Datasheet LT3083 (Analog Devices) - 4

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ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C (Note 2). PARAMETER CONDITIONS MIN TYP MAX UNITS
VCONTROL Dropout Voltage (Note 4) ILOAD = 100mA 1.2 V ILOAD = 1A l 1.22 1.55 V ILOAD = 3A l 1.25 1.6 V VIN Dropout Voltage (Note 4) ILOAD = 100mA l 10 25 mV ILOAD = 1A, Q, T Packages l 120 190 mV ILOAD = 1A, DF, FE Packages l 90 160 mV ILOAD = 3A, Q, T Packages l 310 510 mV ILOAD = 3A, DF, FE Packages l 240 420 mV VCONTROL Pin Current (Note 5) ILOAD = 100mA l 5.5 10 mA ILOAD = 1A l 18 35 mA ILOAD = 3A l 40 80 mA Current Limit VIN = 5V, VCONTROL = 5V, VSET = 0V, VOUT = –0.1V l 3 3.7 A Error Amplifier RMS Output Noise (Note 6) ILOAD = 500mA, 10Hz ≤ f ≤ 100kHz, COUT = 10µF, CSET = 40 µVRMS 0.1µF Reference Current RMS Output Noise (Note 6) 10Hz ≤ f ≤ 100kHz 1 nARMS Ripple Rejection f = 120Hz 85 dB VRIPPLE = 0.5VP-P, IL = 0.1A, CSET = 0.1µF, f = 10kHz 75 dB COUT = 10µF f = 1MHz 20 dB Thermal Regulation, ISET 10ms Pulse 0.003 %/W
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
The VCONTROL pin current is the drive current required for the may cause permanent damage to the device. Exposure to any Absolute output transistor. This current will track output current with roughly a 1:60 Maximum Rating condition for extended periods may affect device ratio. The minimum value is equal to the quiescent current of the device. reliability and lifetime.
Note 6:
Output noise is lowered by adding a small capacitor across the
Note 2:
Unless otherwise specified, all voltages are with respect to VOUT. voltage setting resistor. Adding this capacitor bypasses the voltage setting The LT3083 is tested and specified under pulse load conditions such that resistor shot noise and reference current noise; output noise is then equal TJ ≅ TA. The LT3083E is 100% tested at TA = 25°C and performance is to error amplifier noise (see the Applications Information section). guaranteed from 0°C to 125°C. Performance of the LT3083E over the
Note 7:
The SET pin is clamped to the output with diodes through 1k full –40°C to 125°C operating junction temperature range is assured by resistors. These resistors and diodes will only carry current under design, characterization, and correlation with statistical process controls. transient overloads. The LT3083I regulators are guaranteed over the full –40°C to 125°C
Note 8:
Load regulation is Kelvin sensed at the package. operating junction temperature range. The LT3083MP is 100% tested and guaranteed over the –55°C to 125°C operating junction temperature range.
Note 9:
Current limit includes foldback protection circuitry. Current limit decreases at higher input-to-output differential voltages.
Note 3:
Minimum load current is equivalent to the quiescent current of the part. Since all quiescent and drive current is delivered to the output
Note 10:
This IC includes overtemperature protection that is intended of the part, the minimum load current is the minimum current required to to protect the device during momentary overload conditions. Junction maintain regulation. temperature will exceed the maximum operating junction temperature when overtemperature protection is active. Overtemperature protection
Note 4:
For the LT3083, dropout is caused by either minimum control (thermal limit) is typically active at junction temperatures of 165°C. voltage (VCONTROL) or minimum input voltage (VIN). Both parameters are Continuous operation above the specified maximum operating junction specified with respect to the output voltage. The specifications represent temperature may impair device reliability. the minimum input-to-output differential voltage required to maintain regulation. Rev. B 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts