Datasheet

1
2
3
4
5
EN
VIN
SW
GND
FB
Pin Description for 5-Pin SOT23 www.ti.com
3 Pin Description for 5-Pin SOT23
Figure 2. Pin-Out
Table 1. Pin Description
Pin Name Function
1 SW Output switch. Connect to the inductor, output diode.
2 GND Signal and power ground pin. Place the bottom resistor of the feedback network as close as
possible to this pin.
3 FB Feedback pin. Connect FB to external resistor divider to set output voltage.
4 EN Shutdown control input. Logic high enables operation. Do not allow this pin to float or be
greater than VIN + 0.3V.
5 VIN Supply voltage for power stage, and Input supply voltage.
4 Bill of Materials
Table 2. Bill of Materials
Part ID Part Value Manufacturer Part Number
U1 2.1A Boost Regulator Texas Instruments LM2735
C1, Input Cap 22µF, 6.3V, X5R TDK C2012X5R0J226M
C2 Output Cap 10µF, 25V, X5R TDK C3216X5R1E106M
C3 Comp Cap 330pF TDK C1608X5R1H331K
D1, Catch Diode 0.4V
f
Schottky 1A, 20V
R
ST STPS120M
L1 6.2µH 3A Coilcraft MSS7341-622
R1 10.2kΩ, 1% Vishay CRCW06031022F
R2 86.6kΩ, 1% Vishay CRCW06038662F
R3 100kΩ, 1% Vishay CRCW06031003F
2
AN-1664 LM2735X 5-Pin SOT23 Demo Board SNVA258B–June 2007–Revised April 2013
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