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PDF MAX4785EXK-T Data sheet ( Hoja de datos )
| Número de pieza | MAX4785EXK-T | |
| Descripción | 50mA/100mA Current-Limit Switches | |
| Fabricantes | Maxim Integrated Products | |
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19-2664; Rev 1; 4/03
50mA/100mA Current-Limit Switches
General Description
The MAX4785–MAX4788 family of switches feature inter-
nal 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 avail-
able 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 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 condi-
tion 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.
Applications
PDAs and Palmtop Devices
Cell Phones
GPS Systems
Hand-Held Devices
TOP VIEW
Pin Configurations
OUT 1
GND 2
FLAG 3
MAX4785
MAX4787
5 IN
4 ON
OUT 1
GND 2
MAX4785–
MAX4788
4 IN
3 ON
SC70
SC70
Features
o Guaranteed Current Limit: 50mA, 100mA
o Thermal-Shutdown Protection
o Reverse-Current Protection
o 0.7Ω On-Resistance
o 14ms Guaranteed Blanking Time
o FLAG Function (MAX4785/MAX4787)
o 65µA Supply Current
o 8µA Latch-Off Current (MAX4785/MAX4787)
o 0.01µA Shutdown Current
o 2.3V to 5.5V Supply Range
o Undervoltage Lockout
o Fast Current-Limit Response Time
o Tiny SC70 Package
PART
MAX4785EXS-T
MAX4785EXK-T
MAX4786EXS-T
MAX4787EXS-T
MAX4787EXK-T
MAX4788EXS-T
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
4 SC70-4
5 SC70-5
4 SC70-4
4 SC70-4
5 SC70-5
4 SC70-4
TOP
MARK
AGE
ADL
AGF
AGG
AND
AGH
Selector Guide appears at end of data sheet.
Typical Operating Circuit
2.3V TO 5.5V
IN
ON
MAX4785 FLAG
MAX4787
µP
TO EXTERNAL PORT
OUT
GND
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
50mA/100mA Current-Limit Switches
Typical Operating Characteristics (continued)
(VIN = 3.3V, TA = +25°C, unless otherwise noted.)
CURRENT-LIMIT RESPONSE
(OUT SHORTED TO GND)
MAX4785 toc13
CIN = 1µF
COUT = 1µF
VIN
2V/div
SWITCH TURN-ON TIME RESPONSE
MAX4785 toc14
VIN = 3.3V
VON
VOUT
2V/div
IOUT
10mA/div
40µs/div
IOUT
2A/div
100µs/div
SWITCH TURN-OFF TIME RESPONSE
MAX4785 toc15
VIN = 3.3V
VON
2V/div
IOUT
10mA/div
100ns/div
FLAG-BLANKING RESPONSE
MAX4785 toc16
VIN
2V/div
VON
2V/div
4ms/div
FLAG
2V/div
IOUT
100mA/div
PIN
SC70
SC70
11
22
—3
34
45
Pin Description
NAME
FUNCTION
OUT
GND
FLAG
ON
IN
Switch Output. Bypass with a 0.1µF capacitor to ground.
Ground
Fault Output. This open-drain output goes low when the device stays in forward or reverse
current limit for more than the blanking time period. FLAG is high impedance when a fault is
not present or when ON is low.
Active-High Switch-On Input. A logic high turns the switch on.
Input. Bypass with a 0.1µF ceramic capacitor to ground.
_______________________________________________________________________________________ 5
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