LT3022IDHC-TRPBF [Linear]
1A, 0.9V to 10V, Very Low Dropout Linear Regulator; 1A ， 0.9V至10V ，非常低压差线性稳压器
| 型号： | LT3022IDHC-TRPBF |
| 厂家： | 
Linear |
| 描述： | 1A, 0.9V to 10V, Very Low Dropout Linear Regulator |
| 文件： | 总16页 (文件大小：325K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT3022
1A, 0.9V to 10V,
Very Low Dropout
Linear Regulator
FeaTures
DescripTion
The LT®3022 is a very low dropout voltage (VLDO™)
linear regulator that operates from single input supplies
down to 0.9V. The device supplies 1A output current
with 145mV typical dropout voltage. The LT3022 is ideal
for low input voltage to low output voltage applications,
providing comparable electrical efficiency to a switching
regulator. The regulator optimizes stability and transient
responsewithlowESRceramicoutputcapacitorsassmall
as 10µF. Other LT3022 features include 0.05% typical line
regulationand0.05%typicalloadregulation.Inshutdown,
quiescentcurrenttypicallydropsto7.5µA.Internalprotec-
tion circuitry includes reverse-battery protection, current
limiting, thermal limiting with hysteresis and reverse-cur-
rent protection.
n
V Range: 0.9V to 10V
IN
n
Dropout Voltage: 145mV Typical
n
Output Current: 1A
Adjustable Output (V
Stable with Low ESR, Ceramic Output Capacitors
(10µF Minimum)
n
= V
= 200mV)
OUT(MIN)
REF
n
n
n
n
n
n
n
n
0.05% Typical Load Regulation from 1mA to 1A
Quiescent Current: 400µA Typical
7.5µA Typical Quiescent Current in Shutdown
Current Limit Protection
Reverse-Battery Protection with No Reverse Current
Thermal Limiting with Hysteresis
16-Lead (5mm × 3mm) DFN and MSOP Packages
The LT3022 is available as an adjustable device with an
output voltage range down to the 200mV reference. The
LT3022 regulator is available in the thermally enhanced
low profile (0.75mm) 16-lead (5mm × 3mm) DFN and
MSOP packages.
applicaTions
n
High Efficiency Linear Regulators
n
Battery-Powered Systems
n
Logic Supplies
n
Post Regulator for Switching Supplies
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. VLDO is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
n
Wireless Modems
n
FPGA Core Supplies
Typical applicaTion
Minimum Input Voltage
1.1
I
= 1A
L
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.2V to 0.9V, 1A VLDO Regulator
V
0.9V
1A
OUT
V
IN
IN
OUT
ADJ
1.2V
698Ω
1%
10µF
10µF
LT3022
SHDN
GND
200Ω
1%
3022 TA01a
–50
0
25
50
75 100 125
–25
TEMPERATURE (°C)
3022 TA01b
3022f
ꢀ
LT3022
(Note 1)
absoluTe MaxiMuM raTings
IN Pin Voltage ........................................................ 10V
OUT Pin Voltage..................................................... 10V
Input-to-Output Differential Voltage....................... 10V
ADJ Pin Voltage..................................................... 10V
SHDN Pin Voltage .................................................. 10V
Output Short-Circuit Duration......................... Indefinite
Operating Junction Temperature Range
E-, I-Grades (Notes 2, 3)................... –40°C to 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP Package ................................................ 300°C
pin conFiguraTion
TOP VIEW
1
2
3
4
5
6
7
8
16 NC
15 NC
14 IN
NC
NC
TOP VIEW
1
2
3
4
5
6
7
8
NC
NC
IN
NC
NC
OUT
OUT
ADJ
AGND
AGND
NC
16
15
14
13
12
11
OUT
OUT
ADJ
13 IN
17
GND
17
GND
IN
IN
12 IN
PGND
11 PGND
10 PGND
AGND
AGND
NC
10 PGND
9
SHDN
MSE PACKAGE
16-LEAD PLASTIC MSOP
9
SHDN
T
= 125°C, θ = 38°C/W*, θ = 5°C/W TO 10°C/W
JA JC
JMAX
DHC PACKAGE
16-LEAD (5mm s 3mm) PLASTIC DFN
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
*SEE THE APPLICATIONS INFORMATION SECTION
T
JMAX
= 125°C, θ = 38°C/W*, θ = 4°C/W
JA JC
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
*SEE THE APPLICATIONS INFORMATION SECTION
orDer inForMaTion
LEAD FREE FINISH
LT3022EDHC#PBF
LT3022IDHC#PBF
LT3022EMSE#PBF
LT3022IMSE#PBF
LEAD BASED FINISH
LT3022EDHC
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3022EDHC#TRPBF
LT3022IDHC#TRPBF
LT3022EMSE#TRPBF
LT3022IMSE#TRPBF
TAPE AND REEL
3022
–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
–40°C to 125°C
–40°C to 125°C
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead Plastic MSOP
3022
3022
3022
16-Lead Plastic MSOP
PART MARKING*
3022
PACKAGE DESCRIPTION
LT3022EDHC#TR
LT3022IDHC#TR
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead Plastic MSOP
LT3022IDHC
3022
LT3022EMSE
LT3022EMSE#TR
LT3022IMSE#TR
3022
LT3022IMSE
3022
16-Lead Plastic MSOP
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/
3022f
ꢁ
LT3022
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage (Notes 4, 6)
I
I
= 1A, T > 0°C
0.9
0.9
