|
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.
|
