MAX15034BEVKIT+ Maxim Integrated Products, MAX15034BEVKIT+ Datasheet

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MAX15034BEVKIT+

Manufacturer Part Number
MAX15034BEVKIT+
Description
KIT EVALUATION FOR MAX15034
Manufacturer
Maxim Integrated Products
Datasheets
1.MAX15034BAUI.pdf (25 pages)
2.MAX15034BEVKIT.pdf (1 pages)

Specifications of MAX15034BEVKIT+

Main Purpose
DC/DC, Step Down
Voltage - Input
5 ~ 28V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
MAX15034
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Voltage - Output
-
Power - Output
-
Frequency - Switching
-
Outputs And Type
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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.
19-4218; Rev 0; 7/08
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.
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
High-End Computers/Workstations/Servers
Graphics Cards
Networking Systems
Point-of-Load High-Current/High-Density
Telecom DC-DC Regulators
RAID Systems
________________________________________________________________ Maxim Integrated Products
General Description
Applications
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
o Average Current-Mode Control with Accurate
o 180° Interleaved Operation Reduces Size of Input
o Limits Reverse Current Sinking When Operated in
o Each Output is Adjustable from 0.61V to 5.5V
o Independently Programmable Adaptive Voltage
o Monotonic Startup into Prebiased Outputs
o Independent Shutdown for Each Output
o 100kHz to 1MHz per Phase Programmable
o Oscillator Frequency Synchronization from
o Digital Soft-Start on Outputs
o Hiccup-Mode Overcurrent Protection
o Overtemperature Shutdown
o Thermally Enhanced 28-Pin TSSOP Package
+ Denotes a lead-free/RoHS-compliant package.
* EP = Exposed pad.
MAX15034AAUI+
MAX15034BAUI+
One Single Output (50A)
Adjustable Current Limit
Filter Capacitors
Parallel Mode
Positioning
Switching Frequency
200kHz to 2MHz
Capable of Dissipating 2.1W
PART
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
Ordering Information
PIN-PACKAGE
28 TSSOP
28 TSSOP-EP*
Features
1

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MAX15034BEVKIT+ Summary of contents

Page 1

... Graphics Cards Networking Systems Point-of-Load High-Current/High-Density Telecom DC-DC Regulators RAID Systems ________________________________________________________________ Maxim Integrated Products 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. o 4.75V to 5. 28V Input o Dual-Output Synchronous Buck Controller o Configurable for Two Separate Outputs (25A) or ...

Page 2

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications ABSOLUTE MAXIMUM RATINGS IN, LX_ to AGND.....................................................-0.3V to +30V BST_ to AGND........................................................-0.3V to +35V DH_ to LX_ ....................................-0. DL_ to PGND ..............................................-0. BST_ to LX_ ..............................................................-0.3V to +6V ...

Page 3

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications ELECTRICAL CHARACTERISTICS (continued +5V REG DD EN_ A (Note 2) PARAMETER SYMBOL Nonoverlap Time (Dead Time) RT/CLKIN Output Voltage V ...

Page 4

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications ELECTRICAL CHARACTERISTICS (continued +5V REG DD EN_ A (Note 2) PARAMETER SYMBOL -3dB Bandwidth CSP_ Input Bias Current CURRENT-ERROR AMPLIFIER ...

Page 5

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications (Circuit of Figure +25°C, unless otherwise noted OSCILLATOR FREQUENCY vs 10,000 DH_ DL_ 1000 100 10 0 100 200 300 ...

Page 6

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications (Circuit of Figure +25°C, unless otherwise noted DRIVER RISE TIME vs. LOAD CAPACITANCE 100 90 80 DH_ ...

Page 7

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications (Circuit of Figure +25°C, unless otherwise noted OUT1/OUT2 OUT-OF-PHASE WAVEFORMS (V = 0.8V 1.3V) OUT1 OUT2 MAX15034 toc14 10μs/div SHORT-CIRCUIT CURRENT WAVEFORMS (V = 5V) ...

Page 8

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications (Circuit of Figure +25°C, unless otherwise noted INTERNAL AVERAGE CURRENT LIMIT vs. TEMPERATURE -40 -25 - ...

