8

LT1636

TYPICAL PERFOR A CE CHARACTERISTICS

Open-Loop Gain

0V

10V

OUTPUT VOLTAGE (5V/DIV)

A

B

C

C

1636 G24

1636 G25

Large-Signal Response

1636 G26

Small-Signal Response

cause the voltage at which operation switches from the

offset voltage of the NPN stage is untrimmed and is

typically 600

µV.

A Schottky diode in the collector of each NPN transistor of

the NPN input stage allows the LT1636 to operate with

bias current is typically 3

µA at room temperature. The

input offset voltage is typically 600

µV when operating

The inputs are protected against excursions as much as

input and a diode from the input to the negative supply.

There is no output phase reversal for inputs up to 5V below

the maximum differential input voltage is 44V.

Output

The output voltage swing of the LT1636 is affected by in-

put overdrive as shown in the typical performance curves.

should be taken to keep the output from clipping.

The output of the LT1636 can be pulled up to 27V beyond

is less than 0.5V.

Supply Voltage

The positive supply pin of the LT1636 should be bypassed

with a small capacitor (about 0.01

µF) within an inch of the

pin. When driving heavy loads an additional 4.7

µF electro-

lytic capacitor should be used. When using split supplies,

the same is true for the negative supply pin.

The LT1636 is protected against reverse battery voltages

up to 27V. In the event a reverse battery condition occurs,

the supply current is less than 1nA.

When operating the LT1636 on total supplies of 20V or

more, the supply must not be brought up faster than 1

µs.

This is especially true if low ESR bypass capacitors are

used. A series RLC circuit is formed from the supply lead

inductance and the bypass capacitor. 5

Ω of resistance in

the supply or the bypass capacitor will dampen the tuned

circuit enough to limit the rise time.

Inputs

The LT1636 has two input stages, NPN and PNP (see

Simplified Schematic), resulting in three distinct operat-

ing regions as shown in the Input Bias Current vs Common

Mode typical performance curve.

input stage is active and the input bias current is typically

– 4nA. When the input voltage is about 0.5V or less from

current is typically 10nA. Increases in temperature will

A

B

–10V