Datasheet

LM2734
VIN
EN
BOOST
SW
FB
GND
C3
R1
R2
D1
D2
V
OUT
C
FF
12V
V
IN
3.3V
L1
C1
ON
OFF
R3
C2
LM2734
SNVS288I –SEPTEMBER 2004–REVISED APRIIL 2013 www.ti.com
Figure 28. LM2734X (1.6MHz)
V
BOOST
Derived from V
OUT
12V to 3.3V/1A
Table 2. Bill of Materials for Figure 28
Part ID Part Value Part Number Manufacturer
U1 1A Buck Regulator NSC LM2734X
C1, Input Cap 10µF, 25V, X7R C3225X7R1E106M TDK
C2, Output Cap 22µF, 6.3V, X5R C3216X5ROJ226M TDK
C3, Boost Cap 0.01µF, 16V, X7R C1005X7R1C103K TDK
CFF 1000pF 25V C0603X5R1E102K TDK
D1, Catch Diode 0.34V
F
Schottky 1A, 30VR SS1P3L Vishay
D2, Boost Diode 1V
F
@ 50mA Diode 1N4148W Diodes, Inc.
L1 4.7µH, 1.7A VLCF4020T- 4R7N1R2 TDK
R1 31.6kΩ, 1% CRCW06033162F Vishay
R2 10kΩ, 1% CRCW06031002F Vishay
R3 100kΩ, 1% CRCW06031003F Vishay
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