LT3045
1
Rev. C
For more information www.analog.com
TYPICAL APPLICATION
FEATURES DESCRIPTION
20V, 500mA, Ultralow Noise,
Ultrahigh PSRR Linear Regulator
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.
Power Supply Ripple Rejection
APPLICATIONS
n
Ultralow RMS Noise: 0.8µV
RMS
(10Hz to 100kHz)
n
Ultralow Spot Noise: 2nV/√Hz at 10kHz
n
Ultrahigh PSRR: 76dB at 1MHz
n
Output Current: 500mA
n
Wide Input Voltage Range: 1.8V to 20V
n
Single Capacitor Improves Noise and PSRR
n
100µA SET Pin Current: ±1% Initial Accuracy
n
Single Resistor Programs Output Voltage
n
High Bandwidth: 1MHz
n
Programmable Current Limit
n
Low Dropout Voltage: 260mV
n
Output Voltage Range: 0V to 15V
n
Programmable Power Good
n
Fast Start-Up Capability
n
Precision Enable/UVLO
n
Parallelable for Lower Noise and Higher Current
n
Internal Current Limit with Foldback
n
Minimum Output Capacitor: 10µF Ceramic
n
Reverse-Battery and Reverse-Current Protection
n
12-Lead MSOP and 10-Lead 3mm × 3mm DFN Packages
n
AEC-Q100 Qualified for Automotive Applications
n
RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
n
Very Low Noise Instrumentation
n
High Speed/High Precision Data Converters
n
Medical Applications: Imaging, Diagnostics
n
Precision Power Supplies
n
Post-Regulator for Switching Supplies
All registered trademarks and trademarks are the property of their respective owners.
V
IN
= 5V
R
SET
= 30.1k
C
SET
= 4.7µF
C
OUT
= 10µF
L
= 500mA
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
10M
20
30
40
50
60
70
80
90
100
110
120
PSRR (dB)
3045 TA01b
+
–
100µA
IN
EN/UV
PG
GND
OUT
LT3045
ILIM PGFB
402k
10µF
4.7µF*
*OPTIONAL, SEE
APPLICATIONS
INFORMATION
V
IN
5V ±5%
200k
4.7µF
V
OUT
3V
I
OUT(MAX)
500mA
49.9k
3045 TA01a
249Ω
30.1k
SET
OUTS
Document Feedback
LT3045
2
Rev. C
For more information www.analog.com
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
IN Pin Voltage .........................................................±22V
EN/UV Pin Voltage ..................................................±22V
IN-to-EN/UV Differential..........................................±22V
PG Pin Voltage (Note 10) ...............................–0.3V, 22V
ILIM Pin Voltage (Note 10) ...............................–0.3V, 1V
PGFB Pin Voltage (Note 10) ...........................–0.3V, 22V
SET Pin Voltage (Note 10) ..............................–0.3V, 16V
SET Pin Current (Note 7) .................................... ±20mA
OUTS Pin Voltage (Note 10) ........................... –0.3V, 16V
OUTS Pin Current (Note 7) ................................. ±20mA
OUT Pin Voltage (Note 10) .............................–0.3V, 16V
(Note 1)
TOP VIEW
11
GND
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
T
JMAX
= 150°C, θ
JA
= 34°C/W, θ
JC
= 5.5°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
10
9
6
7
8
4
5
3
2
1
OUT
OUTS
GND
SET
PGFB
IN
IN
EN/UV
PG
ILIM
1
2
3
4
5
6
IN
IN
IN
EN/UV
PG
ILIM
12
11
10
9
8
7
OUT
OUT
OUTS
GND
SET
PGFB
TOP VIEW
MSE PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 150°C, θ
JA
= 33°C/W, θ
JC
= 8°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
13
GND
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3045EDD#PBF LT3045EDD#TRPBF LGYP 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3045IDD#PBF LT3045IDD#TRPBF LGYP 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT3045HDD#PBF LT3045HDD#TRPBF LGYP 10-Lead (3mm × 3mm) Plastic DFN –40°C to 150°C
LT3045MPDD#PBF LT3045MPDD#TRPBF LYGP 10-Lead (3mm × 3mm) Plastic DFN –55°C to 150°C
LT3045EMSE#PBF LT3045EMSE#TRPBF 3045 12-Lead Plastic MSOP –40°C to 125°C
LT3045IMSE#PBF LT3045IMSE#TRPBF 3045 12-Lead Plastic MSOP –40°C to 125°C
LT3045HMSE#PBF LT3045HMSE#TRPBF 3045 12-Lead Plastic MSOP –40°C to 150°C
AUTOMOTIVE PRODUCTS**
LT3045EMSE#WPBF LT3045EMSE#WTRPBF 3045 12-Lead Plastic MSOP –40°C to 125°C
LT3045IMSE#WPBF LT3045IMSE#WTRPBF 3045 12-Lead Plastic MSOP –40°C to 125°C
LT3045HMSE#WPBF LT3045HMSE#WTRPBF 3045 12-Lead Plastic MSOP –40°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
**Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
thesemodels.
OUT-to-OUTS Differential (Note 14) ....................... ±1.2V
IN-to-OUT Differential .............................................±22V
IN-to-OUTS Differential ........................................... ±22V
Output Short-Circuit Duration .......................... Indefinite
Operating Junction Temperature Range (Note 9)
E-Grade, I-Grade
............................... –40°C to 125°C
H-Grade,
........................................... –40°C to 150°C
MP-Grade (Note 15) ........................... –55°C to 150°C
Storage Temperature Range
.............. –65°C to 150°C
Lead Temperature (Soldering, 10 Sec)
MSE Package ................................................... 300°C