LM2575 datasheet(2/10 Pages) TI

2 / 10 page

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Internal

Regulator

ON/OFF

1.23-V

Band-Gap

Reference

52-kHz

Oscillator

Reset

Thermal

Shutdown

Current

Limit

FEEDBACK

CIN

VIN

Unregulated

DC Input

GND

5, 12, 13

OUTPUT

ON/OFF

COUT

VOUT

1-A

Switch

Driver

Fixed-Gain

Error Amp

Comparator

R1 = Open, R2 = 0

Ω

Absolute Maximum Ratings

(1)

Package Thermal Data

(1)

Recommended Operating Conditions

LM2575

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR

SLVS569E – JANUARY 2005 – REVISED JANUARY 2006

FUNCTIONAL BLOCK DIAGRAM

over operating free-air temperature range (unless otherwise noted)

MIN

MAX

UNIT

VIN

Supply voltage

ON/OFF pin input voltage

–0.3

VIN

Output voltage to GND (steady state)

–1

Maximum junction temperature

150

°C

Tstg

Storage temperature range

–65

150

°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.

PACKAGE

BOARD

PDIP (N)

High K, JESD 51-7

°C/W

(1)

Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient

temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

over operating free-air temperature range (unless otherwise noted)

MIN

MAX

UNIT

VIN

Supply voltage

4.75

Operating virtual junction temperature

–40

125

°C

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