DESCRIPCIÓN

The LT3065 Series are micropower, low noise, low dropout voltage (LDO) linear regulators that operate over a 1.6V to 45V input voltage range. The devices supply 500mA of output current with a typical dropout voltage of 300mV. A single external capacitor provides programmable low noise reference performance and output soft-start functionality. A single external resistor programs the LT3065’s current limit, accurate to ±10% over a wide input voltage and temperature range. A PWRGD flag indicates output regulation.

The LT3065 optimizes stability and transient response with low ESR ceramic capacitors, requiring a minimum of 3.3µF. Internal protection circuitry includes current limiting with foldback, thermal limiting, reverse battery protection, reverse current protection and reverse output protection.

The LT3065 is available in fixed output voltages of 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V, and as an adjustable device with an output voltage range from 0.6V to 40V. The LT3065 is available in the thermally-enhanced 10-lead 3mm × 3mm DFN and 12-lead MSOP packages.

 

CARACTERÍSTICAS

Input Voltage Range: 1.6V to 45V

Output Current: 500mA

Dropout Voltage: 300mV

Programmable Precision Current Limit: ±10%

Bandera Power Good

Low Noise: 25µVRMS (10Hz to 100kHz)

Adjustable Output (VREF = VOUT(MIN) = 600mV)

Output Tolerance: ±2% Over Line, Load and Temperature

Stable with Low ESR, Ceramic Output Capacitors (3.3µF Minimum)

Single Capacitor Soft-Starts Reference and Lowers Output Noise

Current Limit Foldback Protection

Shutdown Current: <1µA

Reverse Battery and Thermal Limit Protection

10-Lead 3mm × 3mm DFN and 12-lead MSOP Packages

Cualificación AEC-Q100 para aplicaciones de automoción

 

APLICACIONES

Battery-Powered Systems

Automotive Power Supplies

Industrial Power Supplies

Avionic Power Supplies

Portable Instruments

 

INFORMACIÓN SOBRE APLICACIONES

The LT3065 are micropower, low noise and low drop-out voltage, 500mA linear regulators with micropower shutdown, programmable current limit, and a Power-good flag. The devices supply up to 500mA at a typical dropout voltage of 300mV and operate over a 1.6V to 45V input range.

A single external capacitor provides 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 25μVRMS over a 10Hz to 100kHz bandwidth. This capacitor also soft starts the reference and prevents output voltage overshoot at turn-on.

The LT3065’s quiescent current is merely 55μA but provides fast transient response with a low ESR, minimum value 3.3μF ceramic output capacitor. In shutdown, quiescent current is less than 1μA and the reference soft-start capacitor is reset.

The LT3065 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 LT3065 typically provides better than 0.1% line regulation and 0.1% 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, automotive and industrial systems.In battery backup applications where the output is held up by a backup battery and the input is pulled to ground, the LT3065 acts like it has a diode in series with its output and prevents reverse current.

Bypass Capacitance and Output Voltage Noise

The LT3065 regulator provides low output voltage noise over a 10Hz to 100kHz bandwidth while operating at full load with the addition of a bypass capacitor (CREF/BYP) from the REF/BYP pin to GND. A high quality low leakage capacitor is recommended. This capacitor bypasses the internal reference of the regulator, providing a low frequency noise pole for the internal reference. With the use of 10nF for CREF/BYP, output voltage noise decreases to as low as 25μVRMS when the output voltage is set for 0.6V. For higher output voltages (generated by using a feedback resistor divider), the output voltage noise gains up proportionately when using CREF/BYP.