LTC2960 datasheet(13/18 Pages) LINER

13 / 18 page

LTC2960

2960fa

For more information www.linear.com/LTC2960

Typical applicaTions

Figure 8. Configurable Regulator UVLO and Low Battery Indicator

Configurable Regulator UVLO and Low Battery

Indicator

In the circuit of Figure 8, the high voltage open drain

OUT output is used as a configurable UVLO signal for a

switching regulator. A Li-Ion battery can contain protec-

tion circuitry that open circuits its terminals through an

internal switch when it reaches 2.5V. With a threshold of

5.537V the LTC2960 OUT output disables the load before

this occurs in order to prevent damage to the batteries.

In addition to the UVLO signal, the LTC2960 provides a

low battery indicator for the system. Figure 9 shows an

alternative arrangement in which the LTC2960 monitors

the output of the 3.3V regulator to provide a reset signal.

LTC2960-1

LT3991

VIN

VCC

GND

VOUT

ADJ

GND

IN+

RST

OUT

5.11M*

Li-Ion

4.2V

Li-Ion

4.2V

49.9k

VBAT

6V TO 8.4V

VOUT

3.3V

0.1µF

25V

348k

LOW BATTERY

10M

2960 F08

47µF

16V

UVLO FALLING THRESHOLD = 5.537V

RESET FALLING THRESHOLD = 6.33V

NOT ALL LT3991 COMPONENTS SHOWN

BUCK CONVERTER

*VISHAY-DALE CRCW SERIES 0603 1%

Figure 9. Configurable Regulator UVLO and Supervisor

LTC2960-1

LT3991

VIN

VCC

GND

VOUT

IN+

GND

ADJ

RST

OUT

6.04M

Li-Ion

4.2V

Li-Ion

4.2V

VBAT

6V TO 8.4V

VOUT

3.3V

0.1µF

25V

402k

RESD*

10k

RESET

2.26M

402k

10M

2960 F09

UVLO FALLING THRESHOLD = 6.410V

RESET FALLING THRESHOLD = 2.649V

*OPTIONAL RESISTOR FOR ADDED ESD PROTECTION

47µF

16V

NOT ALL LT3991 COMPONENTS SHOWN

BUCK CONVERTER

LTC2960 Datasheet(PDF) 13 Page - Linear Technology

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