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What is LT3045-1?

This electronic component, produced by the manufacturer "Linear", performs the same function as "Ultrahigh PSRR Linear Regulator".


LT3045-1 Datasheet PDF - Linear

Part Number LT3045-1
Description Ultrahigh PSRR Linear Regulator
Manufacturers Linear 
Logo Linear Logo 


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LT3045-1
20V, 500mA, Ultralow Noise,
Ultrahigh PSRR Linear Regulator with VIOC Control
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 VIOC Pin Controls Upstream Regulator to Minimize
Power Dissipation
nn Single Resistor Programs Output Voltage
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 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 Post-Regulator for Switching Supplies
Description
The LT®3045-1 is a high performance low dropout linear
regulator featuring LTC’s ultralow noise and ultrahigh PSRR
architecture for powering noise sensitive applications. De-
signed as a precision current reference followed by a high
performance voltage buffer, the LT3045-1 can be easily
paralleled to further reduce noise, increase output current
and spread heat on the PCB. In addition to the LT3045
feature set, the LT3045-1 incorporates a VIOC tracking
function to control an upstream switching converter to
maintain a constant voltage across the LT3045-1 and
hence minimize power dissipation.
The device supplies 500mA at a typical 260mV dropout
voltage. Operating quiescent current is nominally 2.3mA
and drops to <<1µA in shutdown. The LT3045-1’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 LT3045-1 is stable with a minimum 10µF ceramic
output capacitor. Built-in protection includes reverse bat-
tery protection, reverse current protection, internal current
limit with foldback and thermal limit with hysteresis. The
LT3045-1 is available in thermally enhanced 12-Lead
MSOP and 3mm × 3mm DFN packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. Patents pending. All other trademarks are the property of their respective owners.
Typical Application
VIN
12V
0.22µF
LT8608
IN BST
2.2µH
47µF
EN/UV SW
TR/SS
10nF
MODE
PG
40.2k
RT FB
INTVCC GND
2.21k
7.68k VLDOIN – VLDOUT = 1V
1µF
fSW = 1MHz
L: XFL4020-222MEC
IN LT3045-1
EN/UV
PG
100µA
+
OUT
VIOC
SET
OUTS
GND ILIM PGFB
4.7µF
249Ω
VOUT: VARIABLE
IOUT(MAX): 500mA
10µF
30451 TA01a
For more information www.linear.com/LT3045-1
Noise Spectral Density
1000
100
LDOIN = 4.3V
LDOOUT = 3.3V
ILOAD = 500mA
10
1
0.1
0.01
10
LDOOUT
LDOIN
Noise Floor
100 1k 10k 100k
FREQUENCY (Hz)
1M 10M
30451 TA01b
30451f
1

line_dark_gray
LT3045-1 equivalent
Electrical Characteristics
Note 6: GND pin current is tested with VIN = VOUT(NOMINAL) and a current
source load. Therefore, the device is tested while operating in dropout. This
is the worst-case GND pin current. GND pin current decreases at higher
input voltages. Note that GND pin current does not include SET pin or ILIM
pin current but Quiescent current does include them.
Note 7: SET and OUTS pins are clamped using diodes and two 25Ω series
resistors. For less than 5ms transients, this clamp circuitry can carry
more than the rated current. Refer to Applications Information for more
information.
Note 8: Adding a capacitor across the SET pin resistor decreases output
voltage noise. Adding this capacitor bypasses the SET pin resistor’s
thermal noise as well as the reference current’s noise. The output noise
then equals the error amplifier noise. Use of a SET pin bypass capacitor
also increases start-up time.
Note 9: The LT3045-1 is tested and specified under pulsed load conditions
such that TJ ≈ TA. The LT3045-1E is 100% tested at 25°C and performance
is guaranteed from 0°C to 125°C. Specifications over the –40°C to 125°C
operating temperature range are assured by design, characterization, and
correlation with statistical process controls. The LT3045-1I is guaranteed
over the full –40°C to 125°C operating temperature range. High junction
LT3045-1
temperatures degrade operating lifetimes. Operating lifetime is derated at
junction temperatures greater than 125°C.
Note 10: Parasitic diodes exist internally between the VIOC, 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 LT3045-1 requires a 10µA
minimum load current for stability.
Note 14: Maximum OUT-to-OUTS differential is guaranteed by design.
Note 15: The VIOC buffer outputs a voltage equal to VIN – VOUT or
VIN – 1.5V (for VOUT ≤ 1.5V). See Block Diagram and Applications
Information for further information. The VIOC pin’s source current should
be set between 10µA and 200µA.
For more information www.linear.com/LT3045-1
30451f
5


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