LT6650CS5 LINER [Linear Technology], LT6650CS5 Datasheet - Page 7

• Manufacturer Part Number: LT6650CS5
• Description: Micropower, 400mV Reference with Rail-to-Rail Buffer Amplifier in SOT-23
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
BLOCK DIAGRA
APPLICATIO S I FOR ATIO
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.
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 W 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 F 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
U
U
U
U
U
W
W
DNC
3
U
V
REFERENCE
R
= 400mV
GND
IN
4
2
+
–
IN (Pin 4): Positive Supply. Bypassing with a 1 F capacitor
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 F or more. Higher load capacitance
improves load transient response.
functions. Output impedance can be reduced by DC load-
ing of the output by 40 A to 200 A, and/or adding an R
to the output capacitor for a 100 s time constant as shown
in Figure 1 and the Typical Performance Characteristics
graphs.
The LT6650 Voltage reference should have an input by-
pass capacitor of 0.1 F or larger. When the circuit is
V
IN
R
IN
LT6650
Figure 1. LT6650 Input-Output Configuration
6650 BD
C
IN
5
1
IN
OUT
FB
4
LT6650
2
GND
6650 F01
5
1
OUT
FB
LT6650
R
Z
C
L
7
V
6650f
OUT
Z