L6910 STMicroelectronics, L6910 Datasheet - Page 24

• Manufacturer Part Number: L6910
• Description: IC PWM BUCK BST VM 16SOIC
• Manufacturer: STMicroelectronics

Specifications of L6910

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 230kHz
• Duty Cycle: 100%
• Voltage - Supply: 5 V ~ 12 V
• Buck: Yes
• Boost: Yes
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 16-SOIC (3.9mm Width)
• Frequency-max: 230kHz
• Output Voltage: 4 V
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3656-5; 497-4220-5; 497-4220-5

L6910 - L6910A
11 APPLICATION IDEA 3: BUCK-BOOST REGULATOR 3V TO 5.5V INPUT/-5V
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 V
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
Table 14. Part List
24/29
C12,C4,C5,C8
Reference
C13,C14
GND
GND
GND
C1,C2
3A OUTPUT
VIN (3V to 5.5V )
VIN (3V to 5.5V )
VIN (3V to 5.5V )
R1
R2
R3
R4
R5
R6
R7
C3
C6
C7
I
I
I
N
N
N
=
=
=
GNDOUT
GNDOUT
GNDOUT
VCC (5V)
VCC (5V)
VCC (5V)
GNDCC
GNDCC
GNDCC
C6
C6
C6
C8
C8
C8
C8
G1
G1
G1
R7
R7
R7
910 Ohm 5% 125mW
10 Ohm 5% 125mW
1K Ohm 5% 125mW
C7
C7
C7
C7
4.7K 5% 125mW
2.7K 5% 125mW
10K 5% 125mW
1K 5% 125mW
330 F - 6.3V
C5
C5
C5
Description
100 F - 20V
4.7 F - 16V
EAREF
EAREF
EAREF
GND
GND
GND
VCC
VCC
VCC
OSC
OSC
OSC
SS
SS
SS
D1
D1
D1
100nF
100nF
1nF
7
7
7
4
4
4
2
2
2
8
8
8
15
15
15
12
12
12
L6910/A
L6910/A
L6910/A
5
5
5
BOOT
BOOT
BOOT
C9
C9
C9
U1
U1
U1
C10
C10
C10
R1
R1
R1
3
3
3
R5
R5
R5
R6
R6
R6
OCSET
OCSET
OCSET
6
6
6
11
11
11
10
10
10
14
14
14
13
13
13
C3
C3
C3
9
9
9
1
1
1
VREF
VREF
VREF
UGATE
UGATE
UGATE
PHASE
PHASE
PHASE
LGATE
LGATE
LGATE
PGND
PGND
PGND
PGOOD
PGOOD
PGOOD
C4
C4
C4
C12
C12
C12
C12
R4
R4
R4
POSCAP 6TPB330M
Q1
Q1
Q1
R3
R3
R3
OSCON 20SA100M
Q2
Q2
Q2
C11
C11
C11
Manufacturer
NEOHM
NEOHM
NEOHM
NEOHM
NEOHM
NEOHM
NEOHM
KEMET
KEMET
KEMET
AUX
D2
D2
D2
L1
L1
L1
C1- C2
C1- C2
C1- C2
C1- C2
IN
-
-
-
and V
C13
C13
C13
RADIAL 10X10.5
14
14
14
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD7343
SMD0805
SMD0805
SMA6032
OUT
VOUT (-5V 3A)
VOUT (-5V 3A)
VOUT (-5V 3A)
. So, con-
GNDOUT
GNDOUT
GNDOUT
GNDOUT