LM2574N-3.3G ON Semiconductor, LM2574N-3.3G Datasheet - Page 21

• Manufacturer Part Number: LM2574N-3.3G
• Description: IC REG SW 0.5A 3.3V OUTPUT 8-DIP
• Manufacturer: ON Semiconductor
• Type: Step-Down (Buck)r

Specifications of LM2574N-3.3G

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V
• Current - Output: 500mA
• Frequency - Switching: 52kHz
• Voltage - Input: 4.75 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Output Voltage: 3.3 V
• Output Current: 0.5 A
• Input Voltage: 4.75 V to 40 V
• Switching Frequency: 52 KHz
• Operating Temperature Range: - 40 C to + 125 C
• Mounting Style: Through Hole
• Duty Cycle (max): 98 %
• Current, Input Bias: 25 nA
• Current, Output: 0.5 A
• Current, Supply: 5 mA
• Frequency, Oscillator: 52 kHz
• Package Type: PDIP-8
• Regulator Type: Switching
• Resistance, Thermal, Junction To Case: 5 °C/W
• Temperature, Operating, Range: -40 to +125 °C
• Voltage, Output: 3.3 V
• Voltage, Supply: 40 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: LM2574N-3.3G; LM2574N-3.3GOS

NOTE: This picture does not show the complete circuit (see Figure 27).
1N5242
40 V Max
Unregulated
DC Input
+V
Figure 34. Undervoltage Lockout Circuit for
15 k
15 k
R2
Z1
R1
in
22 mF
C
in
68 k
R3
+V
Buck−Boost Converter
in
5
Q1
2N3904
Figure 35. 1.2 to 35 V Adjustable 500 mA Power Supply with Low Output Ripple
4
(12)
Pwr
Gnd
LM2574−ADJ
(6)
C
22 mF
+V
in
2
in
5
Sig
Gnd
(4)
(12)
3
LM2574−XX
3
ON/OFF
(14)
(5)
(3)
ON/OFF
(5)
7
1
Output
Feedback
and
2
4
Gnds
Pins
LM2574, NCV2574
−V
http://onsemi.com
D1
1N5819
and
(4)
(6)
out
150 mH
L1
21
Adjustable Output, Low−Ripple Power Supply
features an adjustable output voltage is shown in Figure 35.
input voltage ranges from roughly 3.0 to 40 V. In order to
achieve a 10 or more times reduction of output ripple, an
additional L−C filter is included in this circuit.
C
1000 mF
A 0.5 A output current capability power supply that
This regulator delivers 0.5 A into 1.2 to 35 V output. The
out
R2
50 k
R1
1.1 k
Optional Output
Ripple Filter
20 mH
100 mF
L2
C1
1.2 to 35 V @ 0.5 A
Voltage
Output