Datasheet LT3514 (Analog Devices) - 9
| 制造商 | Analog Devices |
| 描述 | Triple Step-Down Switching Regulator with 100% Duty Cycle Operation |
| 页数 / 页 | 26 / 9 — PIN FUNCTIONS (QFN/TSSOP). RT/SYNC (Pin 17/Pin 17):. PG (Pin 23/Pin 21):. … |
| 文件格式/大小 | PDF / 482 Kb |
| 文件语言 | 英语 |
PIN FUNCTIONS (QFN/TSSOP). RT/SYNC (Pin 17/Pin 17):. PG (Pin 23/Pin 21):. SW5 (Pin 24/Pin 23):
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LT3514
PIN FUNCTIONS (QFN/TSSOP) RT/SYNC (Pin 17/Pin 17):
Set the switching frequency
PG (Pin 23/Pin 21):
The Power Good pin is the open of the LT3514 by tying an external resistor from this pin collector output of an internal comparator. PG remains to ground. Select the value of the programming resistor low until all FB pins are greater than 710mV. If not in use, (RT) according to Table 1 in the Applications Information this pin can be left unconnected. The PG comparator is section. The RT/SYNC pin is also used to synchronize the disabled in shutdown. internal oscillator of the LT3514 to an external signal. The synchronization (sync) signal is directly logical compatible
SW5 (Pin 24/Pin 23):
The SW5 pin is an open collector and can be driven by any signal with pulse width greater of an internal boost regulator power switch. This power than 50ns. The synchronization range is from 350kHz to switch generates the drive voltage 4.85V above the input 2.2MHz. voltage (VIN), to drive the internal buck regulator power switches. Connect an inductor from this pin to the VIN pin.
FB (Pins 19, 20, 21/Pins 18,19, 20):
Each feedback pin is regulated to 800mV. Connect the feedback resistor divider
SKY (Pin 25/Pin 24):
The SKY pin is the output of an in- to this pin. The output voltage is programmed according tegrated power Schottky diode and is the source of drive to the following equation: voltage to the internal buck regulator power switches. Connect a 1µF capacitor from this pin to the VIN pin. Do V not drive this pin with an external voltage source. Do not R1= R2 • OUT − 1 draw current from this pin with an external component. 0.8V where R1 connects between OUT and FB, and R2 connects between FB and GND. A good value for R2 is 10.2kΩ. 3514fa For more information www.linear.com/LT3514 9 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts
PIN FUNCTIONS (QFN/TSSOP) RT/SYNC (Pin 17/Pin 17):
Set the switching frequency
PG (Pin 23/Pin 21):
The Power Good pin is the open of the LT3514 by tying an external resistor from this pin collector output of an internal comparator. PG remains to ground. Select the value of the programming resistor low until all FB pins are greater than 710mV. If not in use, (RT) according to Table 1 in the Applications Information this pin can be left unconnected. The PG comparator is section. The RT/SYNC pin is also used to synchronize the disabled in shutdown. internal oscillator of the LT3514 to an external signal. The synchronization (sync) signal is directly logical compatible
SW5 (Pin 24/Pin 23):
The SW5 pin is an open collector and can be driven by any signal with pulse width greater of an internal boost regulator power switch. This power than 50ns. The synchronization range is from 350kHz to switch generates the drive voltage 4.85V above the input 2.2MHz. voltage (VIN), to drive the internal buck regulator power switches. Connect an inductor from this pin to the VIN pin.
FB (Pins 19, 20, 21/Pins 18,19, 20):
Each feedback pin is regulated to 800mV. Connect the feedback resistor divider
SKY (Pin 25/Pin 24):
The SKY pin is the output of an in- to this pin. The output voltage is programmed according tegrated power Schottky diode and is the source of drive to the following equation: voltage to the internal buck regulator power switches. Connect a 1µF capacitor from this pin to the VIN pin. Do V not drive this pin with an external voltage source. Do not R1= R2 • OUT − 1 draw current from this pin with an external component. 0.8V where R1 connects between OUT and FB, and R2 connects between FB and GND. A good value for R2 is 10.2kΩ. 3514fa For more information www.linear.com/LT3514 9 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts