LT1763IDE-5#TRPBF [Linear]
暂无描述;型号: | LT1763IDE-5#TRPBF |
厂家: | Linear |
描述: | 暂无描述 线性稳压器IC 调节器 电源电路 光电二极管 输出元件 |
文件: | 总22页 (文件大小:1120K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1763 Series
500mA, Low Noise, LDO
Micropower Regulators
FEATURES
DESCRIPTION
TheLT®1763seriesaremicropower,lownoise,lowdropout
regulators.Thedevicesarecapableofsupplying500mAof
output current with a dropout voltage of 300mV. Designed
foruseinbattery-poweredsystems,thelow30μAquiescent
current makes them an ideal choice. Quiescent current is
well controlled; it does not rise in dropout as it does with
many other regulators.
n
Low Noise: 20μV
Output Current: 500mA
(10Hz to 100kHz)
RMS
n
n
n
n
n
n
n
n
n
n
Low Quiescent Current: 30μA
Wide Input Voltage Range: 1.8V to 20V
Low Dropout Voltage: 300mV
Very Low Shutdown Current: < 1μA
No Protection Diodes Needed
Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V
Adjustable Output from 1.22V to 20V
Stable with 3.3μF Output Capacitor
Stable with Aluminum, Tantalum or Ceramic
Capacitors
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 20μV
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.
over a 10Hz to 100kHz
RMS
n
n
n
n
Reverse Battery Protection
No Reverse Current
Overcurrent and Overtemperature Protected
8-Lead SO and 12-Lead (4mm × 3mm) DFN
Packages
Internal protection circuitry includes reverse battery
protection, current limiting, thermal limiting and reverse
currentprotection.Thepartscomeinfixedoutputvoltages
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
regulators are available in 8-lead SO and 12-lead, low
profile (4mm × 3mm × 0.75mm) DFN packages.
APPLICATIONS
n
Cellular Phones
n
Battery-Powered Systems
n
Noise-Sensitive Instrumentation Systems
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
Dropout Voltage
400
350
300
250
200
150
100
50
3.3V Low Noise Regulator
3.3V AT 500mA
20μV NOISE
IN
OUT
V
IN
RMS
+
3.7V TO
20V
1μF
SENSE
10μF
LT1763-3.3
0.01μF
SHDN
GND
BYP
1763 TA01
0
0
100
200
300
400
500
OUTPUT CURRENT (mA)
1763 TA02
1763fg
1
LT1763 Series
ABSOLUTE MAXIMUM RATINGS (Note 1)
IN Pin Voltage ........................................................ 20V
OUT Pin Voltage..................................................... 20V
Input to Output Differential Voltage........................ 20V
SENSE Pin Voltage ............................................... 20V
ADJ Pin Voltage ...................................................... 7V
BYP Pin Voltage..................................................... 0.6V
SHDN Pin Voltage ................................................ 20V
Output Short-Circuit Duration ........................ Indefinite
Operating Junction Temperature Range (Note 2)
C, I Grade...........................................–40°C to 125°C
MP Grade...........................................–55°C to 125°C
Storage Temperature Range
S8 Package........................................–65°C to 150°C
DFN Package......................................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
S8 Package....................................................... 300°C
PIN CONFIGURATION
TOP VIEW
NC
OUT
1
2
3
4
5
6
12 NC
11 IN
10 IN
TOP VIEW
OUT
SENSE/ADJ*
GND
1
2
3
4
8
7
6
5
IN
OUT
GND
GND
SHDN
13
GND
NC
9
8
7
NC
SENSE/ADJ*
BYP
SHDN
GND
BYP
S8 PACKAGE
8-LEAD PLASTIC SO
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
= 150°C, θ = 70°C/W, θ = 35°C/W
JA JC
T
= 125°C, θ = 40°C/W, θ = 5°C/W
JA JC
JMAX
*PIN 2: SENSE FOR LT1763-1.5/LT1763-1.8/LT1763-2.5/LT1763-3/LT1763-3.3/LT1763-5
ADJ FOR LT1763
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
*PIN 5: SENSE FOR LT1763-1.5/LT1763-1.8/LT1763-2.5/LT1763-3/LT1763-3.3/LT1763-5
ADJ FOR LT1763
SEE THE APPLICATIONS INFORMATION SECTION.
SEE THE APPLICATIONS INFORMATION SECTION.
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
1763
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
LT1763CDE#PBF
LT1763CDE#TRPBF
LT1763IDE#TRPBF
LT1763MPDE#TRPBF
LT1763CDE-1.5#TRPBF
LT1763IDE-1.5#TRPBF
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
LT1763IDE#PBF
1763
LT1763MPDE#PBF
LT1763CDE-1.5#PBF
LT1763IDE-1.5#PBF
LT1763MPDE-1.5#PBF
LT1763CDE-1.8#PBF
LT1763IDE-1.8#PBF
LT1763MPDE-1.8#PBF
LT1763CDE-2.5#PBF
LT1763IDE-2.5#PBF
LT1763MPDE-2.5#PBF
1763
76315
76315
LT1763MPDE-1.5#TRPBF 76315
LT1763CDE-1.8#TRPBF
LT1763IDE-1.8#TRPBF
76318
76318
LT1763MPDE-1.8#TRPBF 76318
LT1763CDE-2.5#TRPBF
LT1763IDE-2.5#TRPBF
76325
76325
LT1763MPDE-2.5#TRPBF 76325
1763fg
2
LT1763 Series
ORDER INFORMATION
LEAD FREE FINISH
LT1763CDE-3#PBF
LT1763IDE-3#PBF
LT1763MPDE-3#PBF
LT1763CDE-3.3#PBF
LT1763IDE-3.3#PBF
