SGM822 Datasheet | SG Micro

DESCRIPTION The SGM822 is an integrated, 3-rail power sequencer. It controls the power-up and power-down sequence of three power supplies by pulling their enable or shutdown pins high or low. Staggered start sequence can avoid the impact of latch conditions or large inrush current on system reliability. This simple sequencer has three open-drain output flags. When the enable (EN) pin is pulled high, the flags are successively released from FLAG1 to FLAG3 after individual programmable delay time. Then the connected power supplies power up. When the EN pin is pulled low, the flags output low with a reverse sequence from FLAG3 to FLAG1 after individual programmable delay time. The delay time is programmed by connecting a capacitor between the TADJ pin and ground. The logic of the output flags can be inverted by the user. The SGM822 is available in Green MSOP-8 and UTDFN-1.5×1.5-8L packages. It operates over an ambient temperature range of -40℃ to +125℃. FEATURES - Up to 3-Rail Power Sequence Control - Low Quiescent Current: 36μA (TYP) - Input Voltage Range: 2.7V to 5.5V - Pin-Selected Flag Output Logic - Capacitor-Programmable Power-Up/Power-Down Sequencing Delay - Available in Green MSOP-8 and UTDFN-1.5×1.5-8L Packages APPLICATIONS Multivoltage Systems Servers Networking Systems Tele Equipment Microprocessor, Microcontroller and FPGA Sequencing Multiple Supply Sequencing TYPICAL SYSTEM APPLICATION Power Supply 0.1µF Enable Invert VCC FLAG1 FLAG2 INV FLAG3 Device 1 EN Device 2 EN Device 3 EN Figure 1. Typical System Application TYPICAL APPLICATION 2.7V to 5.5V Supply Enable Input CADJ 10n F VCC EN FLAG1 FLAG2 TADJ FLAG3 R1 R2 100kΩ...