1.05
1.10
V
V
LOAD
LOAD
A
= 1A, T ≤ 0°C
A
ADJ Pin Voltage (Notes 5, 6)
V
= 1.5V, I
= 1mA
LOAD
196
194
200
200
204
206
mV
mV
IN
l
l
1.15V < V < 10V, 1mA < I
< 1A
IN
LOAD
Line Regulation (Note 7)
Load Regulation (Note 7)
–1.5
–0.1
0.1
0.5
mV
∆V = 1.15V to 10V, I
= 1mA
LOAD
IN
–0.5
–1.0
0.5
1.0
mV
mV
V
IN
= 1.15V, ∆I
= 1mA to 1A
LOAD
l
l
l
l
l
Dropout Voltage (Notes 8, 9)
I
I
I
I
= 10mA
45
55
75
135
mV
mV
LOAD
LOAD
LOAD
LOAD
= 100mA
= 500mA
= 1A
90
175
mV
mV
110
145
150
235
mV
mV
185
285
mV
mV
GND Pin Current, V = V
+ 0.4V
I
I
I
I
I
= 0mA
= 1mA
= 100mA
= 500mA
= 1A
400
1.2
3.4
8.3
18
µA
mA
mA
mA
mA
IN
OUT(NOMINAL)
LOAD
LOAD
LOAD
LOAD
LOAD
l
l
l
l
(Notes 9, 10)
2.5
8.5
20
36
Output Voltage Noise
C
OUT
V
OUT
= 10µF, I
= 1.2V
= 1A, BW = 10Hz to 100kHz,
165
µV
RMS
LOAD
ADJ Pin Bias Current (Notes 7, 11)
Shutdown Threshold
V
= 0.2V, V = 1.5V
30
100
0.9
nA
ADJ
IN
l
l
V
= Off to On
= On to Off
0.64
0.64
V
V
OUT
OUT
V
0.25
l
l
SHDN Pin Current (Note 12)
V
SHDN
V
SHDN
= 0V, V = 10V
1
9.5
µA
µA
IN
= 10V, V = 10V
3
IN
Quiescent Current in Shutdown
Ripple Rejection (Note 13)
V
V
= 6V, V
= 0V
7.5
70
15
µA
dB
IN
SHDN
– V
= 1V, V
= 0.5V ,
P-P
55
IN
OUT
= 120Hz, I
RIPPLE
f
= 1A
RIPPLE
LOAD
Current Limit (Note 9)
V
V
= 10V, V
= 0V
2.6
1.7
A
A
IN
IN
OUT
l
l
= V
+ 0.5V, ∆V
≤ –5%
OUT
1.1
OUT(NOMINAL)
Input Reverse Leakage Current (Note 14)
Reverse Output Current (Notes 15, 16)
Minimum Required Output Current
V
V
V
= –10V, V
= 0V
4
20
5
µA
µA
IN
OUT
= 1.2V, V = 0V
0.1
OUT
IN
= 1.6V, V
= 1.2V
OUT
1
mA
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.
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 4: Minimum input voltage is the voltage required by the LT3022 to
Note 2: The LT3022 regulator is tested and specified under pulse load
regulate the output voltage and supply the rated 1A output current. This
conditions such that T ≈ T . The LT3022 is 100% tested at T = 25°C.
specification is tested at V
= 0.2V. For higher output voltages, the
J
A
A
OUT
Performance of the LT3022E over the full –40°C and 125°C operating
junction temperature range is assured by design, characterization and
correlation with statistical process controls. The LT3022I regulators are
guaranteed over the full –40°C to 125°C operating junction temperature
range. High junction temperatures degrade operating lifetime. Operating
lifetime is derated at junction temperatures greater than 125°C.
minimum input voltage required for regulation equals the regulated output
voltage V plus the dropout voltage or 1.1V, whichever is greater.
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 maximum input voltage. Limit the input-to-output
voltage differential range if operating at maximum output current.
OUT
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
3022f
ꢂ
LT3022
elecTrical characTerisTics
Note 6: The LT3022 typically supplies 1A output current with a 0.9V input
supply. The guaranteed minimum input voltage for 1A output current is
1.10V, especially if cold temperature operation is required.
Note 11: Adjust pin bias current flows out of the ADJ pin.
Note 12: Shutdown pin current flows into the SHDN pin.
Note 13: The LT3022 is tested and specified for this condition with an
Note 7: The LT3022 is tested and specified for these conditions with ADJ
tied to OUT.
Note 8: Dropout voltage is the minimum input to output voltage differential
external resistor divider (3.92k and 5.9k) setting V
to 0.5V. The external
OUT
resistor divider adds 50µA of load current. The specification refers to the
change in the 0.2V reference voltage, not the 0.5V output voltage.
needed to maintain regulation at a specified output current. In dropout the
Note 14: Input reverse leakage current flows out of the IN pin.
output voltage equals: (V – V
).
IN
DROPOUT
Note 15: Reverse output current is tested with IN grounded and OUT
forced to the rated output voltage. This current flows into the OUT pin and
out of the GND pin.
Note 9: The LT3022 is tested and specified for these conditions with
an external resistor divider (3.92k and 19.6k) setting V
external resistor divider adds 50µA of load current.
to 1.2V. The
OUT
Note 16: Reverse current is higher for the case of
Note 10: GND pin current is tested with V = V
+ 0.4V and a
IN
OUT(NOMINAL)
(rated_output) < V
< V , because the no-load recovery
OUT
IN
current source load. GND pin current increases in dropout. See GND pin
current curves in the Typical Performance Characteristics section.
circuitry is active in this region and is trying to restore the
output voltage to its nominal value.
