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AN938 Datasheet(PDF) 31 Page - STMicroelectronics

Part # AN938
Description  The L4973 family is a 3.5 A monolithic DC-DC converter
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN938 Datasheet(HTML) 31 Page - STMicroelectronics

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AN938
Applications
Doc ID 5410 Rev 10
31/33
In inverting buck-boost topology the lower voltage rail of the device floats with the negative
output voltage. The voltage applied to the device is equal to (VIN + |VOUT|) whose upper limit
is given by the maximum input voltage range of the device (55 V).
Figure 42.
Negative output voltage
4.6
Negative boost converter
Figure 43 shows how to stabilize a negative output voltage higher than negative input
voltage.
Figure 43.
Negative boost converter.
AM03524v1
L4973
VCC
-Vo
L
2,3
9
ROSC
CIN1
CIN
CBOOT
COUT
R1
R2
COSC
CSS
D
7,8
Rc
Cc
12
11
4,5,6
13,14,15
17
1
VCCMax = 55 -⏐VO⏐
VFB
AM03525v1
L4973
-VCC
VCC
GND
VFB
R1
R2
8V
≤|V
OUT|≤55V
OUT
L
OSC
D
CIN
ROSC
COSC
CBOOT
COUT
2,3
12
7,8
|VCC|<|VOUT|



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