Min Typ Max
96 101 106
1 3.6
Drop-out
Ground/Supply Bias Current
Where ILED = 90% of LED current seen at
VDROPNOM = 1.2V, 100% brightness level
190 320
3.2 4.2
Shutdown Current
PWM Dimming
VEN = 0V
0.01 1
Enable Input Voltage (VEN)
Logic Low
Logic High
0.2
1.2
Enable Input Current
Current Source Delay
(50% levels)
VIH > 1.2V
Shutdown to on
Standby to on
On to Standby
0.01 1
40 60
1
0.3
Current Source Transient Time
(10%-90%)
TRISE
TFALL
1
0.3
Stand-by to Shutdown Time
VEN = 0V
10 20 40
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.
Units
mA
%
mV
mA
µA
V
V
µA
µs
µs
µs
µs
µs
ms
April 2011
3 M9999-041419-B




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