MAX4787:50mA/100mA Current-Limit Switches

The MAX4785-MAX4788 family of switches feature internal current limiting to prevent host devices from being damaged due to faulty load conditions. These analog switches have a low 0.7Ω on-resistance and operate from a 2.3V to 5.5V input voltage range. They are available with guaranteed 50mA and 100mA current limits, making them ideal for 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 MAX4785 and MAX4787 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 MAX4786 and MAX4788 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 MAX4785 and MAX4787 are available in a tiny space-saving 4-pin or 5-pin SC70 package. The MAX4786 and MAX4788 are available only in the 4-pin SC70 package. For higher current current-limiting switches, refer to the MAX4789-MAX4794 and MAX1693 data sheets.

Key Features
  • Guaranteed Current Limit: 50mA, 100mA
  • Thermal-Shutdown Protection
  • Reverse-Current Protection
  • 0.7Ω On-Resistance
  • 14ms Guaranteed Blanking Time
  • FLAG-bar Function (MAX4785/MAX4787)
  • 65µA Supply Current
  • 8µA Latch-Off Current (MAX4785/MAX4787)
  • 0.01µA Shutdown Current
  • 2.3V to 5.5V Supply Range
  • Undervoltage Lockout
  • Fast Current-Limit Response Time
  • Tiny SC70 Package
MAX4785, MAX4786, MAX4787, MAX4788: Functional Diagram
MAX4785, MAX4786, MAX4787, MAX4788: Functional Diagram
Applications/Uses
  • Cell Phones
  • Global Positioning Systems (GPS)
  • Handheld Devices
  • PDAs and Palmtop Devices
DataSheet
titleDownload file
MAX4785-MAX4788 Data SheetMAX4785-MAX4788.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
MAX478515050Yes41Preset0.72.35.5-40 to +85SC-70/4
SC-70/5
$1.41 @1k
MAX47865050NoSC-70/4-
MAX4787100100YesSC-70/4
SC-70/5
$1.41 @1k
MAX4788100100NoSC-70/4$1.70 @1k
Quality and Environmental Data
Related Products
  • MAX4789:200mA/250mA/300mA Current-Limit Switches
  • MAX4792:200mA/250mA/300mA Current-Limit Switches
  • MAX4790:200mA/250mA/300mA Current-Limit Switches
  • MAX4793:200mA/250mA/300mA Current-Limit Switches
  • MAX4791:200mA/250mA/300mA Current-Limit Switches
  • MAX4794:200mA/250mA/300mA Current-Limit Switches
  • MAX890:1.2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX4787EXKNo Longer AvailableMAX4787EXK+SC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX4787EXK+ActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
MAX4787EXK+TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
MAX4787EXK-TNo Longer AvailableMAX4787EXK+TSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX4787EXS+ActiveSC-70,;4 pin;5.4 mm²-40°C to +85°CLead Free
MAX4787EXS+TActiveSC-70,;4 pin;5.4 mm²-40°C to +85°CLead Free
MAX4787EXS-TNo Longer AvailableMAX4787EXS+TSC-70,;4 pin;5.4 mm²-40°C to +85°CNo
MAX4785-MAX4788.pdf MAX4788
MAX4787.pdf MAX4787
MAX4785-MAX4788.pdf MAX4788