LT3021IS8-1.8 [Linear]
IC VREG 1.8 V FIXED POSITIVE LDO REGULATOR, 0.285 V DROPOUT, PDSO8, 0.150 INCH, PLASTIC, SOP-8, Fixed Positive Single Output LDO Regulator;型号: | LT3021IS8-1.8 |
厂家: | Linear |
描述: | IC VREG 1.8 V FIXED POSITIVE LDO REGULATOR, 0.285 V DROPOUT, PDSO8, 0.150 INCH, PLASTIC, SOP-8, Fixed Positive Single Output LDO Regulator 光电二极管 输出元件 调节器 |
文件: | 总16页 (文件大小:184K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
500mA, Low Voltage,
Very Low Dropout
Linear Regulator
FEATURES
DESCRIPTION
The LT®3021 is a very low dropout voltage (VLDO™) lin-
ear regulator that operates from input supplies down to
0.9V. This device supplies 500mA of output current with
a typical dropout voltage of 160mV. The LT3021 is ideal
for low input voltage to low output voltage applications,
providing comparable electrical efficiency to that of a
switching regulator.
n
V Range: 0.9V to 10V
IN
n
Dropout Voltage: 160mV Typical
n
Output Current: 500mA
Adjustable Output (V
n
= V
= 200mV)
REF
OUT(MIN)
n
n
Fixed Output Voltages: 1.2V, 1.5V, 1.8V
Stable with Low ESR, Ceramic Output Capacitors
(3.3μF Minimum)
n
n
n
n
n
n
n
n
0.2% Load Regulation from 0mA to 500mA
Quiescent Current: 120μA (Typ)
3μA Typical Quiescent Current in Shutdown
Current Limit Protection
The LT3021 regulator optimizes stability and transient
responsewithlowESR,ceramicoutputcapacitorsassmall
as 3.3μF. Other LT3021 features include 0.05% typical line
regulation and 0.2% typical load regulation. In shutdown,
quiescent current typically drops to 3μA.
Reverse-Battery Protection
No Reverse Current
Internal protection circuitry includes reverse-battery pro-
tection, current limiting, thermal limiting with hysteresis,
and reverse-current protection. The LT3021 is available as
an adjustable output device with an output range down to
the 200mV reference. Three fixed output voltages, 1.2V,
1.5V and 1.8V, are also available.
Thermal Limiting with Hysteresis
16-Pin DFN (5mm × 5mm) and 8-Lead
SO Packages
APPLICATIONS
n
Low Current Regulators
The LT3021 regulator is available in the low profile
(0.75mm) 16-pin (5mm × 5mm) DFN package with ex-
posed pad and the 8-lead SO package.
L, LT, LTC and LTM 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
Battery-Powered Systems
n
Cellular Phones
n
Pagers
n
Wireless Modems
TYPICAL APPLICATION
Minimum Input Voltage
1.1
I
= 500mA
L
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.8V to 1.5V, 500mA VLDO Regulator
V
OUT
V
IN
IN
OUT
LT3021-1.5
1.5V
1.8V
500mA
3.3μF
3.3μF
SHDN SENSE
GND
3021 TA01
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
3021 TA02
3021fc
1
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
(Note 1)
ABSOLUTE MAXIMUM RATINGS
Operating Junction Temperature Range (E, I Grade)
(Notes 2, 3)............................................–40°C to 125°C
Storage Temperature Range
DH .....................................................–65°C to 125°C
S8......................................................–65°C to 150°C
Lead Temperature (Soldering, 10 sec, S8)............ 300°C
IN Pin Voltage ........................................................ 10V
OUT Pin Voltage...................................................... 10V
Input-to-Output Differential Voltage........................ 10V
ADJ/SENSE Pin Voltage ....................................... 10V
SHDN Pin Voltage ................................................. 10V
Output Short-Circut Duration ......................... Indefinite
PIN CONFIGURATION
TOP VIEW
TOP VIEW
NC
NC
1
2
3
4
5
6
7
8
16 NC
15 NC
14 IN
NC
NC
1
2
3
4
5
6
7
8
16 NC
15 NC
14 IN
OUT
OUT
NC
OUT
OUT
NC
13 NC
12 IN
13 NC
12 IN
17
17
NC
11 NC
10 PGND
NC
11 NC
10 PGND
ADJ
AGND
SENSE
AGND
9
SHDN
9
SHDN
LT3021-ADJ
LT3021-FIXED
DH PACKAGE
DH PACKAGE
