L6920

2/13

Table 1. Pin Description

Figure 2. Pin Connection (Top view)

Table 2. Absolute Maximum Ratings

Table 3. Thermal Data

Pin

Name

Function

1FB

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 (from 2V to 5.2V) [see R4 and R5, fig. 7].

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:

[see R1 and R2, fig. 7]

3

LBO

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

threshold typ. 1.23V,

The

Ω) has to be added for

correct output setting [see R3, fig. 7].

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

Symbol

Parameter

Value

Unit

6

V

LBI, SHDN, FB to GND

6

V

Vout to GND

6

V

Symbol

Parameter

Value

Unit

Thermal Resistance Junction to Ambient

250

°C/W

Maximum Junction Temperature

150

°C

V

LBI

1.23V

=

1

R1

R2

--------

+

⎝⎠

⎛⎞

⋅

FB

LBI

REF

GND

LX

OUT

1

3

2

4

6

5

7

8

TSSOP8

LBO

SHDN