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PDF LT3045 Data sheet ( Hoja de datos )
| Número de pieza | LT3045 | |
| Descripción | Ultrahigh PSRR Linear Regulator | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT3045 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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LT3045
20V, 500mA, Ultralow Noise,
Ultrahigh PSRR Linear Regulator
Features
nn Ultralow RMS Noise: 0.8µVRMS (10Hz to 100kHz)
nn Ultralow Spot Noise: 2nV/√Hz at 10kHz
nn Ultrahigh PSRR: 76dB at 1MHz
nn Output Current: 500mA
nn Wide Input Voltage Range: 1.8V to 20V
nn Single Capacitor Improves Noise and PSRR
nn 100µA SET Pin Current: ±1% Initial Accuracy
nn Single Resistor Programs Output Voltage
nn High Bandwidth: 1MHz
nn Programmable Current Limit
nn Low Dropout Voltage: 260mV
nn Output Voltage Range: 0V to 15V
nn Programmable Power Good
nn Fast Start-Up Capability
nn Precision Enable/UVLO
nn Parallelable for Lower Noise and Higher Current
nn Internal Current Limit with Foldback
nn Minimum Output Capacitor: 10µF Ceramic
nn Reverse Battery and Reverse Current Protection
nn 12-Lead MSOP and 10-Lead 3mm × 3mm DFN Packages
Applications
nn RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
nn Very Low Noise Instrumentation
nn High Speed/High Precision Data Converters
nn Medical Applications: Imaging, Diagnostics
nn Precision Power Supplies
nn Post-Regulator for Switching Supplies
Description
The LT®3045 is a high performance low dropout linear
regulator featuring LTC’s ultralow noise and ultrahigh
PSRR architecture for powering noise sensitive applica-
tions. Designed as a precision current reference followed
by a high performance voltage buffer, the LT3045 can be
easily paralleled to further reduce noise, increase output
current and spread heat on the PCB.
The device supplies 500mA at a typical 260mV dropout
voltage. Operating quiescent current is nominally 2.2mA
and drops to <<1µA in shutdown. The LT3045’s wide
output voltage range (0V to 15V) while maintaining unity-
gain operation provides virtually constant output noise,
PSRR, bandwidth and load regulation, independent of the
programmed output voltage. Additionally, the regulator
features programmable current limit, fast start-up capa-
bility and programmable power good to indicate output
voltage regulation.
The LT3045 is stable with a minimum 10µF ceramic output
capacitor. Built-in protection includes reverse battery
protection, reverse current protection, internal current
limit with foldback and thermal limit with hysteresis. The
LT3045 is available in thermally enhanced 12-Lead MSOP
and 10-Lead 3mm × 3mm DFN packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. Patents pending. All other trademarks are the property of their
respective owners.
Typical Application
VIN
5V ±5%
4.7µF*
200k
IN LT3045
EN/UV
PG
100µA
–
+
SET GND ILIM
OUT
OUTS
PGFB
*OPTIONAL, SEE
APPLICATIONS
INFORMATION
4.7µF 30.1k
249Ω
10µF
VOUT
3V
IOUT(MAX)
500mA
402k
49.9k
3045 TA01a
For more information www.linear.com/LT3045
Power Supply Ripple Rejection
120
110
100
90
80
70
60
50 VIN = 5V
40
RSET = 30.1k
CSET = 4.7µF
30
COUT = 10µF
IL = 500mA
20
10 100 1k
10k 100k
FREQUENCY (Hz)
1M 10M
3045 TA01b
3045f
1
1 page  
LT3045
Electrical Characteristics
temperatures degrade operating lifetimes. Operating lifetime is derated at
junction temperatures greater than 125°C.
Note 10: Parasitic diodes exist internally between the ILIM, PG, PGFB, SET,
OUTS, and OUT pins and the GND pin. Do not drive these pins more than
0.3V below the GND pin during a fault condition. These pins must remain at
a voltage more positive than GND during normal operation.
