Datasheet

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

General Description

The MAX5933A–MAX5933F/MAX5947A/B/C fully integrat-

ed hot-swap controllers for +9V to +80V positive supply

rails (MAX5947A/B/C), allow for the safe insertion and

removal of circuit cards into live backplanes without caus-

ing glitches on the backplane power-supply rail. The

MAX5947B is pin- and function-compatible with the

LT1641-2. The other devices offer added features such

as a choice of active-high or active-low power-good out-

puts (PWRGD/PWRGD), latched/autoretry fault manage-

ment, and autoretry duty-cycle options of 3.75% or 0.94%

(see the Selector Guide).

The MAX5933A–MAX5933F are available with a default

undervoltage lockout threshold of +31V and operate over

a supply voltage range of +33V to +80V. The

MAX5947A/B/C are available with a default undervoltage

of +8.3V. All devices feature a programmable analog

foldback current limit. If the device remains in current limit

for more than a programmable time, the external

n-channel MOSFET is either latched off (MAX5933A/

MAX5933C/MAX5947A) or is set to automatically restart

after a timeout delay (MAX5933B/MAX5933D/MAX5933E/

MAX5933F/MAX5947B/MAX5947C).

The MAX5933_ and MAX5947_ operate in the extended

temperature range of -40°C to +85°C. These devices are

available in an 8-pin SO package.

Applications

Hot Board Insertion

Electronic Circuit Breakers

Industrial High-Side Switch/Circuit Breakers

Network Routers and Switches

24V/48V Industrial/Alarm Systems

Features

♦ Pin- and Function-Compatible with the LT1641-2

(MAX5947B)

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

Supply Range (MAX5947A/B/C)

♦ Safe Board Insertion and Removal from Live

Backplanes

♦ Latched/Autoretry Management

♦ Active-Low or Active-High Power-Good Output

♦ Programmable Foldback Current Limiting

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

♦ Built-In Thermal Shutdown

♦ Undervoltage Lockout (UVLO)

♦ Overvoltage Protection

♦ User-Programmable Supply Voltage

Power-Up Rate

MAX5933A–MAX5933F/MAX5947A/B/C

Positive High-Voltage, Hot-Swap Controllers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3263; 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 and Pin Configuration appear at

end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX5933_ESA* -40°C to +85°C 8 SO

MAX5947_ESA* -40°C to +85°C 8 SO

*Insert the desired suffix from the Selector Guide into the blank

to complete the part number.

PART

LATCHED

FAULT

PROTECTION

AUTORETRY

FAULT

PROTECTION

PWRGD

OUTPUT LOGIC

DUTY CYCLE

(%)

DEFAULT UVLO

(V)

SUPPLY

VOLTAGE

RANGE (V)

MAX5933A Yes — High — 31 33 to 80

MAX5933B — Yes High 3.75 31 33 to 80

MAX5933C Yes — Low — 31 33 to 80

MAX5933D — Yes Low 3.75 31 33 to 80

MAX5933E — Yes High 0.94 31 33 to 80

MAX5933F — Yes Low 0.94 31 33 to 80

MAX5947A Yes — Low — 8.3 9 to 80

MAX5947B — Yes High 3.75 8.3 9 to 80

MAX5947C — Yes Low 3.75 8.3 9 to 80

Selector Guide

Summary of content (15 pages)

