Summary of LT3086 – 40V, 2.1A Low Dropout Adjustable Linear Regulator with Monitoring and Cable Drop Compensation
The LT3086 is a versatile 2.1A low dropout linear regulator featuring a wide input range of 1.4V to 40V and precise output voltage control via a single resistor. It offers advanced diagnostics including current and temperature monitoring, programmable cable drop compensation, and power good flags. The device supports parallel operation for increased current and ensures stability with ceramic capacitors while providing robust protection against reverse polarity and thermal issues across multiple package options.
Parts used in the LT3086 Project:
- LT3086 Linear Regulator
- Single Resistor for Output Voltage Setting
- Ceramic Output Capacitor (Minimum 10μF)
- External Current Limit Components
- Thermal Limit Programming Components
Features
- Wide Input Voltage Range: 1.4V to 40V
- 1 Resistor Sets Output Voltage: 0.4V to 32V
- Output Current: 2.1A
- ±2% Tolerance Over Line, Load and Temperature
- Output Current Monitor: IMON = IOUT/1000
- Temperature Monitor with Programmable Thermal Limit
- Programmable Cable Drop Compensation
- Parallel Multiple Devices for Higher Current
- Dropout Voltage: 330mV
- 1 Capacitor Soft-Starts Output and Decreases Noise
- Low Output Noise: 40μVRMS (10Hz to 100kHz)
- Precision, Programmable External Current Limit
- Power Good Flag with Programmable Threshold
- Ceramic Output Capacitors: 10μF Minimum
- Quiescent Current in Shutdown: <1μA
- Reverse-Battery, -Current and -Output Protection
- Available in 5mm × 4mm 16-Lead DFN, 16-Lead TSSOP, 7-Lead DD-Pak and 7-Lead TO-220.
Typical Application
Description
The LT®3086 is a multi-feature, low dropout, low noise 2.1A linear regulator that operates over a 1.4V to 40V input supply range. Dropout voltage at 2.1A is typically 330mV. One resistor sets output voltage from 0.4V to 32V. Output voltage tolerance is guaranteed to ±2% over line, load and temperature. The LT3086 is stable with ceramic output capacitors, requiring a minimum of 10μF.
The LT3086’s programmable cable drop compensation cancels output voltage errors caused by resistive connections to the load. A master/slave configuration allows paralleling of multiple devices for higher load current and heat spreading without external ballast resistor requirements.
Output current and temperature monitoring along with a power good flag provide system diagnostic and debug capability. Internal fault circuitry includes thermal shutdown and current limit with foldback. Thermal limit and current limit are also externally programmable.
Packages include the thermally enhanced 16-lead (5mm × 4mm) DFN, 16-lead TSSOP, 7-lead DD-Pak and 7-lead TO-220.
For more detail: LT3086 – 40V, 2.1A Low Dropout Adjustable Linear Regulator with Monitoring and Cable Drop Compensation
- What is the input voltage range?
The device operates over an input supply range of 1.4V to 40V. - How many resistors are needed to set the output voltage?
Only one resistor is required to set the output voltage from 0.4V to 32V. - Can multiple devices be paralleled for higher current?
Yes, a master/slave configuration allows paralleling multiple devices without external ballast resistors. - Does the LT3086 support cable drop compensation?
Yes, it features programmable cable drop compensation to cancel errors caused by resistive connections. - What is the minimum capacitance required for stability?
The regulator is stable with ceramic output capacitors requiring a minimum of 10μF. - How does the device handle thermal protection?
It includes internal thermal shutdown and externally programmable thermal limits. - What monitoring capabilities does the chip offer?
It provides output current monitoring, temperature monitoring, and a power good flag. - What packages are available for the LT3086?
Available packages include 16-lead DFN, 16-lead TSSOP, 7-lead DD-Pak, and 7-lead TO-220.
