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PDF LT1963A Data sheet ( Hoja de datos )
| Número de pieza | LT1963A | |
| Descripción | 1.5A/ Low Noise/ Fast Transient Response LDO Regulators | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n Optimized for Fast Transient Response
n Output Current: 1.5A
n Dropout Voltage: 340mV
n Low Noise: 40µVRMS (10Hz to 100kHz)
n 1mA Quiescent Current
n No Protection Diodes Needed
n Controlled Quiescent Current in Dropout
n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V
n Adjustable Output from 1.21V to 20V
n < 1µA Quiescent Current in Shutdown
n Stable with 10µF Output Capacitor*
n Stable with Ceramic Capacitors*
n Reverse Battery Protection
n No Reverse Current
n Thermal Limiting
n 5-Lead TO-220, DD, 3-Lead SOT-223 and
8-Lead SO Packages
Applications
n 3.3V to 2.5V Logic Power Supplies
n Post Regulator for Switching Supplies
LT1963A Series
1.5A, Low Noise,
Fast Transient Response
LDO Regulators
Description
The LT®1963A series are low dropout regulators optimized
for fast transient response. The devices are capable of
supplying 1.5A of output current with a dropout voltage of
340mV. Operating quiescent current is 1mA, dropping to
< 1µA in shutdown. Quiescent current is well controlled; it
does not rise in dropout as it does with many other regula-
tors. In addition to fast transient response, the LT1963A
regulators have very low output noise which makes them
ideal for sensitive RF supply applications.
Output voltage range is from 1.21V to 20V. The LT1963A
regulators are stable with output capacitors as low as
10µF. Internal protection circuitry includes reverse bat-
tery protection, current limiting, thermal limiting and
reverse current protection. The devices are available in
fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as
an adjustable device with a 1.21V reference voltage. The
LT1963A regulators are available in 5-lead TO-220, DD,
3‑lead SOT-223, 8-lead SO and 16-lead TSSOP 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 6118263, 6144250.
*See Applications Information Section.
Typical Application
VIN > 3V
3.3V to 2.5V Regulator
+
10µF*
IN OUT
LT1963A-2.5
SHDN SENSE
GND
1963A TA01
2.5V
+ 1.5A
10µF*
*TANTALUM,
CERAMIC OR
ALUMINUM ELECTROLYTIC
Dropout Voltage
400
350
300
250
200
150
100
50
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
OUTPUT CURRENT (A)
1963A TA02
For more information www.linear.com/LT1963A
1963aff
1
1 page  
LT1963A Series
E lectrical Characteristics The l denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX
Minimum Input Voltage (Notes 4,12)
Regulated Output Voltage (Note 5)
ADJ Pin Voltage (Notes 4, 5)
Line Regulation
Load Regulation
Dropout Voltage
VIN = VOUT(NOMINAL)
(Notes 6, 7, 12)
GND Pin Current
VIN = VOUT(NOMINAL) + 1V
(Notes 6, 8)
Output Voltage Noise
ADJ Pin Bias Current
IILLOOAADD
=
=
0.5A
1.5A
LT1963A-1.5 2V.I5NV=<2.V2I1NV<, 2IL0OVA,D1=m1Am<AILOAD < 1.5A
LT1963A-1.8 V2.I8NV=<2.V3IVN,<IL2O0AVD,=1m1mAA< ILOAD < 1.5A
LT1963A-2.5 V3.I5NV=<3VV,INIL<OA2D0V=,11mmAA < ILOAD < 1.5A
LT1963A-3.3 V4.I3NV=<3.V8IVN,<IL2O0AVD,=1m1mAA< ILOAD < 1.5A
LT1963A
VIN = 2.21V, ILOAD = 1mA
