SP6126 Datasheet, PDF (9/14 Pages) Sipex Corporation – High-Voltage, Step Down Controller in TSOT6

APPLICATION CIRCUITS
C7
0.1uF
VIN
1
Vin
2
Gate
Rs=1k
LX
Q1
Si2343DS
L1, IHLP-2525CZ
6.8uH, 60mOhm, 4.5A
6
SP6126
3
VDR
GND
5
4
VFB
Ds
RZ
MBRA340T3G 2K
CZ
62pF
R1
200k, 1%
R2
44.2k, 1%
SHDN
D1 1N4148
High=Of f
C1
10uF
12V
GND
VOUT
C4
22uF
3.3V
0-2.0A
GND
Figure 4- Application circuit for VIN=12V
VIN
C7
0.1uF
1
Vin
2
Gate
Rs 1k
LX
M1, Si4447DY
72mOhm, 40V
L1, Vishay IHLP-2525CZ
6.8uH, 4.5A, 60mOhm
6
SP6126
3
VDR
Ds, MBRA340T3 RZ
3A, 40V
2K
R1
200k, 1%
GND
4
VFB
CZ
62pF
5
R2
44.2k, 1%
SHDN
D1 1N4148
C1
2.2uF
C2
2.2uF _24-29V
GND
C1, C2 CERAMIC, 50V
VOUT
C4, ceramic
22uF, 6.3V
3.3V
0-2.0A
GND
Nov07-08 RevG
Figure 5- Application circuit for VIN = 24-29V
SP6126: TSOT-6 PFET Buck Controller
9
 2008 Exar Corporation