MAX1966 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Low-Cost Voltage-Mode PWM Step-Down Controllers

19-2286; Rev 1; 9/03
Low-Cost Voltage-Mode PWM
Step-Down Controllers
General Description
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.
Applications
Set-Top Boxes
Graphic Card Supplies
xDSL Modems and
Routers
Cable Modems and
Routers
Telecom Power Supplies
Networking Power
Supplies
Termination Supplies
Pin Configurations
Features
o Cost-Optimized Design
o No Schottky Diode or Current-Sense Resistor
Required
o >95% Efficiency
o Low-Cost External Components
o All N-Channel FET Design
o 2.7V to 5.5V Input Range (MAX1966)
o 2.7V to 28V Input Range (MAX1967)
o 0.8V Feedback for Low-Voltage Outputs
o 100kHz Switching Frequency Accommodates
Low-Cost Components
o Thermal Shutdown
o Output Current-Limit and Short-Circuit Protection
PART
MAX1966ESA
MAX1967EUB
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
10 µMAX
2.7V TO
5.5V INPUT
Typical Operating Circuit
VIN
BST
TOP VIEW
BST 1
COMP/EN 2
FB 3
VIN 4
MAX1966
8 DH
7 LX
6 GND
5 DL
SO
Pin Configurations continued at end of data sheet.
DH
MAX1966
V_OUT
LX
COMP/EN DL
GND
FB
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