ES1022SI datasheet(5/14 Pages) ALTERA

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Enpirion Power Datasheet ES1022SI Adjustable Quad Sequencer

May 2014

Altera Corporation

Functional Block Diagram

Functional Description

ES1022SI provides four delay adjustable sequenced outputs while monitoring a single distributed voltage in the nominal

range of 3.3V to 24V for both under and overvoltage. Only when the voltage is in compliance will the ES1022SI initiate the

pre-programmed A-B-C-D sequence of the EN outputs. Although this IC has a bias range of 3.3V to 24V it can monitor any

voltage >1.22V via the external divider if a suitable bias voltage is otherwise provided.

During initial bias voltage (VIN) application the ES1022SI EN outputs are held low once VIN =1V. Once VIN > the V bias

power on reset threshold (POR) of 2.8V, VIN is constantly monitored for compliance via the input voltage resistor divider

and the voltages on the UV and OV pins and reported by the FAULT output. Internally, voltage regulators generate 3.5V

and 1.17V ±5% voltage rails for internal usage once VIN > POR. Once UV > 1.22V and with the SEQ_EN pin high or open,

the auto sequence of the four EN outputs begins as the TIME pin charges its external capacitor with a 2.6µA current source.

The voltage on TIME is compared to the internal reference (VTIME_VTH) comparator input and when greater than VTIME_VTH

the EN_A is released to go high via an external pull-up resistor or a pull-up in a DC/DC convertor EN input, for example.

The time delay generated by the external capacitor is to assure continued voltage compliance within the programmed

limits, as during this time any OV or UV condition will halt the start-up process. TIME cap is discharged once VTIME_VTH is

met.

BIAS

IC Supply Current

IVIN_3.3V

VIN = 3.3V

191

μA

IVIN_12V

VIN = 12V

246

400

μA

IVIN_24V

VIN = 24V

286

μA

VIN Power On Reset

VIN_POR

VIN low to high

2.3

2.8

Electrical Specifications

Nominal VIN = 3.3V to +24V, TA = TJ = -40°C to+85°C, Unless Otherwise Specified. (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIN

VOLTAGE

1.17V

INTERNAL VOLTAGE

REGULATOR

VIN (2.8V MIN - 27V MAX)

2.0V VIN POR

3.5V

LOGIC

VIN

PROGRAMMABLE

DELAY TIMER

VTIME_VTH

2.6

μA

VIN

TDLY_AB TDLY_BC TDLY_CD

EN_A

EN_B

EN_C

EN_D

TIME

GND

FAULT

SEQ_EN

VREF

μs

REFERENCE

10037

May 28, 2014

Rev A

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