Silergy SY21034
The SY21034 high-efficiency asynchronous stepdown DC/DC regulator can deliver 0.6A current over a wide input voltage range from 4.5V to 100V. It uses constant-off-time and peak-current-mode control to achieve fast transient response, and integrates a main switch with low RDS(ON) to minimize conduction loss. The 200kHz switching frequency permits low output-voltage ripple and reduces external inductor and capacitor sizes.| Part No. | SY21034 |
|---|---|
| Datasheet | SY21034 Download |
| Manufacturer |  Silergy |
| Description | 0.6A Asynchronous Step-Down Regulator |
| Buy | Stock & Price |
GENERAL DESCRIPTION
The SY21034 also provides cycle-by-cycle current limiting and hiccup shortcircuit protection. The SY21034 is available in a compact TSOT23-6 package.FEATURES
● 4.5V to 100V Input Voltage Range● Up to 0.6A Output Current
● Low RDS(ON) for Internal N-Channel power FET: 1Ω
● 200kHz Pseudo-constant Switching Frequency
● Constant Off-Time and Peak-Current-Mode control
● Internal Soft-Start
● 0.6V ±1% Reference
● Hiccup Mode Short-Circuit Protection
● EN On/Off Control with Accurate Threshold
● Cycle-by-Cycle Peak Current limit
● Compact TSOT23-6 Package
APPLICATIONS
● Non-Isolated Telecommunication Buck Regulator● Secondary High-Voltage Post Regulator
● Automotive Systems
● Electric Bicycles Typical Application CBS RBS VIN: 4.5~100V CIN ON/ OFF BS IN LX EN FB GND L D VOU T RH CFF COU T RL Figure 1. Typical Application Circuit Efficiency (%) Efficiency vs. Output Current (VOUT=12V, IOUT=0A~0.6A, L=68µH/CDRH8D43-680NC) 100 90 80 70 60 50 40 VI N=24 V,V O U T=12 V 30 VI N=48 V ,V OU T=12 V 20 VIN=85 V,V OU T=12 V 10 0.001 0.01 0.1 Output Current (A) Figure 2.
