________________________________________________________________ Maxim Integrated Products

1

19-3281; Rev 1; 1/05

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.

General Description

The MAX5936/MAX5937 are hot-swap controllers for

-10V to -80V rails. The MAX5936/MAX5937 allow circuit

line cards to be safely hot-plugged into a live back-

plane without causing a glitch on the power supply.

These devices integrate a circuit-breaker function

The MAX5936/MAX5937 provide a controlled turn-on

for circuit cards, limiting inrush, preventing glitches on

the power-supply rail, and preventing damage to board

connectors and components. Before startup, the

devices perform a Load Probe™ test to detect the

presence of a short-circuit condition. If a short-circuit

condition does not exist, the device limits the inrush

current drawn by the load by gradually turning on the

external MOSFET. Once the external MOSFET is fully

enhanced, the MAX5936/MAX5937 provides overcur-

rent and short-circuit protection by monitoring the volt-

MOSFET. The MAX5936/MAX5937 integrate a 400mA

fast GATE pulldown to guarantee that the power

MOSFET is rapidly turned off in the event of an overcur-

rent or short-circuit condition.

The MAX5936/MAX5937 protect the system against

ty. The MAX5936/MAX5937 provide an accurate UVLO

voltage. The MAX5936 has an open-drain, active-low

PGOOD output and the MAX5937 has an open-drain,

active-high PGOOD output.

The MAX5936/MAX5937 are offered with 100mV,

200mV, and 400mV circuit-breaker thresholds, in addi-

tion to a non-circuit-breaker option. These devices are

offered in latched and autoretry fault management, are

available in 8-pin SO packages, and specified for the

extended (-40°C to +85°C) temperature range (see the

Selector Guide).

Applications

Servers

Telecom Line Cards

Network Switches

Solid-State Circuit Breaker

Network Routers

Features

o -10V to -80V Operation

o Drives Large Power MOSFETS

o Programmable Inrush Current Limit During Hot

Plug

o 100mV, 200mV, 400mV, and No-Circuit-Breaker

Threshold Options

o Circuit-Breaker Fault with Transient Rejection

o Shorted Load Detection (Load Probe) Before

Power MOSFET Turn-On

o ±2.4% Accurate Undervoltage Lockout (UVLO)

o Autoretry and Latched Fault Management

Available

o Low Quiescent Current

GATE

LP

1

2

8

7

PGOOD

(PGOOD)

UVLO

STEP_MON

GND

SO

TOP VIEW

3

4

6

5

MAX5936

MAX5937

( ) FOR THE MAX5937.

Pin Configuration

Load Probe is a trademark of Maxim Integrated Products, Inc.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX5936_ _ESA

-40°C to +85°C

8 SO

MAX5937_ _ESA

-40°C to +85°C

8 SO

Note: The first “_” represents A for the autoretry and L for the

latched fault management option.

The second “_” represents the circuit-breaker threshold.

See the Selector Guide for additional information.

Selector Guide and Typical Operating Circuit appear at end

of data sheet.