LT3021ES8-1.2 [Linear]
500mA, Low Voltage, Very Low Dropout Linear Regulator; 500mA,低压电压,非常低压差线性稳压器型号: | LT3021ES8-1.2 |
厂家: | Linear |
描述: | 500mA, Low Voltage, Very Low Dropout Linear Regulator |
文件: | 总16页 (文件大小:236K) |
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
U
DESCRIPTIO
FEATURES
The LT®3021 is a very low dropout voltage (VLDOTM) linear
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.
■
VIN Range: 0.9V to 10V
■
Dropout Voltage: 160mV Typical
■
Output Current: 500mA
■
Adjustable Output (VREF = VOUT(MIN) = 200mV)
■
Fixed Output Voltages: 1.2V, 1.5V, 1.8V
■
Stable with Low ESR, Ceramic Output Capacitors
(3.3µF Minimum)
■
0.2% Load Regulation from 0mA to 500mA
The LT3021 regulator optimizes stability and transient
response with low ESR, ceramic output capacitors as
small 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.
■
Quiescent Current: 120µA (Typ)
■
3µA Typical Quiescent Current in Shutdown
■
Current Limit Protection
■
Reverse-Battery Protection
■
No Reverse Current
■
Internal protection circuitry includes reverse-battery pro-
tection, current limiting, thermal limiting with hysteresis,
andreverse-currentprotection. TheLT3021isavailableas
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
U
APPLICATIO S
■
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.
, LTC and LT 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.
■
Battery-Powered Systems
■
Cellular Phones
■
Pagers
■
Wireless Modems
U
TYPICAL APPLICATIO
Minimum Input Voltage
1.8V to 1.5V, 500mA VLDO Regulator
1.1
I
L
= 500mA
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
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
3021fa
1
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
W W
U W
ABSOLUTE AXI U RATI GS
(Note 1)
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
Operating Junction Temperature Range
(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).................. 300°C
U W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
ORDER PART
NUMBER
DH PART
MARKING
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
3021
LT3021EDH
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
ORDER PART
NUMBER
DH PART
MARKING
9
SHDN
9
SHDN
LT3021-ADJ
DH PACKAGE
16-LEAD (5mm × 5mm) PLASTIC DFN
LT3021-FIXED
DH PACKAGE
16-LEAD (5mm × 5mm) PLASTIC DFN
LT3021EDH-1.2
LT3021EDH-1.5
LT3021EDH-1.8
302112
302115
302118
TJMAX = 125°C, θJA = 35°C/ W*, θJC = 3°C/ W**
EXPOSED PAD IS GND (PIN 17) CONNECT TO PINS 8, 10 EXPOSED PAD IS GND (PIN 17) CONNECT TO PINS 8, 10
*SEE THE APPLICATIONS INFORMATION SECTION
**MEASURED JUNCTION TO PIN 17
TJMAX = 125°C, θJA = 35°C/ W*, θJC = 3°C/ W**
*SEE THE APPLICATIONS INFORMATION SECTION
**MEASURED JUNCTION TO PIN 17
ORDER PART
NUMBER
S8 PART
TOP VIEW
TOP VIEW
MARKING
NC
OUT
1
2
3
4
8
7
6
5
IN
NC
OUT
1
2
3
4
8
7
6
5
IN
3021
LT3021ES8
NC
NC
ADJ
PGND
SHDN
SENSE
AGND
PGND
SHDN
AGND
ORDER PART
NUMBER
S8 PART
MARKING
LT3021-ADJ
LT3021-FIXED
S8 PACKAGE
S8 PACKAGE
8-LEAD PLASTIC SO
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 125°C/ W*, θJC = 40°C/ W**
*SEE THE APPLICATIONS INFORMATION SECTION
**MEASURED JUNCTION TO PIN 6
TJMAX = 150°C, θJA = 125°C/ W*, θJC = 40°C/ W**
*SEE THE APPLICATIONS INFORMATION SECTION
**MEASURED JUNCTION TO PIN 6
LT3021ES8-1.2
LT3021ES8-1.5
LT3021ES8-1.8
302112
302115
302118
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult factory for parts specified with wider operating temperature ranges.
3021fa
2
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25°C.
J
PARAMETER
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
●
●
●
●
IN
LOAD
Regulated Output Voltage
(Note 4)
LT3021-1.2
LT3021-1.5
LT3021-1.8
V
IN
= 1.5V, I
= 1mA
LOAD
1.176
1.157
1.200
1.200
1.224
1.236
V
V
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
Line Regulation (Note 6)
Load Regulation (Note 6)
Dropout Voltage (Notes 7, 12)
LT3021
∆V = 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
LT3021-1.5
LT3021-1.8
∆V = 1.5V to 10V, I
= 1mA
= 1mA
= 1mA
IN
LOAD
LOAD
LOAD
∆V = 1.8V to 10V, I
IN
∆V = 2.1V to 10V, I
–15.8
15.8
IN
LT3021
V
IN
V
IN
V
IN
V
IN
= 1.15V, ∆I
= 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, ∆I
= 1.8V, ∆I
= 2.1V, ∆I
= 1mA to 500mA
= 1mA to 500mA
= 1mA to 500mA
LOAD
LOAD
LOAD
I
I
= 10mA
= 10mA
45
75
110
mV
mV
LOAD
LOAD
●
I
I
= 500mA
= 500mA
155
190
285
mV
mV
LOAD
LOAD
●
●
GND Pin Current
I
I
I
I
= 0mA
110
920
2.25
6.20
250
µA
µA
mA
mA
LOAD
LOAD
LOAD
LOAD
V
IN
= V
+ 0.4V
= 10mA
= 100mA
= 500mA
OUT(NOMINAL)
(Notes 8, 12)
●
10
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
C
V
= 4.7µF, I
= 500mA, BW = 10Hz to 100kHz, V
= 1.2V
300
20
µV
RMS
OUT
ADJ
LOAD
OUT
= 0.2V, V = 1.2V (Notes 6, 9)
50
nA
IN
V
OUT
V
OUT
= Off to On
= On to Off
●
●
0.61
0.61
0.9
V
V
0.25
SHDN Pin Current (Note 10)
V
V
= 0V, V = 10V
●
●
±1
µA
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
9
SHDN
LT3021
V
IN
– V
= 1V, V = 0.5V , f = 120Hz,
P-P RIPPLE
70
dB
OUT
RIP
I
= 500mA
LOAD
LT3021-1.2
LT3021-1.5
LT3021-1.8
V
– V
= 500mA
= 1V, V
= 0.5V , f = 120Hz,
P-P RIPPLE
60
58
56
dB
dB
dB
IN
OUT
RIPPLE
RIPPLE
RIPPLE
I
LOAD
V
IN
– V
= 500mA
= 1V, V
= 0.5V , f
P-P RIPPLE
= 120Hz,
= 120Hz,
OUT
I
LOAD
V
IN
– V
= 500mA
= 1V, V
= 0.5V , f
P-P RIPPLE
OUT
I
LOAD
3021fa
3
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25°C.
J
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Current Limit (Note 12)
V
V
= 10V, V
= V
= 0V
1.8
A
mA
IN
IN
OUT
OUT(NOMINAL)
+ 0.5V, ∆V
= –5%
●
550
OUT
Input Reverse Leakage Current
V
= –10V, V = 0V
OUT
1
20
µA
IN
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
Note 7: Dropout voltage is the minimum input to output voltage differential
Note 1: Absolute Maximum Ratings are those values beyond which the life
needed to maintain regulation at a specified output current. In dropout the
of a device may be impaired.
output voltage equals: (V – V
).
IN
DROPOUT
Note 2: The LT3021 regulators are tested and specified under pulse load
Note 8: GND pin current is tested with V = V
+ 0.4V and a
OUT(NOMINAL)
conditions such that T ≈ T . The LT3021 is 100% production tested at
IN
J
A
current source load. GND pin current will increase in dropout. See GND
pin current curves in the Typical Performance Characteristics section.