Typical perForMance characTerisTics
Dropout Voltage
Guaranteed Dropout Voltage
Dropout Voltage
300
270
240
210
180
150
120
90
300
270
240
210
180
150
120
90
300
270
240
210
180
150
120
90
V
= 1.2V
= TEST POINTS
V
= 1.2V
OUT
OUT
T = 125°C
J
T = 125°C
J
I
= 1A
L
T = 25°C
T = 25°C
J
J
I
= 500mA
L
I
= 100mA
L
T = –40°C
J
60
60
60
I
L
= 10mA
30
30
30
0
0
0
0
100 200 300 400 500 600 700 800 9001000
0
100 200 300 400 500 600 700 800 9001000
–50
0
25
50
75 100 125
–25
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
3022 G01
3022 G02
3022 G03
Minimum Input Voltage
ADJ Pin Voltage
206
204
202
200
1.1
1.0
0.9
I
= 1A
I
L
= 1mA
L
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
198
196
194
–50
0
25
50
75 100 125
–50
25
50
75
100 125
–25
–25
0
TEMPERATURE (°C)
TEMPERATURE (°C)
3022 G04
3022 G05
3022f
ꢃ
LT3022
Typical perForMance characTerisTics
ADJ Pin Bias Current
Quiescent Current
Quiescent Current
100
90
80
70
60
50
40
30
20
10
0
1000
900
800
700
600
500
400
300
200
100
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
I
J
= 1.2V
V
V
I
= 6V
OUT
= 0
OUT
= 0
IN
= 1.2V
L
T = 25°C
L
V
= V
IN
V
= V
IN
SHDN
SHDN
V
5
= 0V
SHDN
V
= 0V
SHDN
–50
0
25
50
75 100 125
–25
50
TEMPERATURE (°C)
125
0
1
2
3
4
6
7
8
9
10
–50
0
25
75 100
–25
TEMPERATURE (°C)
INPUT VOLTAGE (V)
3022 G06
3022 G08
3022 G07
Quiescent Current
Quiescent Current
GND Pin Current
24
21
18
15
12
9
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
J
= 1.2V
V
I
J
= 1.5V
V
I
= 1.8V
OUT
OUT
= 0
OUT
= 0
T = 25°C
L
L
T = 25°C
T = 25°C
J
R
= 1.2Ω
= 1A
L
I
L
V
= V
V
= V
SHDN IN
SHDN
IN
R
L
= 2.4Ω
L
R
L
= 120Ω
= 10mA
L
I
= 500mA
R
L
= 1.2k
= 1mA
L
I
I
R
L
= 12Ω
L
6
I
= 100mA
V
5
= 0V
V
5
= 0V
SHDN
SHDN
3
0
0
1
2
3
4
6
7
8
9
10
0
1
2
3
4
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3022 G09
3022 G10
3022 G11
GND Pin Current
GND Pin Current
24
21
18
15
12
9
24
21
18
15
12
9
V
J
= 1.5V
V
J
= 1.8V
OUT
OUT
T
= 25°C
T
= 25°C
R
= 1.5Ω
L
L
R
L
I
= 1.8Ω
L
I
= 1A
= 1A
R
L
= 3.6Ω
L
R
L
= 3Ω
L
I
= 500mA
R
I
= 150Ω
= 10mA
L
R
L
I
= 1.5k
= 1mA
R
I
= 1.8k
= 1mA
R
L
= 180Ω
= 10mA
I
= 500mA
L
L
L
I
L
L
R = 15Ω
L
= 100mA
L
6
6
R
L
= 18Ω
L
I
I
= 100mA
3
3
0
0
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3022 G12
3022 G13
3022f
ꢄ
LT3022
Typical perForMance characTerisTics
GND Pin Current vs ILOAD
SHDN Pin Threshold
SHDN Pin Input Current
24
21
18
15
12
9
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
T = 25°C
J
V
V
V
= 1.6V
I
L
= 1mA
IN
= 1.2V
OUT
= 10V
SHDN
T = 25°C
J
6
3
0
0
100 200 300 400 500 600 700 800 9001000
–50
0
25
50
75
125
0
1
2
3
4
5
6
7
8
9
10
–25
100
TEMPERATURE (°C)
LOAD CURRENT (mA)
SHDN PIN VOLTAGE (V)
3022 G14
3022 G15
3022 G16
SHDN Pin Input Current
Current Limit
Reverse Input Leakage Current
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
6
5
4
3
0
–2
V
OUT
= 0V
V
V
= 10V
IN
SHDN
= 10V
V
= 10V
IN
–4
–6
V
= 1.7V
IN
–8
–10
–12
–14
–16
–18
–20
2
1
0
V
V
J
= 0V
SHDN
= 25°C
OUT
= 10V
T
50
TEMPERATURE (°C)
100 125
–50
0
25
50
75
125
–50 –25
0
25
75
–25
100
0
–1 –2 –3 –4 –5 –6 –7 –8 –9 –10
TEMPERATURE (°C)
INPUT VOLTAGE (V)
3022 G17
3022 G18
3022 G19
Reverse Input Leakage Current
Reverse Output Current
Input Ripple Rejection
0
–2
100
90
120
100
80
V
V
= 0V
V
V
= 1.5V + 50mV
OUT
I = 1A
L
RIPPLE
RMS
IN
IN
= 1.2V
= 0.5V
OUT
OUT
I
I
FLOWS INTO OUT PIN
–4
80
FLOWS OUT OF IN PIN
T = 25°C
J
IN
–6
70
C
= 47µF
OUT
–8
60
50
–10
–12
–14
–16
–18
–20
60
40
30
20
10
0
C
= 10µF
40
20
0
OUT
V
V
V
= –10V
= 0V
SHDN
IN
OUT
I
OUT
= 10V
I
IN
–50
0
25
50
75 100 125
–50
25
50
75
100 125
–25
–25
0
10
100
1k
10k 100k
1M
10M
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (Hz)
3022 G22
3022 G20
3022 G21
3022f
ꢅ
LT3022
Typical perForMance characTerisTics
Input Ripple Rejection
Line Regulation
Load Regulation
100
90
80
70
60
50
40
30
20
10
0
1.0
0.8
0.5
0.3
V
V
= 1.15V
= 0.5V
$V = 1.15V TO 10V
IN
OUT
IN
OUT
= 1mA
V
I
= 0.2V
$I = 1mA TO 1A
L
L
0.6
0.1
LOAD REGULATION NUMBER REFERS
TO CHANGE IN THE 200mV REFERENCE
VOLTAGE
0.4
–0.1
–0.3
–0.5
–0.7
–0.9
–1.1
–1.3
–1.5
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
V
V
C
= 1.5V + 0.5V RIPPLE AT 120Hz
P-P
IN
= 0.5V
= 10µF
OUT
OUT
= 1A
I
L
–50
0
25
50
75 100 125
–50
0
25
50
75 100 125
–25
–50
0
25
50
75
125
–25
–25
100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3022 G23
3022 G25
3022 G24
No-Load Recovery Threshold
No-Load Recovery Threshold
Output Noise Spectral Density
10
1
30
25
12
10
