L4973D3.3-013TR STMicroelectronics, L4973D3.3-013TR Datasheet - Page 9

• Manufacturer Part Number: L4973D3.3-013TR
• Description: IC REG SW STEP DOWN 3.5A 20-SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4973D3.3-013TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 0.5 ~ 50 V
• Current - Output: 3.5A
• Frequency - Switching: 100kHz ~ 300kHz
• Voltage - Input: 8 ~ 55 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Power - Output: 4W
• Output Voltage: 5.1 V
• Output Current: 3.5 A
• Input Voltage: 8 V to 55 V
• Switching Frequency: 90 KHz to 110 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 97 %
• For Use With: 497-4743 - BOARD EVAL FOR L4973X SW REG
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3358-2

L4973
5
Evaluation board
Figure 4.
Table 5.
470u 63v
470u 63v
SYNCH
SYNCH
Reference
Vin
Vin
GND
GND
C10
C10
C10
R1
R2
R3
R4
R5
R6
R7
C1
C2
C3
C4
C5
C6
C7
C8
C9
2.7n
2.7n
C1
C1
R1
R1
15k
15k
220n
220n
C9
C9
Evaluation board circuit
Component list (fsw = 150 kHz, V
470n
470n
C2
C2
NM
NM
C3
C3
C3A
C3A
Capacitor 470 μF 63V
1u
1u
Capacitor 470 nF 5%
Capacitor 150 pF 5%
Capacitor 220 nF 5%
Capacitor 220 nF 5%
Resistor 4.99 kΩ 1%
Capacitor 2.7 nF 5%
Capacitor 22 nF 5%
Resistor 2.7 kΩ 1%
Resistor 15 kΩ 1%
Resistor 15 kΩ 1%
Capacitor 1 μF 5%
17
16
1
L4973 DIP 18
L4973 DIP 18
OSC
SS
V5.1
Not mounted
Not mounted
Not mounted
Not mounted
Not mounted
U1
U1
Description
R5
R5
NM
NM
3
JP1
JP1
C4
C4
22n
22n
R2
R2
15k
15k
2
C5
C5
150p
150p
1
C8
C8
R6 NM
R6 NM
signal GND
GND plane
GND
GND
GND
GND
GND
GND
OUT
OUT
220n
220n
2
3
15
14
13
6
5
4
EKY-630ELL471ML20S
OUT
Part number
NM
NM
signal GND
Q2
Q2
= 5 V)
NM
NM
NM
NM
R7
R7
C6
C6
D1
D1
STPS5L60
STPS5L60
L1
L1
68uH
68uH
C7
C7
NM
NM
150u 50v
150u 50v
C11
C11
Nippon Chemi-con
Evaluation board
Manufacturer
150u 50v
150u 50v
C12
C12
NM
NM
C13
C13
R3
R3
2.7k
2.7k
R4
R4
4.99k
4.99k
C14
C14
NM
NM
Vout
Vout
GND
GND
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