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LTC1682IS8-3.3#TRPBF

Description
Charge Pump STPUP 3.3V 50mA 8-Pin SOIC N T/R
File Size188KB,12 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC1682IS8-3.3#TRPBF Overview

Charge Pump STPUP 3.3V 50mA 8-Pin SOIC N T/R

LTC1682IS8-3.3#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
FunctionStep Up
Output TypeFixed
Output Voltage (V)3.3
Maximum Supply Current (mA)0.3
Output Current (mA)50(Max)
Switching Frequency (kHz)620
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeIndustrial
PackagingTape and Reel
Pin Count8
Standard Package NameSOP
Supplier PackageSOIC N
MountingSurface Mount
Package Height1.5(Max)
Package Length5(Max)
Package Width3.99(Max)
PCB changed8
Lead ShapeGull-wing
LTC1682/LTC1682-3.3/LTC1682-5
Doubler Charge Pumps with
Low Noise Linear Regulator
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Low Output Noise: 60
µ
V
RMS
(100kHz BW)
Adjustable or Fixed Boosted Output
Adjustable Output Voltage Range: 2.5V to 5.5V
Fixed Output Voltages: 3.3V, 5V
Wide Input Voltage Range: 1.8V to 4.4V
Uses Small Ceramic Capacitors
No Inductors Required
Output Current up to 50mA
550kHz Switching Frequency
Low Operating Current: 150µA
Low Shutdown Current: 1µA
Internal Thermal Shutdown and Current Limiting
Available in 8-Pin MSOP and SO Packages
APPLICATIO S
s
s
s
s
s
s
VCO Power Supplies in Cellular Phones
2-Way Pagers
Wireless PCMCIA Cards
Portable Medical Instruments
Low Power Data Acquisition
Remote Transmitters
The LTC
®
1682/LTC1682-3.3/LTC1682-5 are doubler charge
pumps with an internal low noise, low dropout (LDO) linear
regulator. These parts are designed to provide a low noise
boosted supply voltage for powering noise sensitive devices
such as high frequency VCOs in wireless applications.
An internal doubler charge pump converts a 1.8V to 4.4V
input to a boosted output, while the internal LDO regulator
converts the boosted voltage to a low noise regulated output.
The adjustable version allows the user to set V
OUT
via external
resistors connected to FB. The regulator is capable of supply-
ing up to 50mA of output current. Shutdown reduces the
supply current to < 5µA, removes the load from V
IN
by
disabling the regulator and discharges V
OUT
to ground
through a 100Ω switch.
The LTC1682 LDO regulator is stable with only 2µF on the
output. Small ceramic capacitors can be used, reducing PC
board area.
The LTC1682/LTC1682-3.3/LTC1682-5 are short-circuit and
over temperature protected. The parts are available in 8-pin
MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
4.2V VCO Power Supply, V
IN
= 2.5V to 4.4V
SHUTDOWN
8
4.7µF
7
V
IN
2.5V TO
4.4V
6
0.22µF
4.7µF
5
C
GND
4
C
+
V
IN
SHDN
LTC1682
FB
36k
3
15k
1µF
1k
1000pF
1000pF
4.7µF
1682 TA01
CPO
V
OUT
1
2
4.2V
4.7µF
1000pF
B
P
VCO
MURATA
MQE001-902
M
C
f
OUT
902MHz
100k
V
C
AMPLITUDE
10dB/DIV
U
Open-Loop Close-In Phase Noise
CENTER = 902MHz
SPAN = 100kHz
SWP = 10 sec
RES BW = 1kHz
VBW = 30Hz
REF = 0dBm
1682 TA02
U
U
1
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