LT1269 Linear Technology, LT1269 Datasheet
LT1269
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LT1269 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
... C Hi Clamp Clamp 1. 0.8V IN MAX, C 0. 0.6V IN MAX C ORDER PART NUMBER TOP VIEW LT1269CS GND 5 16 GND POWER SWITCH 6 15 GND 7 14 GND PACKAGE ...
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 ...
Page 4
... LT1271/LT1269 W U TYPICAL PERFOR A Switch Current Limit vs Duty Cycle 12 9 – 125 100 DUTY CYCLE (%) O U TYPICAL A PPLICATI OPTIONAL INTPUT FILTER L3 V –12V HARA TERISTICS C 1271/69 G01 S Negative-to-Positive Buck-Boost Converter L1** ...
Page 5
... LT1271/LT1269 12V 0.5A 100 F 25V 1271/69 TA03 0.165 – 0.180 0.045 – 0.055 (4.191 – 4.572) (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 – ...
Page 8
... LT1271/LT1269 U TYPICAL APPLICATION C3* 100 F OPTIONAL INTPUT FILTER –8V TO –30V RELATED PARTS PART NUMBER DESCRIPTION LT1171 100kHz, 2.5A Boost Switching Regulator LT1370 500kHz, 6A Boost Switching Regulator LT1371 500kHz, 3A Boost Switching Regulator LT1372 500kHz, 1.5A Boost Switching Regulator LT1374 500kHz, 4.5A Buck Switching Regulator LT1376 500kHz, 1 ...