MIC2873 datasheet(4/24 Pages) MICREL

Part #	MIC2873

Description	1.2A High-Brightness Flash LED Driver with Single-Wire Serial Interface

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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Micrel, Inc.

MIC2873

Electrical Characteristics

(6) (Continued)

VIN = 3.6V; L = 1µH; COUT =4.7µF, IOUT = 100mA, TA = 25°C, bold values indicate –40°C

≤ TJ ≤ +125°C, unless otherwise noted.

Symbol

Parameter

Condition

Min.

Typ.

Max.

Units

TSD

Overtemperature

Shutdown Threshold

155

°C

Overtemperature

Shutdown Hysteresis

15

°C

TTO

Safety Timeout Shutdown

Default timer setting

1.25

s

ITO

Safety Timer Current

Threshold

Default current threshold setting

250

mA

VLBVD

Low-Battery Voltage

Detection Threshold

Default LBVD threshold setting

3.0

V

Low-Battery Voltage

Detection Threshold

Accuracy

All low-battery voltage detection threshold

settings

50

mV

VSHORT

LED Short-Circuit

Detection Voltage

Threshold

VOUT - VLED

1.55

1.7

1.85

V

ITEST

LED Short-Circuit

Detection Test Current

1.6

2

2.7

mA

Current Sink Channel

Channel Current Accuracy

VOUT = 4.2V, ILED = 0.20A

−6

6

%

VOUT = 4.2V, ILED = 1.0A

-8

8

VLED

Current Sink Voltage

Dropout

Boost mode

250

mV

FEN Control Pin

VFEN

FEN Threshold Voltage

FLASH ON

1.3

V

FLASH OFF

0.6

FEN Pull-down Current

VFEN = 5.5V

1.3

5

µA

Electrical Characteristics

̶ Single-Wire Interface (Guaranteed by design)

VIN = 3.6V; L = 1µH; COUT =4.7µF, IOUT = 100mA, TA = 25°C, bold values indicate –40°C

≤ TJ ≤ +125°C, unless otherwise noted.

Symbol

Parameter

Condition

Min.

Typ.

Max.

Units

VDC

LOW-Level Input Voltage

0.4

V

HIGH-Level Input Voltage

1.3

V

DC Pull-Down Current

VDC = 5.5V

2.8

5

µA

TON

ON Time

0.1

72

µs

TOFF

OFF Time

0.1

72

µs

TLAT

Latch Time

97

324

µs

TEND

END Time

405

µs

July 17, 2014

4

Revision 1.0

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