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L6910A View Datasheet(PDF) - STMicroelectronics

Part Name
Description
MFG CO.
'L6910A' PDF : 29 Pages View PDF
L6910 - L6910A
11 APPLICATION IDEA 3: BUCK-BOOST REGULATOR 3V TO 5.5V INPUT/-5V
3A OUTPUT
In applications where a negative output voltage is required, a standard Buck-Boost topology can be implement-
ed. The considerations related to the maximum output current are the same of the "Positive Buck-Boost" (Ap-
plication Idea 2).
A particularity of this topology is that the device undergoes a voltage that is the sum of VIN and VOUT. So, con-
verting 5V to -5V, the device undergoes 10V voltage. It must be checked that the sum of the input and output
voltage is lower than the maximum operating input voltage of the device.
Figure 32. buck-boost regulator 3V to 5.5V input / -5V 3A Output Circuit
VIN (3V to 5.5V )
GNDIN=GNDOUT
VCC (5V)
GNDCC
G1
R1
C3
D1
C4
BOOT
OCSET
R7
VCC
12
15
3
11 UGATE
C6
C5
10 PHASE
GND 7
U1
14 LGATE
SS 4 L6910/A 13 PGND
OSC 2
9 PGOOD
EAREF 8
C7
C8
5
1 VREF
6
C9
R5
C10
Q1
Q2
D2
C12
R3
R4 C11
C1- C2
L1
GNDOUT
C13 14
-
VOUT (-5V 3A)
R6
Table 14. Part List
Reference
R1
R2
R3
R4
R5
R6
R7
C1,C2
C13,C14
C12,C4,C5,C8
C3
C6
C7
24/29
Description
910 Ohm 5% 125mW
10K 5% 125mW
4.7K 5% 125mW
1K Ohm 5% 125mW
2.7K 5% 125mW
1K 5% 125mW
10 Ohm 5% 125mW
100µF - 20V
330µF - 6.3V
100nF
1nF
4.7µF - 16V
100nF
Manufacturer
NEOHM
NEOHM
NEOHM
NEOHM
NEOHM
NEOHM
NEOHM
OSCON 20SA100M
POSCAP 6TPB330M
KEMET
KEMET
AUX
KEMET
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
RADIAL 10X10.5
SMD7343
SMD0805
SMD0805
SMA6032
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