LT1763MPDE-3.3#PBF
LT1763CDE-5#PBF
LT1763IDE-5#PBF
LT1763MPDE-5#PBF
LT1763CS8#PBF
LT1763IS8#PBF
TAPE AND REEL
PART MARKING*
17633
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
LT1763CDE-3#TRPBF
LT1763IDE-3#TRPBF
LT1763MPDE-3#TRPBF
LT1763CDE-3.3#TRPBF
LT1763IDE-3.3#TRPBF
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
8-Lead Plastic SO
17633
17633
76333
76333
LT1763MPDE-3.3#TRPBF 76333
LT1763CDE-5#TRPBF
LT1763IDE-5#TRPBF
LT1763MPDE-5#TRPBF
LT1763CS8#TRPBF
LT1763IS8#TRPBF
LT1763MPS8#TRPBF
LT1763CS8-1.5#TRPBF
LT1763IS8-1.5#TRPBF
LT1763CS8-1.8#TRPBF
LT1763IS8-1.8#TRPBF
LT1763CS8-2.5#TRPBF
LT1763IS8-2.5#TRPBF
LT1763CS8-3#TRPBF
LT1763IS8-3#TRPBF
LT1763CS8-3.3#TRPBF
LT1763IS8-3.3#TRPBF
LT1763CS8-5#TRPBF
LT1763IS8-5#TRPBF
TAPE AND REEL
17635
17635
17635
1763
1763
8-Lead Plastic SO
LT1763MPS8#PBF
LT1763CS8-1.5#PBF
LT1763IS8-1.5#PBF
LT1763CS8-1.8#PBF
LT1763IS8-1.8#PBF
LT1763CS8-2.5#PBF
LT1763IS8-2.5#PBF
LT1763CS8-3#PBF
LT1763IS8-3#PBF
LT1763CS8-3.3#PBF
LT1763IS8-3.3#PBF
LT1763CS8-5#PBF
LT1763IS8-5#PBF
LEAD BASED FINISH
LT1763CDE
1763MP
176315
176315
176318
176318
176325
176325
17633
17633
176333
176333
17635
17635
PART MARKING*
1763
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
PACKAGE DESCRIPTION
LT1763CDE#TR
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
LT1763IDE
LT1763IDE#TR
1763
LT1763MPDE
LT1763MPDE#TR
1763
LT1763CDE-1.5
LT1763CDE-1.5#TR
LT1763IDE-1.5#TR
LT1763MPDE-1.5#TR
LT1763CDE-1.8#TR
LT1763IDE-1.8#TR
LT1763MPDE-1.8#TR
LT1763CDE-2.5#TR
LT1763IDE-2.5#TR
LT1763MPDE-2.5#TR
LT1763CDE-3#TR
76315
76315
76315
76318
76318
76318
76325
76325
76325
17633
17633
17633
LT1763IDE-1.5
LT1763MPDE-1.5
LT1763CDE-1.8
LT1763IDE-1.8
LT1763MPDE-1.8
LT1763CDE-2.5
LT1763IDE-2.5
LT1763MPDE-2.5
LT1763CDE-3
LT1763IDE-3
LT1763IDE-3#TR
LT1763MPDE-3
LT1763MPDE-3#TR
–55°C to 125°C
1763fg
3
LT1763 Series
ORDER INFORMATION
LEAD FREE FINISH
LT1763CDE-3.3
LT1763IDE-3.3
LT1763MPDE-3.3
LT1763CDE-5
LT1763IDE-5
TAPE AND REEL
PART MARKING*
76333
PACKAGE DESCRIPTION
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
12-Lead (4mm × 3mm) Plastic DFN
8-Lead Plastic SO
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
LT1763CDE-3.3#TR
LT1763IDE-3.3#TR
LT1763MPDE-3.3#TR
LT1763CDE-5#TR
LT1763IDE-5#TR
LT1763MPDE-5#TR
LT1763CS8#TR
76333
76333
17635
17635
LT1763MPDE-5
LT1763CS8
17635
1763
LT1763IS8
LT1763IS8#TR
1763
8-Lead Plastic SO
LT1763MPS8
LT1763CS8-1.5
LT1763IS8-1.5
LT1763CS8-1.8
LT1763IS8-1.8
LT1763CS8-2.5
LT1763IS8-2.5
LT1763CS8-3
LT1763IS8-3
LT1763MPS8#TR
LT1763CS8-1.5#TR
LT1763IS8-1.5#TR
LT1763CS8-1.8#TR
LT1763IS8-1.8#TR
LT1763CS8-2.5#TR
LT1763IS8-2.5#TR
LT1763CS8-3#TR
LT1763IS8-3#TR
LT1763CS8-3.3#TR
LT1763IS8-3.3#TR
LT1763CS8-5#TR
1763MP
176315
176315
176318
176318
176325
176325
17633
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
17633
8-Lead Plastic SO
LT1763CS8-3.3
LT1763IS8-3.3
LT1763CS8-5
LT1763IS8-5
176333
176333
17635
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
17635
8-Lead Plastic SO
LT1763IS8-5#TR
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL 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
UNITS
l
l
Minimum Operating Voltage
C, I Grade: I
MP Grade: I
= 500mA (Notes 3, 11)
= 500mA (Notes 3, 11)
1.8
1.8
2.3
2.35
V
V
LOAD
LOAD
Regulated Output Voltage
(Note 4)
LT1763-1.5
LT1763-1.8
LT1763-2.5
LT1763-3
V
= 2V, I
= 1mA
1.485
1.462
1.5
1.5
1.515
1.538
V
V
IN
LOAD
l
l
l
l
l
l
2.5V < V < 20V, 1mA < I
< 500mA
< 500mA
< 500mA
IN
LOAD
V
= 2.3V, I
= 1mA
LOAD
1.782
1.755
1.8
1.8
1.818
1.845
V
V
IN
2.8V < V < 20V, 1mA < I
IN
LOAD
V
= 3V, I
= 1mA
2.475
2.435
2.5
2.5
2.525
2.565
V
V
IN
LOAD
3.5V < V < 20V, 1mA < I
IN
LOAD
V
= 3.5V, I
IN
= 1mA
LOAD
2.970
2.925
3
3
3.030
3.075
V
V
IN
4V < V < 20V, 1mA < I
< 500mA
LOAD
LT1763-3.3
LT1763-5
V
= 3.8V, I
= 1mA
LOAD
3.267
3.220
3.3
3.3
3.333
3.380
V
V
IN
4.3V < V < 20V, 1mA < I
< 500mA
IN
LOAD
V
= 5.5V, I
IN
= 1mA
LOAD
4.950
4.875
5
5
5.050
5.125
V
V
IN
6V < V < 20V, 1mA < I
< 500mA
LOAD
1763fg
4
LT1763 Series
ELECTRICAL 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
UNITS
ADJ Pin Voltage
(Notes 3, 4)
LT1763
V
= 2.2V, I
= 1mA
LOAD
1.208
1.190
1.190
1.220
1.220
1.220
1.232
1.250
1.250
V
V
V
IN
l
l
C, I Grade: 2.3V < V < 20V, 1mA < I
< 500mA
LOAD
IN
IN
LOAD
MP Grade: 2.35V < V < 20V, 1mA < I
< 500mA
l
l
l
l
l
l
l
l
l
Line Regulation
LT1763-1.5
LT1763-1.5
LT1763-1.8
LT1763-2.5
LT1763-3
C, I Grade: ΔV = 2V to 20V, I
= 1mA
LOAD
1
1
1
1
1
1
1
1
1
5
5
5
5
5
5
5
5
5
mV
mV
mV
mV
mV
mV
mV
mV
mV
IN
LOAD
MP Grade: ΔV = 2.1V to 20V, I
= 1mA
IN
ΔV = 2.3V to 20V, I
= 1mA
IN
LOAD
ΔV = 3V to 20V, I
= 1mA
IN
LOAD
ΔV = 3.5V to 20V, I
= 1mA
= 1mA
= 1mA
IN