8
T = 25°C
J
V
L
= 1.2V
OUT
I
= 1A
T = 25°C
J
20
15
I
I
= 5mA
= 1mA
OUT(SINK)
C
= 10µF
OUT
0.1
6
C
= 47µF
OUT
OUT(SINK)
10
5
4
2
0
0.01
0.001
0
0
5
10
15
20
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
10
100
1k
10k
100k
1M
OUTPUT OVERSHOOT (%)
FREQUENCY (Hz)
3022 G28
3022 G26
3022 G27
RMS Output Noise vs Load
Current (10Hz to 100kHz)
Start-Up from Shutdown
Transient Response
200
180
160
140
V
C
= 1.2V
= 10µF
OUT
OUT
T
= 25°C
J
V
V
OUT
OUT
50mV/DIV
0.5V/DIV
120
100
I
OUT
V
SHDN
80
60
40
20
0
500mA/DIV
1V/DIV
3022 G30
3022 G31
R
V
= 1.2Ω
= 1.5V
= 1.2V
= 10µF
50µs/DIV
V
V
I
= 1.5V
50µs/DIV
L
IN
IN
OUT
= 1.2V
V
C
= 100mA to 1A
= 22µF
OUT
OUT
OUT
OUT
C
0.01
0.1
1
10
100
1000
t
= t
= 100ns
RISE FALL
LOAD CURRENT (mA)
3022 G29
3022f
ꢆ
LT3022
pin FuncTions
NC (Pins 1, 2, 8, 15, 16): No Connect Pins. These pins
PGND (Pins 10, 11): Power Ground. The majority of
ground pin current flows out of PGND. Tie these pins
directly to AGND (Pins 6, 7) and the exposed backside
GND (Pin 17).
have no connection to internal circuitry. These pins may
be floated, tied to V or tied to GND for improved thermal
IN
performance.
OUT (Pins 3, 4): These pins supply power to the load.
Use a minimum output capacitor of 10µF to prevent os-
cillations. Large load transient applications require larger
output capacitors to limit peak voltage transients. See the
Applications Information section for more information on
outputcapacitanceandreverse-outputcharacteristics.The
LT3022 requires a 1mA minimum load current to ensure
proper regulation and stability.
IN(Pins12,13,14):Thesepinssupplypowertothedevice.
The LT3022 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 rises with frequency. A
minimum bypass capacitor of 10µF suffices. The LT3022
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
LT3022 behaves as if a diode is in series with its input.
No reverse current flows into the LT3022 and no reverse
voltage appears at the load. The device protects itself and
the load.
ADJ (Pin 5): This pin is the error amplifier inverting ter-
minal. Its 30nA typical input bias current flows out of the
pin (see curve of ADJ Pin Bias Current vs Temperature
in the Typical Performance Characteristics). The ADJ pin
reference voltage is 200mV (referred to AGND).
GND (Pin 17): Exposed Pad. Tie this pin directly to AGND
(Pins 6, 7), PGND (Pins 10, 11) and the PCB ground. This
pin provides enhanced thermal performance with its con-
nection to the PCB ground. See the Applications Informa-
tion section for thermal considerations and calculating
junction temperature.
AGND (Pins 6, 7): Analog Ground. Tie these pins directly
to PGND (Pins 10, 11) and the exposed backside GND
(Pin 17). Connect the bottom of the external resistor
divider, setting output voltage, directly to AGND for op-
timum regulation.
SHDN (Pin 9): Pulling the SHDN pin low puts the LT3022
into a low power state and turns the output off. Drive the
SHDNpinwitheitherlogicoranopen-collector/draindevice
with a pull-up resistor. The resistor supplies the pull-up
current to the open collector/drain logic, normally several
microamperes, and the SHDN pin current, typically 3µA.
If unused, connect the SHDN pin to V . The LT3022 does
IN
not function if the SHDN pin is not connected.
3022f
ꢇ
LT3022
block DiagraM
IN
SHDN
THERMAL
SHUTDOWN
12, 13, 14
SHUTDOWN
9
R3
D1
–
Q3
ERROR
AMP
CURRENT
GAIN
Q1
+
PGND
10, 11
D2
OUT
3, 4
200mV
BIAS CURRENT
AND
REFERENCE
GENERATOR
–
213mV
NO-LOAD
Q2
RECOVERY
R2
+
25k
ADJ
5
NOTE:
IDEAL
DIODE
R1
R1 AND R2 ARE EXTERNAL
AGND
6, 7
TIE PGND, AGND AND THE EXPOSED PAD TOGETHER
3022 BD
applicaTions inForMaTion
The LT3022 very low dropout linear regulator is capable of
0.9V input supply operation. It supplies 1A output current
and dropout voltage is typically 145mV. Quiescent current
is typically 400µA and drops to 7.5µA in shutdown. The
LT3022 incorporates several protection features, making
it ideal for use in battery-powered systems. The device
protects itself against reverse-input and reverse-output
voltages. If the output is held up by a backup battery when
theinputispulledtogroundinabatterybackupapplication,
theLT3022behavesasifadiodeisinserieswithitsoutput,
preventingreversecurrentflow.Indualsupplyapplications
where the regulator load is returned to a negative supply,
pulling the output below ground by as much as 10V does
not affect start-up or normal operation.
