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LT1976 Datasheet(PDF) 1 Page - Linear Technology |
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LT1976 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT1976 1 1976f s High Voltage Power Conversion s 14V and 42V Automotive Systems s Industrial Power Systems s Distributed Power Systems s Battery-Powered Systems , LTC and LT are registered trademarks of Linear Technology Corporation. s Wide Input Range: 3.3V to 60V s 1.5A Peak Switch Current s Burst Mode ® Operation: 100 µA Quiescent Current** s Low Shutdown Current: IQ < 1µA s Power Good Flag with Programmable Threshold s Load Dump Protection to 60V s 200kHz Switching Frequency s Saturating Switch Design: 0.2 Ω On-Resistance s Peak Switch Current Maintained Over Full Duty Cycle Range* s 1.25V Feedback Reference Voltage s Easily Synchronizable s Soft-Start Capability s Small 16-Pin Thermally Enhanced TSSOP Package High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100 µA Quiescent Current Burst Mode is a registered trademark of Linear Technology Corporation. *U.S. Patent 6,498,466 **See Burst Mode Operation section for conditions The LT ®1976 is a 200kHz monolithic buck switching regulator that accepts input voltages up to 60V. A high efficiency 1.5A, 0.2 Ω switch is included on the die along with all the necessary oscillator, control and logic cir- cuitry. Current mode topology is used for fast transient response and good loop stability. Innovative design techniques along with a new high volt- age 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 1 µA. 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 LT1976 is available in a 16-pin TSSOP package with exposed pad leadframe for low thermal resistance. VIN SHDN VC BOOST VBIAS FB PGFB PG LT1976 4.7 µF 100V CER 100pF 0.33 µF 0.1 µF 33 µH 4148 1 µF SYNC CT GND 100 µF 6.3V TANT VOUT 3.3V 1A VIN 3.3V TO 60V 10MQ100N 0.047 µF 12.5k 165k 1% 100k 1% 1976 TA01 27pF SW CSS 14V to 3.3V Step-Down Converter with 100 µA No Load Quiescent Current Efficiency vs Load Current LOAD CURRENT (A) 0.0001 0 20 40 60 0.001 0.01 0.1 1 1976 TA02 80 100 10 30 50 70 90 10 VOUT = 5V VOUT = 3.3V TA = 25°C Supply Current vs Input Voltage INPUT VOLTAGE (V) 0 0 50 100 10 20 30 40 1976 F05 50 150 25 75 125 60 VOUT = 3.3V TA = 25°C DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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