High Efficiency, 2A, 18V Input Synchronous Buck Converter
![]()
- Parameters
- Features
- Description
| Part number |
SY81057CABT |
| Channel(#) |
1 |
| Vin (min) (V) |
4.5 |
| Vin (max) (V) |
18 |
| Switching frequency (min)(kHz) |
500 |
| Switching frequency (max)(kHz) |
1400 |
| 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(±%) |
±1.5% |
| Control mode |
COT+Ripple |
| Duty cycle (max)(%) |
|
| Operation mode |
PFM |
| Iq (typ) (uA) |
200 |
| Features |
PFM mode，Auto recovery Protection, Stable with 10μF COUT |
| Package |
SOT23-6 |
| Operating temperature range(°C) |
-40°C to 125°C |
| 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 SY81057 and SY81057C
- Forced Continuous Conduction Mode (FCCM) Operation for SY81057E and SY81057B
- Internal Soft-Start Limits the Inrush Current
- Support Smooth Startup with Pre-Biased Output
- 500kHz Switching Frequency Minimizes the External Components for SY81057 and SY81057E
- 1200kHz Switching Frequency Minimizes the External Components for SY81057C
- 1400kHz Switching Frequency Minimizes the External Components for SY81057B
- 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
- MSL Rating: MSL1
The SY81057C 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.
