LTC2954ITS8-2#TRMPBF Linear Technology, LTC2954ITS8-2#TRMPBF Datasheet - Page 13

• Manufacturer Part Number: LTC2954ITS8-2#TRMPBF
• Description: IC PB ON/OFF CONTROLLER TSOT23-8
• Manufacturer: Linear Technology

Specifications of LTC2954ITS8-2#TRMPBF

• Applications: Push Button, On/Off Controller
• Voltage - Supply: 2.7 V ~ 26.4 V
• Current - Supply: 6µA
• Operating Temperature: -40°C ~ 85°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: LTC2954ITS8-2#TRMPBFTR

TYPICAL APPLICATIONS
width detected is 30μs. If there are glitches on the resis-
tor pull-up voltage that are wider than 30μs and transition
below 0.6V, then an appropriate bypass capacitor should
be connected to the KILL pin. The optional C
capacitor extends the length of time (beyond 64ms) that
the PB input must be held low before releasing the enable
output.
High Voltage PowerPath Switching
The high voltage EN open drain output of the LTC2954-2
is designed to switch on/off an external power PFET. This
allows a user to connect/disconnect a power supply (or
battery) to its load by toggling the PB pin. Figure 7 shows
the LTC2954-2 controlling a two cell Li-Ion battery ap-
plication. The KILL pin is connected to the output of the
Li-Ion BATTERY
Li-Ion BATTERY
SINGLE CELL
SINGLE CELL
4.2V
4.2V
PARASITICS
+
+
CERAMIC
Figure 7. PowerPath Control with 6V Undervoltage Detect
0.1μF
C4
NOISE
INDUCTANCE
CAPACITANCE
TRACE
TRACE
V
GND ONT
PB
PDT
IN
Figure 8. Noisy PB Trace
external
LTC2954-2
C
0.033μF
R5
100k
ONT
5.1k
0.1μF
R6
C5
*
KILL
PDT
INT
EN
V
PFET through a resistive divider. The KILL pin serves as
a voltage monitor. When V
KILL voltage below V
circuit 30μs later. Since the PDT pin is open-circuited, the
power-down debounce time defaults to 64ms.
PB Pin in a Noisy Environment
The rugged PB pin is designed to operate in noisy environ-
ments. Transients below ground (>–6V) and above V
(<33V) will not damage the rugged PB pin. Additionally,
the PB pin can withstand ESD HBM strikes up to ±10kV.
In order to keep external noise from coupling inside the
LTC2954, place an R-C network close to the PB pin. A 5.1k
resistor and a 0.1μF capacitor should suffice for most noisy
applications (see Figure 8).
IN
V
TH
= 0.6V INPUT
GND
R9
100k
V
PB
IN
M1
*OPTIONAL
DETAILS OMITTED
FOR CLARITY
LTC2954-1
ONT
100k
1%
R4
KILL
PDT
INT
EN
KILL(TH)
R1
909k
1%
OPTIONAL GLITCH
FILTER CAPACITOR
2954 F08
V
OUT
V
OUT
,TRIP POINT = 6V
OUT
, the EN pin becomes an open
C3*
0.1μF
2954 F07
drops below 6V, causing a
LTC2954
13
2954fb
IN