E-L6920D Datasheet, PDF (2/13 Pages) STMicroelectronics – 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER

L6920
Table 1. Pin Description
Pin
Name
Function
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 (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:
V_LBI
=
1.23 V
⋅
⎛
⎝
1
+
RR_-----12_{--⎠⎞}
[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, 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 [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
Figure 2. Pin Connection (Top view)
FB
LBI
LBO
REF
1
8
2
7
3
6
4
5
TSSOP8
OUT
LX
GND
SHDN
Table 2. Absolute Maximum Ratings
Symbol
Parameter
V_ccmax V_cc to GND
LBI, SHDN, FB to GND
V_{out max} Vout to GND
Value
Unit
6
V
6
V
6
V
Table 3. Thermal Data
Symbol
Parameter
R_{th j-amb} Thermal Resistance Junction to Ambient
T_j
Maximum Junction Temperature
2/13
Value
250
150
Unit
°C/W
°C