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LT1076HVIR Datasheet(PDF) 1 Page - Linear Technology |
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LT1076HVIR Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LT1074/LT1076 1 , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO Step-Down Switching Regulator The LT ®1074 is a 5A (LT1076 is rated at 2A) monolithic bipolar switching regulator which requires only a few external parts for normal operation. The power switch, all oscillator and control circuitry, and all current limit com- ponents, are included on the chip. The topology is a classic s Buck Converter with Output Voltage Range of 2.5V to 50V s Tapped-Inductor Buck Converter with 10A Output at 5V s Positive-to-Negative Converter s Negative Boost Converter s Multiple Output Buck Converter s 5A Onboard Switch (LT1074) s 100kHz Switching Frequency s Greatly Improved Dynamic Behavior s Available in Low Cost 5 and 7-Lead Packages s Only 8.5mA Quiescent Current s Programmable Current Limit s Operates Up to 60V Input s Micropower Shutdown Mode positive “buck” configuration but several design innova- tions allow this device to be used as a positive-to-negative converter, a negative boost converter, and as a flyback converter. The switch output is specified to swing 40V below ground, allowing the LT1074 to drive a tapped- inductor in the buck mode with output currents up to 10A. The LT1074 uses a true analog multiplier in the feedback loop. This makes the device respond nearly instanta- neously to input voltage fluctuations and makes loop gain independent of input voltage. As a result, dynamic behav- ior of the regulator is significantly improved over previous designs. On-chip pulse by pulse current limiting makes the LT1074 nearly bust-proof for output overloads or shorts. The input voltage range as a buck converter is 8V to 60V, but a self- boot feature allows input voltages as low as 5V in the inverting and boost configurations. The LT1074 is available in low cost TO-220 or TO-3 packages with frequency pre-set at 100kHz and current limit at 6.5A (LT1076 = 2.6A). A 7-pin TO-220 package is also available which allows current limit to be adjusted down to zero. In addition, full micropower shutdown can be programmed. See Application Note 44 for design details. A fixed 5V output, 2A version is also available. See LT1076-5. Buck Converter Efficiency Basic Positive Buck Converter + + VSW VIN VC GND FB LT1074 5V 5A C1 500 µF R1 2.8k 1% R2 2.21k 1% MBR745* 10V TO 40V C3 † 200 µF R3 2.7k C2 0.01 µF L1** 50 µH (LT1074) 100 µH (LT1076) USE MBR340 FOR LT1076 COILTRONICS #50-2-52 (LT1074) #100-1-52 (LT1076) PULSE ENGINEERING, INC. #PE-92114 (LT1074) #PE-92102 (LT1076) HURRICANE #HL-AK147QQ (LT1074) #HL-AG210LL (LT1076) RIPPLE CURRENT RATING ≥ IOUT/2 * ** † LT1074•TA01 25V OUTPUT LOAD CURRENT (A) 0 60 70 80 90 12 3 4 LT1074•TPC27 5 6 100 50 L = 50 µH TYPE 52 CORE DIODE = MBR735 V = 5V, V = 15V OUT IN V = 12V, V = 20V OUT IN LT1074 |
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