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 R
DS(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.
Features
o
+4.75V to +5.5V or +8V to +28V Input Voltage
Range
o
Adjustable V
OUT
+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)
MAX5065/MAX5067
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
Ordering Information
PART
MAX5065EAI
MAX5067ETH
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.
Dual-Phase, +0.6V to +3.3V Output Parallelable,
Average-Current-Mode Controllers
MAX5065/MAX5067
ABSOLUTE MAXIMUM RATINGS
IN to SGND.............................................................-0.3V to +30V
BST_ to SGND ........................................................-0.3V to +35V
DH_ to LX_ .................................-0.3V to [(V
BST
_ - V
LX
_) + 0.3V]
DL_ to PGND ..............................................-0.3V to (V
CC
+ 0.3V)
BST_ to LX_ ..............................................................-0.3V to +6V
V
CC
to SGND............................................................-0.3V to +6V
V
CC
, V
DD
to PGND ...................................................-0.3V to +6V
SGND to PGND .....................................................-0.3V to +0.3V
All Other Pins to SGND...............................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +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
(V
CC
= +5V, circuit of Figure 1, T
A
= -40°C to +85°C, unless otherwise noted. Typical specifications are at T
A
= +25°C.) (Note 1)
PARAMETER
SYSTEM SPECIFICATIONS
8
Input Voltage Range
Quiescent Supply Current
Efficiency
OUTPUT VOLTAGE
No load
SENSE+ to SENSE- Accuracy
(Note 4)
MAX5065 No load, V
CC
= +4.75V to +5.5V
or V
IN
= +8V to +28V
No load
MAX5067 No load, V
CC
= +4.75V to +5.5V
or V
IN
= +8V to +28V
STARTUP/INTERNAL REGULATOR
V
CC
Undervoltage Lockout
V
CC
Undervoltage Lockout
Hysteresis
V
CC
Output Accuracy
MOSFET DRIVERS
Output Driver Impedance
Output Driver Source/Sink
Current
Nonoverlap Time
OSCILLATOR AND PLL
Switching Frequency
PLL Lock Range
PLL Locking Time
f
SW
f
PLL
t
PLL
CLKIN = SGND
CLKIN = V
CC
238
475
125
200
250
500
262
525
600
kHz
kHz
µs
R
ON
I
DH
_, I
DL
_
t
NO
C
DH
_
/DL
_ = 5nF
Low or high output
1
4
60
3
Ω
A
ns
V
IN
= +8V to +28V, I
SOURCE
= 0 to 80mA
4.85
UVLO
V
CC
rising
4.0
4.15
200
5.1
5.30
4.5
V
mV
V
0.5952
0.594
0.7936
0.792
0.6
0.6
0.8
0.8
0.6048
0.6064
0.8064
0.808
V
V
IN
I
Q
η
Short IN and V
CC
together for +5V input
operation
EN = V
CC
or SGND
I
LOAD
= 52A (26A per phase)
4.75
4
90
28
5.50
10
V
mA
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Dual-Phase, +0.6V to +3.3V Output Parallelable,
Average-Current-Mode Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V, circuit of Figure 1, T
A
= -40°C to +85°C, unless otherwise noted. Typical specifications are at T
A
= +25°C.) (Note 1)
PARAMETER
CLKOUT Phase Shift
(At f
SW
= 125kHz)
CLKIN Input Pulldown Current
CLKIN High Threshold
CLKIN Low Threshold
CLKIN High Pulse Width
