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L5973AD Datasheet(PDF) 9 Page - STMicroelectronics

Part # L5973AD
Description  2A SWITCH STEP DOWN SWITCHING REGULATOR
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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L5973AD
4.3 ZERO LOAD
Due to the fact that the internal power is a PDMOS, no boostrap capacitor is required and so, the device works prop-
erly also with no load at the output. In this condition it works in burst mode, with random repetition rate of the burst.
4.4 APPLICATION CIRCUIT
In figure 9 is shown the demo board application circuit, where the input supply voltage, Vcc, can range from 4.4V
to 25V due to the rated voltage of the input capacitor and the output voltage is adjustable from 1.235V to Vcc.
Figure 9. Demo board Application Circuit
Table 6. Component List
Reference
Part Number
Description
Manufacturer
C1
10
µF, 25V
TOKIN
C2
POSCAP 6TPB330M
330
µF, 6.3V
Sanyo
C3
C1206C221J5GAC
220pF, 5%, 50V
KEMET
C4
C1206C223K5RAC
22nF, 10%, 50V
KEMET
R1
5.6K, 1%, 0.1W 0603
Neohm
R2
3.3K, 1%, 0.1W 0603
Neohm
R3
4.7K, 1%, 0.1W 0603
Neohm
D1
STPS2L25U
2A, 25V
ST
L1
DO3316P-153
15
µH, 3A
COILCRAFT
D03IN1454
8
4
5
1
7
L5973AD
C1
10
µF
25V
CERAMIC
C2
330
µF
6.3V
VOUT=3.3V
VIN = 4.4V to 25V
R1
5.6K
R2
3.3K
R3
4.7K
C4
22nF
C3
220pF
3
L1 15
µH
D1
STPS2L25U
COMP
VCC
OUT
FB
GND
INH
2
6
3.3V
SYNC.
VREF


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