MAX15038EVKIT+ Maxim Integrated Products, MAX15038EVKIT+ Datasheet

MAX15038EVKIT+

Manufacturer Part Number

MAX15038EVKIT+

Description

EVALUATION KIT FOR MAX15038

Manufacturer

Maxim Integrated Products

Datasheets

1.MAX15038ETGT.pdf (19 pages)

2.MAX15038EVKIT.pdf (8 pages)

Specifications of MAX15038EVKIT+

Main Purpose

DC/DC, Step Down

Outputs And Type

1, Non-Isolated

Voltage - Output

1.8V

Current - Output

Voltage - Input

2.9 ~ 5.5V

Regulator Topology

Buck

Frequency - Switching

1MHz

Board Type

Fully Populated

Utilized Ic / Part

MAX15038

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Current page: 1 of 19
Download datasheet (450Kb)

The MAX15038 high-efficiency switching regulator

delivers up to 4A load current at output voltages from

0.6V to 90% of V

making it ideal for on-board point-of-load and postregu-

lation applications. Total output error is less than ±1%

over load, line, and temperature ranges.

The MAX15038 features fixed-frequency PWM mode

operation with a switching frequency range of 500kHz

to 2MHz set by an external resistor. The MAX15038

provides the option of operating in a skip mode to

improve light-load efficiency. High-frequency operation

allows for an all-ceramic capacitor design. The high

operating frequency also allows for small-size external

components.

The low-resistance on-chip nMOS switches ensure high

efficiency at heavy loads while minimizing critical induc-

tances, making the layout a much simpler task with

respect to discrete solutions. Following a simple layout

and footprint ensures first-pass success in new designs.

The MAX15038 comes with a high bandwidth (28MHz)

voltage-error amplifier. The voltage-mode control archi-

tecture and the voltage-error amplifier permit a type III

compensation scheme to be utilized to achieve maxi-

mum loop bandwidth, up to 20% of the switching fre-

quency. High loop bandwidth provides fast transient

response, resulting in less required output capacitance

and allowing for all-ceramic-capacitor designs.

The MAX15038 provides two three-state logic inputs to

select one of nine preset output voltages. The preset

output voltages allow customers to achieve ±1% out-

put-voltage accuracy without using expensive 0.1%

resistors. In addition, the output voltage can be set to

any customer value by either using two external resis-

tors at the feedback with a 0.6V internal reference or

applying an external reference voltage to the REFIN

input. The MAX15038 offers programmable soft-start

time using one capacitor to reduce input inrush current.

Pin Configuration appears at end of data sheet.

19-4320; Rev 3; 12/10

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.

Server Power Supplies

POLs

ASIC/CPU/DSP Core and I/O Voltages

DDR Power Supplies

Base-Station Power Supplies

Telecom and Networking Power Supplies

RAID Control Power Supplies

________________________________________________________________ Maxim Integrated Products

. The IC operates from 2.9V to 5.5V,

General Description

Applications

4A, 2MHz Step-Down Regulator

with Integrated Switches

♦ Internal 31mΩ R

♦ Continuous 4A Output Current Over Temperature

♦ ±1% Output Accuracy Over Load, Line, and

♦ Operates from 2.9V to 5.5V V

♦ Adjustable Output from 0.6V to (0.9 x V

♦ Soft-Start Reduces Inrush Supply Current

♦ 500kHz to 2MHz Adjustable Switching Frequency

♦ Compatible with Ceramic, Polymer, and

♦ Nine Preset and Adjustable Output Voltages

♦ Monotonic Startup for Safe-Start into Prebiased

♦ Selectable Forced PWM or Skip Mode for Light

♦ Overcurrent and Overtemperature Protection

♦ Output Current Sink/Source Capable with Cycle-

♦ Open-Drain Power-Good Output

♦ Lead-Free, 4mm x 4mm, 24-Pin Thin QFN Package

+ Denotes a lead(Pb)-free/RoHS-compliant package.

* EP = Exposed pad.

2.9V TO 5.5V

MAX15038ETG+

Temperature

Electrolytic Output Capacitors

Outputs

Load Efficiency

by-Cycle Protection

INPUT

DS(ON)

0.6V, 0.7V, 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.0V,

2.5V, and Adjustable

PART

Low-Side MOSFETs

Typical Operating Circuit

CTL2

CTL1

FREQ

REFIN

MODE

DS(ON)

-40°C to +85°C

TEMP RANGE

MAX15038

Ordering Information

GND

High-Side and 24mΩ

PWRGD

COMP

PGND

OUT

BST

Supply

24 Thin QFN-EP*

PIN-PACKAGE

Features

)

OUTPUT

1.8V, 4A

Related parts for MAX15038EVKIT+

MAX15038EVKIT+ Summary of contents

Page 1

... Base-Station Power Supplies Telecom and Networking Power Supplies RAID Control Power Supplies Pin Configuration appears at end of data sheet. ________________________________________________________________ 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. 4A, 2MHz Step-Down Regulator with Integrated Switches ♦ ...

