Voltage Monitors/Sequencer Circuits with Reverse-Sequencing Capability

Easy-to-Use, Four-/Five-Voltage, Power-Up/Power-Down Sequencer/Monitors

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The MAX16050 monitors up to 5 voltages and sequences up to 4 voltages, while the MAX16051 monitors up to 6 voltages and sequences up to 5 voltages. These devices provide an adjustable delay as each supply is turned on and they monitor each power-supply voltage, including the input voltage VCC. When all of the voltages reach their final values and the reset delay timer expires, a power-on-reset (active-low RESET) output deasserts allowing the micro controller (µC) to operate. If any voltage falls below its threshold, the reset output asserts and all voltage supplies are turned off. The MAX16050/MAX16051 can be daisy-chained to control a higher number of voltages in a system.

During a power-down event, the MAX16050/MAX16051 can reverse sequence the outputs. In this situation, each voltage is turned off sequentially until it reaches a 250mV level, at which point, the next supply is turned off. The MAX16050/MAX16051 also provide internal pulldown circuitry that turns on during power-down, to help discharge large output capacitors.

The MAX16050/MAX16051 feature a charge-pump supply output that can be used as a pullup voltage for driving external n-channel MOSFETs and an overvoltage output that indicates when any of the monitored voltages exceeds its overvoltage threshold. The MAX16050 also provides three sequence control inputs for changing the sequence order, while the MAX16051 has a fixed sequence order.

The MAX16050/MAX16051 are available in a 28-pin (4mm x 4mm) thin QFN package and are fully specified over the -40°C to +85°C extended operating temperature range.

Design Solution: Avoid Catastrophic Power Failures with Proper Voltage Sequencing and Monitoring ›

Monitoring Multiple Voltages and Setting Up Power-Up/Down Sequencing with the MAX16050/MAX16051

MAX16050, MAX16051: Typical Operating Circuit MAX16050, MAX16051: Typical Operating Circuit Enlarge+

Key Features

  • Monitor Up to 6 Voltages/Sequence Up to 5 Voltages (MAX16051)
  • Pin-Selectable Sequencing Order (MAX16050 Only)
  • Reverse-Sequencing Capability on Shutdown
  • Overvoltage Monitoring with Independent Output
  • ±1.5% Threshold Accuracy
  • 2.7V to 16V Operating Voltage Range
  • Charge Pump to Fully Enhance External n-Channel FETs
  • Capacitor-Adjustable Sequencing Delay
  • Fixed or Capacitor-Adjustable Reset Timeout
  • Internal 85mA Pulldowns for Discharging Capacitive Loads Quickly
  • Daisy-Chaining Capability to Communicate Across Multiple Devices
  • Small 4mm x 4mm, 28-Pin TQFN Package


  • Networking Systems
  • Servers
  • Storage Systems
  • Telecom Equipment
  • Workstations

See parametric specs for Power-Supply Sequencers and Voltage Trackers (44)

Part NumberOptionInterfaceInput Chan.VIN
Oper. Temp.
maxSee Notes
MAX16050 Sequence
Factory Fixed
R/C Adjustable
-40 to +85
$3.14 @1k
MAX16051 6
$4.89 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX16050EVKIT: Evaluation Kit for the MAX16050
Product Reliability Reports: MAX16050.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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