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AS1854 Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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AS1854 Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
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10 / 52 page  AS1854/44/34/24 Akros Silicon, Inc. 6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA 408.746.9000 http://www.AkrosSilicon.com 10 Pin Name I/O 1 Description 43 EN3 D, I, PU Hardware enables control for DC-DC regulator #3. A capacitor to ground applied to this input is required for buck reset before start up. This capacitor also sets the regulator delay start time, complimenting the internal fixed soft-start time. If Output #3 is not used, apply a Low (SGND) to this input, and connect FB3 to VP to fully disable the regulator. Secondary-Side: Buck or Boost Controller (Output #4) 45 BUCK_EN D, I Selects between Buck and Boost mode of operation for Output #4. Low = SGND = Boost. High = Buck If Output #4 is not used, tie BUCK_EN to SGND. 33 VBOOST A Boost voltage decoupling node. Decouple with a capacitor to LX4 when Output #4 is in Buck mode. When operating Output #4 in Boost mode, this input should be connected to Output #1. If Output #4 is not used, VBOOST should be tied to VP. 30 HSD4 A High Side external Power FET gate Drive. If Output #4 is not used HSD4 should be left floating with no user connection. 29 LSD4 A Low Side external Power FET gate Drive. If Output #4 is not used LSD4 should be left floating with no user connection. 24 AGND4 P Sense ground for Controller #4, together with FB4 used for differential feedback sensing at the feedback divider. If Output #4 is not used, AGND4 should still be tied to SGND. 27 ISENP4 A Positive current sense input. If Output #4 is not used, ISENP4 should be tied to SGND. 28 ISENN4 A Negative current sense input. If Output #4 is not used, ISENN4 should be tied to SGND. 25 FB4 A Controller voltage feedback input, also used to disable output (see EN4). 42 EN4 D, I, PU Enable control for Controller #4. A capacitor to ground applied to this input is required for proper Controller #4 power-on reset and start up. This capacitor also sets the controller delay start time, complimenting the internal fixed soft-start time. If Output #4 is not used, apply a Low (SGND) to this input, and connect FB4 to VP to fully disable the controller. 26 COMP4 A Controller compensation network connection. If Output #4 is not used COMP4 should be left floating with no user connection. 31 LX4 A Controller switch sense input. If not used (typical for Boost and LED Boost applications) LX4 should be tied to SGND. 32 LX4_SENSE A Remote sense for LX4, used for differential sensing. Should be routed differentially with LX4 (Buck mode). If not used (typical for Boost and LED Boost applications) LX4_SENSE should be tied to SGND. Secondary-Side: I 2C Interface (or I/O in Hardware Mode) 57 SDIO / GPOS OD SDIO in Software mode, used for I 2C bi-directional data input/output. GPOS in Hardware mode, this output reflects the GPIP pin state (from the primary side). 56 SCL / GPIS I / I SCL in Software mode, used as the I 2C clock input. GPIS in Hardware mode is an input that drives the GPOP pin state (on the primary- side). |
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