Regulated Step-Down Charge Pump DC-DC Converter
The FAN5631 FAN5632 is an advanced, third-generation switched capacitor Step-down DC/DC converter utilizing Fairchild's proprietary ScalarPump technology. This innovative architecture utilizes scalar Switch re-configuration and fractional switching techniques to produce low output ripple, lower ESR spikes, and improve efficiency over a wide load range.
The FAN5631 FAN5632 produces a fixed, regulated output voltage from an input voltage of 2.2V to 5V.
To maximize efficiency, the FAN5631 5632 achieves regulation by skipping pulses. Depending on load current, the size of the switches are scaled dynamically; consequently, current spikes and EMI are minimized. An internal soft-start circuitry prevents excessive current from the supply. The device is internally protected against short-circuit and over-temperature conditions.
The FAN5631 has a dual-output voltage feature. When VSEL is high, VOUT is 1.5V; and when VSEL is low, VOUT is 1.2V.
The FAN5632 has an efficiency optimizer feature that, when enabled, changes the Switch mode configuration from 2:1 to 1:1 at the lower threshold of VIN. The efficiency is maintained at its peak level over a wider range of input voltages. In addition, VOUT varies from 1.2V to 1.5V as a result of this efficiency optimization. If the efficiency optimizer is not enabled, VOUT is regulated to 1.5V.
Both the FAN5631 and FAN5632 are available in a 10-lead 3x3mm MLP package.
By Fairchild Semiconductor
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