Datasheet

LM2738
V
IN
V
IN
EN
BOOST
SW
FB
GND
V
OUT
C3
L1
C2
R1
R2
D1
D2
ON
OFF
D3
C4
R4
C1
R3
LM2738
SNVS556B –APRIL 2008–REVISED APRIL 2013 www.ti.com
LM2738Y Circuit Example 8
Figure 43. LM2738Y (550kHz)
V
BOOST
Derived from V
SHUNT
18V to 1.5V/1.5A
Table 9. Bill of Materials for Figure 43
Part ID Part Value Part Number Manufacturer
U1 1.5A Buck Regulator LM2738Y Texas Instruments
C1, Input Cap 10µF, 25V, X7R C3225X7R1E106M TDK
C2, Output Cap (47µF, 6.3V, X5R) x 2 = 94µF C3216X5ROJ476M TDK
C3, Boost Cap 0.1µF, 16V, X7R C1005X7R1C104K TDK
C4, Shunt Cap 0.1µF, 6.3V, X5R C1005X5R0J104K TDK
D1, Catch Diode 0.34V
F
Schottky 1.5A, 30V CRS08 Toshiba
D2, Boost Diode 1V
F
@ 100mA Diode BAT54WS Diodes, Inc.
D3, Zener Diode 5.1V 250Mw SOT-23 BZX84C5V1 Vishay
L1 8.7µH, 2.2A MSS7341-872NL Coilcraft
R1 8.87kΩ, 1% CRCW06038871F Vishay
R2 10.2kΩ, 1% CRCW06031022F Vishay
R3 100kΩ, 1% CRCW06031003F Vishay
R4 4.12kΩ, 1% CRCW06034121F Vishay
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