PHASE High Threshold
PHASE Low Threshold
PHASE Input Bias Current
CLKOUT Output Low Level
CLKOUT Output High Level
CURRENT LIMIT
Average Current-Limit Threshold
Reverse Current-Limit Threshold
Cycle-by-Cycle Current Limit
Cycle-by-Cycle Overload
Response Time
CURRENT-SENSE AMPLIFIER
CSP_ to CSN_ Input Resistance
Common-Mode Range
Input Offset Voltage
Amplifier Gain
3dB Bandwidth
Transconductance
Open-Loop Gain
Common-Mode Voltage Range
DIFF Output Voltage
Input Offset Voltage
Amplifier Gain
3dB Bandwidth
Minimum Output Current Drive
SENSE+ to SENSE- Input
Resistance
R
CS
_
V
CMR(CS)
V
OS(CS)
A
V(CS)
f
3dB
gm
ca
A
VOL(CE)
V
CMR(DIFF)
V
CM
V
OS(DIFF)
A
V(DIFF)
f
3dB
I
OUT(DIFF)
R
VS
_
C
DIFF
= 20pF
1.0
50
100
V
SENSE+
= V
SENSE-
= 0
-1
0.997
1
3
No load
-0.3
0.6
+1
1.003
-0.3
-1
18
4
550
50
+1.0
4
+3.6
+1
kΩ
V
mV
V/V
MHz
µS
dB
V
V
mV
V/V
MHz
mA
kΩ
V
CL
V
CLR
V
CLPK
t
R
CSP_ to CSN_
CSP_ to CSN_
CSP_ to CSN_ (Note 3)
V
CSP
_ to V
CSN
_ = +150mV
45
-3.9
90
112
260
48
51
-0.2
130
mV
mV
mV
ns
SYMBOL
PHASE = V
CC
CONDITIONS
PHASE = unconnected
PHASE = SGND
I
CLKIN
V
CLKINH
V
CLKINL
t
CLKIN
V
PHASEH
V
PHASEL
I
PHASEBIAS
V
CLKOUTL
I
SINK
= 2mA (Note 2)
4.5
V
CLKOUTH
I
SOURCE
= 2mA (Note 2)
-50
200
4
1
+50
100
MIN
115
85
55
3
2.4
0.8
TYP
120
90
60
5
MAX
125
95
65
7
µA
V
V
ns
V
V
µA
mV
V
degrees
UNITS
MAX5065/MAX5067
φ
CLKOUT
CURRENT-ERROR AMPLIFIER (TRANSCONDUCTANCE AMPLIFIER)
DIFFERENTIAL VOLTAGE AMPLIFIER (DIFF)
_______________________________________________________________________________________
3
Dual-Phase, +0.6V to +3.3V Output Parallelable,
Average-Current-Mode Controllers
MAX5065/MAX5067
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V, circuit of Figure 1, T
A
= -40°C to +85°C, unless otherwise noted. Typical specifications are at T
A
= +25°C.) (Note 1)
PARAMETER
Open-Loop Gain
Unity-Gain Bandwidth
EAN Input Bias Current
Error-Amplifier Output Clamping
Voltage
SYMBOL
A
VOL(EA)
f
UGEA
I
B(EA)
V
EAN
= +2.0V
-100
810
CONDITIONS
MIN
TYP
70
3
+100
918
MAX
UNITS
dB
MHz
nA
mV
VOLTAGE-ERROR AMPLIFIER (EAOUT)
V
CLAMP(EA)
With respect to V
CM
POWER-GOOD, PHASE FAILURE DETECTION, OVERVOLTAGE PROTECTION, AND THERMAL SHUTDOWN
V
OV
PGOOD Trip Level (MAX5067)
V
UV
PGOOD Output Low Level
(MAX5067)
PGOOD Output Leakage Current
(MAX5067)
Phase Failure Trip Threshold
(MAX5067)
OVPIN Trip Threshold (MAX5067)
OVPIN Input Resistance
(MAX5067)
THERMAL SHUTDOWN
Thermal Shutdown
Thermal-Shutdown Hysteresis
EN INPUT
EN Input Low Voltage
EN Input High Voltage
EN Pullup Current
V
ENL
V
ENH
I
EN
3
4.5
5
5.5
1
V
V
µA
T
SHDN
150
8
°C
°C
V
PGLO
I
PG
V
PH
OVP
TH
R
OVPIN
PGOOD goes low when V
OUT
is outside this
window
I
SINK
= 4mA
PGOOD = V
CC
PGOOD goes low when CLP_ is higher
than V
PH
With respect to SGND
0.792
190
2
0.8
280
0.808
370
-12.5
-10
-8.5
0.2
1
V
µA
V
V
kΩ
PGOOD goes low when V
OUT
is outside this
window
+6
+8
+10
%V
OUT
Note 1:
Note 2:
Note 3:
Note 4:
Specifications from -40°C to 0°C are guaranteed by characterization but not production tested.