IN
IN
LOAD
LOAD
LOAD
LT1763-3.3
LT1763-5
ΔV = 3.8V to 20V, I
ΔV = 5.5V to 20V, I
LT1763 (Note 3) C, I Grade: ΔV = 2V to 20V, I
LT1763 (Note 3) MP Grade: ΔV = 2.1V to 20V, I
= 1mA
IN
LOAD
= 1mA
IN
LOAD
Load Regulation
LT1763-1.5
LT1763-1.8
LT1763-2.5
LT1763-3
V
V
= 2.5V, ΔI
= 2.5V, ΔI
= 1mA to 500mA
3
8
mV
mV
IN
IN
LOAD
LOAD
l
l
l
l
l
l
= 1mA to 500mA
15
V
V
= 2.8V, ΔI
= 2.8V, ΔI
= 1mA to 500mA
= 1mA to 500mA
4
9
18
mV
mV
IN
IN
LOAD
LOAD
V
V
= 3.5V, ΔI
= 3.5V, ΔI
= 1mA to 500mA
= 1mA to 500mA
5
12
25
mV
mV
IN
IN
LOAD
LOAD
V
V
= 4V, ΔI
= 4V, ΔI
= 1mA to 500mA
= 1mA to 500mA
7
15
30
mV
mV
IN
IN
LOAD
LOAD
LT1763-3.3
LT1763-5
V
V
= 4.3V, ΔI
= 4.3V, ΔI
= 1mA to 500mA
= 1mA to 500mA
7
17
33
mV
mV
IN
IN
LOAD
LOAD
V
V
= 6V, ΔI
= 6V, ΔI
= 1mA to 500mA
= 1mA to 500mA
12
2
25
50
mV
mV
IN
IN
LOAD
LOAD
LT1763 (Note 3)
V
= 2.3V, ΔI
= 1mA to 500mA
6
12
12
mV
mV
mV
IN
LOAD
l
l
C, I Grade: V = 2.3V, ΔI
= 1mA to 500mA
LOAD
IN
IN
LOAD
MP Grade: V = 2.35V, ΔI
= 1mA to 500mA
Dropout Voltage
I
I
= 10mA
= 10mA
0.13
0.17
0.20
0.30
0.19
0.25
V
V
LOAD
LOAD
l
l
l
l
V
= V
OUT(NOMINAL)
IN
(Notes 5, 6, 11)
I
I
= 50mA
= 50mA
0.22
0.32
V
V
LOAD
LOAD
I
I
= 100mA
= 100mA
0.24
0.34
V
V
LOAD
LOAD
I
I
= 500mA
= 500mA
0.35
0.45
V
V
LOAD
LOAD
l
l
l
l
l
l
GND Pin Current
I
I
I
I
I
I
= 0mA
30
65
1.1
2
75
120
1.6
3
μA
μA
mA
mA
mA
mA
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
V
= V
= 1mA
IN
OUT(NOMINAL)
(Notes 5, 7)
= 50mA
= 100mA
= 250mA
= 500mA
5
8
11
16
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
C
= 10μF, C
= 0.01μF, I
= 500mA, BW = 10Hz to 100kHz
20
30
μV
RMS
OUT
BYP
LOAD
(Notes 3, 8)
100
2
nA
l
l
V
OUT
V
OUT
= Off to On
= On to Off
0.8
0.65
V
V
0.25
50
SHDN Pin Current
(Note 9)
V
SHDN
V
SHDN
= 0V
= 20V
0.1
1
μA
μA
Quiescent Current in Shutdown
Ripple Rejection
V
IN
= 6V, V
= 0V
0.1
65
1
μA
dB
SHDN
V
LOAD
– V
= 1.5V (Avg), V
= 0.5V , f
= 120Hz,
IN
OUT
RIPPLE
P-P RIPPLE
I
= 500mA
1763fg
5
LT1763 Series
ELECTRICAL 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
= 7V, V = 0V
OUT
MIN
TYP
MAX
UNITS
Current Limit
V
IN
l
l
C, I Grade: V = V
+ 1V or 2.3V (Note 12), ΔV = –0.1V
OUT
520
520
mA
mA
IN
OUT(NOMINAL)
MP Grade: V = 2.35V (Note 12), ΔV
= –0.1V
IN
OUT
l
Input Reverse Leakage Current
V
IN
= –20V, V
= 0V
1
mA
OUT
Reverse Output Current
(Note 10)
LT1763-1.5
LT1763-1.8
LT1763-2.5
LT1763-3
V
V
V
V
V
V
V
= 1.5V, V < 1.5V
10
10
10
10
10
10
5
20
20
20
20
20
20
10
μA
μA
μA
μA
μA
μA
μA
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
= 1.8V, V < 1.8V
IN
= 2.5V, V < 2.5V
IN
= 3V, V < 3V
IN
LT1763-3.3
LT1763-5
= 3.3V, V < 3.3V
IN
= 5V, V < 5V
IN
LT1763 (Note 3)
= 1.22V, V < 1.22V
IN
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 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: V – V
.
IN
DROPOUT
Note 7: GND pin current is tested with V = V
or V = 2.3V
IN
IN
OUT(NOMINAL)
Note 2: The LT1763 regulators are tested and specified under pulse
(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.
load conditions such that T ≅ T . The LT1763 (C grade) is 100% tested
J
A
at T = 25°C; performance at –40°C and 125°C is assured by design,
A
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 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 V = V
+ 1V or 2.3V (C, I grade) or 2.35V
IN
OUT(NOMINAL)
(MP grade), whichever is greater.
1763fg
6
LT1763 Series
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Dropout Voltage
Guaranteed Dropout Voltage
Dropout Voltage
500
450
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
= TEST POINTS
I
= 500mA
L
I
L
= 250mA
T
= 125°C
J
T
b 125°C
b 25°C
J
I = 100mA
L
T
J
T
= 25°C
J
I
= 1mA
L
I
L
= 10mA
I
L
= 50mA
0
0
0
–50
0
25
50
75 100 125
200
200
250 300 350 400 450 500
–25
0
50 100 150
250 300 350 400 450 500
0
50 100 150
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
1763 G03
1763 G01
1763 G02
LT1763-1.5
Output Voltage
LT1763-1.8
Output Voltage
Quiescent Current
1.528
1.521
1.514
1.507
1.500
1.493
1.486
1.479
1.472
1.84
1.83
1.82
1.81
1.80
1.79
1.78
1.77
1.76
50
45
40
35
30
25
20
15
10
5
I
= 1mA
I = 1mA
L
L
V
= V
IN
SHDN
V
R
R
= 6V
IN
L
L
= d, I = 0 (LT1763-1.5/-1.8/-2.5/-3/-3.3/-5)
L
= 250k, I = 5μA (LT1763)
L
0
–25
0
25
50
75
125
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
–50
100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
1763 G04
1763 G05
1763 G06
LT1763-2.5
Output Voltage
LT1763-3
Output Voltage
LT1763-3.3
Output Voltage
2.54
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
3.060
3.045
3.030
3.015
3.000
2.985
2.970
2.955
2.940
3.360
3.345
3.330
3.315
3.300
3.285
3.270
3.255
3.240
I
= 1mA
I
= 1mA
I = 1mA
L
L
L
–25
0
25
50
75
125
–25
0
