LTC2951ITS8-1#PBF Linear Technology, LTC2951ITS8-1#PBF Datasheet - Page 15

• Manufacturer Part Number: LTC2951ITS8-1#PBF
• Manufacturer: Linear Technology

Specifications of LTC2951ITS8-1#PBF

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 8
• Mounting: Surface Mount
• Package Type: TSOT-23
• Case Length: 2.9mm
• Screening Level: Industrial
• Lead Free Status / Rohs Status: Compliant

TYPICAL APPLICATIONS
PowerPath
The EN open-drain output of the LTC2951-2 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
LTC2951-2 controlling a two cell Li-Ion battery application.
The INT and KILL pins are connected to the output of the
PFET through a resistor divider. The KILL pin serves as a
voltage monitor. When V
is open-circuited 30µs later.
TM
Switching
Li-Ion BATTERY
Li-Ion BATTERY
SINGLE-CELL
SINGLE-CELL
OUT
4.2V
4.2V
drops below 6V, the EN pin
+
+
PARASITICS
Figure 7. PowerPath Control with 6V Undervoltage Detect
NOISE
INDUCTANCE
C4
0.1µF
CERAMIC
CAPACITANCE
TRACE
TRACE
Figure 8. Filtering for Noisy PB Traces
V
PB
GND
IN
KILLT
LTC2951-2
5.1k
R6
C
0.033µF
R5
100k
KILLT
*
OFFT
C5
0.1µF
KILL
V
INT
PB Pin in a Noisy Environment
The rugged PB pin is designed to operate in noisy envi-
ronments. 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
LTC2951, place an RC network close to the PB pin. A 5k
resistor and a 0.1µF capacitor should suffice for most
noisy applications (see Figure 8).
EN
IN
C
0.033µF
OPEN-DRAIN OUTPUT
V
OFFT
V
PB
TH
GND
IN
= 0.6V INPUT
*
DETAILS OMITTED
*OPTIONAL
M1
FOR CLARITY
LTC2951-1
KILLT
LTC2951-1/LTC2951-2
OFFT
KILL
100k
INT
1%
R4
EN
2951 F08
R1
909k
1%
OPTIONAL GLITCH
FILTER CAPACITOR
V
OUT
V
OUT
, TRIP POINT = 6V
C3*
0.1µF
2951 F07
15
295112fb
IN