TEST REPORT
USB Type-C Dual-Buck Reference Design
Description
This reference design is a USB Type-C® dual-output buck with 65-W output power and 98.8% efficiency. The design uses two LM61460 buck converters to step down a 21-V input and includes the option for a 5-V bias voltage input to maximize efficiency. The USB Type-C design offers dual-output voltages of 5 V, 9 V, 15 V, and 20 V and was tested using the PMP22426 daughter card. The PMP22426 uses the TPS25740B, a USB Type-C Power Delivery (PD) controller, to control each output separately.
Features
- Two buck converters for dual-port USB Type-C PD
- 98.8% maximum efficiency at 20-V output
- Includes a socket for custom USB PD control cards
- Compact, single-side PCB
Applications
Board Top Side1 Input Characteristics
1.1 DC Input Voltage Requirements
The 5-V bias supply is an optional requirement for output voltages below 15 V. An external bias supply increases efficiency. All tests in this report use the 5-V bias supply.
Table 1-1 Input Requirements
| Parameter | Specifications | Units |
|---|---|---|
| Input Voltage | 21 | VDC |
| Bias Voltage | 5 | VDC |