T = 25°C. Performance at –40°C and 125°C is assured by design,
A
characterization and correlation with statistical process controls.
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
to 1.2V. The external
OUT
resistor divider adds 10µA of load current.
Note 13: Reverse current is higher for the case of (rated_output) < V
<
OUT
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.
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 14: Minimum input voltage is the minimum voltage required by the
control circuit to regulate the output voltage and supply the full 500mA
Note 6: The LT3021 is tested and specified for these conditions with an
external resistor divider (20k and 30.1k) setting V
to 0.5V. The external
OUT
rated current. This specification is tested at V
= 0.5V. At higher output
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
voltage, not the 0.5V output voltage. Specifications for fixed output voltage
devices are referred to the output voltage.
voltages the minimum input voltage required for regulation will be equal to
the regulated output voltage V
plus the dropout voltage.
OUT
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Dropout Voltage
Dropout Voltage
Minimum Input Voltage
250
225
200
175
150
125
100
75
250
225
200
175
150
125
100
75
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
V
= 1.2V
I
L
= 500mA
OUT
I
= 500mA
L
T
= 125°C
J
I
I
= 250mA
= 100mA
L
L
T
J
= 25°C
I
= 50mA
I = 10mA
L
L
50
50
25
25
I
= 1mA
L
0
0
0
100
200
300
400
500
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
TEMPERATURE (°C)
3021 G01
3021 G02
3021 G16
3021fa
4
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U W
TYPICAL PERFOR A CE CHARACTERISTICS
ADJ Pin Voltage
ADJ Pin Bias Current
Quiescent Current
206
204
202
200
198
196
194
25
20
15
10
5
250
V
V
I
= 6V
OUT
= 0
IN
= 1.2V
225
200
175
150
125
100
75
L
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
1.53
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
1.23
1.22
1.21
1.20
1.19
1.18
1.17
I
= 1mA
I
= 1mA
I
= 1mA
LOAD
LOAD
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 G23
3021 G22
3021 G28
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
= 1.8V
V
I
J
= 1.2V
V
I
J
= 1.5V
OUT
= 0
OUT
= 0
OUT
= 0
L
L
L
T = 25°C
J
T
= 25°C
T
= 25°C
V
= V
IN
V
SHDN
= V
IN
V
= V
SHDN
SHDN
IN
V
= 0V
7
V
= 0V
7
SHDN
6
V
= 0V
SHDN
6
SHDN
0
1
2
3
4
5
8
9
10
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3021 G03
3021 G27
3021 G26
3021fa
5
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U W
TYPICAL PERFOR A CE CHARACTERISTICS
GND Pin Current
GND Pin Current
GND Pin Current
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
V
J
= 1.5V
V
T
= 1.2V
V
J
= 1.8V
OUT
OUT
J
OUT
T = 25°C
R
L
= 2.4Ω
T = 25°C
L
= 25°C
R
L
= 3Ω
L
I
= 500mA
I
= 500mA
R
L
= 3.6Ω
L
I
= 500mA
R
= 4.8Ω
= 250mA
L
R
L
= 6Ω
= 250mA
L
R
L
= 7.2Ω
L
I
L
I
R
L
= 24Ω
R
L
= 30Ω
L
R
L
= 36Ω
I
= 250mA
L
L
R
= 120Ω
= 10mA
R
I
= 150Ω
L
= 10mA
L
R
I
= 180Ω
I
= 50mA
I
= 50mA
I
= 50mA
L
L
I
L
= 10mA
L
R
L
= 12Ω
= 100mA
R
L
= 18Ω
L
L
R
L
= 15Ω
L
I
I
= 100mA
I
= 100mA
R
= 1.5k, I = 1mA
L
L
R
= 1.8k, I = 1mA
L
R
= 1.2k, I = 1mA
L
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 I
SHDN Pin Threshold
SHDN Pin Input Current
LOAD
10
9
8
7
6
5
4
3
2
1
0
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
V
= 10V
I = 1mA
L
SHDN
0
100
200
300
400
500
–50 –25
0
25
50
75 100 125
0
1
2
3
4
5
6
7
8
9
10
LOAD CURRENT (mA)
TEMPERATURE (°C)
SHDN PIN VOLTAGE (V)
3021 G07
3021 G08
3021 G09
Reverse Output Current
SHDN Pin Input Current
Current Limit
