max5066auit Maxim Integrated Products, Inc., max5066auit Datasheet

max5066auit

Manufacturer Part Number

max5066auit

Description

Max5066 Configurable, Single-/dual-output, Synchronous Buck Controller For High-current Applications

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX5066AUIT.pdf (22 pages)

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The MAX5066 is a two-phase, configurable single- or

dual-output buck controller with an input voltage range of

4.75V to 5.5V or from 5V to 28V. Each phase of the

MAX5066 is designed for 180° operation. A mode pin

allows for a dual-output supply or connecting two phases

together for a single-output, high-current supply. Each

output channel of the MAX5066 drives n-channel

MOSFETs and is capable of providing more than 25A of

load current. The MAX5066 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 volt-

age ripple in dual-phase, single-output voltage applica-

tions. Each buck regulator output has its own high-

performance current and voltage-error amplifier that can

be compensated for optimum output filter L-C values and

transient response.

The MAX5066 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 MAX5066 can be synchronized to an exter-

nal clock. Each output voltage is adjustable from 0.61V to

5.5V. Additional features include thermal shutdown, “hic-

cup mode” short-circuit protection. Use the MAX5066

with adaptive voltage positioning for applications that

require a fast transient response, or accurate output volt-

age regulation.

The MAX5066 is available in a thermally enhanced 28-pin

TSSOP package capable of dissipating 1.9W. The device

is rated for operation over the -40°C to +85°C extended,

or -40°C to +125°C automotive temperature range.

19-3661; Rev 1; 8/05

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.

Configurable, Single-/Dual-Output, Synchronous

Buck Controller for High-Current Applications

High-End Desktop Computers

Graphics Cards

Networking Systems

Point-of-Load High-Current/High-Density

Telecom DC-DC Regulators

RAID Systems

________________________________________________________________ Maxim Integrated Products

General Description

Applications

♦ 4.75V to 5.5V or 5V to 28V Input

♦ Dual-Output Synchronous Buck Controller

♦ Configurable for Two Separate Outputs or One

♦ Each Output is Capable of Up to 25A Output

♦ Average Current-Mode Control Provides Accurate

♦ 180° Interleaved Operation Reduces Size of Input

♦ Limits Reverse Current Sinking When Operated in

♦ Each Output is Adjustable from 0.61V to 5.5V

♦ Independently Programmable Adaptive Voltage

♦ Independent Shutdown for Each Output

♦ 100kHz to 1MHz per Phase Programmable

♦ Oscillator Frequency Synchronization from

♦ Hiccup Mode Overcurrent Protection

♦ Overtemperature Shutdown

♦ Thermally Enhanced 28-Pin TSSOP Package

♦ Operates Over -40°C to +85°C or -40°C to +125°C

*Exposed Pad

MAX5066EUI

MAX5066AUI

Single Output

Current

Current Limit

Filter Capacitors

Parallel Mode

Positioning

Switching Frequency

200kHz to 2MHz

Capable of Dissipating 1.9W

Temperature Range

PART

-40°C to +125°C

-40°C to +85°C

TEMP RANGE

Ordering Information

PIN-PACKAGE

28 TSSOP-EP*

Features

Related parts for max5066auit

max5066auit Summary of contents

Page 1

Rev 1; 8/05 Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications General Description The MAX5066 is a two-phase, configurable single- or dual-output buck controller with an input voltage range of 4.75V to 5.5V or from 5V to 28V. Each ...

Page 2

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications ABSOLUTE MAXIMUM RATINGS IN 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 V ...

Page 3

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications ELECTRICAL CHARACTERISTICS (continued +5V REG DD EN_ A (Note 1) PARAMETER SYMBOL OSCILLATOR Switching Frequency Switching Frequency Accuracy RT/CLKIN Output ...

Page 4

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications ELECTRICAL CHARACTERISTICS (continued +5V REG DD EN_ A (Note 1) PARAMETER SYMBOL CURRENT-ERROR AMPLIFIER (CEA_) Transconductance Open-Loop Gain A VOL(CEA) ...

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 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 REF LINE REGULATION 3.303 3.302 REF 3.301 3.300 3.299 3.298 I = 200µA REF 3.297 3.296 5 ...

Page 7

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications (Circuit of Figure +25°C, unless otherwise noted LOW-SIDE DRIVER FALL TIME (V = 12V LOAD 20ns/div TURN-ON/-OFF WAVEFORMS ( 10A) OUT1 OUT2 ...

Page 8

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications PIN NAME Current-Sense Differential Amplifier Negative Input for Output2. Connect CSN2 to the negative 1 CSN2 terminal of the sense resistor. The differential voltage between CSP2 and CSN2 is internally amplified by ...

Page 9

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications PIN NAME Current-Sense Differential Amplifier Negative Input for Output1. Connect CSN1 to the negative 14 CSN1 terminal of the sense resistor. The differential voltage between CSP1 and CSN1 is internally amplified by ...

Page 10

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 REF 3.3V UV33 REF V = 0.61V INTREF EN2 ...

Page 11

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications Finally, a thermal-shutdown feature protects the device during thermal faults and shuts down the MAX5066 when the die temperature exceeds +160°C. Dual-Output/Dual-Phase Select (MODE) The MAX5066 can operate as a dual-output indepen- ...

Page 12

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications Hiccup Fault Protection The MAX5066 includes overload fault protection circuit- ry that prevents damage to the power MOSFETs. The fault protection consists of two digital fault integration blocks that enable “hiccuping” under ...

Page 13

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications oscillator. The PWM on-cycle terminates when the ramp voltage exceeds the error voltage from the current-error amplifier (CEA1). The outer voltage control loop consists of the voltage- error amplifier (VEA1). The noninverting ...

Page 14

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications 52.5mV CLP_ CSP_ g M CSN_ GM IN RAMP (V/S) SW CLK 1.225V EN_ Figure 3. Current Comparator and MOSFET Driver Logic V OUT R ...

Page 15

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 D3 C6 (1A, 30V) 680µF R4 1.74kΩ R5 4.64kΩ R16 REG REF 100kΩ R17 100kΩ EXTERNAL FREQUENCY ...

Page 16

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 D3 C6 (1A, 30V) 680µF R4 5.11kΩ R5 4.75kΩ R16 REG REF 100kΩ R17 100kΩ EXTERNAL FREQUENCY ...

Page 17

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications prevent shoot-through currents during transition. shows the dual-phase, single-output buck regulator. Design Procedures Inductor Selection The switching frequency per phase, peak-to-peak ripple current in each phase, and allowable voltage ripple at the ...

Page 18

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 19

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 20

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications × REVERSE R SENSE Output-Voltage Setting The output voltage is set by the combination of resistors R1, R2, and R as described in the Voltage Error Amplifier ...

Page 21

Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications Calculate C such that: CFF CFF × × π × C where C is C11 and C13 in Figure 6. CFF Applications Information Independant Turn-On and ...

Page 22

... Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products © 2005 Maxim Integrated Products Printed USA Printed USA is a registered trademark of Maxim Integrated Products, Inc registered trademark of Maxim Integrated Products, Inc. Package Information PACKAGE OUTLINE, TSSOP, 4.40 MM BODY, EXPOSED PAD 1 E ...

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