L6910G View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6910G' PDF : 26 Pages View PDF
L6910G
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: 2.5µH Magnetic 77121A7 Core 7T 2x AWG16
In these conditions, the following performance have been achieved:
Table 8.
VIN (V)
5
5
5
5
5
VOUT (V)
1.2
1.5
1.8
2.5
3.3
IOUT (A)
20
20
20
20
20
η (%)
81
83
85
89
91
VIN (V)
12
12
12
12
12
12
VOUT (V)
1.2
1.5
1.8
2.5
3.3
5
IOUT (A)
20
20
20
20
20
20
η (%)
80
83
85
88
91
93
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 6A DEMO BOARD DESCRIPTION
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 VCC and VIN. They can be connected together by shorting the jumper J1.
The PGOOD signal is used as a logic level and it's been pulled up to VIN because there's no other appropriate
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
VIN
GNDIN
VCC
GNDCC
J1
R7
C7
D1
C6
BOOT
OCSET
R6
12
VCC
15
3
11
UGATE
R8
C5
10
PHASE
GND
7
U1
LGATE
14
SS
L6910 4
PGND
13
Q1/Q1
R9
Q2/Q1 D2
C9
OSC
2
9
PGOOD
EAREF
8
C8
VREF
1
5
6
COMP
VFB
R10
R3
C19 R5
R4
C20
C18
C1- C2
L1
R11
C10
C3-4
VOUT
R2
GNDOUT
PWRGD
R1
15/26
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