LTC2960CDC-1 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2960CDC-1' PDF : 16 Pages View PDF
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 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
low voltage supervisor capable of operating in temperatures
up to 125°C in automotive environments. The LT4356 surge
stopper limits VIN to 27V under the alternator load dump
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.
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+ input monitors VIN and enables the 5V switch-
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.
VIN
16.4V
R3B
118k*
R3A
7.32M*
VIN
OUT
R4
LT3009-5
10k SHDN
GND
C1
0.1μF
50V
R2
68k*
VCC
DVCC
ADJ
LTC2960-4
IN– RST
R1
182k*
OUT
GND MR
2960 F12
FAULT
VOUT
5V
C2 20mA MAX
1μF
16V
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 VIN is out
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 DVCC supply for
low static current draw in the outputs.
UPPER THRESHOLD = 16.897V
LOWER THRESHOLD = 12.3V
*VISHAY-DALE CRCW SERIES 0603 1%
Figure 12. Window Comparator for High Voltage Input
2960f
14
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