General Description
The MAX16165/MAX16166 monitor up to five voltages
and sequence up to four voltages. These devices
provide an adjustable delay as each supply is turned on
as well as monitor each power-supply voltage, including
the input voltage VDD.
The MAX16165/MAX16166 operate from a supply range
of 2.7V to 16V and have an internal regulator output
(ABP), power internal circuits, and supply more than
1mA additional current to any external circuitry.
The sequencing is enabled by two inputs, ON and OFF.
A rising edge on the ON input initiates power-on
sequencing of the channels whereas a falling edge on
OFF input initiates power-off sequencing. During the
power-on sequencing, when all of the voltages reach
their final values, a sequencing done output DONE
asserts high followed by a Power-OK (POK) output after
the reset delay timer has expired, allowing the
microcontroller (μC) to operate. If any voltage falls below
its threshold, the reset output asserts and all voltage
supplies are turned off. When the sequencer initiates a
power-off sequencing, the MAX16165/MAX16166 can
reverse sequence the outputs.
Output options available are open-drain (MAX16165)
and push-pull (MAX16166). The MAX16165/MAX16166
can be daisy-chained unlimited amount to time to control
any number of voltages in a system.
The MAX16165/MAX16166 feature a bidirectional active
low FAULT input/output, which asserts low during any
fault condition. FAULT stays low as long as an
undervoltage event is present at UVSET Input and it is a
one-shot output during all other FAULT conditions. An
external signal pulling FAULT low disables all outputs
immediately. The MAX16165/MAX16166 are available
in a 1.63mm x 2.03mm, 20-bump Wafer-Level Package
(WLP) and a 4mm x 4mm, 20L TQFN package. The
device is fully specified over the -40°C to +125°C
operating temperature range.

Applications
• Latch-Up Prevention and Inrush Current Protection
in Multi-Supply Systems
• FPGA/ASIC Power Supply Sequencing
• Servers and Security Cameras
• Test Equipment
• Networking Equipment
• Industrial Sensors and Motor Controls

Benefits and Features
• 2.7V to 16.0V Wide Operating Voltage Range
• Monitor Up to Five Voltages
• Sequence Up to Four Voltages
• Power-Off in Reverse Order or Simultaneously
• Unlimited Daisy-Chain
• Capacitor-Adjustable Sequencing Delay
• Capacitor-Adjustable Power-Good Timeout
• Resistor-Configurable Power-Supply On and
Off Thresholds
• Open-Drain (MAX16165)/Push-Pull (MAX16166)
Outputs
• POK Output for System Microcontroller Reset
• Bidirectional FAULT Input/Output
• 4 x 5-Bump WLP and 20L TQFN Package
• -40°C to +125°C Operating Temperature Range