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
5
4
3
2
1
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 G12
3021 G10
3021 G13
3021fa
6
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation
L
Input Ripple Rejection
Input Ripple Rejection
∆I = 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
I
= 1.5V + 0.5V RIPPLE AT 120Hz
P-P
V
V
I
= 1.5V + 50mV
= 0.5V
RIPPLE
10k
IN
OUT
L
IN
OUT
RMS
*LOAD REGULATION NUMBER REFERS
TO CHANGE IN THE 200mV REFERENCE
VOLTAGE
= 0.5V
= 500mA
= 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
Output Noise Spectral Density
No-Load Recovery Threshold
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
0
10
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
50µs/DIV
3021 G21
I
= 50mA TO 500mA
= 1.5V
OUT
IN
V
V
C
0
0.01
0.1
1
10
100
= 1.2V
OUT
OUT
LOAD CURRENT (mA)
= 22µF
3021 G19
3021fa
7
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U
U
U
PI FU CTIO S
(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.
resistor supplies the pull-up current to the open collector/
drainlogic,normallyseveralmicroamperes,andtheSHDN
pin current, typically 2.5µA. If unused, connect the SHDN
pin to VIN. The LT3021 does not function if the SHDN pin
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.Theoutputimpedanceofabatteryriseswithfre-
quency, so include a bypass capacitor in battery-powered
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
reversevoltageappearsattheload.Thedeviceprotectsitself
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 (1, 2) 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
Temperature in the Typical Performance Characteristics).
TheADJpinreferencevoltageis200mV(referredtoGND).
AGND (Pin 8/Pin 4): Ground.
PGND (Pins 10, 17/Pin 6): Ground.
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
EXPOSED PAD (Pin 17, DH16 Package Only): Ground.
Solder Pin 17 to the PCB ground. Connect directly to Pins
5, 8, 10 for best performance.
NC (Pins 1, 2, 5, 6, 11, 15, 16/Pins 1, 7)
W
BLOCK DIAGRA
(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
3021fa
8
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
W U U
APPLICATIO S I FOR ATIO
U
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.
0.4mVatVADJ=200mV. AtVOUT =1.5V, loadregulationis:
(1.5V/200mV) • (0.4mV) = 3mV
Output Capacitance and Transient Response
The LT3021’s design is stable with a wide range of output
capacitors, but is optimized for low ESR ceramic capaci-
tors. The output capacitor’s ESR affects stability, most
notably with small value capacitors. Use a minimum
output capacitor of 3.3µF with an ESR of 0.2Ω or less to
prevent oscillations. The LT3021 is a low voltage device,
and output load transient response is a function of output
capacitance.Largervaluesofoutputcapacitancedecrease
the peak deviations and provide improved transient re-
sponse for larger load current changes. For output capaci-
torvaluesgreaterthan22µFasmallfeedforwardcapacitor
with a value of 300pF across the upper divider resistor (R2
in Figure 1) is required. Under extremely low output
current conditions (ILOAD < 30µA) a low frequency small
signal oscillation (200Hz/8mVP-P at 1.2V output) can
occur. A minimum load of 100µA is recommended to
prevent this instability.
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
external resistors. The device regulates the output to
maintain 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.UsetheformulainFigure1tocalculateoutputvoltage.
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
appearintheTypicalPerformanceCharacteristicssection.
