TC1043 datasheet(5/20 Pages) MICROCHIP

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DS21347B-page 5

TC1043

3.0

DETAILED DESCRIPTION

The TC1043 is one of a series of very low power, linear

building block products targeted at low voltage, single

supply applications. The TC1043 minimum operating

voltage is 1.8V and typical supply current is only 20

µA

(fully enabled). It combines two comparators, two op

amps and a voltage reference in a single package. A

shutdown mode is incorporated for easy adaptation to

system power management schemes. During shut-

down, all but one comparator and the voltage reference

are disabled (i.e. powered down with their respective

outputs at high impedance). The “still awake” compar-

ator and voltage reference can be used as a wake-up

timer, power supply monitor, LDO controller or other

continuous duty circuit function.

3.1

Comparators

The TC1043 contains two comparators. The compara-

tors input range extends beyond both supply voltages

by 200mV and the outputs will swing to within several

millivolts of the supplies, depending on the load current

being driven.

The comparators exhibit a propagation delay and sup-

ply current which are largely independent of supply

voltage. The low input bias current and offset voltage

make them suitable for high impedance precision appli-

cations.

Comparator CMPTR1 is disabled during shutdown and

has a high impedance output. Comparator CMPTR2

remains active.

3.2

Operational Amplifiers

The TC1043 contains two rail-to-rail op amps. The

amplifiers’ input range extends beyond both supplies

by 200mV and the outputs will swing to within several

millivolts of the supplies depending on the load current

being driven.

The amplifier design is such that large signal gain, slew

rate and bandwidth are largely independent of supply

voltage. The low input bias current and offset voltage of

the TC1043 make it suitable for precision applications.

Both op amps are disabled during shutdown and have

high output impedance.

3.3

Voltage Reference

A 2.0% tolerance, internally biased, 1.20V bandgap

voltage reference is included in the TC1043. It has a

push-pull output capable of sourcing and sinking at

least 50

µA. The voltage reference remains fully

enabled during shutdown.

3.4

Shutdown Input

SHDN at VIL disables both op amps and one compara-

tor. The SHDN input cannot be allowed to float. When

not used, connect it to VDD. The disabled comparator’s

output and the two disabled op amp outputs are in a

high impedance state when shutdown is active. The

disabled comparator’s inputs and the two disabled op

amp inputs can be driven from rail-to-rail by an external

voltage when the TC1043 is in shutdown. No latch-up

will occur when the device is driven to its enabled state

when SHDN is set to VIH.

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