L6910 STMicroelectronics, L6910 Datasheet - Page 15

• 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

6.5 APPLICATION SUGGESTIONS FOR HIGHER CURRENTS
For higher output currents, up to 20A, the following configuration can be used (with reference to the demo board
schematic):
Q1,Q2,Q3: STS11NF30L
Q4,Q5,Q6: STS17NF3LL
L: 2.5 H Magnetic 77121A7 Core 7T 2x AWG16
In these conditions, the following performance have been achieved:
Table 8.
For currents higher than 20A, bigger mosfets should be selected (e.g. STS25NH3LL) both for the high side and
low side (depending on the duty cycle and input voltage).
7
A compact demo board has been realized to manage currents in the range of 5A-6A .
The external power mosfets are included in a single SO8 package to save space and increase power density.
Two separate rails are provided, for V
The PGOOD signal is used as a logic level and it's been pulled up to V
voltage available on the demo board. In case of input voltage higher than 7V (PGOOD Pin Maximum Ab-
solute Rating) a 5V reference is required.
Figure 17. 6A Demo Board Schematic
GNDCC
GNDCC
GNDIN
GNDIN
GNDIN
V
VCC
VCC
VIN
VIN
IN
6A DEMO BOARD DESCRIPTION
5
5
5
5
5
(V)
V
OUT
1.2
1.5
1.8
2.5
3.3
(V)
C9
C9
C9
C8
C8
J1
J1
R6
R6
R10
R10
I
OUT
20
20
20
20
20
C5
C5
(A)
EAREF
EAREF
D1
D1
VCC
VCC
GND
GND
OSC
OSC
SS
SS
CC
COMP
COMP
15
15
7
7
4
4
2
2
8
8
and V
12
12
5
5
L6910
L6910
BOOT
BOOT
C19
C19
U1
U1
81
83
85
89
91
(%)
C18
C18
R7
R7
IN
3
3
R5
R5
. They can be connected together by shorting the jumper J1.
R1
R1
OCSET
OCSET
6
6
VFB
VFB
11
11
10
10
14
14
13
13
C7
C7
9
9
1
1
VREF
VREF
PGND
PGND
PHASE
PHASE
UGATE
UGATE
LGATE
LGATE
PGOOD
PGOOD
C6
C6
V
IN
12
12
12
12
12
12
R8
R8
R9
R9
(V)
R4
R4
R4
Q1/Q1
Q1/Q1
Q2/Q1
Q2/Q1
R3
R3
IN
C20
C20
C20
V
because there's no other appropriate
D2
D2
OUT
1.2
1.5
1.8
2.5
3.3
5
(V)
R11
R11
C10
C10
L1
L1
I
OUT
C3-4
C3-4
20
20
20
20
20
20
C1- C2
C1- C2
L6910 - L6910A
(A)
R2
R2
VOUT
VOUT
GNDOUT
GNDOUT
PWRGD
PWRGD
80
83
85
88
91
93
(%)
15/29