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MAX4785, MAX4786, MAX4787, MAX4788
50mA/100mA Current-Limit Switches
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Status
Active: In Production.
Description
The MAX4785-MAX4788 family of switches feature internal
current limiting to prevent host devices from being
damaged due to faulty load conditions. These analog
switches have a low 0.7Ω on-resistance and operate
from a 2.3V to 5.5V input voltage range. They are available
with guaranteed 50mA and 100mA current limits,
making them ideal for load-switching applications.
When the switch is on and a load is connected to the
port, a guaranteed blanking time of 14ms ensures that
the transient voltages settle down. If after this blanking
time the load current is greater than the current limit,
the MAX4785 and MAX4787 enter a latch-off state
where the switch is turned off and active-low FLAG is issued to the
microprocessor. The switch can be turned on again by
cycling the power or the ON pin.
The MAX4786 and MAX4788 have an autoretry feature
where the switch turns off after the blanking time and
then continuously checks to see if the overload condition
is present. The switch remains on after the overload
condition disappears.
The MAX4785 and MAX4787 are available in a tiny
space-saving 4-pin or 5-pin SC70 package. The
MAX4786 and MAX4788 are available only in the 4-pin
SC70 package. For higher current current-limiting
switches, refer to the MAX4789-MAX4794 and
MAX1693 data sheets.
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Data Sheet
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Key Features
- Guaranteed Current Limit: 50mA, 100mA
- Thermal-Shutdown Protection
- Reverse-Current Protection
- 0.7Ω On-Resistance
- 14ms Guaranteed Blanking Time
- FLAG-bar Function (MAX4785/MAX4787)
- 65µA Supply Current
- 8µA Latch-Off Current (MAX4785/MAX4787)
- 0.01µA Shutdown Current
- 2.3V to 5.5V Supply Range
- Undervoltage Lockout
- Fast Current-Limit Response Time
- Tiny SC70 Package
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Applications/Uses
- Cell Phones
- Global Positioning Systems (GPS)
- Handheld Devices
- PDAs and Palmtop Devices
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Key Specifications:
| Current Limit and USB Power Switches |
| Part Number |
Power Switches |
Current Limit
(mA) |
Current Limit
(mA) |
Fault Indicator |
Current Limit Accuracy
(%) |
Current Limit Set By |
RON
(Ω) |
VSUPPLY
(V) |
VSUPPLY
(V) |
Oper. Temp.
(°C) |
Package/Pins |
Budgetary Price |
| ≥ |
≤ |
typ |
min |
max |
See Notes |
| MAX4785 |
1 |
50 |
50 |
Yes |
41 |
Preset |
0.7 |
2.3 |
5.5 |
-40 to +85 |
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$1.06 @1k |
| MAX4786 |
50 |
50 |
No |
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$1.06 @1k |
| MAX4787 |
100 |
100 |
Yes |
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$0.94 @1k |
| MAX4788 |
100 |
100 |
No |
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$1.06 @1k |
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See All Current Limit and USB Power Switches (77)
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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
Functional Diagram
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-2664
Rev 1;
2003-05-26
This page last modified: 2009-10-14
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