LTC2904/LTC2905

1

29045fd

TYPICAL APPLICATION

DESCRIPTION

Precision Dual Supply

Monitors with Pin-Selectable

Thresholds

tended for systems with two supply voltages. The dual

supply monitors have a common reset output with delay

(200ms for the LTC2904 and adjustable using an exter-

nal capacitor for the LTC2905). This product provides a

precise, space-conscious and micropower solution for

supply monitoring.

The LTC2904/LTC2905 feature a tight 1.5% threshold

accuracy over the whole operating temperature range, and

glitch immunity to ensure reliable reset operation without

false triggering. The open drain RST output is guaranteed

to be in the correct state for inputs down to 1V.

The LTC2904/LTC2905 also feature three programming

input pins, which program the threshold and tolerance level

without requiring any external components. These three

programming pins provide a total of 27 different voltage

level and tolerance combinations, eliminating the need to

have different parts for development and implementation

of different systems with different voltage levels requiring

monitoring function.

5V, 3.3V Dual Supply Monitor with 5% Tolerance

FEATURES

APPLICATIONS

±1.5% of

Monitored Voltage Over Temperature

Plastic (3mm

× 2mm) DFN Packages

Table 1. Voltage Threshold Programming

V1

V2

S1

S2

5.0

3.3

V1

V1

3.3

2.5

Open

GND

3.3

1.8

V1

Open

3.3

1.5

Open

V1

3.3

1.2

Open

Open

2.5

1.8

GND

GND

2.5

1.5

GND

Open

2.5

1.2

GND

V1

2.5

1.0

V1

GND

V1

S1

S2

TOL

V2

TMR

GND

RST

LTC2905

22nF

0.1μF

0.1μF

DC/DC

CONVERTER

SYSTEM

LOGIC

29045 TA01

3.3V

5V

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Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.