MAX4772 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 200mA/500mA Selectable Current-Limit Switches

19-2926; Rev 0; 7/03
200mA/500mA Selectable
Current-Limit Switches
General Description
The MAX4772/MAX4773 switches feature selectable
internal current limiting to prevent damage to host
devices due to faulty load conditions. The
MAX4772/MAX4773 include a logic input to select a
guaranteed 200mA or 500mA current limit, making them
ideal for SDIO and other load-switching applications.
These analog switches have a low 0.2Ω on-resistance
and operate from a 2.0V to 4.5V input voltage range.
When the switch is on and a load is connected to the
port, a guaranteed blanking time of 14ms ensures that
the transient voltage settles down. If, after this blanking
time, the load current is greater than the current limit,
the MAX4772 switch is turned off and issues a FLAG to
the microprocessor. The switch can be turned on again
by cycling the power or the ON input.
The MAX4773 has an autoretry feature where the switch
turns off and issues a FLAG to the microprocessor 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 and FLAG
deasserts.
The MAX4772/MAX4773 are available in tiny space-sav-
ing 6-pin SOT23 and 6-pin TDFN (3mm x 3mm) pack-
ages.
Applications
SDIO
PDAs and Palmtop Devices
Cell Phones
GPS Systems
Hand-Held Devices
Typical Operating Circuit
2.0V TO 4.5V
Features
o Guaranteed Current Limit: 200mA or 500mA
o Thermal-Shutdown Protection
o Reverse-Current Protection
o 0.2Ω On-Resistance (SEL = High)
o 14ms Guaranteed Blanking Time
o FLAG Function
o Autoretry (MAX4773)
o 80µA Supply Current
o 6µA Latch-Off Current (MAX4772)
o 0.01µA Shutdown Current
o 2.0V 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
MAX4772EUT-T
MAX4772ETT*
MAX4773EUT-T
MAX4773ETT*
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
6 SOT23-6
6 TDFN-EP**
6 SOT23-6
6 TDFN-EP**
*Future product—contact factory for availability.
**EP—Exposed pad.
TOP
MARK
ABND
—
ABNE
—
Selector Guide
PART
MAX4772EUK-T
MAX4772ETT
MAX4773EUK-T
MAX4773ETT
AUTORETRY
No
No
Yes
Yes
Pin Configurations
IN
ON
MAX4772 ^FLAG
µP
MAX4773
TO SDIO PORT
SEL
OUT
GND
TOP VIEW
IN 1
GND 2
ON 3
MAX4772
MAX4773
6 OUT
5 SEL
4 FLAG
IN 1
OUT 2
SEL 3
MAX4772
MAX4773
6 ON
5 GND
4 FLAG
SOT23
TDFN
________________________________________________________________ Maxim Integrated Products 1
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