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LT1962EMS8-3.3 Datasheet(PDF) 11 Page - Linear Technology |
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LT1962EMS8-3.3 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LT1962 Series Figure 1. Kelvin Sense Connection IN SHDN 1962 F01 RP OUT VIN SENSE GND LT1962 RP 4 2 1 5 8 + + LOAD PI FU CTIO S pin. The ADJ pin voltage is 1.22V referenced to ground and the output voltage range is 1.22V to 20V. BYP (Pin 3): Bypass. The BYP pin is used to bypass the reference of the LT1962 to achieve low noise performance from the regulator. The BYP pin is clamped internally to ±0.6V (one VBE). A small capacitor from the output to this pin will bypass the reference to lower the output voltage noise. A maximum value of 0.01 µF can be used for reducing output voltage noise to a typical 20 µVRMS over a 10Hz to 100kHz bandwidth. If not used, this pin must be left unconnected. GND (Pin 4): Ground. SHDN (Pin 5): Shutdown. The SHDN pin is used to put the LT1962 regulators into a low power shutdown state. The output will be off when the SHDN pin is pulled low. The SHDN pin can be driven either by 5V logic or open- collector logic with a pull-up resistor. The pull-up resistor is required to supply the pull-up current of the open- collector gate, normally several microamperes, and the SHDN pin current, typically 1 µA. If unused, the SHDN pin must be connected to VIN. The device will not function if the SHDN pin is not connected. NC (Pins 6, 7): No Connect. These pins are not internally connected. For improved power handling capabilities, these pins can be connected to the PC board. IN (Pin 8): Input. Power is supplied to the device through the IN pin. A bypass capacitor is required on this pin if the device is more than six inches away from the main input filter capacitor. In general, the output impedance of a battery rises with frequency, so it is advisable to include a bypass capacitor in battery-powered circuits. A bypass capacitor in the range of 1 µF to 10µF is sufficient. The LT1962 regulators are designed to withstand reverse voltages on the IN pin with respect to ground and the OUT pin. In the case of a reverse input, which can happen if a battery is plugged in backwards, the device will act as if there is a diode in series with its input. There will be no reverse current flow into the regulator and no reverse voltage will appear at the load. The device will protect both itself and the load. APPLICATIO S I FOR ATIO The LT1962 series are 300mA low dropout regulators with micropower quiescent current and shutdown. The devices are capable of supplying 300mA at a dropout voltage of 300mV. Output voltage noise can be lowered to 20 µVRMS over a 10Hz to 100kHz bandwidth with the addition of a 0.01 µF reference bypass capacitor. Additionally, the refer- ence bypass capacitor will improve transient response of the regulator, lowering the settling time for transient load conditions. The low operating quiescent current (30 µA) drops to less than 1 µA in shutdown. In addition to the low quiescent current, the LT1962 regulators incorporate sev- eral protection features which make them ideal for use in battery-powered systems. The devices are protected against both reverse input and reverse output voltages. In battery backup applications where the output can be held up by a backup battery when the input is pulled to ground, the LT1962-X acts like it has a diode in series with its output and prevents reverse current flow. Additionally, in dual supply applications where the regulator load is re- turned to a negative supply, the output can be pulled below ground by as much as 20V and still allow the device to start and operate. Adjustable Operation The adjustable version of the LT1962 has an output voltage range of 1.22V to 20V. The output voltage is set by the ratio of two external resistors as shown in Figure 2. The device servos the output to maintain the ADJ pin voltage at 1.22V referenced to ground. The current in R1 is then equal to 1.22V/R1 and the current in R2 is the current in R1 |
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