LM2575 datasheet(3/10 Pages) TI

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Electrical Characteristics

LM2575

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR

SLVS569E – JANUARY 2005 – REVISED JANUARY 2006

LOAD = 200 mA, VIN = 12 V (unless otherwise noted) (see Figure 1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOUT = 5 V, ILOAD = 0.2 A

°C

1.217

1.23

1.243

VOUT

Feedback voltage

°C

1.193

1.23

1.267

8 V

≤ V

IN ≤ 40 V, VOUT = 5 V,

0.2 A

≤ I

LOAD ≤ 1 A

Full range

1.18

1.28

Efficiency

VIN = 12 V, VOUT = 5 V, ILOAD = 1 A

°C

100

IIB

Feedback bias current

VOUT = 5 V

Full range

500

°C

Oscillator frequency(1)

kHz

Full range

°C

0.9

1.2

VSAT

Saturation voltage

IOUT = 1 A(2)

Full range

1.4

Maximum duty cycle(3)

°C

1.7

2.8

3.6

ICL

Peak current(1)(2)

Full range

1.3

VIN = 40(4), Output = 0 V

Output leakage current

°C

VIN = 40(4), Output = –1 V

7.5

Quiescent current(4)

°C

ISTBY

Standby quiescent current

OFF (ON/OFF pin = 5 V)

°C

200

µA

°C

2.2

1.4

VIH

OFF (VOUT = 0 V)

Full range

2.4

ON/OFF logic input level

°C

1.2

VIL

ON (VOUT = nominal voltage)

Full range

0.8

IIH

OFF (ON/OFF pin = 5 V)

ON/OFF input current

°C

µA

IIL

ON (ON/OFF pin = 0 V)

(1)

In the event of an output short or an overload condition, self-protection features lower the oscillator frequency to

∼18 kHz and the

minimum duty cycle from 5% to

∼2%. The resulting output voltage drops to ∼40% of its nominal value, causing the average power

dissipated by the IC to lower.

(2)

Output is not connected to diode, inductor, or capacitor. Output is sourcing current.

(3)

Feedback is disconnected from output and connected to 0 V.

(4)

To force the output transistor off, FEEDBACK is disconnected from output and connected to 12 V.

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