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MAX4789–MAX4794
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 available with guaranteed 200mA, 250mA, and 300mA 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 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 packages. The MAX4789/MAX4790/MAX4791/MAX4793 are also available 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 ●● Handheld Devices ●● SDIO
Benefits and 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
Typical Operating Circuit
2.3V TO 5.5V
IN
ON MAX4789 FLAG MAX4791 MAX4793 TO SDIO PORT OUT
GND
µP
Ordering Information and Selector Guide appear at end of data sheet.
19-2663; Rev 5; 8/19
MAX4789–MAX4794
200mA/250mA/300mA Current-Limit Switches
Absolute Maximum Ratings
IN, ON, FLAG, OUT to GND....................................-0.3V to +6V OUT Short Circuit to GND.................................Internally Limited Continuous Power Dissipation (TA = +70°C) 4-Pin SOT143 (derate 4.0mW/°C above +70°C).........320mW 5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW 6-Pin TDFN (derate 24.4mW/°C above +70°C)......1951.2mW
Operating Temperature Range............................ -40°C to +85°C Junction Temperature.......................................................+150°C Storage Temperature Range............................. -65°C to +150°C Lead Temperature (soldering, 10s).................................. +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Package Information
PACKAGE TYPE: 4 SOT143 Package Code Outline Number
U4+2 21-0052
PACKAGE TYPE: 5 SOT23
Package Code
U5+2, U5+2A
Outline Number
21-0057
THERMAL RESISTANCE (FOUR-LAYER BOARD)
Junction to Ambient (θJA) Junction to Case (θJC)
255.9°C/W 81°C/W
PACKAGE TYPE: 6 TDFN Package Code Outline Number
T633+2 21-0137
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
www.maximintegrated.com
Maxim Integrated │ 2
MAX4789–MAX4794
200mA/250mA/300mA Current-Limit Switches
Electrical Characteristics
(VIN = 2.3V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Operating Voltage Quiescent Current
Latch-Off Current (Note 2)
VIN IQ
ILATCH
VON = VIN, IOUT = 0, VIN = +2.3V to +5.0V
switch on
VIN = +5.0V to +5.5V
VON = VIN, after an overcurrent fault
(MAX4789/MAX4791/MAX4793)
2.3
5.5 V 80 120
160 µA
8 15 µA
Shutdown Current
ISHDN
VON = 0V MAX4789.