SC194BMLTRT

The SC194B is a synchronous step-down converter with integrated power devices. Four selectable output voltages suitable for portable device interface, memory function blocks, and 5V to 3.3V voltage conversion are available. Automatic selection of Power Save Mode (PSAVE) is supported which enhances efficiency. A 100% duty cycle mode allows operation for input voltages close to the required output voltage.The need for external components is minimized by providing internal feedback compensation, and allowing selection of the required output voltage by hard wiring VID code inputs. The maximum current rating of the internal MOSFET switches allows a DC output current of 1A. The switching frequency is nominally set to 1MHz, allowing the use of small inductors and capacitors. A flexible clocking scheme is used that allows synchronization to an external oscillator or control by the internal oscillator.The device can operate in either forced PWM mode or in PSAVE mode. If PSAVE mode is enabled the part will automatically enter PSAVE at light loads to maintain maximum efficiency across the full load range. For noise sensitive applications, PSAVE mode can be disabled by synchronizing to an external oscillator, or pulling the SYNC/ PWM pin high. Shutdown turns off all the control circuitry to achieve a typical shutdown current of 0.1µA.

• 95% efficiency
• PSAVE operation to maximize efficiency
• Output current - 1A
• Input range - 2.7V to 5.5V
• Four selectable output voltages
• Quiescent current - 17µA in PSAVE
• Dynamic voltage positioning capability
• Fixed 1MHz frequency or 750kHz to 1.25MHz synchronized operation
• Current mode operation for excellent line and load transient response
• 100% duty cycle in dropout
• Soft-start
• Over-temperature and short-circuit protection
• Lead-free package - 3mm x 3mm MLPD