VIN

SW

FB

EN

GND

L1: 2.2 PH

10 PF

4.7 PF

LM3671TL-1.8

VBATT

3 V to 5.5 V

IN

OUT

GND

Load

0 to 350 mA

BATT

LP5952

1.5 V

EN

2.2 PF

A1

B2

C3

A3

C1

1.8 V

VOUTDCDC

A1

A3

C1

C3

B2

LP5952

www.ti.com

SNVS469F – OCTOBER 2006 – REVISED DECEMBER 2015

8.2.2 Additional Application Circuit

Figure 18. Typical Application Circuit With DC-DC Converter as Pre-Regulator for VIN

9 Power Supply Recommendations

This device is designed to operate from an input supply voltage range of 0.7 V to 4.5 V. The input supply should

be well regulated and free of spurious noise. A minimum capacitor value of 1-

μF is required to be within 1 cm of

the IN pin. The VBATT range is 2.5 V to 5.5 V and, in the typical application, VBATT is connected to batteries. In

any application, VIN does not exceed VBATT.

Copyright © 2006–2015, Texas Instruments Incorporated

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