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參數(shù)資料
| 型號： | L6920DTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.2 A SWITCHING REGULATOR, PDSO8 |
| 封裝： | 4.40 MM, TSSOP-8 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 318K |
| 代理商： | L6920DTR |
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,
LBO goes low.
The
LBO is an open drain output and so a pull-up resistor (about 200K
) 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
Vccmax
Vcc to GND
6
V
LBI, SHDN, FB to GND
6
V
Vout max
Vout to GND
6
V
Symbol
Parameter
Value
Unit
Rth j-amb
Thermal Resistance Junction to Ambient
250
°C/W
Tj
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
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