Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - hot swap controller Multi-purpose QSOP 16 Surface-mount

General Description

The MAX5934/MAX5934A are fully integrated hot-swap

controllers for +9V to +80V (MAX5934A) positive supply

rails. The MAX5934 is optimized for +33V to +80V

power-supply rails. These devices allow for the safe

insertion and removal of circuit cards into a live back-

plane without causing glitches on the backplane

power-supply rail. The MAX5934/MAX5934A feature a

programmable analog foldback current limit, program-

mable undervoltage lockout, and programmable out-

put-voltage slew rate through an external n-channel

MOSFET. In addition, if these devices remain in current

limit for more than a programmable time, the external

n-channel MOSFET latches off.

The MAX5934/MAX5934A feature pin-selectable

PWRGD_ assertion polarity (active low or active high)

and pin-selectable fault management (latched or

autoretry). Other features include automatic restart after

a circuit-breaker fault, selectable duty-cycle (DC)

options, and thermal-shutdown mode for overtempera-

ture protection.

The MAX5934/MAX5934A operate in the extended

(-40°C to +85°C) temperature range and are available

in a 16-pin QSOP package.

Applications

Hot Board Insertion

Electronic Circuit Breakers

Industrial High-Side Switch/Circuit Breakers

Network Routers and Switches

24V/48V Industrial/Alarm Systems

Features

♦ Provides Safe Hot Swap for +9V to +80V Power

Supplies (MAX5934A)

♦ Safe Board Insertion and Removal from a Live

Backplane

♦ Pin-Selectable Active-Low or Active-High Power-

Good Output

♦ Pin-Selectable Latched or Autoretry Fault

Management

♦ Programmable Foldback Current Limiting

♦ High-Side Drive for an External N-Channel MOSFET

♦ Built-In Thermal Shutdown

♦ Undervoltage Lockout (UVLO)

♦ Pin-Selectable Duty-Cycle Options (0.94%, 1.88%,

3.75%)

MAX5934/MAX5934A

Positive High-Voltage, Hot-Swap Controllers with

Selectable Fault Management and Status Polarity

________________________________________________________________ Maxim Integrated Products 1

LATCH/RETRY

SENSE

N.C.

FB2

GATE

TIMER

OUT

TOP VIEW

MAX5934

MAX5934A

QSOP

POL_SEL

PWRGD1

FB1

PWRGD2

PWRGD3

GND

Pin Configuration

Ordering Information

PART

DEFAULT UVLO

(V)

SUPPLY VOLTAGE

RANGE (V)

LATCHED/

AUTORETRY FAULT

PROTECTION

DUTY CYCLE

PWRGD_

OUTPUT LOGIC

MAX5934 31 +33 to +80 Pin-selectable Pin-selectable Pin-selectable

MAX5934A 8.3 +9 to +80 Pin-selectable Pin-selectable Pin-selectable

Selector Guide

19-3282; Rev 1; 7/04

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.

Typical Application Circuit appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX5934EEE -40°C to +85°C 16 QSOP

MAX5934AEEE -40°C to +85°C 16 QSOP

Summary of content (15 pages)

