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MAX15034AAUI+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
General Description
The MAX15034 two-phase, configurable single- or dual-
output buck controller has an input voltage range of
4.75V to 5.5V or 5V to 28V. A mode select input allows
for a dual-output supply or connecting two phases
together for a single-output, high-current supply. Each
output channel of the MAX15034 drives n-channel
MOSFETs and is capable of providing more than 25A of
load current. The MAX15034 uses average current-
mode control with a switching frequency up to 1MHz
per phase where each phase is 180° out of phase with
respect to the other. Out-of-phase operation results in
significantly reduced input capacitor ripple current and
output voltage ripple in dual-phase, single-output volt-
age applications. Each controller has its own high-per-
formance current and voltage-error amplifier that can
be compensated for optimum output filter L-C values
and transient response.
The MAX15034 offers two enable inputs with accurate
turn-on thresholds to allow for output voltage sequencing
of the two outputs. The device’s switching frequency can
be programmed from 100kHz to 1MHz with an external
resistor. The MAX15034 can be synchronized to an
external clock. Each output voltage is adjustable from
0.61V to 5.5V. Additional features include thermal shut-
down and hiccup-mode, short-circuit protection. Use the
MAX15034 with adaptive voltage positioning for applica-
tions that require a fast transient response or accurate
output voltage regulation.
The MAX15034 is available in a thermally enhanced 28-
pin TSSOP package capable of dissipating 2.1W. The
device is rated for operation over the -40°C to +125°C
automotive temperature range.
Applications
High-End Computers/Workstations/Servers
Graphics Cards
Networking Systems
Point-of-Load High-Current/High-Density
Telecom DC-DC Regulators
RAID Systems
Features
o 4.75V to 5.5V or 5V to 28V Input
o Dual-Output Synchronous Buck Controller
o Configurable for Two Separate Outputs (25A) or
One Single Output (50A)
o Average Current-Mode Control with Accurate
Adjustable Current Limit
o 180° Interleaved Operation Reduces Size of Input
Filter Capacitors
o Limits Reverse Current Sinking When Operated in
Parallel Mode
o Each Output is Adjustable from 0.61V to 5.5V
o Independently Programmable Adaptive Voltage
Positioning
o Monotonic Startup into Prebiased Outputs
o Independent Shutdown for Each Output
o 100kHz to 1MHz per Phase Programmable
Switching Frequency
o Oscillator Frequency Synchronization from
200kHz to 2MHz
o Digital Soft-Start on Outputs
o Hiccup-Mode Overcurrent Protection
o Overtemperature Shutdown
o Thermally Enhanced 28-Pin TSSOP Package
Capable of Dissipating 2.1W
MAX15034
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4218; Rev 1; 10/11
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.
PART TEMP RANGE PIN-PACKAGE
MAX15034AAUI+ -40°C to +125°C 28 TSSOP
MAX15034BAUI+ -40°C to +125°C 28 TSSOP-EP*
MAX15034BAUI/V+ -40°C to +125°C 28 TSSOP-EP*
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
/V Denotes an automotive qualified part.
EVALUATION KIT
AVAILABLE
MAX15034
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
IN, LX_ to AGND.....................................................-0.3V to +30V
BST_ to AGND........................................................-0.3V to +35V
DH_ to LX_ ....................................-0.3V to (V
BST_
- V
LX_
) + 0.3V
DL_ to PGND..............................................-0.3V to (V
DD
+ 0.3V)
BST_ to LX_ ..............................................................-0.3V to +6V
V
DD
to PGND............................................................-0.3V to +6V
AGND to PGND .....................................................-0.3V to +0.3V
AVGLIMIT, REG, RT/CLKIN, CSP_,
CSN_ to AGND ......................................................-0.3V to +6V
All Other Pins to AGND ............................-0.3V to (V
REG
+ 0.3V)
REG Continuous Output Current
(limited by power dissipation, no thermal or short-circuit
protection).........................................................................67mA
Continuous Power Dissipation (T
A
= +70°C) (Note 1)
28-Pin TSSOP (derate 14mW/°C above +70°C) ..........1117mW
28-Pin TSSOP-EP (derate 27mW/°C above +70°C)........2162mW
Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
ELECTRICAL CHARACTERISTICS
(V
IN
= V
REG
= V
DD
= V
EN_
= +5V, T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted, circuit of Figure 6. Typical values are at T
A
= +25°C.)
(Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SYSTEM SPECIFICATIONS
528
Input Voltage Range V
IN
IN and REG shorted together for +5V
operation
4.75 5.50
V
Quiescent Supply Current I
IN
f
OSC
= 500kHz, DH_ or DL_ = open 7 17 mA
STARTUP/INTERNAL REGULATOR OUTPUT (REG)
REG Undervoltage Lockout UVLO V
REG
rising 4.0 4.15 4.5 V
Hysteresis V
HYST
200 mV
REG Output Accuracy V
IN
= 5.8V to 28V, I
SOURCE
= 0 to 65mA 4.75 5.10 5.30 V
REG Dropout V
IN
< 5.8V, I
SOURCE
= 60mA 0.5 V
INTERNAL REFERENCE
Internal Reference Voltage V
EAN_
EAN_ connected to
EAOUT_
(Note 3)
T
A
= -40°C to +125°C 0.605 0.6125 0.620 V
Digital Ramp Period for Soft-Start 1024
Clock
cycles
Soft-Start Voltage Steps 64 Steps
MOSFET DRIVERS
p-Channel Output Driver
Impedance
R
ON_P
1.35 3 Ω
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TSSOP
Junction-to-Ambient Thermal Resistance (θ
JA
)..................71.6°C/W
Junction-to-Case Thermal Resistance (θ
JC
)......................13°C/W
TSSOP-EP
Junction-to-Ambient Thermal Resistance (θ
JA
)..................37°C/W
Junction-to-Case Thermal Resistance (θ
JC
)......................2°C/W
MAX15034
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
REG
= V
DD
= V
EN_
= +5V, T
A
= T
J
= T
MIN
to T
MAX
, unless otherwise noted, circuit of Figure 6. Typical values are at T
A
= +25°C.)
(Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
n-Channel Output Driver
Impedance
R
ON_N
0.45 1.35 Ω
Output Driver Source Current I
DH_
, I
DL_
2.5 A
Output Driver Sink Current I
DH_
, I
DL_
5A
C
DH_
or C
DL_
= 5nF
-7.5 +7.5
Nonoverlap Time (Dead Time) t
NO
f
SW
= 1MHz nominal, R
RT
= 12.4kΩ -10 +10
%
RT/CLKIN Output Voltage V
RT/CLKIN
1.225 V
RT/CLKIN Current Sourcing
Capability
I
RT/CLKIN
0.5 mA
RT/CLKIN Logic-High Threshold V
RT/CLKIN_H
2.4 V
RT/CLKIN Logic-Low Threshold V
RT/CLKIN_L
0.8 V
RT/CLKIN High Pulse Width t
RT/CLKIN
30 ns
RT/CLKIN Synchronization
Frequency Range
f
RT/CLKIN
200 2000 kHz
CURRENT LIMIT
Internal Average Current-Limit
Threshold
V
CL_
V
CSP_
- V
CSN_
20.4 22.5 24.75 mV
Reverse Average Current-Limit
Threshold
V
RCL_
V
CSP_
- V
CSN_
-3.0 -1.53 -0.1 mV
External Average Current-Limit
Threshold Adjustment
V
CL_ADJ
Resistor-divider connected from REG
to AVGLIMIT to AGND
V
AVGLIMIT
-
0.6/36
V
AVGLIMIT Ground Threshold
Voltage
V
AVGLIMIT_GND
550 mV
Leakage Current at AVGLIMIT I
AVGLIMIT
V
AVGLIMIT
= 3V 100 nA
DIGITAL FAULT INTEGRATION (DF_)
Number of Switching Cycles to
Shutdown in Current Limit
NS
DF_
32,768
Clock
cycles
Number of Switching Cycles to
Recover from Shutdown
NR
DF_
524,288
Clock
cycles
CURRENT-SENSE AMPLIFIER
CSP_ to CSN_ Input Resistance R
CS_
3.8 kΩ
V
IN
= V
REG
= 4.75V to 5.5V or
V
IN
= 5V to 10V
-0.3 +3.6 V
Common-Mode Range V
CMR(CS)
V
IN
= 7V to 28V -0.3 +5.5 V
Input Offset Voltage V
OS(CS)
100 µV
Amplifier Gain A
V(CS)
36 V/V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

MAX15034AAUI+T

Mfr. #:
Buy MAX15034AAUI+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Configurable Synchronous Buck
Lifecycle:
New from this manufacturer.
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