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PDF LT3013 Data sheet ( Hoja de datos )
| Número de pieza | LT3013 | |
| Descripción | 4V to 80V Low Dropout Micropower Linear Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT3013
250mA, 4V to 80V
Low Dropout Micropower
Linear Regulator with PWRGD
FEATURES
■ Wide Input Voltage Range: 4V to 80V
■ Low Quiescent Current: 65μA
■ Low Dropout Voltage: 400mV
■ Output Current: 250mA
■ No Protection Diodes Needed
■ Adjustable Output from 1.24V to 60V
■ 1μA Quiescent Current in Shutdown
■ Stable with 3.3μF Output Capacitor
■ Stable with Aluminum, Tantalum or Ceramic
Capacitors
■ Reverse-Battery Protection
■ No Reverse Current Flow from Output to Input
■ Thermal Limiting
■ Thermally Enhanced 16-Lead TSSOP and
12-Pin (4mm × 3mm) DFN Package
APPLICATIONS
■ Low Current High Voltage Regulators
■ Regulator for Battery-Powered Systems
■ Telecom Applications
■ Automotive Applications
DESCRIPTION
The LT®3013 is a high voltage, micropower low dropout
linear regulator. The device is capable of supplying 250mA
of output current with a dropout voltage of 400mV. Designed
for use in battery-powered or high voltage systems, the low
quiescent current (65μA operating and 1μA in shutdown)
makes the LT3013 an ideal choice. Quiescent current is
also well controlled in dropout.
Other features of the LT3013 include a PWRGD flag to
indicate output regulation. The delay between regulated
output level and flag indication is programmable with a
single capacitor. The LT3013 also has the ability to operate
with very small output capacitors. The regulator is stable
with only 3.3μF on the output while most older devices
require between 10μF and 100μF for stability. Small ce-
ramic capacitors can be used without any need for series
resistance (ESR) as is common with other regulators.
Internal protection circuitry includes reverse-battery
protection, current limiting, thermal limiting and reverse
current protection.
The device is available with an adjustable output with a
1.24V reference voltage. The LT3013 regulator is available
in the thermally enhanced 16-lead TSSOP and the low
profile (0.75mm), 12-pin (4mm × 3mm) DFN package,
both providing excellent thermal characteristics.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
5V Supply with Shutdown
VIN
5.4V TO
80V
1µF 1.6M
VSHDN
<0.3V
>2.0V
OUTPUT
OFF
ON
IN OUT
LT3013
SHDN ADJ
PWRGD
GND CT
750k
249k
VOUT
5V
250mA
3.3µF
1000pF
3013 TA01
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
50 100 150 200 250
OUTPUT CURRENT (mA)
3013 TA02
3013fc
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TYPICAL PERFORMANCE CHARACTERISTICS
LT3013
Typical Dropout Voltage
600
500 TJ = 125°C
400
300 TJ = 25°C
200
100
0
0 50 100 150 200 250
OUTPUT CURRENT (mA)
3013 G01
Guaranteed Dropout Voltage
600
= TEST POINTS
TJ ≤ 125°C
500
400
TJ ≤ 25°C
300
200
100
0
0 50 100 150 200 250
OUTPUT CURRENT (mA)
3013 G02
Dropout Voltage
600
500
IL = 250mA
400 IL = 100mA
300 IL = 50mA
200 IL = 10mA
100 IL = 1mA
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3013 G03
Quiescent Current
120
VIN = 6V
RL = ∞
100 IL = 0
VSHDN = VIN
80
60
40
20
0
–50 –25
VSHDN = GND
0 25 50 75 100 125 150
TEMPERATURE (°C)
3013 G04
ADJ Pin Voltage
1.260
IL = 1mA
1.255
1.250
1.245
1.240
1.235
1.230
1.225
1.220
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3013 G05
3013fc
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LT3013
PIN FUNCTIONS (DFN Package)/(TSSOP Package)
NC (Pins 1, 9, 12)/(Pins 2, 12, 15): No Connect. These
pins have no internal connection; connecting NC pins to a
copper area for heat dissipation provides a small improve-
ment in thermal performance.
OUT (Pins 2, 3)/(Pins 3, 4): Output. The output supplies
power to the load. A minimum output capacitor of 3.3μF
is required to prevent oscillations. Larger output capaci-
tors will be required for applications with large transient
loads to limit peak voltage transients. See the Applications
Information section for more information on output ca-
pacitance and reverse output characteristics.
ADJ (Pin 4)/(Pin 5): Adjust. 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 (see curve
of ADJ Pin Bias Current vs Temperature in the Typical
Performance Characteristics). The ADJ pin voltage is
1.24V referenced to ground, and the output voltage range
is 1.24V to 60V.
GND (Pins 5, 13)/(Pins 1, 6, 8, 9, 16, 17): Ground. The
exposed backside of the package is an electrical connection
for GND. As such, to ensure optimum device operation and
thermal performance, the exposed pad must be connected
directly to pin 5/pin 6 on the PC board.
PWRGD (Pin 6)/(Pin 7): Power Good. The PWRGD flag is
an open collector flag to indicate that the output voltage
has come up to above 90% of the nominal output voltage.
There is no internal pull-up on this pin; a pull-up resistor
must be used. The PWRGD pin will change state from an
open-collector to high impedance after both the output is
above 90% of the nominal voltage and the capacitor on
the CT pin has charged through a 1.6V differential. The
maximum pull-down current of the PWRGD pin in the
low state is 50μA.
⎯S⎯H⎯D⎯N (Pin 8)/(Pin 11): Shutdown. The ⎯S⎯H⎯D⎯N pin is used
to put the LT3013 into a low power shutdown state. The
output will be off when the ⎯S⎯H⎯D⎯N pin is pulled low. The
S⎯ H⎯ D⎯ N⎯ pin can be driven either by 5V logic or open-collector
logic with a pull-up resistor. The pull-up resistor is only
required to supply the pull-up current of the open-collec-
tor gate, normally several microamperes. If unused, the
⎯S⎯H⎯D⎯N pin must be tied to a logic high or VIN.
CT (Pin 7)/(Pin 10): Timing Capacitor. The CT pin allows
the use of a small capacitor to delay the timing between
the point where the output crosses the PWRGD thresh-
old and the PWRGD flag changes to a high impedance
state. Current out of this pin during the charging phase
is 3μA. The voltage difference between the PWRGD low
and PWRGD high states is 1.6V (see the Applications
Information Section).
IN (Pins 10, 11)/(Pins 13,14): 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 LT3013 is designed to withstand reverse
voltages on the IN pin with respect to ground and the OUT
pin. In the case of a reversed input, which can happen if
a battery is plugged in backwards, the LT3013 will act as
if there is a diode in series with its input. There will be no
reverse current flow into the LT3013 and no reverse volt-
age will appear at the load. The device will protect both
itself and the load.
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT3013.PDF ] | |
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