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LTC1798 Series
1
1798fc
TYPICAL APPLICATION
DESCRIPTION
Micropower Low
Dropout References
The LTC
®
1798/LTC1798-2.5/LTC1798-3/LTC1798-4.1/
LTC1798-5 are micropower bandgap references that
combine high accuracy and low drift with very low supply
current and small package size. The combination of ultralow
quiescent current and low dropout voltage of only 200mV
(max) makes them ideal for battery-powered equipment.
The output voltage is set by an external resistor divider
for the adjustable LTC1798.
This series of references uses curvature compensation to
obtain low temperature coefficient and trimmed thin-film
resistors to achieve high output accuracy. These references
can source up to 10mA and sink up to 2mA, making them
ideal for precision regulator applications. They are stable
without an output bypass capacitor, but are also stable
with capacitance up to 1µF. This feature is important in
critical applications where PC board space is a premium
and fast settling is demanded.
The LTC1798 series references provided power dissipation
advantages over shunt references. In addition to supply
current, shunt references must also idle the entire load
current to operate.
The LTC1798 series is available in the SO-8 package.
2.5V Battery-Powered Reference
FEATURES
APPLICATIONS
n
200mV Max Dropout at 10mA Output Current
n
4µA Typical Quiescent Current
n
0.15% Max Initial Accuracy
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No Output Capacitor Required
n
Output Sources 10mA, Sinks 2mA
n
40ppm/°C Max Drift
n
Voltage Options: 2.5V, 3V, 4.1V, 5V and Adjustable
n
Battery-Powered Systems
n
Handheld Instruments
n
Precision Power Supplies
n
A/D and D/A Converters
n
Available in the SO-8 Package
LTC1798-2.5 Temperature Drift
LTC1798-2.5
OUT
IN
GND
4
2
2.7V
TO 12.6V
6
2.5V
1798 TA01
0.1µF
TEMPERATURE (°C)
–40 –20 0 20 40 60 80 100
REFERENCE VOLTAGE CHANGE (mV)
1798 TA02
4
3
2
1
–2
–1
–3
–4
0
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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