16-LEAD (5mm × 5mm) PLASTIC DFN
16-LEAD (5mm × 5mm) PLASTIC DFN
T
= 125°C, θ = 35°C/ W*, θ = 3°C/W**
T
= 125°C, θ = 35°C/ W*, θ = 3°C/W**
JMAX
JA
JC
JMAX JA JC
EXPOSED PAD IS GND (PIN 17) CONNECT TO PINS 8, 10
EXPOSED PAD MUST BE SOLDERED TO THE PCB
*SEE THE APPLICATIONS INFORMATION SECTION
**MEASURED JUNCTION TO PIN 17
EXPOSED PAD IS GND (PIN 17) CONNECT TO PINS 8, 10
EXPOSED PAD MUST BE SOLDERED TO THE PCB
*SEE THE APPLICATIONS INFORMATION SECTION
**MEASURED JUNCTION TO PIN 17
TOP VIEW
TOP VIEW
NC
OUT
1
2
3
4
8
7
6
5
IN
NC
OUT
1
2
3
4
8
7
6
5
IN
NC
NC
SENSE
AGND
PGND
SHDN
ADJ
PGND
SHDN
AGND
LT3021-FIXED
LT3021-ADJ
S8 PACKAGE
S8 PACKAGE
8-LEAD PLASTIC SO
8-LEAD PLASTIC SO
T
= 150°C, θ = 125°C/ W*, θ = 40°C/W**
T
= 150°C, θ = 125°C/ W*, θ = 40°C/W**
JA JC
JMAX
JA JC
JMAX
*SEE THE APPLICATIONS INFORMATION SECTION
**MEASURED JUNCTION TO PIN 6
*SEE THE APPLICATIONS INFORMATION SECTION
**MEASURED JUNCTION TO PIN 6
3021fc
2
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
ORDER INFORMAITON
LEAD FREE FINISH
LT3021EDH#PBF
LT3021EDH-1.2#PBF
LT3021EDH-1.5#PBF
LT3021EDH-1.8#PBF
LT3021ES8#PBF
LT3021ES8-1.2#PBF
LT3021ES8-1.5#PBF
LT3021ES8-1.8#PBF
LT3021IS8-1.8#PBF
LEAD BASED FINISH
LT3021EDH
TAPE AND REEL
PART MARKING*
3021
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–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
–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
LT3021EDH#TRPBF
LT3021EDH-1.2#TRPBF
LT3021EDH-1.5#TRPBF
LT3021EDH-1.8#TRPBF
LT3021ES8#TRPBF
LT3021ES8-1.2#TRPBF
LT3021ES8-1.5#TRPBF
LT3021ES8-1.8#TRPBF
LT3021IS8-1.8#TRPBF
TAPE AND REEL
16-Lead (5mm × 5mm) Plastic DFN
16-Lead (5mm × 5mm) Plastic DFN
16-Lead (5mm × 5mm) Plastic DFN
16-Lead (5mm × 5mm) Plastic DFN
8-Lead Plastic SO
302112
302115
302118
3021
302112
302115
302118
302118
PART MARKING*
3021
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
PACKAGE DESCRIPTION
16-Lead (5mm × 5mm) Plastic DFN
16-Lead (5mm × 5mm) Plastic DFN
16-Lead (5mm × 5mm) Plastic DFN
16-Lead (5mm × 5mm) Plastic DFN
8-Lead Plastic SO
LT3021EDH#TR
LT3021EDH-1.2
LT3021EDH-1.2#TR
LT3021EDH-1.5#TR
LT3021EDH-1.8#TR
LT3021ES8#TR
302112
302115
302118
3021
LT3021EDH-1.5
LT3021EDH-1.8
LT3021ES8
LT3021ES8-1.2
LT3021ES8-1.2#TR
LT3021ES8-1.5#TR
LT3021ES8-1.8#TR
LT3021IS8-1.8#TR
302112
302115
302118
302118
8-Lead Plastic SO
LT3021ES8-1.5
8-Lead Plastic SO
LT3021ES8-1.8
8-Lead Plastic SO
LT3021IS8-1.8
8-Lead Plastic SO
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/
3021fc
3
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
(Notes 5,14)
I
I
= 500mA, T > 0°C
0.9
0.9
1.05
1.10
V
V
LOAD
LOAD
J
= 500mA, T < 0°C
J
ADJ Pin Voltage (Notes 4, 5)
V
= 1.5V, I
= 1mA
LOAD
196
193
200
200
204
206
mV
mV
IN
1.15V < V < 10V, 1mA < I
< 500mA
= 1mA
l
l
l
l
IN
LOAD
Regulated Output Voltage
(Note 4)
LT3021-1.2
LT3021-1.5
LT3021-1.8
LT3021
V
IN
= 1.5V, I
1.176
1.157
1.200
1.200
1.224
1.236
V
V
LOAD
1.5V < V < 10V, 1mA < I
< 500mA
< 500mA
< 500mA
IN
LOAD
LOAD
LOAD
V
IN
= 1.8V, I
= 1mA
LOAD
1.470
1.447
1.500
1.500
1.530
1.545
V
V
1.8V < V < 10V, 1mA < I
IN
V
IN
= 2.1V, I
= 1mA
LOAD
1.764
1.737
1.800
1.800
1.836
1.854
V
V
2.1V < V < 10V, 1mA < I
IN
l
l
l
l
Line Regulation (Note 6)
Load Regulation (Note 6)
Dropout Voltage (Notes 7, 12)
ΔV = 1.15V to 10V, I
= 1mA
–1.75
–10.5
–13
0
0
0
0
+1.75
10.5
13
mV
mV
mV
mV
IN
LOAD
LT3021-1.2 ΔV = 1.5V to 10V, I
= 1mA
= 1mA
= 1mA
IN
IN
IN
LOAD
LOAD
LOAD
LT3021-1.5 ΔV = 1.8V to 10V, I
LT3021-1.8 ΔV = 2.1V to 10V, I
–15.8
15.8
LT3021
V
IN
V
IN
V
IN
V
IN
= 1.15V, ΔI
= 1mA to 500mA
LOAD
–2
–6
–7.5
–9
0.4
1
1.5
2
2
6
7.5
9
mV
mV
mV
mV
LT3021-1.2
LT3021-1.5
LT3021-1.8
= 1.5V, ΔI
= 1.8V, ΔI
= 2.1V, ΔI
= 1mA to 500mA
= 1mA to 500mA
= 1mA to 500mA
LOAD
LOAD
LOAD
I
I
= 10mA
= 10mA
45
75
110
mV
mV
LOAD
LOAD
l
I
I
= 500mA
= 500mA
155
190
285