25
50
75
125
–50 –25
0
25
50
75 100 125
–50
100
–50
100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
1763 G07
1763 G08
1763 G09
1763fg
7
LT1763 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1763-5
Output Voltage
LT1763
ADJ Pin Voltage
LT1763-1.5
Quiescent Current
5.100
5.075
5.050
5.025
5.000
4.975
4.950
4.925
4.900
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
250
225
200
175
150
125
100
75
I
= 1mA
L
I = 1mA
L
T
R
= 25°C
J
L
= d
50
V
= V
IN
SHDN
25
V
= 0V
6
SHDN
0
–25
0
25
50
75
125
–25
0
25
50
75
125
–50
100
–50
100
0
1
2
3
4
5
7
8
9
10
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
1763 G10
1763 G11
1763 G12
LT1763-1.8
Quiescent Current
LT1763-2.5
Quiescent Current
LT1763-3
Quiescent Current
250
225
200
175
150
125
100
75
250
225
200
175
150
125
100
75
250
225
200
175
150
125
100
75
T
= 25°C
= d
T
= 25°C
= d
T = 25°C
J
R = d
L
J
L
J
L
R
R
50
50
50
V
= V
V
= V
V
= V
SHDN IN
SHDN
IN
SHDN
IN
25
25
25
V
= 0V
6
V
= 0V
8
V
SHDN
= 0V
8
SHDN
SHDN
0
0
0
0
1
2
3
4
5
7
8
9
10
0
1
2
3
4
5
6
7
9
10
0
1
2
3
4
5
6
7
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1763 G13
1763 G14
1763 G15
LT1763-3.3
Quiescent Current
LT1763-5
Quiescent Current
LT1763
Quiescent Current
250
225
200
175
150
125
100
75
250
225
200
175
150
125
100
75
40
35
30
25
20
15
10
5
T
= 25°C
T
= 25°C
T
= 25°C
R = 250k
L
J
L
J
L
J
R
= d
R
= d
V
= V
IN
SHDN
50
50
V
= V
V
= V
SHDN IN
SHDN
IN
25
25
V
= 0V
8
V
= 0V
8
V
= 0V
SHDN
SHDN
SHDN
0
0
0
0
1
2
3
4
5
6
7
9
10
0
1
2
3
4
5
6
7
9
10
0
2
4
6
8
10 12 14 16 18 20
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1763 G16
1763 G17
1763 G18
1763fg
8
LT1763 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1763-1.5
GND Pin Current
LT1763-1.8
GND Pin Current
LT1763-2.5
GND Pin Current
1200
1000
800
600
400
200
0
1200
1000
800
600
400
200
0
1200
1000
800
600
400
200
0
R
= 50Ω
L
R
L
= 36Ω
R
L
= 30Ω
L
L
I
= 50mA*
L
I
= 50mA*
I
= 50mA*
T
= 25°C
T
= 25°C
T = 25°C
J
J
V
J
= V
V
= V
V = V
IN SHDN
IN
SHDN
IN
SHDN
*FOR V
= 1.5V
*FOR V
= 1.8V
*FOR V
= 2.5V
OUT
OUT
OUT
R
I
= 250Ω
R
I
= 150Ω
= 10mA*
L
L
R
L
= 180Ω
L
L
= 10mA*
I
= 10mA*
L
R
= 1.5k
= 1mA*
R
L
= 2.5k
R
I
= 1.8k
L
L
L
I
L
I
= 1mA*
= 1mA*
L
4
4
4
0
1
2
3
5
6
7
8
9
10
0
1
2
3
5
6
7
8
9
10
10
10
0
1
2
3
5
6
7
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1763 G19
1763 G20
1763 G21
LT1763-3
GND Pin Current
LT1763-3.3
GND Pin Current
LT1763-5
GND Pin Current
1200
1000
800
600
400
200
0
1200
1000
800
600
400
200
0
1200
1000
800
600
400
200
0
R
L
= 60Ω
R
L
= 66Ω
L
R
I
= 100Ω
= 50mA*
L
L
L
I
= 50mA*
I
= 50mA*
T
= 25°C
T
V
= 25°C
T = 25°C
J
J
J
V
= V
= V
SHDN
V = V
IN SHDN
IN
SHDN
IN
*FOR V
= 3V
*FOR V
= 3.3V
*FOR V
= 5V
OUT
OUT
OUT
R
= 500Ω
= 10mA*
R
I
= 300Ω
= 10mA*
R
I
= 330Ω
L
L
L
L
L
I
= 10mA*
L
R
= 3k
R
L
= 5k
L
= 1mA*
R
I
= 3.3k
L
= 1mA*
L
I
= 1mA*
I
L
L
4
4
4
0
1
2
3
5
6
7
8
9
10
0
1
2
3
5
6
7
8
9
0
1
2
3
5
6
7
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1763 G22
1763 G23
1763 G24
LT1763
GND Pin Current
LT1763-1.5
GND Pin Current
LT1763-1.8
GND Pin Current
1200
1000
800
600
400
200
0
12
10
8
12
10
8
T
= 25°C
T = 25°C
J
J
IN
V
= V
SHDN
V = V
IN SHDN
R
L
= 24.4Ω
L
*FOR V
= 1.5V
*FOR V
= 1.8V
OUT
OUT
I
= 50mA*
R
= 3Ω
L
R
= 3.6Ω
L
I
= 500mA*
L
I
= 500mA*
L
T
= 25°C
= V
J
IN
V
R
= 6Ω
R
L
= 5Ω
= 300mA*
SHDN
L
L
6
6
*FOR V
= 1.22V
I
= 300mA*
I
OUT
L
R
L
= 122Ω
L
4
4
I
= 10mA*
R
L
= 15Ω
R
= 18Ω
L
L
I
= 100mA*
I
= 100mA*
L
R
I
= 1.22k
= 1mA*
2
2
L
L
0
0
4
4
4
0
1
2
3
5
6
7
8
9
10
0
1
2
3
5
6
7
8
9
0
1
2
3
5
6
7
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1763 G25
1763 G26
1763 G27
1763fg
9
LT1763 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1763-2.5
GND Pin Current
LT1763-3
GND Pin Current
LT1763-3.3
GND Pin Current
12
10
8
12
10
8
12
10
8
T
= 25°C
T
= 25°C
T = 25°C
J
J
J
V
= V
V
= V
V = V
IN SHDN
IN
SHDN
IN
SHDN
*FOR V
= 2.5V
*FOR V
= 3V
*FOR V
= 3.3V
OUT
OUT
OUT
R
= 5Ω
L
R
= 6Ω
R = 6.6Ω
L
L
I
L
= 500mA*
I
L
= 500mA*
I = 500mA*
L
6
6
R
L
= 10Ω
6
R
L
= 11Ω
L
L
R
L
= 8.33Ω
L
I
= 300mA*
I
= 300mA*
I
= 300mA*
4
4
4
R
L
= 25Ω
R
L
= 30Ω
R = 33Ω
L
L
L
L
I
= 100mA*
I
= 100mA*
I
= 100mA*
2
2
2
0
0
0
4
4
4
0
1
2
3
5
6
7
8
9
10
0
1
2
3
5
6
7
8
9
10
0
1
2
3
5
6
7
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1763 G28
1763 G29
1763 G30
LT1763-5
GND Pin Current
LT1763
GND Pin Current
GND Pin Current vs ILOAD
12
10
8
12
10
8
12
10
8
T
= 25°C
= V
T
= 25°C
= V
J
IN
V
IN
= V
+ 1V
J
IN
OUT(NOMINAL)
V
V
SHDN
SHDN
R = 10Ω
L
L
*FOR V
= 1.22V
*FOR V
= 5V
OUT
OUT
I
= 500mA*
R
= 2.44Ω
L
I
= 500mA*
L
R
L
= 16.7Ω
L
= 300mA*
R
L
L
= 4.07Ω
6
6
6
I
I
= 300mA*
4
4
4
R
L
L
= 12.2Ω
R = 50Ω
L
= 100mA*
L
I
