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TPS2849 Datasheet(PDF) 1 Page - Texas Instruments |
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TPS2849 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 20 page TPS2838, TPS2839 TPS2848, TPS2849 SLVS367A – MARCH 2001 – REVISED JUNE 2001 SYNCHRONOUSBUCK MOSFET DRIVERS WITH DRIVE REGULATOR 1 www.ti.com FEATURES D Integrated Drive Regulator (4 V to 14 V) D Adjustable/Adaptive Dead-Time Control D 4-A Peak current at VDRV of 14 V D 10-V to 15-V Supply Voltage Range D TTL-Compatible Inputs D Internal Schottky Diode Reduces Part Count D Synchronous or Nonsynchronous Operation D Inverting and Noninverting Options D TSSOP PowerPad Package for Excellent Thermal Performance APPLICATIONS D Single or Multiphase Synchronous-Buck Power Supplies D High-Current DC/DC Power Modules DESCRIPTION The TPS2838/39/48/49 devices are MOSFET drivers designed for high-performance synchronous power supplies. The drivers can source and sink up to 4-A peak current at a 14-V drive voltage. These are ideal devices to use with power supply controllers that do not have on-chip drivers. The low-side driver is capable of driving loads of 3.3 nF in 10-ns rise/fall times and has 40-ns propagation delays at room temperature. The MOSFET drivers have an integrated 150-mA regulator, so the gate drive voltage can be optimized for specific MOSFETs. The TPS2848 and TPS2849 have a fixed 8-V drive regulator, while the TPS2838/39 allow the drive regulator to be adjusted from 4 V to 14 V by selection of two external resistors. The devices feature VDRV to PGND shoot- through protection with adaptive/adjustable deadtime control. The deadtime, for turning on the high-side FET from LOWDR transitioning low, is adjustable with an external capacitor on the DELAY pin. This allows compensation for the effect the gate resistor has on the synchronous FET turn off. The adaptive deadtime prevents the turning on of the low-side FET until the voltage on the BOOTLO pin falls below a threshold after the high-side FET stops conducting. The high-side drive can be configured as a ground referenced driver or a floating bootstrap driver. The internal Schottky diode minimizes the size and number of external components needed for the bootstrap driver circuit. Only one external ceramic capacitor is required to configure the bootstrap driver. 1 2 3 4 5 6 7 14 13 12 11 10 9 8 ENABLE IN PWRRDY DELAY NC DT AGND BOOT HIGHDR BOOTLO VCC VDRV LOWDR PGND Thermal Pad TPS2848, TPS2849 PWP PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ENABLE IN PWRRDY DELAY SYNC ADJ DT AGND BOOT HIGHDR BOOTLO VCC VDRV LOWDR NC PGND Thermal Pad TPS2838, TPS2839 PWP PACKAGE (TOP VIEW) ACTUAL SIZE (5,1 mm x 6,6 mm) ACTUAL SIZE (5,1 mm x 6,6 mm) PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 2001, Texas Instruments Incorporated PowerPAD is a trademark of Texas Instruments. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. |
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Descripción similar - TPS2849 |
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