mV
mV
LOAD
LOAD
l
l
GND Pin Current
I
I
I
I
= 0mA
110
920
2.25
6.20
250
μA
μA
mA
mA
LOAD
LOAD
LOAD
LOAD
V
= V
+ 0.4V
OUT(NOMINAL)
= 10mA
= 100mA
= 500mA
IN
(Notes 8, 12)
l
10
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
C
= 4.7μF, I
= 500mA, BW = 10Hz to 100kHz, V
= 1.2V
300
20
μV
RMS
OUT
LOAD
OUT
V
ADJ
= 0.2V, V = 1.2V (Notes 6, 9)
50
nA
IN
l
l
V
= Off to On
= On to Off
0.61
0.61
0.9
V
V
OUT
OUT
V
0.25
l
l
SHDN Pin Current (Note 10)
V
V
= 0V, V = 10V
1
μA
μA
SHDN
SHDN
IN
= 10V, V = 10V
3
3
9.5
IN
Quiescent Current in Shutdown
Ripple Rejection (Note 6)
V
IN
= 6V, V
= 0V
SHDN
9
μA
dB
LT3021
V
LOAD
– V
= 1V, V = 0.5V , f = 120Hz,
P-P RIPPLE
70
IN
OUT
RIP
I
= 500mA
LT3021-1.2
LT3021-1.5
LT3021-1.8
V
LOAD
– V
= 1V, V
= 0.5V , f = 120Hz,
P-P RIPPLE
60
58
56
1.8
1
dB
dB
dB
IN
OUT
RIPPLE
RIPPLE
RIPPLE
I
= 500mA
V
– V
= 500mA
= 1V, V
= 0.5V , f
P-P RIPPLE
= 120Hz,
= 120Hz,
IN
OUT
I
LOAD
V
– V
= 500mA
= 1V, V
= 0.5V , f
P-P RIPPLE
IN
OUT
I
LOAD
Current Limit (Note 12)
V
IN
V
IN
= 10V, V
= 0V
A
mA
OUT
l
= V
+ 0.5V, ΔV
= –5%
550
OUT(NOMINAL)
OUT
Input Reverse Leakage Current
V
IN
= –10V, V
= 0V
OUT
20
μA
Reverse Output Current
(Notes 11, 13)
LT3021
V
V
V
V
= 1.2V, V = 0V
0.5
10
10
10
5
μA
μA
μA
μA
OUT
OUT
OUT
OUT
IN
LT3021-1.2
LT3021-1.5
LT3021-1.8
= 1.2V, V = 0V
15
15
15
IN
= 1.5V, V = 0V
IN
= 1.8V, V = 0V
IN
3021fc
4
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C.
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.
voltage, not the 0.5V output voltage. Specifications for fixed output voltage
devices are referred to the output voltage.
Note 7: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout the
Note 2: The LT3021 regulators are tested and specified under pulse load
output voltage equals: (V – V
).
IN
DROPOUT
conditions such that T ≈ T . The LT3021E regulators are 100% tested
J
A
Note 8: GND pin current is tested with V = V
+ 0.4V and a
IN
OUT(NOMINAL)
at T = 25°C. Performance at –40°C and 125°C is assured by design,
A
current source load. GND pin current will increase in dropout. See GND pin
current curves in the Typical Performance Characteristics section.
characterization and correlation with statistical process controls. The
LT3021I regulators are guaranteed over the full –40ºC to 125ºC operating
junction temperature range.
Note 9: Adjust pin bias current flows out of the ADJ pin.
Note 10: Shutdown pin current flows into the SHDN pin.
Note 11: 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. For fixed voltage devices this includes the current in
the output resistor divider.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
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: 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 voltage range
if operating at maximum output current.
Note 12: The LT3021 is tested and specified for these conditions with an
external resistor divider (20k and 100k) setting V
resistor divider adds 10μA of load current.
to 1.2V. The external
OUT
Note 13: Reverse current is higher for the case of (rated_output) < V
OUT
< V because the no-load recovery circuitry is active in this region and is
IN,
trying to restore the output voltage to its nominal value.
Note 5: Typically the LT3021 supplies 500mA output current with a 1V
input supply. The guranteed minimum input voltage for 500mA output
current is 1.10V.
Note 14: Minimum input voltage is the minimum voltage required by the
control circuit to regulate the output voltage and supply the full 500mA
rated current. This specification is tested at V
= 0.5V. At higher output
OUT
Note 6: The LT3021 is tested and specified for these conditions with an
voltages the minimum input voltage required for regulation will be equal to
the regulated output voltage V plus the dropout voltage.
