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LT1129IS8 Datasheet(PDF) 8 Page - Linear Integrated Systems |
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LT1129IS8 Datasheet(HTML) 8 Page - Linear Integrated Systems |
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8 / 16 page  8 LT1129/LT1129-3.3/LT1129-5 112935fc LT1129-5 Transient Response Load Regulation LT1129-5 Transient Response TYPICAL PERFOR A CE CHARACTERISTICS Input Pin: Power is supplied to the device through the input pin. The input pin should be bypassed to ground if the device is more than 6 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 1µF to 10µF is sufficient. The LT1129 is designed to withstand reverse voltages on the input pin with respect to both ground and the output pin. In the case of a reversed input, which can happen if a battery is plugged in backwards, the LT1129 will act as if there is a diode in series with its input. There will be no reverse current flow into the LT1129 and no reverse voltage will appear at the load. The device will protect both itself and the load. Output Pin: The output pin supplies power to the load. An output capacitor is required to prevent oscillations. See the Applications Information section for recommended value of output capacitance and information on reverse output characteristics. Shutdown Pin (SHDN): This pin is used to put the device into shutdown. In shutdown the output of the device is turned off. This pin is active low. The device will be shut down if the shutdown pin is actively pulled low. The shutdown pin current with the pin pulled to ground will be 6µA. The shutdown pin is internally clamped to 7V and – 0.6V (one VBE). This allows the shutdown pin to be driven directly by 5V logic or by open collector logic with a pull- up resistor. The pull-up resistor is only required to supply the leakage current of the open collector gate, normally several microamperes. Pull-up current must be limited to a maximum of 20mA. A curve of shutdown pin input current as a function of voltage appears in the Typical Performance Characteristics. If the shutdown pin is not used it can be left open circuit. The device will be active, output on, if the shutdown pin is not connected. Sense Pin: For fixed voltage versions of the LT1129 (LT1129-3.3, LT1129-5) the sense pin is the input to the error amplifier. Optimum regulation will be obtained at the point where the sense pin is connected to the output pin. For most applications the sense pin is connected directly to the output pin at the regulator. In critical applications small voltage drops caused by the resistance (RP) of PC traces between the regulator and the load, which would normally degrade regulation, may be eliminated by con- necting the sense pin to the output pin at the load as shown in Figure 1 (Kelvin Sense Connection). Note that the voltage drop across the external PC traces will add to the dropout voltage of the regulator. The sense pin bias current is 15µA at the nominal regulated output voltage. This pin is internally clamped to – 0.6V (one VBE). TEMPERATURE (°C) –50 0 –5 –10 –15 –20 –25 –30 0 50 75 1129 G09 –25 25 100 125 LT1129* LT1129-3.3 LT1129-5 VIN = VOUT(NOMINAL) + 1V ∆ILOAD = 1mA to 700mA *VADJ = VOUT TIME (µs) 0 0.10 0.05 0 –0.05 –0.10 400 1129 G31 50 200 300 500 0.6 0.5 100 150 250 350 450 VIN = 6V CIN = 3.3µF COUT = 3.3µF TIME (ms) 0 0.2 0.1 0 –0.1 –0.2 1.6 1129 G32 0.2 0.8 1.2 2.0 0.7 0.5 0.3 0.1 0.4 0.6 1.0 1.4 1.8 VIN = 6V CIN = 3.3µF COUT = 47µF PI FU CTIO S |
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