lt8415 Linear Technology Corporation, lt8415 Datasheet
lt8415
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lt8415 Summary of contents
Page 1
... OUT down. High value (12.4M/0.4M) resistors are integrated on chip for output voltage detection, signifi cantly reducing input referred quiescent current. The LT8415 also features a comparator built into the SHDN pin, overvoltage protection for the CAP, V and comes in a tiny 12-pin 3mm × 2mm DFN package. ...
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... LT8415EDDB#PBF LT8415EDDB#TRPBF LT8415IDDB#PBF LT8415IDDB#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi ...
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... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT8415 is guaranteed to meet performance specifi cations from 0°C to 125°C junction temperature. Specifi cations over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls ...
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... LT8415 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage vs Temperature 3.6V 16V CC OUT LOAD = 0.5mA 0.75 FIGURE 4 CIRCUIT 0.5 0.25 0 – 0.25 – 0.5 – 0.75 –1 – TEMPERATURE (°C) 8415 G04 Quiescent Current vs SHDN Voltage 3. SHDN VOLTAGE (V) 8415 G07 Peak Inductor Current ...
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... FALL TIME 3 2 FALL DELAY LOAD = 220pF 3.6V 34V CC OUT FRONT PAGE APPLICATION 0 120 – TEMPERATURE (°C) LT8415 T = 25°C, unless otherwise noted. A SHDN Minimum Input Voltage High vs Temperature 1.5 1.4 SHDN RISING 1.3 SHDN FALLING 1.2 1 – TEMPERATURE (°C) 8415 G14 Start-Up Waveforms With 0.1μ ...
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... LT8415 PIN FUNCTIONS SHDN (Pin 1): Shutdown Pin. This pin is used to enable/dis- able the chip. Drive below 0.3V to disable the chip. Drive above 1.4V to activate the chip. Do not fl oat this pin. V (Pin 2): Input Supply Pin. Must be locally bypassed CC to GND. See typical applications section. ...
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... OUT1,OUT2 VOLTAGE 0V OPERATION Switching Regulator The LT8415 utilizes a variable peak current, variable off- time control scheme to provide high effi ciency over a wide output current range. The operation of the part can be better understood by referring to the Block Diagram. The part senses the output voltage by monitoring the internal FB node, and servoing the FB node voltage to be equal to the FBP pin voltage ...
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... LT8415 APPLICATIONS INFORMATION Inductor Selection Several inductors that work well with the LT8415 are listed in Table 1. The tables are not complete, and there are many other manufacturers and devices that can be used. Consult each manufacturer for more detailed information and for their entire selection of related parts, as many different sizes and shapes are available ...
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... V is used at the CAP pin, inrush current should be measured − ensure safe operation. mA Soft-Start The LT8415 contains a soft-start circuit to limit peak switch currents during start-up. High start-up current is inherent in switching regulators in general since the feedback loop < RIPPLE ...
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... LT8415 APPLICATIONS INFORMATION If the application doesn’t require the output disconnect function, the CAP and V pin can be shorted, and higher OUT power converter effi ciency can be achieved. SHDN Pin Comparator and Hysteresis Current An internal comparator compares the SHDN pin voltage with an internal voltage reference (~1.3V) which gives a precise turn-on voltage level ...
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... TYPICAL APPLICATIONS Drive External Capacitors to 34V/0V with the LT8415 100μH 2.5V to 16V C2 C1 22nF 2.2μF SW CAP OUT LT8415 IN 1 OUT 1 LOGIC LEVEL IN 2 OUT 2 V CHIP REF SHDN ENABLE R1 137K GND FBP R2 887K C1: 2.2μF, 16V, X5R, 0603 C2: 22nF, 100V, X5R, 0603 C3: 0.1μ ...
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... C1: 2.2μF, 16V, X5R, 0603 C2: 0.1μF, 25V, X5R, 0603 C3: 0.1μF, 25V, X5R, 0603* C4: 0.1μF, 16V, X7R, 0402 L1: MURATA LQH32CN101K53 * HIGHER CAPACITANCE VALUE IS REQUIRED FOR C3 WHEN THE V Figure 4. Drive External Capacitors to 16V/0V with the LT8415 RELATED PARTS PART NUMBER DESCRIPTION LT1930/LT1930A 1.2MHz/2.2MHz, High Effi ciency Step-Up DC/DC ...