Datasheet

LM1577, LM2577
www.ti.com SNOS658D –JUNE 1999–REVISED APRIL 2013
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, V
FEEDBACK
= V
REF
, and I
SWITCH
= 0.
Symbol Parameter Conditions Typical LM1577-ADJ LM2577-ADJ Units
Limit
(1)(2)
Limit
(3)
(Limits)
SYSTEM PARAMETERS Circuit of Figure 31
(4)
V
OUT
Output Voltage V
IN
= 5V to 10V 12.0 V
I
LOAD
= 100 mA to 800 mA
(1)
11.60/11.40 11.60/11.40 V(min)
12.40/12.60 12.40/12.60 V(max)
ΔV
OUT
/ΔV
IN
Line Regulation V
IN
= 3.5V to 10V 20 mV
I
LOAD
= 300 mA
50/100 50/100 mV(max)
ΔV
OUT
/ΔI
LOA
Load Regulation V
IN
= 5V 20 mV
D
I
LOAD
= 100 mA to 800 mA
50/100 50/100 mV(max)
η Efficiency V
IN
= 5V, I
LOAD
= 800 mA 80 %
DEVICE PARAMETERS
I
S
Input Supply Current V
FEEDBACK
= 1.5V (Switch Off) 7.5 mA
10.0/14.0 10.0/14.0 mA(max)
I
SWITCH
= 2.0A 25 mA
V
COMP
= 2.0V (Max Duty Cycle)
50/85 50/85 mA(max)
V
UV
Input Supply I
SWITCH
= 100 mA 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)
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
Reference Measured at Feedback Pin V
Voltage V
IN
= 3.5V to 40V
1.230 1.214/1.206 1.214/1.206 V(min)
V
COMP
= 1.0V
1.246/1.254 1.246/1.254 V(max)
ΔV
REF
/ΔV
IN
Reference Voltage V
IN
= 3.5V to 40V 0.5 mV
Line Regulation
I
B
Error Amp V
COMP
= 1.0V 100 nA
Input Bias Current
300/800 300/800 nA(max)
G
M
Error Amp I
COMP
= −30 μA to +30 μA 3700 μmho
Transconductance V
COMP
= 1.0V
2400/1600 2400/1600 μmho(min)
4800/5800 4800/5800 μmho(max)
A
VOL
Error Amp Voltage Gain V
COMP
= 1.1V to 1.9V 800 V/V
R
COMP
= 1.0 MΩ
(5)
500/250 500/250 V/V(min)
Error Amplifier Upper Limit 2.4 V
Output Swing V
FEEDBACK
= 1.0V
2.2/2.0 2.2/2.0 V(min)
Lower Limit 0.3 V
V
FEEDBACK
= 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 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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