LTC1041

1

1041fa

s

Micropower 1.5

µW (1 Sample/Second)

s

Wide Supply Range 2.8V to 16V

s

High Accuracy

Guaranteed SET POINT Error

±0.5mV Max

Guaranteed Deadband

±0.1% of Value Max

s

s

TTL Outputs with 5V Supply

s

Two

Independent Ground-Referred Control Inputs

s

Small Size 8-Pin SO

The LTC

controller manufactured using Linear Technology’s

enhanced LTCMOS™ silicon gate process. BANG-BANG

loops are characterized by turning the control element

fully ON or fully OFF to regulate the average value of

the parameter to be controlled. The SET POINT input

determines the average control value and the DELTA input

sets the deadband. The deadband is always 2 x DELTA and

is centered around the SET POINT. Independent control

of the SET POINT and deadband, with no interaction, is

made possible by the unique sampling input structure of

the LTC1041.

An external RC connected to the OSC pin sets the sampling

rate. At the start of each sample, internal power to the

analog section is switched on for

≈ 80µs. During this time,

the analog inputs are sampled and compared. After the

comparison is complete, power is switched off. This

achieves extremely low average power consumption

at low sampling rates. CMOS logic holds the output

continuously while consuming virtually no power.

To keep system power at an absolute minimum, a switched

bridge networks and resistive dividers, can be driven by

this switched output.

inputs. This has no other effect on the operation of

the LTC1041.

BANG-BANG Controller

, LTC and LT are registered trademarks of Linear Technology Corporation.

FEATURES

APPLICATIO S

DESCRIPTIO

s

Temperature Control (Thermostats)

s

Motor Speed Control

s

Battery Charger

s

Any ON-OFF Control Loop

LTCMOS is a trademark of Linear Technology Corporation.

Ultralow Power 50

°F to 100°F (2.4µW) Thermostat

Supply Current vs Sampling Frequency

TYPICAL APPLICATIO

1N4002

(4)

0.1

µF

26V AC 2-WIRE THERMOSTAT

4.32k

5k

6.81k

49.9

Ω

ALL RESISTORS 1%.

YELLOW SPRINGS INSTRUMENT CO., INC. P/N 44007.

4.99k

1

µF

6V

+

10M

LTC1041 • TA01

56

Ω

400nA

8

7

6

5

1

2

3

4

DELTA = 0.5

°F

2N6660

†

†

LTC1041

0.1

0.01

0.1

1

10

100

1000

10000

1

10

100

1000

LTC1041 • TA02

10000

TOTAL SUPPLY

CURRENT

LTC1041 SUPPLY

CURRENT