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参数资料
| 型号： | LTC1551LCS8#TR-4.1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 1/12页 |
| 文件大小： | 271K |
| 代理商： | LTC1551LCS8#TR-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 1mVP-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
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
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 VCC to VOUT 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
s/DIV
1550L/51L TA01a
s
Regulated Negative Voltage from a Single
Positive Supply
s
Low Output Ripple: Less Than 1mVP-P Typ
s
High Charge Pump Frequency: 900kHz
s
Small Charge Pump Capacitors: 0.1
F
s
Requires Only Four External Capacitors
s
Fixed – 4.1V, –2.5V, –2V or Adjustable Output
s
Shutdown Mode Drops Supply Current to <1
A
s
High Output Current: Up to 20mA (Depending on
VCC to VOUT Range)
s
Output Regulation: 2.5% Over Line, Load and
Temperature
s
Available in 8-Lead MSOP, 8-Lead Narrow SO and
16-Lead Narrow SSOP
s
GaAs FET Bias Generators
s
Negative Supply Generators
s
Battery-Powered Systems
s
Single Supply Applications
VOUT
AC COUPLED
2mV/DIV
VOUT Output Noise and Ripple
Figure 1. – 2V Generator with 1mVP-P Noise
1
2
3.6V
8
7
REG
CPOUT
SHDN
VCC
C1+
VOUT
LTC1550L-2
GND
C1–
COUT
10
F
1550L/51L TA01
VOUT = –2V
ILOAD = 5mA
CCP
0.1
F
R1
10k
POWER VALID
C1
0.1
F
2.2
F
CIN
3
4
6
5
CL
0.1
F
+
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1550LCMS8#TR-2 | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC1550LCS8#TR-4.1 | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC1550LCMS8#TR-2.5 | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC1597-1BCN#TRPBF | PARALLEL, WORD INPUT LOADING, 1 us SETTLING TIME, 16-BIT DAC, PDIP28 |
| LTC1597ACN#TRPBF | PARALLEL, WORD INPUT LOADING, 1 us SETTLING TIME, 16-BIT DAC, PDIP28 |
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