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Details, datasheet, quote on part number:TPS2834D
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| Part: | TPS2834D |
| Category: | Power Management => Power Distribution/Switches => MOSFET Drivers => MOSFET and Power Drivers |
| Description: | ti TPS2834, Non-inverting Fast Synchronous Buck MOSFET Drivers With TTL Inputs And Enable |
| Company: | Texas Instruments, Inc. |
| Datasheet: | Download TPS2834D datasheet File size : 234 kB |
| Request For quote: | Find where to buy TPS2834D
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Datasheet text preview:
TPS2834, TPS2835 SYNCHRONOUS-BUCK MOSFET DRIVERS WITH DEAD-TIME CONTROL
SLVS223B NOVEMBER 1999 REVISED AUGUST 2002
D Floating Bootstrap or Ground-Reference D D D D D D D D D D D D
High-Side Driver Adaptive Dead-Time Control 50-ns Max Rise/Fall Times With 3.3-nF Load 2.4-A Typical Output Current 4.5-V to 15-V Supply Voltage Range TTL-Compatible Inputs Internal Schottky Bootstrap Diode SYNC Control for Synchronous or Nonsynchronous Operation CROWBAR for OVP, Protects Against Faulted High-Side Power FETs Low Supply Current....3 mA Typical Ideal for High-Current Single or Multiphase Power Supplies 40°C to 125°C Operating Virtual Junction Temperature Range Available in SOIC and TSSOP PowerPAD Packages
ENABLE IN CROWBAR NC SYNC DT PGND
D PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 14 13 12 11 10 9 8
BOOT NC HIGHDR BOOTLO LOWDR NC VCC
PWP PACKAGE (TOP VIEW)
ENABLE IN CROWBAR NC SYNC DT PGND
1 2 3 Thermal 4 Pad 5 6 7
14 13 12 11 10 9 8
BOOT NC HIGHDR BOOTLO LOWDR NC VCC
NC No internal connection
description
The TPS2834 and TPS2835 are MOSFET drivers for synchronous-buck power stages. These devices are ideal for designing a high-performance power supply using switching controllers that do not include on-chip MOSFET drivers. The drivers are designed to deliver minimum 2-A peak currents into large capacitive loads. The high-side driver can be configured as ground-reference or as floating-bootstrap. An adaptive dead-time control circuit eliminates shoot-through currents through the main power FETs during switching transitions, and provides high efficiency for the buck regulator. The TPS2834 and TPS2835 have additional control functions: ENABLE, SYNC, and CROWBAR. Both high-side and low-side drivers are off when ENABLE is low. The driver is configured as a nonsynchronous-buck driver disabling the low-side driver when SYNC is low. The CROWBAR function turns on the low-side power FET, overriding the IN signal, for overvoltage protection against faulted high-side power FETs. The TPS2834 has a noninverting input, while the TPS2835 has an inverting input. These drivers are available in 14-terminal SOIC and thermally enhanced TSSOP PowerPAD packages and operate over a junction temperature range of 40°C to 125°C. Related Synchronous MOSFET Drivers
DEVICE NAME TPS2830 TPS2831 TPS2832 TPS2833 TPS2836 TPS2837 W/O ENABLE SYNC and CROWBAR ENABLE, SYNC, and CROWBAR TTL W/O ENABLE SYNC and CROWBAR ENABLE, SYNC, and CROWBAR CMOS ENABLE, SYNC, and CROWBAR SYNC and CROWBAR CMOS ADDITIONAL FEATURES INPUTS Noninverted Inverted Noninverted Inverted Noninverted Inverted
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. PowerPAD is a trademark of Texas Instruments Incorporated.
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 2002, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
TPS2834, TPS2835 SYNCHRONOUS-BUCK MOSFET DRIVERS WITH DEAD-TIME CONTROL
SLVS223B NOVEMBER 1999 REVISED AUGUST 2002
AVAILABLE OPTIONS PACKAGED DEVICES TJ 40°C to 125°C SOIC (D) TPS2834D TPS2835D TSSOP (PWP) TPS2834PWP TPS2835PWP
The D and PWP packages are available taped and reeled. Add R suffix to device type (e.g., TPS2834DR)
functional block diagram
8 VCC BOOT
14 (TPS2834 Only) 1 M 250 k 2 IN
12 11
HIGHDR BOOTLO
(TPS2835 Only)
VCC
10 250 k 7
LOWDR
6 DT ENABLE 1 SYNC CROWBAR 3 5
PGND
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
TPS2834, TPS2835 SYNCHRONOUS-BUCK MOSFET DRIVERS WITH DEAD-TIME CONTROL
SLVS223B NOVEMBER 1999 REVISED AUGUST 2002
Terminal Functions
TERMINAL NAME BOOT BOOTLO CROWBAR NO. 14 11 3 I/O I O I DESCRIPTION Bootstrap terminal. A ceramic capacitor is connected between BOOT and BOOTLO to develop the floating bootstrap voltage for the high-side MOSFET. The capacitor value is typically between 0.1 µF and 1 µF. This terminal connects to the junction of the high-side and low-side MOSFETs. CROWBAR can to be driven by an external OVP circuit to protect against a short across the high-side MOSFET. If CROWBAR is driven low, the low-side driver will be turned on and the high-side driver will be turned off, independent of the status of all other control terminals. Dead-time control terminal. Connect DT to the junction of the high-side and low-side MOSFETs. If ENABLE is low, both drivers are off. Output drive for the high-side power MOSFET Input signal to the MOSFET drivers (noninverting input for the TPS2834; inverting input for the TPS2835). Output drive for the low-side power MOSFET No internal connection Power ground. Connect to the FET power ground. I I Synchronous 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. Input supply. Recommended that a 1-µF capacitor be connected from VCC to PGND.
DT ENABLE HIGHDR IN LOWDR NC PGND SYNC VCC
6 1 12 2 10 4, 9, 13 7 5 8
I I O I O
detailed description
low-side driver The low-side driver is designed to drive low rDS(on) N-channel MOSFETs. The current rating of the driver is 2 A, source and sink. high-side driver The high-side driver is designed to drive low rDS(on) N-channel MOSFETs. The current rating of the driver is 2 A, source and sink. The high-side driver can be configured as a GND-reference driver or as a floating bootstrap driver. The internal bootstrap diode is a Schottky, for improved drive efficiency. The maximum voltage that can be applied from BOOT to ground is 30 V. dead-time (DT) control Dead-time control prevents shoot-through current from flowing through the main power FETs during switching transitions by controlling the turnon times of the MOSFET drivers. The high-side driver is not allowed to turn on until the gate drive voltage to the low-side FET is low, and the low-side driver is not allowed to turn on until the voltage at the junction of the power FETs (Vdrain) is low; the TTL-compatible DT terminal connects to the junction of the power FETs. ENABLE The ENABLE terminal enables the drivers. When enable is low, the output drivers are low. ENABLE is a TTL-compatible digital terminal. IN The IN terminal is a TTL-compatible digital terminal that is the input control signal for the drivers. The TPS2834 has a noninverting input; the TPS2835 has an inverting input.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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