LTC2955CDDB-1#TRMPBF Product Information

Overview

The LTC2955CDDB-1#TRMPBF is a micropower pushbutton on/off controller designed to manage system power by generating a clean enable output from the supply monitor input and the debounced pushbutton input. It features an interrupt output that notifies the system of a pushbutton or low supply event. This model is ideal for applications requiring precise control over power states, such as desktop and notebook computers, GPS devices, portable instruments, and automotive electronics.

Features

• Automatic Turn-On via Voltage Monitor Input
• Wide Input Supply Range: 1.5V to 36V
• Low Supply Current: 1.2μA
• ±25kV ESD HBM on PB Input
• ±36V Wide Input Voltage for PB Input
• Low Leakage EN Output Allows DC/DC Converter Control (LTC2955-1)
• High Voltage EN Output Drives External P-Channel MOSFET (LTC2955-2)
• Simple Interface Allows Graceful μP Shutdown
• Adjustable Turn-Off Timer
• 10-Lead 3mm × 2mm DFN and 8-Lead ThinSOT Packages

Applications

• Desktop and Notebook Computers
• GPS Devices
• Portable Instruments
• Automotive Electronics

Ordering Information

• Part Number: LTC2955CDDB-1#TRMPBF
• Package Type: 10-Lead Plastic DFN (3mm × 2mm)
• Temperature Range: 0°C to 70°C
• Lead Free Finish: Yes
• Tape and Reel (Mini): Available

Pin Configuration

• INT: Interrupt Output
• ON: Monitor Input
• PGD: ON Status Output (DFN only)
• KILL: Kill Input
• EN/EN: Enable Output (LTC2955-1) / Inverted Enable Output (LTC2955-2)
• TMR: Timer Pin
• SEL: Mode Select Input (DFN only)
• VIN: Power Supply Input
• PB: Pushbutton Input
• GND: Device Ground
• Exposed Pad (DFN only): Leave open or connect to device ground

Electrical Characteristics

• Supply Voltage Range (VIN): 1.5V to 36V
• Supply Current (IN): 0.5μA to 1.2μA (typical)
• Undervoltage Lockout (VUVL): 1.0V to 1.3V
• Undervoltage Lockout Hysteresis (VUVL(HYST)): 30mV to 200mV
• PB Input Threshold (VPB): 0.6V to 1.0V
• PB Input Threshold Hysteresis (VPB(HYST)): 40mV
• PB Open Circuit Voltage (VPB(VOC)): 3.0V to 5.5V
• PB Input Leakage Current (IPB): ±10μA to ±400μA
• ON Threshold (VON): 0.76V to 0.84V
• ON Hysteresis (VON(HYST)): 40mV (DFN Package Only)
• ON Input Leakage Current (ION): ±10nA to ±100nA
• KILL Input Threshold Voltage (VKILL): 0.76V to 0.84V
• KILL Input Threshold Hysteresis (VKILL(HYST)): 30mV
• KILL Input Leakage Current (IKILL): ±50nA
• SEL Input Threshold (VSEL): 0.4V to 1.2V
• SEL Input Current (ISEL): ±50nA to ±100nA
• EN/EN Voltage Output Low (VEN/EN(VOL)): 0.175V to 0.4V
• EN Voltage Output High (VEN(VOH)): 1.5V to 5.5V (LTC2955-1) / VIN - 1.5V (LTC2955-2)
• EN Pull-Up Current (LTC2955-1): -1.2μA to -2.8μA
• EN Pull-Up Resistance (LTC2955-2): 0.45MΩ to 1.35MΩ
• INT Voltage Output Low (VINT(VOL)): 0.4V
• INT Leakage Current (INT): ±50nA
• PGD Voltage Output High (VPGD(VOH)): 1.5V to 5.5V
• PGD Pull-Up Current (IPGD): -1.2μA to -2.8μA
• TMR Pull-Up Current (ITMR(PU)): -2μA to -4μA
• TMR Pull-Down Current (ITMR(PD)): 2μA to 4μA

Absolute Maximum Ratings

• VIN Input Voltages: -0.3V to 40V
• PB Input Voltages: -40V to 40V
• SEL, KILL, EN/EN, INT, PGD Input Voltages: -0.3V to 40V
• Operating Temperature Range (LTC2955C): 0°C to 70°C
• Storage Temperature Range: -65°C to 150°C
• Lead Temperature (Soldering, 10 sec): 300°C

Package Description

• 10-Lead Plastic DFN (3mm × 2mm): Exposed pad for thermal performance and optional PCB ground connection.
• 8-Lead ThinSOT Package: Suitable for space-constrained applications.

Applications Information

• Adjusting the Forced Turn-Off Timing: Use an external capacitor on the TMR pin to adjust the turn-off debounce time.
• Voltage Monitoring with KILL Input: The KILL pin can be used as a voltage monitor input to shut down the regulator when its output voltage drops below a certain level.
• Operation Without μP: The KILL pin can be connected to a voltage regulator output through a resistive divider or RC network.
• Enhancing VIN Ruggedness: Use a 1k resistor and a 10nF capacitor at the VIN pin to enhance ruggedness against reverse-input voltages and high voltage input transients.
• Applications with Slide Switch: Use a slide switch to prevent accidental toggling of the system power.
• Interface with Switching Regulators: The LTC2955-1 EN pin can be connected directly to most switching regulator SHUTDOWN inputs.