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參數(shù)資料
| 型號(hào)： | LTC1551LCS8-4.1 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low Noise, Switched Capacitor Regulated Voltage Inverters |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 271K |
| 代理商： | LTC1551LCS8-4.1 |
1
LTC1550L/LTC1551L
Low Noise, Switched
Capacitor Regulated
Voltage Inverters
The LTC
1550L/LTC1551L are switched capacitor charge
pump voltage inverters which include internal linear post-
regulators to minimize output ripple. The LTC1550L fixed
output voltage versions include –4.1V, –2.5V and –2V with
ripple voltages typically below 1mV
P-P
. The LTC1550L is
also available in an adjustable output voltage version. The
LTC1550L/LTC1551L are ideal for use as bias voltage
generators for GaAs transmitter FETs in portable RF and
cellular telephone applications.
The LTC1550L/LTC1551L operate from single 2.7V to
5.5V supplies and draw typical quiescent currents of
3.5mA with a 5V supply. Each device includes a TTL
compatible Shutdown pin which drops supply current to
0.2
μ
A typically. The LTC1550L Shutdown pin is active low
(SHDN), while the LTC1551L Shutdown pin is active high
(SHDN). Only four external components are required: an
input bypass capacitor, two 0.1
μ
F charge pump capacitors
and a filter capacitor at the linear regulator output. The
adjustable LTC1550L/LTC1551L require two additional re-
sistors to set the output voltage. The LTC1550L/LTC1551L
will supply up to 20mA (depending on V
CC
to V
OUT
range),
while maintaining guaranteed output regulation of
±
2.5%.
Both fixed voltage and adjustable LTC1550L/LTC1551L
are available in 8-lead MSOP and SO plastic packages: the
adjustable LTC1550L is also available in a 16-pin SSOP
with the REG pin.
, LTC and LT are registered trademarks of Linear Technology Corporation.
5
μ
s/DIV
1550L/51L TA01a
I
Regulated Negative Voltage from a Single
Positive Supply
I
Low Output Ripple: Less Than 1mV
P-P
Typ
I
High Charge Pump Frequency: 900kHz
I
Small Charge Pump Capacitors: 0.1
μ
F
I
Requires Only Four External Capacitors
I
Fixed –4.1V, –2.5V, –2V or Adjustable Output
I
Shutdown Mode Drops Supply Current to <1
μ
A
I
High Output Current: Up to 20mA (Depending on
V
CC
to V
OUT
Range)
I
Output Regulation: 2.5% Over Line, Load and
Temperature
I
Available in 8-Lead MSOP, 8-Lead Narrow SO and
16-Lead Narrow SSOP
I
GaAs FET Bias Generators
I
Negative Supply Generators
I
Battery-Powered Systems
I
Single Supply Applications
V
AC COUPLED
2mV/DIV
V
OUT
Output Noise and Ripple
Figure 1. –2V Generator with 1mV
P-P
Noise
1
2
3.6V
8
7
REG
CP
OUT
SHDN
V
CC
C1
+
V
OUT
LTC1550L-2
GND
C1
–
C
OUT
10
μ
F
1550L/51L TA01
V
OUT
= –2V
I
LOAD
= 5mA
C
CP
0.1
μ
F
R1
10k
POWER VALID
C1
0.1
μ
F
2.2
μ
F
C
IN
3
4
6
5
C
L
0.1
μ
F
+
+
APPLICATIU
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
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