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PDF LT1763 Data sheet ( Hoja de datos )
| Número de pieza | LT1763 | |
| Descripción | LDO Micropower Regulators | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1763 Series
500mA, Low Noise, LDO
Micropower Regulators
Features
n Low Noise: 20µVRMS (10Hz to 100kHz)
n Output Current: 500mA
n Low Quiescent Current: 30µA
n Wide Input Voltage Range: 1.8V to 20V
n Low Dropout Voltage: 300mV
n Very Low Shutdown Current: < 1µA
n No Protection Diodes Needed
n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V
n Adjustable Output from 1.22V to 20V
n Stable with 3.3µF Output Capacitor
n Stable with Aluminum, Tantalum or Ceramic
Capacitors
n Reverse Battery Protection
n No Reverse Current
n Overcurrent and Overtemperature Protected
n 8-Lead SO and 12-Lead (4mm × 3mm) DFN
Packages
Applications
n Cellular Phones
n Battery-Powered Systems
n Noise-Sensitive Instrumentation Systems
Description
The LT®1763 series are micropower, low noise, low dropout
regulators. The devices are capable of supplying 500mA of
output current with a dropout voltage of 300mV. Designed
for use in battery-powered systems, the low 30µA quiescent
current makes them an ideal choice. Quiescent current is
well controlled; it does not rise in dropout as it does with
many other regulators.
A key feature of the LT1763 regulators is low output noise.
With the addition of an external 0.01µF bypass capacitor,
output noise drops to 20µVRMS over a 10Hz to 100kHz
bandwidth. The LT1763 regulators are stable with output
capacitors as low as 3.3µF. Small ceramic capacitors can
be used without the series resistance required by other
regulators.
Internal protection circuitry includes reverse battery
protection, current limiting, thermal limiting and reverse
current protection. The parts come in fixed output voltages
of 1.5V, 1.8V, 2.5V, 3V, 3.3V and 5V, and as an adjustable
device with a 1.22V reference voltage. The LT1763 regu-
lators are available in 8-lead SO and 12-lead, low profile
(4mm × 3mm × 0.75mm) DFN packages.
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. Protected by U.S. Patents including 6144250, 6118263.
Typical Application
3.3V Low Noise Regulator
VIN
3.7V TO
20V
IN OUT
1µF SENSE
3.3V AT 500mA
+ 20µVRMS NOISE
10µF
LT1763-3.3
0.01µF
SHDN
BYP
GND
1763 TA01
400
350
300
250
200
150
100
50
0
0
Dropout Voltage
100 200 300 400
OUTPUT CURRENT (mA)
500
1763 TA02
For more information www.linear.com/LT1763
1763fh
1
1 page  
LT1763 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 2)
PARAMETER
CONDITIONS
MIN TYP MAX
GND Pin Current
VIN = VOUT(NOMINAL)
(Notes 5, 7)
Output Voltage Noise
ADJ Pin Bias Current
ILOAD = 0mA
ILOAD = 1mA
IILLOOAADD
=
=
50mA
100mA
ILOAD = 250mA
ILOAD = 500mA
COUT = 10µF, CBYP = 0.01µF, ILOAD = 500mA, BW = 10Hz to 100kHz
(Notes 3, 8)
l
l
l
l
l
l
30 75
65 120
1.1 1.6
23
58
11 16
20
30 100
Shutdown Threshold
SHDN Pin Current
(Note 9)
Quiescent Current in Shutdown
Ripple Rejection
Current Limit
Input Reverse Leakage Current
Reverse Output Current
(Note 10)
VVOOUUTT
=
=
Off
On
to
to
On
Off
VVSSHHDDNN
=
=
0V
20V
VIN = 6V, VSHDN = 0V
IVLIONA–D V=O5U0T0=m1A.5V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz,
CV,INI
=Gr7aVd,eV: OVUINT
=
=
0V
VOUT(NOMINAL)
+
1V
or
2.3V
(Note
12),
∆VOUT
=
–
0.1V
MP Grade: VIN = 2.35V (Note 12), ∆VOUT = –0.1V
VIN = –20V, VOUT = 0V
LLTT11776633--11..85 VVOOUUTT
=
=
1.5V,
1.8V,
VVIINN
<
<
1.5V
1.8V
LT1763-2.5 VOUT = 2.5V, VIN < 2.5V
LT1763-3 VOUT = 3V, VIN < 3V
LLTT11776633--53 .3 VVOOUUTT
=
=
35.V3,VV,IVNI<N
< 3.3V
5V
LT1763 (Note 3) VOUT = 1.22V, VIN < 1.22V
l
l
l
l
l
0.25
50
520
520
0.8
0.65
0.1
1
0.1
65
10
10
10
10
10
10
5
2
1
1
20
20
20
20
20
20
10
UNITS
µA
µA
mA
mA
mA
mA
µVRMS
nA
V
V
µA
µA
µA
dB
mA
mA
mA
µA
µA
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: The LT1763 regulators are tested and specified under pulse
load conditions such that TJ @ TA. The LT1763 (C grade) is 100% tested
at TA = 25°C; performance at –40°C and 125°C is assured by design,
characterization and correlation with statistical process controls. The
LT1763 (I grade) is guaranteed over the full –40°C to 125°C operating
junction temperature range. The LT1763 (MP grade) is 100% tested and
guaranteed over the –55°C to 125°C operating junction temperature range.
