LM1577 datasheet(5/31 Pages) NSC

Teilenummer	LM1577

Bauteilbeschribung	SIMPLE SWITCHER짰 Step-Up Voltage Regulator

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Electrical Characteristics—LM1577-12, LM2577-12 (Continued)

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)

DEVICE PARAMETERS

A

VOL

Error Amp

V

COMP = 1.1V to 1.9V

80

V/V

Voltage Gain

R

COMP = 1.0 M

Ω

50/25

V/V(min)

(Note 7)

Error Amplifier

Upper Limit

2.4

V

Output Swing

V

FEEDBACK = 10.0V

2.2/2.0

V(min)

Lower Limit

0.3

V

FEEDBACK = 15.0V

0.40/0.55

V(max)

Error Amplifier

V

FEEDBACK = 10.0V to 15.0V

±200

µA

Output Current

V

COMP = 1.0V

±130/±90

µA(min)

±300/±400

µA(max)

I

SS

Soft Start Current

V

FEEDBACK = 10.0V

5.0

µA

V

COMP = 0V

2.5/1.5

µA(min)

7.5/9.5

µA(max)

D

Maximum Duty Cycle

V

COMP = 1.5V

95

%

I

SWITCH = 100 mA

93/90

%(min)

Switch

Transconductance

12.5

A/V

I

L

Switch Leakage

V

SWITCH = 65V

10

µA

Current

V

FEEDBACK = 15V (Switch Off)

300/600

µA(max)

V

SAT

Switch Saturation

I

SWITCH = 2.0A

0.5

V

Voltage

V

COMP = 2.0V (Max Duty Cycle)

0.7/0.9

V(max)

NPN Switch

4.5

A

Current Limit

3.7/3.0

A(min)

5.3/6.0

A(max)

Electrical Characteristics—LM1577-15, LM2577-15

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.

LM1577-15

LM2577-15

Units

Symbol

Parameter

Conditions

Typical

Limit

(Limits)

(Notes 3, 4)

(Note 5)

SYSTEM PARAMETERS Circuit of Figure 2 (Note 6)

V

OUT

Output Voltage

V

IN = 5V to 12V

15.0

V

I

LOAD = 100 mA to 600 mA

14.50/14.25

V(min)

(Note 3)

15.50/15.75

V(max)

Line Regulation

V

IN = 3.5V to 12V

20

50/100

mV

I

LOAD = 300 mA

mV(max)

Load Regulation

V

IN =5V

20

50/100

mV

I

LOAD = 100 mA to 600 mA

mV(max)

η

Efficiency

V

IN = 5V, ILOAD = 600 mA

80

%

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