LM2577T-ADJ/NOPB National Semiconductor, LM2577T-ADJ/NOPB Datasheet - Page 5
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LM2577T-ADJ/NOPB
Manufacturer Part Number
LM2577T-ADJ/NOPB
Description
IC REG SIMPLE SWITCHER TO-220-5
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Up (Boost), Flyback, Forward Converterr
Specifications of LM2577T-ADJ/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
11.4 ~ 12.6 V
Current - Output
3A
Frequency - Switching
52kHz
Voltage - Input
3.5 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Straight Leads)
Current, Input Bias
100 nA
Current, Output
3 A
Current, Supply
25 mA
Frequency, Oscillator
52 kHz
Package Type
TO-220
Regulation, Line
20 mV
Regulation, Load
20 mV
Regulator Type
Boost (Step-Up)
Resistance, Thermal, Junction To Case
2 °C/W
Temperature, Operating, Range
-40 to +125 °C
Transconductance
3700
Voltage, Gain
800 V/V
Voltage, Input
3.5 to 40 V
Dc To Dc Converter Type
Step Up
Pin Count
5 +Tab
Input Voltage
40V
Output Voltage
11.6 to 12.4V
Switching Freq
48 TO 56KHz
Output Current
3A
Efficiency
80%
Output Type
Adjustable
Switching Regulator
Yes
Load Regulation
50mV
Line Regulation
50mV
Mounting
Through Hole
Input Voltage (min)
3.5V
Operating Temperature Classification
Automotive
For Use With
551011367-061 - BOARD WEBENCH LM2577,LM2585/87
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Other names
*LM2577T-ADJ
*LM2577T-ADJ/NOPB
LM2577T-ADJ
*LM2577T-ADJ/NOPB
LM2577T-ADJ
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2577T-ADJ/NOPB
Manufacturer:
TOSHIBA
Quantity:
7 600
DEVICE PARAMETERS
I
D
∆I
∆V
I
V
THERMAL PARAMETERS (All Versions)
θ
θ
θ
θ
θ
θ
θ
SS
L
JA
JC
JA
JC
JA
JA
JA
SAT
Electrical Characteristics—LM1577-ADJ, LM2577-ADJ
SWITCH
Specifications with standard type face are for T
Range. Unless otherwise specified, V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the device is intended to
be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see the
Electrical Characteristics.
Note 2: Due to timing considerations of the LM1577/LM2577 current limit circuit, output current cannot be internally limited when the LM1577/LM2577 is used as
a step-up regulator. To prevent damage to the switch, its current must be externally limited to 6.0A. However, output current is internally limited when the
LM1577/LM2577 is used as a flyback or forward converter regulator in accordance to the Application Hints.
Note 3: All limits guaranteed 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.
Note 4: 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.
Note 5: All limits guaranteed 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 guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
Note 6: 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.
Note 7: A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier’s output) to ensure accuracy in measuring A
this pin’s load resistance should be ≥10 MΩ, resulting in A
Symbol
COMP
/
Error Amplifier
Output Swing
Error Amp
Output Current
Soft Start Current
Maximum Duty Cycle
Switch
Transconductance
Switch Leakage
Current
Switch Saturation
Voltage
NPN Switch
Current Limit
Thermal Resistance
Parameter
Upper Limit
V
Lower Limit
V
V
V
V
V
V
I
V
V
I
V
V
K Package, Junction to Ambient
K Package, Junction to Case
T Package, Junction to Ambient
T Package, Junction to Case
N Package, Junction to
Ambient (Note 8)
M Package, Junction
to Ambient (Note 8)
S Package, Junction to
Ambient (Note 9)
IN
SWITCH
SWITCH
FEEDBACK
FEEDBACK
FEEDBACK
COMP
FEEDBACK
COMP
COMP
SWITCH
FEEDBACK
COMP
COMP
= 5V, V
= 1.0V
= 0V
= 1.5V
= 2.0V (Max Duty Cycle)
= 2.0V
= 100 mA
= 2.0A
VOL
= 65V
J
FEEDBACK
= 25˚C, and those in bold type face apply over full Operating Temperature
= 1.0V
= 1.5V
= 1.0V to 1.5V
= 1.0V
= 1.5V (Switch Off)
Conditions
that is typically twice the guaranteed minimum limit.
= V
REF
8
, and I
SWITCH
Typical
±
12.5
100
2.4
0.3
5.0
0.5
4.3
1.5
95
10
35
65
85
37
200
2
= 0.
LM1577-ADJ LM2577-ADJ
(Notes 3, 4)
±
±
0.40/0.55
300/
300/600
2.2/2.0
130/
2.5/1.5
7.5/9.5
0.7/0.9
3.7/3.0
5.3/6.0
93/90
Limit
(Continued)
±
±
400
90
±
±
0.40/0.55
(Note 5)
300/
300/600
2.2/2.0
130/
2.5/1.5
7.5/9.5
0.7/0.9
3.7/3.0
5.3/6.0
93/90
Limit
VOL
±
±
. In actual applications,
400
90
µA(max)
µA(max)
µA(max)
(Limits)
µA(min)
µA(min)
V(max)
V(max)
A(max)
%(min)
V(min)
A(min)
Units
˚C/W
A/V
µA
µA
µA
%
V
V
V
A