= 100mA*
I
2
2
2
0
0
0
4
4
200
250 300 350 400 450 500
0
1
2
3
5
6
7
8
9
10
0
1
2
3
5
6
7
8
9
10
0
50 100 150
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
1763 G31
1763 G32
1763 G33
SHDN Pin Threshold
(On-to-Off)
SHDN Pin Threshold
(Off-to-On)
SHDN Pin Input Current
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
I
= 1mA
L
I
= 500mA
L
I
= 1mA
L
–50
0
25
50
75 100 125
–50
0
25
50
75 100 125
4
–25
–25
0
1
2
3
6
7
8
9
10
5
TEMPERATURE (°C)
TEMPERATURE (°C)
SHDN PIN VOLTAGE (V)
1763 G34
1763 G35
1763 G36
1763fg
10
LT1763 Series
TYPICAL PERFORMANCE CHARACTERISTICS
SHDN Pin Input Current
ADJ Pin Bias Current
Current Limit
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
140
120
100
80
V
= 20V
V
= 0V
SHDN
OUT
60
40
20
0
–25
0
25
50
75
125
–50
0
25
50
75
125
–50
100
100
4
7
–25
0
2
3
5
6
1
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
1763 G37
1763 G38
1763 G39
Current Limit
Reverse Output Current
Reverse Output Current
20
18
16
14
12
10
8
1.2
1.0
0.8
0.6
0.4
0.2
0
100
90
80
70
60
50
40
30
20
10
0
V
V
V
V
V
V
V
= 0V, V
= 1.22V (LT1763)
OUT
IN
V
V
= 7
OUT
T
= 25°C, V = 0V
IN
IN
J
LT1763-1.5
= 1.5V (LT1763-1.5)
= 1.8V (LT1763-1.8)
= 2.5V (LT1763-2.5)
= 3V (LT1763-3)
= 0V
OUT
OUT
OUT
OUT
OUT
OUT
CURRENT FLOWS
INTO OUTPUT PIN
V
= V
(LT1763)
OUT
ADJ
= 3.3V (LT1763-3.3)
= 5V (LT1763-5)
LT1763
LT1763-1.8
LT1763-2.5
LT1763-3
LT1763-1.5/-1.8/
-2.5/-3/-3.3/-5
LT1763-3.3
6
4
LT1763
LT1763-5
2
0
–50
0
25
50
75 100 125
4
–50
0
25
50
75
125
–25
0
1
2
3
6
7
8
9
10
–25
100
5
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1763 G40
1763 G42
1763 G41
Input Ripple Rejection
Input Ripple Rejection
Ripple Rejection
68
66
64
62
60
58
56
54
52
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
C
= 0.01μF
BYP
C
= 10μF
OUT
C
= 1000pF
BYP
C
= 100pF
BYP
I
= 500mA
= V
V
= V
+
OUT (NOMINAL)
L
IN
I
= 500mA
IN
L
V
+
1V + 0.5V RIPPLE
P-P
OUT(NOMINAL)
V
= V
+
C
= 4.7μF
IN
OUT(NOMINAL)
OUT
1V + 50mV
C
RIPPLE
AT f = 120Hz
RMS
1V + 50mV
C
RIPPLE
1k
RMS
= 0
I
= 500mA
BYP
= 10μF
L
OUT
–25
0
25
50
75
125
–50
100
10
100
1k
10k
100k
1M
10
100
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
TEMPERATURE (°C)
1763 G43
1763 G44
1763 G45
1763fg
11
LT1763 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1763
Output Noise Spectral Density
CBYP = 0
Minimum Input Voltage
Load Regulation
5
0
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
10
1
LT1763-1.5
LT1763-2.5
LT1763
LT1763-3
LT1763-1.8
I
= 500mA
L
LT1763-3.3
LT1763-5
–5
I
= 1mA
L
LT1763-3
–10
–15
–20
–25
LT1763
LT1763-3.3
LT1763-5
LT1763-2.5
LT1763-1.8
LT1763-1.5
0.1
V
= V
+ 1V
IN
L
OUT(NOMINAL)
C
= 10μF
OUT
$I = 1mA TO 500mA
V
= 1.22V
OUT
I = 500mA
L
0.01
–50
0
25
50
75 100 125
–25
–25
0
25
50
75
125
–50
100
10
100
1k
FREQUENCY (Hz)
10k
100k
TEMPERATURE (°C)
TEMPERATURE (°C)
1763 G48
1763 G46
1763 G47
RMS Output Noise
vs Load Current (10Hz to 100kHz)
RMS Output Noise
vs Bypass Capacitor
Output Noise Spectral Density
10
1
160
140
120
100
80
160
C
I
= 10μF
C = 10μF
OUT
OUT
L
C
I
= 10μF
OUT
= 500mA
C
BYP
= 0
= 0.01μF
BYP
= 500mA
140
L
C
f = 10Hz TO 100kHz
C
= 1000pF
BYP
LT1763-5
120 LT1763-5
LT1763-5
LT1763-3.3
C
BYP
= 100pF
100
80
LT1763-3
LT1763
LT1763-2.5
60
60
LT1763
0.1
C
BYP
= 0.01μF
100
40
40
LT1763
LT1763-5
LT1763
LT1763-1.8
20
20
0
LT1763-1.5
0.01
0
0.01
10
1k
FREQUENCY (Hz)
10k
100k
0.1
1
10
100
1000
10
100
1000
(pF)
10000
LOAD CURRENT (mA)
C
BYP
1763 G49
1763 G51
1763 G50
LT1763-5
LT1763-5
10Hz to 100kHz Output Noise
CBYP = 100pF
LT1763-5
10Hz to 100kHz Output Noise
CBYP = 0
10Hz to 100kHz Output Noise
CBYP = 1000pF
V
V
OUT
OUT
V
OUT
100μV/DIV
100μV/DIV
100μV/DIV
1763 G53
1763 G54
1763 G52
1ms/DIV
1ms/DIV
1ms/DIV
C
I
= 10μF
C
= 10μF
OUT
C
I
= 10μF
OUT
L
OUT
L
= 500mA
I
= 500mA
L
= 500mA
1763fg
12
LT1763 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT1763-5
LT1763-5
Transient Response
CBYP = 0.01μF
LT1763-5
Transient Response
CBYP = 0
10Hz to 100kHz Output Noise
CBYP = 0.01μF
V
C
C
= 6V
V
C
C
= 6V
IN
IN
IN
IN
0.4
0.2
0.10
0.05
0
= 10μF
= 10μF
= 10μF
= 10μF
OUT
OUT
0
V
–0.2
–0.4
–0.05
–0.10
OUT
100μV/DIV
600
400
200
0
600
400
200
0
1763 G55
1ms/DIV
C
L
= 10μF
OUT
I
= 500mA
400
TIME (μs)
0
200
600
800
1000
40
10 20 30
0
50 60 70 80 90 100
TIME (μs)
1763 G56
1763 G57
1763fg
13
LT1763 Series
PIN FUNCTIONS (DE12/S8)
NC (Pins 1, 4, 9, 12) DE12 Only: No Connect. No connect
BYP (Pin 6/Pin 4): Bypass. The BYP pin is used to bypass
thereferenceoftheLT1763regulatorstoachievelownoise
performance from the regulator. The BYP pin is clamped
pins have no connection to any internal circuitry. These
pins may be tied to either GND or V , or left floating.
IN
internally to 0.6V (one V ). A small capacitor from the
BE
OUT (Pins 2, 3/Pin 1): Output. The output supplies power
to the load. A minimum output capacitor of 3.3μF is re-
quired to prevent oscillations. Larger output capacitors
will be required for applications with large transient loads
tolimitpeakvoltagetransients. SeetheApplicationsInfor-
mationsectionformoreinformationonoutputcapacitance
and reverse output characteristics.
output to this pin will bypass the reference to lower the
output voltage noise. A maximum value of 0.01μF can
be used for reducing output voltage noise to a typical
20μV
over a 10Hz to 100kHz bandwidth. If not used,
RMS
this pin must be left unconnected.
GND (Pins 7, Exposed Pad Pin 13/Pins 3, 6, 7): Ground.
The exposed pad of the DFN package is an electrical con-
nection to GND. To ensure proper electrical and thermal
performance, solder Pin 13 to the PCB ground and tie
directly to Pin 7. Connect the bottom of the output volt-
age setting resistor divider directly to the GND pins for
optimum load regulation performance.
ADJ (Pin 5/Pin 2): Adjust. For the adjustable LT1763, 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 the curve of ADJ Pin Bias Current vs
Temperature in the Typical Performance Characteristics
section).TheADJpinvoltageis1.22Vreferencedtoground
and the output voltage range is 1.22V to 20V.
SHDN (Pin 8/Pin 5): Shutdown. The SHDN pin is used
to put the LT1763 regulators into a low power shutdown
state. The output will be off when the SHDN pin is pulled
low. The SHDN pin can be driven either by 5V logic or
open-collector logic with a pull-up resistor. The pull-up
resistor is required to supply the pull-up current of the
open-collector gate, normally several microamperes, and
the SHDN pin current, typically 1μA. If unused, the SHDN
SENSE (Pin 5/Pin 2): Output Sense. For fixed volt-
age versions of the LT1763 (LT1763-1.5/LT1763-1.8/
LT1763-2.5/LT1763-3/LT1763-3.3/LT1763-5), the SENSE
pin is the input to the error amplifier. Optimum regula-
tion will be obtained at the point where the SENSE pin
is connected to the OUT pin of the regulator. In critical
applications, small voltage drops are caused by the re-
pin must be connected to V . The device will be in the low
IN
sistance (R ) of PC traces between the regulator and the
P
power shutdown state if the SHDN pin is not connected.
load. These may be eliminated by connecting the SENSE
pin to the output at the load as shown in Figure 1 (Kelvin
Sense Connection).
IN(Pin10,11/Pin8):Input.Powerissuppliedtothedevice
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 imped-
ance 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 LT1763 regulators are designed to withstand reverse
voltages on the IN pin with respect to ground and the OUT
pin. In the case of a reverse input, which can happen if
a battery is plugged in backwards, the device will act as
if there is a diode in series with its input. There will be
no reverse current flow into the regulator and no reverse
voltage will appear at the load. The device will protect both
itself and the load.
R
P
8
1
IN
OUT
LT1763
+
5
2
+
SHDN SENSE
LOAD
V
IN
GND
3
R
P
1763 F01
Figure 1. Kelvin Sense Connection
Note that the voltage drop across the external PC traces will
add to the dropout voltage of the regulator. The SENSE pin
biascurrentis10μAatthenominalratedoutputvoltage.The
SENSE pin can be pulled below ground (as in a dual supply
system where the regulator load is returned to a negative
supply) and still allow the device to start and operate.
1763fg
14
LT1763 Series
APPLICATIONS INFORMATION
The LT1763 series are 500mA low dropout regulators with
micropowerquiescentcurrentandshutdown.Thedevices
are capable of supplying 500mA at a dropout voltage of
to 1.22V: V /1.22V. For example, load regulation for an
OUT
output current change of 1mA to 500mA is –2mV typical
at V
= 1.22V. At V
= 12V, load regulation is:
OUT
OUT
300mV. Output voltage noise can be lowered to 20μV
RMS
(12V/1.22V)(–2mV) = –19.6mV
over a 10Hz to 100kHz bandwidth with the addition of
a 0.01μF reference bypass capacitor. Additionally, the
referencebypasscapacitorwillimprovetransientresponse
oftheregulator,loweringthesettlingtimefortransientload
conditions. The low operating quiescent current (30μA)
drops to less than 1μA in shutdown. In addition to the
low quiescent current, the LT1763 regulators incorporate
several protection features which make them ideal for use
in battery-powered systems. The devices are protected
against both reverse input and reverse output voltages.
In battery backup applications where the output can be
held up by a backup battery when the input is pulled to
ground, the LT1763-X acts like it has a diode in series with
its output and prevents reverse current flow. Additionally,
in dual supply applications where the regulator load is
returned to a negative supply, the output can be pulled
below ground by as much as 20V and still allow the device
to start and operate.
IN
OUT
ADJ
V
OUT
+
V
IN
R2
LT1763
GND
R2
⎞
⎟
⎠
R1
⎛
⎝
VOUT = 1.22V 1+
+ I R2
ADJ)( )
(
⎜
V
ADJ = 1.22V
ADJ = 30nA AT 25°C
OUTPUT RANGE = 1.22V TO 20V
R1
I
1763 F02
Figure 2. Adjustable Operation
Bypass Capacitance and Low Noise Performance
The LT1763 regulators may be used with the addition of
a bypass capacitor from V
to the BYP pin to lower
OUT
output voltage noise. A good quality low leakage capacitor
is recommended. This capacitor will bypass the reference
of the regulator, providing a low frequency noise pole.
The noise pole provided by this bypass capacitor will
Adjustable Operation
lower the output voltage noise to as low as 20μV
TheadjustableversionoftheLT1763hasanoutputvoltage
range of 1.22V to 20V. The output voltage is set by the
ratio of two external resistors, as shown in Figure 2. The
device servos the output to maintain the ADJ pin voltage
at 1.22V referenced to ground. The current in R1 is then
equal to 1.22V/R1 and the current in R2 is the current
in R1 plus the ADJ pin bias current. The ADJ pin bias
current, 30nA at 25°C, flows through R2 into the ADJ pin.
The output voltage can be calculated using the formula in
Figure 2. The value of R1 should be no greater than 250k
to minimize errors in the output voltage caused by the
ADJ pin bias current. Note that in shutdown the output
is turned off and the divider current will be zero. Curves
of ADJ Pin Voltage vs Temperature and ADJ Pin Bias
CurrentvsTemperatureappearintheTypicalPerformance
Characteristics section.
RMS
with the addition of a 0.01μF bypass capacitor. Using
a bypass capacitor has the added benefit of improving
transient response. With no bypass capacitor and a 10μF
output capacitor, a 10mA to 500mA load step will settle
to within 1% of its final value in less than 100μs. With
the addition of a 0.01μF bypass capacitor, the output will
settle to within 1% for a 10mA to 500mA load step in less
than 10μs, with total output voltage deviation of less than
2.5% (see the LT1763-5 Transient Response curve in the
Typical Performance Characteristics section). However,
regulator start-up time is proportional to the size of the
bypass capacitor, slowing to 15ms with a 0.01μF bypass
capacitor and 10μF output capacitor.
The adjustable device is tested and specified with the ADJ
pin tied to the OUT pin for an output voltage of 1.22V.
