LM2574-5.0BWM MICREL [Micrel Semiconductor], LM2574-5.0BWM Datasheet - Page 4

• Manufacturer Part Number: LM2574-5.0BWM
• Description: 52kHz Simple 0.5A Buck Regulator
• Manufacturer: MICREL [Micrel Semiconductor]

LM2574
Electrical Characteristics
Symbol
Device Parameters, Adjustable Regulator
I
Device Parameters, Fixed and Adjustable Regulators
f
V
DC
I
I
I
I
On/Off Control, Fixed and Adjustable Regulators Test Circuit
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
M9999-122303
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
22 F
C
Figure 2. Adjustable Regulator Test Circuit
IN
Figure 3. Fixed Regulator Test Circuit
V
PWR
GND
IN
(adjustable)
LM2574
V
PWR
GND
GND
SIG
IN
ON/OFF Pin = 5V (OFF)
N Package, Junction to Ambient
Condition
V
Note 8
I
Note 5
Peak Current, t
V
Note 6, Output = –1V
Note 6
V
V
ON/OFF = 5V (OFF)
ON/OFF = 0V (ON)
OUT
OUT
IN
OUT
OUT
LM2574–
3.3, 5
, Note 6, Output = 0V
OUT
OFF
GND
ON/
SIG
= 0.5A
FB
= 5V
= 0V
= 5V
OFF
ON/
OUT
Figures 2, 3
(4)
FB
4
11DQ06
330µH
ON
11DQ06
3 s
330 H
(4)
C
220µF
OUT
C
220 F
(7)
OUT
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
December 2003
Max
100
500
200
1.2
1.4
1.6
1.8
1.0
0.8
58
63
30
10
30
10
2
Micrel
Units
kHz
kHz
mA
mA
C/W
nA
nA
%
V
V
A
V
V
V
V
A
A
A