LT3433 LINER [Linear Technology], LT3433 Datasheet
LT3433
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LT3433 Summary of contents
Page 1
... A and maintains high efficiencies with light loads. Current limit foldback and frequency foldback help pre- vent inductor current runaway during start-up. Program- mable soft-start helps prevent output overshoot at start-up. The LT3433 is available in a 16-lead thermally enhanced TSSOP package. V OUT ...
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... SW_H Switch Voltage .................................. – 60V SW_L Switch Voltage ............................... – 0.3V to 30V Feedback Voltage (V ) ............................... – 0. Operating Junction Temperature Range (Note 5) LT3433E (Note 6) ............................ – 125 C LT3433I ........................................... – 125 C Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL CHARACTERISTICS The ...
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... CC from 125 C junction temperature. Specifications over the – 125 C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3433I is guaranteed over the full – 125 C operating junction temperature range. V Output Voltage BIAS vs Temperature 2 ...
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... LT3433 W U TYPICAL PERFOR A CE CHARACTERISTICS Soft-Start Current vs Temperature 7.0 6.5 6.0 5.5 5.0 4.5 4.0 – 100 125 TEMPERATURE ( C) 3433 G03 Oscillator Frequency vs Temperature 210 205 200 195 190 – 100 125 TEMPERATURE ( C) 3433 G06 Maximum Boost Supply Switch Drive Current vs Boost Supply Voltage 70 65 ...
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... SS (Pin 10): Soft Start. Connect a capacitor (C pin to ground. The output voltage of the LT3433 error amplifier corresponds to the peak current sense amplifier output detected before resetting the switch output(s). The ...
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... The V supply only sources current, so forcing this pin BIAS above the regulated voltage allows the use of external power for much of the LT3433 circuitry. When using external drive, 6 this pin should be driven above 3V to assure the internal as: supply is completely disabled. This pin is typically diode- connected to the converter output to maximize conversion efficiency ...
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... Burst Mode CONTROL CONTROL CIRCUITS 1.25V SENSE COMPARATOR BOOSTED CONTROL SLOPE COMP OSCILLATOR 200kHz FREQUENCY CONTROL ERROR AMPLIFIER 30% LOAD 1.231V SHUTDOWN 15% LOAD 5 A SGND 1, 8, 9,16 LT3433 V BIAS 12 BURST BURST_EN 5 BIAS BST 2 DRIVER SW_H 3 SWITCH LOGIC SW_L 15 DRIVER GND ...
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... FB during each switch cycle. This overdrive condition forces the voltage on the V voltage disabled, and the LT3433 shuts down most of its internal circuitry, reducing quiescent current to 100 A. When the voltage on the V returns to normal operation and switching resumes. Antislope Compensation ...
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... As the slope compensation ramp is added to the sensed current, a similar ramp is added to the current limit threshold reference. The end result is that current limit is not compromised so the LT3433 can provide full power regardless of required duty cycle. Mode Switching The LT3433 senses operational duty cycle by directly ...
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... L f • O Inductor Selection The primary criterion for inductor value selection in LT3433 applications is the ripple current created in that inductor. Design considerations for ripple current are the amount of output ripple and the ability of the internal slope compen- sation waveform to prevent current mode instability. ...
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... BSC 4. RECOMMENDED MINIMUM PCB METAL SIZE FOR EXPOSED PAD ATTACHMENT MILLIMETERS (INCHES) *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.150mm (.006") PER SIDE LT3433 IN OUT C4 LT1761-5 0.01 F SHDN BYP GND 3433 TA03 4.90 – ...
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... Synchronous Buck-Boost DC/DC Converter OUT with 95% Efficiency Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 100 H D2 1N4148 V SW_L BST C1 0.1 F SW_H PWRGND LT3433 OUT BURST_EN V BIAS V SHDN C R1 68k SGND 305k 100k ...