Datasheet

System Diagram
Figure 1. Typical industrial control power system diagram.
Features Applications
Minimal external components and low system cost
Versatile functionality allows stocking of fewer DC-DC regulators
Low power dissipation
Reliable operation in adverse industrial environments
Pmod
™
-compatible form factor
Industrial sensors
Process control
4–20mA current loops
General-purpose point-of-load
High-voltage LDO replacement
HVAC and building control
PLCs
Detailed Description of Hardware
The Palo Verde subsystem reference design is a high-efficiency, high-voltage, synchronous step-down DC-DC converter
solution with integrated MOSFETs. Palo Verde operates over a wide 4.5V to 60V input voltage range. The converter delivers
output current up to 300mA at 3.3V. When EN/UVLO and VCC UVLO are satisfied, an internal power-up sequence soft-starts
the error-amplifier reference, resulting in a clean monotonic output-voltage soft-start independent of the load current. The
VOUT pin monitors the output voltage through an internal resistor-divider. RESET transitions to a high-impedance state 2ms
after the output voltage reaches 95% of regulation. The device selects either PFM or forced-PWM mode depending on the
state of the MODE pin at power-up (this reference design sets the device in PWM mode). By pulling the EN/UVLO pin to low,
the device enters the shutdown mode and consumes only 2.2µA (typical) of standby current.
The reference design switches at a fixed frequency of 500kHz, and delivers a peak efficiency of 86.77% with the supplied
components when the input is 24V.
This reference board is designed in a Pmod-compatible form factor with IO pass-through, but can be used in any 4.5V–60V to
3.3V power application up to 300mA.
Page 2 of 6