Note 11: The current limit programming scale factor is specified while the
internal backup current limit is not active. Note that the internal current
limit has foldback protection for VIN – VOUT differentials greater than 12V.
Note 12: The internal back-up current limit circuitry incorporates foldback
protection that decreases current limit for VIN – VOUT > 12V. Some level of
output current is provided at all VIN – VOUT differential voltages. Consult the
Typical Performance Characteristics graph for current limit vs VIN – VOUT.
Note 13: For output voltages less than 1V, the LT3045 requires a 10µA
minimum load current for stability.
Note 14: Maximum OUT-to-OUTS differential is guaranteed by design.
Typical Performance Characteristics TJ = 25°C, unless otherwise noted.
SET Pin Current
101.0
100.8
100.6
VIN = 2V
IL = 1mA
VOUT = 1.3V
100.4
100.2
100.0
99.8
99.6
99.4
99.2
99.0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3045 G01
SET Pin Current
N = 3250
98 99 100 101 102
ISET DISTRIBUTION (µA)
3045 G02
Offset Voltage (VOUT – VSET)
2.0
VIN = 2V
1.5 IL = 1mA
VOUT = 1.3V
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3045 G03
Offset Voltage
N = 3250
–2 –1
0
1
2
VOS DISTRIBUTION (mV)
3045 G04
SET Pin Current
101.0
100.8
100.6
IL = 1mA
VOUT = 1.3V
100.4
150°C
125°C
25°C
–55°C
100.2
100.0
99.8
99.6
99.4
99.2
99.0
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
3045 G05
Offset Voltage (VOUT – VSET)
2.0
IL = 1mA
150°C
1.5 VOUT = 1.3V
125°C
25°C
1.0 –55°C
0.5
0
–0.5
–1.0
–1.5
–2.0
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
3045 G06
For more information www.linear.com/LT3045
3045f
5
5 Page 
LT3045
Typical Performance Characteristics TJ = 25°C, unless otherwise noted.
Noise Spectral Density as
a Function of Error Amplifier
Input Pair
1000
VOUT ≥ 1.3V
0.6V < VOUT < 1.3V
100 VOUT ≤ 0.6V
Output Noise: 10Hz to 100kHz
5µV/DIV
Load Transient Response
OUTPUT
CURRENT
500mA/DIV
10
1 VIN = VOUT + 2V
IL = 500mA
COUT = 10µF
0.1 CSET = 4.7µF
10 100 1k
10k 100k
FREQUENCY (Hz)
1M 10M
3045 G52
Line Transient Response
VIN = 5V
RSET = 33.2k
COUT = 10µF
CSET = 4.7µF
IL = 500mA
1ms/DIV
3042 G53
Start-Up Time with and
without Fast Start-Up Circuitry for
Large CSET
OUTPUT
VOLTAGE
20mV/DIV
20µs/DIV
VIN = 5V
RSET = 33.2k
COUT = 10µF
CSET = 0.47µF
LOAD STEP = 10mA TO 500mA
Input Supply Ramp-Up and
Ramp-Down
3042 G54
INPUT
VOLTAGE
500mV/DIV
OUTPUT
VOLTAGE
1mV/DIV
VIN = 4.5V TO 5V
RSET = 33.2k
COUT = 10µF
CSET = 0.47µF
IL = 500mA
5µs/DIV
3042 G55
500mV/DIV
OUTPUT WITH
FAST START–UP
(SET AT 90%)
2V/DIV
PULSE EN/UV
OUTPUT WITHOUT
FAST START–UP
VIN = 5V
RSET = 33.2k
COUT = 10µF
CSET = 4.7µF
RL = 6.6Ω
100ms/DIV
3042 G56
INPUT VOLTAGE
2V/DIV
OUTPUT VOLTAGE
VIN = 0V TO 5V
VEN/UV = VIN
RSET = 33.2k
COUT = 10µF
CSET = 0.47µF
RL = 6.6Ω
50ms/DIV
3042 G57
For more information www.linear.com/LT3045
3045f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT3045.PDF ] | |
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