L6920DCTR 데이터 시트보기 (PDF) - STMicroelectronics

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L6920DCTR

Synchronous rectifier step up converter

STMicroelectronics 

L6920DC

1

Pin settings

1.1

Pin connection

Figure 1. Pin connection (top view)

Pin settings

1.2

Pin description

Table 1. Pin description

N°

Type

Description

1

FB

Output voltage selector. Connect FB to GND for Vout=5V or to OUT for

Vout=3.3V. Connect FB to an external resistor divider for adjustable

output voltage

2

LBI

Battery low voltage detector input. The internal threshold is set to 1.23V.

A resistor divider is needed to adjust the desired low battery threshold.

3

LBO

Battery low voltage detector output. If the voltage at the LBI pin drops

below the internal threshold typ. 1.23V, LBO goes low.

The LBO is an open drain output and so a pull-up resistor (about

200KΩ) has to be added for correct output setting .

4

REF

1.23V reference voltage. Bypass this output to GND with a 100nF

capacitor for filtering high frequency noise. No capacitor is required for

stability

5

SHDN

Shutdown pin. When pin 5 is below 0.2V the device is in shutdown,

when pin 5 is above 0.6V the device is operating.

6

GND

Ground pin

7

LX

Step-up inductor connection

8

OUT

Power OUTPUT pin

3/16

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