LM1577_05 datasheet(7/31 Pages) NSC

Teilenummer	LM1577

Bauteilbeschribung	SIMPLE SWITCHER짰 Step-Up Voltage Regulator

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Electrical Characteristics—LM1577-15, LM2577-15 (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.

LM1577-15

LM2577-15

Units

Symbol

Parameter

Conditions

Typical

Limit

(Limits)

(Notes 3, 4)

(Note 5)

DEVICE PARAMETERS

NPN Switch

V

COMP = 2.0V

4.3

A

Current Limit

3.7/3.0

A(min)

5.3/6.0

A(max)

Electrical Characteristics—LM1577-ADJ, LM2577-ADJ

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, VFEEDBACK =VREF, and ISWITCH =0.

LM1577-ADJ LM2577-ADJ

Units

Symbol

Parameter

Conditions

Typical

Limit

(Limits)

(Notes 3, 4)

(Note 5)

SYSTEM PARAMETERS Circuit of Figure 3 (Note 6)

V

OUT

Output Voltage

V

IN = 5V to 10V

12.0

V

I

LOAD = 100 mA to 800 mA

11.60/11.40

V(min)

(Note 3)

12.40/12.60

V(max)

∆V

OUT/

Line Regulation

V

IN = 3.5V to 10V

20

mV

∆V

IN

I

LOAD = 300 mA

50/100

mV(max)

∆V

OUT/

Load Regulation

V

IN =5V

20

mV

∆I

LOAD

I

LOAD = 100 mA to 800 mA

50/100

mV(max)

η

Efficiency

V

IN = 5V, ILOAD = 800 mA

80

%

DEVICE PARAMETERS

I

S

Input Supply Current

V

FEEDBACK = 1.5V (Switch Off)

7.5

mA

10.0/14.0

mA(max)

I

SWITCH = 2.0A

25

mA

V

COMP = 2.0V (Max Duty Cycle)

50/85

mA(max)

V

UV

Input Supply

I

SWITCH = 100 mA

2.90

V

Undervoltage Lockout

2.70/2.65

V(min)

3.10/3.15

V(max)

f

O

Oscillator Frequency

Measured at Switch Pin

52

kHz

I

SWITCH = 100 mA

48/42

kHz(min)

56/62

kHz(max)

V

REF

Reference

Measured at Feedback Pin

V

Voltage

V

IN = 3.5V to 40V

1.230

1.214/1.206

V(min)

V

COMP = 1.0V

1.246/1.254

V(max)

∆V

REF/

Reference Voltage

V

IN = 3.5V to 40V

0.5

mV

∆V

IN

Line Regulation

I

B

Error Amp

V

COMP = 1.0V

100

nA

Input Bias Current

300/800

nA(max)

G

M

Error Amp

I

COMP = −30 µA to +30 µA

3700

µmho

Transconductance

V

COMP = 1.0V

2400/1600

µmho(min)

4800/5800

µmho(max)

A

VOL

Error Amp

V

COMP = 1.1V to 1.9V

800

V/V

Voltage Gain

R

COMP = 1.0 M

Ω (Note 7)

500/250

V/V(min)

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