Page 9

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications PIN NAME Current-Sense Differential Amplifier Negative Input for Output 2. Connect CSN2 to the negative terminal of 1 CSN2 the sense resistor. The differential voltage between CSP2 and CSN2 is internally amplified ...

Page 10

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications PIN NAME Output 1 Enable. A logic-low shuts down channel 1’s MOSFET drivers. EN1 can be used for output 15 EN1 sequencing. Boost Flying-Capacitor Connection. Reservoir capacitor connection for the high-side MOSFET ...

Page 11

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications CLP1 10 EAOUT1 12 EAN1 11 UVLO REG FOR INTERNAL 21 REG BIASING EN1 15 AVGLIMIT 0.61V INTREF EN2 28 8 AGND VEA2 4 ...

Page 12

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications Dual-Output/Dual-Phase Select (MODE) The MAX15034 can operate as a dual-output, indepen- dently regulated buck converter dual-phase, single-output buck converter. The MODE input selects between the two operating modes. When ...

Page 13

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications Hiccup Fault Protection The MAX15034 includes overload fault protection circuitry that prevents damage to the power MOSFETs. The fault protection consists of two digital fault integration blocks that enable hiccuping under overcurrent ...

Page 14

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications The outer voltage control loop consists of the voltage- error amplifier (VEA1). The noninverting input (EAN1) is externally connected to the midpoint of a resistive volt- age-divider from OUT1 to EAN1 to ...

Page 15

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications CLP_ A = 36V/V V CSP_ g CSN_ GM IN RAMP (V/S) SW CLK 1.225V EN_ Figure 3. Current Comparator and MOSFET Driver Logic V OUT R 1 EAN_ ...

Page 16

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications D1 (100mA, 30V) C2 1μF C8 0.1μ 0.5μH 2mΩ 0.8V/10A C6 680μF R4 1.74kΩ R5 4.64kΩ V R16 REG 100kΩ R17 100kΩ EXTERNAL FREQUENCY SYNC Figure 6. Dual-Output Buck Regulator ...

Page 17

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications D1 (100mA, 30V) C2 1μF C8 0.1μ 0.8μH 2mΩ 1.3V/20A C6 680μF R4 5.11kΩ R5 4.75kΩ V R16 REG 100kΩ R17 100kΩ EXTERNAL FREQUENCY SYNC Figure 7. Dual-Phase, Single-Output Buck ...

Page 18

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications Design Procedures Inductor Selection The switching frequency per phase, peak-to-peak ripple current in each phase, and allowable voltage ripple at the output, determine the inductance value. Selecting higher switching frequencies reduces the ...

Page 19

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications Table 1. High-Side MOSFET Losses LOSS DESCRIPTION Losses associated with MOSFET on-time and Conduction Loss on-resistance. I RMS and duty cycle. Losses associated with charging and discharging the gate capacitance of the ...

Page 20

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications Table 2. Low-Side MOSFET Losses LOSS DESCRIPTION Losses associated with MOSFET on-time, I Conduction Loss is a function of load current and duty cycle. Losses associated with charging and discharging the gate ...

Page 21

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications LX_ MAX15034 CSP_ CSN_ Figure 8. Noninductive Resistive Sense LX_ MAX15034 CSP_ CSN_ Figure 9. Lossless Inductor Sense Set the RC time constant to be 1.1 to 1.2 times the inductor time ...

Page 22

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications LX_ MAX15034 CSP_ CSN_ Figure 10. Inductive Sense Resistor The MAX15034 provides precision average current-limit programmability while using standard sense resistors or shunts. Use the equation below to determine the appropriate V ...

Page 23

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications Reverse Current Limit The MAX15034 limits the reverse current when the out- put capacitor voltage is higher than the preset output voltage. Calculate the maximum reverse current limit based on V and ...

Page 24

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications In practical applications, pick the crossover frequency ( the range of < < First calculate R in equation 2 above. Calculate ...

Page 25

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 25 © 2008 Maxim Integrated Products ...

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