Digital Dual Synchronous Buck Power Driver
Product details
Parameters
Package | Pins | Size
Features
- Fully Integrated Power Switches With Drivers
for Dual Synchronous Buck Converters - Full Compatibility With TI Fusion Digital Power Supply
Controllers, Such as the UCD92xx Family - Wide Input Voltage Range: 4.75 V to 18 V
Operational Down to 2.2 V Input With an External Bias Supply - Up to 10A Output Current per Channel
- Operational to 2 MHz Switching Frequency
- High Side Current Limit With Current Limit Flag
- Onboard Regulated 6 V Driver Supply From VIN
- Thermal Protection
- Temperature Sense Output – Voltage Proportional to Chip Temperature
- UVLO and OVLO Circuits Ensure Proper Drive Voltage
- Rated From –40°C to 125°C Junction Temperature
- RoHS Compliant
- Accurate On-Die Current Sensing (±5%)
- APPLICATIONS
- Digitally-Controlled Synchronous-Buck Power Stages
- High Current Dual-Phase VRM/EVRD Regulators for Desktop, Server, Telecom and
Notebook Processors
Description
The UCD7242 is a complete power system ready to drive two independent buck power supplies. High side MOSFETs, low side MOSFETs, drivers, current sensing circuitry and necessary protection functions are all integrated into one monolithic solution to facilitate minimum size and maximum efficiency. Driver circuits provide high charge and discharge current for the high-side NMOS switch and the low-side NMOS synchronous rectifier in a synchronous buck circuit. The MOSFET gates are driven to +6.25 V by an internally regulated VGG supply. The internal VGG regulator can be disabled to permit the user to supply an independent gate drive voltage. This flexibility allows a wide power conversion input voltage range of 2.2V to 18V. Internal under voltage lockout (UVLO) logic ensures VGG is good before allowing chip operation.
The synchronous rectifier enable (SRE) pin controls whether or not the low-side MOSFET is turned on when the PWM signal is low. When SRE is high the part operates in continuous conduction mode for all loads. In this mode the drive logic block uses the PWM signal to control both the high-side and low-side gate drive signals. Dead time is also optimized to prevent cross conduction. When SRE is low, the part operates in discontinuous conduction mode at light loads. In this mode the low-side MOSFET is always held off.
On-board comparators monitor the current through the high side switch to safeguard the power stage from sudden high current loads. Blanking delay is set for the high side comparator to avoid false reports coincident with switching edge noise. In the event of an over-current fault, the high-side FET is turned off and the Fault Flag (FLT) is asserted to alert the controller.
MOSFET current is measured and monitored by a precision integrated current sense element. This method provides an accuracy of ±5% over most of the load range. The amplified signal is available for use by the controller on the IMON pin.
An on-chip temperature sense converts the die temperature to a voltage at the TMON pin for the controller’s use. If the die temperature exceeds 170°C, the temperature sensor initiates a thermal shutdown that halts output switching and sets the FLT flag. Normal operation resumes when the die temperature falls below the thermal hysteresis band.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | Digital Dual Synchronous-Buck Power Driver.. datasheet (Rev. B) | Aug. 12, 2012 |
Selection guide | Power Management Guide 2018 (Rev. R) | Jun. 25, 2018 | |
User guide | Using the UCD9224EVM-464 | Aug. 12, 2010 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Software development
Features
Some of the tasks you can perform with the GUI include:
- Turn on or off the power supply output, either through the hardware control line or the PMBus OPERATION command
- Monitor real-time data. Items such as input voltage, output voltage, output current, temperature, and warnings/faults are continuously (...)
The MFR GUI supports the same devices as Fusion Digital Power Designer software. This tool is typically used in manufacturing (...)
Features
Some of the tasks the tool can perform include:
- Download/Upgrade firmware
- Program a device configuration
- Calibrate a device (manually or instrumented via GPIB):
- Input voltage (Vin)
- Output voltage (Vout)
- Output current (Iout)
- Temperature
- Test the device (validate power conversion falls within acceptable Vout (...)
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Reference designs
Design files
-
download PMP20481 BOM.pdf (68KB) -
download PMP20481 Assembly Drawing.pdf (38KB) -
download PMP20481 PCB.pdf (222KB) -
download PMP20481 Gerber.zip (155KB)
Design files
-
download Using the TMS320C6657 to Implement Efficient OPUS Codec Solution BOM.pdf (191KB) -
download Using the TMS320C6657 to Implement Efficient OPUS Codec Solution PCB.zip (4763KB) -
download Using the TMS320C6657 to Implement Efficient OPUS Codec Solution CAD Files.zip (1728KB) -
download Using the TMS320C6657 to Implement Efficient OPUS Codec Solution Gerber.zip (9013KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
VQFN-HR (RSJ) | 32 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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