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ST779 bảng dữ liệu(PDF) 2 Page - STMicroelectronics |
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ST779 bảng dữ liệu(HTML) 2 Page - STMicroelectronics |
2 / 11 page ST777/778/779 2/11 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 |
Số phần tương tự - ST779 |
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Mô tả tương tự - ST779 |
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