MIC4802 datasheet(3/12 Pages) MICREL

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Micrel Inc.

MIC4802

January 2011

M9999-013111-B

Absolute Maximum Ratings(1)

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

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

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

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

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

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

Operating Ratings(2)

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

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

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

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

Junction Thermal Resistance

EPAD SOIC-8L (

θJA)..........................................41°C/W

Electrical Characteristics

VIN = VEN = 5V, RSET = 6.19kΩ; VD1 = 1.2V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ 125°C; unless noted.

Parameter

Conditions

Min

Typ

Max

Units

Current Accuracy

(3)

747

830

913

Drop-out

Where ILED = 90% of LED current seen at

VDROPNOM = 1.2V, 100% brightness level

280

500

Ground/Supply Bias Current

IOUT = 830mA

4.1

5.7

Shutdown Current

VEN = 0V

0.01

µA

PWM Dimming

Logic Low

0.2

Enable Input Voltage (VEN)

Logic High

1.2

Enable Input Current

VIH > 1.2V

0.01

µA

Current Source Delay

(50% levels)

Shutdown to on

Standby to on

On to Standby

0.3

µs

Current Source Transient Time

(10%-90%)

TRISE

TFALL

0.3

µs

Stand-by to Shutdown Time

VEN = 0V

Notes:

1. Exceeding the absolute maximum rating may damage the device.

2. The device is not guaranteed to function outside its operating rating.

3. As determined by average current based on RSET resistance.

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