Technologyrecommendschoosingresistordividervalues
to satisfy this requirement. A 200Ω R1 value sets a 1mA
resistor divider current. In shutdown, the output is off and
the divider current is zero. Curves of ADJ Pin Voltage vs
TemperatureandADJPinBiasCurrentvsTemperatureap-
pear in the Typical Performance Characteristics section.
Specifications for output voltages greater than 200mV
are proportional to the ratio of desired output voltage to
200mV (V /200mV). For example, load regulation for
OUT
an output current change of 1mA to 1A is typically 0.1mV
at V
= 200mV. At V
= 1.5V, load regulation is:
ADJ
OUT
1.5V
200mV
•0.1mV=750µV
Adjustable Operation
IN
OUT
ADJ
V
OUT
+
V
IN
R2
LT3022
TheLT3022’soutputvoltagerangeis0.2Vto9.5V. Figure 1
shows that the external resistor ratio sets output voltage.
The device regulates the output to maintain ADJ at 200mV
referred to ground. R1’s current equals 200mV/R1. R2’s
current is R1’s current minus the ADJ pin bias current.
The 30nA ADJ pin bias current flows out of the pin. Use
Figure 1’s formula to calculate output voltage. Given the
LT3022’s 1mA minimum load current requirement, Linear
SHDN
GND
R1
3022 F01
V
V
I
: 200mV • (1 + R2/R1) – (I
• R2)
OUT
ADJ
ADJ
: 200mV
: 30nA AT 25°C
OUTPUT RANGE: 0.2V TO 9.5V
ADJ
Figure 1. Adjustable Operation
3022f
ꢈ
LT3022
applicaTions inForMaTion
Table1shows1%resistordividervaluesforsomecommon
output voltages with a resistor divider current equaling or
about 1mA.
20
0
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
X5R
–20
–40
–60
–80
–100
Table 1
V
(V)
R1 (Ω)
200
R2 (Ω)
698
OUT
0.9
1.0
1.2
1.5
1.8
2.5
3.3
187
750
Y5V
200
1000
1300
1500
2150
3090
200
0
8
12 14
2
4
6
10
16
187
DC BIAS VOLTAGE (V)
3022 F02
187
200
Figure 2. Ceramic Capacitor DC Bias Characteristics
Output Capacitance and Transient Response
The LT3022’s design is stable with a wide range of output
capacitors,butisoptimizedforlowESRceramiccapacitors.
The output capacitor’s ESR affects stability, most notably
with small value capacitors. Use a minimum output ca-
pacitor of 10µF with an ESR of less than 0.1Ω to prevent
oscillations. TheLT3022isalowvoltagedeviceandoutput
loadtransientresponseisafunctionofoutputcapacitance.
Larger values of output capacitance decrease the peak
deviations and provide improved transient response for
large load current changes.
40
20
X5R
0
–20
–40
Y5V
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
–100
–50 –25
0
25
50
TEMPERATURE (°C)
75
100 125
Ceramic capacitors require extra consideration. Manufac-
turersmakeceramiccapacitorswithavarietyofdielectrics;
each with a different behavior across temperature and
applied voltage. The most common dielectrics are Z5U,
Y5V, X5R and X7R. Z5U and Y5V dielectrics provide high
C-V products in a small package at low cost, but exhibit
strong voltage and temperature coefficients. X5R and
X7R dielectrics yield highly stable characteristics and are
moresuitableforuseastheoutputcapacitoratfractionally
increasedcost.X5RandX7Rdielectricsbothexhibitexcel-
lent voltage coefficient characteristics. X7R works over a
larger temperature range and exhibits better temperature
stability whereas X5R is less expensive and is available
in higher values. Figures 2 and 3 show voltage coefficient
and temperature coefficient comparisons between Y5V
and X5R material.
3022 F03
Figure 3. Ceramic Capacitor Temperature Characteristics
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 micro-
phone 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
amountsofnoise.AceramiccapacitorproducedFigure 4’s
trace in response to light tapping from a pencil. Similar
vibration induced behavior can masquerade as increased
output voltage noise.
3022f
ꢀ0
LT3022
applicaTions inForMaTion
If external circuitry forces the output above the no-load
recovery circuit’s threshold, the current sink turns on in
an attempt to restore the output voltage to nominal. The
currentsinkremainsonuntiltheexternalcircuitryreleases
theoutput.However,iftheexternalcircuitrypullstheoutput
voltage above the input voltage or the input falls below the
output, the LT3022 turns the current sink off and shuts
down the bias current/reference generator circuitry.
