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LT3434IFE Datasheet(PDF) 1 Page - Linear Technology |
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LT3434IFE Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT3434 1 3434f APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO ■ High Voltage Power Conversion ■ 14V and 42V Automotive Systems ■ Industrial Power Systems ■ Distributed Power Systems ■ Battery-Powered Systems ■ Wide Input Range: 3.3V to 60V ■ 3A Peak Switch Current ■ Burst Mode ® Operation: 100µA Quiescent Current** ■ Low Shutdown Current: IQ < 1µA ■ Power Good Flag with Programmable Threshold ■ Load Dump Protection to 60V ■ 200kHz Switching Frequency ■ Saturating Switch Design: 0.1Ω ■ Peak Switch Current Maintained Over Full Duty Cycle Range* ■ 1.25V Feedback Reference Voltage ■ Easily Synchronizable ■ Soft-Start Capability ■ Small 16-Pin Thermally Enhanced TSSOP Package High Voltage 3A, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current The LT ®3434 is a 200kHz monolithic buck switching regulator that accepts input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Innovative design techniques integrated in a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by employing Burst Mode operation at low currents, utilizing the output to bias the internal circuitry, and by using a supply boost capacitor to fully saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range.* Shutdown reduces input supply current to less than 1µA. External synchronization can be implemented by driving the SYNC pin with logic-level inputs. A single capacitor from the CSS pin to the output provides a controlled output voltage ramp (soft-start). The device also has a power good flag with a programmable threshold and time-out, and thermal shutdown protection. The LT3434 is available in a 16-pin TSSOP package with exposed pad leadframe for low thermal resistance. 14V to 3.3V Step-Down Converter with 100µA No Load Quiescent Current Efficiency and Power Loss vs Load Current LOAD CURRENT (A) 0.0001 0 25 0.001 0.01 0.1 1 3434 TA02b 100 50 75 0.001 0.01 10 0.1 1 10 VOUT = 5V VOUT = 3.3V TYPICAL POWER LOSS EFFICIENCY VIN = 12V L = 33µH COUT = 100µF Supply Current vs Input Voltage INPUT VOLTAGE (V) 0 0 50 100 10 20 30 40 3434 TA02a 50 150 25 75 125 60 VOUT = 3.3V VIN SHDN VC VBIAS FB PGFB PG LT3434 4.7µF 100V CER 470pF 0.68µF 0.1µF 33µH 4148 1µF SYNC CT GND 100µF 6.3V TANT VOUT 3.3V 2A VIN 30MQ100 4700pF 10k 165k 1% 100k 1% 3434 TA01 27pF SW BOOST CSS , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Burst Mode is a registered trademark of Linear Technology Corporation. *Protected by U.S. Patents including 6498466. **See Burst Mode Operation section for conditions. |
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