Silergy SY21252
The SY21252 develops a high efficiency, current mode adaptive constant off time controlled, asynchronous step-down DC/DC converter capable of delivering 2A output current. The SY21252 operates over a wide input voltage range from 4.5V to 100V and integrates main switch with very low RDS(ON) to minimize the conduction loss. The switching frequency is adjustable from 100kHz to 1MHz using an external resistor.| Part No. | SY21252 |
|---|---|
| Datasheet | SY21252 Download |
| Manufacturer |  Silergy |
| Description | 2A Asynchronous Step Down Regulator |
| Buy | Stock & Price |
GENERAL DESCRIPTION
And the device features cycle-by-cycle peak current limitation. Ordering Information SY21252 □(□□)□ Tempera ture Code Pa cka ge Code Optional Spec Code Ordering Number Package type Note SY21252FCC SO8E --FEATURES
● Low RDS(ON) for Internal N-channel Power FET(TOP):175mΩ● 4.5-100V Input Voltage Range
● 2A Output Current Capability
● Adjustable Switching Frequency Range: 100kHz to1MHz
● Internal Soft-start Limits the Inrush Current
● Hic-cup Mode Output Short Circuit Protection
● EN ON/OFF Control with Accurate Threshold
● Cycle-by-cycle Peak Current Limit
● 0.8V±1% Reference Voltage Accuracy
● Compact Package: SO8E
APPLICATIONS
● Non-isolated Telecommunication Buck Regulator● Secondary High Voltage Post Regulator
● Automotive Systems
● Electric Bicycle Typical
APPLICATIONS
CBS VIN CIN RPG BS IN LX ON/ OFF EN PG FB FS GND RFS Efficiency vs. Output Current (fSW=200kHz, L=22μH/PCMB104T-220MS) 10 0 90 80 Efficiency (%) 70 L1 VOUT 60 50 CFF R1 COUT 40 30 20 R2 10 0 0.00 1 0.01 VIN=12V, VOUT=5V VIN=24V, VOUT=5V VIN=48V, VOUT=5V VIN=72V, VOUT=5V 0.1 12 Output Current (A) Figure1.
