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ST777 bảng dữ liệu(PDF) 2 Page - STMicroelectronics

tên linh kiện ST777
Giải thích chi tiết về linh kiện  LOW VOLTAGE INPUT, 3-3.3V/5V/ADJUSTABLE OUTPUT DC-DC CONVERTER WITH SYNCHRONOUS RECTIFIER
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST777 bảng dữ liệu(HTML) 2 Page - STMicroelectronics

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ST777/778/779
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ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
ORDERING CODES
CONNECTION DIAGRAM
PIN CONNECTIONS
THERMAL DATA
Symbol
Parameter
Value
Unit
VCC
DC Input Voltage to GND
-0.3 to +7
V
LX
Switch off Pin Voltage
-0.3 to +7
V
Switch on Pin Voltage
30 sec short to IN or OUT
OUT, SHDN
Output, Shutdown Voltage
-0.3 to +7
V
AGND to PGND
Analog and Power Ground
-0.3 to +0.3
V
FB
FB Pin Voltage
-0.3 to (OUT+0.3)
V
PTOT
Continuous Power Dissipation (at TA = 85°C) DIP-8
550
mW
Continuous Power Dissipation (at TA = 85°C) SO-8
344
TSTG
Storage Temperature Range
-40 to 150
°C
TOP
Operating Ambient Temperature Range
0to85
°C
TYPE
DIP-8
SO-8
ST777
ST777ACN
ST777ACD
ST778
ST778ACN
ST778ACD
ST779
ST779ACN
ST779ACD
Pin No.
SYMBOL
NAME AND FUNCTION
1
ILIM
Sets switch current limit input. Connect to IN for 1A current limit. A resistor from ILIM to IN
sets lower peak inductor currents.
2
IN
Input from battery
3
AGND
Analog ground. Not internally connected to PGND.
4
PGND
Power ground. Must be low impedance; solder directly to ground plane or star ground.
Connect to AGND, close to the device.
5
LX
Collector of 1A NPN power switch and emitter of Sinchronous Rectifier PNP.
6
OUT
Voltage Output. Connect filter capacitor close to pin.
7SHDN
Shutdown input disables power supply when low. Also disconnets load from input. Threshold
is set at VIN/2.
8
SEL/N.C./FB - Selection pin for 3/3.3V version (778);
- Not internally connected for 5V version (777);
- Feedback pin for adjustable version (779).
Symbol
Parameter
DIP-8
SO-8
Unit
Rthj-amb
Thermal Resistance Junction-ambient
100
160
°C/W


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