lt1271 Linear Technology Corporation, lt1271 Datasheet
lt1271
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lt1271 Summary of contents
Page 1
... This manual contains a comprehensive discussion of both the LT1070 and the external components used with it, as well as complete formulas for calculating the values of these components. The manual can also be used for the LT1271/LT1269 by factoring in the higher switch current rating and higher operating frequency. ...
Page 2
... V SW LT1269CQ NC GND GND POWER SWITCH GND GND ORDER PART AGND V V NUMBER GND LT1271CT FB LT1269CT V WILL VARY FROM APPROXIMATELY 40 C/W C WITH 0.75 SQ. IN OZ. COPPER TO 46 C/W WITH 0.33 SQ. IN OZ. COPPER V = 15V 0.5V CONDITIONS Measured at Feedback Pin ...
Page 3
... Duty Cycle = 80% LT1271 LT1269 LT1271 LT1269 0.05V IN MAX MAX Note 2: For duty cycles (DC) between 50% and 85%, minimum guaranteed switch current is given by I Note 3: Minimum input voltage. LT1271/LT1269 switch pin open, unless otherwise noted. MIN TYP MAX UNITS 0.7 0.9 1.08 0.5 1.25 0.4 0.45 0.54 15 16.3 17 ...
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... DUTY CYCLE (%) TYPICAL A PPLICATI O U OPTIONAL INTPUT FILTER L3 V –12V 4 C HARA TERISTICS C CE 1271/69 G01 S Negative-to-Positive Buck-Boost Converter L1** 100 C4* LT1271 200 GND 1.24k 2. Switch Saturation Voltage 1 1.4 1.2 1.0 0.8 0.6 0.4 0 ...
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... LT1271/LT1269 12V 0.5A 100 F 25V 1271/69 TA03 0.165 – 0.180 (4.191 – 4.572) 0.045 – 0.055 (1.143 – 1.397) 15 TYP ...
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... LT1271/LT1269 PACKAGE DESCRIPTIO 0.390 – 0.415 (9.906 – 10.541) 0.460 – 0.500 (11.684 – 12.700) 0.057 – 0.077 0.028 – 0.038 (1.448 – 1.956) (0.711 – 0.965 Dimensions in inches (millimeters) unless otherwise noted. T Package 5-Lead Plastic TO-220 (Standard) (LTC DWG # 05-08-1421) 0.147 – ...
Page 7
... NOTE 0.093 – 0.104 (2.362 – 2.642) 0 – 8 TYP 0.050 (1.270) TYP 0.014 – 0.019 (0.356 – 0.482) TYP LT1271/LT1269 0.496 – 0.512 0.394 – 0.419 (10.007 – 10.643 0.037 – 0.045 (0.940 – ...
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... McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com Negative Buck Converter C2 D1 MBR735 100 F L1** 100 LT1271 FB V GND 1.24k * REQUIRED IF INPUT LEADS 2" ** COILTRONICS CTX100-2-52 COMMENTS Good for V 6A, 42V Internal Switch 3A, 42V Internal Switch, 90% Efficiency ...