MAX17024 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Single Quick-PWM Step-Down Controller with Dynamic REFIN

19-1040; Rev 0; 10/07
EVAALVUAAILTAIOBNLEKIT
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
General Description
The MAX17024 pulse-width modulation (PWM) con-
troller 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 V_IN.
Maxim’s proprietary Quick-PWM™ quick-response, con-
stant-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, pro-
vide a monotonic power-up (even into a precharged
output), and provide a predictable power-up time. The
controller also includes output undervoltage and ther-
mal-fault protection.
The MAX17024 is available in a tiny 14-pin, 3mm x
3mm TDFN package. For space-constrained applica-
tions, refer to the MAX17016 single step-down with 26V
internal MOSFETs capable of supporting 10A continu-
ous load. The MAX17016 is available in a small 40-pin,
6mm x 6mm TQFN package.
Applications
Notebook Computers
I/O and Chipset Supplies
GPU Core Supply
DDR Memory—VDDQ or VTT
Point-of-Load Applications
Step-Down Power Supply
Features
o Quick-PWM with Fast Transient Response
o Supports Any Output Capacitor
No Compensation Required with
Polymers/Tantalum
Stable with Ceramic Output Capacitors Using
External Compensation
o Precision 2V ±10mV Reference
o Dynamically Adjustable Output Voltage
(0 to 0.9 x V_IN Range)
Feedback Input Regulates to 0 to 2V REFIN
Voltage
0.5% V_OUT Accuracy Over Line and Load
o 26V Maximum Input Voltage Rating
o Resistively Programmable Switching Frequency
o Undervoltage/Thermal Protection
o Voltage Soft-Start and Soft-Shutdown
o Monotonic Power-Up with Precharged Output
o Power-Good Window Comparator
Ordering Information
PART
PIN-PACKAGE
PKG TOP
CODE MARK
MAX17024ETD 14 TDFN-EP* 3mm x 3mm T1433-1 ADO
Note: This device is specified over the -40°C to +85°C operating
temperature range.
+Denotes a lead-free package.
*EP = Exposed paddle.
Pin Configuration
TOP VIEW
14 13 12 11 10 9 8
MAX17024
GND
1234567
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
TDFN
(3mm x 3mm)
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.