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MAX5938
-48V Hot-Swap Controller with VIN Step Immunity, No RSENSE, and Overvoltage Protection
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Status
Active: In Production.
Description
The MAX5938 is a hot-swap controller for -10V to -80V
rails. The MAX5938 allows circuit line cards to be safely
hot-plugged into a live backplane without causing a
glitch on the power supply. It integrates an adjustable
circuit-breaker function requiring no RSENSE.
The MAX5938 provides a controlled turn-on for circuit
cards, which limits inrush current and prevents both
glitches on the power-supply rail and damage to board
connectors and components. Before startup, the
MAX5938 performs a Load Probe™ test to detect the
presence of a short-circuit condition. If a short-circuit
condition does not exist, the device limits the inrush current
drawn by the load by gradually turning on the external
MOSFET. Once the external MOSFET is fully
enhanced, the MAX5938 provides overcurrent and shortcircuit
protection by monitoring the voltage drop across
the RDS(ON) of the external power MOSFET. The
MAX5938 integrates a 400mA fast GATE pulldown to
guarantee that the external MOSFET is rapidly turned off
in the event of an overcurrent or short-circuit condition.
The MAX5938 also protects the system against input
voltage (VIN) steps. During an input voltage step, the
device limits the current drawn by the load to a safe level
without shutting down the load. The device also includes
ON/OFF control, selectable PGOOD output polarity,
undervoltage (UV) and overvoltage (OV) protection.
The device offers latched (MAX5938L) or autoretry
(MAX5938A) fault management. Both the MAX5938A
and MAX5938L are available in a 16-pin QSOP package
and are specified for the extended (-40°C to +85°C)
temperature range.
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Data Sheet
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Key Features
- -10V to -80V Operation
- No External RSENSE Required
- Drives Large Power MOSFETS
- Eliminates Inrush Current Spikes During Hot Plug into Powered Backplane
- Eliminates Inrush Current Spikes and Dropping of Load During Large VIN Steps
- Adjustable Circuit-Breaker Threshold with Temperature Compensation
- Circuit-Breaker Fault with Transient Rejection
- Shorted Load Detection (Load Probe) Before Power MOSFET Turn-On
- Programmable Load-Voltage Slew Rate Controls Inrush Current
- ±2.4% Accuracy, Programmable Turn-On/Off Voltage (UVLO)
- Overvoltage Fault Protection with Transient Rejection
- Autoretry and Latched Fault Management Available
- Low Quiescent Current (1mA)
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Applications/Uses
- Network Hubs, Switches, Routers
- Network Hubs, Switches, Routers
- Servers
- Solid-State Circuit Breakers
- Telecom Line Cards
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Key Specifications:
| Hot Swap Controllers |
| Part Number |
VIN
(V) |
VIN
(V) |
Circuit Breaker/ Current Limit |
Circuit Breaker/Current Limit Threshold
(mV) |
Fault Condition Control |
Channels |
Positive/Negative Rail |
Package/Pins |
Budgetary Price |
| min |
max |
See Notes |
| MAX5938 |
-10 |
-80 |
Circuit Breaker |
Adjustable |
Periodic Retry |
1 |
Negative |
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$1.85 @1k |
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See All Hot Swap Controllers (53)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
Didn't Find What You Need?
Information Index
Document Ref.: 19-3320
Rev 1;
2005-06-29
This page last modified: 2009-10-07
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