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MAX8529 Datasheet

  • MAX8529

  • 1.5MHz Dual 180?? Out-of-Phase PWM Step-Down Controller with...

  • Maxim   Maxim

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19-2696; Rev 0; 1/03
KIT
ATION
EVALU
E
BL
AVAILA
1.5MHz Dual 180擄 Out-of-Phase
PWM Step-Down Controller with POR
General Description
Features
o
Low Output Noise in DSL Band
o
Ceramic Input/Output Capacitors
o
Step-Down or Step-Up/Step-Down Operation
o
Four Output, 90-Degree Out-of-Phase Operation
(Using Two MAX8529s)
o
Foldback Current Limit
o
4.75V to 23V Input Supply Range
o
0 to 18V Output Voltage Range (Up to 6A)
o
>90% Efficiency
o
Fixed-Frequency PWM Operation
o
Adjustable 600kHz to 1.5MHz Switching
Frequency
o
External SYNC Input
o
Clock Output for Master/Slave Synchronization
o
Soft-Start and Soft-Stop
o
RST
Output with 140ms Minimum Delay
o
Lossless Current Limit (No Sense Resistor)
MAX8529
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 con-
troller can be synchronized to an external clock gener-
ated 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 sys-
tem 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鈥檚 on-resis-
tance 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.
Ordering Information
PART
MAX8529EEG
TEMP RANGE
-40擄C to +85擄C
PIN-PACKAGE
24 QSOP
Applications
xDSL Modems and Routers
DSP, ASIC, and FPGA Power Supplies
Set-Top Boxes
Broadband Routers
TOP VIEW
COMP2 1
FB2 2
ILIM2 3
OSC 4
V+ 5
REF 6
GND 7
CKO 8
SYNC 9
ILIM1 10
FB1 11
COMP1 12
Pin Configuration
24 EN
23 DH2
22 LX2
21 BST2
20 DL2
MAX8529
19 V
L
18 PGND
17 DL1
16 BST1
15 LX1
14 DH1
13 RST
QSOP
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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