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LTC1550LCS8-2.5#TRPBF

Description
Switching RegulatorLow Noise Sw Cap Volt Invert
CategoryPower/power management    The power supply circuit   
File Size235KB,12 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Parametric View All

LTC1550LCS8-2.5#TRPBF Overview

Switching RegulatorLow Noise Sw Cap Volt Invert

LTC1550LCS8-2.5#TRPBF Parametric

Parameter NameAttribute value
Brand NameAnalog Devices Inc
Is it lead-free?Contains lead
Is it Rohs certified?conform to
MakerADI
package instructionSOP,
Contacts8
Manufacturer packaging code05-08-1610 (S8)
Reach Compliance Codecompliant
Analog Integrated Circuits - Other TypesSWITCHED CAPACITOR REGULATOR
Maximum input voltage5.25 V
Minimum input voltage2.7 V
Nominal input voltage5 V
JESD-30 codeR-PDSO-G8
JESD-609 codee3
length4.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)250
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationDOUBLER INVERTER
Maximum switching frequency900 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3.9 mm
LTC1550L/LTC1551L
Low Noise, Switched
Capacitor Regulated
Voltage Inverters
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
Regulated Negative Voltage from a Single
Positive Supply
Low Output Ripple: Less Than 1mV
P-P
Typ
High Charge Pump Frequency: 900kHz
Small Charge Pump Capacitors: 0.1µF
Requires Only Four External Capacitors
Fixed – 4.1V, –2.5V, –2V or Adjustable Output
Shutdown Mode Drops Supply Current to <1µA
High Output Current: Up to 20mA (Depending on
V
CC
to V
OUT
Range)
Output Regulation: 2.5% Over Line, Load and
Temperature
Available in 8-Lead MSOP, 8-Lead Narrow SO and
16-Lead Narrow SSOP
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
0.2µA 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 0.1µF 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.
V
OUT
Output Noise and Ripple
APPLICATIO S
s
s
s
s
GaAs FET Bias Generators
Negative Supply Generators
Battery-Powered Systems
Single Supply Applications
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
3.6V
1
2
SHDN
V
CC
C1
+
V
OUT
REG
CP
OUT
8
7
R1
10k
POWER VALID
+
2.2µF
C
IN
LTC1550L-2
3
4
GND
C1
6
5
C
CP
0.1µF
V
OUT
AC COUPLED
2mV/DIV
C1
0.1µF
C
OUT
10µF
V
OUT
= –2V
I
LOAD
= 5mA
C
L
0.1µF
1550L/51L TA01
Figure 1. – 2V Generator with 1mV
P-P
Noise
U
5µs/DIV
1550L/51L TA01a
U
+
U
1
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