max5923eupt Maxim Integrated Products, Inc., max5923eupt Datasheet

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max5923eupt

Manufacturer Part Number
max5923eupt
Description
Max5923 +60v Simple Swapper Hot-swap Switch
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
The MAX5923 is a fully integrated Simple Swapper™
hot-swap switch for positive supply rails. The device
allows the safe insertion and removal of circuit cards
into live backplanes or ports without causing glitches
on the power-supply rail. The device also monitors vari-
ous circuit parameters and disconnects the load if a
fault condition occurs, alerting the host with a logic-
level FAULT output. The MAX5923 operates over the
+16V to +60V input voltage range.
During startup, an integrated 0.45Ω power MOSFET
regulates the current and voltage between the back-
plane power source and the load. After startup, the
MOSFET is fully enhanced to reduce its on-resistance.
To ensure robust operation, the MAX5923 contains
built-in safety features that monitor fault conditions and
prevent damage to the internal MOSFET.
The MAX5923 monitors three parameters for fault condi-
tions: zero current, overcurrent, and thermal overload.
The output overcurrent limit counts the time the MAX5923
spends in an overcurrent condition and shuts down the
pass transistor if the current limit is exceeded for the over-
current time limit. The zero-current detection counts the
time the output current is below the zero-current threshold
and shuts down the pass transistor if the counter reaches
the zero-current time limit. The thermal monitoring feature
shuts down the pass transistor if the die temperature
reaches the overtemperature limit. A fault logic output
indicates when an overtemperature or an overcurrent
condition has occurred and a zero-current logic output
indicates if there is a zero-current condition.
An undervoltage detection circuitry keeps the pass tran-
sistor off until the input voltage is above the undervoltage
lockout (UVLO) threshold, which is internally set or can be
set externally with a resistive divider. A power-OK (POK)
output is provided to signal when the output voltage has
reached to within 0.75V of the input voltage. An Enable
input allows the host system to disconnect the system
from the load and/or reset a fault condition by toggling
Enable.
The MAX5923 is available in a 20-pin TSSOP package
and operates in the extended -40°C to +85°C tempera-
ture range.
19-2850; Rev 0; 4/03
Simple Swapper is a trademark of Maxim Integrated Products, Inc.
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.
Network Routers/Switches
Current Limiter
________________________________________________________________ Maxim Integrated Products
+60V Simple Swapper Hot-Swap Switch
General Description
Servers
Industrial Equipment
Applications
o Wide Operating Input Range: +16V to +60V
o 0.45Ω Integrated Power Switch
o Programmable Output Current Up to 800mA
o Over/Undercurrent-Limit Detection
o Input Logic Signals Compatible with 1.8V to 5V
o Separate Analog and Digital Grounds with Up to
o Power-OK Status Output
o Overcurrent Protection with Status Outputs
o Built-In Thermal Shutdown
o Internal Switch Protection Circuitry
o Current-Limit Foldback with Timeout and Duty-
o Latch or Autorestart Fault Management
Pin Configuration appears at end of data sheet.
MAX5923EUP
+16V TO +60V
CMOS Logic
±4V Offset
Cycle Control
R
OFF
SENSE
PART
ON
IN
DRAIN
UVLO
EN
AGND_S
ALL SIGNAL AND DIGITAL INPUTS/OUTPUTS ARE REFERENCED TO DGND.
DGND CAN BE ±4V FROM AGND_S.
Typical Operating Circuit
MAX5923
Ordering Information
-40°C to +85°C
TEMP RANGE
LATCH
ZC_EN
FAULT
DGND
VDIG
OUT
POK
ZC
D1
R
PU
R
PU
PIN-PACKAGE
20 TSSOP
R
Features
PU
+1.65V TO +5.5V
1

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max5923eupt Summary of contents

Page 1

... Network Routers/Switches Servers Current Limiter Industrial Equipment Simple Swapper is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ 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. o Wide Operating Input Range: +16V to +60V o 0.45Ω ...

Page 2

Simple Swapper Hot-Swap Switch ABSOLUTE MAXIMUM RATINGS All Voltages with Respect to AGND_S, Unless Otherwise Noted IN ............................................................................-0.3V to +76V UVLO ........................................................................-0.3V to +6V VDIG to DGND .........................................................-0.3V to +6V OUT .......................................................-0. DRAIN ..........................................................-0. EN, ...

Page 3

Simple Swapper Hot-Swap Switch ELECTRICAL CHARACTERISTICS (continued 48V, VDIG = 3.3V, AGND_S = AGND = DGND = 0V otherwise noted. Typical values are PARAMETER SYMBOL t POK_LOW POK Output Delay (Note 5) ...

Page 4

Simple Swapper Hot-Swap Switch (V = 48V, VDIG, EN, LATCH, CLASS, ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V +25°C, unless otherwise noted SUPPLY CURRENT IN vs. INPUT VOLTAGE 1.00 ...

Page 5

Simple Swapper Hot-Swap Switch (V = 48V, VDIG, EN, LATCH, CLASS, ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V +25°C, unless otherwise noted.) A DIGITAL SUPPLY CURRENT vs. VDIG ...

Page 6

Simple Swapper Hot-Swap Switch (V = 48V, VDIG, EN, LATCH, CLASS, ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V +25°C, unless otherwise noted.) A ZERO CURRENT HIGH-TO-LOW DETECTION TIME WAVEFORM V OUT ...

Page 7

Simple Swapper Hot-Swap Switch (V = 48V, VDIG, EN, LATCH, CLASS, ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V +25°C, unless otherwise noted.) A OUTPUT SHORT-CIRCUIT RESPONSE 10A/div 20V/div 4µs/div PIN NAME ...

Page 8

Simple Swapper Hot-Swap Switch PIN NAME Digital Ground. DGND can vary ±4V from AGND. DGND and AGND must be connected together DGND single point in the system. Fault Management Selection Digital Input. Referenced to DGND. Connect ...

Page 9

Simple Swapper Hot-Swap Switch V = 16V TO 60V MAX5923 UVLO R2 AGND Figure 1. Setting Undervoltage Lockout with an External Resistive Divider VDIG is the input supply for the internal logic circuitry. The logic input ...

Page 10

Simple Swapper Hot-Swap Switch I LIMIT I OUT 0V V FAULT RESTART Figure 3. Periodic Overcurrent Without Generating a Fault Output Clamping During Short Circuit During an output short-circuit condition, the energy stored in the ...

Page 11

Simple Swapper Hot-Swap Switch +16V TO +60V 1µF 100µF (100V) 0.5Ω (100V) (1W) ON OFF 1Ω (1/16W) ALL SIGNAL AND DIGITAL INPUTS/OUTPUTS ARE REFERENCED TO DGND. DGND CAN BE ±4V FROM AGND_S. Pin Configuration TOP VIEW DRAIN 1 20 ...

Page 12

Simple Swapper Hot-Swap Switch (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry other than circuitry ...

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