L4973D3.3 STMicroelectronics, L4973D3.3 Datasheet - Page 7

• 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

L4973
Table 4.
Soft-start
Inhibit
DC characteristics
Error amplifier
Oscillator section
Symbol
Soft-start charge current
Soft-start discharge
current
High level voltage
Low level voltage
I
I
Total operating
quiescent current
Quiescent current
Total stand-by quiescent
current
High level output voltage
Low level output voltage
Source bias current
Source output current
Sink output current
Supply voltage ripple
rejection
DC open loop gain
Transconductance
Ramp valley
Ramp peak
Maximum duty cycle
source
source
Electrical characteristics (continued)
(Refer to the test circuit,V
R
OSC
high level
low level
Parameter
= 20 kΩ; unless otherwise specified)
V
V
Duty cycle = 50 %
V
V
V
C
current
R
I
V
V
V
Duty cycle = 0
comp
INH
INH
CC
CC
COMP
comp
CC
CC
REF
L
= ∞
= 24 V; V
= 55 V; V
= 8 V
= 55 V
= 3 V
= 0.8 V
= -0.1 to 0.1 mA;
= 4.7 μF 1-5 mA load
= 6 V
= VFB
CC
Test condition
= 24 V; T
INH
INH
= 5 V
= 5 V
J
= 25 °C, C
(2)
(2)
(2)
(2)
Electrical characteristics
OSC
11.0
0.78
Min
200
200
3.0
1.9
30
15
10
10
60
50
95
1
9
= 2.7 nF;
0.85
Typ
100
150
300
300
2.7
2.5
2.1
9.6
45
22
16
15
80
60
97
4
2
Max
0.65
0.92
10.2
200
300
600
0.8
2.3
60
30
50
50
6
4
3
Unit
mA
mS
mA
μA
μA
μA
μA
μA
μA
μA
μA
μA
dB
dB
%
V
V
V
V
V
V
V
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