MAX4791:200mA/250mA/300mA Current-Limit Switches

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 active-low 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/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.

Key Features
  • Guaranteed Current Limit: 200mA, 250mA, 300mA
  • Thermal-Shutdown Protection
  • Reverse Current Protection
  • 0.2Ω On-Resistance
  • 14ms Guaranteed Blanking Time
  • Active-Low 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
MAX4789, MAX4790, MAX4791, MAX4792, MAX4793, MAX4794: Typical Operating Circuit
MAX4789, MAX4790, MAX4791, MAX4792, MAX4793, MAX4794: Typical Operating Circuit
Applications/Uses
  • Cell Phones
  • Global Positioning Systems (GPS)
  • Handheld Devices
  • PDAs and Palmtop Devices
  • SDIO
DataSheet
titleDownload file
MAX4789-MAX4794 Data SheetMAX4789-MAX4794.pdf
Parametrics
Part NumberPower SwitchesCurrent Limit
(mA)
Current Limit
(mA)
Fault IndicatorCurrent Limit Accuracy
(%)
Current Limit Set ByRON
(Ω)
VSUPPLY
(V)
VSUPPLY
(V)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxtypminmaxSee Notes
MAX47891200200Yes20Preset0.22.35.5-40 to +85SOT/4
SOT/5
TDFN-EP/6
$1.44 @1k
MAX4790200200No-40 to +85SOT/4
TDFN-EP/6
$1.20 @1k
MAX4791250250Yes-40 to +85
-40 to +105
SOT/4
SOT/5
TDFN-EP/6
-
MAX4793300300Yes-40 to +85SOT/4
SOT/5
TDFN-EP/6
$1.44 @1k
MAX4794300300No-40 to +85SOT/4
TDFN-EP/6
$1.20 @1k
Quality and Environmental Data
Related Products
  • MAX4787:50mA/100mA Current-Limit Switches
  • MAX4788:50mA/100mA Current-Limit Switches
  • MAX4785:50mA/100mA Current-Limit Switches
  • MAX4786:50mA/100mA Current-Limit Switches
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX4791ETT-TNo Longer AvailableTDFN-EP,;6 pin;9.6 mm²-40°C to +85°CNo
MAX4791EUK+ActiveSOT,;5 pin;9 mm²-40°C to +85°CLead Free
MAX4791EUK+TActiveSOT,;5 pin;9 mm²-40°C to +85°CLead Free
MAX4791EUK-TNo Longer AvailableMAX4791EUK+TSOT,;5 pin;9 mm²-40°C to +85°CNo
MAX4791EUK/V+TNRNDSOT,;5 pin;9 mm²-40°C to +85°CLead Free
MAX4791EUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX4789-MAX4794.pdf MAX4794
MAX4791.pdf MAX4791
MAX4789-MAX4794.pdf MAX4794