| Part number | SY21086ABT |
|---|---|
| Channel(#) | 1 |
| Vin (min) (V) | 4.5 |
| Vin (max) (V) | 18 |
| Switching frequency (min)(kHz) | 500 |
| Switching frequency (max)(kHz) | 500 |
| Vout (min) (V) | 0.6 |
| Vout (max) (V) | 9.2 |
| Iout (max) (A) | 2 |
| Vout2 (min)(V) | |
| Vout2 (max )(V) | |
| Iout2 (max)(A) | |
| Vref accuracy (±%) | 1.5 |
| Vout accuracy(±%) | |
| Control mode | COT+Ripple |
| Duty cycle (max)(%) | 75 |
| Operation mode | Auto PFM |
| Iq (typ) (uA) | 200 |
| Features | |
| Package | SOT23-6 |
| Operating temperature range(°C) | -40 to 125 |
| Functional safety category |
· Low RDS(ON) for Internal MOSFETs: 130mΩ Top, 105mΩ Bottom
· Wide Input Voltage Range: 4.5V ~ 18V
· Up to 2A Output Current
· ±1.5% 0.6V Reference
· Precise EN Threshold
· Pulse-Frequency Modulation (PFM) Mode Operation for SY21086
· Forced Continuous Conduction Mode (FCCM) Operation for SY21086E
· Internal Soft-Start Limits the Inrush Current
· Support Smooth Startup with Pre-Biased Output
· 500kHz Switching Frequency Minimizes the External Components
· Constant On-time and Ripple-Based Control to Achieve Fast Transient Responses
· Stable with 10µF COUT
· 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: SOT23-6
The SY21086x is high efficiency synchronous buck converter operates over a wide input voltage range of 4.5V to 18V, and can deliver an output current up to 2A. It integrates a top MOSFET and a bottom MOSFET with very low RDS(ON) to minimize conduction loss. The high pseudo-constant switching frequency enables using small external inductor and capacitor values.
The device uses constant on-time and ripple-based control strategy to achieve fast transient response for applications with high step-down ratios. It also provides cycle-by-cycle current limit protection, output under voltage protection and over temperature protection.
Only the input and output capacitors, inductor, feedback resistor divider and feedforward capacitor need to be selected for the targeted application specifications.
The SY21086x is available in a compact SOT23-6 package.
Photo of evaluation board
Photo of evaluation board
Photo of evaluation board
DB_SY21086xABT_1 is intended for evaluating 2A, 18V, synchronous buck converter.
| Title | Date |
|---|---|
| Automotive_Solutions_Q1_2026 | 2026-02-09 |
| Silergy_Catalog_Q1_2026 | 2026-02-09 |
