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MAX1955 Datasheet

  • MAX1955

  • "1.6V to 5.5V Input, 0.5% Accurate, Dual180?? Out-of-Phase S...

  • Maxim   Maxim

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19-2623; Rev 0; 1/03
KIT
ATION
EVALU
E
BL
AVAILA
1.6V to 5.5V Input, 0.5% Accurate, Dual
180擄 Out-of-Phase Step-Down Controllers
General Description
Features
o
Operates from a 1.6V to 5.5V Supply (MAX1956)
o
0.5% Output Accuracy
o
0.8V to 0.9V
IN
Output Range
o
Up to 25A per Phase Output Current
o
On-Chip Boost Regulator Provides 5V Gate Drive
o
Up to 93% Efficiency
o
180擄 Out-of-Phase Operation
o
鹵4% Voltage Margining
o
Lossless, Foldback Current Limit
o
Selectable Voltage Sequencing
o
Synchronizable to External Clock
o
Digital Soft-Start and Soft-Stop
o
Small 28-Pin, 5mm
鉁?/div>
5mm Thin QFN Package
MAX1955/MAX1956
The MAX1955/MAX1956 are dual-output, fixed-frequency,
voltage-mode, pulse-width modulated (PWM) step-down
controllers with 0.5% output accuracy. Each controller
switches at a constant 600kHz and is 180擄 out-of-phase
with the other controller, reducing input ripple current
and the number of input capacitors.
An on-chip bias supply generates a 5V gate drive to
deliver up to 25A output current per phase with low-cost
N-channel MOSFETs at up to 93% efficiency. Lossless
adjustable current limit eliminates expensive current-
sense resistors and improves efficiency. Foldback current
limit reduces power dissipation during short-circuit
conditions and handles transient overloads better than
controllers using hiccup-mode short-circuit protection.
Output voltage margining shifts output voltage by
鹵4% from the nominal value to simplify system test.
Outputs also can be powered up and down in select-
able sequences to meet core and logic supply-rail
requirements.
The MAX1955/MAX1956 are available in a 28-lead thin
QFN package with exposed pad.
Ordering Information
PART
MAX1955ETI
MAX1956ETI
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
28 Thin QFN-EP*
28 Thin QFN-EP*
Applications
Base Stations
Telecom and Network Equipment
Servers
DSP, ASIC, 碌P, and FPGA Supplies
INPUT
1.6V TO 5.5V
*EP
= Exposed pad.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
VDD
IN
LXB
BST1
OUTPUT 1
0.8V TO 0.9V
IN
UP TO 25A
DH1
LX1
V
DD
BST2
DH2
LX2
MAX1956
OUTPUT 2
0.8V TO 0.9V
IN
UP TO 25A
DL2
FB2
DL1
PGND
FB1
COMP1
SEQ
GND
SYNCHRONIZATION
CLOCK
ON/OFF
VOLTAGE
MARGINING
ILIM1
SYNC
EN
ILIM2
AV
DD
VDD
COMP2
REF
________________________________________________________________
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.

MAX1955 PDF文件相關(guān)型號

MAX1955ETI,MAX1956,MAX1956ETI

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