Datasheet

LM1577, LM2577
www.ti.com SNOS658D –JUNE 1999–REVISED APRIL 2013
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 I
SWITCH
= 0.
Symbol Parameter Conditions Typical LM1577-15 LM2577-15 Units
Limit
(1)(2)
Limit
(3)
(Limits)
SYSTEM PARAMETERS Circuit of Figure 30
(4)
V
OUT
Output Voltage V
IN
= 5V to 12V 15.0 V
I
LOAD
= 100 mA to 600 mA
14.50/14.25 14.50/14.25 V(min)
(1)
15.50/15.75 15.50/15.75 V(max)
Line Regulation V
IN
= 3.5V to 12V 20 mV
I
LOAD
= 300 mA mV(max)
50/100 50/100
Load Regulation V
IN
= 5V 20 mV
I
LOAD
= 100 mA to 600 mA mV(max)
50/100 50/100
η Efficiency V
IN
= 5V, I
LOAD
= 600 mA 80 %
DEVICE PARAMETERS
I
S
Input Supply Current V
FEEDBACK
= 18.0V 7.5 mA
(Switch Off)
10.0/14.0 10.0/14.0 mA(max)
I
SWITCH
= 2.0A 25 mA
V
COMP
= 2.0V
50/85 50/85 mA(max)
(Max Duty Cycle)
V
UV
Input Supply I
SWITCH
= 100 mA 2.90 V
Undervoltage
2.70/2.65 2.70/2.65 V(min)
Lockout
3.10/3.15 3.10/3.15 V(max)
f
O
Oscillator Frequency Measured at Switch Pin 52 kHz
I
SWITCH
= 100 mA
48/42 48/42 kHz(min)
56/62 56/62 kHz(max)
V
REF
Output Reference Measured at Feedback Pin V
Voltage V
IN
= 3.5V to 40V
15 14.70/14.55 14.70/14.55 V(min)
V
COMP
= 1.0V
15.30/15.45 15.30/15.45 V(max)
Output Reference V
IN
= 3.5V to 40V 10 mV
Voltage Line Regulation
R
FB
Feedback Pin Input 12.2 kΩ
Voltage Line Regulator
G
M
Error Amp I
COMP
= −30 μA to +30 μA 300 μmho
Transconductance V
COMP
= 1.0V
170/110 170/110 μmho(min)
420/500 420/500 μmho(max)
A
VOL
Error Amp V
COMP
= 1.1V to 1.9V 65 V/V
Voltage Gain R
COMP
= 1.0 MΩ
(5)
40/20 40/20 V/V(min)
(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 MΩ resistor is connected to the compensation pin (which is the error amplifier's output) to ensure accuracy in measuring A
VOL
. In
actual applications, this pin's load resistance should be ≥10 MΩ, resulting in A
VOL
that is typically twice the ensured minimum limit.
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