LM1577 datasheet(2/27 Pages) NSC

2 / 27 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage

45V

Output Switch Voltage

65V

Output Switch Current (Note 2)

6.0A

Power Dissipation

Internally Limited

Storage Temperature Range

−65˚C to +150˚C

Lead Temperature

(Soldering, 10 sec.)

260˚C

Maximum Junction Temperature

150˚C

Minimum ESD Rating

(C = 100 pF, R = 1.5 k

Ω)2 kV

Operating Ratings

Supply Voltage

3.5V

≤ V

IN ≤ 40V

Output Switch Voltage

≤ V

SWITCH ≤ 60V

Output Switch Current

SWITCH ≤ 3.0A

Junction Temperature Range

LM1577

−55˚C

≤ T

J ≤ +150˚C

LM2577

−40˚C

≤ T

J ≤ +125˚C

Electrical Characteristics — LM1577-12, LM2577-12

Specifications with standard type face are for T

J = 25˚C, and those in bold type face apply over full Operating Temperature

Range. Unless otherwise specified, V

IN = 5V, and ISWITCH = 0.

LM1577-12

LM2577-12

Units

Symbol

Parameter

Conditions

Typical

Limit

(Limits)

(Notes 3, 4)

(Note 5)

SYSTEM PARAMETERS Circuit of

Figure 1 (Note 6)

OUT

Output Voltage

IN = 5V to 10V

12.0

LOAD = 100 mA to 800 mA

11.60/11.40

V(min)

(Note 3)

12.40/12.60

V(max)

Line Regulation

IN = 3.5V to 10V

LOAD = 300 mA

50/100

mV(max)

Load Regulation

IN = 5V

LOAD = 100 mA to 800 mA

50/100

mV(max)

Efficiency

IN = 5V, ILOAD = 800 mA

DEVICE PARAMETERS

Input Supply Current

FEEDBACK = 14V (Switch Off)

7.5

10.0/14.0

mA(max)

SWITCH = 2.0A

COMP = 2.0V (Max Duty Cycle)

50/85

mA(max)

Input Supply

SWITCH = 100 mA

2.90

Undervoltage Lockout

2.70/2.65

V(min)

3.10/3.15

V(max)

Oscillator Frequency

Measured at Switch Pin

kHz

SWITCH = 100 mA

48/42

kHz(min)

56/62

kHz(max)

REF

Output Reference

Measured at Feedback Pin

Voltage

IN = 3.5V to 40V

11.76/11.64

V(min)

COMP = 1.0V

12.24/12.36

V(max)

Output Reference

IN = 3.5V to 40V

7mV

Voltage Line Regulator

Feedback Pin Input

9.7

Ω

Resistance

Error Amp

COMP = −30 µA to +30 µA

370

µmho

Transconductance

COMP = 1.0V

225/145

µmho(min)

515/615

µmho(max)

VOL

Error Amp

COMP = 1.1V to 1.9V

V/V

Voltage Gain

COMP = 1.0 MΩ

50/25

V/V(min)

(Note 7)

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