Example Circuits
20150932
@
FIGURE 17. 3.3V to 1.8V 2A, fSW = 300 kHz
PART
PART NUMBER
TYPE
PACKAGE
DESCRIPTION
VENDOR
U1
LM2747
Synchronous
Controller
TSSOP-14
NSC
@
Q1
FDS6898A
Dual N-MOSFET
SO-8
20V, 10 mΩ 4.5V, Fairchild
16nC
D1
L1
MBR0520LTI
DO3316P-472
Schottky Diode
Inductor
SOD-123
4.7 µH, 4.8Arms 18 Coilcraft
mΩ
C
IN1
16SP100M
6SP220M
Aluminum
Electrolytic
Aluminum
Electrolytic
Capacitor
10mm x 6mm
10mm x 6mm
1206
100 µF, 16V,
2.89Arms
Sanyo
Sanyo
Vishay
CO1
220 µF, 6.3V
3.1Arms
CCC, CBOOT, VJ1206Y104KXXA
CIN2, CO2
0.1 µF, 10%
CC3
VJ0805Y332KXXA
VJ0805A123KXAA
VJ0805A821KXAA
VJ0805A220KXAA
CRCW08051002F
CRCW08054991F
CRCW08051003F
CRCW08052101F
CRCW08052101F
CRCW080510R0F
CRCW08055492F
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
3300 pF, 10%
12 nF, 10%
820 pF 10%
22 pF, 10%
10.0 kΩ 1%
4.99 kΩ1%
100 kΩ 1%
2.1 kΩ 1%
2.1 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
54.9 kΩ 1%
100 kΩ 5%
56 pF, 10%
RPULL-UP
CCLK
www.national.com
20
NSC [ National Semiconductor ]
