MIC2844A View Datasheet(PDF) - Micrel

Part Name

Description

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MIC2844A

High Efficiency 6 Channel WLED Driver with DAM™ and Single Wire Digital Control

Micrel 

Micrel Inc.

MIC2844A

Absolute Maximum Ratings(1)

Main Input Voltage (VIN) .................................. –0.3V to +6V

Enable Input Voltage (VDC).............................. –0.3V to +6V

LED Driver Voltage (VD1-D6) ............................ –0.3V to +6V

Power Dissipation .....................................Internally Limited

Lead Temperature (soldering, 10sec.)....................... 260°C

Storage Temperature (Ts) .........................–65°C to +150°C

ESD Rating(3)................................................. ESD Sensitive

Operating Ratings(2)

Supply Voltage (VIN)..................................... +3.0V to +5.5V

Enable Input Voltage (VDC) .................................... 0V to VIN

LED Driver Voltage (VD1-D6) ................................... 0V to VIN

Junction Temperature (TJ) ........................ –40°C to +125°C

Junction Thermal Resistance

2mm x 2mm Thin MLF® (θJA).............................90°C/W

Electrical Characteristics

VIN = VDC = 3.8V, RSET = 20.5kΩ; VD1-D6 = 0.6V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ 125°C; unless noted.

Parameter

Current Accuracy(4)

Matching(5)

Conditions

Min

Typ

Max Units

1.5

%

1.5

3.6

%

Drop-out

Where ILED = 90% of LED current seen at

VDROPNOM = 0.6V, 100% brightness level

40

80

mV

Ground/Supply Bias Current

Shutdown Current

(current source leakage)

ILED = 20mA

VDC = 0V > 1260µs

1.4

1.8

mA

0.01

1

µA

Digital Dimming

DC Input Voltage (VDC)

Logic Low

Logic High

0.2

V

1.2

V

Enable Input Current

tSHUTDOWN

VDC = 1.2V

Time DC pin is low to put into shutdown

0.01

1

µA

1260

µs

tMODE_UP

Time DC pin is low to change to Count Up Mode

100

160

µs

tMODE_DOWN

Time DC pin is low to change to Count Down Mode

420

500

µs

tPROG_HIGH, tPROG_LOW

tDELAY

Time for valid edge count; Ignored if outside limit range

2

Time DC pin must remain high before a mode change

100

can occur

32

µs

µs

tPROG_SETUP

First down edge must occur in this window during

5

presetting brightness

75

µs

tSTART_UP

Delay from DC is high to start up

140

µs

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, 1.5kΩ in 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.

August 2009

3

M9999-080309-D

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