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PDF LT3010-5 Data sheet ( Hoja de datos )
| Número de pieza | LT3010-5 | |
| Descripción | Low Dropout Micropower Linear Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT3010/LT3010-5
50mA, 3V to 80V
Low Dropout
Micropower Linear Regulator
FEATURES
s Wide Input Voltage Range: 3V to 80V
s Low Quiescent Current: 30µA
s Low Dropout Voltage: 300mV
s Output Current: 50mA
s Thermally Enhanced 8-Lead MSOP Package
s No Protection Diodes Needed
s Fixed Output Voltage: 5V (LT3010-5)
s Adjustable Output from 1.275V to 60V (LT3010)
s 1µA Quiescent Current in Shutdown
s Stable with 1µF Output Capacitor
s Stable with Aluminum, Tantalum or Ceramic
Capacitors
s Reverse-Battery Protection
s No Reverse Current Flow from Output
s Thermal Limiting
U
APPLICATIO S
s Low Current High Voltage Regulators
s Regulator for Battery-Powered Systems
s Telecom Applications
s Automotive Applications
DESCRIPTIO
The LT®3010 is a high voltage, micropower low dropout
linear regulator. The device is capable of supplying 50mA
output current with a dropout voltage of 300mV. Designed
for use in battery-powered or high voltage systems, the
low quiescent current (30µA operating and 1µA in shut-
down) makes the LT3010 an ideal choice. Quiescent
current is also well controlled in dropout.
Other features of the LT3010 include the ability to operate
with very small output capacitors. The regulators are
stable with only 1µF 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 in a fixed output voltage of 5V and
as an adjustable device with a 1.275V reference voltage.
The LT3010 regulator is available in the 8-lead MSOP
package with an exposed pad for enhanced thermal han-
dling capability.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V Supply with Shutdown
VIN
5.4V TO
80V
IN OUT
LT3010-5
1µF
SHDN SENSE
GND
VSHDN (PIN 5)
<0.3V
>2.0V
NC
OUTPUT
OFF
ON
ON
3010 TA01
VOUT
5V
50mA
1µF
350
300
250
200
150
100
50
0
0
Dropout Voltage
10 20 30 40
OUTPUT CURRENT (mA)
50
3010 TA02
3010f
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
SHDN Pin Current
0.6
TJ = 25°C
CURRENT FLOWS
0.5 OUT OF SHDN PIN
0.4
0.3
0.2
0.1
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
SHDN PIN VOLTAGE (V)
3010 G13
Current Limit
200
VOUT = 0V
180 TJ = 25°C
160
140
120
100
80
60
40
20
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (V)
3010 G16
Reverse Output Current
24
VIN = 0V
21 VOUT = VADJ = 1.275V (LT3010)
VOUT = VSENSE = 5V (LT3010-5)
18
15
12
LT3010-5
9
LT3010
6
3
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3010 G19
SHDN Pin Current
0.8
VSHDN = 0V
0.7
CURRENT FLOWS
OUT OF SHDN PIN
0.6
0.5
0.4
0.3
0.2
0.1
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3010 G14
Current Limit
200
VIN = 7V
180 VOUT = 0V
160
140
120
100
80
60
40
20
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3010 G17
Input Ripple Rejection
80
78
76
74
72
70
68
66
64 VIN = 7V + 0.5VP-P RIPPLE AT f = 120Hz
62 IL = 50mA
VOUT = 1.275V
60
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
125
3010 G20
LT3010/LT3010-5
ADJ Pin Bias Current
80
70
60
50
40
30
20
10
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3010 G15
Reverse Output Current
100
TJ = 25°C
90 VIN = 0V
80
CURRENT FLOWS
INTO OUTPUT PIN
70 VOUT = VADJ (LT3010)
60
VOUT = VSENSE
(LT3010-5)
ADJ
PIN CLAMP
50 (SEE APPLICATIONS
40
LT3010
30
INFORMATION)
20 LT3010-5
10
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT VOLTAGE (V)
3010 G18
Input Ripple Rejection
100
VIN = 7V + 50mVRMS RIPPLE
90 IL = 50mA
80
70
60 COUT = 10µF
50
40
COUT = 1µF
30
20
10
0
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
3010 G21
3010f
5
5 Page 
LT3010/LT3010-5
APPLICATIO S I FOR ATIO
The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature or:
TJMAX = 50°C + 65.5°C = 115.5°C
Example 2: Given an output voltage of 5V, an input voltage
of 48V that rises to 72V for 5ms(max) out of every 100ms,
and a 5mA load that steps to 50mA for 50ms out of every
250ms, what is the junction temperature rise above ambi-
ent? Using a 500ms period (well under the time constant
of the board), power dissipation is as follows:
P1(48V in, 5mA load) = 5mA • (48V – 5V)
+ (200µA • 48V) = 0.23W
P2(48V in, 50mA load) = 50mA • (48V – 5V)
+ (1mA • 48V) = 2.20W
P3(72V in, 5mA load) = 5mA • (72V – 5V)
+ (200µA • 72V) = 0.35W
P4(72V in, 50mA load) = 50mA • (72V – 5V)
+ (1mA • 72V) = 3.42W
Operation at the different power levels is as follows:
76% operation at P1, 19% for P2, 4% for P3, and
1% for P4.
PEFF = 76%(0.23W) + 19%(2.20W) + 4%(0.35W)
+ 1%(3.42W) = 0.64W
With a thermal resistance in the range of 40°C/W to
62°C/W, this translates to a junction temperature rise
above ambient of 26°C to 38°C.
Protection Features
The LT3010 incorporates several protection features which
make it ideal for use in battery-powered circuits. In addi-
tion to the normal protection features associated with
monolithic regulators, such as current limiting and ther-
mal limiting, the device is protected against reverse-input
voltages, and reverse voltages from output to input.
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal opera-
tion, the junction temperature should not exceed 125°C.
The input of the device will withstand reverse voltages of
80V. Current flow into the device will be limited to less than
6mA (typically less than 100µA) and no negative voltage
will appear at the output. The device will protect both itself
and the load. This provides protection against batteries
which can be plugged in backward.
The ADJ pin of the adjustable device can be pulled above
or below ground by as much as 7V without damaging the
device. If the input is left open circuit or grounded, the ADJ
pin will act like an open circuit when pulled below ground,
and like a large resistor (typically 100k) in series with a
diode when pulled above ground. If the input is powered
by a voltage source, pulling the ADJ pin below the refer-
ence voltage will cause the device to try and force the
current limit current out of the output. This will cause the
output to go to a unregulated high voltage. Pulling the ADJ
pin above the reference voltage will turn off all output
current.
3010f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT3010-5.PDF ] | |
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