Guaranteed by design. Not production tested.
See
Peak-Current Comparator
section.
Does not include an error due to finite error amplifier gain. See the
Voltage-Error Amplifier
section.
4
_______________________________________________________________________________________
Dual-Phase, +0.6V to +3.3V Output Parallelable,
Average-Current-Mode Controllers
Typical Operating Characteristics
(Circuit of Figure 1. T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
AND INPUT VOLTAGE
MAX5065/67 toc02
MAX5065/MAX5067
EFFICIENCY vs. OUTPUT CURRENT AND
INTERNAL OSCILLATOR FREQUENCY
MAX5065/67 toc01
EFFICIENCY vs. OUTPUT CURRENT
AND INPUT VOLTAGE
100
90
80
70
V
IN
= +12V
V
IN
= +5V
η
(%)
100
90
80
70
60
50
40
30
20
V
OUT
= +1.8V
f
SW
= 250kHz
0 4 8 12 16 20 24 28 32 36 40 44 48 52
I
OUT
(A)
10
0
90
80
η
(%)
70
60
50
40
f = 500kHz
f = 250kHz
V
IN
= +12V
V
IN
= +5V
η
(%)
60
50
40
30
20
V
IN
= +5V
V
OUT
= +1.8V
0 4 8 12 16 20 24 28 32 36 40 44 48 52
I
OUT
(A)
10
0
V
OUT
= 1V
f
SW
= 250kHz
0 4 8 12 16 20 24 28 32 36 40 44 48 52
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
MAX5065/67 toc04
EFFICIENCY vs. OUTPUT CURRENT
AND OUTPUT VOLTAGE
MAX5065/67 toc05
EFFICIENCY vs. OUTPUT CURRENT
AND OUTPUT VOLTAGE
90
80
70
η
(%)
60
50
40
30
20
V
OUT
= +1V
V
OUT
= +1.5V
V
OUT
= +1.8V
MAX5065/67 toc06
100
90
80
70
η
(%)
100
90
80
70
η
(%)
60
50
40
30
V
OUT
= +1V
V
OUT
= +1.5V
V
OUT
= +1.8V
100
60
50
40
30
20
10
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52
I
OUT
(A)
V
IN
= +24V
V
OUT
= +1.8V
f
SW
= 125kHz
20
10
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52
OUTPUT CURRENT (A)
V
IN
= +12V
f
SW
= 250kHz
10
0
V
IN
= +12V
f
SW
= 500kHz
0 4 8 12 16 20 24 28 32 36 40 44 48 52
OUTPUT CURRENT (A)
SUPPLY CURRENT
vs. FREQUENCY AND INPUT VOLTAGE
MAX5065/67 toc07
SUPPLY CURRENT
vs. TEMPERATURE AND FREQUENCY
MAX5065/67 toc08
SUPPLY CURRENT
vs. LOAD CAPACITANCE PER DRIVER
90
80
70
I
CC
(mA)
60
50
40
30
MAX5065/67 toc09
12.0
11.5
11.0
10.5
I
CC
(mA)
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
V
IN
= +12V
100
90
80
70
I
CC
(mA)
60
50
40
30
20
125kHz
250kHz
100
V
IN
= +24V
V
IN
= +5V
EXTERNALCLOCK
NO DRIVER LOAD
10
0
V
IN
= +12V
C
DL_
= 22nF
C
DH_
= 8.2nF
-40
-15
10
35
60
85
20
10
0
1
3
5
7
9
11
13
15
C
DRIVER
(nF)
V
IN
= +12V
f
SW
= 250kHz
100 150 200 250 300 350 400 450 500 550 600
FREQUENCY (kHz)
TEMPERATURE (°C)
_______________________________________________________________________________________
MAX5065/67 toc03
100
5
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