MAX8539EEI+T datasheet, PDF - EEWORLD Datasheet

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MAX8539EEI+T: Descriptionswitching controllers dual-synchronous buck controller; CategoryPower/power management The power supply circuit; File Size317KB，23 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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MAX8539EEI+T Overview

switching controllers dual-synchronous buck controller

MAX8539EEI+T Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
Maker	Maxim
Parts packaging code	SSOP
package instruction	SSOP, SSOP28,.25
Contacts	28
Reach Compliance Code	compli
ECCN code	EAR99
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER
control mode	VOLTAGE-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	5.5 V
Minimum input voltage	4.5 V
Nominal input voltage	5 V
JESD-30 code	R-PDSO-G28
JESD-609 code	e3
length	9.89 mm
Number of functions	1
Number of terminals	28
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	0.07 A
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Encapsulate equivalent code	SSOP28,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	1.73 mm
surface mount	YES
Switch configuration	PUSH-PULL
Maximum switching frequency	1680 kHz
technology	BICMOS
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	0.635 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3.9 mm

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19-3141; Rev 1; 6/05

KIT

ATION

EVALU

BLE

AVAILA

Dual-Synchronous Buck Controllers for Point-of-

Load, Tracking, and DDR Memory Power Supplies

General Description

The MAX8537/MAX8539 controllers provide a complete

power-management solution for both double-data-rate

(DDR) and combiner supplies. The MAX8537 and

MAX8539 are configured for out-of-phase and in-phase

DDR power-supply operations, respectively, and gener-

ate three outputs: the main memory voltage (V

DDQ

), the

tracking sinking/sourcing termination voltage (V

), and

the termination reference voltage (V

TTR

). The MAX8538

is configured as a dual out-of-phase controller for point-

of-load supplies. Each buck controller can source or

sink up to 25A of current, while the termination refer-

ence can supply up to 15mA output.

The MAX8537/MAX8538/MAX8539 use constant-

frequency voltage-mode architecture with operating

frequencies of 200kHz to 1.4MHz. An internal high-

bandwidth (25MHz) operational amplifier is used as an

error amplifier to regulate the output voltage. This

allows fast transient response, reducing the number of

output capacitors. An all-N-FET design optimizes effi-

ciency and cost. The MAX8537/MAX8538/MAX8539

have a 1% accurate reference. The second synchro-

nous buck controller in the MAX8537/MAX8539 and the

VTTR amplifier generate 1/2 V

DDQ

voltage for V

and

TTR

, and track the V

DDQ

within ±1%.

This family of controllers uses a high-side current-sense

architecture for current limiting. ILIM pins allow the set-

ting of an adjustable, lossless current limit for different

combinations of load current and R

DSON

. Alternately,

more accurate overcurrent limit is achieved by using

a sense resistor in series with the high-side FET.

Overvoltage protection is achieved by latching off the

high-side MOSFET and latching on the low-side MOSFET

when the output voltage exceeds 17% of its set output.

Independent enable, power-good, and soft-start features

enhance flexibility.

Features

♦

MAX8537/MAX8539: Complete DDR Supplies

♦

MAX8538: Dual Nontracking Controller

♦

Out-of-Phase (MAX8537/MAX8538) or In-Phase

(MAX8539) Operation

♦

4.5V to 23V Wide Input Range (Operate Down to

1.8V Input with External 5V Supply)

♦

Tracking Supply Maintains V

= V

TTR

= 1/2 V

DDQ

♦

Adjustable Output from 0.8V to 3.6V with 1%

Accuracy

♦

VTTR Reference Sources and Sinks Up to 15mA

♦

200kHz to 1.4MHz Adjustable Switching

Frequency

♦

All-Ceramic Design Achievable

>90% Efficiency

Independent POK_ and EN_

Adjustable Soft-Start and Soft-Stop for Each

Output

♦

Lossless Adjustable-Hiccup Current Limit

♦

Output Overvoltage Protection

♦

28-Pin QSOP Package

MAX8537/MAX8538/MAX8539

Ordering Information

PART

MAX8537EEI

MAX8537EEI+

MAX8538EEI

MAX8538EEI+

MAX8539EEI

MAX8539EEI+

TEMP RANGE

-40°C to +85°C

PIN-

PACKAGE

28 QSOP

OPERATION

Out-of-phase

tracking

Out-of-phase

tracking

Out-of-phase

nontracking

Out-of-phase

nontracking

In-phase

tracking

In-phase

tracking

Applications

DDR Memory Power Supplies

Notebooks and Desknotes

Servers and Storage Systems

Broadband Routers

XDSL Modems and Routers

Power DSP Core Supplies

Power Combiner in Advanced VGA Cards

Networking Systems

RAMBUS Memory Power Supplies

+Denotes

lead-free package.

Pin Configurations appear 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.

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