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1. DESCRIPTION
The LT®3010 is a high voltage, micropower low dropout linear regulator. The device is capable of supplying 50mA output current with a dropout voltage of 300mV. Designed for use in battery-powered or high voltage systems, the low quiescent current (30µA operating and 1µA in shutdown) makes the LT3010 an ideal choice. Quiescent current is also well controlled in dropout. Other features of the LT3010 include the ability to operate with very small output capacitors. The regulators are stable with only 1µF on the output while most older devices require between 10µF and 100µF for stability. Small ceramic capacitors can be used without the necessary addition of ESR as is common with other regulators. Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection. The device is available in a fixed output voltage of 5V and as an adjustable device with a 1.275V reference voltage. The LT3010 regulator is available in the 8-lead MSOP package with an exposed pad for enhanced thermal handling capability.
2. FEATURES
1. Wide Input Voltage Range: 3V to 80V
2. Low Quiescent Current: 30µA
3. Low Dropout Voltage: 300mV
4. Output Current: 50mA
5. Thermally Enhanced 8-Lead MSOP Package
6. No Protection Diodes Needed
7. Fixed Output Voltage: 5V (LT3010-5)
8. Adjustable Output from 1.275V to 60V (LT3010)
9. 1µA Quiescent Current in Shutdown
10. Stable with 1µF Output Capacitor
11. Stable with Aluminum, Tantalum or Ceramic Capacitors
12. Reverse-Battery Protection
13. No Reverse Current Flow from Output
14. Thermal Limiting
15. AEC-Q100 Qualified for Automotive Applications
3. APPLICATIONS
1. Low Current High Voltage Regulators
2. Regulator for Battery-Powered Systems
3. Telecom Applications
4. Automotive Applications
4. Pin configuration
5. APPLICATIONS INFORMATION
The LT3010 is a 50mA high voltage low dropout regulator with micropower quiescent current and shutdown. The device is capable of supplying 50mA at a dropout voltage of 300mV. The low operating quiescent current (30µA) drops to 1µA in shutdown. In addition to the low quiescent current, the LT3010 incorporates several protection features which make it ideal for use in battery-powered systems. The device is 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 LT3010 acts like it has a diode in series with its output and prevents reverse current flow.
6. Adjustable Operation
The adjustable version of the LT3010 has an output voltage range of 1.275V to 60V. 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 voltage at the adjust pin at 1.275V referenced to ground. The current in R1 is then equal to 1.275V/R1 and the current in R2 is the current in R1 plus the ADJ pin bias current. The ADJ pin bias current, 50nA at 25°C, flows through R2 into the ADJ pin. The output voltage can be calculated using the formula in Figure 2. The value of R1 should be less than 250k to minimize errors in the output voltage caused by the ADJ pin bias current. Note that in shutdown the output is turned off and the divider current will be zero. A small capacitor (C1) placed in parallel with the top resistor (R2) of the output divider is necessary for stability and transient performance of the adjustable LT3010. The impedance of C1 at 10kHz should be less than the value of R1.The adjustable device is tested and specified with the ADJ pin tied to the OUT pin and a 5µA DC load (unless otherwise specified) for an output voltage of 1.275V. Specifications for output voltages greater than 1.275V will be proportional to the ratio of the desired output voltage to 1.275V; (VOUT/1.275V).
