High Performance Low Dropout
Linear Regulators (LDOs)
Linear Technology’s high performance low dropout linear regulators (LDOs)
offer very low dropout, fast
transient response, ultralow noise, ultrahigh PSRR, excellent line and load regulation and have a very wide input voltage range,
from 0.9V to 80V. Output currents range from 100mA to 10A, with positive, negative and multiple outputs. LDO+
™
devices provide
additional functionality and features beyond the basic linear regulator performance. Functionality may include voltage, current
and temperature monitoring, diagnostic information and features such as programmable current limit, active output discharge
or the ability to control an upstream supply powering the LDO (VIOC).
Ultralow Noise, Ultrahigh PSRR LDOs
LT
®
3042 – 20V, 200mA, Ultralow Noise,
Ultrahigh PSRR RF Linear Regulator
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Ultralow RMS Noise: 0.8μV
RMS
(10Hz to 100kHz)
Ultralow Spot Noise: 2nV/√Hz at 10kHz
Ultrahigh PSRR: 79dB at 1MHz
Wide Input Voltage Range: 1.8V to 20V
Single Capacitor Improves Noise and PSRR
100μA SET Pin Current: ±1% Initial Accuracy
10-Lead MSOP and 3mm × 3mm DFN Packages
LT3045 – 20V, 500mA, Ultralow Noise,
Ultrahigh PSRR RF Linear Regulator
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Ultralow RMS Noise: 0.8μV
RMS
(10Hz to 100kHz)
Ultralow Spot Noise: 2nV/√Hz at 10kHz
Ultrahigh PSRR: 76dB at 1MHz
Wide Input Voltage Range: 1.8V to 20V
Single Capacitor Improves Noise and PSRR
100μA SET Pin Current: ±1% Initial Accuracy
12-Lead MSOP and 3mm × 3mm DFN Packages
(DFN is Pin Compatible with LT3042)
Part
Number
LT3042
LT3045
1.8V − 20V
1.8V – 20V
V
IN
Range
V
OUT
Range
0V − 15V
0V − 15V
200mA
500mA
I
OUT
Dropout
Voltage
350mV
280mV
PSRR at 1MHz
79dB
76dB
Output Noise
0.8µV
RMS
0.8µV
RMS
Spot Noise
2nV/√Hz
2nV/√Hz
Packages
MSOP-10, 3 × 3 DFN-10*
MSOP-12, 3 × 3 DFN-10*
* Pin Compatible.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LDO+ is a
trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners.
LDO+ Family – High Performance with Extra Features
LDO+ devices provide additional functionality and features beyond the basic linear regulator performance. Functionality may include
wide safe operating area (SOA), voltage, current and temperature monitoring, diagnostic information and features such as programmable
current limit, active output discharge or the ability to control an upstream supply powering the LDO (VIOC).
LT3086 − 40V, 2.1A Low Dropout Adjustable
Linear Regulator with Monitoring and
Cable Drop Compensation
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Tight Output Regulation
±2% Over Everything
V
IN
: 2V to 40V
V
OUT
93k
SHDN
SET
TEMP
TRACK
I
MON
I
LIM
GND
Cable Drop
Compensation
Wide Input Voltage Range: 1.4V to 40V
1 Resistor Sets Output Voltage: 0.4V to 32V
±2% Tolerance Over Line, Load and Temperature
Output Current Monitor: I
MON
= I
OUT
/1000
Temperature Monitor with Programmable Thermal Limit
Programmable Cable Drop Compensation
Parallel Multiple Devices for Higher Current
Dropout Voltage: 330mV
CABLE
R
LINE1
IN
OUT
Temp. Monitor
10mV/°C
To ADC
LT3086
CABLE
COMP
R
PWRGD
CDC
SET
82k
100k
PWRGD
PWRGD
V
LOAD
: 0.4V to
O
A
32V@2.1A
D
L
Current
Monitor mA/A
R
MON
350
Power Good
R
LINE2
LT3081 − 1.5A Single Resistor Rugged Linear
Regulator with Monitors
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Extended Safe Operating Area (SOA)
Stable with or without Input/Output Capacitors
Wide Input Voltage Range: 1.2V to 36V
Single Resistor Sets Output Voltage
Output Current Monitor: I
MON
= I
OUT
/5000
Junction Temperature Monitor: 1μA/°C
Output Adjustable to 0V
50μA SET Pin Current: 1% Initial Accuracy
Output Voltage Noise: 27μV
RMS
Parallel Multiple Devices for Higher Current or Heat Spreading
Part
Number
LT3050
LT3061
LT3042
LT3045
LT3063
LT3055
LT3066
LT3090
LT3089
LT3081
LT3091
LT3086
LT3070
LT3071
V
IN
Min
(V)
1.6
1.6
1.8
1.8
1.6
2
1.8
–36
1.2
1.2
–36
1.4
0.95
0.95
V
IN
Max
(V)
45
45
20
20
45
45
45
–1.5
36
36
–1.5
40
3
3
Output
Current
(A)
0.1
0.1
0.2
0.5
0.2
0.5
0.5
0.6
0.8
1.5
1.5
2.1
5
5
Output
Voltage
Adj, 3.3, 5
Adj
Adj
Adj
Adj
Adj
Adj
–Adj
Adj
Adj
–Adj
Adj
Adj
Adj
Dropout
Voltage
(V) Typ
0.34
0.25
0.35
0.26
0.3
0.35
0.3
0.3
1.47
1.21
0.3
0.33
0.085
0.085
Output Current Monitor, Shutdown
Active Output Discharge, Shutdown
Features
Packages
3 × 2 DFN-12, MSOP-12E
2 × 3 DFN-8, MSOP-8E
3 × 3 DFN-10, MSOP-10E
3 × 3 DFN-10, MSOP-12E
2 × 3 DFN-8, MSOP-8E
4 × 3 DFN-16, MSOP-16E
4 × 3 DFN-12, MSOP-12E
3 × 3 DFN-10, MSOP-12E
4 × 4 DFN-12, DDPAK-7, TSSOP-16E
4 × 4 DFN-12, DDPAK-7, TO-220, TSSOP-16E
4 × 3 DFN-14, DDPAK-7, TO-220, TSSOP-16E
5 × 4 DFN-16, DDPAK-7, TO-220, TSSOP-16E
4 × 5 QFN-28
4 × 5 QFN-28
Ultralow Noise, Ultrahigh PSRR, Current Source Reference, Output Current
Monitor, Power Good, Shutdown
Ultralow Noise, Ultrahigh PSRR, Current Source Reference, Output Current
Monitor, Power Good, Shutdown
Active Output Discharge, Shutdown
Power Good, Output Current Monitor, Temperature Monitor, Shutdown
Active Output Discharge, Shutdown
Current Source Reference, Output Current Monitor, Cable Drop Compensation, Shutdown
Current Source Reference, Cable Drop Compensation, Temperature Monitor,
Output Current Monitor
Current Source Reference, Cable Drop Compensation, Temperature Monitor,
Output Current Monitor
Current Source Reference, Cable Drop Compensation, Output Current Monitor, Shutdown
Current Source Reference, Power Good, Output Current Monitor, Temperature
Monitor, Cable Drop Compensation, Shutdown
Digitally Programmable, Margining, Separate Bias Pin, Power Good
Digitally Programmable, Margining, Separate Bias Pin, Power Good, Output
Current Monitor
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