LM27313

SW

FB

GND

SHDN

U1

R3

51k

SHDN

GND

C1

2.2 2F

R2

13.3k

CF

220 pF

D1

MBR0520

R1/117k

L1/10 2H

C2

4.7 2F

12V

OUT

260 mA

(TYP)

LM27313, LM27313-Q1

SNVS487E – DECEMBER 2006 – REVISED JANUARY 2015

www.ti.com

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The device operates with input voltage in the range of 2.7 V to 14 V and provides regulated output voltage. This

device is optimized for high-efficiency operation with minimum number of external components. Also, high

switching frequency allows use of small surface mount components, enabling very small solution size. For

component selection, refer to Detailed Design Procedure.

8.2 Typical Applications

Figure 12. Typical Application Circuit

Figure 13. Efficiency vs. Load Current

8.2.1.1 Design Requirements

The device must be able to operate at any voltage within input voltage range.

Load Current must be defined in order to properly size the inductor, input and output capacitors. The inductor

should be able to handle full expected load current as well as the peak current generated during load transients

and start up. Inrush current at startup will depend on the output capacitor selection. More details are provided in

Detailed Design Procedure.

Device has a shutdown pin (SHDN) that is used to enable and disable device. This pin is active low and should

be tied to VIN if not used in application.

10

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