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LTC1438XCG Datasheet(PDF) 9 Page - Linear Technology |
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LTC1438XCG Datasheet(HTML) 9 Page - Linear Technology |
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9 / 32 page  9 LTC1438/LTC1439 PIN FUNCTIONS 12V operation. When used as a comparator, this is the noninverting input of a comparator whose inverting input is tied to the internal 1.19V reference. See Auxiliary Regu- lator Application section. AUXON: Pulling this pin high turns on the auxiliary regu- lator/comparator. The threshold is 1.19V. This is a conve- nient linear power supply logic-controlled on/off input. AUXDR: Open Drain Output of the Auxiliary Regulator/ Comparator. The base of an external PNP device is con- nected to this pin when used as a linear regulator. An external pull-up resistor is required for use as a compara- tor. A voltage > 9.5V on AUXDR causes the internal 12V resistive divider to be connected in series with the AUXFB pin. FUNCTIONAL DIAGRA PHASE DETECTOR OSCILLATOR 50k PLLIN** PLL LPF** POWER-ON RESET POR2 LBI RLP VFB2 1.11V CLP COSC COSC fIN BATTERY SENSE 9V 0.6V SFB DROPOUT DETECTOR DUPLICATE FOR SECOND CONTROLLER CHANNEL SWITCH LOGIC 10k LBO AUXDR** AUXFB** SFB1* SFB 1 µA AUXON** VLDO VIN 4.8V VIN EXTVCC INTVCC VREF VFB VSEC – + – + – + – + – + 90.8k + 3 µA 6V 1.19V REF 5V LDO REGULATOR RUN SOFT START INTERNAL SUPPLY SGND *IN SOME VERSIONS, NOT AVAILABLE ON BOTH CHANNELS **NOT AVAILABLE ON LTC1438 †FOLDBACK CURRENT LIMITING OPTION 1438 FD S R Q Q + – – + – + SHUTDOWN INTVCC INTVCC VIN I1 I2 BOOST SENSE + VOSENSE* VOUT ITH VPROG* CC CSS RC RUN/SS SENSE– PGND BG SW TGS** TGL 8k 4k 320k 61k 119k 30k EA 180k 1.28V 1.19V SHUTDOWN 0V CIN CB DB RSENSE COUT • • CSEC + INTVCC + BOLD LINES INDICATE HIGH CURRENT PATHS 2.4V DFB † gm = 1m |
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