Step-Down Controller. MAX8664 Datasheet

MAX8664 Controller. Datasheet pdf. Equivalent

Part MAX8664
Description Step-Down Controller
Feature www.DataSheet4U.com 19-0796; Rev 0; 4/07 Low-Cost, Dual-Output, Step-Down Controller with Fast Tran.
Manufacture Maxim Integrated Products
Datasheet
Download MAX8664 Datasheet




MAX8664
www.DataSheet4U.com
19-0796; Rev 0; 4/07
Low-Cost, Dual-Output, Step-Down
Controller with Fast Transient Response
General Description
The MAX8664 dual-output PWM controller is a low-cost,
high-performance solution for systems requiring dual
power supplies. It provides two individual outputs that
operate 180° out-of-phase to minimize input current
ripple, and therefore, capacitance requirements. Built-in
drivers are capable of driving external MOSFETs to
deliver up to 25A output current from each channel.
The MAX8664 operates from a 4.5V to 28V input volt-
age source and generates output voltages from 0.6V
up to 90% of the input voltage on each channel. Total
output regulation error is less than ±0.8% over load,
line, and temperature.
The MAX8664 operates with a constant switching fre-
quency adjustable from 100kHz to 1MHz. Built-in boost
diodes reduce external component count. Digital soft-
start eliminates input inrush current during startup. The
second output has an optional external REFIN2, facili-
tating tracking supply applications. Each output is
capable of sourcing and sinking current, making the
device a great solution for DDR applications.
The MAX8664 employs Maxim’s proprietary peak volt-
age-mode control architecture that provides superior
transient response during either load or line transients.
This architecture is easily stabilized using two resistors
and one capacitor for any type of output capacitors. Fast
transient response requires less output capacitance,
consequently reducing total system cost. The MAX8664B
latches off both controllers during a fault condition, while
the MAX8664A allows one controller to continue to func-
tion when there is a fault in the other controller.
Applications
Desktop and Notebook PCs
Graphic Cards
ASIC/CPU/DSP Power Supplies
Set-Top Box Power Supply
Printer Power Supply
Network Power Supply
POL Power Supply
Pin Configuration appears at end of data sheet.
Features
o ±0.8% Output Accuracy Over Load and Line
o Operates from a Single 4.5V to 28V Supply
o Simple Compensation for Any Type of Output
Capacitor
o Internal 6.5V Regulator for Gate Drive
o Integrated Boost Diodes
o Adjustable Output from 0.6V to 0.9 x VIN
o Digital Soft-Start Reduces Inrush Current
o 100kHz to 1MHz Adjustable Switching
o 180° Out-of-Phase Operation Reduces Input
Ripple Current
o Overcurrent and Overvoltage Protection
o External Reference Input for Second Controller
o Prebiased Startup Operation
Ordering Information
PART
PIN-
PACKAGE
PKG
CODE
FAULT
ACTION
MAX8664AEEP+ 20 QSOP
E20-1 Independent
MAX8664BEEP+ 20 QSOP
E20-1
Joint
Note: This device operates over the -40°C to +85°C operating
temperature range.
+Denotes lead-free package.
Typical Operating Circuit
IN2
OUT2
IN
ILIM2
DH2
BST2
LX2
VL
ILIM1
DH1
BST1
LX1
DL2 DL1
MAX8664
GND PGND
FB2
REFIN2
VCC
FB1
PWRGD
OSC/EN12
IN1
OUT1
________________________________________________________________ Maxim Integrated Products 1
For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.



MAX8664
www.DataSheet4U.com
Low-Cost, Dual-Output, Step-Down
Controller with Fast Transient Response
ABSOLUTE MAXIMUM RATINGS
IN to GND ...........................................................…-0.3V to +30V
VL to GND...................................................................-0.3 to +8V
IN, BST_ to VL ........................................................-0.3V to +30V
VCC, FB_, PWRGD to GND.......................................-0.3V to +6V
VL to VCC ....................................................................-2V to +8V
PGND to GND .......................................................-0.3V to +0.6V
DL_ to PGND...............................................-0.3V to (VVL + 0.3V)
DH_ to PGND............................................-0.3V to (VBST_+ 0.3V)
BST_ to GND.............................................................-0.3V to 38V
BST_ to LX ................................................................-0.3V to +8V
LX_ to PGND .................-1V (-2.5V for < 50ns transient) to +30V
DH_ to LX_................................................-0.3V to (VBST_+ 0.3V)
ILIM_ to GND ...............................................-0.3V to (VIN + 0.3V)
ILIM_ to LX_............................................................-0.6V to +30V
OSC/EN12, REFIN2 to GND .....................-0.3V to (VVCC + 0.3V)
VL Continuous Current ..............................................125mARMS
VCC Continuous Current..............................................10mARMS
Continuous Power Dissipation (TA = +70°C) (Note 1)
20-Pin QSOP (derate 11.0mW/°C above +70°C).........884mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Package mounted on a multilayer PCB.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = 12V, ROSC/EN12 to GND = 56.1kΩ, REFIN2 = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER
SUPPLY VOLTAGES
CONDITIONS
MIN TYP MAX UNITS
IN Supply Voltage
VL Output Voltage
VCC Output Voltage
VCC Undervoltage Lockout
(UVLO)
Standby Supply Current
Operating Supply Current
REGULATOR SPECIFICATIONS
IN = VL = VCC
7.2V < VIN < 28V, 0 < IVL < 60mA
7.2V < VIN < 28V, 0 < ICC < 5mA
Rising
Hysteresis
OSC/EN12 not
connected
VIN = 12V, IIN
VCC = VIN = VVL = 5V, IIN + IVL + IVCC
No switching,
VFB_ = 0.65V
VIN = 12V, IIN
VCC = VIN = VVL = 5V, IIN + IVL+ IVCC
7.2
4.5
6.10
4.5
3.4
6.6
5.0
3.5
350
0.095
0.08
1.4
1.1
28.0
5.5
6.75
5.5
3.6
0.2
0.2
2.5
1.8
V
V
V
V
mV
mA
mA
Reference Accuracy
FB_ Regulation Accuracy
TA = 0°C to +85°C
TA = -40°C to +85°C
VREFIN2 = VVCC
VREFIN2 = 1.000V
TA = 0°C to +85°C
TA = -40°C to +85°C
0.5955
0.5930
0.5952
0.5925
0.995
0.600
0.600
0.600
0.600
1.000
0.6045
0.6070
0.6048
0.6075
1.005
V
V
REFIN2 to Internal Reference
Switchover Threshold
Not to be switched during operation
2 VVCC - VVCC - V
0.7 0.3
REFIN2 Maximum Program Voltage
REFIN2 Disable Threshold
1.3 V
50 mV
FB Input Bias Current
REFIN2 Bias Current
FB Propagation Delay
VFB = 0.5V
VREFIN2 = 0.65V
FB rising to DH falling
3 nA
3 nA
90 ns
2 _______________________________________________________________________________________







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