The FAN2011/FAN2012 is a high-efficiency, low-noise synchronous
Pulse Width Modulated (PWM) current mode DC-DC converter, designed
for low voltage applications. It provides up to 1.5A continuous
load current from the 4.5V to 5.5V input. The output
voltage is adjustable over a wide range of 0.8V to VIN by
means of an external voltage divider.
The FAN2011 is always on, while the FAN2012 has an
"Enable Input," and the device can be put in the shutdown
mode, in which the ground current falls below 1µA.
A current mode control loop with a fast transient response
ensures excellent line and load regulation. The fixed 1.3MHz
switching frequency enables the user to choose a small,
inexpensive external inductor and capacitor. Filtering is also
easily accomplished with very small components.
Protection features include input under-voltage lockout,
short circuit protection and thermal shutdown. Soft-start
limits in-rush current during start-up conditions.
The device is available in a 3x3mm 6-lead MLP package,
making it possible to build a 1.5A complete DC/DC
converter in a tiny space on the PCB.
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