LM1577, LM2577
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SNOS658D –JUNE 1999–REVISED APRIL 2013
Electrical Characteristics—LM1577-ADJ, LM2577-ADJ
Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V, VFEEDBACK = VREF, and ISWITCH = 0.
Symbol
Parameter
Conditions
Typical
LM1577-ADJ LM2577-ADJ
Units
(Limits)
Limit(1)(2)
Limit(3)
(4)
SYSTEM PARAMETERS Circuit of Figure 31
VOUT
Output Voltage
Line Regulation
VIN = 5V to 10V
12.0
V
V(min)
V(max)
mV
ILOAD = 100 mA to 800 mA(1)
11.60/11.40
12.40/12.60
11.60/11.40
12.40/12.60
ΔVOUT/ΔVIN
VIN = 3.5V to 10V
ILOAD = 300 mA
20
20
50/100
50/100
50/100
50/100
mV(max)
mV
ΔVOUT/ΔILOA Load Regulation
D
VIN = 5V
ILOAD = 100 mA to 800 mA
mV(max)
%
η
Efficiency
VIN = 5V, ILOAD = 800 mA
80
DEVICE PARAMETERS
IS
Input Supply Current
VFEEDBACK = 1.5V (Switch Off)
7.5
25
mA
mA(max)
mA
10.0/14.0
50/85
10.0/14.0
50/85
ISWITCH = 2.0A
VCOMP = 2.0V (Max Duty Cycle)
mA(max)
V
VUV
Input Supply
ISWITCH = 100 mA
2.90
Undervoltage Lockout
2.70/2.65
3.10/3.15
2.70/2.65
3.10/3.15
V(min)
V(max)
kHz
fO
Oscillator Frequency
Measured at Switch Pin
ISWITCH = 100 mA
52
48/42
56/62
48/42
56/62
kHz(min)
kHz(max)
V
VREF
Reference
Voltage
Measured at Feedback Pin
VIN = 3.5V to 40V
VCOMP = 1.0V
1.230
1.214/1.206
1.246/1.254
1.214/1.206
1.246/1.254
V(min)
V(max)
mV
ΔVREF/ΔVIN
Reference Voltage
Line Regulation
VIN = 3.5V to 40V
VCOMP = 1.0V
0.5
IB
Error Amp
Input Bias Current
100
nA
nA(max)
μmho
300/800
300/800
GM
Error Amp
ICOMP = −30 μA to +30 μA
3700
Transconductance
VCOMP = 1.0V
2400/1600
4800/5800
2400/1600
4800/5800
μmho(min)
μmho(max)
V/V
AVOL
Error Amp Voltage Gain VCOMP = 1.1V to 1.9V
800
2.4
0.3
RCOMP = 1.0 MΩ(5)
500/250
2.2/2.0
500/250
2.2/2.0
V/V(min)
V
Error Amplifier
Output Swing
Upper Limit
VFEEDBACK = 1.0V
V(min)
V
Lower Limit
VFEEDBACK = 1.5V
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 MΩ resistor is connected to the compensation pin (which is the error amplifier's output) to ensure accuracy in measuring AVOL. In
actual applications, this pin's load resistance should be ≥10 MΩ, resulting in AVOL that is typically twice the ensured minimum limit.
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