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PDF LT1962 Data sheet ( Hoja de datos )
| Número de pieza | LT1962 | |
| Descripción | 300mA/ Low Noise/ Micropower LDO Regulators | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1962 Series
300mA, Low Noise,
Micropower
LDO Regulators
Features
nn Low Noise: 20µVRMS (10Hz to 100kHz)
nn Output Current: 300mA
nn Low Quiescent Current: 30µA
nn Wide Input Voltage Range: 1.8V to 20V
nn Low Dropout Voltage: 270mV
nn Very Low Shutdown Current: < 1µA
nn No Protection Diodes Needed
nn Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V
nn Adjustable Output from 1.22V to 20V
nn Stable with 3.3µF Output Capacitor
nn Stable with Aluminum, Tantalum or
Ceramic Capacitors
nn Reverse Battery Protection
nn No Reverse Current
nn Overcurrent and Overtemperature Protected
nn 8-Lead MSOP Package
Applications
nn Cellular Phones
nn Battery-Powered Systems
nn Noise-Sensitive Instrumentation Systems
Description
The LT®1962 series are micropower, low noise, low dropout
regulators. The devices are capable of supplying 300mA
of output current with a dropout voltage of 270mV. De-
signed for use in battery-powered systems, the low 30µA
quiescent current makes them an ideal choice. Quiescent
current is well controlled; it does not rise in dropout as it
does with many other regulators.
A key feature of the LT1962 regulators is low output noise.
With the addition of an external 0.01µF bypass capacitor,
output noise drops to 20µVRMS over a 10Hz to 100kHz
bandwidth. The LT1962 regulators are stable with output
capacitors as low as 3.3µF. Small ceramic capacitors can
be used without the series resistance required by other
regulators.
Internal protection circuitry includes reverse battery protec-
tion, current limiting, thermal limiting and reverse current
protection. The parts come in fixed output voltages of 1.5V,
1.8V, 2.5V, 3V, 3.3V and 5V, and as an adjustable device
with a 1.22V reference voltage. The LT1962 regulators are
available in the 8-lead MSOP package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Typical Application
VIN
3.7V TO
20V
3.3V Low Noise Regulator
IN OUT
1µF SENSE
3.3V AT 300mA
+ 20µVRMS NOISE
10µF
LT1962-3.3
0.01µF
SHDN
BYP
GND
1962 TA01
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
50 100 150 200 250 300
LOAD CURRENT (mA)
1962 TA02
For more information www.linear.com/LT1962
1962fba
1
1 page  
Typical Performance Characteristics
LT1962 Series
Quiescent Current
50
45
40
35
30
25
20
15 VIN = 6V
10
VRSLH=D∞N =,
VIN
IL =
0
(LT1962-1.5/-1.8
5 /2.5/-3/-3.3/-5)
0 RL = 250k, IL = 5µA (LT1962)
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
1962 G04
LT1962-1.5 Output Voltage
1.532 IL = 1mA
1.524
1.516
1.508
1.500
1.492
1.484
1.476
1.468
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1962 G05
LT1962-1.8 Output Voltage
1.836 IL = 1mA
1.827
1.818
1.809
1.800
1.791
1.782
1.773
1.764
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1962 G06
LT1962-2.5 Output Voltage
2.54 IL = 1mA
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1962 G07
LT1962-3 Output Voltage
3.060 IL = 1mA
3.045
3.030
3.015
3.000
2.985
2.970
2.955
2.940
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1962 G08
LT1962-3.3 Output Voltage
3.360 IL = 1mA
3.345
3.330
3.315
3.300
3.285
3.270
3.255
3.240
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1962 G09
LT1962-5 Output Voltage
5.100 IL = 1mA
5.075
5.050
5.025
5.000
4.975
4.950
4.925
4.900
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1962 G10
LT1962 ADJ Pin Voltage
1.240 IL = 1mA
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1962 G11
For more information www.linear.com/LT1962
LT1962-1.5 Quiescent Current
800
700
TJ
RL
=
=
2∞5°C
600
500
400
300
200
VSHDN = 0V
100 VSHDN = VIN
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
1962 G12
1962fba
5
5 Page 
LT1962 Series
Pin Functions
OUT (Pin 1): Output. The output supplies power to the
load. A minimum output capacitor of 3.3µF is required
to prevent oscillations. Larger output capacitors will be
required for applications with large transient loads to limit
peak voltage transients. See the Applications Information
section for more information on output capacitance and
reverse output characteristics.
