High Efficiency, 500kHz, 3A, 18V Input Synchronous Buck Converter
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- Parameters
- Features
- Description
| Part number | SY81153UED |
|---|
| Channel(#) | 1 |
|---|
| Vin (min) (V) | 4.5 |
|---|
| Vin (max) (V) | 18 |
|---|
| Switching frequency (min)(kHz) | |
|---|
| Switching frequency (max)(kHz) | 500 |
|---|
| Vout (min) (V) | 0.6 |
|---|
| Vout (max) (V) | 9.2 |
|---|
| Iout (max) (A) | 3 |
|---|
| Vout2 (min)(V) | |
|---|
| Vout2 (max )(V) | |
|---|
| Iout2 (max)(A) | |
|---|
| Vref accuracy (±%) | ±1.5% |
|---|
| Vout accuracy(±%) | |
|---|
| Control mode | COT+Ripple |
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| Duty cycle (max)(%) | |
|---|
| Operation mode | PFM |
|---|
| Iq (typ) (uA) | 200 |
|---|
| Features | Hic-Cup UVP; Auto-Recovery OTP; UVLO |
|---|
| Package | DFN1.6×1.6-6 |
|---|
| Operating temperature range(°C) | -40°C to 125°C |
|---|
| Functional safety category | |
|---|
- Low RDS(ON) for Internal MOSFETs: 86mΩ Top, 42mΩ Bottom
- Wide Input Voltage Range: 4.5V ~ 18V
- Up to 3A Output Current
- ±1.5% 0.6V Reference
- Precise EN Threshold
- Pulse-Frequency Modulation (PFM) Mode Operation
- 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
- 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: DFN1.6×1.6-6
The SY81153 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 3A. It integrates a top MOSFET and a bottom MOSFET with very low RDS(ON) to minimize conduction loss. The 500kHz high pseudo-constant switching frequency enables using small external inductor and capacitor values.
