Conclusion

The MAX8538 successfully meets the quality and reliability standards required of all Maxim products. In addition,

Maxim’s continuous reliability monitoring program ensures that all outgoing product will continue to meet Maxim’s quality

and reliability standards.

Table of Contents

I. ........Device Description

V. ........Quality Assurance Information

II. ........Manufacturing Information

VI. .......Reliability Evaluation

III. .......Packaging Information

IV. .......Die Information

.....Attachments

I. Device Description

A. General

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 reference can supply up to 15mA output.

The MAX8538 uses 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

efficiency and cost. The MAX8538 has a 1% accurate reference.

The controller uses a high-side current-sense architecture for current limiting. ILIM pins allow the setting of an

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.

B. Absolute Maximum Ratings

Item

Rating

V+ to GND

-0.3V to +25V

AVL, VL to GND

-0.3V to +6V

PGND to GND

-0.3V to +0.3V

FB_, EN_, POK_ to GND

-0.3V to +6V

REFIN, VTTR, FREQ, SS_, COMP_ to GND

.-0.3V to (AVL + 0.3V)

BST_, ILIM_ to GND

-0.3V to +30V

DH1 to LX1

-0.3V to (BST1 + 0.3V)

DH2 to LX2

-0.3V to (BST2 + 0.3V)

LX_ to BST_

-6V to +0.3V

LX_ to GND

-2V to +25V

DL_ to PGND

-0.3V to (VL + 0.3V)

Operating Temperature Range

-40°C to +85°C

Junction Temperature

+150°C

Storage Temperature Range

-65°C to +150°C

Lead Temperature (soldering, 10s)

+300°C

Continuous Power Dissipation (TA = +70°C)

28-Pin QSOP

860mW

Derates above +70°C

28-Pin QSOP

10.8mW/°C