參數(shù)資料
型號(hào): LTC1261CS84.5
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHED CAPACITOR REGULATOR, 550 kHz SWITCHING FREQ-MAX, PDSO8
封裝: PLASTIC, SOIC-8
文件頁(yè)數(shù): 3/16頁(yè)
文件大小: 266K
代理商: LTC1261CS84.5
11
LTC1261
able. The output voltage can be trimmed, if desired, by
connecting external resistance from the COMP pin to OUT
or ground to alter the divider ratio. As in the adjustable
parts, the absolute value of the internal resistors may vary
significantly from unit to unit. As a result, the further the
trim shifts the output voltage the less accurate the output
voltage will be. If a precise output voltage other than one
of the available fixed voltages is required, it is better to use
an adjustable LTC1261 and use precision external resis-
tors. The internal reference is trimmed at the factory to
within 3.5% of 1.24V; with 1% external resistors the
output will be within 5.5% of the nominal value, even
under worst case conditions.
The LTC1261 can be internally configured with nonstand-
ard fixed output voltages. Contact the Linear Technology
Marketing Department for details.
Table 2. Output Voltages Using the Internal Resistor Divider
PIN CONNECTIONS
OUTPUT VOLTAGE
ADJ to RADJ
–5V
ADJ to RADJ, R0 to GND
– 4.5V
ADJ to RADJ, R1 to R0
– 4V
ADJ to RADJ, R1 to GND
– 3.5V
ADJ to R1
– 1.77V
ADJ to R0
– 1.38V
ADJ to GND
– 1.24V
There are some oddball output voltages available by
connecting ADJ to R0 or R1 and shorting out some of the
internal resistors. If one of these combinations gives you
the output voltage you want, by all means use it!
The internal resistor values are the same for the fixed
output versions of the LTC1261 as they are for the adjust-
APPLICATIONS INFORMATION
WU
U
TYPICAL APPLICATIONS N
U
3.3V Input, – 4.5V Output GaAs FET Bias Generator
2
3
4
5
8
13
12
11
10
9
SHDN
REG
OUT
ADJ
RADJ
C1+
C1
C2+
C2
R1
0.1
F
100pF
1
F
NC
LTC1261 TA03
3.3
F
–4.5V BIAS
10k
76
14
0.1
F
SHUTDOWN
3.3V
VBAT
LTC1261
VCC
R0
GND
GaAs
TRANSMITTER
P-CHANNEL
POWER SWITCH
+
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