MAX5072EVKIT Maxim Integrated Products, MAX5072EVKIT Datasheet

MAX5072EVKIT

Manufacturer Part Number

MAX5072EVKIT

Description

EVAL KIT FOR MAX5072

Manufacturer

Maxim Integrated Products

Datasheets

1.MAX5072ETJ.pdf (27 pages)

2.MAX5072EVKIT.pdf (9 pages)

Specifications of MAX5072EVKIT

Main Purpose

DC/DC, Step Up or Down

Outputs And Type

2, Non-Isolated

Voltage - Output

3.3V, 12V

Current - Output

2A, 220mA

Voltage - Input

5.5 ~ 16V

Regulator Topology

Boost, Buck

Frequency - Switching

2.2MHz

Board Type

Fully Populated

Utilized Ic / Part

MAX5072

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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The MAX5072 is a dual-output DC-DC converter with inte-

grated high-side n-channel power MOSFETs. Each output

can be configured either as a buck converter or a boost

converter. The MAX5072 is designed to manage the

power requirements of xDSL modems. The wide 5.5V to

23V input voltage range allows for the use of inexpensive

AC adapters to power the device in xDSL modem appli-

cations. Each output is programmable down to 0.8V in the

buck mode and up to 28V in the boost mode with an out-

put voltage accuracy of ±1%. In the buck mode, convert-

er 1 and converter 2 can deliver 2A and 1A, respectively.

The output switching frequency of each converter can be

programmed from 200kHz to 2.2MHz to avoid harmonics

in the xDSL frequency band of operation. Each output

operates 180° out-of-phase, thus reducing input-capaci-

tor ripple current, size, and cost. A SYNC input facilitates

external frequency synchronization. Moreover, a CLKOUT

output provides out-of-phase clock signal with respect to

converter 2, allowing four-phase operation using two

MAX5072 ICs in master-slave configuration.

The MAX5072 includes an internal digital soft-start that

reduces inrush current, eliminates output-voltage over-

shoot, and ensures monotonic rise in output voltage dur-

ing power-up. The device includes a power-good output

and power-on reset as well as manual reset. In addition,

each converter output can be shut down individually. The

MAX5072 features a "dying gasp" output, which goes low

when the input voltage drops below a preprogrammed

voltage. Protection features include output short-circuit

protection for buck mode and maximum duty-cycle limit

for boost operation, as well as thermal shutdown.

The MAX5072 is available in a thermally enhanced 32-pin

thin QFN package that can dissipate 2.7W at +70°C ambi-

ent temperature. The device is rated for operation over the

-40°C to +85°C extended, or -40°C to +125°C automotive

temperature range.

19-3503; Rev 2; 2/06

*EP = Exposed pad.

Ordering Information continued at end of data sheet.

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.

MAX5072ETJ

PART

xDSL Modems

xDSL Routers

Point-of-Load DC-DC Converters

Converter with POR and Power-Fail Output

-40°C to +85°C

TEMP RANGE

________________________________________________________________ Maxim Integrated Products

Ordering Information

General Description

2.2MHz, Dual-Output Buck or Boost

PIN-PACKAGE

32 Thin QFN-EP*

(5mm x 5mm)

Applications

T3255-4

PKG

CODE

♦ 4.5V to 5.5V or 5.5V to 23V Input Supply Voltage

♦ 0.8V (Buck) to 28V (Boost) Output Voltage

♦ Two Independent Output DC-DC Converters with

♦ Each Output can be Configured in Buck or Boost

♦ I

♦ 180° Out-of-Phase Operation

♦ Clock Output for Four-Phase Operation

♦ Switching Frequency Programmable from 200kHz

♦ Digital Soft-Start and Independent Converter

♦ SYNC Input, Power-On Reset, Manual Reset, And

♦ Short-Circuit Protection (Buck)/Maximum Duty-

♦ Thermal Shutdown

♦ Thermally Enhanced 32-Pin Thin QFN Package

Range

Internal Power MOSFETs

Mode

Buck Mode

to 2.2MHz

Shutdown

Power-Fail Output

Cycle Limit (Boost)

Dissipates up to 2.7W at +70°C

OUT1

SOURCE1

SOURCE2

TOP VIEW

PGOOD1

PGND

SGND

PGND

and I

OUT2

of 2A and 1A (Respectively) in

THIN QFN

MAX5072

Pin Configuration

Features

BYPASS

V+

OSC

PFI

SYNC

Related parts for MAX5072EVKIT

MAX5072EVKIT Summary of contents

Page 1

... Exposed pad. Ordering Information continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. ♦ 4.5V to 5.5V or 5.5V to 23V Input Supply Voltage Range ♦ ...

Page 2

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ABSOLUTE MAXIMUM RATINGS V+ to PGND............................................................-0.3V to +25V SGND to PGND .....................................................-0.3V to +0. SGND...................-0.3V to the lower of +6V or (V+ + 0.3V) BST1/VDD1, BST2/VDD2, DRAIN_, ...

Page 3

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ELECTRICAL CHARACTERISTICS (continued 5.5V to 23V, EN_ = VL, SYNC = GND 10kΩ (circuit of Figure 1), T ...

Page 4

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ELECTRICAL CHARACTERISTICS (continued 5.5V to 23V, EN_ = VL, SYNC = GND 10kΩ (circuit of Figure 1), T ...

Page 5

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ELECTRICAL CHARACTERISTICS (continued 5.5V to 23V, EN_ = VL, SYNC = GND 10kΩ (circuit of Figure 1), T ...