external resistor divider (20k and 30.1k) setting V
to 0.5V. The external
OUT
OUT
resistor divider adds 10μA of output load current. The line regulation and
load regulation specifications refer to the change in the 0.2V reference
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
Dropout Voltage
Minimum Input Voltage
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
250
225
200
175
150
125
100
75
250
225
200
175
150
125
100
75
I
= 500mA
V
OUT
= 1.2V
L
I
= 500mA
L
T
= 125°C
J
I
I
= 250mA
= 100mA
L
L
T
= 25°C
J
I
= 50mA
I = 10mA
L
L
50
50
25
25
I
= 1mA
L
0
0
–50 –25
0
25
50
75 100 125
0
100
200
300
400
500
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
3021 G16
3021 G01
3021 G02
3021fc
5
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
TYPICAL PERFORMANCE CHARACTERISTICS
ADJ Pin Voltage
ADJ Pin Bias Current
Quiescent Current
206
204
202
200
198
196
194
25
20
15
10
5
250
225
200
175
150
125
100
75
V
V
L
= 6V
IN
OUT
= 1.2V
I
= 0
V
= V
IN
SHDN
50
25
V
= 0V
SHDN
0
0
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3021 G04
3021 G11
3021 G05
Output Voltage
Output Voltage
Output Voltage
1.23
1.22
1.21
1.20
1.19
1.18
1.17
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.83
1.82
1.81
1.80
1.79
1.78
1.77
I
= 1mA
I
= 1mA
LOAD
LOAD
I
= 1mA
LOAD
50
TEMPERATURE (°C)
100 125
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
–50 –25
0
25
75
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
3021 G28
3021 G23
3021 G22
Quiescent Current
Quiescent Current
Quiescent Current
3.0
2.5
2.0
1.5
1.0
0.5
0
3.0
2.5
2.0
1.5
1.0
0.5
0
3.0
2.5
2.0
1.5
1.0
0.5
0
V
I
J
= 1.2V
V
I
J
= 1.5V
V
I
J
= 1.8V
OUT
= 0
OUT
= 0
OUT
= 0
L
L
L
T
= 25°C
T
= 25°C
T
= 25°C
V
= V
IN
V
= V
IN
V
= V
IN
SHDN
SHDN
SHDN
V
= 0V
7
V
= 0V
7
V
= 0V
SHDN
SHDN
SHDN
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
8
9
10
0
1
2
3
4
5
6
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3021 G03
3021 G26
3021 G27
3021fc
6
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
TYPICAL PERFORMANCE CHARACTERISTICS
GND Pin Current
GND Pin Current
GND Pin Current
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
V
T
= 1.2V
V
T
= 1.5V
V
J
= 1.8V
OUT
OUT
J
OUT
J
R
L
= 2.4Ω
L
= 25°C
= 25°C
T
= 25°C
R
L
= 3Ω
8
7
6
5
4
3
2
1
0
L
I
= 500mA
I
= 500mA
R
L
= 3.6Ω
L
I
= 500mA
R
L
= 4.8Ω
L
R
L
= 6Ω
R
L
= 7.2Ω
L
L
I
= 250mA
R
I
= 24Ω
I
= 250mA
R
L
= 36Ω
I
= 250mA
L
L
R
L
= 30Ω
L
L
R
= 120Ω
= 10mA
L
R
= 50mA
= 150Ω
= 10mA
R
= 180Ω
L
= 50mA
I
= 50mA
L
L
I
I
L
I
I
= 10mA
L
R
L
= 12Ω
R
L
= 18Ω
L
L
R
L
= 15Ω
L
I
= 100mA
I
= 100mA
I
= 100mA
R
= 1.5k, I = 1mA
L
R
= 1.8k, I = 1mA
L
L
R
L
= 1.2k, I = 1mA
L
L
0
1
2
3
4
5
6
7
8
9
10
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)
INPUT VOLTAGE (V)
3021 G06
3021 G24
3021 G25
GND Pin Current vs ILOAD
SHDN Pin Threshold
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
10
9
8
7
6
5
4
3
2
1
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
I
= 1mA
V
= 10V
L
SHDN
–50 –25
0
25
50
75 100 125
0
100
200
300
400
500
0
1
2
3
4
5
6
7
8
9
10
TEMPERATURE (°C)
LOAD CURRENT (mA)
SHDN PIN VOLTAGE (V)
3021 G08
3021 G07
3021 G09
SHDN Pin Input Current
Current Limit
Reverse Output Current
5
4
3
2
1
0
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
500
450
400
350
300
250
200
150
100
50
V
= 0V
V
= 10V
V
V
= 0V
OUT
SHDN
IN
OUT
= 1.2V
V
= 10V
IN
V
= 1.7V
IN
0
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
3021 G10
3021 G12
3021 G13
3021fc
7
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
TYPICAL PERFORMANCE CHARACTERISTICS
Load Regulation
Input Ripple Rejection
Input Ripple Rejection
ΔIL = 1mA to 500mA
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
2.5
2.0
1.5
C
= 22μF
= 4.7μF
OUT
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
C
OUT
V
V
= 1.15V
OUT
IN
= 0.5V
V
V
= 1.5V + 50mV
= 0.5V
RIPPLE
10k
V
V
L
= 1.5V + 0.5V RIPPLE AT 120Hz
P-P
IN
OUT
= 500mA
RMS
IN
OUT
*LOAD REGULATION NUMBER REFERS
TO CHANGE IN THE 200mV REFERENCE
VOLTAGE
= 0.5V
I
I
= 500mA
L
10
100
1k
100k
1M
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
FREQUENCY (Hz)
TEMPERATURE (°C)
TEMPERATURE (°C)
3021 G14
3021 G15
3021 G17
No-Load Recovery Threshold
Output Noise Spectral Density
10
1
18
16
14
12
10
8
V
L
C
= 1.2V
OUT
I
= 500mA
= 4.7μF
OUT
0.1
6
4
2
0.01
10
0
100
1k
10k
100k
1M
0
5
10
15
20
FREQUENCY (Hz)
OUTPUT OVERSHOOT (%)
3021 G20
3021 G18
RMS Output Noise vs Load
Current (10Hz to 100kHz)
Transient Response
300
250
200
150
100
50
V
C
= 1.2V
= 4.7μF
OUT
OUT
V
OUT
50mV/DIV
I
OUT
500mA/DIV
3021 G21
50μs/DIV
I
= 50mA TO 500mA
OUT
IN
V
V
C
= 1.5V
0
0.01
0.1
1
10
100
= 1.2V
OUT
OUT
= 22μF
LOAD CURRENT (mA)
3021 G19
3021fc
8
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
PIN FUNCTIONS (DH Package/S8 Package)
OUT(Pins3,4/Pin2):Thesepinssupplypowertotheload.
