MAX4789 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 200mA/250mA/300mA Current-Limit Switches

19-2663; Rev 2; 2/05
200mA/250mA/300mA Current-Limit Switches
General Description
The MAX4789–MAX4794 family of switches feature
internal current limiting to prevent damage to host
devices due to faulty load conditions. These analog
switches have a low 0.2Ω on-resistance and operate
from 2.3V to 5.5V input voltage range. They are avail-
able with guaranteed 200mA, 250mA, and 300mA cur-
rent limits, making them ideal for SDIO and other 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 MAX4789, MAX4791, and MAX4793 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 MAX4790, MAX4792, and MAX4794 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 MAX4789–MAX4794 are available in 6-pin 3mm x
3mm TDFN and tiny space-saving 4-pin SOT143 pack-
ages. The MAX4789/MAX4791/MAX4793 are also avail-
able in a tiny 5-pin SOT23 package. For lower current
current-limiting switches, refer to the MAX4785–MAX4788
data sheet.
Applications
PDAs and Palmtop Devices
Cell Phones
GPS Systems
Hand-Held Devices
SDIO
Pin Configurations
TOP VIEW
IN 1
GND 2
ON 3
MAX4789
MAX4791
MAX4793
5 OUT OUT 1
4 FLAG GND 2
MAX4789–
MAX4794
4 IN
3 ON
SOT23
SOT143
Pin Configurations continued at end of data sheet.
Features
♦ Guaranteed Current Limit: 200mA, 250mA, 300mA
♦ Thermal-Shutdown Protection
♦ Reverse Current Protection
♦ 0.2Ω On-Resistance
♦ 14ms Guaranteed Blanking Time
♦ FLAG Function (MAX4789/MAX4791/MAX4793)
♦ 80µA Supply Current
♦ 8µA Latch-Off Current
(MAX4789/MAX4791/MAX4793)
♦ 0.01µA Shutdown Current
♦ 2.3V to 5.5V Supply Range
♦ Undervoltage Lockout
♦ Fast Current-Limit Response Time (5µs)
♦ TDFN and SOT23/SOT143 Packages
Ordering Information
PART
TEMP RANGE PIN-PACKAGE ^TOP
MARK
MAX4789EUS-T -40°C to +85°C 4 SOT143-4
KAFE
MAX4789EUK-T -40°C to +85°C 5 SOT23-5
AEAC
MAX4789ETT
-40°C to +85°C 6 TDFN-EP*
ABO
MAX4790EUS-T -40°C to +85°C 4 SOT143-4
KAFF
MAX4790ETT
-40°C to +85°C 6 TDFN-EP
ABP
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Typical Operating Circuit
2.3V TO 5.5V
IN
ON
MAX4789 ^FLAG
µP
MAX4791
MAX4793
TO SDIO PORT
OUT
GND
________________________________________________________________ Maxim Integrated Products 1
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