LM2574-12YN Micrel Inc, LM2574-12YN Datasheet - Page 4
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LM2574-12YN
Manufacturer Part Number
LM2574-12YN
Description
0.5A Step-Down SMPS Regulator ( )
Manufacturer
Micrel Inc
Type
Step-Down (Buck)r
Datasheet
1.LM2574-5.0YN.pdf
(8 pages)
Specifications of LM2574-12YN
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
12V
Current - Output
500mA
Frequency - Switching
52kHz
Voltage - Input
4.75 ~ 40 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2574-12YN
Manufacturer:
MicrelInc
Quantity:
2 000
LM2574
Electrical Characteristics
Symbol
Device Parameters, Adjustable Regulator
I
Device Parameters, Fixed and Adjustable Regulators
f
V
DC
I
I
I
I
θ
On/Off Control, Fixed and Adjustable Regulators Test Circuit Figures 2, 3
V
V
I
I
Notes:
4. Output (pin 2) sourcing current. No diode, inductor, or capacitor connected to input.
5. Feedback (pin 4) removed from output and connected to 0V.
6. Feedback (pin 4) removed from output and connected to 12V to force the output transistor OFF.
7. Junction-to-ambient thermal resistance with approximately 1 square inches of PC board copper surrounding the leads.
Test Circuit
M9999-072805
B
o
CL
L
Q
STBY
IH
IL
JA
SAT
IH
IL
Parameter
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
Output Leakage Current
Quiescent Current
Standby Quiescent Current
Thermal Resistance
ON/OFF Input Level
ON/OFF Input Level
ON/OFF Logic Current
ON/OFF Logic Current
22µF
C
IN
22µF
C
IN
Figure 2. Adjustable Regulator Test Circuit
V
PWR
GND
IN
Figure 3. Fixed Regulator Test Circuit
(adjustable)
LM2574
GND
SI G
P W R
V
GND
IN
Condition
V
Note 8
I
Note 5
Peak Current, t
V
Note 6, Output = –1V
Note 6
ON/OFF Pin = 5V (OFF)
N Package, Junction to Ambient
V
V
ON/OFF = 5V (OFF)
ON/OFF = 0V (ON)
OUT
OUT
IN
OUT
OUT
LM2574–
3.3, 5, 12
OUT
, Note 6, Output = 0V
OFF
ON/
FB
GND
S I G
= 0.5A
= 5V
= 0V
= 5V
OUT
O F F
ON/
F B
(4)
4
11DQ06
ON
330µH
≤ 3µs
11DQ06
330µH
(4)
C
220µF
OU T
C
220µF
(7)
OU T
3.09k
1k
0.65
Min
0.7
2.2
2.4
47
42
93
0.01
Typ
0.8
1.0
7.5
1.4
1.2
50
52
98
50
85
5
4
Max
100
500
200
1.2
1.4
1.6
1.8
1.0
0.8
58
63
30
10
30
10
2
Micrel, Inc.
July 2005
Units
°C/W
kHz
kHz
mA
mA
µA
µA
µA
nA
nA
%
V
V
V
V
V
V
A