PAGE 1
9-3282; Rev 1; 7/04 Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity The MAX5934/MAX5934A are fully integrated hot-swap controllers for +9V to +80V (MAX5934A) positive supply rails. The MAX5934 is optimized for +33V to +80V power-supply rails. These devices allow for the safe insertion and removal of circuit cards into a live backplane without causing glitches on the backplane power-supply rail.
PAGE 2
MAX5934/MAX5934A Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) VCC .........................................................................-0.3V to +85V SENSE, FB_, ON.........................................-0.3V to (VCC + 0.3V) TIMER, PWRGD_, DC, LATCH/RETRY, POL_SEL ....-0.3V to +85V GATE ......................................................................-0.3V to +95V OUT .......................
PAGE 3
Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity (VCC = +24V (MAX5934A), VCC = +48V (MAX5934), GND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER TIMER Pulldown Current SYMBOL ITIMERON CONDITIONS VTIMER = 1V MIN TYP MAX DC = 3.75%, DC = floating 1.5 3 4.5 DC = 1.88%, DC = high 0.75 1.5 2.25 DC = 0.94%, DC = low UNITS µA 0.37 0.75 1.
PAGE 4
MAX5934/MAX5934A Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity ELECTRICAL CHARACTERISTICS (continued) (VCC = +24V (MAX5934A), VCC = +48V (MAX5934), GND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS FB_ Low-to-PWRGD_ Low Propagation Delay tPHLFB_ Figures 1, 3 3.2 µs FB_ High-to-PWRGD_ High Propagation Delay tPLHFB_ Figures 1, 3 1.
PAGE 5
Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity SUPPLY CURRENT vs. SUPPLY VOLTAGE TA = +25°C 2.0 ICC (mA) TA = +85°C 1.5 1.2 0.9 VCC = 48V 1.5 1.0 TA = -40°C VCC = 33V 0.6 0.5 1.245 1.240 1.235 1.230 1.225 1.220 1.215 1.210 1.205 0.3 1.200 0 0 40 48 56 64 -40 80 72 -15 10 35 -40 85 60 10 35 60 TEMPERATURE (°C) TEMPERATURE (°C) FB_ HIGH-VOLTAGE THRESHOLD vs. TEMPERATURE FB_ HYSTERESIS vs. TEMPERATURE IGATE PULLUP CURRENT vs.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +48V, TA = +25°C, unless otherwise noted.) TIMER PULLUP CURRENT vs. TEMPERATURE ON HIGH-VOLTAGE THRESHOLD vs. TEMPERATURE TIMER PULLUP CURRENT vs. SUPPLY VOLTAGE -70 -75 -80 -85 TA = +25°C TA = +85°C -75 -76 TA = -40°C -77 -78 -90 -15 10 35 85 60 1.333 1.323 1.313 1.303 1.293 1.283 -79 -40 33 TEMPERATURE (°C) 40 48 56 64 -40 80 72 -15 60 1.245 1.235 1.225 MAX5934 toc13 0.080 0.078 ON HYSTERESIS (V) 1.
PAGE 7
Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity PIN NAME FUNCTION 1 LATCH/ RETRY 2 ON On/Off Control Input. ON implements the undervoltage-lockout threshold and resets the part after a fault latch (see the Fault Management (LATCH/RETRY) section). 3 POL_SEL PWRGD_ Polarity Select Input. Leave POL_SEL open or drive to logic-high voltage for PWRGD_ asserted high. Connect POL_SEL to GND for PWRGD_ asserted low. 4 FB1 Power-Good Comparator Input.
PAGE 8
Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity MAX5934/MAX5934A Functional Diagram FB1 SENSE VCC MAX5934 MAX5934A PWRGD3 4.3V OPEN DRAIN VP VP GEN CHARGE PUMP AND GATE DRIVER REF GEN PWRGD1 GATE GATE OUT OPEN DRAIN FB2 PWRGD2 1.233V OPEN DRAIN ON PWRGD_ POLARITY SELECT VCC VUVLO LOGIC CIRCUITBREAKER FAULTMANAGEMENT SELECT VP 0.5V 75µA DUTY CYCLE 1.
PAGE 9
Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity The MAX5934/MAX5934A monitor input voltage, output voltage, output current, and die temperature. These devices feature three power-good outputs (PWRGD_) to indicate status by monitoring the voltage at FB1, FB2, and GATE (see the Power-Good (PWRGD_) Detection section).
PAGE 10
MAX5934/MAX5934A Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity ILOAD = 1) TIMER’s voltage goes below 0.5V VSENSETRIP RSENSE where: VSENSETRIP = VIN - VSENSE VSENSETRIP varies from a low of 12mV when the voltage at FB1 = 0V and increases to 47mV as the voltage at FB1 increases to 0.5V and beyond (see Figure 6). Thus, the current limit is low at a low output voltage, and increases as the output voltage reaches its final value.
PAGE 11
Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity Power-Good (PWRGD_ ) Detection The MAX5934/MAX5934A feature three power-good outputs (PWRGD_) to indicate the status of three separate voltages. PWRGD_ asserts if the device detects an error condition. PWRGD_ is true when FB_ voltages exceed the low-tohigh threshold voltage (VFB_H). PWRGD_ is false when FB_ voltages go lower than the high-to-low threshold voltage (VFB_L).
PAGE 12
Undervoltage and Overvoltage Detection RESPONSE TIME TO OVERCURRENT An undervoltage fault is detected when V ON goes below the trip point (VONL = 1.233V). When this occurs, GATE pulls low and stays low until VON rises above (VONH = 1.313V). An example of overvoltage protection is shown in Figure 8. Zener diode D1 turns on when VIN exceeds the diode’s breakdown voltage and begins to pull TIMER high. When VTIMER goes higher than 1.233V, a fault is detected and GATE pulls low. As a result, Q1 turns off.
PAGE 13
Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity MAX5934/MAX5934A OVERVOLTAGE WAVEFORMS IN 50V/div ISENSE 5A/div GATE 50V/div IRF530 TIMER 10V/div OUTPUT 50V/div 10µs/div Figure 9. Overvoltage Waveforms Figure 10. Recommended Layout for R2, R3, and RSENSE changes in currents flowing through the power-supply traces. This can cause inductive voltage spikes that could exceed 85V. Use wider traces or heavier trace plating and connect a 0.
PAGE 14
Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity MAX5934/MAX5934A Typical Application Circuit VIN M1 RSENSE 0.025Ω IRF530 R1 1kΩ 5% RG 10Ω 5% C1 10nF R2 49.9kΩ 1% 16 VCC 2 14 SENSE ON 11 GATE OUT 9 R4 59kΩ 1% R3 3.4kΩ 1% SMBJ54A 10 FB1 TIMER LATCH/RETRY R8 24kΩ 5% CL R5 3.57kΩ 1% MAX5934 MAX5934A 1 R7 24kΩ 5% 4 CTIMER 0.
PAGE 15
Positive High-Voltage, Hot-Swap Controllers with Selectable Fault Management and Status Polarity QSOP.EPS PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH 21-0055 E 1 1 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.