LTC2960

14

2960f

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-

condition. When the battery stack voltage is above the

battery signal as an early warning of impending shutdown.

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

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

of regulation. The OUT output of the LTC2960-4 is fed back

into the MR input to drive the RST output. A micropower

low static current draw in the outputs.

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

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.

LT3009-5

GND

OUT

SHDN

LTC2960-4

GND MR

ADJ

RST

OUT

R3A

7.32M*

R3B

118k*

R4

10k

R2

68k*

16.4V

5V

20mA MAX

C1

0.1μF

50V

R1

182k*

FAULT

2960 F12

C2

1μF

16V

UPPER THRESHOLD = 16.897V

LOWER THRESHOLD = 12.3V

*VISHAY-DALE CRCW SERIES 0603 1%

Figure 12. Window Comparator for High Voltage Input