19-3583; Rev 2; 7/05
0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers
General Description
The MAX5060/MAX5061 pulse-width modulation (PWM)
DC-DC controllers provide high-output-current capability
in a compact package with a minimum number of exter-
nal components. These devices utilize an average-cur-
rent-mode control that enables optimal use of low
R
DS(ON)
MOSFETs, eliminating the need for external
heatsinks even when delivering high output currents.
Differential sensing (MAX5060) enables accurate control
of the output voltage, while adaptive voltage positioning
provides optimum transient response. An internal regula-
tor enables operation with 4.75V to 5.5V or 7V to 28V
input voltage ranges. The high switching frequency, up
to 1.5MHz, allows the use of low-output inductor values
and input capacitor values. This accommodates the use
of PC-board-embedded planar magnetics.
The MAX5060 features a clock output with 180° phase
delay to control a second out-of-phase converter for
lower capacitor ripple currents. The MAX5060 also limits
the reverse current if the bus voltage becomes higher
than the regulated output voltage. The MAX5060 is
specifically designed to limit current sinking when multi-
ple power-supply modules are paralleled. The
MAX5060/MAX5061 offer an adjustable 0.6V to 5.5V out-
put voltage. The MAX5060 offers an overvoltage protec-
tion, power-good signal, and an output enable function.
The MAX5060/MAX5061 operate over the automotive
temperature range (-40°C to +125°C). The MAX5060 is
available in a 28-pin thin QFN package while the
MAX5061 is available in a 16-pin TSSOP package.
Features
♦
4.75V to 5.5V or 7V to 28V Input Voltage Range
♦
Adjustable Output Voltage from 0.6V to 5.5V
♦
Up to 30A Output Current
♦
Can Parallel Outputs For Higher Output Current
♦
Programmable Adaptive Output Voltage
Positioning
♦
True-Differential Remote Output Sensing
(MAX5060)
♦
Average-Current-Mode Control
• Superior Current Sharing Between Paralleled
Modules
• Accurate Current Limit Eliminates MOSFET
and Inductor Derating
♦
Limits Reverse Current Sinking in Paralleled
Modules (MAX5060)
♦
Programmable Switching Frequency from 125kHz
to 1.5MHz
♦
Integrated 4A Gate Drivers
♦
Clock Output for 180° Out-of-Phase Operation
(MAX5060)
♦
Voltage Signal Proportional to Output Current for
Load Monitoring (MAX5060)
♦
Output Overvoltage Crowbar Protection
(MAX5060)
♦
Programmable Hiccup Current-Limit Threshold
and Response Time
♦
Overtemperature Thermal Shutdown
MAX5060/MAX5061
Applications
Servers and Workstations
Point-of-Load Telecom DC-DC Regulators
Networking Systems
RAID Systems
High-End Desktop Computers
Ordering Information
PART
MAX5060ATI
MAX5060ETI
MAX5061EUE
TEMP RANGE
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 TQFN-EP*
28 TQFN-EP*
16 TSSOP-EP*
16 TSSOP-EP*
PKG
CODE
T2855-3
T2855-3
U16E-3
U16E-3
Selector Guide
PART
OUTPUT
Average-Current-Mode DC-DC Controller
for 5V/12V/24V Input Bus with CLKOUT,
Load Monitoring, Overvoltage, EN Input,
SYNC Input, and PGOOD Output
Average-Current-Mode DC-DC Controller
for 5V/12V/24V Input with SYNC/ENABLE
Input
MAX5060
MAX5061AUE
-40°C to +125°C
*EP
= Exposed pad.
Pin Configurations appear at end of data sheet.
MAX5061
________________________________________________________________
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.
0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers
MAX5060/MAX5061
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 (MAX5060).............................-0.3V to (V
DD
+ 0.3V)
DL to PGND (MAX5061).............................-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
Current Sink in PGOOD ........................................................6mA
*Per
JEDEC 51 standard.
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.
All Other Pins to SGND...............................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TSSOP (derate 21.3mW/°C above +70°C)* ......1702mW
28-Pin TQFN (derate 34.5mW/°C above +70°C)* ......2758mW
Operating Temperature Range
MAX5060A_ _ and MAX5061A_ _ .................-40°C to +125°C
MAX5060E_ _ and MAX5061E_ _ ....................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
CC
= 5V, V
DD
= V
CC
(MAX5060 only), T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted. Typical specifications are at T
A
= +25°C.)
