October 1998

4-123

LM2576

Micrel

4

Electrical Characteristics (continued)

LM2576

Units

Symbol

Parameter

Conditions

Typ

Limit

(Limits)

(Note 2)

DEVICE PARAMETERS, ADJUSTABLE REGULATOR

I

B

Feedback Bias Current

V

50

100/500

nA

DEVICE PARAMETERS, FIXED and ADJUSTABLE REGULATORS

f

O

Oscillator Frequency

52

kHz

47/42

kHz (min)

58/63

kHz (max)

V

SAT

Saturation Voltage

I

1.4

V

1.8/2.0

V(max)

DC

Max Duty Cycle (ON)

(Note 5)

98

%

93

%(min)

I

CL

Current Limit

Peak Current, t

5.8

A

4.2/3.5

A(min)

6.9/7.5

A(max)

I

L

Output Leakage Current

V

Output = 0V

2

mA(max)

Output = –1V

7.5

mA

(Note 6)

Output = –1V

30

mA(max)

I

Q

Quiescent Current

(Note 6)

5

mA

10

mA(max)

I

STBY

Standby Quiescent

ON/OFF Pin = 5V (OFF)

50

µA

Current

200

µA(max)

θ

JA

Thermal Resistance

T,U Package, Junction to Ambient (Note 7)

65

°C/W

θ

JA

T,U Package, Junction to Ambient (Note 8)

45

θ

JC

T,U Package, Junction to Case

2