| Part number | SY81154UART |
|---|---|
| Channel(#) | 1 |
| Vin (min) (V) | 4.5 |
| Vin (max) (V) | 18 |
| Switching frequency (min)(kHz) | 800 |
| Switching frequency (max)(kHz) | |
| Vout (min) (V) | 0.6 |
| Vout (max) (V) | 9.2 |
| Iout (max) (A) | 4 |
| Vout2 (min)(V) | |
| Vout2 (max )(V) | |
| Iout2 (max)(A) | |
| Vref accuracy (±%) | 1 |
| Vout accuracy(±%) | |
| Control mode | COT+Ripple |
| Duty cycle (max)(%) | 60 |
| Operation mode | USM |
| Iq (typ) (uA) | |
| Features | Hic-cup SCP |
| Package | SOT563 |
| Operating temperature range(°C) | -40°C to 125°C |
| Functional safety category |
· Low RDS(ON) for Internal MOSFETs: 65mΩ Top, 30mΩ Bottom
· Wide Input Voltage Range: 4.5V ~ 18V
· Up to 4A Output Current
· Precise ±1% 0.6V Reference under -40°C~125°C
· Precise EN Threshold
· USM Light Load Operation
· Internal Soft-Start Limits the Inrush Current
· 800kHz Switching Frequency Minimizes the External Components
· Constant On-time and Ripple-Based Control to Achieve Fast Transient Responses
· Cycle-by-Cycle Valley and Peak Current Limit Protection
· Hic-Cup Mode Output Under Voltage Protection
· Auto-Recovery Mode Over Temperature Protection
· Input Under Voltage Lockout (UVLO)
· RoHS-Compliant and Halogen-Free
· Compact Package: SOT563
The SY81154U high efficiency 800kHz synchronous buck converter operates over a wide input voltage range of 4.5V to 18V, and can deliver an output current up to 4A. It integrates a top MOSFET and a bottom MOSFET with very low RDS(ON) to minimize conduction loss. The 800kHz pseudo-constant switching frequency enables using small external inductor and capacitor values.
Photo of evaluation board
Photo of evaluation board
Photo of evaluation board
EVB_SY81154UART is intended for evaluating 4A, 18V, 800kHz synchronous buck converter.
| Title | Date |
|---|---|
| Automotive_Solutions_Q1_2026 | 2026-03-06 |
| Silergy_Catalog_Q1_2026 | 2026-02-09 |
| SOT563 | 2021-09-27 |
