Power supply control IC reduces standby power consumption

In recent years, regulations on standby power have become stricter mainly in the EU. Small battery - operated devices such as portable devices and sensor terminals need to be powered on and off in order to use energy efficiently.

This can be easily achieved by using LTC2955.

The LTC2955 is a push button ON/OFF controller that manages and controls 1.5 V to 36 V power supply depending on the connection state of push buttons and power supply.

The functionality of LTC2955 is not limited to the standard push - button controls that push buttons to power up.

It can also be controlled to automatically turn on system power when power is supplied from the main or auxiliary power supply and to power down the system when a push button is pressed.

In addition, it is possible to protect the battery by automatically powering down to the current consumption of 1.2μA by monitoring the software shutdown and the lowering of the power supply voltage with the timer by non - operation state monitoring.

It works in stand - alone mode, so no software is required. With LTC2955, you can easily add power - on and power - off features commonly used on mobile devices.

The LTC2955 has a wide range of operating ranges from 1.5 V to 36 V, so it can be used for a wide variety of battery and battery voltage applications, from portable devices and sensor terminals to automotive electronics, including 1.8 V to 2.8 V battery voltage like SLB.

The following diagram shows the configuration of LTC2955.

Automatic on / off combination can be selected using the mode selection pin.

The LTC2955 has power good output, interrupt output and kill input for easy interfacing with the microprocessor, allowing the off timer to set the duration of the push button even for non - interrupt capable microprocessors.

LTC2955 Key Features :

• Automatic Turn-On Via Voltage Monitor Input
• Wide input power supply range : 1.5 V to 36 V
• Low current consumption : 1.2 μ A
• Push button with less bounce (/ PB) Input
• ±25kV ESD HBM on PB Input
• DC/DC converter can be controlled with low leakage EN output (LTC2955-1)
• High Voltage EN Output Drives External P-Channel MOSFET (LTC2955-2) 
• Microprocessor control with simple interface
• Adjustable Turn-Off timer
• 10 - lead 3 mm x 2 mm DFN and 8 - lead ThinSOT (TM) packages

The operation of LTC2955 is illustrated below.

In addition to the LTC2955, there is also an LTC2952 with ideal diode PowerPath that provides low - loss, automatic switching when two input sources are present, for more control.

The following diagram shows the configuration of LTC2952.