1mV/DIV
3022 F04
Thermal Considerations
V
C
I
= 1.3V
= 10µF
= 0
1ms/DIV
OUT
OUT
LOAD
The LT3022’s maximum rated junction temperature of
125°Climitsitspowerhandlingcapability.Twocomponents
comprise the power dissipation of the device:
Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor
1. Outputcurrentmultipliedbytheinput-to-outputvoltage
differential:
No-Load/Light-Load Recovery
(I
) • (V – V ) and
IN OUT
A possible transient load step that occurs is where the
output current changes from its maximum level to zero
current or a very small load current. The output voltage
responds by overshooting until the regulator lowers the
amountofcurrentitdeliverstothenewlevel.Theregulator
loop response time and the amount of output capacitance
control the amount of overshoot. Once the regulator has
decreased its output current, the current provided by
LOAD
2. GND pin current multiplied by the input voltage:
(I ) • (V )
GND
IN
GNDpincurrentisfoundbyexaminingtheGNDpincurrent
curves in the Typical Performance Characteristics. Power
dissipation equals the sum of the two components listed.
The LT3022’s internal thermal limiting (with hysteresis)
protects the device during overload conditions. For nor-
mal continuous conditions, do not exceed the maximum
junction temperature rating of 125°C. Carefully consider
all sources of thermal resistance from junction to ambi-
ent including other heat sources mounted in proximity to
the LT3022.
the resistor divider (which sets V ) is the only current
OUT
remaining to discharge the output capacitor from the level
to which it overshot. The amount of time it takes for the
output voltage to recover easily extends to milliseconds
with minimum divider current and many microfarads of
output capacitance.
The underside of the LT3022 DHC and MSE packages
has exposed metal from the lead frame to the die attach-
ment. Heat transfers directly from the die junction to the
printed circuit board metal, allowing maximum junction
temperature control. The dual-in-line pin arrangement
allows metal to extend beyond the ends of the package
on the topside (component side) of a PCB. Connect this
metal to GND on the PCB. The multiple IN and OUT pins
of the LT3022 also assist in spreading heat to the PCB.
Copper board stiffeners and plated throughholes can also
be used to spread the heat generated by power devices.
To eliminate this problem, the LT3022 incorporates a
no-load or light load recovery circuit. This circuit is a
voltage-controlledcurrentsinkthatsignificantlyimproves
the light load transient response time by discharging the
output capacitor quickly and then turning off. The current
sink turns on when the output voltage exceeds 6.5% of
the nominal output voltage. The current sink level is then
proportional to the overdrive above the threshold up to a
maximum of about 24mA. Consult the curve in the Typical
Performance Characteristics for the No-Load Recovery
Threshold.
3022f
ꢀꢀ
LT3022
applicaTions inForMaTion
The following tables list thermal resistance as a function
of copper area in a fixed board size. All measurements are
taken in still air on a 4-layer FR-4 board with 1oz solid
internal planes, and 2oz external trace planes with a total
board thickness of 1.6mm. For more information on ther-
mal resistance and high thermal conductivity test boards,
refer to JEDEC standard JESD51, notably JESD51-12 and
JESD51-7. Achieving low thermal resistance necessitates
attention to detail and careful PCB layout.
The thermal resistance is about 38°C/W depending on
the copper area. So the junction temperature rise above
ambient is approximately equal to:
0.434W • (38°C/W) = 16.5°C
The maximum junction temperature equals the maximum
junctiontemperatureriseaboveambientplusthemaximum
ambient temperature or:
T
= 85°C + 16.5°C = 101.5°C
JMAX
Table 2. Measured Thermal Resistance for DHC Package
Protection Features
COPPER AREA
THERMAL RESISTANCE
The LT3022 incorporates several protection features that
make it ideal for use in battery-powered circuits. In ad-
dition to the normal protection features associated with
monolithicregulators,suchascurrentlimitingandthermal
limiting, the device also protects against reverse-input
voltages, reverse-output voltages and reverse output-to-
input voltages.
TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT)
2
2
2
2
2
2
2
2
2
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
35°C/W
37°C/W
38°C/W
40°C/W
2
1000mm
2
225mm
100mm
2
*Device is mounted on topside
Table 3. Measured Thermal Resistance for MSE Package
COPPER AREA
Current limit protection and thermal overload protection
protectthedeviceagainstcurrentoverloadconditionsatits
output.Fornormaloperation,donotexceed125°Cjunction
temperature. The typical thermal shutdown temperature
is 165°C and the thermal shutdown circuit incorporates
about 7°C of hysteresis.
THERMAL RESISTANCE
TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT)
2
2
2
2
2
2
2
2
2
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
35°C/W
37°C/W
38°C/W
40°C/W
2
1000mm
2
225mm
100mm
2
*Device is mounted on topside.
The IN pins withstand reverse voltages of 10V. The LT3022
limitscurrentflowtolessthan1µAandnonegativevoltage
appears at OUT. The device protects both itself and the
load against batteries that are plugged in backwards.
Calculating Junction Temperature
Example: Given an output voltage of 1.5V, an input voltage
range of 1.7V to 1.9V, an output load current range of 1mA
to 1A and a maximum ambient temperature of 85°C, what
is the maximum junction temperature for an application
using the DHC package?
The LT3022 incurs no damage if OUT is pulled below
ground. If IN is left open-circuited or grounded, OUT can
be pulled below ground by 10V. No current flows from the
pass transistor connected to OUT. However, current flows
in (but is limited by) the resistor divider that sets the out-
put voltage. Current flows from the bottom resistor in the
divider and from the ADJ pin’s internal clamp through the
top resistor in the divider to the external circuitry pulling
OUT below ground. If IN is powered by a voltage source,
OUT sources current equal to its current limit capability
and the LT3022 protects itself by thermal limiting. In this
case, grounding SHDN turns off the LT3022 and stops
OUT from sourcing current.