(Note 1)
PARAMETER
SYSTEM SPECIFICATIONS
7
Input Voltage Range
Quiescent Supply Current
Efficiency
OUTPUT VOLTAGE
SENSE+ to SENSE- Accuracy
(MAX5060) (Note 2)
Soft-Start Time
EAN Reference Voltage
(MAX5061)
STARTUP/INTERNAL REGULATOR
V
CC
Undervoltage Lockout
V
CC
Undervoltage Lockout
Hysteresis
V
CC
Output Voltage
MOSFET DRIVERS
Output-Driver Impedance
Output-Driver Source/Sink Current
Nonoverlap Time
R
ON
I
DH_
, I
DL_
t
NO
C
DH/DL
= 5nF
Low or high output,
I
SOURCE/SINK
= 20mA
1.1
4
35
3
Ω
A
ns
V
IN
= 7V to 28V, I
SOURCE
= 0 to 60mA
4.85
UVLO
V
CC
rising
4.1
4.3
200
5.1
5.30
4.5
V
mV
V
t
SS
No load, V
CC
= 4.75V to 5.5V,
no switching
No load, V
IN
= 7V to 28V, no switching
0.591
0.591
No load, V
CC
= 4.75V to 5.5V,
f
SW
= 500kHz
No load, V
IN
= 7V to 28V, f
SW
= 500kHz
0.594
0.594
0.6
0.6
1024
0.6
0.6
0.606
0.606
0.606
0.606
Clock
Cycles
V
V
V
IN
I
Q
η
Short IN and V
CC
together for 5V input
operation
EN = V
CC
or SGND, not switching
I
LOAD
= 20A, V
IN
= 12V, V
OUT
= 3.3V
4.75
2.7
90
28
5.50
5.5
V
mA
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
REF
2
_______________________________________________________________________________________
0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, V
DD
= V
CC
(MAX5060 only), T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted. Typical specifications are at T
A
= +25°C.)
(Note 1)
PARAMETER
OSCILLATOR
Switching Frequency Range
R
T
= 500kΩ
Switching Frequency
f
SW
R
T
= 120kΩ
R
T
= 39.9kΩ
Switching Frequency Accuracy
CLKOUT Phase Shift (MAX5060)
CLKOUT Output Low Level
(MAX5060)
CLKOUT Output High Level
(MAX5060)
SYNC Input-High Pulse Width
SYNC Input Clock High Threshold
SYNC Input Clock Low Threshold
SYNC Pullup Current
SYNC Power-Off Level
CURRENT LIMIT
Average Current-Limit Threshold
Reverse Current-Limit Threshold
Cycle-by-Cycle Current Limit
Cycle-by-Cycle Overload
Response Time
Hiccup Divider Ratio
Hiccup Reset Delay
LIM Input Impedance
CURRENT-SENSE AMPLIFIER
CSP to CSN Input Resistance
Common-Mode Range
Input Offset Voltage
Amplifier Gain
3dB Bandwidth
R
CS
V
CMR(CS)
V
OS(CS)
A
V(CS)
f
3dB
V
IN
= 7V to 28V
0
0.1
34.5
4
4
5.5
kΩ
V
mV
V/V
MHz
LIM to SGND
V
CL
V
CLR
CSP to CSN
CSP to CSN (MAX5060)
CSP to CSN
V
CSP
to V
CSN
= 75mV
LIM to V
CM
, no switching
0.547
24.0
-3.2
26.9
-2.3
60
260
0.558
200
55.9
0.565
28.2
-0.1
mV
mV
mV
ns
V/V
ms
kΩ
φ
CLKOUT
V
CLKOUTL
V
CLKOUTH
t
SYNC
V
SYNCH
V
SYNCL
I
SYNC
_
OUT
V
SYNC
_
OFF
120kΩ
≤
R
T
≤
500kΩ
40kΩ
≤
R
T
≤
120kΩ
f
SW
= 125kHz
I
SINK
= 2mA
I
SOURCE
= 2mA
RT/SYNC (MAX5060), RT/SYNC/EN
(MAX5061)
RT/SYNC (MAX5060), RT/SYNC/EN
(MAX5061)
RT/SYNC (MAX5060), RT/SYNC/EN
(MAX5061)
V
RT/SYNC
= 0V (MAX5060),
V
RT/SYNC/EN
= 0V (MAX5061)
250
4.5
200
2.0
0.4
750
0.4
125
121
495
1515
-5
-8
180
0.4
125
521
1620
1500
129
547
1725
+5
+8
%
degrees
V
V
ns
V
V
µA
V
kHz
kHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5060/MAX5061
_______________________________________________________________________________________
3
0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers
MAX5060/MAX5061
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, V
DD
= V
CC
(MAX5060 only), T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted. Typical specifications are at T
A
= +25°C.)
