19-2286; Rev 1; 9/03
Low-Cost Voltage-Mode PWM
The MAX1966/MAX1967 are voltage-mode pulse-width-
modulated (PWM), step-down DC-DC controllers that
are ideal for a variety of cost-sensitive applications.
They drive low-cost N-MOSFETs for both the high-side
switch and synchronous rectifier and require no external
Schottky power diode or current-sense resistor. Short-
circuit and current-limit protection is provided by sens-
ing the drain-to-source voltage on the low-side FET.
Both devices can supply outputs as low as 0.8V and are
well suited for DSP cores and other low-voltage logic.
The MAX1966 has an input range of 2.7V to 5.5V while
the MAX1967 has an input range of 2.7V to 28V. In
ultra-low-cost designs, the MAX1966/MAX1967 can
provide efficiency exceeding 90% and can achieve
95% efficiency with optimized component selection.
The MAX1966/MAX1967 operate at 100kHz and ac-
commodate aluminum electrolytic capacitors and pow-
dered-iron core magnetics in minimum-cost designs.
They also provide excellent performance with high-per-
formance surface-mount components. The MAX1966 is
available in a low-cost 8-pin SO package. The MAX1967
is available in a 10-pin µMAX package.
No Schottky Diode or Current-Sense Resistor
Low-Cost External Components
All N-Channel FET Design
2.7V to 5.5V Input Range (MAX1966)
2.7V to 28V Input Range (MAX1967)
0.8V Feedback for Low-Voltage Outputs
100kHz Switching Frequency Accommodates
Output Current-Limit and Short-Circuit Protection
-40°C to +85°C
-40°C to +85°C
Graphic Card Supplies
xDSL Modems and
Cable Modems and
Telecom Power Supplies
Typical Operating Circuit
Pin Configurations continued at end of data sheet.
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.