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White LED Step-Up Converter

IXYS CORPORATION 

MX841

IXYS

Absolute Maximum Ratings (Voltages with respect to GND=0V)

Parameter

Min

Max Unit

VDD Supply Voltage

CTRL Voltage

ISENSE Voltage

SW Voltage

-0.4

+6.5

V

GND-0.4 VDD+0.4 V

GND-0.4 VDD+0.4 V

-0.4 +24.0 V

OVD Voltage

-0.4

Operating Ambient Temperature Range -40

Storage Temperature Range

-55

Operating Junction Temperature Range -40

+24.0 V

+85

Co

+150 Co

+125 Co

Power Dissipation Standard SOIC θJA = 114°C/W

775 mW

TA = 27°C

Exposed Pad SOIC θJA = 50°C/W 1.75

W

Absolute Maximum Ratings are

stress ratings. Stresses in excess of

these ratings can cause permanent

damage to the device. Functional

operation of the device at these or

any other conditions beyond those

indicated in the operational sections

of this data sheet is not implied.

Exposure of the device to the

absolute maximum ratings for an

extended period may degrade the

device and affect its reliability.

ESD Warning

ESD (electrostatic discharge) sensitive device. Although the MX841 features proprietary ESD protection circuitry,

permanent damage may be sustained if subjected to high energy electrostatic discharges. Proper ESD precautions

are recommended to avoid performance degradation or loss of functionality.

DC Electrical Characteristics

VDD=3.0V, RSENSE=5Ω, VCTRL=1.0V, L=6.8µH, CBYP=1µF, TA = -40oC to +85oC, Typical Values at +25oC

Unless otherwise specified

Parameter

Supply Voltage

TA = 25 oC

Condition

Min

Typ Max

1.1

5.5

Supply Current Overvoltage

Not Switching: VCTRL = 260mV

VRSENSE > 13 X VCTRL

Supply Current Operating

Sleep Current

Switching: VCTRL= VDD, VRSENSE=GND

VCTRL < 100mV

TA = +25oC

TA = +85oC

CTRL Bias Current

-10

0.5 0.8

2

6

7

ISENSE Bias Current

OVD Bias Current

Over Voltage Threshold

OVD = 18V

OVD Rising

OVD Falling

VCTRL >260mV

VCTRL = GND

18.5

-7

20

0

22

CTRL / VRSENSE

13

VCTRL Sleep Mode

VCTRL Rising

VCTRL Falling

260

100

SW On Resistance

VSW = 0.1V

1.9

VSW = 0.5V

2.2

Switch Current

VDD=1.2V, L=33µH

30

VDD=5.5V, L=2.5µH

2

SW Voltage Range

SW Leakage Current

OVD = VSW = 18V

TA = +25oC

TA = +85oC

VDD -

VSCHOTTKY

20

0.1

0.3

VCTRL

0

VDD

Unit

V

mA

µA

µA

µA

µA

µA

V

V

V/V

mV

mV

Ω

Ω

mA

A

V

µA

µA

V

MX841

Drawing No. 17023

2

Preliminary

03/10/05

www.ixys.net

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