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PDF LT3062 Data sheet ( Hoja de datos )
| Número de pieza | LT3062 | |
| Descripción | 200mA LDO | |
| Fabricantes | Linear | |
| Logotipo |  |
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LT3062
45V VIN, Micropower,
Low Noise, 200mA LDO
Features
n Input Voltage Range: 1.6V to 45V
n Output Current: 200mA
n Quiescent Current: 45µA
n Dropout Voltage: 300mV
n Low Noise: 30µVRMS (10Hz to 100kHz)
n Adjustable Output (VREF = 600mV)
n Output Tolerance: ±2% Over Load, Line, and
Temperature
n Single Capacitor Soft-Starts Reference and Lowers
Output Noise
n Shutdown Current: < 1µA
n Reverse Battery Protection
n Current Limit Foldback and Thermal Limit Protection
n 8-Lead 2mm × 3mm DFN and MSOP Packages
Applications
n Battery Powered Systems
n Automotive Power Supplies
n Industrial Power Supplies
n Avionic Power Supplies
n Portable Instruments
Description
The LT®3062 is a micropower, low dropout (LDO) linear
regulator that operates over a 1.6V to 45V supply range.
The device supplies 200mA of output current with a typi-
cal dropout voltage of 300mV. A single external capacitor
provides programmable low noise reference performance
and output soft-start functionality. The LT3062’s quiescent
current is merely 45μA and provides fast transient response
with a minimum 3.3μF output capacitor. In shutdown,
quiescent current is less than 1μA and the reference soft
start capacitor is reset.
The LT3062 optimizes stability and transient response
with low ESR, ceramic output capacitors. The LT3062
does not require the addition of ESR as is common with
other regulators.
Internal protection circuitry includes reverse-battery pro-
tection, reverse-output protection, reverse-current protec-
tion, current limit with foldback and thermal shutdown.
The LT3062 is available as an adjustable device with an
output voltage range from the 600mV reference up to 40V.
The LT3062 is offered in the thermally enhanced 8-lead
2mm × 3mm DFN and MSOP packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Typical Application
1.8V Low Noise Regulator
IN OUT
VOUT
1.8V
VIN
2.3V
1µF
LT3062
118k
1%
200mA
10µF
SHDN
ADJ
GND BYP
59k
1%
0.01µF
3062 TA01
550
500
450
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
TJ = 25°C
25 50 75 100 125 150 175 200
OUTPUT CURRENT (mA)
3062 TA01a
For more information www.linear.com/LT3062
3062f
1
1 page  
LT3062
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Typical Dropout Voltage
550
500
450 TJ = 150°C
400
350 TJ = 125°C
300
250 TJ = 25°C
200
150
100
50
0
0 25 50 75 100 125 150 175 200
OUTPUT CURRENT (mA)
3062 G01
Quiescent Current
80
70
60 VIN = VSHDN = 6V
VOUT = 5V
50 IL = 10µA
40
30
20
10 VIN = 6V
ALL OTHER PINS = 0V
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3062 G04
GND Pin Current, VOUT = 0.6V
5.0
4.5 RL = 3Ω, IL = 200mA
4.0
3.5
3.0
2.5
2.0 RL = 6Ω, IL = 100mA
1.5
1.0 RL = 12Ω, IL = 50mA
0.5 RL = 600Ω, IL = 1mA
0
0 1 2 3 4 5 6 7 8 9 10
VIN (V)
3063 G07
Guaranteed Dropout Voltage
550 = TEST POINTS
500 TJ = 150°C
450
400
350 TJ = 25°C
300
250
200
150
100
50
0
0 25 50 75 100 125 150 175 200
OUTPUT CURRENT (mA)
3062 G02
ADJ Pin Voltage
612
610
IL = 1mA
608
606
604
602
600
598
596
594
592
590
588
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3062 G05
GND Pin Current vs ILOAD
10
9
VIN = VOUT(NOMINAL) +1V
8
7
6
5
4
3
2
1
0
0 25 50 75 100 125 150 175 200
ILOAD (mA)
3062 G08
For more information www.linear.com/LT3062
Dropout Voltage
550
500
450 IL = 200mA
400
350
IL = 100mA
300
250 IL = 50mA
200
150 IL = 10mA
100
50
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3062 G03
Quiescent Current
120
110
TJ = 25°C
VOUT = 5V
100 IL = 10µA
90
80
70
60
50
40
30
20
10 VSHDN = 0V, RL = 0
0
0 5 10 15 20 25 30 35 40 45
VIN (V)
3062 G06
SHDN Pin Threshold
1.5
1.4
1.3
1.2
1.1
1.0
0.9 OFF TO ON
0.8
0.7
0.6 ON TO OFF
0.5
0.4
0.3
0.2
0.1
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3062 G09
3062f
5
5 Page 
LT3062
Applications Information
Bypass Capacitance, Output Voltage Noise and
Transient Response
The LT3062 regulator provides low output voltage noise
over the 10Hz to 100kHz bandwidth while operating at full
load with the addition of a bypass capacitor (CREF/BYP)
from the REF/BYP pin to GND. A good quality low leak-
age capacitor is recommended. This capacitor bypasses
the reference of the regulator, providing a low frequency
noise pole for the internal reference. With the use of 10nF
for CREF/BYP, the output voltage noise decreases to as
low as 30µVRMS when the output voltage is set for 0.6V.
For higher output voltages (generated by using a resistor
divider), the output voltage noise gains up accordingly
when using CREF/BYP by itself.
To lower the output voltage noise for higher output volt-
ages, include a feedforward capacitor (CFF) from VOUT
to the ADJ pin. A good quality, low leakage capacitor is
recommended. This capacitor bypasses the error amplifier
of the regulator, providing a low frequency noise pole. With
the use of 10nF for both CFF and CREF/BYP, output voltage
noise decreases to 30µVRMS when the output voltage is
set to 5V by a 10µA feedback resistor divider. If the cur-
rent in the feedback resistor divider is doubled, CFF must
also be doubled to achieve equivalent noise performance.
Higher values of output voltage noise may be measured
if care is not exercised with regard to circuit layout and
testing. Crosstalk from nearby traces can induce unwanted
noise onto the LT3062’s output. Power supply ripple rejec-
tion must also be considered. The LT3062 regulator does
not have unlimited power supply rejection and will pass
a small portion of the input noise through to the output.
Using a feedforward capacitor (CFF) from VOUT to the ADJ
pin has the added benefit of improving transient response
for output voltages greater than 0.6V. With no feedforward
capacitor, the settling time will increase as the output
voltage is raised above 0.6V. Use the equation in Figure 2
to determine the minimum value of CFF to achieve a
transient response that is similar to 0.6V output voltage
performance regardless of the chosen output voltage (see
Figure 3 and Transient Response in the Typical Performance
Characteristics section).
IN OUT
VOUT
VIN LT3062 R2 CFF COUT
SHDN ADJ
GND REF/BYP
R1
CREF/BYP
3062 F02
( )CFF
≥
10nF
10µA•
I FB–DIVIDER
I FB–DIVIDER
=
VOUT
R1+ R2
Figure 2. Feedforward Capacitor for Fast Transient Response
VOUT = 5V
COUT = 10µF
0 IFB-DIVIDER = 10µA
10pF
1nF
10nF
LOAD CURRENT
200mA/DIV
100µs/DIV
3062 F03
Figure 3. Transient Response vs Feedforward Capacitor
For more information www.linear.com/LT3062
3062f
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT3062.PDF ] | |
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