LM1577, LM2577

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SNOS658D – JUNE 1999 – REVISED APRIL 2013

Electrical Characteristics—LM1577-ADJ, LM2577-ADJ

Symbol

Parameter

Conditions

Typical

LM1577-ADJ

LM2577-ADJ

Units

(Limits)

SYSTEM PARAMETERS Circuit of Figure 31 (4)

Output Voltage

12.0

V

(1)

11.60/11.40

11.60/11.40

V(min)

12.40/12.60

12.40/12.60

V(max)

Line Regulation

20

mV

50/100

50/100

mV(max)

Load Regulation

20

mV

D

50/100

50/100

mV(max)

η

Efficiency

80

%

DEVICE PARAMETERS

Input Supply Current

7.5

mA

10.0/14.0

10.0/14.0

mA(max)

25

mA

50/85

50/85

mA(max)

Input Supply

2.90

V

Undervoltage Lockout

2.70/2.65

2.70/2.65

V(min)

3.10/3.15

3.10/3.15

V(max)

Oscillator Frequency

Measured at Switch Pin

52

kHz

48/42

48/42

kHz(min)

56/62

56/62

kHz(max)

Reference

Measured at Feedback Pin

V

Voltage

1.230

1.214/1.206

1.214/1.206

V(min)

1.246/1.254

1.246/1.254

V(max)

Reference Voltage

0.5

mV

Line Regulation

Error Amp

100

nA

Input Bias Current

300/800

300/800

nA(max)

Error Amp

3700

μmho

Transconductance

2400/1600

2400/1600

μmho(min)

4800/5800

4800/5800

μmho(max)

Error Amp Voltage Gain

800

V/V

(5)

500/250

500/250

V/V(min)

Error Amplifier

Upper Limit

2.4

V

Output Swing

2.2/2.0

2.2/2.0

V(min)

Lower Limit

0.3

V

0.40/0.55

0.40/0.55

V(max)

(1)

All limits ensured at room temperature (standard type face) and at temperature extremes (boldface type). All limits are used to calculate

Outgoing Quality Level, and are 100% production tested.

(2)

A military RETS electrical test specification is available on request. At the time of printing, the LM1577K-12/883, LM1577K-15/883, and

LM1577K-ADJ/883 RETS specifications complied fully with the boldface limits in these columns. The LM1577K-12/883, LM1577K-

15/883, and LM1577K-ADJ/883 may also be procured to Standard Military Drawing specifications.

(3)

All limits ensured at room temperature (standard type face) and at temperature extremes (boldface type). All room temperature limits are

100% production tested. All limits at temperature extremes are ensured via correlation using standard Statistical Quality Control (SQC)

methods.

(4)

External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the

LM1577/LM2577 is used as shown in the Test Circuit, system performance will be as specified by the system parameters.

(5)

A 1.0 M

actual applications, this pin's load resistance should be

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