MAX5920AESA+T Maxim Integrated Products, MAX5920AESA+T Datasheet

IC HOT-SWAP CTRLR -48V 8-SOIC

MAX5920AESA+T

Manufacturer Part Number
MAX5920AESA+T
Description
IC HOT-SWAP CTRLR -48V 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Hot-Swap Controllerr
Datasheet

Specifications of MAX5920AESA+T

Applications
General Purpose
Internal Switch(s)
No
Voltage - Supply
-20 V ~ -80 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX5920A/MAX5920B are hot-swap controllers that
allow a circuit card to be safely hot plugged into a live
backplane. The MAX5920A/MAX5920B operate from
-20V to -80V and are well-suited for -48V power systems.
These devices are pin and function compatible with the
LT4250 and pin compatible with the LT1640.
The MAX5920A/MAX5920B provide a controlled turn-on
to circuit cards preventing glitches on the power-supply
rail and damage to board connectors and components.
The MAX5920A/MAX5920B provide undervoltage, over-
voltage, and overcurrent protection. These devices
ensure the input voltage is stable and within tolerance
before applying power to the load.
Both the MAX5920A and MAX5920B protect a system
against overcurrent and short-circuit conditions by turn-
ing off the external MOSFET in the event of a fault con-
dition. The MAX5920A/MAX5920B also provide
protection against input voltage steps. During an input
voltage step, the MAX5920A/MAX5920B limit the cur-
rent drawn by the load to a safe level without turning off
power to the load.
Both devices feature an open-drain power-good status
output (PWRGD for the MAX5920A or PWRGD for the
MAX5920B) that can be used to enable downstream
converters. A built-in thermal-shutdown feature is also
included to protect the external MOSFET in case of
overheating.
The MAX5920A/MAX5920B are available in an 8-pin SO
package. Both devices are specified for the extended
-40°C to +85°C temperature range.
19-2931; Rev 0; 8/03
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
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.
Telecom Line Cards
Network Switches/Routers
Central-Office Line Cards
Server Line Cards
Base-Station Line Cards
________________________________________________________________ Maxim Integrated Products
General Description
Applications
-48V Hot-Swap Controller
o Allows Safe Board Insertion and Removal
o Pin- and Function-Compatible with LT4250L
o Pin-Compatible with LT1640L (MAX5920A)
o Pin- and Function-Compatible with LT4250H
o Pin-Compatible with LT1640H (MAX5920B)
o Circuit-Breaker Immunity to Input Voltage Steps
o Withstands -100V Input Transients with No
o Programmable Inrush and Short-Circuit Current
o Operates from -20V to -80V
o Programmable Overvoltage Protection
o Programmable Undervoltage Lockout
o Powers Up into a Shorted Load
o Power-Good Control Output
o Thermal Shutdown Protects External MOSFET
MAX5920AESA
MAX5920BESA
from a Live -48V Backplane
(MAX5920A)
(MAX5920B)
and Current Spikes
External Components
Limits
with External R
TOP VIEW
PART
(PWRGD)
( ) FOR MAX5920B.
PWRGD
V
OV
UV
EE
1
2
4
3
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
MAX5920A
MAX5920B
SO
Pin Configuration
6
8
7
5
V
DRAIN
GATE
SENSE
DD
PIN-PACKAGE
8 SO
8 SO
SENSE
Features
1

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MAX5920AESA+T Summary of contents

Page 1

... Server Line Cards Base-Station Line Cards Typical Operating Circuit and Selector Guide appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. -48V Hot-Swap Controller with External R ...

Page 2

Hot-Swap Controller with External R ABSOLUTE MAXIMUM RATINGS All Voltages are Referenced Unless Otherwise Noted. Supply Voltage ( .................................-0.3V to +100V DD EE DRAIN, PWRGD, PWRGD ....................................-0.3V to +100V PWRGD to DRAIN ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 0V 48V -40°C to +85°C. Typical values are PARAMETER SYMBOL D RAIN Thr eshol d for ood GATE High Threshold PWRGD, ...