(Note 1)
PARAMETER
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
Gain-Bandwidth Product
3dB Bandwidth
Output Sink Current
Output Source Current
Maximum Load Capacitance
V_IOUT Output to I
OUT
Transfer
Function
Offset Voltage
VOLTAGE-ERROR AMPLIFIER (EAOUT)
Open-Loop Gain
Unity-Gain Bandwidth
EAN Input Bias Current
Error-Amplifier Output-Clamping
Voltage
A
VOLEA
f
GBW
V
EAN
= 2.0V (MAX5060)
I
B(EA)
V
EAN
= 0.4V, V
EAOUT
= GND
(MAX5061)
With respect to V
CM
(MAX5060),
with respect to SGND (MAX5061)
-0.2
0.03
+0.2
µA
70
3
dB
MHz
R
SENSE
= 1mΩ,
100mV
≤
V_IOUT
≤
5.5V
132.3
SYMBOL
g
C
A
VOL(CE)
V
CMR(DIFF)
V
CM
V
OS(DIFF)
A
V(DIFF)
f
3dB
I
OUT(DIFF)
R
VS
V
SENSE-
= 0V
C
DIFF
= 20pF
4
50
100
V
SENSE+
= V
SENSE-
= 0V
-1
0.994
1
3
No load
0
0.6
+1
1.006
CONDITIONS
MIN
TYP
550
50
+1.0
MAX
UNITS
µS
dB
V
V
mV
V/V
MHz
mA
kΩ
CURRENT-ERROR AMPLIFIER (Transconductance Amplifier)
DIFFERENTIAL VOLTAGE AMPLIFIER (DIFF, MAX5060 only)
V_IOUT AMPLIFIER (V_IOUT, MAX5060 only)
V
V_IOUT
= 2.0V
V
V_IOUT
= 2.0V
30
90
50
135
1
137.7
4
1.0
MHz
MHz
µA
µA
pF
mV/A
mV
V
CLAMP(EA)
883
930
976
mV
POWER-GOOD AND OVERVOLTAGE PROTECTION (MAX5060 only)
PGOOD Trip Level
PGOOD Output Low Level
PGOOD Output Leakage Current
OVI Trip Threshold
OVI Input Bias Current
V
UV
V
PGLO
I
PG
OVP
TH
I
OVI
PGOOD goes low when V
OUT
is below
this threshold
I
SINK
= 4mA
PGOOD = V
CC
With respect to SGND
1.244
1.276
0.2
87.5
90
92.5
0.4
1
1.308
%V
OUT
V
µA
V
µA
4
_______________________________________________________________________________________
0.6V to 5.5V Output, Parallelable,
Average-Current-Mode DC-DC Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, V
DD
= V
CC
(MAX5060 only), T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted. Typical specifications are at T
A
= +25°C.)
(Note 1)
PARAMETER
ENABLE INPUTS
EN Input High Voltage (MAX5060)
EN Input Hysteresis (MAX5060)
EN Pullup Current (MAX5060)
RT/SYNC/EN Input High Voltage
Enable (MAX5061)
RT/SYNC/EN Input Low Voltage
Disable (MAX5061)
THERMAL SHUTDOWN
Thermal Shutdown
Thermal-Shutdown Hysteresis
Temperature rising
+150
30
°C
°C
I
EN
V
RT/SYNC/EN
_
H
V
RT/SYNC/EN
_
L
13.5
1.6
0.4
V
EN
EN rising
2.437
2.5
0.28
15
16.5
2.562
V
V
µA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5060/MAX5061
Note 1:
Specifications at T
A
= +25°C are 100% tested. Specifications over the temperature range are guaranteed by design.
Note 2:
Does not include an error due to finite error amplifier gain (see the
Voltage-Error Amplifier
section).
_______________________________________________________________________________________
5
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