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LTC1550L Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC1550L
Description  Low Noise, Switched Capacitor Regulated Voltage Inverters
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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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
µA 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
µF 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
µs/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
µF
s
Requires Only Four External Capacitors
s
Fixed – 4.1V, –2.5V, –2V or Adjustable Output
s
Shutdown Mode Drops Supply Current to <1
µA
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
µF
1550L/51L TA01
VOUT = –2V
ILOAD = 5mA
CCP
0.1
µF
R1
10k
POWER VALID
C1
0.1
µF
2.2
µF
CIN
3
4
6
5
CL
0.1
µF
+
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
DESCRIPTIO




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