Datasheet LT3042 (Analog Devices) - 4

LT3042
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current in VIN = 6V 0.3 1 µA Shutdown (VEN/UV = 0V) l 10 µA Internal Current Limit VIN = 2V, VOUT = 0V l 220 270 320 mA (Note 12) VIN = 12V, VOUT = 0V 300 mA VIN = 20V, VOUT = 0V l 130 180 250 mA Programmable Programming Scale Factor: 2V< VIN < 20V (Note 11) 125 mA • kΩ Current Limit VIN = 2V, VOUT = 0V, RILIM = 625Ω l 180 200 220 mA VIN = 2V, VOUT = 0V, RILIM = 2.5kΩ l 45 50 55 mA PGFB Trip Point PGFB Trip Point Rising l 291 300 309 mV PGFB Hysteresis PGFB Trip Point Hysteresis 7 mV PGFB Pin Current VIN = 2V, VPGFB = 300mV 25 nA PG Output Low Voltage IPG = 100µA l 30 100 mV PG Leakage Current VPG = 20V l 1 µA Reverse Input Current VIN = –20V, VEN/UV = 0V, VOUT = 0V, VSET = 0V l 50 µA Reverse Output Current VIN = 0, VOUT = 5V, SET = Open 2 5 µA Minimum Load Required VOUT < 1V l 10 µA (Note 13) Thermal Shutdown TJ Rising 162 °C Hysteresis 8 °C Start-Up Time VOUT(NOM) = 5V, ILOAD = 200mA, CSET = 0.47µF, VIN = 6V, VPGFB = 6V 55 ms VOUT(NOM) = 5V, ILOAD = 200mA, CSET = 4.7µF, VIN = 6V, VPGFB = 6V 550 ms VOUT(NOM) = 5V, ILOAD = 200mA, CSET = 4.7µF, VIN = 6V, RPG1 = 50kΩ, 10 ms RPG2 = 700kΩ (with Fast Start-Up to 90% of VOUT) Thermal Regulation 10ms Pulse –0.01 %/W
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 6:
GND pin current is tested with VIN = VOUT(NOMINAL) and a current may cause permanent damage to the device. Exposure to any Absolute source load. Therefore, the device is tested while operating in dropout. Maximum Rating condition for extended periods may affect device This is the worst-case GND pin current. GND pin current decreases at reliability and lifetime. higher input voltages. Note that GND pin current does not include SET pin
Note 2:
The EN/UV pin threshold must be met to ensure device operation. or ILIM pin current but Quiescent current does include them.
Note 3:
Maximum junction temperature limits operating conditions. The
Note 7:
SET and OUTS pins are clamped using diodes and two 25Ω series regulated output voltage specification does not apply for all possible resistors. For less than 5ms transients, this clamp circuitry can carry combinations of input voltage and output current, especially due to the more than the rated current. Refer to Applications Information for more internal current limit foldback which starts to decrease current limit at information. VIN – VOUT > 12V. If operating at maximum output current, limit the input
Note 8:
Adding a capacitor across the SET pin resistor decreases output voltage range. If operating at the maximum input voltage, limit the output voltage noise. Adding this capacitor bypasses the SET pin resistor’s current range. thermal noise as well as the reference current’s noise. The output noise
Note 4:
OUTS ties directly to OUT. then equals the error amplifier noise. Use of a SET pin bypass capacitor
Note 5:
Dropout voltage is the minimum input-to-output differential also increases start-up time. voltage needed to maintain regulation at a specified output current. The
Note 9:
The LT3042 is tested and specified under pulsed load conditions dropout voltage is measured when output is 1% out of regulation. This such that TJ ≈ TA. The LT3042E is 100% tested at 25°C and performance definition results in a higher dropout voltage compared to hard dropout — is guaranteed from 0°C to 125°C. Specifications over the –40°C to 125°C which is measured when V operating temperature range are assured by design, characterization, and IN = VOUT(NOMINAL). For lower output voltages, below 1.5V, dropout voltage is limited by the minimum input voltage correlation with statistical process controls. The LT3042I is guaranteed specification.
Linear Technology is unable to guarantee maximum
over the full –40°C to 125°C operating temperature range. The LT3042MP
dropout voltage specifications at high currents due to production test
is 100% tested and guaranteed over the full –55°C to 150°C operating
limitations with Kelvin-sensing the package pins.
Please consult the temperature range. The LT3042H is 100% tested at the 150°C operating Typical Performance Characteristics for curves of dropout voltage as a junction temperature. High junction temperatures degrade operating function of output load current and temperature measured in a typical lifetimes. Operating lifetime is derated at junction temperatures greater application circuit. than 125°C. 3042fb 4 For more information www.linear.com/LT3042 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts