LTC1261LIMS8-TRPBF Ver la hoja de datos (PDF) - Linear Technology

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LTC1261LIMS8-TRPBF

Switched Capacitor Regulated Voltage Inverter

Linear Technology 

LTC1261L

APPLICATIONS INFORMATION

RESISTOR SELECTION

Resistor selection is easy with the fixed output voltage

versions of the LTC1261L—no resistors are needed! Se-

lecting the right resistors for the adjustable parts is only

a little more difficult. A resistor divider should be used to

divide the signal at the output to give 1.23V at the ADJ

pin with respect to VOUT (Figure 5). The LTC1261L uses

a positive reference with respect to VOUT, not a negative

reference with respect to ground (Figure 1 shows the

reference connection). Be sure to keep this in mind when

connecting the resistors! If the initial output is not what

you expected, try swapping the two resistors.

The LTC1261L can be internally configured for other fixed

output voltages. Contact the Linear Technology Marketing

department for details.

4

GND

LTC1261L

5

ADJ

6

OUT

R1

R2

( ) VOUT = –1.23V

R1 + R2

R2

1261L F05

Figure 5. External Resistor Connections

TYPICAL APPLICATIONS

5V Input, – 4V Output GaAs FET Bias Generator

5V

1µF

VBAT

SHUTDOWN

0.1µF

1 VCC

SHDN 8

2 C1+

REG 7

3

LTC1261L-4

C2–

OUT

6

4 GND COMP 5

P-CHANNEL

POWER SWITCH

10k

– 4V BIAS

+ 3.3µF

100pF

GaAs

TRANSMITTER

1261 TA03

10

1mV Ripple, 5V Input, – 4V Output GaAs FET Bias Generator

5V

1µF

VBAT

SHUTDOWN

0.1µF

1 VCC

SHDN 8

2 C1+

REG 7

3

LTC1261L-4

C2–

OUT

6

4 GND COMP 5

P-CHANNEL

POWER SWITCH

10k

100µH

– 4V BIAS

100pF

+ 10µF

+ 10µF

GaAs

TRANSMITTER

1261 TA04

1261lfa

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