The ADP1853 is a wide range input, dc-to-dc, synchronous
buck controller capable of running from commonly used 3.3 V
to 12 V (up to 20 V) voltage inputs. The device nominally
operates in current mode with valley current sensing providing
the fastest step response for digital loads. It can also be
configured as a voltage mode controller with low noise and
crosstalk for sensitive loads.
The ADP1853 can be used as a master synchronization clock
for the power system and for convenient synchronization
between controllers. The CLKOUT signal can synchronize
other devices in the ADP185x family such that slave devices
are phase-shifted from the master to reduce the input ripple
current, improve EMI, and reduce the size of the input bulk
capacitance. The ADP1853 can also be configured as a slave
device for current sharing. Additionally, the ADP1853 includes
accurate tracking, precision enable, and power good functions
for sequencing. The ADP1853 provides a high speed, high peak
current gate driving capability to enable energy efficient power
conversion. The device can be configured to operate in power
saving mode by skipping pulses, reducing switching losses and
improving efficiency at light load and standby conditions.
The accurate current limit allows design within a narrower
range of tolerances and can reduce overall converter size and
cost. The ADP1853 can regulate down to 0.6 V output using a
high accuracy reference with ±1% tolerance over the
temperature range from −40°C to 125°C.
With a wide range input voltage, the ADP1853 is designed to
provide the designer with maximum flexibility for use in a
variety of system configurations; loop compensation, soft start,
frequency setting, power saving mode, current limit, and
current sense gain can all be programmed using external
components. In addition, the external RAMP resistor allows
choosing optimal slope and VIN feedforward in both current
and voltage mode for excellent line rejection. The linear
regulator and the boot strap diode for the high-side driver are
internal.
Protection features include undervoltage lock out, overvoltage,
overcurrent/short circuit, and overtemperature.
Applications
- Intermediate bus and POL systems requiring sequencing and
tracking, including
- Telecom base station and networking
- Industrial and Instrumentation
- Medical and healthcare
