The MAX8529 dual, synchronized, step-down controller
generates two outputs from input supplies ranging from
4.75V to 23V. Each output is adjustable from sub-1V
to 18V. Input voltage ripple and total RMS input ripple
current are reduced by synchronized 180-degree out-of-phase
operation.
The switching frequency is adjustable from 600kHz to
1.5MHz with an external resistor. Alternatively, the controller
can be synchronized to an external clock generated
to another MAX8529 or a system clock. One
MAX8529 can be set to generate an in-phase, or 90-degree out-of-phase, clock signal for synchronization with additional controllers. This allows two controllers to operate either as an interleaved two- or four-phase system
with each output shifted by 90 degrees. These
devices also feature soft-start and soft-stop.
The MAX8529 eliminates the need for current-sense
resistors by utilizing the low-side MOSFET's on-resistance
as a current-sense element. This protects the
DC-to-DC components from damage during output
overload conditions or when output short circuit faults
without requiring a current-sense resistor. Adjustable
foldback current limit reduces power dissipation during
short-circuit conditions. The MAX8529 includes a
power-on reset output to signal the system when both
outputs reach regulation.
The MAX8529 is available in a 24-pin QSOP package. An
evaluation kit is available to speed designs.
Key Features
Applications/Uses
Low Output Noise in DSL Band
Ceramic Input/Output Capacitors
Step-Down or Step-Up/Step-Down Operation
Four Output, 90-Degree Out-of-Phase Operation (Using Two MAX8529s)
Foldback Current Limit
4.75V to 23V Input Supply Range
0 to 18V Output Voltage Range (Up to 6A)
> 90% Efficiency
Fixed-Frequency PWM Operation
Adjustable 600kHz to 1.5MHz Switching Frequency
External SYNC Input
Clock Output for Master/Slave Synchronization
Soft-Start and Soft-Stop
Active-Low RST Output with 140ms Minimum Delay
Lossless Current Limit (No Sense Resistor)
Broadband Routers
DSP, ASIC, and FPGA Power Supplies
Set-Top Boxes
xDSL Modems and Routers
Key Specifications:
Switch-Mode DC-DC Power Supplies
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
Download
E-Mail