ltc1798 Linear Technology Corporation, ltc1798 Datasheet

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ltc1798

Manufacturer Part Number
ltc1798
Description
Micropower Low Dropout References
Manufacturer
Linear Technology Corporation
Datasheet

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Part Number:
ltc1798CS8
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Part Number:
ltc1798CS8-2.5
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LINEAR/凌特
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Part Number:
ltc1798IS8
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LT
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Part Number:
ltc1798IS8-2.5
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LT
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ltc1798IS8-3
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LT
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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
200mV Max Dropout at 10mA Output Current
4 A Typical Quiescent Current
0.15% Max Initial Accuracy
No Output Capacitor Required
Output Sources 10mA, Sinks 2mA
40ppm/ C Max Drift
Voltage Options: 2.5V, 3V, 4.1V, 5V and Adjustable
Battery-Powered Systems
Handheld Instruments
Precision Power Supplies
A/D and D/A Converters
TO 12.6V
2.7V
2.5V Battery-Powered Reference
U
0.1 F
2
IN
LTC1798-2.5
GND
4
U
OUT
6
1798 TA01
2.5V
DESCRIPTIO
The LTC
LTC1798-5 are micropower bandgap references that com-
bine 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 refer-
ences 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 1 F. 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 dissipa-
tion 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1798/LTC1798-2.5/LTC1798-3/LTC1798-4.1/
– 2
– 3
– 4
–1
Dropout References
4
3
2
1
0
–40
LTC1798-2.5 Temperature Drift
–20
U
Micropower Low
0
TEMPERATURE ( C)
LTC1798 Series
20
40
60
80
1798 TA02
100
1

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ltc1798 Summary of contents

Page 1

... The LTC1798 series references provided power dissipa- tion 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. , LTC and LT are registered trademarks of Linear Technology Corporation. 6 OUT 2.5V ...

Page 2

... Adjustable 0.4 ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full specified temperature range, otherwise specifications are 0.2V 0mA unless otherwise noted OUT for the LTC1798. IN OUT(NOMINAL) OUT SYMBOL PARAMETER V Input Voltage Range IN I Input Current IN V Output Voltage (Note 4) ...

Page 3

... ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full specified temperature range, otherwise specifications are 0.2V 0mA unless otherwise noted OUT for the LTC1798. IN OUT(NOMINAL) OUT SYMBOL PARAMETER e Output Voltage Noise (Note Output Voltage Temp Coefficient (Note ...

Page 4

... INPUT VOLTAGE (V) 1258-G04 LTC1798-2.5* Output Voltage vs Input Voltage 2.5010 2.5005 2.5000 2.4995 INPUT VOLTAGE (V) 1798 G07 LTC1798-2.5 0.1Hz to 10Hz Noise V/DIV 1SEC/DIV 1798 G10 4 LTC1798-2.5* Output Short-Circuit Current vs Input Voltage OUTPUT SHORTED TO GND ...

Page 5

... OUT (Pin 6): Reference Output. The output can source up to 10mA and sink up to 2mA stable with output bypass capacitor ranging from OUT 6 – R1 2.385V FB 3 (LTC1798) R2 GND 4 1798 BD NOTE: R1 AND R2 ARE NOT CONNECTED FOR LTC1798 LTC1798 Series connected from OUT R 2 < 250 A. 5 ...

Page 6

... LTC1798-2.5, yet the same connection can deliver 10mA of load current when demanded. Output Bypass Capacitor The LTC1798 series is designed to be stable with or without capacitive loads. With no capacitive load, the reference is ideal for fast settling applications, or where PC board space premium. ...

Page 7

... U U APPLICATIO S I FOR ATIO Internal P-Channel Pass Transistor The LTC1798 series features an internal P-channel MOSFET pass transistor. This provides several advantages over similar designs using a PNP bipolar pass transistor. PACKAGE DESCRIPTIO 0.010 – 0.020 (0.254 – 0.508) 0.008 – 0.010 (0.203 – ...

Page 8

... LTC1798 Series U TYPICAL APPLICATIO S Micropower Low Dropout Negative Reference OUT LTC1798-3 8 0.1 F GND 2 – 1/2 LTC1542 – Low Power, Low Voltage Supply Reference for LTC1096L ANALOG INPUT RANGE RELATED PARTS PART NUMBER DESCRIPTION ® LT 1389 Nanopower Precision Shunt Voltage Reference ...

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