PAGE 1
9-3263; Rev 1; 7/04 Positive High-Voltage, Hot-Swap Controllers Features The MAX5933A–MAX5933F/MAX5947A/B/C fully integrated hot-swap controllers for +9V to +80V positive supply rails (MAX5947A/B/C), allow for the safe insertion and removal of circuit cards into live backplanes without causing glitches on the backplane power-supply rail. The MAX5947B is pin- and function-compatible with the LT1641-2.
PAGE 2
MAX5933A–MAX5933F/MAX5947A/B/C Positive High-Voltage, Hot-Swap Controllers ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to GND) VCC .........................................................................-0.3V to +85V SENSE, FB, ON ..........................................-0.3V to (VCC + 0.3V) TIMER, PWRGD, PWRGD.......................................-0.3V to +85V GATE ......................................................................-0.3V to +95V Maximum GATE Current ...............................
PAGE 3
Positive High-Voltage, Hot-Swap Controllers (VCC = +24V (MAX5947A/B/C), VCC = +48V (MAX5933A–MAX5933F), GND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER ON Hysteresis SYMBOL CONDITIONS MIN VONHYST ON Input Bias Current IINON TYP MAX UNITS 80 +1 µA PWRGD Leakage Current IOH VPWRGD = 80V 10 µA PWRGD Leakage Current IOL VPWRGD = 80V 10 µA IO = 2mA 0.4 IO = 4mA 2.
PAGE 4
MAX5933A–MAX5933F/MAX5947A/B/C Positive High-Voltage, Hot-Swap Controllers Test Circuit and Timing Diagrams ON VCC 24V FB SENSE 1.313V 1.233V FB MAX5933_ MAX5947_ tPLHFB tPHLFB V+ = 5V PWRGD PWRGD GATE 5kΩ 1V 1V 10nF GND TIMER Figure 3. FB to PWRGD Timing Figure 1. Test Circuit 1.313V 1.233V VCC - SENSE ON tPLHON 47mV tPHLON tPHLSENSE GATE GATE 5V Figure 2. ON to GATE Timing 4 1V VCC Figure 4.
PAGE 5
Positive High-Voltage, Hot-Swap Controllers 1.245 2.0 TA = +85°C ICC (mA) TA = +25°C 1.5 1.2 0.9 2.5 FB LOW-VOLTAGE THRESHOLD (V) 2.1 1.250 MAX5933 toc02 2.4 VCC = 48V (MAX5933_/MAX5947_) 1.5 1.0 TA = -40°C 0.6 VCC = 24V (MAX5947_) 0.5 0.3 1.235 1.230 1.225 1.220 1.215 1.210 1.205 0 0 40 48 56 64 72 1.200 -40 80 -15 10 35 85 60 -40 10 35 60 TEMPERATURE (°C) TEMPERATURE (°C) FB HIGH-VOLTAGE THRESHOLD vs. TEMPERATURE FB HYSTERESIS vs.
PAGE 6
Typical Operating Characteristics (continued) (VCC = +48V, TA = +25°C, unless otherwise noted.) -75 -80 -85 -75 -76 TA = 0°C -77 TA = -40°C -75 -76 -15 10 35 -79 30 40 50 60 70 VCC (V) ON HIGH-VOLTAGE THRESHOLD vs. TEMPERATURE ON LOW-VOLTAGE THRESHOLD vs. TEMPERATURE 1.303 1.293 1.283 1.255 1.245 1.235 1.
PAGE 7
Positive High-Voltage, Hot-Swap Controllers 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 for the latched-off version (MAX5933A/MAX5933C/MAX5947A, 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).
PAGE 8
Positive High-Voltage, Hot-Swap Controllers MAX5933A–MAX5933F/MAX5947A/B/C Functional Diagram FB VCC SENSE MAX5933_ MAX5947_ VP GEN CHARGE PUMP AND GATE DRIVER REF GEN 0.5V PWRGD (PWRGD) OPEN DRAIN GATE 12mV TO 47mV 1.233V ON VCC UNDERVOLTAGE LOCKOUT VUVLO LOGIC VP 0.5V 80µA 1.233V TIMER 3µA *0.75µA ( ) FOR THE MAX5933C/D/F AND THE MAX5947A/C. *FOR THE MAX5933E/MAX5933F.
PAGE 9
Positive High-Voltage, Hot-Swap Controllers The MAX5933_ and MAX5947_ monitor the input voltage, the output voltage, the output current, and the die temperature. These devices feature power-good outputs (PWRGD/PWRGD) to indicate the status of the output voltage by monitoring the voltage at FB (see the PowerGood Detection section). The MAX5933_ and MAX5947_ are fully integrated hotswap controllers for positive supply rails.
PAGE 10
MAX5933A–MAX5933F/MAX5947A/B/C Positive High-Voltage, Hot-Swap Controllers 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 Controllers SHORT-CIRCUIT WAVEFORMS OUTPUT 50V/div PROPAGATION DELAY (µs) 12 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. When the current-limit circuitry is not active, TIMER is pulled to GND by a 3µA current source.
PAGE 12
MAX5933A–MAX5933F/MAX5947A/B/C Positive High-Voltage, Hot-Swap Controllers RSENSE 0.025Ω Q1 IRF530 VIN CL SHORT PIN R1 49.9kΩ 1% D1 30V 1N5256B D2 CMPZ5248B R5 10Ω 5% R6 1kΩ 5% 0.1µF 8 VCC 1 7 SENSE C1 10nF GATE 2 R4 3.57kΩ 1% MAX5933B MAX5947B 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.
PAGE 13
Positive High-Voltage, Hot-Swap Controllers Q1 IRF530 VIN SHORT PIN R1 294kΩ 1% 0.1µF 8 7 SENSE VCC 1 D1 CMPZ5248B R5 10Ω 5% R6 1kΩ 5% C1 10nF GATE 5 TIMER VIN+ VOUT+ VOUT ON/OFF VIN- VOUT- R4 4.22kΩ 1% PWRGD C2 0.68µF CL 220µF 2 MAX5933A R2 10.2kΩ 1% R7 47kΩ 5% 6 FB ON R3 143kΩ 1% 3 GND 4 GND Figure 12. Active-Low Enable Module Layout Considerations GATE DRIVE vs.
PAGE 14
MAX5933A–MAX5933F/MAX5947A/B/C Positive High-Voltage, Hot-Swap Controllers Chip Information TRANSISTOR COUNT: 1573 PROCESS: BiCMOS Pin Configuration MAX5933_ MAX5947_ TOP VIEW IRF530 ON 1 FB 2 PWRGD (PWRGD) 3 MAX5933_ MAX5947_ GND 4 8 VCC 7 SENSE 6 GATE 5 TIMER SO ( ) ONLY FOR THE MAX5933C/D/F/MAX5947A/MAX5947C. 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.
PAGE 15
Positive High-Voltage, Hot-Swap Controllers 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.