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LM3881MME Datasheet(PDF) 1 Page - Texas Instruments |
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LM3881MME Datasheet(HTML) 1 Page - Texas Instruments |
1 / 17 page Input Supply (2.7 V ± 5.5V) VCC LM3881 FLAG1 GND CADJ EN FLAG3 FLAG2 INV TADJ Flag1 Flag2 Flag3 VCC LM3881 FLAG2 GND EN TADJ FLAG1 FLAG3 INV 1 2 4 3 6 7 8 5 LM3881 www.ti.com SNVS555C – JANUARY 2008 – REVISED APRIL 2013 LM3881 Power Sequencer Check for Samples: LM3881 1 FEATURES DESCRIPTION The LM3881 Power Sequencer offers the easiest 2 • Easiest Method to Sequence Rails method to control power up and power down of • Power Up and Power Down Control multiple power supplies (switching or linear • Input Voltage Range of 2.7V to 5.5V regulators). By staggering the startup sequence, it is possible to avoid latch conditions or large in-rush • Small Footprint VSSOP-8 Package currents that can affect the reliability of the system. • Low Quiescent Current of 80 µA Available in VSSOP-8 package, the Power • Output Invert Feature Sequencer contains a precision enable pin and three • Timing Controlled by Small Value External open drain output flags. Upon enabling the LM3881, Capacitor the three output flags will sequentially release, after individual time delays, permitting the connected APPLICATIONS power supplies to startup. The output flags will follow a reverse sequence during power down to avoid latch • Multiple Supply Sequencing conditions. Time delays are defined using an external • Microprocessor / Microcontroller Sequencing capacitor and the output flag states can be inverted • FPGA Sequencing by the user. Typical Application Circuit Connection Diagram Figure 1. Top View VSSOP-8 Package PIN DESCRIPTIONS Pin # Name Function 1 VCC Input Supply 2 EN Precision Enable 3 GND Ground 4 INV Output Logic Invert 5 TADJ Timer Adjust 6 FLAG3 Open Drain Output #3 7 FLAG2 Open Drain Output #2 8 FLAG1 Open Drain Output #1 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2008–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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