l6920 STMicroelectronics, l6920 Datasheet - Page 2

• Manufacturer Part Number: l6920
• Description: 1v High Efficiency Syncronous Step Up Converter
• Manufacturer: STMicroelectronics

L6920
Table 1. Pin Description
Figure 2. Pin Connection (Top view)
Table 2. Absolute Maximum Ratings
Table 3. Thermal Data
2/13
Symbol
Symbol
R
V
Pin
V
out max
th j-amb
1
2
3
4
5
6
7
8
ccmax
T
j
SHDN
Name
LBO
GND
REF
OUT
LBI
V
LBI, SHDN, FB to GND
Vout to GND
Thermal Resistance Junction to Ambient
Maximum Junction Temperature
FB
LX
cc
to GND
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].
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:
Battery low voltage detector output. If the voltage at the LBI pin drops below the internal
threshold typ. 1.23V,
The
correct output setting [see R3, fig. 7].
1.23V reference voltage. Bypass this output to GND with a 100nF capacitor for filtering high
frequency noise. No capacitor is required for stability
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.
Ground pin
Step-up inductor connection
Power OUTPUT pin
LBO
is an open drain output and so a pull-up resistor (about 200KΩ) has to be added for
LBO
REF
LBI
FB
Parameter
Parameter
LBO
V
LBI
goes low.
1
2
3
4
=
1.23V
TSSOP8
⋅
⎛
⎝
1
+
8
7
6
5
Function
R1
------- -
R2
⎞
⎠
[see R1 and R2, fig. 7]
OUT
LX
GND
SHDN
Value
Value
250
150
6
6
6
°C/W
Unit
Unit
°C
V
V
V