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PDF LTC1550LCS8 Data sheet ( Hoja de datos )
| Número de pieza | LTC1550LCS8 | |
| Descripción | Low Noise/ Switched Capacitor Regulated Voltage Inverters | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1550LCS8 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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FEATURES
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: 0.1µF
s Requires Only Four External Capacitors
s Fixed – 4.1V, –2.5V, –2V or Adjustable Output
s Shutdown Mode Drops Supply Current to <1µA
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
U
APPLICATIO S
s GaAs FET Bias Generators
s Negative Supply Generators
s Battery-Powered Systems
s Single Supply Applications
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
3.6V
+ 2.2µF
CIN
1
SHDN
2
VCC
REG
CPOUT
8
7
LTC1550L-2
3 C1+
GND 6
4
VOUT
C1– 5
R1
10k
POWER VALID
CCP
0.1µF
C1
0.1µF
COUT
10µF
VOUT = –2V
ILOAD = 5mA
CL
0.1µF
1550L/51L TA01
Figure 1. – 2V Generator with 1mVP-P Noise
LTC1550L/LTC1551L
Low Noise, Switched
Capacitor Regulated
Voltage Inverters
DESCRIPTIO
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
0.2µA 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 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.
VOUT Output Noise and Ripple
VOUT
AC COUPLED
2mV/DIV
5µs/DIV
1550L/51L TA01a
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1550L/LTC1551L
Output Spectrum (*See Figure 1)
90
80
70
60
50
40
30
20
10
0
–10
100k
1M
FREQUENCY (Hz)
10M
1550L/51L G10
Spot Noise (See Figure 3)
10
1
0.1 VCC = 5V
IL = 5mA
CIN = 2.2µF
COUT = 4.7µF
CL = 0.1µF
0.01
1
10
FREQUENCY (kHz)
100
1550L/51L G13
Spot Noise (*See Figure 1)
10
1
0.1
0.01
1
10
FREQUENCY (kHz)
100
1550 /51L G11
Output Spectrum (See Figure 3)
90
80
VCC = 5V
IL = 5mA
70 CIN 2.2µF
COUT = 10µF
60 CL = 0.1µF
50
40
30
20
10
0
–10
100k
1M
FREQUENCY (Hz)
10M
1550L/51L G14
Output Spectrum (See Figure 3)
90
80
VCC = 5V
IL = 5mA
70 CIN = 2.2µF
60
COUT = 4.7µF
CL = 0.1µF
50
40
30
20
10
0
–10
100k
1M
FREQUENCY (Hz)
10M
1550L/51L G12
Spot Noise (See Figure 3)
10
VCC = 5V
IL = 5mA
CIN = 2.2µF
COUT = 10µF
1 CL = 0.1µF
0.1
0.01
1
10
FREQUENCY (kHz)
100
1550L/51L G15
* On first page of data sheet.
5
5 Page 
LTC1550L/LTC1551L
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
GN Package
16-Lead Plastic SSOP (Narrow 0.150)
(LTC DWG # 05-08-1641)
0.189 – 0.196*
(4.801 – 4.978)
16 15 14 13 12 11 10 9
0.009
(0.229)
REF
0.229 – 0.244
(5.817 – 6.198)
0.150 – 0.157**
(3.810 – 3.988)
0.007 – 0.0098
(0.178 – 0.249)
0.015
(0.38
±
±
0.004
0.10)
×
45°
0° – 8° TYP
0.016 – 0.050
(0.406 – 1.270)
* 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
1 234 5678
0.053 – 0.068
(1.351 – 1.727)
0.004 – 0.0098
(0.102 – 0.249)
0.008 – 0.012
(0.203 – 0.305)
0.0250
(0.635)
BSC
GN16 (SSOP) 1098
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.007
(0.18)
0° – 6° TYP
0.021 ± 0.006
(0.53 ± 0.015)
0.040 ± 0.006
(1.02 ± 0.15)
SEATING
PLANE
0.012
(0.30)
REF
0.0256
(0.65)
BSC
0.034 ± 0.004
(0.86 ± 0.102)
0.006 ± 0.004
(0.15 ± 0.102)
* 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
0.118 ± 0.004*
(3.00 ± 0.102)
0.193 ± 0.006
(4.90 ± 0.15)
8 76 5
0.118 ± 0.004**
(3.00 ± 0.102)
MSOP (MS8) 1098
1 234
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1550LCS8.PDF ] | |
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