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PDF LT3007 Data sheet ( Hoja de datos )
| Número de pieza | LT3007 | |
| Descripción | Low Dropout Fault Tolerant Linear Regulators | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT3007 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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FEATURES
n FMEA Fault Tolerant:
Output Stays at or Below Regulation Voltage During
Adjacent Pin Short or if a Pin Is Left Floating
n Ultralow Quiescent Current: 3µA
n Input Voltage Range: 2.0V to 45V
n Output Current: 20mA
n Dropout Voltage: 300mV
n Adjustable Output (VADJ = VOUT(MIN) = 600mV)
n Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
n Output Tolerance: ±2% Over Load, Line and
Temperature
n Stable with Low ESR, Ceramic Output Capacitors
(2.2µF Minimum)
n Shutdown Current: <1µA
n Current Limit Protection
n Reverse-Battery Protection
n Thermal Limit Protection
n TSOT-23 Package
APPLICATIONS
n Automotive
n Low Current Battery-Powered Systems
n Keep-Alive Power Supplies
n Remote Monitoring
n Utility Meters
n Low Power Industrial Applications
LT3007 Series
3µA IQ, 20mA, 45V
Low Dropout Fault Tolerant
Linear Regulators
DESCRIPTION
The LT®3007 series are micropower, low dropout voltage
(LDO) linear regulators. The devices supply 20mA output
current with a dropout voltage of 300mV. No-load quies-
cent current is 3µA. Ground pin current remains at less
than 5% of output current as load increases. In shutdown,
quiescent current is less than 1µA.
The LT3007 regulators optimize stability and transient
response with low ESR ceramic capacitors, requiring a
minimum of only 2.2µF. The regulators do not require
the addition of ESR as is common with other regulators.
Internal protection circuitry includes current limiting,
thermal limiting, reverse-battery protection and reverse-
current protection.
The LT3007 series are ideal for applications that require
moderate output drive capability coupled with ultralow
standby power consumption. The device is available in
fixed output voltages of 1.2V, 1.5V, 1.8V, 2.5V, 3.3V and
5V, and an adjustable version with an output voltage range
of 0.6V to 44.5V. The LT3007 is available in the thermally
enhanced 8-lead TSOT-23 package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered and ThinSOT is a
trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
VIN
3.8V TO
45V
3.3V, 20mA Supply with Shutdown
IN OUT
1µF
LT3007-3.3
VOUT
3.3V
2.2µF 20mA
SHDN SENSE
GND
3007 TA01a
Dropout Voltage/Quiescent Current
500 ILOAD = 20mA
450
400
DROPOUT
VOLTAGE
6
5
350 4
300
250 IQ 3
200
150 2
100 1
50
0
–50 –25
0
0 25 50 75 100 125 150
TEMPERATURE (°C)
3007 TA01b
For more information www.linear.com/LT3007
3007fa
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1 page  
LT3007 Series
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Dropout Voltage
450
400
350 TJ = 150°C
300
TJ = 125°C
250 TJ = 25°C
200
150
100
50
0
0 5 10 15 20
OUTPUT CURRENT (mA)
3007 G01
ADJ Pin Voltage
0.612
0.610 ILOAD = 100µA
0.608
0.606
0.604
0.602
0.600
0.598
0.596
0.594
0.592
0.590
0.588
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3007 G04
Output Voltage LT3007-1.8
1.836
1.830
ILOAD = 100µA
1.824
1.816
1.812
1.806
1.800
1.794
1.788
1.782
1.776
1.770
1.764
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3007 G07
Dropout Voltage
450
400
350
300 20mA
250
10mA
200 1mA
150
100µA
100
50
0 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3007 G02
Output Voltage LT3007-1.2
1.224
1.220
ILOAD = 100µA
1.216
1.212
1.208
1.204
1.200
1.196
1.192
1.188
1.184
1.180
1.176
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3007 G05
Output Voltage LT3007-2.5
2.550
2.540
ILOAD = 100µA
2.530
2.520
2.510
2.500
2.490
2.480
2.470
2.460
2.450
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3007 G08
Minimum Input Voltage
2.0
1.8
ILOAD = 20mA
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3007 G03
Output Voltage LT3007-1.5
1.530
1.525
ILOAD = 100µA
1.520
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.480
1.475
1.470
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3007 G06
Output Voltage LT3007-3.3
3.366
3.355 ILOAD = 100µA
3.344
3.333
3.322
3.311
3.300
3.289
3.278
3.267
3.256
3.245
3.234
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3007 G09
For more information www.linear.com/LT3007
3007fa
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5 Page 
LT3007 Series
APPLICATIONS INFORMATION
Output Capacitance and Transient Response
The LT3007 is stable with a wide range of output capaci-
tors. The ESR of the output capacitor affects stability, most
notably with small capacitors. Use a minimum output
capacitor of 2.2µF with an ESR of 3Ω or less to prevent
oscillations. The LT3007 is a micropower device and output
load transient response is a function of output capacitance.
Larger values of output capacitance decrease the peak
deviations and provide improved transient response for
larger load current changes.
Give extra consideration to the use of ceramic capacitors.
Manufacturers make ceramic capacitors with a variety of
dielectrics, each with different behavior across temperature
and applied voltage. The most common dielectrics are
specified with EIA temperature characteristic codes of
Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics
provide high C-V products in a small package at low cost,
but exhibit strong voltage and temperature coefficients as
shown in Figures 3 and 4. When used with a 5V regulator,
a 16V 10µF Y5V capacitor can exhibit an effective value
as low as 1µF to 2µF for the DC bias voltage applied and
over the operating temperature range. The X5R and X7R
dielectrics yield more stable characteristics and are more
suitable for use as the output capacitor. The X7R type has
better stability across temperature, while the X5R is less
expensive and is available in higher values. One must still
exercise care when using X5R and X7R capacitors; the
X5R and X7R codes only specify operating temperature
range and maximum capacitancechange over temperature.
Capacitance change due to DC bias with X5R and X7R
capacitors is better than Y5V and Z5U capacitors, but can
still be significant enough to drop capacitor values below
appropriate levels. Capacitor DC bias characteristics tend
to improve as component case size increases, but expected
capacitance at operating voltage should be verified.
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
similar to the way a piezoelectric accelerometer or micro-
phone works. For a ceramic capacitor, the stress can be
induced by vibrations in the system or thermal transients.
20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
0
X5R
–20
–40
–60
Y5V
–80
–100 0 2 4 6 8 10 12 14 16
DC BIAS VOLTAGE (V)
3007 F03
Figure 3. Ceramic Capacitor DC Bias Characteristics
40
20
0 X5R
–20
–40 Y5V
–60
–80 BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
–100
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3007 F04
Figure 4. Ceramic Capacitor Temperature Characteristics
For more information www.linear.com/LT3007
3007fa
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT3007.PDF ] | |
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