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PDF LT1965 Data sheet ( Hoja de datos )
| Número de pieza | LT1965 | |
| Descripción | Low Dropout Linear Regulator | |
| Fabricantes | Linear | |
| Logotipo |  |
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LT1965 Series
1.1A, Low Noise,
Low Dropout Linear Regulator
Features
Description
n Output Current: 1.1A
n Dropout Voltage: 310mV
n Low Noise: 40µVRMS (10Hz to 100kHz)
n 500µA Quiescent Current (Adjustable Version)
n Wide Input Voltage Range: 1.8V to 20V
n No Protection Diodes Needed
n Controlled Quiescent Current in Dropout
n Adjustable Output from 1.20V to 19.5V
n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
n < 1µA Quiescent Current in Shutdown
n Stable with 10µF Output Capacitor
n Stable with Ceramic or Tantalum Capacitors
n Reverse-Battery Protection
n No Reverse Current
n Current Limit with Foldback Protection
n Thermal Limiting
n 5-Lead TO-220, DD-Pak, Thermally Enhanced 8-Lead
MSOP and 8-Lead 3mm × 3mm DFN Packages
Applications
n Logic Power Supplies
n Post Regulator for Switching Supplies
n Low Noise Instrumentation
The LT®1965 series are low noise, low dropout linear regu-
lators. The devices supply 1.1A of output current with a
310mV typical dropout voltage. Operating quiescent current
is 500µA for the adjustable version, reducing to <1µA in
shutdown. Quiescent current is well controlled; it does not
rise in dropout as with many other regulators. The LT1965
regulators have very low output noise which makes them
ideal for sensitive RF and DSP supply applications.
Output voltage ranges from 1.20V to 19.5V. The LT1965
regulators are stable with output capacitors as low as
10µF. Internal protection circuitry includes reverse-battery
protection, current limiting with foldback, thermal limit-
ing and reverse-current protection. The LT1965 series
are available in fixed output voltages of 1.5V, 1.8V, 2.5V,
3.3V, and as an adjustable device with a 1.20V reference
voltage. The package offerings include the 5-lead TO-220,
5-lead DD-Pak as well as the thermally enhanced 8-lead
MSOP and low profile (0.75mm) 8-lead 3mm × 3mm DFN.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Typical Application
3.3V to 2.5V Regulator
VIN > 3V +
TO 20V
10µF*
IN OUT
LT1965-2.5
SHDN SENSE
GND
1965 TA01
2.5V
+ 1.1A
10µF*
*CERAMIC OR TANTALUM
Dropout Voltage
400
TJ = 25°C
350
300
250
200
150
100
50
0
0 0.2 0.4 0.6 0.8
OUTPUT CURRENT (A)
1 1.2
1965 TA01b
For more information www.linear.com/LT1965
1965fb
1
1 page  
LT1965 Series
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX
SHDN Pin Current (Note 10)
VSHDN = 0V
VSHDN = 20V
0.01 1
5.5 10
Quiescent Current in Shutdown VIN = 6V, VSHDN = 0V
0.01 1
Ripple Rejection
VIN – VOUT = 1.5V (AVG), VRIPPLE = 0.5VP-P,
fRIPPLE = 120Hz, ILOAD = 0.75A
57 75
Current Limit
VIN = 7V, VOUT = 0
VIN = VOUT(NOMINAL) + 1V, ∆VOUT = –0.1V (TJ < 125°C) (Note 6)
VIN = VOUT(NOMINAL) + 1V, ∆VOUT = –0.1V, (H-Grade, TJ > 125°C) (Note 6)
l
1.2
1.1
2.4
Input Reverse-Leakage Current VIN = –20V, VOUT = 0
1
Reverse-Output Current (Note 11) LT1965-1.5, VOUT = 1.5V, VIN = 0
LT1965-1.8, VOUT = 1.8V, VIN = 0
LT1965-2.5,
LT1965-3.3,
VVOOUUTT
=
=
2.5V,
3.3V,
VVIINN
=
=
0
0
LT1965 (Note 4), VOUT = 1.2V, VIN = 0
275 525
275 525
275 525
275 525
175 400
UNITS
µA
µA
µA
dB
A
A
A
mA
µA
µA
µA
µA
µA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Absolute maximum input to output differential voltage is not
achievable with all combinations of rated IN pin and OUT pin voltages.
With the IN pin at 22V, the OUT pin may not be pulled below 0V. The total
measured voltage from IN to OUT must not exceed ±22V.
Note 3: The LT1965 regulators are tested and specified under pulse
load conditions such that TJ @ TA. The LT1965E regulators are 100%
tested at TA = 25°C and performance is guaranteed from 0°C to 125°C.
Performance of the LT1965E over the full –40°C to 125°C operating
junction temperature range is assured by design, characterization and
correlation with statistical process controls. The LT1965I regulators are
guaranteed over the full –40°C to 125°C operating junction temperature
range. The LT1965H is tested at 150°C operating junction temperature.
High junction temperatures degrade operating lifetimes. Operating lifetime
is derated at junction temperatures greater than 125°C.
Note 4: The LT1965 adjustable version is tested and specified for these
conditions with the ADJ connected to the OUT pin.
