ISL8723

Power Sequencing Controllers

Product Status: Mass Production

OVERVIEW

The Intersil ISL8723 and ISL8724 are 4 channel sequencers controlling the on and off sequence of voltages with undervoltage supply fault protection and a "sequence completed" signal (RESET ). For larger systems, more than 4 voltages can be sequenced by a simple connection of multiple IC's. These sequencers use an integrated charge pump to drive 4 external low-cost N-channel MOSFET switch gates above the IC bias voltage by 5.3V. These IC's can be biased from and control any supply from 2.5V to 5V and additionally monitor any voltage above 0.7V. Individual product descriptions follow.

The four channel ISL8723 (ENABLE input), ISL8724 (ENABLE input) offer the designer 4 voltage control when it is required that all four rails are in minimal compliance prior to turn on and that compliance must be maintained during operation. The ISL8723 has a low power standby mode when it is disabled suitable for battery powered applications.

External resistors provide flexible voltage threshold programming of monitored voltages. Delay and sequencing timing are programmable by external capacitors for both ramp up and ramp down.

KEY FEATURES

  • Enables arbitrary turn-on and turn-off sequencing of up to four power supplies (0.7V to 5V)
  • Operates from 2.5V to 5V supply voltage
  • Supplies VDD +5.3V of charge pumped gate drive
  • Adjustable voltage slew rate for each rail
  • Multiple sequencers can be easily daisy-chained to sequence an infinite number of independent voltages
  • Glitch immunity
  • Undervoltage lockout for each monitored supply voltage
  • 30µA Sleep State (ISL8723)
  • Active high (ISL8723) or low (ISL8724) ENABLE input
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL8723
Basic Information
生产状态
Mass Production
VBIAS (最小值)
2.5 V
VBIAS (最大值) (V)
5.5
序列电压 (最小值)
0.7 V
序列电压 (最大值)
5.5 V
启用
Active High
逻辑电平
TTL
初始启动要求
4 UVLO 1EN
监控输入
4
序列输出控制
Charge Pumped 10μA FET Drive
当VIN不符合标准时,关闭的通道数量
4 Gates
预设或可调序列
Adjustable ON & OFF Delay
特性
Auto Restart, Low bias current sleep
掉电序列
Yes
资质级别
Standard
序列电压范围 (V)
0.7 to 5.5
偏置电压范围 (V)
2.5 to 5.5
CAN 采样
YES
温度范围
-40 to +85

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