LTC2954CTS8-1#TRMPBF Linear Technology, LTC2954CTS8-1#TRMPBF Datasheet - Page 6

• Manufacturer Part Number: LTC2954CTS8-1#TRMPBF
• Description: IC PB ON/OFF CONTROLLER TSOT23-8
• Manufacturer: Linear Technology

Specifications of LTC2954CTS8-1#TRMPBF

• Applications: Push Button, On/Off Controller
• Voltage - Supply: 2.7 V ~ 26.4 V
• Current - Supply: 6µA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-8, TSOT-8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Other names: LTC2954CTS8-1#TRMPBFTR

LTC2954
PIN FUNCTIONS
V
PB (Pin 2/Pin 3): Pushbutton Input. Connecting PB to
ground through a momentary switch provides on/off
control via the EN/EN and INT outputs. An internal 100k
pull-up resistor connects to an internal 1.9V bias voltage.
The rugged PB input withstands ±10kV ESD HBM and
can be pulled up to 26.4V externally without consuming
extra current.
ONT (Pin 3/Pin 2): Turn-On Time Input. Placing an external
capacitor to ground determines the additional time (6.4
seconds/μF) the PB pin must be held low before the enable
output is asserted. Floating this pin results in a default
turn on debounce time of 32ms.
GND (Pin 4/Pin 1): Device Ground.
INT (Pin 5/Pin 8): Open Drain Interrupt Output. After a
pushbutton turn-off event is detected (t
interrupts the system (μP) by asserting the INT pin low.
The μP would perform power-down and housekeeping
tasks and then assert the KILL pin low, thus releasing the
enable output. The INT pulse width is a minimum of 32ms
and stays low as long as PB is asserted. If PB is asserted
for longer than t
are immediately released.
EN (LTC2954-1, Pin 6/Pin 7): Open Drain Enable Output.
This pin is intended to enable system power. EN is asserted
high after a valid PB turn-on event (t
released low if: a) KILL is not driven high (by μP) within
512ms of the initial valid PB power turn-on event, b) KILL
is driven low during normal operation, c) PB is pressed
6
IN
(Pin 1/Pin 4): Power Supply Input: 2.7V to 26.4V.
PD,MIN
+ t
PDT
(TSOT-23/DFN)
, the INT and EN/EN outputs
DB,ON
DB,OFF
), the LTC2954
+ t
ONT
). EN is
and held low (t
pin can connect directly to a DC/DC converter shutdown
pin that provides an internal pull-up. Otherwise a pull-up
resistor to an external supply is required. The operating
range for this low leakage pin is 0V to 26.4V.
EN (LTC2954-2, Pin 6/Pin 7): Open Drain Enable Bar
Output. This pin is intended to enable system power. EN is
asserted low after a valid PB turn-on event (t
EN releases high if: a) KILL is not driven high (by μP) within
512ms of the initial valid PB power turn-on event, b) KILL
is driven low during normal operation, c) PB is pressed
and held low (t
pin can connect directly to a DC/DC converter shutdown
pin that provides an internal pull-up. Otherwise a pull-up
resistor to an external supply is required. The operating
range of this pin is 0V to 26.4V.
PDT (Pin 7/Pin 6): Power-Down Time Input. A capacitor
to ground determines the additional time (6.4 seconds/μF)
that the pushbutton must be held low before immediately
releasing the EN/EN and INT outputs. Floating this pin
results in a pushbutton power-down time of 64ms.
KILL (Pin 8/Pin 5): Kill Input. Forcing KILL low releases the
enable output. During system turn-on, this pin is blanked by
a 512ms internal timer (t
to pull KILL high. This pin has an accurate 0.6V threshold
and can be used as a voltage monitor input. If unused,
connect to a low voltage output supply (see Figure 6).
Exposed Pad (Pin 9 DFN Only): Exposed Pad may be left
open or connected to device ground.
PD,MIN
PD,MIN
+ t
+ t
PDT
PDT
KILL,ON BLANK
) during normal operation. This
) during normal operation. This
) to allow the system
DB,ON
+ t
ONT
2954fb
).