Note 3: The LT1763 (adjustable version) is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.
Note 4: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply
for all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
Note 5: To satisfy requirements for minimum input voltage, the LT1763
(adjustable version) is tested and specified for these conditions with an
external resistor divider (two 250k resistors) for an output voltage of
2.44V. The external resistor divider will add a 5µA DC load on the output.
Note 6: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the
output voltage will be equal to: VIN – VDROPOUT.
Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) or VIN = 2.3V
(C, I grade) or 2.35V (MP grade), whichever is greater, and a current
source load. This means the device is tested while operating in its dropout
region. This is the worst-case GND pin current. The GND pin current will
decrease slightly at higher input voltages.
Note 8: ADJ pin bias current flows into the ADJ pin.
Note 9: SHDN pin current flows into the SHDN pin.
Note 10: 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 the GND pin.
Note 11: For the LT1763, LT1763-1.5 and LT1763-1.8 dropout voltage will
be limited by the minimum input voltage specification under some output
voltage/load conditions. See the curve of Minimum Input Voltage in the
Typical Performance Characteristics.
Note 12: To satisfy requirements for minimum input voltage, current limit
is tested at VIN = VOUT(NOMINAL) + 1V or 2.3V (C, I grade) or 2.35V
(MP grade), whichever is greater.
For more information www.linear.com/LT1763
1763fh
5
5 Page 
Typical Performance Characteristics
LT1763 Series
LT1763
Minimum Input Voltage
2.50
2.25
2.00 IL = 500mA
1.75
1.50 IL = 1mA
1.25
1.00
0.75
0.50
0.25 VOUT = 1.22V
0–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
1763 G46
Output Noise Spectral Density
10
COUT = 10µF
IL = 500mA
LT1763-5
CBYP = 1000pF
1 CBYP = 100pF
LT1763
0.1 CBYP = 0.01µF
0.01
10
100 1k 10k
FREQUENCY (Hz)
100k
1763 G49
LT1763-5
10Hz to 100kHz Output Noise
CBYP = 0
Load Regulation
5
LT1763
0
LT1763-2.5
LT1763-1.5
LT1763-1.8
–5
–10 LT1763-3
LT1763-3.3
–15 LT1763-5
–20 VIN = VOUT(NOMINAL) + 1V
∆IL = 1mA TO 500mA
–25
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
1763 G47
RMS Output Noise
vs Bypass Capacitor
160
COUT = 10µF
140 IL = 500mA
f = 10Hz TO 100kHz
120 LT1763-5
LT1763-3.3
100
LT1763-3
80
LT1763-2.5
60
40 LT1763
20
0
10
LT1763-1.8
LT1763-1.5
100 1000
CBYP (pF)
10000
1763 G50
LT1763-5
10Hz to 100kHz Output Noise
CBYP = 100pF
Output Noise Spectral Density
CBYP = 0
10
LT1763-3
LT1763-5
LT1763-3.3
1
LT1763 LT1763-2.5
0.1 LT1763-1.8 LT1763-1.5
COUT = 10µF
IL = 500mA
0.01
10 100 1k 10k
FREQUENCY (Hz)
100k
1763 G48
RMS Output Noise
vs Load Current (10Hz to 100kHz)
160
140 COUTCB=Y1P0=µF0
CBYP = 0.01µF
120
100
LT1763-5
80
60
40
20
0
0.01
LT1763
LT1763-5
LT1763
0.1 1 10 100
LOAD CURRENT (mA)
1000
1763 G51
LT1763-5
10Hz to 100kHz Output Noise
CBYP = 1000pF
VOUT
100µV/DIV
VOUT
100µV/DIV
VOUT
100µV/DIV
COUT = 10µF
IL = 500mA
1ms/DIV
1763 G52
COUT = 10µF
IL = 500mA
1ms/DIV
1763 G53
For more information www.linear.com/LT1763
COUT = 10µF
IL = 500mA
1ms/DIV
1763 G54
1763fh
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LT1763.PDF ] | |
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