The ADP2441 / ADP2442 is a constant frequency, current mode control,
synchronous, step-down, dc-to-dc regulator that is capable of
driving loads of up to 1 A with excellent line and load regulation
characteristics. The ADP2442 operates with a wide input voltage
range from 4.5 V to 36 V, which makes it ideal for regulating power
from a wide variety of sources. In addition, the ADP2442 has
very low minimum on time (50 ns) and is, therefore, suitable for
applications requiring a very high step-down ratio.
The output voltage can be adjusted from 0.6 V to 0.9 × VIN.
High efficiency is obtained with integrated low resistance
N-channel MOSFETs for both high-side and low-side devices.
The switching frequency is adjustable from 300 kHz to 1 MHz with
an external resistor. The ADP2442 also has an accurate power-good
(PGOOD) open-drain output signal.
The ADP2442 offers the flexibility of external clock synchronization.
The switching frequency can be synchronized to an external
clock, applied to the SYNC/MODE pin. The ADP2442 can also
be configured to operate in the forced fixed frequency mode for
low EMI or power saving mode to reduce the switching losses at
light load.
The ADP2442 uses hiccup mode to protect the IC from short
circuits or from overcurrent conditions on the output. The internal
soft start limits inrush current during startup for a wide variety of
load capacitances. Other key features include input undervoltage
lockout (UVLO), thermal shutdown (TSD), and precision enable
(EN), which can also be used as a logic level shutdown input.
The ADP2442 is available in a 3 mm × 3 mm, 12-lead LFCSP
package and is rated for a junction temperature range from
−40°C to +125°C.
APPLICATIONS
- Point of load applications
- Distributed power systems
- Industrial control supplies
- Standard rail conversion to 24 V/12 V/5 V/3.3 V
