SC251: Step-down DC-DC Converter with Bias LDO for WCDMA Amplifiers
The SC251 is a synchronous step-down converter designed for use as an adaptive voltage supply for WCDMA RF power amplifiers (PAs).
Collapse All
- VOUT exponentially proportional to VDAC for maximum efficiency (patent pending)
- Output range and pass-through mode - 0.5V to 3.4V
- Output current - 800mA
- Shutdown current - < 1μA
- LDO PA bias supply - 2.85V, 10mA
- Internal clock - 1MHz
- Continuous short circuit protection on VOUT
- Duty cycle mode - 100%
- Internal PMOS bypass transistor
- Gate drive available for external bypass transistor
- Over 90% efficiency
- Low and high power modes for optimum dual-mode PA efficiency
- Switching time (lowest to highest output) < 40μs
- Micro-lead frame package MLPD-10, 3mm x 3mm
- 3G mobile phones - RF PA power supply
- WCDMA power amplifier modules
- Wireless modems
- SC251MLTRT: Lead-free, RoHS and WEEE compliant, 3000 pcs. Tape & Reel
