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PDF LTC1682CS8-5 Data sheet ( Hoja de datos )
| Número de pieza | LTC1682CS8-5 | |
| Descripción | Doubler Charge Pumps with Low Noise Linear Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Low Output Noise: 60µVRMS (100kHz BW)
s Adjustable or Fixed Boosted Output
s Adjustable Output Voltage Range: 2.5V to 5.5V
s Fixed Output Voltages: 3.3V, 5V
s Wide Input Voltage Range: 1.8V to 4.4V
s Uses Small Ceramic Capacitors
s No Inductors Required
s Output Current up to 50mA
s 550kHz Switching Frequency
s Low Operating Current: 150µA
s Low Shutdown Current: 1µA
s Internal Thermal Shutdown and Current Limiting
s Available in 8-Pin MSOP and SO Packages
U
APPLICATIO S
s VCO Power Supplies in Cellular Phones
s 2-Way Pagers
s Wireless PCMCIA Cards
s Portable Medical Instruments
s Low Power Data Acquisition
s Remote Transmitters
LTC1682/LTC1682-3.3/LTC1682-5
Doubler Charge Pumps with
Low Noise Linear Regulator
DESCRIPTIO
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 VOUT 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 VIN by
disabling the regulator and discharges VOUT 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, VIN = 2.5V to 4.4V
Open-Loop Close-In Phase Noise
4.7µF
VIN
2.5V TO
4.4V
0.22µF
4.7µF
8 CPO
7 C+
SHUTDOWN
VOUT 1
4.2V
4.7µF
2
SHDN
BP
1000pF
VCO
MURATA
MQE001-902
LTC1682
6 VIN
FB 3
36k
1µF
MC
5 C–
GND 4
15k 1k
1000pF
1000pF
fOUT
902MHz
100k
VC
AMPLITUDE
10dB/DIV
4.7µF
1682 TA01
CENTER = 902MHz
SPAN = 100kHz
SWP = 10 sec
RES BW = 1kHz
VBW = 30Hz
REF = 0dBm
1682 TA02
1
1 page  
LTC1682/LTC1682-3.3/LTC1682-5
TYPICAL PERFOR A CE CHARACTERISTICS
VOUT Voltage vs Temperature
5.030
5.020
5.010
VIN = 3V
IOUT = 10mA
5.000
4.990
LTC1682-5
3.340
3.330
3.320
3.310
LTC1682-3.3
3.300
3.290
1.240
1.238
1.236
LTC1682
1.234
–50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
1682 G09
VOUT Voltage vs Output Current
5.000
4.999
4.998
4.997
4.996
4.995
4.994
4.993
VIN = 3.3V
TA = 25°C
LTC1682-5
3.300
3.299
3.298
3.297
3.296
3.295
3.294
0
LTC1682-3.3
5 10 15 20 25 30 35 40 45 50
OUTPUT CURRENT (mA)
1682 G10
PIN FUNCTIONS
VOUT (Pin 1): Low Noise Regulated Output Voltage. VOUT
should be bypassed with a ≥ 2µF low ESR capacitor as
close to the pin as possible for best performance. The VOUT
range is 2.5V to 5.5V.
SHDN (Pin 2): Shutdown Input. A logic low on the SHDN
pin puts the part in shutdown mode. A logic high enables
the part. To continuously enable the part connect SHDN to
VIN. When the part is in shutdown, VOUT will be connected
to ground via a 100Ω switch and CPO will be high
impedance disconnected from VIN.
FB (Pin 3) (LTC1682): The voltage on this pin is compared
to the internal reference voltage (1.235V) by the error
amplifier to keep the output in regulation. An external
resistor divider is required between VOUT and FB to adjust
the output voltage.
FILT (Pin 3) (LTC1682-3.3/LTC1682-5): This pin is used
to filter the internal voltage reference. Typically a 1nF
capacitor is connected from FILT to ground.
GND (Pin 4): System Ground.
C – (Pin 5): Flying Capacitor Negative Input.
VIN (Pin 6): Input Voltage, 1.8V to 4.4V. VIN should be
bypassed with a ≥ 2µF low ESR capacitor as close to the
pin as possible for best performance. A minimum capaci-
tance value of 0.1µF is required.
C+ (Pin 7): Flying Capacitor Positive Input.
CPO (Pin 8): Unregulated Charge Pump Output Voltage.
Approximately 1.95(VIN) at low loads. Bypass with a ≥ 2µF
low ESR capacitor. If a minimum VOUT enable time is
required, the CPO capacitor should be 2× the VOUT
capacitor.
5
5 Page 
TYPICAL APPLICATION
LTC1682/LTC1682-3.3/LTC1682-5
3.3V to Low Noise 3.3V Converter
C3
4.7µF
VIN
3.3V C4
4.7µF
C1
0.22µF
SHUTDOWN
8 CPO
1
VOUT
7 C+
2
SHDN
LTC1682-3.3
6 VIN
3
FILT
5 C–
4
GND
C2
4.7µF
3.3V
VRIPPLE = 500µVP-P
CFILT
1nF
1682 TA03
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 ± 0.004*
(3.00 ± 0.102)
0.007
(0.18)
0° – 6° TYP
0.040 ± 0.006
(1.02 ± 0.15)
0.021 ± 0.006
(0.53 ± 0.015)
SEATING
PLANE
0.012
(0.30)
REF
0.0256
(0.65)
TYP
0.034 ± 0.004
(0.86 ± 0.102)
0.006 ± 0.004
(0.15 ± 0.102)
0.192 ± 0.004
(4.88 ± 0.10)
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
8 76 5
0.118 ± 0.004**
(3.00 ± 0.102)
MSOP (MS8) 1197
1 234
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
TYP
0.228 – 0.244
(5.791 – 6.197)
0.189 – 0.197*
(4.801 – 5.004)
8 765
1 2 34
0.150 – 0.157**
(3.810 – 3.988)
SO8 0996
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1682CS8-5.PDF ] | |
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