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參數(shù)資料
| 型號(hào)： | LTC1550CS8#TR-4.1 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大小： | 287K |
| 代理商： | LTC1550CS8#TR-4.1 |
1
LTC1550/LTC1551
Low Noise, Switched
Capacitor Regulated
Voltage Inverters
FEATURES
s
Regulated Negative Voltage from a Single
Positive Supply
s
Low Output Ripple: Less Than 1mVP-P Typ
s
High Charge Pump Frequency: 900kHz Typ
s
Small Charge Pump Capacitors: 0.1
F
s
Requires Only Four External Capacitors
s
Fixed – 4.1V or Adjustable Output
s
Shutdown Mode Drops Supply Current to < 1
A
s
High Output Current: Up to 10mA, VCC = 5V
s
Output Regulation: 5%
s
Available in SO-8 and 16-Lead SSOP
s
GaAs FET Bias Generators
s
Negative Supply Generators
s
Battery-Powered Systems
s
Single Supply Applications
APPLICATIONS
U
DESCRIPTION
U
The LTC
1550/LTC1551 are switched capacitor charge
pump voltage inverters which include internal linear post-
regulators to minimize output ripple. Output voltages are
fixed at – 4.1V, with ripple voltages typically below 1mVP-P.
The LTC1550 is also available in an adjustable output
voltage version. The LTC1550/LTC1551 are ideal for use
as bias voltage generators for GaAs transmitter FETs in
portable RF and cellular telephone applications.
The LTC1550/LTC1551 operate from single 4.5V to 6.5V
supplies and draw typical quiescent currents of 4.25mA
with a 5V supply. Each device includes a TTL compatible
Shutdown pin which drops supply current to 0.2
A typi-
cally. The LTC1550 Shutdown pin is active low (SHDN),
while the LTC1551 Shutdown pin is active high (SHDN).
Only four external components are required: an input bypass
capacitor, two 0.1
F charge pump capacitors and a filter
capacitoratthelinearregulatoroutput.TheadjustableLTC1550
requires two additional resistors to set the output voltage. The
LTC1550/LTC1551 will supply up to 10mA output current
with a 5V supply, while maintaining guaranteed output
regulation of
±5%.
The fixed voltage LTC1550/LTC1551 are available in S0-8
plastic packages. The adjustable LTC1550 is available in a
16-pin SSOP.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
U
VOUT Output Noise and Ripple
10
s/DIV
1550/51 TA02
VOUT
AC COUPLED
2mV/DIV
– 4.1V Generator with 1mVP-P Noise
1
2
VCC
8
7
SENSE
CPOUT
SHDN
VCC
C1+
VOUT
LTC1551
FERRITE BEAD
GND
C1–
COUT
10
F
1550/51 F01
VOUT = –4.1V
ILOAD = 5mA
CCP
0.1
F
C1
0.1
F
4.7
F
CIN
3
4
6
5
CL
0.1
F
+
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