Use a minimum output capacitor of 3.3μF to prevent oscil-
lations.Applicationswithlargeloadtransientsrequirelarger
output capacitors to limit peak voltage transients. See the
Applications Information section for more information on
output capacitance and reverse output characteristics.
drainlogic,normallyseveralmicroamperes,andtheSHDN
pin current, typically 2.5μA. If unused, connect the SHDN
pin to V . The LT3021 does not function if the SHDN pin
IN
is not connected.
IN (Pins 12, 14/Pin 8): These pins supply power to the
device. The LT3021 requires a bypass capacitor at IN if
it is more than six inches away from the main input filter
capacitor. The output impedance of a battery rises with
frequency, so include a bypass capacitor in battery-pow-
ered circuits. A bypass capacitor in the range of 3.3μF to
10μF suffices. The LT3021 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 LT3021 acts as if a diode is
in series with its input. No reverse current flows into the
LT3021 and no reverse voltage appears at the load. The
device protects itself and the load.
SENSE(Pin7/Pin3, FixedVoltageDeviceOnly):Thispin
is the sense point for the internal resistor divider. It should
be tied directly to the OUT pins for best results.
ADJ (Pin 7/Pin 3): This pin is the inverting terminal to the
error amplifier. Its typical input bias current of 20nA flows
out of the pin (see curve of ADJ Pin Bias Current vs Tem-
perature in the Typical Performance Characteristics). The
ADJ pin reference voltage is 200mV (referred to GND).
AGND (Pin 8/Pin 4): Ground.
PGND (Pins 10, 17/Pin 6): Ground.
EXPOSED PAD (Pin 17, DH16 Package Only): Ground.
Solder Pin 17 to the PCB ground. Connect directly to Pins
8, 10 for best performance.
SHDN (Pin 9/Pin 5): The SHDN pin puts the LT3021 into
a low power state. Pulling the SHDN pin low turns the
output off. Drive the SHDN pin with either logic or an open
collector/drain device with a pull-up resistor. The pull-up
resistor supplies the pull-up current to the open collector/
NC (Pins 1, 2, 5, 6, 11, 13, 15, 16/Pins 1, 7): NoConnect.
No connect pins may be floated, tied to IN or tied to GND.
BLOCK DIAGRAM (DH Package/S8 Package)
IN
(12, 14/8)
R3
THERMAL
SHUTDOWN
SHDN
(9/5)
SHUTDOWN
D1
Q3
–
CURRENT
Q1
ERROR AMP
+
GAIN
200mV
BIAS CURRENT
AND
REFERENCE
GENERATOR
OUT
D2
(3,4/2)
OUT SENSE
(7/3)
212mV
–
NO-LOAD
RECOVERY
Q2
R2
+
ADJ
(7/3)
25k
R1
FIXED
OUT
NOTE:
V
R1
R2
FOR LT3021 ADJUST PIN (7/3) IS CONNECTED TO
THE ADJUST PIN, R1 AND R2 ARE EXTERNAL.
FOR LT3021-1.X PIN (7/3) IS CONNECTED TO THE
OUTPUT SENSE PIN, R1 AND R2 ARE INTERNAL.
1.2V 20k 100k
1.5V 20k 130k
1.8V 20k 160k
GND
(8,10,17/4,6)
3021 BD
3021fc
9
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
APPLICATIONS INFORMATION
0.4mV at V = 200mV. At V
= 1.5V, load regulation is:
The LT3021 is a very low dropout linear regulator capable
of 1V input supply operation. Devices supply 500mA of
output current and dropout voltage is typically 155mV.
Quiescent current is typically 120μA and drops to 3μA in
shutdown. The LT3021 incorporates several protection
features, making it ideal for use in battery-powered sys-
tems. The device protects itself against reverse-input and
reverse-output voltages. In battery backup applications
where the output is held up by a backup battery when the
input is pulled to ground, the LT3021 acts as if a diode is
in series with its output which prevents reverse current
flow. 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 10V without affecting
start-up or normal operation.
ADJ
OUT
(1.5V/200mV) • (0.4mV) = 3mV
Output Capacitance and Transient Response
The LT3021’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 3.3μF with an ESR of 0.2Ω or less to prevent
oscillations.TheLT3021isalowvoltagedevice,andoutput
loadtransientresponseisafunctionofoutputcapacitance.
Larger values of output capacitance decrease the peak
deviations and provide improved transient response for
larger load current changes. For output capacitor values
greater than 22μF a small feedforward capacitor with a
value of 300pF across the upper divider resistor (R2 in
Figure 1) is required. Under extremely low output current
Adjustable Operation
The LT3021’s output voltage range is 0.2V to 9.5V. Figure
1 shows that the output voltage is set by the ratio of two
externalresistors.Thedeviceregulatestheoutputtomain-
tain the ADJ pin voltage at 200mV referenced to ground.
