TPS2830资料

TPS2830, TPS2831

FAST SYNCHRONOUS-BUCK MOSFET DRIVERS

WITH DEADTIME CONTROL

SLVS196B – JANUARY1999 – REVISED SEPTEMBER 1999

1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265DFloating Bootstrap or Ground-ReferenceHigh-Side DriverDActive Deadtime Control

D50-ns Max Rise/Fall Times and 100-ns MaxPropagation Delay — 3-nF LoadDIdeal for High-Current Single or MutiphaseApplicationsD2.4-A Typ Peak Output Current

D4.5-V to 15-V Supply Voltage Range

DInternal Schottky Bootstrap Diode

DSYNC Control for Synchronous orNonsynchronous OperationDCROWBAR for OVP, Protects AgainstFaulted High-Side Power FETsDLow Supply Current...3-mA Typ

D–40°C to 125°C Junction-TemperatureOperating Range description

The TPS2830 and TPS2831 are MOSFET drivers for synchronous-buck power stages. These devices are idealfor designing a high-performance power supply using a switching controller that does not include suitableMOSFET drivers on the chip. The drivers are designed to deliver 2.4-A peak currents into large capacitive loads.Higher currents can be controlled by using multiple drivers in a multiphase configuration. The high-side drivercan be configured as a ground-reference driver or as a floating bootstrap driver. An adaptive dead-time controlcircuit eliminates shoot-through currents through the main power FETs during switching transitions, andprovides high efficiency for the buck regulator. The TPS2830/31 drivers have additional control functions:ENABLE, SYNC, and CROWBAR. Both drivers are off when ENABLE is low. The driver is configured as anonsynchronous-buck driver when SYNC is low. The CROWBAR function turns on the low-side power FET,overriding the IN signal, for over-voltage protection against faulted high-side power FETs.

The TPS2830 has a noninverting input. The TPS2831 has an inverting input. The TPS2830/31 drivers areavailable in 14-terminal SOIC and TSSOP packages and operate over a junction temperature range of –40°Cto 125°C.

AVAILABLE OPTIONS

PACKAGED DEVICESTJSOIC(D)TSSOP(PWP)

–40°C to 125°CTPS2830DTPS2831DTPS2830PWPTPS2831PWP

The D and PWP packages are available taped and reeled. Add Rsuffix to device type (e.g., TPS2830DR)

Copyright © 1999, Texas Instruments IncorporatedPRODUCTION DATA information is current as of publication date.Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.1234 567141312111098ENABLEINCROWBARNCSYNCDTPGNDBOOTNCHIGHDRBOOTLOLOWDRNCVCCD OR PWP PACKAGE(TOP VIEW)

NC – No internal connection元器件交易网www.cecb2b.comTPS2830, TPS2831

FAST SYNCHRONOUS-BUCK MOSFET DRIVERS

WITH DEADTIME CONTROL

SLVS196B – JANUARY1999 – REVISED SEPTEMBER 1999

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265functional block diagram

DT6INVCC

LOWDRBOOTLOHIGHDRBOOT

PGND28

14

12

11

10VCC

7

ENABLE1SYNC5

CROWBAR3(TPS2830 Only)

(TPS2831 Only)

Terminal Functions

TERMINAL

NAMENO.I/ODESCRIPTION

BOOT14IBootstrap terminal. A ceramic capacitor is connected between BOOT and BOOTLO terminals to developthe floating bootstrap voltage for the high-side MOSFET. The capacitor value is typically between 0.1 µFand 1 µF. A 1-MΩ resistor should be connected across the bootstrap capacitor to provide a discharge pathwhen the driver has been powered down.

BOOTLO11OThis terminal connects to the junction of the high-side and low-side MOSFETs.

CROWBAR3ICROWBAR can to be driven by an external OVP circuit to protect against a short across the high-sideMOSFET. If CROWBAR is driven low, the low-side driver will be turned on and the high-side driver will beturned off, independent of the status of all other control terminals.

DT6IDeadtime control terminal. Connect DT to the junction of the high-side and low-side MOSFETs.

ENABLE1IIf ENABLE is low, both drivers are off.

HIGHDR12OOutput drive for the high-side power MOSFET

IN2IInput signal to the MOSFET drivers (noninverting input for the TPS2830; inverting input for the TPS2831).

LOWDR10OOutput drive for the low-side power MOSFET

NC4, 9, 13

PGND7Power ground. Connect to the FET power ground

SYNC5ISynchronous Rectifier Enable terminal. If SYNC is low, the low-side driver is always off; If SYNC is high,the low-side driver provides gate drive to the low-side MOSFET.

VCC8IInput supply. Recommended that a 1-µF capacitor be connected from VCC to PGND.元器件交易网www.cecb2b.com