lt3050 Linear Technology Corporation, lt3050 Datasheet
lt3050
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lt3050 Summary of contents
Page 1
... The current monitor function sources a current equal to 1/100th of output current. A logic FAULT pin asserts low if the LT3050 is in current limit, operating below its minimum output current (open-circuit thermal shutdown. The LT3050 optimizes stability and transient response with low ESR ceramic capacitors, requiring a minimum of 2.2μ ...
Page 2
... LT3050IDDB#TRPBF LEAD BASED FINISH TAPE AND REEL LT3050EMSE LT3050EMSE#TR LT3050IMSE LT3050IMSE#TR LT3050MPMSE LT3050MPMSE#TR LT3050EDDB LT3050EDDB#TR LT3050IDDB LT3050IDDB#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. For more information on lead free part marking, go to: For more information on tape and reel specifi ...
Page 3
... 2.26K IN OUT IMAX FAULT Pin Threshold 5.6V < V < 15V 5V 1.5K IN OUT IMAX FAULT Pin Threshold 5.6V < V < 15V 5V 1.15K IN OUT IMAX FAULT Pin Threshold LT3050 MIN TYP MAX l 1.6 2.2 594 600 606 l 588 612 l 0. 0.2 4 110 150 l 220 ...
Page 4
... The LT3050MP is 100% tested over the –55°C to 125°C operating junction temperature range. Note 3: The LT3050 is tested and specifi ed for these conditions with ADJ pin connected to the OUT pin. Note 4: Maximum junction temperature limits operating conditions. ...
Page 5
... TEMPERATURE (°C) 3050 G05 GND Pin Current vs I LOAD 5 5. OUT 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0 100 I (mA) LOAD 3050 G08 LT3050 Dropout Voltage 600 550 I = 100mA L 500 450 I = 50mA L 400 350 I = 10mA 300 L 250 200 I = 1mA L 150 100 50 0 – ...
Page 6
... LT3050 TYPICAL PERFORMANCE CHARACTERISTICS SHDN Pin Input Current 3 45V SHDN 2.5 2.0 1.5 1.0 0.5 0 –75 –50 – 100 125 150 175 TEMPERATURE (°C) 3050 G10 Internal Current Limit 350 V = 12V OUT 300 250 200 150 100 50 0 –75 –50 – 100 125 150 175 TEMPERATURE (° ...
Page 7
... V = 1.5V OUT OUT OUT 10 0 100 0.01 0 LOAD CURRENT (mA) LT3050 T = 25°C, unless otherwise noted. J Minimum Input Voltage 2.2 2.0 = 10nF 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 –75 –50 – 100 125 150 175 TEMPERATURE (°C) 3050 G19a Output Noise Spectral Density vs C REF/BYP ...
Page 8
... LT3050 TYPICAL PERFORMANCE CHARACTERISTICS 5V 10Hz to 100kHz Output Noise REF/BYP V OUT 500μV/DIV 3050 G27 C = 10μF 1ms/DIV OUT I = 100mA L Transient Response (Load Dump) V OUT 20mV/DIV OUT 50mA OUT 10V/DIV C = 2.2μF OUT 1ms/DIV 3050 G29 External Current Limit ...
Page 9
... IMON IMON 93 92 125 100 I (mA) OUT 125°C 25°C –55°C 100 125 3050 G42 LT3050 T = 25°C, unless otherwise noted. J Minimum Output Current Threshold R = 110k IMIN 1.100 OUT 1.075 1.050 1.025 V = 15V 12V 1.000 ...
Page 10
... V SHDN (Pin 4): Shutdown. Pulling the SHDN pin low puts the LT3050 into a low power state and turns the output off. Drive the SHDN pin with either logic or an open collector/drain with a pull-up resistor. The resistor supplies the pull-up ...
Page 11
... CURRENT + LIMIT AMPLIFIER ERROR AMPLIFIER + – I MIN COMPARATOR + 600mV – REFERENCE GND REF/BYP 10 LT3050 MON th that of the output current. pin, please see the Operation section. MON pin is not used, it must MON MIN MON MAX 1/200 1/100 1/200 ...
Page 12
... I Pin Operation (Current Monitor) MON The I pin is the collector of a PNP which mirrors the MON LT3050 output PNP at a ratio of 1:100 (see block diagram on page 11). The current sourced by the I th ~1/100 of the current sourced by the OUT pin when the I and OUT pin voltages are equal and the device is not MON operating in dropout ...
Page 13
... External Programmable Current Limit (I The I pin is the collector of a PNP which mirrors the MAX LT3050 output at a ratio of approximately 1:200 (see Block Diagram). The I pin is also the input to the precision MAX current limit amplifi er. If the output load increases to the point where it causes the I pin voltage to reach 0 ...
Page 14
... In battery backup applications where the output is held backup battery and the input is pulled to ground, the LT3050 acts like it has a diode in series with its output and prevents reverse current fl ow. Adjustable Operation The LT3050 has an output voltage range of 0.6V to 44.5V. ...
Page 15
... Output Capacitance and Transient Response The LT3050 regulator is stable with a wide range of output capacitors. The ESR of the output capacitor affects stability, most notably with small capacitors. Use a minimum output R2 (kΩ) capacitor of 2.2μ ...
Page 16
... F03 to recover. Other regulators, such as the LT1083/LT1084/ LT1085 family and LT1764A also exhibit this phenomenon not unique to the LT3050. The problem occurs with a heavy output load when the input voltage is high and the output voltage is low. Common situations are: immediately after the removal of a short-circuit or if the shutdown pin is pulled high after the input voltage is already turned on ...
Page 17
... The dual-in-line pin arrangement allows metal to extend beyond the ends of the package on the topside (component side PCB. Connect this metal to GND on the PCB. The multiple IN and OUT pins of the LT3050 also assist in spreading heat to the PCB. For surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the PC board and its copper traces ...
Page 18
... IN is powered, the output may turn on. SHDN pin logic cannot be referenced to a negative rail. 18 The LT3050 incurs no damage if its output is pulled below ground. If the input is left open-circuit or grounded, the output can be pulled below ground by 50V. No current fl ows through the pass transistor from the output. ...
Page 19
... TYP MSOP (MSE12) 0608 REV B (.0256) BSC 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX LT3050 R = 0.115 0.40 ± 0.10 TYP TYP PIN ...
Page 20
... McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● IN OUT 1% SHDN 2.2μF 120k 442k FAULT ADJ 1% 60.4k LT3050 I MAX I MON 3k (ADC FULL SCALE = 3V) I MIN REF/BYP 10nF GND COMMENTS 300mV Dropout Voltage, Low Noise: 20μV 300mV Dropout Voltage, Low Noise: 20μV 300mV Dropout Voltage, Low Noise: 20μ ...