Note 5: Maximum junction temperature limits operating conditions. The
regulated output voltage specification does not apply for all possible
combinations of input voltage and output current. Limit the output current
range if operating at the maximum input voltage. Limit the input-to-output
voltage differential if operating at the maximum output current.
Note 6: To satisfy minimum input voltage requirements, the LT1965
adjustable version is tested and specified for these conditions with an
external resistor divider (bottom 4.02k, top 4.32k) for an output voltage of
2.5V. The external resistor divider adds 300µA of output DC load current.
This external current is not factored into GND pin current.
Note 7: Dropout voltage is the minimum input-to-output voltage
differential needed to maintain regulation at a specified output current. In
dropout, the output voltage equals: (VIN – VDROPOUT)
Note 8: GND pin current is tested with VIN = VOUT(NOMINAL) + 1V and a
current source load. GND pin current increases slightly in dropout. For
the fixed output versions, an internal resistor divider will typically add
100µA to the GND pin current. See GND pin current curves in the Typical
Performance Characteristics section.
Note 9: ADJ pin bias current flows into the ADJ pin.
Note 10: SHDN pin current flows into the SHDN pin.
Note 11: Reverse-output current is tested with the IN pin grounded and
the OUT pin forced to the rated output voltage. This current flows into the
OUT pin and out of the GND pin.
Note 12: For the LT1965, LT1965-1.5 and LT1965-1.8, the minimum input
voltage specification limits the dropout voltage under some output voltage/
load conditions.
Note 13: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C (LT1965E, LT1965I) or 150°C (LT1965H)
when overtemperature is active. Continuous operation above the specified
maximum operating junction temperature may impair device reliability.
For more information www.linear.com/LT1965
1965fb
5
5 Page 
LT1965 Series
Pin Functions (DFN/MSOP/DD-Pak/TO-220)
OUT (Pins 1, 2 / 1, 2 / 4 / 4): Output. This pin supplies
power to the load. Use a minimum output capacitor of
10µF to prevent oscillations. Large load transient applica-
tions require larger output capacitors to limit peak voltage
transients. See the Applications Information section for
more information on output capacitance and reverse-output
characteristics.
SENSE (Pin 3 / 3 / 5 / 5): Sense. For fixed voltage versions
of the LT1965 (LT1965-1.5/LT1965-1.8/ LT1965-2.5/
LT1965-3.3), the SENSE pin is the input to the error am-
plifier. Optimum regulation is obtained when the SENSE
pin is connected to the OUT pin of the regulator. In criti-
cal applications, small voltage drops are caused by the
resistance (RP) of PCB traces between the regulator and
the load. These drops 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 PCB traces will add to the dropout
voltage of the regulator. The SENSE pin bias current is
100µA at the nominal rated output voltage.
ADJ (Pin 3 / 3 / 5 / 5): Adjust. This pin is the input to the
error amplifier. It has a typical bias current of 1.3µA that
flows into the pin. The ADJ pin voltage is 1.20V referenced
to ground.
GND (Pins 4, 5 / 4, 5 / 3 / 3): Ground. For the adjustable
LT1965, connect the bottom of the resistor divider, setting
output voltage, directly to GND for optimum regulation.
SHDN (Pin 6 / 6 / 1 / 1): Shutdown. Pulling the SHDN pin
low puts the LT1965 into a low power state and turns the
output off. Drive the SHDN pin with either logic or an open
collector/drain with a pull-up resistor. The resistor sup-
plies the pull-up current to the open collector/drain logic,
normally several microamperes and the SHDN pin current,
typically less than 5.5µA. If unused, connect the SHDN pin
to VIN. The SHDN pin cannot be driven below GND unless
it is tied to the IN pin. If the SHDN pin is driven below
GND while IN is powered, the output will turn on. SHDN
pin logic cannot be referenced to a negative supply rail.
IN (Pins 7, 8 / 7, 8 / 2 / 2): Input. This pin supplies power
to the device. The LT1965 requires a bypass capacitor at
IN if located more than six inches from the main input filter
capacitor. Include a bypass capacitor in battery-powered
circuits as a battery’s output impedance generally rises
with frequency. A bypass capacitor in the range of 1µF to
10µF suffices. The LT1965’s design withstands reverse
voltages on the IN pin with respect to ground and the
OUT pin. In the case of a reversed input, which occurs if
a battery is plugged in backwards, the LT1965 behaves
as if a diode is in series with its input. No reverse current
flows into the LT1965 and no reverse voltage appears at
the load. The device protects itself and the load.
Exposed Pad (Pin 9 / 9, DFN and MSOP Packages Only):
Ground. Tie this pin directly to Pins 4 and 5 and the PCB
ground. This pin provides enhanced thermal performance
with its connection to the PCB ground. See the Applica-
tions Information section for thermal considerations and
calculating junction temperature.
+
VIN
IN OUT
LT1965
SHDN SENSE
GND
RP
+
LOAD
RP
1965 F01
Figure 1. Kelvin Sense Connection
For more information www.linear.com/LT1965
1965fb
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LT1965.PDF ] | |
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