Page 2

Step-Down Regulator with Integrated Switches ABSOLUTE MAXIMUM RATINGS IN, PWRGD to GND..................................................-0. GND ..................-0.3V to the lower of + COMP, FB, MODE, REFIN, CTL1, CTL2, SS, FREQ to GND ..........................................-0.3V to ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 5V 2.2μ VDD A IN noted.) (Note 3) PARAMETER ERROR AMPLIFIER COMP Clamp Voltage, High V IN COMP Clamp Voltage, Low V IN COMP Slew Rate V ...

Page 4

Step-Down Regulator with Integrated Switches ELECTRICAL CHARACTERISTICS (continued 5V 2.2μ VDD A IN noted.) (Note 3) PARAMETER LX Switching Frequency V IN Switching Frequency Range LX Minimum Off-Time ...

Page 5

ELECTRICAL CHARACTERISTICS (continued 5V 2.2μ VDD A IN noted.) (Note 3) PARAMETER FB Hiccup Threshold V FB Hiccup Threshold Blanking Time V FB Note 3: Specifications are 100% production tested ...

Page 6

Step-Down Regulator with Integrated Switches (Typical values are 5V OUT LOAD TRANSIENT MAX15038 toc06 V OUT AC-COUPLED 100mV/div 2A I OUT 0A 40μs/div SOFT-START WAVEFORM (R = 0.5Ω) LOAD MAX15038 toc09 ...

Page 7

5V OUT HICCUP CURRENT LIMIT MAX15038 toc13 1V/div V OUT 0V 5A/div I OUT 0A I 1A/div IN 0A 400μs/div FEEDBACK VOLTAGE vs. TEMPERATURE 0.64 0.63 0.62 0.61 0.60 0.59 ...

Page 8

Step-Down Regulator with Integrated Switches (Typical values are 5V OUT STARTING INTO PREBIASED OUTPUT (MODE = 2.5V, NO LOAD) DD OUT 200μs/div STARTING INTO PREBIASED OUTPUT ABOVE ...

Page 9

PIN NAME 1 MODE Functional MODE Selection Input. See the MODE Selection section for more information. 3.3V LDO Output. Supply input for the internal analog core. Connect a low-ESR, ceramic capacitor with minimum value of 2.2μF ...

Page 10

Step-Down Regulator with Integrated Switches SHUTDOWN EN CONTROL BIAS GENERATOR VOLTAGE REFERENCE SS SOFT-START REFIN OUT AMPLIFIER 8kΩ FB CTL1 VID VOLTAGE- CONTROL CTL2 CIRCUITRY COMP COMP CLAMPS 10 ______________________________________________________________________________________ V DD 3.3V LDO UVLO CIRCUITRY CURRENT-LIMIT COMPARATOR ...

Page 11

INPUT 2. 22μF 0.1μF C5 2.2μF R4 49.9kΩ Figure 1. 1MHz, All-Ceramic-Capacitor Design with V Detailed Description The MAX15038 high-efficiency, voltage-mode switching regulator delivers output current. The MAX15038 provides output voltages from ...

Page 12

Step-Down Regulator with Integrated Switches Controller Function The controller logic block is the central processor that determines the duty cycle of the high-side MOSFET under different line, load, and temperature conditions. Under normal operation, where the current-limit and ...

Page 13

Power-Good Output (PWRGD) PWRGD is an open-drain output that goes high imped- ance when V is above 0.925 above 0.54V for at least 48 clock cycles. PWRGD pulls low when V is below 90 ...

Page 14

Step-Down Regulator with Integrated Switches where the output ripple due to output capacitance, ESR, and ESL is: I − RIPPLE OUT = ESR − RIPPLE ...

Page 15

Therefore, use type III compensation as shown in Figures 3 and 4. Type III compensation possesses three poles and two zeros with ...

Page 16

Step-Down Regulator with Integrated Switches C x ESR Set the third compensation pole at 1/2 of the switching frequency. Calculate C2 as follows π × × ...

Page 17

FB increases above 92. The additional delay prevents an early transi- REFIN tion from monotonic startup to forced-PWM mode dur- ing soft-start when a prolonged time constant external REFIN voltage is applied. The ...

Page 18

Step-Down Regulator with Integrated Switches Pin Configuration TOP VIEW PGND PGND MAX15038 THIN QFN 18 ______________________________________________________________________________________ ...

Page 19

... 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 ____________________ 19 © 2010 Maxim Integrated Products ...

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