The power dissipated by the device equals:
I
• (V
) – V ) + I
• (V
)
LOAD(MAX)
IN(MAX
OUT
GND
IN(MAX)
where:
I
= 1A
LOAD(MAX)
V
= 1.9V
IN(MAX)
I
at (I = 1A, V = 1.9V) = 18mA
LOAD IN
GND
so:
P = 1A • (1.9V – 1.5V) + 18mA • (1.9V) = 0.434W
3022f
ꢀꢁ
LT3022
applicaTions inForMaTion
The LT3022 incurs no damage if the ADJ pin is pulled
above or below ground by 10V. If IN is left open-circuited
or grounded and ADJ is pulled above ground, ADJ acts
like a 25k resistor in series with two diodes. ADJ acts like
a 25k resistor if pulled below ground. If IN is powered by a
voltagesourceandADJispulledbelowitsreferencevoltage,
the LT3022 attempts to source its current limit capability
an output load current of greater than 20mA may result
in instability. The resonant LC tank circuit formed by the
wire inductance and the input capacitor is the cause and
not a result of LT3022 instability.
The self-inductance, or isolated inductance, of a wire
is directly proportional to its length. However, the wire
diameter has less influence on its self inductance. For
example, the self-inductance of a 2-AWG isolated wire
with a diameter of 0.26" is about half the inductance of a
30-AWGwirewithadiameterof0.01". Onefootof30-AWG
wire has 465nH of self-inductance.
at OUT. The output voltage increases to V – V
IN
DROPOUT
with V
set by whatever load current the LT3022
DROPOUT
supports. This condition can potentially damage external
circuitry powered by the LT3022 if the output voltage in-
creases to an unregulated high voltage. If IN is powered
by a voltage source and ADJ is pulled above its reference
voltage, two situations can occur. If ADJ is pulled slightly
above its reference voltage, the LT3022 turns off the pass
transistor, no output current is sourced and the output
voltage decreases to either the voltage at ADJ or less. If
ADJ is pulled above its no-load recovery threshold, the
no-load recovery circuitry turns on and attempts to sink
current. OUT is actively pulled low and the output voltage
clampsataSchottkydiodeaboveground. Pleasenotethat
thebehaviordescribedaboveappliestotheLT3022only. If
a resistor divider is connected under the same conditions,
there will be additional V/R current.
Several methods exist to reduce a wire’s self-inductance.
One method divides the current flowing towards the
LT3022 between two parallel conductors. In this case,
placing the wires further apart reduces the inductance;
up to a 50% reduction when placed only a few inches
apart. Splitting the wires connects two equal inductors
in parallel. However, when placed in close proximity to
each other, mutual inductance adds to the overall self
inductance of the wires. The most effective technique to
reducing overall inductance is to place the forward and
return current conductors (the input wire and the ground
wire) in close proximity. Two 30-AWG wires separated by
0.02" reduce the overall self-inductance to about one-fifth
of a single wire.
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, pulledtosomeintermediatevoltageorisleftopen
circuit. In the case where the input is grounded, there is
less than 1µA of reverse output current. If the LT3022 IN
pin is forced below the OUT pin or the OUT pin is pulled
above the IN pin, input current drops to less than 10µA
typically. This occurs if the LT3022 input is connected to
a discharged (low voltage) battery and either a backup
battery or a second regulator circuit holds up the output.
The state of the SHDN pin has no effect on the reverse
output current if OUT is pulled above IN.
Ifabattery,mountedincloseproximity,powerstheLT3022,
a 10µF input capacitor suffices for stability. However,
if a distantly located supply powers the LT3022, use a
larger value input capacitor. Use a rough guideline of 1µF
(in addition to the 10µF minimum) per 8 inches of wire
length. The minimum input capacitance needed to stabi-
lize the application also varies with power supply output
impedance variations. Placing additional capacitance on
the LT3022’s output also helps. However, this requires
an order of magnitude more capacitance in comparison
with additional LT3022 input bypassing. Series resistance
between the supply and the LT3022 input also helps stabi-
lize the application; as little as 0.1Ω to 0.5Ω suffices. This
impedance dampens the LC tank circuit at the expense of
dropout voltage. A better alternative is to use higher ESR
tantalum or electrolytic capacitors at the LT3022 input in
place of ceramic capacitors.
Input Capacitance and Stability
The LT3022 design is stable with a minimum of 10µF
capacitor placed at the IN pin. Very low ESR ceramic
capacitors may be used. However, in cases where long
wires connect the power supply to the LT3022’s input and
ground, use of low value input capacitors combined with
3022f
ꢀꢂ
LT3022
package DescripTion
DHC Package
16-Lead Plastic DFN (5mm × 3mm)
(Reference LTC DWG # 05-08-1706)
0.65 p0.05
3.50 p0.05
1.65 p0.05
2.20 p0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 p 0.05
0.50 BSC
4.40 p0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
TYP
0.40 p 0.10
5.00 p0.10
(2 SIDES)
9
16
R = 0.20
TYP
3.00 p0.10 1.65 p 0.10
(2 SIDES)
(2 SIDES)
PIN 1
TOP MARK
(SEE NOTE 6)
PIN 1
NOTCH
(DHC16) DFN 1103
8
1
0.25 p 0.05
0.75 p0.05
0.200 REF
0.50 BSC
4.40 p0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC
PACKAGE OUTLINE MO-229
2. DRAWING NOT TO SCALE
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
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
3022f
ꢀꢃ
LT3022
package DescripTion
MSE Package
16-Lead Plastic MSOP, Exposed Die Pad
(Reference LTC DWG # 05-08-1667 Rev A)
BOTTOM VIEW OF
EXPOSED PAD OPTION
2.845 p 0.102
(.112 p .004)
2.845 p 0.102
(.112 p .004)
0.889 p 0.127
(.035 p .005)
1
8
0.35
REF
5.23
(.206)
MIN
1.651 p 0.102
(.065 p .004)
1.651 p 0.102
(.065 p .004)
3.20 – 3.45
(.126 – .136)
0.12 REF
DETAIL “B”
CORNER TAIL IS PART OF
THE LEADFRAME FEATURE.
