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ADM1186:  Quad Voltage Sequencer and Monitor with Programmable Timing

Product Details


The ADM1186-1 and ADM1186-2 are integrated, four-channel, voltage monitoring and sequencing devices. A 2.7 V to 5.5 V power supply is required on the VCC pin for power. Four precision comparators monitor four voltage rails, with all comparators sharing a 0.6 V reference and a worst-case accuracy of 0.8%. Resistor networks that are external to the VIN1, VIN2, VIN3, and VIN4 pins set the Under Voltage (UV) trip points for the monitored supply rails. The ADM1186-1 and ADM1186-2 have four open drain enable outputs, OUTx, that are used to enable power supplies. An open drain power good output, PWRGD, is provided that indicates the four VINx inputs are above their UV thresholds. A state machine monitors the state of the UP and DOWN pins on the ADM1186-1 or the UP/overbar: DOWN pin on the ADM1186-2 to control the supply sequencing direction. In the ‘Wait Start’ state, a rising edge transition on the UP or UP/DOWN pin triggers a power-up sequence. A falling edge transition on the DOWN or UP/DOWN pin in the ‘Power Up Done’ state triggers a power down sequence. During a power up sequence, the state machine enables each power supply in turn. The supply output voltage is monitored to determine if it rises above the UV threshold level within a user defined duration called the blanking time. If a supply rises above the UV threshold then the next enable output in the sequence is turned on. In addition to the blanking time a user may also define sequencing time delays between each enable output turning on. When all four enable outputs are on, and the four VINx pins are above their UV trip points the power up sequence is complete. The ADM1186-1 provides an open drain pin, SEQ_DONE, that is asserted high to provide an indication that an up sequence is complete. The SEQ_DONE pins is allows multiple cascaded ADM1186-1 devices to be perform controlled power up and down sequences. During a power down sequence the enable outputs turn off in reverse order. The sequence time delays between successive supplies the same as during the power up sequence, and no blanking time is used during a power down sequence. At the end of a down sequence the SEQ_DONE pin is brought low. During sequencing and when powered up, the state machine continuously monitors for any fault conditions. Faults include a UV condition on any of the inputs, or an unexpected control input. Any fault that occurs causes the state machine to enter a fault handler. This immediately turns off all enable outputs, and ensures that the device is ready to start a new up sequence. The ADM1186-1 has a bi-directional open drain pin, FAULT, that facilitates fault handling when using multiple devices. An ADM1186-1 experiencing a fault condition drives the FAULT pin low, causing other connected ADM1186-1devices to enter their own fault handling state.. The ADM1186-1 is available in a 20-lead QSOP package and the ADM1186-2 is available in a 16-lead QSOP package.

FEATURES and BENEFITS

  • Monitors four supplies via 0.8% accurate comparators
  • Digital core supports up and down supply sequencing andmultiple devices may be cascaded (ADM1186-1)
  • Four inputs can be programmed to monitor different voltagelevels with resistor dividers
  • Powered from 2.7 V to 5.5 V on the VCC pin
  • Supply sequencing time delays and a timeout delay to 5%accuracy
  • Four open-drain enable outputs
  • Open-drain power-good output
  • Open-drain sequence complete and bi-directional open-drainFault pin (ADM1186-1)

Typical Application Circuit

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Price, packaging, availability

ADM1186 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADM1186-1ARQZ Status: Production 20 ld QSOP 20 Ind Tube, 56 $2.05 $1.99 Y  Material Info PCN Purchase Sample
ADM1186-1ARQZ-REEL Status: Production 20 ld QSOP 20 Ind Reel, 2500 - $1.99 Y  Material Info PCN Purchase
ADM1186-2ARQZ Status: Production 16 ld QSOP 16 Ind Tube, 98 $1.55 $1.49 Y  Material Info PCN Purchase Sample
ADM1186-2ARQZ-REEL Status: Production 16 ld QSOP 16 Ind Reel, 2500 - $1.49 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADM1186 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-ADM1186-1EBZ Status: Production Standalone Evaluation kit, with user configurable supplies and control switches $161.92 Yes -
EVAL-ADM1186-1MBZ Status: Production Micro-eval kit suitable for prototyping with users own supplies and system $30.36 Yes -
EVAL-ADM1186-2EBZ Status: Production Standalone Evaluation kit, with user configurable supplies and control switches $161.92 Yes -
EVAL-ADM1186-2MBZ Status: Production Micro-eval kit suitable for prototyping with users own supplies and system $30.36 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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