The MAX17024 pulse-width modulation (PWM) controller
provides high efficiency, excellent transient
response, and high DC-output accuracy needed for
stepping down high-voltage batteries to generate low-voltage
core or chipset/RAM bias supplies in notebook
computers. The output voltage can be controlled using
the dynamic REFIN, which supports input voltages
between 0 to 2V. The REFIN adjustability combined
with a resistive voltage-divider on the feedback input
allows the MAX17024 to be configured for any output
voltage between 0 to 0.9 x VIN.
Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios (low-duty-cycle applications) with ease and provides 100ns "instant-on" response to
load transients while maintaining a relatively constant
switching frequency. Strong drivers allow the MAX17024
to efficiently drive large synchronous-rectifier MOSFETs.
The controller senses the current across the sense
resistor series with the synchronous rectifier to achieve
highly accurate valley current-limit protection.
The MAX17024 includes a voltage-controlled soft-start
and soft-shutdown to limit the input surge current, provide
a monotonic power-up (even into a precharged
output), and provide a predictable power-up time. The
controller also includes output undervoltage and thermal-fault protection.
The MAX17024 is available in a tiny 14-pin, 3mm x
3mm TDFN package. For space-constrained applications,
refer to the MAX17016 single step-down with 26V
internal MOSFETs capable of supporting 10A continuous
load. The MAX17016 is available in a small 40-pin,
6mm x 6mm TQFN package.
Applications
- DDR Memory-VDDQ or VTT
- GPU Core Supply
- I/O and Chipset Supplies
- Notebook Computers
- Point-of-Load Applications
- Step-Down Power Supply
