| Part Number | CS51221EDR16G | CS51221ED16G | 
|---|---|---|
| Manufacturer | onsemi | onsemi | 
| Category | PMIC - Voltage Regulators - DC DC Switching Controllers | PMIC - Voltage Regulators - DC DC Switching Controllers | 
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| Product Status | Active | Obsolete | 
| Output Type | Transistor Driver | Transistor Driver | 
| Function | Step-Up/Step-Down | Step-Up/Step-Down | 
| Output Configuration | Positive, Isolation Capable | Positive, Isolation Capable | 
| Topology | Forward Converter | Forward Converter | 
| Number of Outputs | 1 | 1 | 
| Output Phases | 1 | 1 | 
| Voltage - Supply (Vcc/Vdd) | 3.8V ~ 15V | 3.8V ~ 15V | 
| Frequency - Switching | 1MHz | 1MHz | 
| Duty Cycle (Max) | 85% | 85% | 
| Synchronous Rectifier | No | No | 
| Clock Sync | Yes | Yes | 
| Serial Interfaces | - | - | 
| Control Features | Current Limit, Frequency Control, Ramp, Soft Start | Current Limit, Frequency Control, Ramp, Soft Start | 
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 16-SOIC (0.154", 3.90mm Width) | 16-SOIC (0.154", 3.90mm Width) | 
| Supplier Device Package | 16-SOIC | 16-SOIC |