Page 4

Hot-Swap Controller with External 48V 0V +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE 900 T = +85° +25° 800 700 600 500 T ...

Page 5

Figure 1a. Test Circuit Figure 1b. Test Circuit 2 _______________________________________________________________________________________ -48V Hot-Swap Controller with External R R 5kΩ PWRGD/PWRGD DRAIN V OV MAX5920A MAX5920B UV GATE V SENSE EE PWRGD/PWRGD ...

Page 6

Hot-Swap Controller with External R 2V 1.255V PHLOV GATE 1V Figure GATE Timing 100mV 60mV SENSE PHLSENSE GATE 1V Figure 4a. SENSE to GATE Timing 6 _______________________________________________________________________________________ SENSE 2V 1.205V ...

Page 7

DRAIN 1.4V t PHLDL PWRGD DRAIN 1.4V PWRGD PWRGD DRAIN Figure 5a. DRAIN to PWRGD /PWRGD Timing UV REF _______________________________________________________________________________________ -48V Hot-Swap Controller with External R ∆V GATE ...

Page 8

Hot-Swap Controller with External R PIN NAME MAX5920A MAX5920B PWRGD 1 — — 1 PWRGD SENSE 6 6 GATE 7 7 DRAIN Detailed ...

Page 9

Figure 6a shows a typical hot-swap circuit for -48V sys- tems. When the circuit board first makes contact with the backplane, the DRAIN to GATE capacitance ( pulls up the GATE voltage to roughly ...

Page 10

Hot-Swap Controller with External R CONTACT BOUNCE 4ms/div Figure 6b. Input Inrush Current If the voltage between V and SENSE reaches the cur- EE rent-limit trip voltage (V ), the MAX5920_ pulls down CL the GATE pin and regulates ...

Page 11

Figure 7b. Short-Circuit Protection Waveform -48V RTN (SHORT PIN) -48V RTN 549kΩ 6.49kΩ * 10kΩ -48V *DIODES INC. SMAT70A. Figure 9. Circuit for Input Steps with Small C1 For C2 values less than 10nF, a positive voltage step on ...

Page 12

Hot-Swap Controller with External R -48V RTN (SHORT PIN) -48V RTN 1MΩ 549kΩ 549kΩ 1µF NODE1 100V * R6 R5 10kΩ 6.49kΩ 2N2222 Q3 ZVN3310 510kΩ ...

Page 13

RTN (SHORT PIN) -48V RTN ∆ -48V *DIODES INC. SMAT70A. Figure 12. Active-High Enable Module -48V RTN (SHORT PIN) -48V RTN ∆ -48V ...

Page 14

Hot-Swap Controller with External R -48V RTN (SHORT PIN) -48V RTN R4 549kΩ 6.49kΩ 10kΩ 1% -48V *DIODES INC. SMAT70A. **OPTIONAL. Figure 14. Using PWRGD to Drive an Optoisolator pulled high by the module’s ...

Page 15

Applications Information The circuit-breaker current-limit threshold is set to 50mV (typically). Select a sense resistor that causes a drop equal to or above the current-limit threshold at a current level above the maximum normal operating current. Typically, set the overload ...

Page 16

Hot-Swap Controller with External set to twice 5A LOAD DS bles to ≤ 1.25V 4000µF, transient-line input OUT voltage is ∆36V, the 5A charging-current pulse is: µ ...

Page 17

BACKPLANE CIRCUIT CARD -48V RTN -48V RTN (SHORT PIN) INPUT1 -48V (INPUT1) -48V (INPUT2) INPUT2 Chip Information TRANSISTOR COUNT: 2645 PROCESS: BiCMOS ______________________________________________________________________________________ -48V Hot-Swap Controller with External MAX5920A OV V SENSE GATE EE N SENSE ...

Page 18

... 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. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products ...

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