SP6127 Datasheet, PDF (9/12 Pages) Sipex Corporation – High-Voltage, Step-Down Controller in TSOT6

_____________________________________ TYPICAL PERFORMANCE CHARACTERISTICS
C7
0.1uF
1
Vin
2
Gate
Rs=1k
LX
Q1
Si2343DS
L1, IHLP-2525CZ
3.3uH, 30mOhm, 6A
6
SP6127
3
VDR
GND
5
4
VFB
Ds
RZ
MBRA340T3G 2K
CZ
33pF
R1
200k, 1%
R2
100k, 1%
SHDN
D1 1N4148
High=Of f
Figure 4- Application circuit
VIN
C1
4.7uF
12V
GND
VOUT
C4
22uF
1.8V
0-2.0A
GND
SP6127 Efficiency versus Iout,
Vin=12V,Ta=25C
90
Vout=1.8V
80
70
60
50
0.0
0.5
1.0
1.5
2.0
Iout (A)
Figure 5- Efficiency, natural convection
1.810
1.805
1.800
1.795
1.790
0.0
SP6127 Load Regulation
Vin=12V
0.5
1.0
1.5
2.0
Iout (A)
Figure 6- Load regulation
Jan28-08 RevE
SP6127 TSOT-6 PFET Buck Controller
Page 9
 2007 Exar Corporation