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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5065 Datasheet

(MAX5065 / MAX5067) Average-Current-Mode Controllers

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MAX5065 pdf
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19-3035; Rev 1; 11/03
Dual-Phase, +0.6V to +3.3V Output Parallelable,
Average-Current-Mode Controllers
General Description
The MAX5065/MAX5067 dual-phase, PWM controllers
provide high-output-current capability in a compact
package with a minimum number of external compo-
nents. The MAX5065/MAX5067 utilize a dual-phase,
average-current-mode control that enables optimal use
of low RDS(ON) MOSFETs, eliminating the need for exter-
nal heatsinks even when delivering high output currents.
Differential sensing enables accurate control of the out-
put voltage, while adaptive voltage positioning provides
optimum transient response. An internal regulator
enables operation with input voltage ranges of +4.75V to
+5.5V or +8V to +28V. The high switching frequency, up
to 500kHz per phase, and dual-phase operation allow
the use of low-output inductor values and input capacitor
values. This accommodates the use of PC board-
embedded planar magnetics achieving superior reliabili-
ty, current sharing, thermal management, compact size,
and low system cost.
The MAX5065/MAX5067 also feature a clock input
(CLKIN) for synchronization to an external clock, and a
clock output (CLKOUT) with programmable phase delay
(relative to CLKIN) for paralleling multiple phases. The
MAX5065/MAX5067 also limit the reverse current if the
bus voltage becomes higher than the regulated output
voltage. These devices are specifically designed to limit
current sinking when multiple power-supply modules are
paralleled. The MAX5065 offers an adjustable +0.6V to
+3.3V output voltage. The MAX5067 output voltage is
adjustable from +0.8V to +3.3V and features an overvolt-
age protection and a power-good output signal.
The MAX5065/MAX5067 operate over the extended
temperature range (-40°C to +85°C). The MAX5065 is
available in a 28-pin SSOP package. The MAX5067 is
available in a 44-pin thin QFN package. Refer to the
MAX5037A data sheet for a VRM 9.0/VRM 9.1-compati-
ble, VID-controlled output voltage controller in a 44-pin
QFN package.
Applications
Servers and Workstations
Point-of-Load High-Current/High-Density
Telecom DC-DC Regulators
Networking Systems
Large-Memory Arrays
RAID Systems
High-End Desktop Computers
Features
o +4.75V to +5.5V or +8V to +28V Input Voltage
Range
o Adjustable VOUT
+0.6V to +3.3V (MAX5065)
+0.8V to +3.3V (MAX5067)
o Up to 60A Output Current
o Internal Voltage Regulator for a +12V or +24V
Power Bus
o Programmable Adaptive Output Voltage
Positioning
o True Differential Remote Output Sensing
o Out-of-Phase Controllers Reduce Input
Capacitance Requirement and Distribute Power
Dissipation
o Average-Current-Mode Control
Superior Current Sharing Between Individual
Phases and Paralleled Modules
Accurate Current Limit Eliminates MOSFET and
Inductor Derating
o Limits Reverse-Current Sinking in Paralleled
Modules
o Integrated 4A Gate Drivers
o Selectable Fixed Frequency 250kHz or 500kHz Per
Phase (Up to 1MHz for Two Phases)
o External Frequency Synchronization from 125kHz
to 600kHz
o Internal PLL with Clock Output for Paralleling
Multiple DC-DC Converters
o Thermal Protection
o 28-Pin SSOP Package (MAX5065)
o 44-Pin Thin QFN Package (MAX5067)
PART
MAX5065EAI
MAX5067ETH
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
44 Thin QFN
Selector Guide and Pin Configurations appear at end of
data sheet.
________________________________________________________________Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5065 Datasheet

(MAX5065 / MAX5067) Average-Current-Mode Controllers

No Preview Available !

MAX5065 pdf
Dual-Phase, +0.6V to +3.3V Output Parallelable,
Average-Current-Mode Controllers
ABSOLUTE MAXIMUM RATINGS
IN to SGND.............................................................-0.3V to +30V
BST_ to SGND ........................................................-0.3V to +35V
DH_ to LX_ .................................-0.3V to [(VBST_ - VLX_) + 0.3V]
DL_ to PGND ..............................................-0.3V to (VCC + 0.3V)
BST_ to LX_ ..............................................................-0.3V to +6V
VCC to SGND............................................................-0.3V to +6V
VCC, VDD to PGND ...................................................-0.3V to +6V
SGND to PGND .....................................................-0.3V to +0.3V
All Other Pins to SGND...............................-0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
28-Pin SSOP (derate 9.5mW/°C above +70°C) ............762mW
44-Pin Thin QFN (derate 27.0mW/°C above+70°C) ...2162mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
(VCC = +5V, circuit of Figure 1, TA = -40°C to +85°C, unless otherwise noted. Typical specifications are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SYSTEM SPECIFICATIONS
8 28
Input Voltage Range
VIN Short IN and VCC together for +5V input
operation
4.75
V
5.50
Quiescent Supply Current
Efficiency
OUTPUT VOLTAGE
IQ EN = VCC or SGND
η ILOAD = 52A (26A per phase)
4 10
90
mA
%
No load
0.5952 0.6 0.6048
SENSE+ to SENSE- Accuracy
(Note 4)
MAX5065 No load, VCC = +4.75V to +5.5V
or VIN = +8V to +28V
0.594
0.6
0.6064
No load
0.7936 0.8 0.8064
V
MAX5067 No load, VCC = +4.75V to +5.5V 0.792 0.8 0.808
or VIN = +8V to +28V
STARTUP/INTERNAL REGULATOR
VCC Undervoltage Lockout
UVLO VCC rising
4.0 4.15 4.5
V
VCC Undervoltage Lockout
Hysteresis
200 mV
VCC Output Accuracy
MOSFET DRIVERS
Output Driver Impedance
VIN = +8V to +28V, ISOURCE = 0 to 80mA
RON Low or high output
4.85 5.1 5.30
13
V
Output Driver Source/Sink
Current
IDH_, IDL_
4A
Nonoverlap Time
OSCILLATOR AND PLL
tNO CDH_/DL_ = 5nF
60 ns
Switching Frequency
PLL Lock Range
PLL Locking Time
CLKIN = SGND
fSW CLKIN = VCC
fPLL
tPLL
238 250 262
kHz
475 500 525
125 600 kHz
200 µs
2 _______________________________________________________________________________________


Part Number MAX5065
Description (MAX5065 / MAX5067) Average-Current-Mode Controllers
Maker Maxim Integrated Products
Total Page 30 Pages
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