Specifications for output voltages greater than 1.22V will
be proportional to the ratio of the desired output voltage
1763fg
15
LT1763 Series
APPLICATIONS INFORMATION
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Output Capacitance and Transient Response
The LT1763 regulators are designed to be stable with a
wide range of output capacitors. The ESR of the output
capacitor affects stability, most notably with small capaci-
tors. A minimum output capacitor of 3.3μF with an ESR
of 3Ω, or less, is recommended to prevent oscillations.
The LT1763-X is a micropower device and output transient
response will be a function of output capacitance. Larger
values of output capacitance decrease the peak deviations
and provide improved transient response for larger load
current changes. Bypass capacitors, used to decouple
individual components powered by the LT1763-X, will
increase the effective output capacitor value. With larger
capacitors used to bypass the reference (for low noise
operation), larger values of output capacitors are needed.
For 100pF of bypass capacitance, 4.7μF of output capaci-
tor is recommended. With a 1000pF bypass capacitor or
larger, a 6.8μF output capacitor is recommended.
STABLE REGION
C
= 0
BYP
C
= 100pF
BYP
C
= 330pF
BYP
C
r 1000pF
BYP
1
3
6 9 10
7 8
2
4
5
OUTPUT CAPACITANCE (μF)
1763 F03
Figure 3. Stability
20
0
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
X5R
Y5V
–20
–40
–60
–80
–100
The shaded region of Figure 3 defines the range over
whichtheLT1763regulatorsarestable. TheminimumESR
needed is defined by the amount of bypass capacitance
used, while the maximum ESR is 3Ω.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
temperature and applied voltage. The most common
dielectrics used are specified with EIA temperature
characteristic codes of Z5U, Y5V, X5R and X7R. The Z5U
andY5Vdielectricsaregoodforprovidinghighcapacitances
in a small package, but they tend to have strong voltage
and temperature coefficients, as shown in Figures 4
and 5. When used with a 5V regulator, a 16V 10μF Y5V
capacitor can exhibit an effective value as low as 1μF to
2μF for the DC bias voltage applied and over the operating
temperature range. The X5R and X7R dielectrics result in
more stable characteristics and are more suitable for use
as the output capacitor. The X7R type has better stability
across temperature, while the X5R is less expensive and is
availableinhighervalues.Carestillmustbeexercisedwhen
using X5R and X7R capacitors; the X5R and X7R codes
only specify operating temperature range and maximum
capacitancechangeovertemperature.Capacitancechange
due to DC bias with X5R and X7R capacitors is better than
0
8
12 14
2
4
6
10
16
DC BIAS VOLTAGE (V)
1763 F04
Figure 4. Ceramic Capacitor DC Bias Characteristics
40
20
X5R
0
–20
–40
Y5V
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
–100
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
1763 F05
Figure 5. Ceramic Capacitor Temperature Characteristics
1763fg
16
LT1763 Series
APPLICATIONS INFORMATION
Y5VandZ5Ucapacitors,butcanstillbesignificantenough
todropcapacitorvaluesbelowappropriatelevels.Capacitor
DC bias characteristics tend to improve as component
casesizeincreases, butexpectedcapacitanceatoperating
voltage should be verified.
Thermal Considerations
The power handling capability of the device will be limited
by the maximum rated junction temperature (125°C). The
power dissipated by the device will be made up of two
components:
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
similar to the way a piezoelectric accelerometer or
microphone works. For a ceramic capacitor, the stress
can be induced by vibrations in the system or thermal
transients. The resulting voltages produced can cause
appreciable amounts of noise, especially when a ceramic
capacitor isusedfor noisebypassing. A ceramic capacitor
producedFigure6’straceinresponsetolighttappingfroma
pencil.Similarvibrationinducedbehaviorcanmasquerade
as increased output voltage noise.
1. Output current multiplied by the input/output voltage
differential: (I )(V – V ), and
OUT
IN
OUT
2. GND pin current multiplied by the input voltage:
(I )(V ).
GND
IN
The GND pin current can be found by examining the GND
Pin Current curves in the Typical Performance Character-
istics section. Power dissipation will be equal to the sum
of the two components listed above.
TheLT1763seriesregulatorshaveinternalthermallimiting
designedtoprotectthedeviceduringoverloadconditions.
For continuous normal conditions, the maximum junction
temperature rating of 125°C must not be exceeded. It is
important to give careful consideration to all sources of
thermal resistance from junction-to-ambient. Additional
heat sources mounted nearby must also be considered.
LT1763-5
C
C
LOAD
= 10μF
= 0.01μF
= 100mA
OUT
BYP
I
V
For surface mount devices, heat sinking is accomplished
by using the heat spreading capabilities of the PC board
and its copper traces. Copper board stiffeners and plated
through-holes can also be used to spread the heat gener-
ated by power devices.
OUT
500μV/DIV
1763 F06
100ms/DIV
The following tables list thermal resistance for several
different board sizes and copper areas. All measurements
were taken in still air on 3/32" FR-4 board with one ounce
copper.
Figure 6. Noise Resulting from
Tapping on a Ceramic Capacitor
Table 1. DE Package, 12-Lead DFN
COPPER AREA
THERMAL RESISTANCE
BOARD AREA (JUNCTION-TO-AMBIENT)
TOPSIDE* BACKSIDE
2
2
2
2
2
2
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
40°C/W
45°C/W
50°C/W
60°C/W
2
2
2
2
1000mm
2
225mm
100mm
2
* Device is mounted on topside
1763fg
17
LT1763 Series
APPLICATIONS INFORMATION
Table 2. SO-8 Package, 8-Lead SO
Protection Features
COPPER AREA
The LT1763 regulators incorporate several protection
featureswhichmakethemidealforuseinbattery-powered
circuits. In addition to the normal protection features
associated with monolithic regulators, such as current
limiting and thermal limiting, the devices are protected
against reverse input voltages, reverse output voltages
and reverse voltages from output to input.
THERMAL RESISTANCE
BOARD AREA (JUNCTION-TO-AMBIENT)
TOPSIDE* BACKSIDE
2500mm2
1000mm2
225mm2
100mm2
50mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
60°C/W
60°C/W
68°C/W
74°C/W
86°C/W
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditionsattheoutputofthedevice.Fornormaloperation,
the junction temperature should not exceed 125°C.
* Device is mounted on topside
Calculating Junction Temperature
The input of the device will withstand reverse voltages of
20V. Current flow into the device will be limited to less
than 1mA (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.
Example: Given an output voltage of 3.3V, an input voltage
rangeof4Vto6V,anoutputcurrentrangeof0mAto250mA
and a maximum ambient temperature of 50°C, what will
the maximum junction temperature be?
The power dissipated by the device will be equal to:
I
(V
– V ) + I (V
)
OUT(MAX) IN(MAX)
OUT
GND IN(MAX)
The output of the LT1763-X can be pulled below ground
withoutdamagingthedevice.Iftheinputisleftopen-circuit
or grounded, the output can be pulled below ground by
20V. For fixed voltage versions, the output will act like a
largeresistor,typically500korhigher,limitingcurrentflow
to less than 100μA. For adjustable versions, the output
will act like an open circuit; no current will flow out of the
pin. If the input is powered by a voltage source, the output
will source the short-circuit current of the device and will
protect itself by thermal limiting. In this case, grounding
the SHDN pin will turn off the device and stop the output
from sourcing the short-circuit current.
where,
I
= 250mA
= 6V
OUT IN
OUT(MAX)
V
IN(MAX)
I
at (I
= 250mA, V = 6V) = 5mA
GND
So,
P = 250mA(6V – 3.3V) + 5mA(6V) = 0.71W
The thermal resistance will be in the range of 60°C/W to
86°C/W, depending on the copper area. So, the junction
temperature rise above ambient will be approximately
equal to:
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.
