參數(shù)資料
型號: LTC1261
廠商: Linear Technology Corporation
英文描述: Switched Capacitor Regulated Voltage Inverter(開關(guān)電容穩(wěn)壓電壓反相器)
中文描述: 開關(guān)電容穩(wěn)壓逆變器(開關(guān)電容穩(wěn)壓電壓反相器)
文件頁數(shù): 11/16頁
文件大?。?/td> 265K
代理商: LTC1261
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
ADJ to R
ADJ
ADJ to R
ADJ
, R0 to GND
ADJ to R
ADJ
, R1 to R0
ADJ to R
ADJ
, R1 to GND
ADJ to R1
ADJ to R0
ADJ to GND
OUTPUT VOLTAGE
–5V
–4.5V
–4V
–3.5V
–1.77V
–1.38V
–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-
APPLICATIO
S I
FOR
ATIO
U
W
U
U
TYPICAL APPLICATIO
S
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
R
ADJ
GND
C1
+
C1
C2
+
C2
R1
0.1
μ
F
100pF
1
μ
F
NC
LTC1261 TA03
3.3
μ
F
–4.5V BIAS
10k
7
6
14
0.1
μ
F
SHUTDOWN
3.3V
V
BAT
LTC1261
V
CC
R0
GaAs
TRANSMITTER
P-CHANNEL
POWER SWITCH
+
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