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LTC2960 Datasheet(PDF) 14 Page - Linear Technology

Part # LTC2960
Description  36V Nano-Current Two-Input Voltage Monitor
PDF  18 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2960 Datasheet(HTML) 14 Page - Linear Technology

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LTC2960
14
2960fa
For more information www.linear.com/LTC2960
Typical applicaTions
Figure 10. Battery Disconnect to Protect Against Deep Discharge
Figure 11. Automotive Supervisor
LTC2960-2
VCC
IN–
RT
GND
MR
ADJ
RST
OUT
R2
5.6M*
Li-Ion
4.2V
Li-Ion
4.2V
VBAT
6V TO 8.4V
M1
Si4435
M2
Si4435
VOUT
C1
0.1µF
25V
R1
402k*
LOW BATTERY
R5
10M
R4
6.04M*
R3
402k*
R6
100k
R7
1M
1N5245
15V
2960 F10
IN– FALLING THRESHOLD = 5.974V
ADJ FALLING THRESHOLD = 6.410V
+
+
R8
10k
*VISHAY-DALE CRCW SERIES 0603 1 %
LTC2960-3
VCC
IN+
GND
MR
OUT
ADJ
RST
DVCC
R2
825k
R7
1M
VIN
4V TO 27V
12V
VEHICLE BATTERY
IRLR2908
VOUT
3.3V
C1
1µF
50V
R1
80.6k
UV
OV
R6
6.04M
R5
1M
R8
102k
R7
4.99k
R4
1.78M
R3
1M
2960 F11
C2
22µF
25V
IN+ FALLING THRESHOLD = 4.49V
ADJ FALLING THRESHOLD = 2.816V
LT3991
BUCK CONVERTER
VIN
GND
VOUT
FB
EN/SS
LT4356
VCC
GND
GATE OUT
FLT
FB
NOT ALL LT3991 COMPONENTS SHOWN
The LTC2960-2 in Figure 10 is yet another way to prevent
excessive discharge of a battery. The high voltage OUT
output is used to drive the gate of a PMOS switch to in-
terrupt the path to VOUT in the event of an undervoltage
condition. When the battery stack voltage is above the
IN– rising threshold of 5.972V, the PMOS switch is turned
on. The LTC2960-2 also supervises VOUT to provide a low
battery signal as an early warning of impending shutdown.
A 10k resistor is included in series with the VCC pin to limit
current in the event of a reverse battery condition. In all
three examples, the load drops to <2.5µA typically and
excessive battery drain is prevented.
Automotive Supervisor (LTC2960 H-Grade)
The circuit in Figure 11 uses the LTC2960-3 (H-grade) as a
lowvoltagesupervisorcapableofoperatingintemperatures
up to 125°C in automotive environments. The LT4356
surge stopper limits VIN to 27V under the alternator load



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