0.71W(75°C/W) = 53.3°C
The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature, or:
T
= 50°C + 53.3°C = 103.3°C
JMAX
In situations where the ADJ pin is connected to a resistor
divider that would pull the ADJ pin above its 7V clamp
voltageiftheoutputispulledhigh,theADJpininputcurrent
must be limited to less than 5mA. For example, a resistor
divider is used to provide a regulated 1.5V output from the
1.22V reference when the output is forced to 20V.
1763fg
18
LT1763 Series
APPLICATIONS INFORMATION
The top resistor of the resistor divider must be chosen to
limit the current into the ADJ pin to less than 5mA when
the ADJ pin is at 7V. The 13V difference between output
and ADJ pin divided by the 5mA maximum current into the
ADJ pin yields a minimum top resistor value of 2.6k.
When the IN pin of the LT1763-X is forced below the OUT
pin, or the OUT pin is pulled above the IN pin, input cur-
rent will typically drop to less than 2μA. This can happen
if the input of the device is connected to a discharged
(low voltage) battery and the output is held up by either
a backup battery or a second regulator circuit. The state
of the SHDN pin will have no effect on the reverse output
current when the output is pulled above the input.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled
to ground, pulled to some intermediate voltage or is left
open-circuit. Current flow back into the output will follow
the curve shown in Figure 7.
100
T
= 25°C
= 0V
J
IN
LT1763-1.5
V
90
80
70
60
50
40
30
20
10
0
CURRENT FLOWS
INTO OUTPUT PIN
V
= V
(LT1763)
OUT
ADJ
LT1763
LT1763-1.8
LT1763-2.5
LT1763-3
LT1763-5
LT1763-3.3
4
0
1
2
3
5
6
7
8
9
10
OUTPUT VOLTAGE (V)
1763 F07
Figure 7. Reverse Output Current
1763fg
19
LT1763 Series
PACKAGE DESCRIPTION
DE/UE Package
12-Lead Plastic DFN (4mm × 3mm)
(Reference LTC DWG # 05-08-1695 Rev D)
0.40 p 0.10
4.00 p0.10
(2 SIDES)
R = 0.115
TYP
7
12
0.70 p0.05
R = 0.05
TYP
3.30 p0.05
3.60 p0.05
3.30 p0.10
3.00 p0.10
(2 SIDES)
2.20 p0.05
PIN 1
TOP MARK
(NOTE 6)
1.70 p 0.05
1.70 p 0.10
PIN 1 NOTCH
R = 0.20 OR
PACKAGE
OUTLINE
0.35 s 45o
CHAMFER
(UE12/DE12) DFN 0806 REV D
6
1
0.25 p 0.05
0.75 p0.05
0.25 p 0.05
0.200 REF
0.50 BSC
0.50 BSC
2.50 REF
2.50 REF
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
NOTE:
1. DRAWING PROPOSED TO BE A VARIATION OF VERSION
(WGED) IN JEDEC PACKAGE OUTLINE M0-229
2. DRAWING NOT TO SCALE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 .005
.160 .005
.050 BSC
7
5
8
6
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.245
MIN
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.010 – .020
(0.254 – 0.508)
.030 .005
TYP
s 45°
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
NOTE:
INCHES
(MILLIMETERS)
1. DIMENSIONS IN
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.016 – .050
2. DRAWING NOT TO SCALE
(0.406 – 1.270)
SO8 0303
1763fg
20
LT1763 Series
REVISION HISTORY (Revision history begins at Rev G)
REV
DATE
DESCRIPTION
PAGE NUMBER
G
5/10
Updated Order Information to add MP-grade to all versions of DFN package
Revised Line Regulation section of Electrical Characteristics
Consolidated GND and exposed pad descriptions in Pin Descriptions section
Added LT3085 to Related Parts
2 to 4
5
14
22
1763fg
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
21
LT1763 Series
TYPICAL APPLICATION
Paralleling of Regulators for Higher Output Current
R1
0.1Ω
3.3V
1A
IN
OUT
SENSE
LT1763-3.3
+
+
C1
10μF
C2
10μF
V
> 3.8V
C4
0.01μF
IN
SHDN
BYP
GND
R2
0.1Ω
IN
OUT
C5
0.01μF
R6
LT1763
2k
BYP
ADJ
SHDN
SHDN
GND
R3
2.2k
R4
2.2k
R7
1.21k
8
3
2
R5
10k
+
1
1/2 LT1490
C3
–
4
0.01μF
1763 TA03
RELATED PARTS
PART NUMBER
LT1120
DESCRIPTION
125mA Low Dropout Regulator with 20μA I
COMMENTS
Includes 2.5V Reference and Comparator
Q
LT1121
150mA Micropower Low Dropout Regulator
700mA Micropower Low Dropout Regulator
30μA I , SOT-223 Package
Q
LT1129
50μA Quiescent Current
LT1175
500mA Negative Low Dropout Micropower Regulator
300mA Low Dropout Micropower Regulator with Shutdown
3A Low Dropout Regulator with 50μA I
45μA I , 0.26V Dropout Voltage, SOT-223 Package
Q
LT1521
15μA I , Reverse Battery Protection
Q
LT1529
500mV Dropout Voltage
Q
LT1613
1.4MHz Single-Cell Micropower DC/DC Converter
SOT-23 Package, Internally Compensated
LT1761 Series
LT1762 Series
LT1764A
LT1962
100mA, Low Noise, Low Dropout Micropower Regulators in SOT-23
150mA, Low Noise, LDO Micropower Regulators
20μA Quiescent Current, 20μV
25μA Quiescent Current, 20μV
Noise, ThinSOT™
Noise, MS8
RMS
RMS
3A, Fast Transient Response Low Dropout Regulator
300mA, Fast Transient Response Low Dropout Regulator
1.5A, Fast Transient Response Low Dropout Regulator
50mA, 80V Low Noise, LDO Micropower Regulator
340mV Dropout Voltage, DD, TO220
270mV Dropout Voltage, 20μV
340mV Dropout Voltage, 40μV
, MS8
RML
RML
LT1963A
LT3010
, DD, TO220, S8, SOT-223
300mV Dropout Voltage, MS8E
LT3021
500mA, Low Voltage, Very Low Dropout Linear Regulator
500mA Parallelable, Low Noise, Low Dropout Linear Regulator
160mV Dropout Voltage, DFN-8 and SOIC-8 Packages
LT3085
275mV Dropout Voltage (2 Supply Operation), MSOP-8 and
2mm × 3mm DFN-6 Packages
1763fg
LT 0510 REV G • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
22
●
●
© LINEAR TECHNOLOGY CORPORATION 1999
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
相关型号:
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LT1763IS8-1.5#TRPBF
LT1763 - 500mA, Low Noise, LDO Micropower Regulators; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C
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