Datasheet LT3007 (Analog Devices) - 9
| Fabricante | Analog Devices |
| Descripción | 3μA IQ, 20mA, 45V Low Dropout Fault Tolerant Linear Regulators |
| Páginas / Página | 20 / 9 — PIN FUNCTIONS SHDN (Pin 1):. ADJ (Pin 8):. SENSE (Pin 8):. GND (Pins 2, … |
| Formato / tamaño de archivo | PDF / 344 Kb |
| Idioma del documento | Inglés |
PIN FUNCTIONS SHDN (Pin 1):. ADJ (Pin 8):. SENSE (Pin 8):. GND (Pins 2, 3, 4):. IN (Pin 5):. NC (Pin 6):. OUT (Pin 7):
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Versión de texto del documento
LT3007 Series
PIN FUNCTIONS SHDN (Pin 1):
Shutdown. Pulling the SHDN pin low puts
ADJ (Pin 8):
Adjust. This pin is the error amplifier’s inverting the LT3007 into a low power state and turns the output terminal. Its 400pA typical input bias current flows out of off. If unused, tie the SHDN pin to VIN. The LT3007 does the pin (see curve of ADJ Pin Bias Current vs Temperature not function if the SHDN pin is not connected. The SHDN in the Typical Performance Characteristics section). The pin cannot be driven below GND unless tied to the IN pin. ADJ pin voltage is 600mV referenced to GND and the If the SHDN pin is driven below GND while IN is powered, output voltage range is 600mV to 44.5V. the output will turn on. SHDN pin logic cannot be refer-
SENSE (Pin 8):
Sense. For fixed voltage versions of the enced to a negative rail. LT3007 (LT3007-1.2, LT3007-1.5, LT3007-1.8, LT3007-
GND (Pins 2, 3, 4):
Ground. Connect the bottom of the 2.5, LT3007-3.3, LT3007-5), the SENSE pin is the input to resistor divider that sets output voltage directly to GND the error amplifier. Optimum regulation is obtained at the for the best regulation. point where the SENSE pin is connected to the OUT pin of
IN (Pin 5):
Input. The IN pin supplies power to the device. the regulator. In critical applications, small voltage drops The LT3007 requires a bypass capacitor at IN if the device are caused by the resistance (RP) of PC traces between the regulator and the load. These may be eliminated by is more than six inches away from the main input filter connecting the SENSE pin to the output at the load as capacitor. In general, the output impedance of a battery shown in Figure 1 (Kelvin Sense Connection). Note that rises with frequency, so it is advisable to include a bypass the voltage drop across the external PC traces add to the capacitor in battery-powered circuits. A bypass capacitor dropout voltage of the regulator. The SENSE pin bias current in the range of 0.1µF to 10µF will suffice. The LT3007 is 1µA at the nominal rated output voltage. The SENSE pin withstands reverse voltages on the IN pin with respect to can be pulled below ground (as in a dual supply system ground and the OUT pin. In the case of a reversed input, where the regulator load is returned to a negative supply) which occurs with a battery plugged in backwards, the and still allow the device to start and operate. LT3007 acts as if a blocking diode is in series with its input. No reverse current flows into the LT3007 and no RP reverse voltage appears at the load. The device protects IN OUT both itself and the load. LT3007 + +
NC (Pin 6):
No Connect. Pin 6 is an NC pin in the TSOT-23 SHDN SENSE V LOAD IN package. This pin is not tied to any internal circuitry. LTC GND recommends that the NC pin be floated for fault tolerant 3007 F01 RP operation.
OUT (Pin 7):
Output. This pin supplies power to the load.
Figure 1. Kelvin Sense Connection
Use a minimum output capacitor of 2.2µF to prevent os- cillations. Large load transient applications require larger output capacitors to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse-output characteristics. 3007fa For more information www.linear.com/LT3007 9
PIN FUNCTIONS SHDN (Pin 1):
Shutdown. Pulling the SHDN pin low puts
ADJ (Pin 8):
Adjust. This pin is the error amplifier’s inverting the LT3007 into a low power state and turns the output terminal. Its 400pA typical input bias current flows out of off. If unused, tie the SHDN pin to VIN. The LT3007 does the pin (see curve of ADJ Pin Bias Current vs Temperature not function if the SHDN pin is not connected. The SHDN in the Typical Performance Characteristics section). The pin cannot be driven below GND unless tied to the IN pin. ADJ pin voltage is 600mV referenced to GND and the If the SHDN pin is driven below GND while IN is powered, output voltage range is 600mV to 44.5V. the output will turn on. SHDN pin logic cannot be refer-
SENSE (Pin 8):
Sense. For fixed voltage versions of the enced to a negative rail. LT3007 (LT3007-1.2, LT3007-1.5, LT3007-1.8, LT3007-
GND (Pins 2, 3, 4):
Ground. Connect the bottom of the 2.5, LT3007-3.3, LT3007-5), the SENSE pin is the input to resistor divider that sets output voltage directly to GND the error amplifier. Optimum regulation is obtained at the for the best regulation. point where the SENSE pin is connected to the OUT pin of
IN (Pin 5):
Input. The IN pin supplies power to the device. the regulator. In critical applications, small voltage drops The LT3007 requires a bypass capacitor at IN if the device are caused by the resistance (RP) of PC traces between the regulator and the load. These may be eliminated by is more than six inches away from the main input filter connecting the SENSE pin to the output at the load as capacitor. In general, the output impedance of a battery shown in Figure 1 (Kelvin Sense Connection). Note that rises with frequency, so it is advisable to include a bypass the voltage drop across the external PC traces add to the capacitor in battery-powered circuits. A bypass capacitor dropout voltage of the regulator. The SENSE pin bias current in the range of 0.1µF to 10µF will suffice. The LT3007 is 1µA at the nominal rated output voltage. The SENSE pin withstands reverse voltages on the IN pin with respect to can be pulled below ground (as in a dual supply system ground and the OUT pin. In the case of a reversed input, where the regulator load is returned to a negative supply) which occurs with a battery plugged in backwards, the and still allow the device to start and operate. LT3007 acts as if a blocking diode is in series with its input. No reverse current flows into the LT3007 and no RP reverse voltage appears at the load. The device protects IN OUT both itself and the load. LT3007 + +
NC (Pin 6):
No Connect. Pin 6 is an NC pin in the TSOT-23 SHDN SENSE V LOAD IN package. This pin is not tied to any internal circuitry. LTC GND recommends that the NC pin be floated for fault tolerant 3007 F01 RP operation.
OUT (Pin 7):
Output. This pin supplies power to the load.
Figure 1. Kelvin Sense Connection
Use a minimum output capacitor of 2.2µF to prevent os- cillations. Large load transient applications require larger output capacitors to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse-output characteristics. 3007fa For more information www.linear.com/LT3007 9