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MAX5944
Dual FireWire Current Limiter and Low-Drop ORing Switch Controller
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Status
Active: In Production.
Description
The MAX5944 is a dual, current limiter/low-drop ORing,
switch controller power-management IC for FireWire®
applications. Each independent channel controls two
external power MOSFETs to regulate current from the
input power supply to the load and performs low-voltagedrop
power-supply ORing. The MAX5944 operates over
the 7.5V to 37V input range and provides inrush and output
current limit in addition to diode ORing functions suitable
for FireWire applications.
The MAX5944 allows the safe insertion and removal of
FireWire peripherals into a live FireWire port by providing
inrush current control and output current-limiting functions.
The MAX5944 features a current-limit function that
actively limits the current drawn by the load with a 2ms
timeout. Its autoretry function then automatically restarts
after the 259ms autoretry delay time.
The ORing feature provides a very efficient way to protect
the FireWire port when connected to another
FireWire peripheral that sources a higher voltage. By
turning off the external MOSFETS, the MAX5944 provides
a true bidirectional load disconnect. Each channel has
an independent ON/OFF control that results in less than
10µA supply current per channel.
The MAX5944 operates over the -40°C to +85°C
extended temperature range and is available in a
16-pin SO package.
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Data Sheet
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An evaluation kit is available: MAX5944EVKIT
Key Features
- Provides Safe Hot-Swap for 7.5V to 37V Power Supplies
- Dual-Channel Hot-Swap
- Low-Drop Power ORing with Ultra-Fast Turn-Off
- Active Current Limit
- ±5% Current-Limit Sensing Accuracy
- 2ms Current-Limit Timeout
- Fast Current-Limit Response to Output Short-Circuit Conditions
- Drives External n-Channel Power MOSFETs
- Independent Overcurrent Fault Status Outputs
- 259ms Autoretry Period
- 10µA (Per Channel) Shutdown Current
- Independent ON/OFF Control Allows Undervoltage Lockout Programming
- Fast Load Disconnect Control Through ON/OFF Inputs
- Bidirectional Load Disconnect
- Power Routing from One Port to Another
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Applications/Uses
- FireWire® Desktop/Notebook Port
- FireWire® Hub
- FireWire® Peripheral Device Current Limit
- Hot Swap
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Key Specifications:
| Hot Swap Controllers |
| Part Number |
VIN
(V) |
VIN
(V) |
Circuit Breaker/ Current Limit |
Fault Condition Control |
Channels |
Positive/Negative Rail |
Package/Pins |
Budgetary Price |
| min |
max |
See Notes |
| MAX5944 |
7.5 |
37 |
Current Limit |
Periodic Retry |
2 |
Positive |
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$2.32 @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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| ORing MOSFET Controllers |
| Part Number |
Reverse Current Protect. |
Under Voltage Protect |
Charge Pump Cap. |
Soft Start |
Enable |
Fault Indicator |
EV Kit |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Oper. Temp.
(°C) |
Budgetary Price |
| max w/pins |
See Notes |
| MAX5944 |
Yes |
Yes |
No |
Yes |
Yes |
Yes |
Yes |
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62 |
-40 to +85 |
$2.32 @1k |
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See All ORing MOSFET Controllers (5)
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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.: 19-3426
Rev 0;
2004-10-20
This page last modified: 2009-10-07
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