Example Circuits (Continued)
20150934
@
FIGURE 19. 12V to 3.3V 4A, fSW = 300kHz
PART
PART NUMBER
TYPE
PACKAGE
DESCRIPTION
VENDOR
NSC
U1
LM2747
Synchronous
Controller
TSSOP-14
@
Q1
FDS6898A
Dual N-MOSFET
SO-8
20V, 10 mΩ 4.5V, 16 Fairchild
nC
D1
L1
MBR0520LTI
DO3316P-332
16SP100M
Schottky Diode
Inductor
SOD-123
10mm x 6mm
10mm x 6mm
1206
3.3 µH, 5.4Arms 15 mΩ Coilcraft
C
IN1
Aluminum
Electrolytic
Aluminum
Electrolytic
Capacitor
100 µF, 16V, 2.89Arms Sanyo
CO1
6SP220M
220 µF, 6.3V 3.1Arms
0.1 µF, 10%
Sanyo
Vishay
CCC, CBOOT, VJ1206Y104KXXA
CIN2, CO2
CC3
VJ0805Y222KXXA
VJ0805A123KXAA
VJ0805Y332KXXA
VJ0805A820KXAA
CRCW08051002F
CRCW08052211F
CRCW08051003F
CRCW08052611F
CRCW08054121F
CRCW080510R0F
CRCW08051272F
CRCW08051003J
VJ0805A560KXAA
Capacitor
Capacitor
Capacitor
Capacitor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
2200 pF, 10%
12 nF, 10%
3300 pF 10%
82 pF, 10%
10.0 kΩ 1%
2.21 kΩ 1%
100 kΩ 1%
2.61 kΩ 1%
4.12 kΩ 1%
10.0Ω 1%
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
CSS
CC2
CC1
RFB2
RFB1
RFADJ
RC2
RCS
RCC
RC1
12.7kΩ 1%
100 kΩ 5%
56 pF, 10%
RPULL-UP
CCLK
www.national.com
22
NSC [ National Semiconductor ]