2.5V < VIN < 20V, 1mA < ILOAD < 1.5A
LT1963A-1.5 ∆VIN = 2.21V to 20V, ILOAD = 1mA
LT1963A-1.8 ∆VIN = 2.3V to 20V, ILOAD = 1mA
LT1963A-2.5 ∆VIN = 3V to 20V, ILOAD = 1mA
LLTT11996633AA-(3N.3o te 4) ∆∆VVIINN
=
=
32..82V1Vtoto202V0V, I,LIOLAODAD==11mmAA
LT1963A-1.5
VVIINN
=
=
2.5V,
2.5V,
∆∆IILLOOAADD
=
=
1mA
1mA
to
to
1.5A
1.5A
LT1963A-1.8
VVIINN
=
=
2.8V,
2.8V,
∆∆IILLOOAADD
=
=
1mA
1mA
to
to
1.5A
1.5A
LT1963A-2.5
VVIINN
=
=
3.5V,
3.5V,
∆∆IILLOOAADD
=
=
1mA
1mA
to
to
1.5A
1.5A
LT1963A-3.3
VVIINN
=
=
4.3V,
4.3V,
∆∆IILLOOAADD
=
=
1mA
1mA
to
to
1.5A
1.5A
LT1963A (Note 4) VIN = 2.5V, ∆ILOAD = 1mA to 1.5A
VIN = 2.5V, ∆ILOAD = 1mA to 1.5A
ILOAD = 1mA
ILOAD = 1mA
ILOAD = 100mA
ILOAD = 100mA
ILOAD = 500mA
ILOAD = 500mA
ILOAD = 1.5A
ILOAD = 1.5A
ILOAD = 0mA
ILOAD = 1mA
IIILLLOOOAAADDD
=
=
=
100mA
500mA
1.5A
COUT = 10µF, ILOAD = 1.5A, BW = 10Hz to 100kHz
(Notes 4, 9)
l
1.477
l 1.447
1.773
l 1.737
2.462
l 2.412
3.250
l 3.200
1.192
l 1.174
l
l
l
l
l
●
●
●
●
●
●
●
●
●
●
●
●
●
●
1.9
2.1
1.500
1.500
1.800
1.800
2.500
2.500
3.300
3.300
1.210
1.210
2.0
2.5
3.0
3.5
1.5
2
2
2.5
3
2
0.02
0.10
0.19
0.34
1.0
1.1
3.8
15
80
40
3
2.5
1.523
1.545
1.827
1.854
2.538
2.575
3.350
3.400
1.228
1.246
6
7
10
10
5
9
18
10
20
15
30
20
35
8
15
0.06
0.10
0.17
0.22
0.27
0.35
0.45
0.55
1.5
1.6
5.5
25
120
10
Shutdown Threshold
SHDN Pin Current (Note 10)
Quiescent Current in Shutdown
VOUT = Off to On
VOUT = On to Off
VSHDN = 0V
VSHDN = 20V
VIN = 6V, VSHDN = 0V
●
● 0.25
0.90
0.75
0.01
3
0.01
2
1
30
1
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
V
V
V
V
V
V
V
V
mA
mA
mA
mA
mA
µVRMS
µA
V
V
µA
µA
µA
For more information www.linear.com/LT1963A
1963aff
5
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
LT1963A Series
Ripple Rejection
80
70
60
50
40
COUT = 100µF TANTALUM
30 +10 × 1µF CERAMIC
20 COUT = 10µF TANTALUM
10 IL = 0.75A
0 VIN = VOUT(NOMINAL) +1V + 50mVRMS RIPPLE
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
1963A G31
Ripple Rejection
76
74
72
70
68
66
64
IL = 0.75A
VIN = VOUT(NOMINAL) +1V + 0.5VP-P
62 RIPPLE AT f = 120Hz
–50 –25 0 25 50 75
100
TEMPERATURE (°C)
125
1963A G32
LT1963A Minimum Input Voltage
3.0
2.5 IL = 1.5A
2.0
IL = 500mA
1.5 IL = 100mA
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1963A G33
Load Regulation
10
5
LT1963A-1.5
0 LT1963A
LT1963A-1.8
–5 LT1963A-2.5
–10 LT1963A-3.3
VIN = VOUT(NOMINAL) +1V
–15
(LT1963A-1.8/-2.5/-3.3)
VIN = 2.7V (LT1963A/LT1963A-1.5)
ΔIL = 1mA TO 1.5A
–20
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
125
1963A G34
RMS Output Noise vs Load
Current (10Hz to 100kHz)
50 COUT = 10µF
45
40 LT1963A-3.3
35
30 LT1963A-2.5
25 LT1963A-1.8
20
15 LT1963A-1.5
10 LT1963A
5
0
0.0001 0.001 0.01
0.1
LOAD CURRENT (A)
1
10
1963A G36
Output Noise Spectral Density
1.0
COUT = 10µF
IL =1.5A
LT1963A-3.3
0.1
LT1963A-2.5
LT1963A-1.8
LT1963A-1.5
LT1963A
0.01
10
100 1k 10k
FREQUENCY (Hz)
100k
1963A G35
LT1963A-3.3 10Hz to 100kHz Output Noise
VOUT
100µV/DIV
COUT = 10µF
ILOAD = 1.5A
1ms/DIV
1963A G37
For more information www.linear.com/LT1963A
1963aff
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LT1963A.PDF ] | |
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