LTC1798CS8-3 Linear Technology, LTC1798CS8-3 Datasheet - Page 6

• Manufacturer Part Number: LTC1798CS8-3
• Description: IC REF LDO BANDGAP MCRPWR 8SOIC
• Manufacturer: Linear Technology

Specifications of LTC1798CS8-3

• Reference Type: Series
• Voltage - Output: 3V
• Tolerance: ±0.15%
• Temperature Coefficient: 40ppm/°C
• Voltage - Input: 3.2 ~ 12.6 V
• Number Of Channels: 1
• Current - Quiescent: 6.5µA
• Current - Output: 10mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Cathode: -

LTC1798 Series
BLOCK DIAGRAM
APPLICATIONS INFORMATION
Longer Battery Life
Series references have an advantage over shunt style
references. To operate, shunt references require a resistor
between the power supply and the output. This resistor
must be chosen to supply the maximum current that is
demanded by the circuit being regulated. When the circuit
being controlled is not operating at this maximum current,
the shunt reference must always sink this current, resulting
in high power dissipation and short battery life.
The LTC1798 series low dropout references do not require
a current setting resistor and can operate with any supply
voltage from (V
circuitry being regulated does not demand current, the
LTC1798 series reduces its dissipation and battery life is
extended. If the reference is not delivering load current it
6
100mV/DIV
I
OUT
V
1mA
0mA
OUT
OUT(NOMINAL
10ms/DIV
Figure 1. Reference Output Load Transient Response, 1µF Output Capacitor
) + 0.2V) to 12.6V. When the
NOTE: R1 AND R2 ARE NOT CONNECTED FOR LTC1798
2.385V
1798 F01a
GND
2
IN
4
+
–
dissipates only 10.8µW when operating on a 2.7V supply
for 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 is at a premium.
In applications with significant output loading changes, an
output bypass capacitor of up to 1µF can be used to improve
the output transient response. Figure 1 shows the response
of the reference to a 1mA to 0µA load step with a 1µF output
capacitor. If more than 1µF of output capacitance is required,
a resistor in series with the capacitor is recommended
100mV/DIV
R1
R2
OUT
I
OUT
1798 BD
FB
V
1mA
0mA
6
3 (LTC1798)
OUT
0.5ms/DIV
1798 F01b
1798fc