Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - hot swap controller Multi-purpose SOIC 8 Surface-mount

General Description

The MAX5932 is a fully integrated hot-swap controller for

+9V to +80V positive supply rails. The MAX5932 allows

for the safe insertion and removal of circuit cards into a

live backplane without causing glitches on the back-

plane power-supply rail. This device is pin and function

compatible to LT1641-1. The MAX5932 features a pro-

grammable foldback-current limit. If the device remains

in current limit for more than a programmable time, the

external n-channel MOSFET latches off. Other features

include a programmable undervoltage lockout and a

programmable output-voltage slew rate through an

external n-channel MOSFET.

The MAX5932 provides a power-good output (PWRGD)

to indicate the status of the output voltage. For a variety

of PWRGD/PWRGD, latch/autoretry-fault management,

autoretry duty-cycle options, refer to the MAX5933 and

MAX5934 data sheets.

The MAX5932 operates in the -40°C to +85°C extended

temperature range. This device is available in an

8-pin SO package.

Applications

Hot Board Insertion

Electronic Circuit Breaker

Industrial High-Side Switch/Circuit Breaker

Network Routers and Switches

24V/48V Industrial/Alarm Systems

Features

♦ Pin and Function Compatible with LT1641-1

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

Supplies

♦ Safe Board Insertion and Removal from Live

Backplanes

♦ Active-High Power-Good Output (PWRGD)

♦ Programmable Foldback-Current Limiting

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

♦ Undervoltage Lockout (UVLO)

♦ Overvoltage Protection

♦ Latched Fault Management

♦ User-Programmable Supply Voltage

Power-Up Rate

MAX5932

Positive High-Voltage, Hot-Swap Controller

________________________________________________________________ Maxim Integrated Products 1

GATE

TIMERGND

SENSEFB

PWRGD

TOP VIEW

MAX5932

Pin Configuration

Ordering Information

19-3264; Rev 0; 4/04

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX5932ESA -40°C to +85°C 8 SO

Summary of content (15 pages)

