Datasheet

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1
2
3
4
24
23
22
21
NC
BOOT2
SS
UVLO
BOOT1
OVSET
VOUT
GSNS
5 20BP5DIFFO
6
7
8
CS1
CSRT1
NC
32
31
30
29
28
27
26
25
HDRV1
SW1
VIN5
LDRV1
PGND
LDRV2
SW2
HDRV2
19
18
17
AGND
CS2
CSRT2
9
10
11
12
15
16
COMP
VREF
DROOP
FB
EN/SYNC
ILIM
PGOOD
RT
D2
BAT54A
C7 2200 pF
C4
R17
R18
C8
R11
R12
C10
R19
C5
R6
R7
R1
L2
TPS40130RHB
12 V
5 V
C19 C20
C21
C12 C13
L1
Q6
Q5
Q4
Q3
Q2
D1
BAT54A
C17
C15
Q1
TL431
R2
12 V
VREF
R8
10 kΩ
C19
0.1 µF
R16
10 kΩ
R5
90.9 kΩ
1 Ω
C6
0.1 µF
R22
10 Ω
C2
0.1 µF
1 Ω
V
OUT
V
OUT
R10
10 kΩ
R13
10 kΩ
R21 51 Ω
R22 51 Ω
C1
0.1 µF
10 kΩ
10 kΩ
115 Ω
UDG−05080
R14
10 kΩ
13
14
5 V
EN/SYNC
TPS40130
SLUS602B – JUNE 2004 – REVISED SEPTEMBER 2005
APPLICATION INFORMATION (continued)
Figure 16 shows the required 5-V input being generated with an external linear regulator. The regulator shown is
the TL431 shunt regulator which is a very cost effective solution. Depending on the required current to the
MOSFET gates, the 115 Ω resistor may need to be a ¼ W or ½ W resistor.
Figure 16. Application Circuit with an External Linear Regulator Providing VIN5
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