LM2735XMFSLASHNOPB datasheet(14/59 Pages) TI

14 / 59 page

GND

Vin

12V

LOAD

VIN

LM2735, LM2735-Q1

SNVS485G – JUNE 2007 – REVISED AUGUST 2015

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7.4 Device Functional Modes

7.4.1 Enable Pin and Shutdown Mode

The LM2735 has a shutdown mode that is controlled by the Enable pin (EN). When a logic low voltage is applied

to EN, the part is in shutdown mode and its quiescent current drops to typically 80 nA. Switch leakage adds up to

another 1 µA from the input supply. The voltage at this pin should never exceed VIN + 0.3 V.

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 will operate with input voltage in the range of 2.7 V to 5.5 V and provide regulated output voltage.

This device is optimized for high-efficiency operation with minimum number of external components. For

component selection, see Detailed Design Procedure.

8.2 Typical Applications

8.2.1 LM2735X SOT-23 Design Example 1

Figure 18. LM2735X (1.6 MHz): VIN = 5 V, VOUT = 12 V @ 350 mA

8.2.1.1 Design Requirements

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

The load current needs to be defined in order to properly size the inductor, input capacitor, and output capacitor.

The inductor must be able to handle full expected load current as well as the peak current generated during load

transients and start-up. The inrush current at startup will depend on the output capacitor selection. More details

are provided in Detailed Design Procedure.

The device has an enable pin (EN) that is used to enable and disable the device. This pin is active high and care

should be taken that voltage on this pin does not exceed VIN + 0.3 V.

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Product Folder Links: LM2735 LM2735-Q1

LM2735XMF/NOPB Datasheet(PDF) 14 Page - Texas Instruments