The current in R1 equals 200mV/R1 and the current in R2
is the current in R1 minus the ADJ pin bias current. The
ADJ pin bias current of 20nA flows out of the pin. Use
the formula in Figure 1 to calculate output voltage. An R1
value of 20k sets the resistor divider current to 10μA. Note
that in shutdown the output is turned off and the divider
current is zero. Curves of ADJ Pin Voltage vs Temperature
and ADJ Pin Bias Current vs Temperature appear in the
Typical Performance Characteristics section.
conditions (I
< 30μA) a low frequency small signal
LOAD
oscillation (200Hz/8mV
at 1.2V output) can occur.
P-P
A minimum load of 100μA is recommended to prevent
this instability.
Give extra consideration to the use of ceramic capacitors.
Manufacturers make ceramic capacitors with a variety of
dielectrics, each with a different behavior across tempera-
ture and applied voltage. The most common dielectrics
are Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics
provide high C-V products in a small package at low cost,
but exhibit strong voltage and temperature coefficients.
The X5R and X7R dielectrics yield highly stable character-
isiticsandaremoresuitableforuseastheoutputcapacitor
at fractionally increased cost. The X5R and X7R dielectrics
both exhibit excellent voltage coefficient characteristics.
The X7R type 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.
IN
OUT
ADJ
V
OUT
+
V
LT3021
SHDN
GND
IN
R2
R1
3021 F01
(R2)
R2
R1
V
= 200mV 1 +
– I
ADJ
OUT
ADJ
(
)
V
= 200mV
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.
I
= 20nA AT 25°C
ADJ
OUTPUT RANGE = 0.2V TO 9.5V
Figure 1. Adjustable Operation
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
The resulting voltages produced can cause appreciable
an output current change of 1mA to 500mA is typically
3021fc
10
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
APPLICATIONS INFORMATION
20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
0
X5R
–20
1mV/DIV
–40
–60
Y5V
3021 F04
–80
V
C
LOAD
= 1.3V
= 10F
= 0
1ms/DIV
OUT
OUT
I
–100
0
8
12 14
2
4
6
10
16
Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor
DC BIAS VOLTAGE (V)
3021 F02
To eliminate this problem, the LT3021 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 cur-
rent sink turns on when the output voltage exceeds 6%
of the nominal output voltage. The current sink level is
then proportional to the overdrive above the threshold
up to a maximum of approximately 15mA. Consult the
curve in the Typical Performance Characteristics for the
No-Load Recovery Threshold.
Figure 2. Ceramic Capacitor DC Bias Characteristics
40
20
X5R
0
–20
–40
Y5V
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
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 LT3021 turns the current sink off and shuts
down the bias current/reference generator circuitry.
–100
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
3021 F03
Figure 3. Ceramic Capacitor Temperature Characteristics
amounts of noise. A ceramic capacitor produced Figure
4’s trace in response to light tapping from a pencil. Similar
vibration induced behavior can masquerade as increased
output voltage noise.
Thermal Considerations
No-Load/Light-Load Recovery
The LT3021’s power handling capability is limited by
its maximum rated junction temperature of 125°C. The
power dissipated by the device is comprised of two
components:
Atransientloadstepoccurswhentheoutputcurrentchanges
from its maximum level to zero current or a very small load
current. The output voltage responds by overshooting until
the regulator lowers the amount of current it delivers to the
newlevel.Theregulatorloopresponsetimeandtheamount
ofoutputcapacitancecontroltheamountofovershoot.Once
the regulator has decreased its output current, the current
1. Outputcurrentmultipliedbytheinput-to-outputvoltage
differential: (I )(V – V ) and
OUT
IN
OUT
2. GND pin current multiplied by the input voltage:
(I )(V ).
provided by the resistor divider (which sets V ) is the
OUT
GND
IN
only current 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 microamperes of divider current and a
few microfarads of output capacitance.
GNDpincurrentisfoundbyexaminingtheGNDpincurrent
curves in the Typical Performance Characteristics. Power
dissipation is equal to the sum of the two components
listed above.
3021fc
11
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
APPLICATIONS INFORMATION
The LT3021 regulator has internal thermal limiting (with
hysteresis)designedtoprotectthedeviceduringoverload
conditions. For normal continuous conditions, do not ex-
ceed the maximum junction temperature rating of 125°C.
Carefully consider all sources of thermal resistance from
junction to ambient including other heat sources mounted
in proximity to the LT3021.
Calculating Junction Temperature
Example: Given an output voltage of 1.2V, an input voltage
range of 1.8V 10%, an output current range of 1mA to
500mA, and a maximum ambient temperature of 70°C,
what will the maximum junction temperature be for an
application using the DH package?
The power dissipated by the device is equal to:
The underside of the LT3021 DH package has exposed
2
I
(V
– V ) + I (V
)
metal (14mm ) from the lead frame to where the die is
OUT(MAX) IN(MAX)
OUT
GND IN(MAX)
attached. This allows heat to directly transfer from the
die junction to the printed circuit board metal to control
maximumoperatingjunctiontemperature.Thedual-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 LT3021 also assist in spreading heat
to the PCB.
where
I
= 500mA
= 1.98V
OUT(MAX)
V
IN(MAX)
I
at (I = 500mA, V = 1.98V) = 10mA
OUT IN
GND
so
P = 500mA(1.98V – 1.2V) + 10mA(1.98V) = 0.41W
The LT3021 S8 package has Pin 4 fused with the lead
frame. This also allows heat to transfer from the die to the
printedcircuitboardmetal, thereforereducingthethermal
resistance. Copper board stiffeners and plated through-
holes can also be used to spread the heat generated by
power devices.
