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SC250EVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC250EVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 18 page  1 www.semtech.com SC250 Step-Down DC-DC Converter with Bias LDO for RF Power Amplifiers POWER MANAGEMENT August 28, 2006 Typical Application Circuit Applications The SC250 is a synchronous step-down converter designed specifically for use as an adaptive voltage supply for CDMA and WCDMA RF Power Amplifiers (PAs). The output voltage can be adjusted dynamically between 0.3V and (Vin - 0.4)V through a linear analog control input. For high power operation, a maximum control input signal level forces the device into bypass mode where the input is connected directly to the output via an internal P- Channel pass transistor. Bypass mode also occurs when the output load demands duty cycles in excess of the maximum rated duty cycle. The SC250 also provides an LDO regulator which can be used to supply a 2.85V bias to the PA. The internal clock runs at 1MHz to maximize efficiency while still allowing the use of small surface mount inductors and capacitors can be used. The peak current rating of the internal PMOS switch allows a DC output current of 600mA. The bypass PMOS current rating allows a minimum of 1A DC output current in the bypass mode. Shutdown turns off all the control circuitry to achieve a typical shutdown current of 0.1μA. CDMA and WCDMA Phones Handheld Radios RF PC Cards Battery Powered RF Devices Adjustable output voltage range — 0.3 to 3.6V Linearly proportional V DAC to VOUT relationship for increased PA efficiency Pass-through mode automatic and on demand Input voltage range — 2.7V to 5V Typical settling time — 40μs Output current capability — 600mA Maximum output current in bypass mode — 1A Up to 96% efficiency Constant frequency operation — 1MHz Less than 1μA shutdown current Internal 75mΩ PMOS bypass transistor PA bias voltage supply — 2.85V, 20mA, 1.5% MLPD-W8, 2.3 x 2.3mm package L1 4.7μH CIN 10μF VIN VOUT VREF GND LX VDAC PGND CREF 1μF EN COUT 4.7μF VIN 3 6 1 4 2 7 5 8 PA RF Output RF Input Vcc GND BIAS ENABLE VDAC SC250 Description Features |
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