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UCD7242RSJT Datasheet(PDF) 1 Page - Texas Instruments |
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UCD7242RSJT Datasheet(HTML) 1 Page - Texas Instruments |
1 / 33 page BP3 GND T MON V IN PWM-B SRE-B FLT-B V DIS GG I -B MON BST-B BSW-B SW-B PGND PWM-A SRE-A FLT-A I -A MON BST-A BSW-A SW-A PGND V GG UCD7242 www.ti.com SLUS962 – JANUARY 2010 Digital Dual Synchronous-Buck Power Driver Check for Samples: UCD7242 1 FEATURES APPLICATIONS • Digitally-Controlled Synchronous-Buck Power • Fully Integrated Power Switches With Drivers Stages for Dual Synchronous Buck Converters • High Current Dual-Phase VRM/EVRD • Full Compatibility With TI Fusion Digital Power Regulators for Desktop, Server, Telecom and Supply Controllers, Such as the UCD92xx Notebook Processors 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%) DESCRIPTION The UCD7242 is a complete power system ready to drive two independent buck power supplies (see Figure 1). 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. 1 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. PRODUCTION DATA information is current as of publication date. Copyright © 2010, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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