L4973D3.3 STMicroelectronics, L4973D3.3 Datasheet - Page 20

• Manufacturer Part Number: L4973D3.3
• Description: IC BUCK SYNC 3.3/ADJ 3.5A SOIC20
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4973D3.3

• 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: 50 V
• Mounting Style: SMD/SMT
• For Use With: 497-4743 - BOARD EVAL FOR L4973X SW REG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical characteristics
20/28
Figure 37. Source current rise and fall
Figure 39. Soft-start capacitor selection
Lomax
(μH)
150
100
50
0
15
20
time, pin 2, 3 (see
vs. inductor and V
AN938)
f
sw
= 200KHz
25
30
35
40
45
CC
Figure
D97IN654
50
max (ref.
Vi(V)
4)
Figure 38. Soft-start capacitor selection
Figure 40. Open loop frequency and
GAIN
-100
-150
-200
(dB)
-50
50
0
Lomax
(μH)
300
250
200
150
100
50
10
0
25
10
2
30
vs. inductor and V
AN938)
phase of error amplifier
10
f
3
sw
= 100KHz
10
35
4
10
5
40
10
6
Css=1μF
Phase
GAIN
45
10
7
CC
10
Css=220nF
Css=470nF
D97IN663
Css=100nF
Css=820nF
50
Css=680nF
8
D97IN653
max (ref.
f(Hz)
Vi(V)
Phase
135
L4973
45
90
0