PAGE 1
9-3264; Rev 0; 4/04 KIT ATION EVALU LE B A IL A AV Positive High-Voltage, Hot-Swap Controller The MAX5932 is a fully integrated hot-swap controller for +9V to +80V positive supply rails. The MAX5932 allows for the safe insertion and removal of circuit cards into a live backplane without causing glitches on the backplane power-supply rail. This device is pin and function compatible to LT1641-1. The MAX5932 features a programmable foldback-current limit.
PAGE 2
MAX5932 Positive High-Voltage, Hot-Swap Controller ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND) VCC .........................................................................-0.3V to +85V SENSE, FB, ON ..........................................-0.3V to (VCC + 0.3V) TIMER, PWRGD......................................................-0.3V to +85V GATE ......................................................................-0.3V to +95V Maximum GATE Current ....................................
PAGE 3
Positive High-Voltage, Hot-Swap Controller (VCC = +24V, 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 ON Low-to-GATE Low Propagation Delay tPHLON CGATE = 0, Figures 1, 2 6 µs ON High-to-GATE High Propagation Delay tPLHON CGATE = 0, Figures 1, 2 1.7 µs 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 4
Positive High-Voltage, Hot-Swap Controller MAX5932 Test Circuit and Timing Diagrams ON VCC 24V MAX5932 FB SENSE 1.313V 1.233V ON tPLHON 5V PWRGD GATE 5kΩ GND Figure 2. ON to GATE Timing 1.313V 1.233V VCC - SENSE tPHLFB GATE FB tPLHFB 1V Figure 3. FB to PWRGD Timing 4 1V TIMER Figure 1. Test Circuit PWRGD 5V GATE 10nF tPHLON 1V 47mV tPHLSENSE VCC Figure 4.
PAGE 5
Positive High-Voltage, Hot-Swap Controller ICC (mA) 1.5 1.245 2.0 TA = +85°C TA = +25°C 2.5 FB LOW-VOLTAGE THRESHOLD (V) 2.1 1.250 MAX5932 toc02 2.4 1.2 VCC = 48V 1.5 0.9 1.0 TA = -40°C 0.6 VCC = 24V 0.5 0.3 1.235 1.230 1.225 1.220 1.215 1.210 1.205 0 0 8 16 24 32 40 48 56 64 72 80 1.200 -40 -15 10 35 85 60 -40 10 35 60 TEMPERATURE (°C) TEMPERATURE (°C) FB HIGH-VOLTAGE THRESHOLD vs. TEMPERATURE FB HYSTERESIS vs. TEMPERATURE IGATE PULLUP CURRENT vs. TEMPERATURE 0.
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. VCC -70 -75 -80 TA = +85°C TA = +25°C -75 -76 TA = 0°C -77 TA = -40°C -78 -85 -79 -90 -40 -15 10 35 1.323 1.313 1.303 1.293 10 20 30 40 50 60 80 70 -40 1.245 1.235 1.225 MAX5932 toc13 0.081 0.079 0.077 0.075 1.215 1.205 0.
PAGE 7
Positive High-Voltage, Hot-Swap Controller PIN NAME FUNCTION 1 ON On/Off Control Input. ON is used to implement the undervoltage lockout threshold and resets the part after a fault condition (see the Detailed Description section). 2 FB Power-Good Comparator Input. Connect a resistive divider from output to FB to GND to monitor the output voltage (see the Power-Good Detection section). FB is also used as a feedback for the current-limit foldback function. 3 PWRGD Open-Drain Power-Good Output.
PAGE 8
Positive High-Voltage, Hot-Swap Controller MAX5932 Functional Diagram FB VCC SENSE MAX5932 VP GEN CHARGE PUMP AND GATE DRIVER REF GEN 0.5V PWRGD GATE OPEN DRAIN 1.233V ON VCC UNDERVOLTAGE LOCKOUT 8.3V LOGIC VP 0.5V 80µA 1.
PAGE 9
Positive High-Voltage, Hot-Swap Controller The MAX5932 monitors the input voltage, the output voltage, the output current, and the die temperature. This device features a power-good output (PWRGD) to indicate the status of the output voltage by monitoring the voltage at FB (see the Power-Good Detection section). As shown in Figure 5, a sense resistor is connected between VCC and SENSE to sense the load current.
PAGE 10
MAX5932 Positive High-Voltage, Hot-Swap Controller Applications Information Hot-Circuit Insertion When circuit boards are inserted into a live backplane, the supply bypass capacitors on the boards draw high peak currents from the backplane power bus as they charge up. The transient currents can permanently damage the connector pins and glitch the system supply, causing other boards in the system to reset.
PAGE 11
Positive High-Voltage, Hot-Swap Controller SHORT-CIRCUIT WAVEFORMS OUTPUT 50V/div 12 PROPAGATION DELAY (µs) MAX5932 RESPONSE TIME TO OVERCURRENT 14 10 ISENSE 1A/div 8 GATE 50V/div 6 4 TIMER 1V/div 2 0 0 100 200 300 10ms/div VCC - VSENSE (mV) Figure 8. Response Time to Overcurrent Figure 9. Short-Circuit Waveforms TIMER TIMER provides a method for programming the maximum time the device is allowed to operate in current limit.
PAGE 12
MAX5932 Positive High-Voltage, Hot-Swap Controller RSENSE 0.025Ω Q1 IRF530 VIN CL SHORT PIN R1 49.9kΩ 1% D1 30V 1N5256B R5 10Ω 5% 0.1µF 8 VCC 1 D2 CMPZ5248B 7 SENSE R6 1kΩ 5% C1 10nF GATE 2 R4 3.57kΩ 1% MAX5932 R2 3.4kΩ 1% 5 TIMER C2 0.68µF R7 24kΩ 5% 6 FB ON R3 59kΩ 1% PWRGD 3 PWRGD GND 4 GND Figure 10. Overvoltage Detection GATE Voltage OVERVOLTAGE WAVEFORMS IN 50V/div ISENSE 5A/div GATE 50V/div A curve of Gate Drive vs. VCC is shown in Figure 13.
PAGE 13
Positive High-Voltage, Hot-Swap Controller Q1 IRF530 VIN SHORT PIN R1 294kΩ 1% 0.1µF 8 1 D1 CMPZ5248B R5 10Ω 5% 7 SENSE VCC R6 1kΩ 5% 5 TIMER CL 220µF VIN+ VOUT+ VOUT ON/OFF VIN- VOUT- 2 R4 4.22kΩ 1% PWRGD C2 0.68µF R7 47kΩ 5% C1 10nF GATE FB ON R3 143kΩ 1% 6 MAX5932 R2 10.2kΩ 1% MAX5932 RSENSE 0.01Ω 3 GND 4 GND Figure 12. Active-Low Enable Module Layout Considerations GATE DRIVE vs.
PAGE 14
Positive High-Voltage, Hot-Swap Controller MAX5932 Chip Information TRANSISTOR COUNT: 1573 PROCESS: BiCMOS IRF530 Figure 14. Recommended Layout for R1, R2, and RSENSE Typical Application Circuit RSENSE 0.01Ω Q1 IRF530 VIN CL *SMBJ51A R1 49.9kΩ 1% R5 10Ω 5% 0.1µF 8 VCC 1 7 SENSE R6 1kΩ 5% TIMER R7 24kΩ 5% C1 10nF GATE 2 R4 3.57kΩ 1% MAX5932 5 R3 59kΩ 1% 6 FB ON R2 3.4kΩ 1% C2 0.68µF D1 CMPZ5248B PWRGD 3 GND 4 GND *DIODES, INC.
PAGE 15
Positive High-Voltage, Hot-Swap Controller N E H INCHES MILLIMETERS MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .EPS DIM A A1 B C e E H L 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.