The SZDL3105BB-EVB02 buck converter design example is configured for a 5 V to 20V at5 A output and integrates all necessary connections to properly test and evaluate the efficiency and other performance metrics of the Silanna SZDL3105B fully-integrated DC/DC converter. A range of compatible daughter boards ensures rapid configuration of a variety of USB-PD and QC charging use cases.
The SZDL3105BB-EVB02, which is pre-configured for operation with inputs from 7.5 V to 24 V, may be evaluated as a general-purpose point of load (POL) application or in-circuit with a USB port controller. Available daughterboards feature Weltrend WT6633P (Qualcomm QC2/3/4, USB-PD), Power Integrations CHY103 (Qualcomm QC3) and Cypress CYPD3175 (Qualcomm QC4, USB-PD) controllers.
“OEMs are looking to develop the smallest, lightest, high-power USB-PD and QC fast chargers within tight time-to-market deadlines,” says Ahsan Zaman, Silanna Semiconductor’s director of product marketing. “By speed the evaluation of our industry-leading buck converters in a variety of different scenarios this evaluation board and the associated daughter boards help to reduce the time from design and prototyping to final production.”
Operating at a switching speed of 667 kHz, the SZDL3105B DC/DC converter measures just 4 mm x 4mm yet delivers up to 5 A and 100 W. The device accommodates inputs up to 27 VDC and features an extremely low operating power dissipation that enables the very low no-load power that is an important specification for regulatory certification. Internal and external feedback resistor divider flexibility supports custom design, while a momentary internal feedback path allows for clean and well-controlled start-up operation until external USB port controllers can bias themselves and smoothly take over control of the output voltage.
SZDL3105BB-EVB02 features
- Programmable switching frequency up to 2 MHz
- 95% Peak Efficiency as shipped
- 5A output with overcurrent protection
- Wide input voltage from 7. V to 24V
- UVLO/OCP/OVP/OTP protections
- All-ceramic output capacitor solution
- Adaptive COT architecture for fast load transient response
- Internal LDO for MOSFET driver bias
- Pre-bias startup with programmable soft start time
- Diode emulation mode for light load efficiency boost
- Compact 4 x 4 mm QFN package
Applications
- USB-PD, QC2/3/4 DC/DC Converters