FOR REFERENCE ONLY
DETAIL “B”
16
9
0.305 p 0.038
0.50
(.0197)
BSC
NO MEASUREMENT PURPOSE
4.039 p 0.102
(.159 p .004)
(NOTE 3)
(.0120 p .0015)
TYP
0.280 p 0.076
(.011 p .003)
RECOMMENDED SOLDER PAD LAYOUT
16151413121110
9
REF
DETAIL “A”
0o – 6o TYP
0.254
(.010)
3.00 p 0.102
(.118 p .004)
(NOTE 4)
4.90 p 0.152
(.193 p .006)
GAUGE PLANE
0.53 p 0.152
(.021 p .006)
1 2 3 4 5 6 7 8
DETAIL “A”
0.86
(.034)
REF
1.10
(.043)
MAX
0.18
(.007)
SEATING
PLANE
0.17 – 0.27
(.007 – .011)
TYP
0.1016 p 0.0508
(.004 p .002)
MSOP (MSE16) 0608 REV A
0.50
(.0197)
BSC
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
3022f
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.
ꢀꢄ
LT3022
Typical applicaTion
1.5V to 1.2V, 1A VLDO Regulator
V
1.2V
1A
OUT
V
IN
IN
OUT
ADJ
1.5V
1k
10µF
10µF
LT3022
1%
SHDN
GND
200Ω
1%
3022 TA02
relaTeD parTs
PART NUMBER
DESCRIPTION
COMMENTS
LT3020
100mA, Low Voltage VLDO Linear Regulator
V : 0.9V to 10V, V : 0.2V to 9.5V, V = 0.15V, I = 120µA,
IN
OUT
DO
Q
Noise: <250µV
, Stable with 2.2µF Ceramic Capacitors, DFN-8,
RMS
MS8 Packages
LT3021
500mA, Low Voltage, VLDO Linear Regulator
V : 0.9V to 10V, Dropout Voltage: 160mV Typical, Adjustable Output
IN
(V = V
= 200mV), Fixed Output Voltages: 1.2V, 1.5V, 1.8V, Stable
OUT(MIN)
REF
with Low ESR, Ceramic Output Capacitors, 16-Pin DFN (5mm × 5mm) and
8-Lead SO Packages
LTC®3025
300mA Micropower VLDO Linear Regulator
V
= 0.9V to 5.5V, Dropout Voltage: 45mV, Low Noise 80µV
Q
,
IN
RMS
Low I : 54µA, 2mm × 2mm 6-Lead DFN Package
LTC3025-1/LTC3025-2/ 500mA Micropower VLDO Linear Regulator in
V = 0.9V to 5.5V, Dropout Voltage: 75mV, Low Noise 80µV
IN
,
RMS
LTC3025-3/LTC3025-4
2mm × 2mm DFN
Low I : 54µA, Fixed Output: 1.2V (LTC3025-2), 1.5V (LTC3025-3),
Q
1.8V (LTC3025-4); Adjustable Output Range: 0.4V to 3.6V (LTC3025-1),
2mm × 2mm 6-Lead DFN Package
LTC3026
1.5A, Low Input Voltage VLDO Linear Regulator V : 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V),
IN
V
= 0.1V, I = 950µA, Stable with 10µF Ceramic Capacitors, 10-Lead
Q
DO
MSOP and DFN-10 Packages
LT3029
Dual 500mA/500mA, Low Dropout, Low Noise, Output Current: 500mA per Channel, Low Dropout Voltage: 300mV Low
Micropower Linear Regulator
Noise: 20µV
(10Hz to 100kHz), Low Quiescent Current: 55µA per Channel,
RMS
Wide Input Voltage Range: 1.8V to 20V (Common or Independent Input
Supply), Adjustable Output: 1.215V Reference, Very Low Quiescent Current
in Shutdown: <1µA per Channel Stable with 3.3µF Minimum Output Capacitor,
Stable with Ceramic, Tantalum or Aluminum Electrolytic Capacitors, Reverse-
Battery, Reverse-Output and Reverse Output-to-Input Protection, Thermally
Enhanced 16-Lead MSOP and 16-Lead (4mm × 3mm) DFN Packages
LTC3035
300mA VLDO Linear Regulator with Charge
Pump Bias Generator
V = 1.7V to 5.5V, V : 0.4V to 3.6V, Dropout Voltage: 45mV, I : 100µA,
IN OUT Q
3mm × 2mm DFN-8
LT3080/LT3080-1
1.1A, Parallelable, Low Noise, Low Dropout
Linear Regulator
300mV Dropout Voltage (2-Supply Operation), Low Noise: 40µV
,
RMS
V : 1.2V to 36V, V : 0V to 35.7V, Current-Based Reference with 1-Resistor
IN
OUT
OUT
V
Set; Directly Parallelable (No Op Amp Required), Stable with Ceramic
Capacitors, TO-220, SOT-223, MSOP-8 and 3mm × 3mm DFN-8 Packages;
LT3080-1 Has Integrated Internal Ballast Resistor
LT3085
500mA, Parallelable, Low Noise, Low Dropout
Linear Regulator
275mV Dropout Voltage (2-Supply Operation), Low Noise: 40µV
,
RMS
V : 1.2V to 36V, V : 0V to 35.7V, Current-Based Reference with 1-Resistor
IN
V
OUT
Set; Directly Parallelable (No Op Amp Required), Stable with Ceramic
OUT
Capacitors, MSOP-8 and 2mm × 3mm DFN-6 packages
3022f
LT 0410 • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
ꢀꢅ
●
●
LINEAR TECHNOLOGY CORPORATION 2010
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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