Thethermalresistanceisintherangeof35°C/Wto70°C/W
dependingonthecopperarea.Sothejunctiontemperature
rise above ambient is approximately equal to:
0.41W(52.5°C/W) = 21.5°C
The maximum junction temperature equals the maximum
junctiontemperatureriseaboveambientplusthemaximum
ambient temperature or:
The following tables list thermal resistance for several
different board sizes and copper areas for two different
packages. Measurements were taken in still air on 3/32”
FR-4 board with one ounce copper.
T
= 21.5°C + 70°C = 91.5°C
JMAX
Protection Features
Table 1. Measured Thermal Resistance For DH Package
COPPER AREA
THERMAL RESISTANCE
The LT3021 incorporates several protection features
that make it ideal for use in battery-powered circuits.
In addition to the normal protection features associated
with monolithic regulators, such as current limiting and
thermal limiting, the device also protects against reverse-
input voltages, reverse-output voltages and reverse out-
put-to-input voltages.
TOPSIDE*
BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT)
2
2
2
2
2
2
2
2
2
2
2
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
30°C/W
35°C/W
50°C/W
55°C/W
65°C/W
2
900mm
2
225mm
2
100mm
2
50mm
Current limit protection and thermal overload protection
protect the device against current overload conditions at
the output of the device. For normal operation, do not
exceed a junction temperature of 125°C.
Table 2. Measured Thermal Resistance For S8 Package
COPPER AREA THERMAL RESISTANCE
TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT)
2
2
2
2
2
2
2
2
2
2
2
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
2500mm
70°C/W
70°C/W
78°C/W
84°C/W
96°C/W
2
The IN pins of the device withstand reverse voltages of
10V. The LT3021 limits current flow to less than 1μA and
no negative voltage appears at OUT. The device protects
both itself and the load against batteries that are plugged
1000mm
2
225mm
100mm
2
2
50mm
in backwards.
*Device is mounted on topside.
3021fc
12
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
APPLICATIONS INFORMATION
The LT3021 incurs no damage if OUT is pulled below
ground. If IN is left open circuit 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 LT3021 protects itself by thermal limiting. In this
case, grounding SHDN turns off the LT3021 and stops
OUT from sourcing current.
If the LT3021 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 LT3021 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.
Input Capacitance and Stability
The LT3021 is designed to be stable with a minimum
capacitance of 3.3μF placed at the IN pin. Ceramic capaci-
tors with very low ESR may be used. However, in cases
where a long wire is used to connect a power supply to
the input of the LT3021 (and also from the ground of the
LT3021backtothepowersupplyground),useoflowvalue
input capacitors combined with an output load current of
20mA or greater may result in an unstable application.
This is due to the inductance of the wire forming an LC
tank circuit with the input capacitor and not a result of the
LT3021 being unstable.
The LT3021 incurs no damage if the ADJ pin is pulled
above or below ground by 10V. If IN is left open circuit or
grounded and ADJ is pulled above ground, ADJ acts like a
25k resistor in series with a 1V clamp (one Schottky diode
in series with one diode). ADJ acts like a 25k resistor in
series with a Schottky diode if pulled below ground. If IN
is powered by a voltage source and ADJ is pulled below its
referencevoltage,theLT3021attemptstosourceitscurrent
The self-inductance, or isolated inductance, of a wire is
directly proportional to its length. However, the diameter
of a wire does not have a major influence on its self-in-
ductance. For example, the self inductance of a 2-AWG
isolated wire with a diameter of 0.26 in. is about half the
inductance of a 30-AWG wire with a diameter of 0.01 in.
One foot of 30-AWG wire has 465nH of self inductance.
limit capability at OUT. The output voltage increases to V
IN
– V
with V
set by whatever load current
DROPOUT
DROPOUT
the LT3021 supports. This condition can potentially dam-
age external circuitry powered by the LT3021 if the output
voltage increases to an unregulated high voltage. If IN is
powered by a voltage source and ADJ is pulled above its
referencevoltage,twosituationscanoccur.IfADJispulled
slightly above its reference voltage, the LT3021 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,
thenoloadrecoverycircuitryturnsonandattemptstosink
current. OUT is actively pulled low and the output voltage
clampsataSchottkydiodeaboveground. Pleasenotethat
thebehaviordescribedaboveappliestotheLT3021only. If
a resistor divider is connected under the same conditions,
there will be additional V/R current.
The overall self-inductance of a wire can be reduced in
two ways. One is to divide the current flowing towards the
LT3021 between two parallel conductors and flows in the
same direction in each. In this case, the farther the wires
are placed apart from each other, the more inductance
will be reduced, up to a 50% reduction when placed a few
inches apart. Splitting the wires basically connects two
equal inductors in parallel. However, when placed in close
proximity from each other, mutual inductance is added to
the overall self inductance of the wires. The most effective
way to reduce overall inductance is to place the forward
and return-current conductors (the wire for the input and
the wire for ground) in very close proximity. Two 30-AWG
wires separated by 0.02 in. reduce the overall self-induc-
tance to about one-fifth of a single isolated 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.
3021fc
13
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
APPLICATIONS INFORMATION
If the LT3021 is powered by a battery mounted in close
proximityonthesamecircuitboard,a3.3μFinputcapacitor
issufficientforstability.However,iftheLT3021ispowered
by a distant supply, use a larger value input capacitor fol-
lowingtheguidelineofroughly1μF(inadditiontothe3.3μF
minimum) per 8 inches of wire length. As power supply
output impedance may vary, the minimum input capaci-
tance needed to stabilize the application may also vary.
