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LT3060MPTS8TRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LT3060MPTS8TRPBF Datasheet(HTML) 11 Page - Linear Technology |
11 / 20 page LT3060 11 3060f TheLT3060isamicropower,lownoise,lowdropoutvoltage, 100mA linear regulator with micropower shutdown. The device supplies up to 100mA at a typical dropout voltage of 300mV and operates over a 1.6V to 45V input range. A single external capacitor can provide programmable low noise reference performance and output soft-start functionality. For example, connecting a 10nF capacitor from the REF/BYP pin to GND lowers output noise to 30μVRMS over a 10Hz to 100kHz bandwidth. This capacitor also soft-starts the reference and prevents output voltage overshoot at turn-on. The LT3060’s quiescent current is merely 40μA but provides fast transient response with a minimum low ESR 2.2μF ceramic output capacitor. In shutdown, quiescent current is less than 1μA and the reference soft-start capacitor is reset. The LT3060 optimizes stability and transient response with low ESR, ceramic output capacitors. The regulator does not require the addition of ESR as is common with other regulators. The LT3060 typically provides 0.1% line regulation and 0.03% load regulation. Internal protection circuitry includes reverse-battery protection, reverse-output protection, reverse-current protection, current limit with foldback and thermal shutdown. This “bullet-proof” protection set makes it ideal for use in battery-powered systems. In battery backup applications where the output is held up by a backup battery and the input is pulled to ground, the LT3060 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 returned to a negative supply, the output can be pulled below ground by as much as 45V and the device still starts normally and operates. Adjustable Operation TheLT3060hasanoutputvoltagerangeof0.6Vto44.5V.The output voltage is set by the ratio of two external resistors, as shown in Figure 1. The device servos the output to maintain the ADJ pin voltage at 0.6V referenced to ground. The current in R1 is then equal to 0.6V/R1, and the current in R2 is the current in R1 minus the ADJ pin bias current. APPLICATIONS INFORMATION 3060 F01 IN SHDN OUT ADJ GND REF/BYP LT3060 VIN VOUT R2 R1 Figure 1. Adjustable Operation VV R R IR VV I OUT ADJ ADJ AD =+ ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ • () = 06 1 2 1 2 06 .– . JJ nA at C OUTPUT RANGE V to V = = 15 25 0 6 44 5 º .. The ADJ pin bias current, 15nA at 25˚C, flows from the ADJ pin through R1 to GND. Calculate the output voltage using the formula in Figure 1. The value of R1 should be no greater than 124k to provide a minimum 5μA load current so that errors in the output voltage, caused by the ADJ pin bias current, are minimized. Note that in shutdown, the output is turned off and the divider current is zero. Curves of ADJ Pin Voltage vs Temperature and ADJ Pin Bias Current vs Temperature appear in the Typical Performance Characteristics Section. The LT3060 is tested and specified with the ADJ pin tied to the OUT pin, yielding VOUT = 0.6V. Specifications for output voltages greater than 0.6V are proportional to the ratio of the desired output voltage to 0.6V:VOUT/0.6V. For example, load regulation for an output current change of 1mA to 100mA is 0.2mV (typical) at VOUT = 0.6V. At VOUT = 12V, load regulation is: 12 06 02 4 V V mV mV . (. ) •= Table 1 shows 1% resistor divider values for some common output voltages with a resistor divider current of 5μA. Table 1. Output Voltage Resistor Divider Values VOUT (V) R1 (k Ω) R2 (k Ω) 1.2 118 118 1.5 121 182 1.8 124 249 2.5 115 365 3 124 499 3.3 124 562 5 115 845 |
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