MAX4795 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – 450mA/500mA Current-Limit Switches

19-2944; Rev 0; 8/03
450mA/500mA Current-Limit Switches
General Description
The MAX4795–MAX4798 family of switches feature inter-
nal 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 a 2.0V
to 4.5V input voltage range. They are available with guar-
anteed 450mA and 500mA current 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 the
transient voltages settle down. If after this blanking time,
the load current is greater than the current limit, the
MAX4795 and MAX4797 switches are turned off and
FLAG is issued to the microprocessor. The switch can be
turned on again by cycling the power or the ON input.
The MAX4796 and MAX4798 have an autoretry feature
where the switch turns off and issues a FLAG to the
microprocessor after the blanking time and then contin-
uously checks to see if the overload condition is pre-
sent. The switch remains on after the overload condition
disappears and FLAG deasserts.
The MAX4795–MAX4798 are available in tiny, space-
saving, 5-pin SOT23 and 6-pin TDFN (3mm x 3mm)
packages.
Applications
SDIO
PDAs and Palmtop Devices
Cell Phones
GPS Systems
Hand-Held Devices
Typical Operating Circuit
+2.0V TO +4.5V
IN
ON
MAX4795 ^FLAG
µP
MAX4796
MAX4797
MAX4798
TO SDIO PORT
OUT
GND
Features
o Guaranteed Current Limit: 450mA and 500mA
o Thermal-Shutdown Protection
o Reverse-Current Protection
o 0.2Ω On-Resistance
o 14ms Guaranteed Blanking Time
o FLAG Function
o Autoretry (MAX4796/MAX4798)
o 80µA Supply Current
o 6µA Latchoff Current
(MAX4795/MAX4797)
o 0.01µA Shutdown Current
o +2V to +4.5V Supply Range
o Fast Current-Limit Response Time
o Tiny SOT23 and TDFN Packages
o UL Certification Pending
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX4795EUK-T -40°C to +85°C
MAX4795ETT*
40°C to +85°C
5 SOT23-5
6 TDFN-EP**
MAX4796EUK-T -40°C to +85°C 5 SOT23-5
MAX4796ETT* -40°C to +85°C 6 TDFN-EP**
MAX4797EUK-T -40°C to +85°C 5 SOT23-5
MAX4797ETT* -40°C to +85°C 6 TDFN-EP**
MAX4798EUK-T -40°C to +85°C 5 SOT23-5
MAX4798ETT* -40°C to +85°C 6 TDFN-EP**
*Future product—contact factory for availability.
**EP = Exposed pad.
TOP
MARK
AEDI
—
AEDJ
—
AEDK
—
AEDL
—
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
IN 1
GND 2
ON 3
MAX4795
MAX4796
MAX4797
MAX4798
5 OUT IN 1
OUT 2
4 FLAG N.C. 3
MAX4795
MAX4796
MAX4797
MAX4798
6 ON
5 GND
4 FLAG
SOT23
TDFN
________________________________________________________________ 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.