SENSE (Pin 2): Sense. For fixed voltage versions of the
LT1962 (LT1962-1.5/LT1962-1.8/LT1962-2.5/LT1962-3/
LT1962-3.3/LT1962-5), the SENSE pin is the input to the
error amplifier. Optimum regulation will be obtained at the
point where the SENSE pin is connected to the OUT pin of
the regulator. In critical applications, small voltage drops
are caused by the resistance (RP) of PC traces between
the regulator and the load. These may be eliminated by
connecting the SENSE pin to the output at the load as
shown in Figure 1 (Kelvin Sense Connection). Note that
the voltage drop across the external PC traces will add to
the dropout voltage of the regulator. The SENSE pin bias
current is 10µA at the nominal rated output voltage. The
SENSE pin can be pulled below ground (as in a dual supply
system where the regulator load is returned to a negative
supply) and still allow the device to start and operate.
+
VIN
8 IN
OUT 1 RP
LT1962
5 SHDN SENSE 2
+
GND
4
RP
LOAD
1962 F01
Figure 1. Kelvin Sense Connection
ADJ (Pin 2): Adjust. For the adjustable LT1962, this is the
input to the error amplifier. This pin is internally clamped
to ± 7V. It has a bias current of 30nA which flows into the
pin. The ADJ pin voltage is 1.22V referenced to ground
and the output voltage range is 1.22V to 20V.
BYP (Pin 3): Bypass. The BYP pin is used to bypass the
reference of the LT1962 to achieve low noise performance
from the regulator. The BYP pin is clamped internally to
±0.6V (one VBE). A small capacitor from the output to
this pin will bypass the reference to lower the output volt-
age noise. A maximum value of 0.01µF can be used for
reducing output voltage noise to a typical 20µVRMS over
a 10Hz to 100kHz bandwidth. If not used, this pin must
be left unconnected.
GND (Pin 4): Ground.
SHDN (Pin 5): Shutdown. The SHDN pin is used to put
the LT1962 regulators into a low power shutdown state.
The output will be off when the SHDN pin is pulled low.
The SHDN pin can be driven either by 5V logic or open-
collector logic with a pull-up resistor. The pull-up resistor is
required to supply the pull-up current of the open-collector
gate, normally several microamperes, and the SHDN pin
current, typically 1µA. If unused, the SHDN pin must be
connected to VIN. The device will not function if the SHDN
pin is not connected.
NC (Pins 6, 7): No Connect. These pins are not internally
connected. For improved power handling capabilities,
these pins can be connected to the PC board.
IN (Pin 8): Input. Power is supplied to the device through
the IN pin. A bypass capacitor is required on this pin if
the device is more than six inches away from the main
input filter capacitor. In general, the output impedance
of a battery rises with frequency, so it is advisable to
include a bypass capacitor in battery-powered circuits. A
bypass capacitor in the range of 1µF to 10µF is sufficient.
The LT1962 regulators are designed to withstand reverse
voltages on the IN pin with respect to ground and the OUT
pin. In the case of a reverse input, which can happen if
a battery is plugged in backwards, the device will act as
if there is a diode in series with its input. There will be
no reverse current flow into the regulator and no reverse
voltage will appear at the load. The device will protect both
itself and the load.
For more information www.linear.com/LT1962
1962fba
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LT1962.PDF ] | |
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