Extracapacitancemayalsobeplaceddirectlyontheoutput
of the power supply; however, this will require an order of
magnitude more capacitance as opposed to placing extra
capacitanceincloseproximitytotheLT3021.Furthermore,
series resistance may be placed between the supply and
the input of the LT3021 to stabilize the application; as little
as 0.1Ω to 0.5Ω will suffice.
PACKAGE DESCRIPTION
DH Package
16-Lead Plastic DFN (5mm × 5mm)
(Reference LTC DWG # 05-08-1709)
R = 0.115
TYP
0.40 0.05
5.00 0.10
9
16
R = 0.20
TYP
0.70 0.05
5.50 0.05
4.10 0.05
3.45 0.05
(2 SIDES)
3.45 0.10
(2 SIDES)
5.00 0.10
PACKAGE
OUTLINE
PIN 1
PIN 1
TOP MARK
(SEE NOTE 6)
NOTCH
(DH16) DFN 0204
8
1
0.25 0.05
0.50 BSC
0.75 0.05
0.200 REF
0.25 0.05
0.50 BSC
4.10 0.10
(2 SIDES)
4.10 0.05
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJJD-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
3021fc
14
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 .005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 .005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 .005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
3021fc
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.
15
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1121/LT1121HV 150mA, Micropower LDOs
V
SD
: 4.2V to 30V/36V, V : 3.75V to 30V, V = 0.42V, I = 30μA,
OUT DO Q
= 16μA, Reverse-Battery Protection, SOT-223, S8, Z Packages
IN
I
LT1129
LT1761
700mA, Micropower LDO
V : 4.2V to 30V, V : 3.75V to 30V, V = 0.4V, I = 50μA, I = 16μA,
IN OUT DO Q SD
DD, SOT-223, S8, TO220-5, TSSOP20 Packages
100mA, Low Noise Micropower LDO
V : 1.8V to 20V, V : 1.22V to 20V, V = 0.3V, I = 20μA, I < 1μA,
IN OUT DO Q SD
Low Noise: < 20μV
ThinSOT Package
, Stable with 1μF Ceramic Capacitor,
RMSP-P
LT1762
150mA, Low Noise Micropower LDO
500mA, Low Noise Micropower LDO
3A, Low Noise, Fast Transient Response LDOs
V : 1.8V to 20V, V : 1.22V to 20V, V = 0.3V, I = 25μA, I < 1μA,
IN OUT DO Q SD
Low Noise: <20μV
, MS8 Package
RMSP-P
LT1763
V : 1.8V to 20V, V : 1.22V to 20V, V = 0.3V, I = 30μA, I < 1μA,
IN OUT DO Q SD
Low Noise: < 20μV
, S8 Package
RMSP-P
LT1764/LT1764A
V : 2.7V to 20V, V : 1.21V to 20V, V = 0.34V, I = 1mA, I < 1μA,
IN OUT DO Q SD
Low Noise: <40μV
, “A” Version Stable with Ceramic Capacitors,
RMSP-P
DD, TO220-5 Packages
LTC1844
150mA, Low Noise, Micropower VLDO
300mA, Low Noise Micropower LDO
V
SD
: 1.6V to 6.5V, V
= 1.25V, V = 0.09V, I = 35μA,
RMS
IN
OUT(MIN) DO Q
I
< 1μA, Low Noise: < 30μV
, ThinSOT Package
LT1962
V : 1.8V to 20V, V : 1.22V to 20V, V = 0.27V, I = 30μA, I < 1μA,
IN OUT DO Q SD
Low Noise: < 20μV
, MS8 Package
RMSP-P
LT1963/LT1963A
1.5A, Low Noise, Fast Transient Response LDOs
V : 2.1V to 20V, V : 1.21V to 20V, V = 0.34V, I = 1mA, I < 1μA,
IN OUT DO Q SD
Low Noise: < 40μV
, “A” Version Stable with Ceramic Capacitors,
RMSP-P
DD, TO220-5, SOT223, S8 Packages
LT3010
LT3020
50mA, High Voltage, Micropower LDO
100mA, Low Voltage LDO
V : 3V to 80V, V : 1.275V to 60V, V = 0.3V, I = 30μA, I < 1μA,
IN OUT DO Q SD
RMSP-P
Exposed MS8 Package
Low Noise: <100μV
, Stable with 1μF Output Capacitor,
V
: 0.9V to 10V, V : 0.2V to 5V (min), V = 0.15V, I = 120μA,
IN
OUT
DO
Q
Noise: <250μV
, Stable with 2.2μF Ceramic Capacitors,
RMSP-P
DFN-8, MS8 Packages
V : 0.9V to 5.5V, V : 0.4V to 3.6V (min), V = 0.05V, I = 54μA,
IN
LTC3025
LTC3026
300mA, Low Voltage Micropower LDO
1.5A, Low Input Voltage VLDO Regulator
OUT
DO
Q
Stable with 1μF Ceramic Capacitors, DFN-6 Package
V
V
: 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V),
IN
= 0.1V, I = 950μA, Stable with 10μF Ceramic Capacitors,
DO
Q
10-Lead MSOP and DFN-10 Packages
LT3150
Low V , Fast Transient Response, VLDO Controller
V
IN
DS(ON)
: 1.1V to 10V, V : 1.21V to 10V, V = Set by External MOSFET
IN
OUT
DO
R
, 1.4MHz Boost Converter Generates Gate Drive, SSOP16 Package
3021fc
LT 0608 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
© LINEAR TECHNOLOGY CORPORATION 2005
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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