Page 6

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ( 5.2V +25°C, unless otherwise noted.) A OUTPUT1 EFFICIENCY (BUCK CONVERTER) vs. LOAD CURRENT 100 ...

Page 7

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ( 5.2V +25°C, unless otherwise noted.) A LINE-TRANSIENT RESPONSE (BUCK CONVERTER) MAX5072 toc10 V IN 5V/div 3.3V/1.5A OUT1 AC-COUPLED 200mV/div V ...

Page 8

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ( 5.2V +25°C, unless otherwise noted.) A EXTERNAL SYNCHRONIZATION 200ns/div V+ SWITCHING SUPPLY CURRENT (I vs. TEMPERATURE 2.2MHz SW 25 ...

Page 9

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ( 5.2V +25°C, unless otherwise noted.) A MANUAL RESET (MR) 100ms/div PIN NAME Clock Output. CLKOUT is 45° phase-shifted with respect to converter 2 ...

Page 10

Dual-Output Buck or Boost Converter with POR and Power-Fail Output PIN NAME Oscillator Frequency Set Input. Connect a resistor from OSC to SGND (R frequency (see the Oscillator section). Set R 11 OSC input frequency when using external synchronization ...

Page 11

Dual-Output Buck or Boost Converter with POR and Power-Fail Output PIN NAME Power Ground. Connect rectifier diode anode, input capacitor negative, output capacitor negative, and 28, 30 PGND VL bypass capacitor returns to PGND. 29 SGND ...

Page 12

Dual-Output Buck or Boost Converter with POR and Power-Fail Output Detailed Description The MAX5072 converter uses a pulse-width modulation (PWM) voltage-mode control scheme for each out-of- phase controller nonsynchronous rectification and uses an external low-forward-drop Schottky diode ...

Page 13

Dual-Output Buck or Boost Converter with POR and Power-Fail Output V+ MAX5072 CONVERTER 1 OSCILLATOR BYPASS FREQUENCY F_SEL1 VREF DIVIDER DIGITAL EN1 SOFT-START V CC SYNC MAIN CKO OSCILLATOR OSC MR PFI OSCILLATOR EN2 Figure 2. Functional Diagram ______________________________________________________________________________________ ...

Page 14

Dual-Output Buck or Boost Converter with POR and Power-Fail Output V IN DRAIN2 OUTPUT2 SOURCE2 DUTY CYCLE = 50% SYNC CLKIN MASTER SYNC CLKOUT (MASTER) CLKOUT (SLAVE) SOURCE1 (MASTER) SYNC PHASE SOURCE2 (MASTER) SOURCE1 (SLAVE) SOURCE2 (SLAVE) C (RIPPLE) ...

Page 15

Dual-Output Buck or Boost Converter with POR and Power-Fail Output Input Voltage (V+)/Internal Linear All internal control circuitry operates from an internally regulated nominal voltage of 5.2V (VL). At higher input voltages (V+) of 5.5V to 23V ...

Page 16

Dual-Output Buck or Boost Converter with POR and Power-Fail Output DRAIN2 DRAIN1 OUTPUT2 SOURCE2 SOURCE1 MAX5072 FB2 FB1 VL EN2 EN1 PGOOD1 SEQUENCING—OUTPUT 2 DELAYED WITH RESPECT TO OUTPUT 1. Figure 4. Power-Supply Sequencing Configurations Dying ...

Page 17

Dual-Output Buck or Boost Converter with POR and Power-Fail Output In deep overload or short-circuit conditions when the FB voltage drops below 0.4V, the switching frequency is reduced to 1 provide sufficient time for the SW ...

Page 18

Dual-Output Buck or Boost Converter with POR and Power-Fail Output For output voltages below 0.8V, set the MAX5072 out- put voltage by connecting a voltage-divider from the output to FB_ to BYPASS (Figure 6). Select R BYPASS resistor) higher ...

Page 19

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ripple of 100mV or less, yielding an ESR and capaci- tance value of 20mΩ and 6.8µF for 1.25MHz frequency. Use a 100µF capacitor at low input voltages to avoid ...

Page 20

Dual-Output Buck or Boost Converter with POR and Power-Fail Output I D ∆ × × f × SW ∆ V ESR ESR = I ∆ L where ( ) V − V × IN ...

Page 21

Dual-Output Buck or Boost Converter with POR and Power-Fail Output V × I × INMAX For the boost converter +(I RMS ...

Page 22

Dual-Output Buck or Boost Converter with POR and Power-Fail Output ZERO ESR , 2 π × ESR π × × OUT OUT Calculate the unity-gain crossover frequency as: f ...

Page 23

Dual-Output Buck or Boost Converter with POR and Power-Fail Output The transconductance error-amplifier gain is × The total loop gain at f should be equal × G ...

Page 24

Dual-Output Buck or Boost Converter with POR and Power-Fail Output f ZERO RHP , f ≤ π × R × C Place a zero ...

Page 25

Dual-Output Buck or Boost Converter with POR and Power-Fail Output Layout Procedure 1) Place the power components first, with ground ter- minals adjacent (inductor, C IN_ all these connections on the top layer with wide, copper-filled areas (2oz copper ...

Page 26

Dual-Output Buck or Boost Converter with POR and Power-Fail Output (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 26 ______________________________________________________________________________________ Package Information ...

Page 27

... 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 ____________________ 27 © 2006 Maxim Integrated Products Package Information (continued registered trademark of Maxim Integrated Products, Inc ...

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