LTC2907 LINER [Linear Technology], LTC2907 Datasheet - Page 14

• Manufacturer Part Number: LTC2907
• Description: 36V Nano-Current Two Input Voltage Monitor
• Manufacturer: LINER [Linear Technology]

LTC2960
TYPICAL APPLICATIONS
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 V
condition. When the battery stack voltage is above the
IN
on. The LTC2960-2 also supervises V
battery signal as an early warning of impending shutdown.
A 10k resistor is included in series with the V
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
low voltage supervisor capable of operating in temperatures
up to 125°C in automotive environments. The LT4356 surge
stopper limits V
condition. The LT3991 buck regulator in conjunction with
the LTC2960 draw <10μA quiescent current for no load,
which limits the drain on the vehicle battery even after
long periods of inactivity.
Window Comparator for High Voltage Input
The LTC2960-4 can be configured as a window compara-
tor to monitor high voltage supplies or battery stacks as
shown in Figure 12. A fault signal is generated if V
of regulation. The OUT output of the LTC2960-4 is fed back
into the MR input to drive the RST output. A micropower
LDO provides bias to the active pull-up DV
low static current draw in the outputs.
14
–
rising threshold of 5.972V, the PMOS switch is turned
IN
to 27V under the alternator load dump
OUT
in the event of an undervoltage
OUT
to provide a low
CC
CC
pin to limit
supply for
IN
is out
16.4V
Micropower Power Supply Sequencer and Supervisor
Figure 13 illustrates multiple uses for the LTC2960 in a
power supply system. U1 is a power supply sequencer
whose IN
ing regulator. The ADJ input monitors the output of the
5V switching regulator and enables the 1.8V LDO after a
16ms Reset Timeout Period. U2 is a supervisor monitor-
ing the 5V and 1.8V outputs. The OUT output by virtue
of the MR pin, keeps the RST output low until the 1.8V
supply is ready.
V
IN
Figure 12. Window Comparator for High Voltage Input
UPPER THRESHOLD = 16.897V
LOWER THRESHOLD = 12.3V
C1
0.1μF
50V
+
input monitors V
R3B
118k*
R3A
7.32M*
R2
68k*
R1
182k*
ADJ
IN
LTC2960-4
–
GND MR
V
CC
DV
R4
10k
OUT
2960 F12
RST
CC
IN
V
SHDN
*VISHAY-DALE CRCW SERIES 0603 1%
IN
FAULT
and enables the 5V switch-
LT3009-5
GND
OUT
C2
1μF
16V
V
5V
20mA MAX
OUT
2960f