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參數(shù)資料
| 型號： | LTC2951IDDB-1#TRMPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WEED-1, DFN-8 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 213K |
| 代理商： | LTC2951IDDB-1#TRMPBF |
LTC2951-1/LTC2951-2
12
295112fa
High Voltage Pins
The VIN and PB pins can operate at voltages up to 26.4V.
PB can, additionally, operate below ground (–6V) without
latching up the device. PB has an ESD HBM rating of ±10kV.
If the push button switch connected to PB exhibits high
leakage current, then an external pull-up resistor to VIN is
recommended. Furthermore, if the push button switch is
physically located far from the LTC2951 PB pin, parasitic
capacitances may couple onto the high impedance PB
input. Additionally, parasitic series inductance may cause
unpredictable ringing at the PB pin. Placing a 5k resistor
from the PB pin to the push button switch would mitigate
parasitic inductance problems. Placing a 0.1F capacitor
on the PB pin would lessen the impact of parasitic capaci-
tive coupling.
Voltage Monitoring with KILL Input
The KILL pin can be used as a voltage monitor. Figure
5 shows an application where the KILL pin has a dual
function. It is driven by a low leakage open drain output
of the P. It is also connected to a resistor divider that
monitors battery voltage (VIN). When the battery voltage
falls below the set value, the voltage at the KILL pin falls
below 0.6V and the EN pin is quickly pulled low. Note that
the resistor values should be as large as possible, but
small enough to keep leakage currents from tripping the
0.6V KILL comparator.
The DC/DC converter shown has an internal pull-up cur-
rent on its SHDN pin. A pull-up resistor on EN is thus not
needed.
Operation Without P
Figure 6 shows how to connect the KILL pin when there
is no circuitry available to drive it. The minimum pulse
width detected is 30s. If there are glitches on the resis-
tor pull-up voltage that are wider than 30s and transition
below 0.6V, then an appropriate bypass capacitor should
be connected to the KILL pin.
Figure 5. Input Voltage Monitoring with KILL Input
Figure 6. No P Application
PB
VIN
SHDN
VIN
VOUT
EN
INT
KILL
INT
KILL
(OPEN DRAIN)
LTC2951-1
GND
OFFT
LT1767-3.3
P
9V
R1
10k
3.3V
2951 F05
C4
0.1
F
R3
806k
1%
R2
100k
1%
5.4V THRESHOLD
*OPTIONAL
VIN
CKILLT*
0.033
F
COFFT*
0.033
F
KILLT
VIN
SHDN
VIN
VOUT
LT1767-3.3
9V
3.3V
R1
100k
C3*
0.01
F
2951 F06
+
C4
0.1
F
*OPTIONAL
PB
EN
INT
KILL
LTC2951-1
GND KILLT
OFFT
VIN
CKILLT*
0.033
F
COFFT*
0.033
F
APPLICATIO S I FOR ATIO
WU
U
TYPICAL APPLICATIO S
U
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