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PDF LT3014 Data sheet ( Hoja de datos )
| Número de pieza | LT3014 | |
| Descripción | 3V to 80V Low Dropout Micropower Linear Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Wide Input Voltage Range: 3V to 80V
■ Low Quiescent Current: 7µA
■ Low Dropout Voltage: 350mV
■ Output Current: 20mA
■ LT3014HV Survives 100V Transients (2ms)
■ No Protection Diodes Needed
■ Adjustable Output from 1.22V to 60V
■ 1µA Quiescent Current in Shutdown
■ Stable with 0.47µF Output Capacitor
■ Stable with Aluminum, Tantalum or Ceramic
Capacitors
■ Reverse-Battery Protection
■ No Reverse Current Flow from Output
■ Thermal Limiting
■ Available in 5-Lead ThinSOTTM and
8-Lead DFN Packages
U
APPLICATIO S
■ Low Current High Voltage Regulators
■ Regulator for Battery-Powered Systems
■ Telecom Applications
■ Automotive Applications
TYPICAL APPLICATIO
5V Supply with Shutdown
VIN
5.4V TO
80V
IN OUT
LT3014
3.92M
1µF
SHDN ADJ
GND 1.27M
VOUT
5V
20mA
0.47µF
VSHDN OUTPUT
<0.3V OFF
>2.0V ON
3014 TA01
LT3014
20mA, 3V to 80V
Low Dropout Micropower
Linear Regulator
DESCRIPTIO
The LT®3014 is a high voltage, micropower low dropout
linear regulator. The device is capable of supplying 20mA
of output current with a dropout voltage of 350mV. De-
signed for use in battery-powered or high voltage sys-
tems, the low quiescent current (7µA operating and 1µA in
shutdown) makes the LT3014 an ideal choice. Quiescent
current is also well controlled in dropout.
Other features of the LT3014 include the ability to operate
with very small output capacitors. The regulators are
stable with only 0.47µF on the output while most older
devices require between 10µF and 100µF for stability.
Small ceramic capacitors can be used without the neces-
sary addition of ESR as is common with other regulators.
Internal protection circuitry includes reverse-battery pro-
tection, current limiting, thermal limiting and reverse
current protection.
The device is available as an adjustable device with a 1.22V
reference voltage. The LT3014 regulator is available in the
5-lead ThinSOT and 8-lead DFN packages.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6118263, 6144250.
Dropout Voltage
400
350
300
250
200
150
100
50
0
0 2 4 6 8 10 12 14 16 18 20
OUTPUT CURRENT (mA)
3014 TA02
3014fb
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TYPICAL PERFOR A CE CHARACTERISTICS
SHDN Pin Current
1.2
TJ = 25°C
CURRENT FLOWS
1.0 OUT OF SHDN PIN
0.8
0.6
0.4
0.2
0
0 0.5 1 1.5 2 2.5 3 3.5 4
SHDN PIN VOLTAGE (V)
3014 G10
Current Limit
80
VOUT = 0V
70 TJ = 25°C
60
50
40
30
20
10
0
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
3014 G13
Reverse Output Current
8
VIN = 0V
7 VOUT = VADJ = 1.22V
6
5
4
3
2
1
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3014 G16
SHDN Pin Current
1.6
VSHDN = 0V
1.4
CURRENT FLOWS
OUT OF SHDN PIN
1.2
1.0
0.8
0.6
0.4
0.2
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3014 G11
Current Limit
100
VIN = 7V
90 VOUT = 0V
80
70
60
50
40
30
20
10
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3014 G14
Input Ripple Rejection
72
VIN = 7V + 0.5VP-P
70 RIPPLE AT f = 120Hz
IL = 20mA
68
66
64
62
60
58
56
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3014 G17
LT3014
ADJ Pin Bias Current
14
12
10
8
6
4
2
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3014 G12
Reverse Output Current
50
TJ = 25°C
45 VIN = 0V
40 VOUT = VADJ
ADJ PIN
ESD CLAMP
35
30
25
20 CURRENT FLOWS
15 INTO OUTPUT PIN
10
5
0
012345678
OUTPUT VOLTAGE (V)
9 10
3014 G15
Input Ripple Rejection
80
VIN = 7V + 50mVRMS RIPPLE
70 IL = 20mA
60
50
40 COUT = 4.7µF
30
20
10 COUT = 0.47µF
0
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
3014 G18
3014fb
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LT3014
APPLICATIO S I FOR ATIO
In situations where the ADJ pin is connected to a resistor
divider that would pull the ADJ pin above its 7V clamp
voltage if the output is pulled high, the ADJ pin input
current must be limited to less than 5mA. For example, a
resistor divider is used to provide a regulated 1.5V output
from the 1.22V reference when the output is forced to 60V.
The top resistor of the resistor divider must be chosen to
limit the current into the ADJ pin to less than 5mA when the
ADJ pin is at 7V. The 53V difference between the OUT and
ADJ pins divided by the 5mA maximum current into the
ADJ pin yields a minimum top resistor value of 10.6k.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to
ground, pulled to some intermediate voltage, or is left
open circuit. Current flow back into the output will follow
the curve shown in Figure 4. The rise in reverse output
current above 7V occurs from the breakdown of the 7V
clamp on the ADJ pin. With a resistor divider on the
regulator output, this current will be reduced depending
on the size of the resistor divider.
When the IN pin of the LT3014 is forced below the OUT pin
or the OUT pin is pulled above the IN pin, input current will
typically drop to less than 2µA. This can happen if the input
of the LT3014 is connected to a discharged (low voltage)
battery and the output is held up by either a backup battery
or a second regulator circuit. The state of the SHDN pin will
have no effect on the reverse output current when the
output is pulled above the input.
50
TJ = 25°C
45 VIN = 0V
40 VOUT = VADJ
35
ADJ PIN
ESD CLAMP
30
25
20 CURRENT FLOWS
15 INTO OUTPUT PIN
10
5
0
01
23 45 678
OUTPUT VOLTAGE (V)
9 10
3014 F04
Figure 4. Reverse Output Current
3014fb
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT3014.PDF ] | |
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