LT6650

7

6650f

APPLICATIO S I FOR ATIO

PI FU CTIO S

BLOCK DIAGRA

FB (Pin 1): Resistor Divider Feedback Pin. Connect a

resistor divider from OUT to GND and the center tap to FB.

This pin sets the output potential.

GND (Pin 2): Ground Connection.

DNC (Pin 3): Do not connect. Connected internally for post

package trim. This pin must be left unconnected.

IN (Pin 4): Positive Supply. Bypassing with a 1

µFcapacitor

is recommended if the output loading changes.

OUT (Pin 5): Reference Output. The output sources and

sinks current. It is stable with any load capacitor with a

total capacitance of 1

µF or more. Higher load capacitance

improves load transient response.

OUT

DNC

FB

IN

GND

LT6650

–

+

REFERENCE

6650 BD

4

2

3

5

1

Long Battery Life

The LT6650 is a micropower, adjustable reference which

operates from supply voltages ranging from 1.4V to 18V.

The series regulated output may be configured with exter-

nal resistors to any voltage from 400mV to nearly the

supply potential. Under no-load conditions, the LT6650

dissipates only 8

µW when operating on a 1.4V supply.

Other operating configurations allow the LT6650 to be

used as a micropower positive or negative adjustable

shunt reference from 1.4V to 18V.

Bypass and Load Capacitor

The LT6650 voltage reference requires a 1

µF or greater

output capacitance for proper operation. This capacitance

may be provided by either a single capacitor connected

between OUT and GND or formed by the aggregate of

several capacitors that may be serving other decoupling

functions. Output impedance can be reduced by DC load-

ing of the output by 40

to the output capacitor for a 100

µstimeconstantasshown

in Figure 1 and the Typical Performance Characteristics

graphs.

The LT6650 Voltage reference should have an input by-

pass capacitor of 0.1

µF or larger. When the circuit is

Figure 1. LT6650 Input-Output Configuration

OUT

IN

FB

GND

LT6650

6650 F01

2

4

5

1