Texas Instruments TPS563257 | Demoboard TPS563257EVM

Description

In light-load conditions, the TPS563252 operates in Eco-mode to enable higher efficiency by varying its switching frequency, and the TPS563257 operates in FCCM to maintain constant switching frequency. The main difference is at light loading, but the other behaviors are similar. This user's guide mainly introduces the TPS563252 and includes some TPS563257 features that are different from the TPS563252.The TPS56325x is a single, adaptive on-time, D-CAP3™ control mode, synchronous buck converter that requires a very low external component count. The D-CAP3 control circuit is optimized for low-ESR output capacitors such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The switching frequency is internally set at a nominal 1.4 MHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS56325x package along with the gate-drive circuitry. The low drain-to-source on resistance of the MOSFETs and fast switching slew rate allow the TPS56325x to achieve high efficiency and help keep the junction temperature low at high output currents. Power sequencing is possible by correctly configuring the enable and power-good indicator. The TPS56325x DC/DC synchronous converter is designed to support up to a 3-A continuous current from an input voltage source of 3 V to 16 V. The output voltage range is from 0.6 V to 7 V. Rated input voltage and output current ranges for the evaluation module are given in Table 1-1.The TPS563252EVM evaluation module (EVM) is a single, synchronous buck converter providing 1.05 V at 3 A from 3-V to 16-V input. This user’s guide describes the TPS563252EVM performance.

Features

• Configured for a wide range of applications
• 3-V to 16-V input voltage range
• 0.6-V to 7-V output voltage range
• 0.6-V reference voltage
• ±1% reference accuracy at 25°C
• ±1.5% reference accuracy at –40°C to 125°C
• Integrated 55.2-mΩ and 24.3-mΩ MOSFETs
• 100-μA low quiescent current
• 1.4-MHz switching frequency
• Maximum 93% large duty cycle operation
• Precision EN threshold voltage -1.6-ms fixed typical soft-start time
• Ease of use and small solution size
• TPS563252 Eco-mode, TPS563257 FCCM mode at light loading
• D-CAP3™ control topology
• Easy layout with integrated bootstrap capacitor
• Support start-up with prebiased output
• Open-drain power-good indicator
• Non-latch for OV, OT, and UVLO protection -Hiccup mode for UV protection
• Cycle-by-cycle OC and NOC protection
• 1.6-mm × 1.6-mm SOT-563 package
• Create a custom design using the TPS563252 with the WEBENCH® Power Designer
• Create a custom design using the TPS563257 with the WEBENCH® Power Designer

Typical applications

• WLAN/Wi-Fi access point, switch, router
• Pro-audio, surveillance, drone, DTV, STB and DVR, smart speaker

More information

• Datasheet
• IC product information