Electronic Components Datasheet Search |
|
LTC1710 Datasheet(PDF) 7 Page - Linear Technology |
|
LTC1710 Datasheet(HTML) 7 Page - Linear Technology |
7 / 8 page 7 LTC1710 OPERATIO until about 300 µs after VCC crosses the undervoltage lockout threshold (typically 2V). The circuit includes some hysteresis and delay to avoid nuisance resets. Once opera- tion begins, VCC must drop below the threshold for at least 100 µs to trigger another POR sequence. Input Threshold Anticipating the trend of lower and lower supply voltages, the SMBus is specified with a VIH of 1.4V and a VIL of 0.6V. While some SMBus parts may violate this stringent SMBus specification by specifying a higher VIH value for a corre- sponding higher input supply voltage, the LTC1710 meets and maintains the constant SMBus input threshold speci- fication throughout the entire supply voltage range of 2.7V to 5.5V. Thermal Shutdown In the unlikely event that either power switch overheats, a thermal shutdown circuit, which is placed closely to the two switches, will activate and turn off the gate drives to both switches. The thermal shutdown circuit has a thresh- old of 120 °C with a 15°C hysteresis. Figure 3. Low Dropout Regulator Switching a 3.3V/300mA Supply Figure 4. The LTC1710 Switching Two Different Voltage Loads Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. Charge Pump To fully enhance the internal N-channel power switches, an internal charge pump is used to boost the gate drive to a maximum of 6V above VCC. The reason for the maximum charge pump output voltage limit is to protect the internal switches from excessive gate overdrive. A feedback net- work is used to limit the charge pump output once it is 6V above VCC. To prevent the power switches from turning on too fast, an internal current source is placed between the output of the charge pump and the gate of the power switch to control the ramp rate. Since the charge pumps are driving just the gates of the internal switches, only a small amount of current is required. Therefore, all the charge pump capacitors are integrated onboard. The drain of switch 1 is internally connected to VCC, however, the drain of switch 0 is user controlled through Pin 1. In other words, SMBus devices using different power supply voltages can be simulta- neously switched by the same LTC1710. Power-On Reset and Undervoltage Lockout The LTC1710 starts up with both gate drives low. An internal power-on reset (POR) signal inhibits operation TYPICAL APPLICATIONS The LTC1710, when used with the LT ®1521-3.3, can switch a regulated 3.3V/300mA supply to a load (Figure 3). Also, with the help of the LT1304-5, the LTC1710 can be used to make a boost switching regulator with output disconnect and a low standby current of 22 µA (Figure 5). 81 2 10 µF 10 µF 7 5 6 FROM SMBus 3 PROGRAMMABLE 4 1710 F04 VCC SW0D 5V 3.3V CLK DATA OUT0 LTC1710 OUT1 AD1 GND 3.3V LOAD 5V LOAD 8 7 1 10 µF 1 µF 2 5 6 8 5 1 2 FROM SMBus 3 PROGRAMMABLE 4 1710 F03 VCC SW0D 5V CLK DATA SWITCHED 3.3V OUT1 LTC1710 VIN SHDN VOUT SENSE LT1521-3.3 OUT0 AD1 GND 1.5 µF 3.3V |
Similar Part No. - LTC1710_15 |
|
Similar Description - LTC1710_15 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |