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The TPS61040/41 limits this inrush current by increasing the current limit in two steps starting from

I

LIM

4

for 256

cycles to

I

LIM

ENABLE

UNDERVOLTAGE LOCKOUT

ABSOLUTE MAXIMUM RATINGS

DISSIPATION RATING TABLE

(1)

RECOMMENDED OPERATING CONDITIONS

TPS61040

TPS61041

SLVS413B – OCTOBER 2002 – REVISED MAY 2004

DETAILED DESCRIPTION (continued)

Pulling the enable (EN) to ground shuts down the device reducing the shutdown current to 1 µA (typical). Since

there is a conductive path from the input to the output through the inductor and Schottky diode, the output

voltage is equal to the input voltage during shutdown. The enable pin needs to be terminated and should not be

left floating. Using a small external transistor disconnects the input from the output during shutdown as shown in

Figure 18.

An undervoltage lockout prevents misoperation of the device at input voltages below typical 1.5 V.When the input

voltage is below the undervoltage threshold the main switch is turned off.

UNIT

-0.3 V to 7 V

30 V

Continuous power dissipation

See Dissipation Rating Table

Operating junction temperature

-40

°C to 150°C

Storage temperature

-65

°C to 150°C

Lead temperature (soldering 10 seconds)

260

°C

(1)

Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

All voltage values are with respect to network ground terminal.

DERATING FACTOR

PACKAGE

POWER RATING

POWER RATING

POWER RATING

DBV

357 mW

3.5 mW/

°C

192 mW

140 mW

(1)

The thermal resistance junction to ambient of the 5-pin SOT23 is 250

°C/W.

MIN

TYP

MAX

UNIT

Vin

Input voltage range

1.8

6

V

Output voltage range

28

V

L

2.2

10

µH

f

1

MHz

4.7

µF

1

µF

Operating ambient temperature

-40

85

°C

Operating junction temperature

-40

125

°C

(1)

Refer to application section for further information

4