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-
tureandappliedvoltage.Themostcommondielectricsare
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
characterisiticsandaremoresuitableforuseastheoutput
capacitor at fractionally increased cost. The X5R and X7R
dielectrics both exhibit excellent voltage coefficient char-
acteristics. 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
V
= 200mV 1 +
– I
ADJ
OUT
ADJ
(
)
R1
V
= 200mV
I
= 20nA AT 25°C
ADJ
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltageacrossitsterminalsduetomechanicalstress,simi-
lartothewayapiezoelectricaccelerometerormicrophone
works. For a ceramic capacitor, the stress can be induced
by vibrations in the system or thermal transients. The re-
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; (VOUT/200mV). For example, load regulation for
an output current change of 1mA to 500mA is typically
sultingvoltagesproducedcancauseappreciableamounts
3021fa
9
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
W U U
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APPLICATIO S I FOR ATIO
20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
0
X5R
–20
1mV/DIV
–40
–60
Y5V
–80
–100
V
C
LOAD
= 1.3V
= 10µF
= 0
1ms/DIV
3021 F04
OUT
OUT
0
8
12 14
2
4
6
10
16
DC BIAS VOLTAGE (V)
I
3021 F02
Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor
Figure 2. Ceramic Capacitor DC Bias Characteristics
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 current
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.
40
20
X5R
0
–20
–40
Y5V
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
–100
–50 –25
0
25
50
75
100 125
TEMPERATURE (°C)
3021 F03
If external circuitry forces the output above the no load
recoverycircuit’sthreshold, thecurrentsinkturnsoninan
attempt to restore the output voltage to nominal. The
currentsinkremainsonuntiltheexternalcircuitryreleases
the output. However, if the external circuitry pulls the
output voltage above the input voltage, or the input falls
belowtheoutput,theLT3021turnsthecurrentsinkoffand
shuts down the bias current/reference generator circuitry.
Figure 3. Ceramic Capacitor Temperature Characteristics
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.
No-Load/Light-Load Recovery
Thermal Considerations
A transient load step occurs when the output current
changes from its maximum level to zero current or a very
small load current. The output voltage responds by over-
shooting until the regulator lowers the amount of current it
delivers to the new level. The regulator loop response time
andtheamountofoutputcapacitancecontroltheamountof
overshoot. Once the regulator has decreased its output
current, the current provided by the resistor divider (which
sets VOUT) is the 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
easilyextendstomillisecondswithmicroamperesofdivider
current and a few microfarads of output capacitance.
The LT3021’s power handling capability is limited by its
maximumratedjunctiontemperatureof125°C.Thepower
dissipated by the device is comprised of two components:
1. Output current multiplied by the input-to-output volt-
age differential: (IOUT)(VIN – VOUT) and
2. GND pin current multiplied by the input voltage:
(IGND)(VIN).
GND pin current is found by examining the GND pin
currentcurvesintheTypicalPerformanceCharacteristics.
Power dissipation is equal to the sum of the two compo-
nents listed above.
3021fa
10
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
W U U
APPLICATIO S I FOR ATIO
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The LT3021 regulator has internal thermal limiting (with
hysteresis)designedtoprotectthedeviceduringoverload
conditions. For normal continuous conditions, do not
exceedthemaximumjunctiontemperatureratingof125°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:
TheundersideoftheLT3021DHpackagehasexposedmetal
(14mm2) from the lead frame to where the die is attached.
This allows heat to directly transfer from the die junction
to the printed circuit board metal to control maximum
operating junction temperature. The dual-in-line pin ar-
rangement allows metal to extend beyond the ends of the
package on the topside (component side) of a PCB. Con-
nectthismetaltoGNDonthePCB.ThemultipleINandOUT
pinsoftheLT3021alsoassistinspreadingheattothePCB.
IOUT(MAX)(VIN(MAX) – VOUT) + IGND(VIN(MAX)
where
)
IOUT(MAX) = 500mA
VIN(MAX) = 1.98V
IGND at (IOUT = 500mA, VIN = 1.98V) = 10mA
so
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.
P = 500mA(1.98V – 1.2V) + 10mA(1.98V) = 0.41W
The thermal resistance is in the range of 35°C/W to
70°C/W depending on the copper area. So the junction
temperatureriseaboveambientisapproximatelyequalto:
0.41W(52.5°C/W) = 21.5°C
The maximum junction temperature equals the maximum
junction temperature rise above ambient plus the maxi-
mum 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.
TJMAX = 21.5°C + 70°C = 91.5°C
Table 1. Measured Thermal Resistance For DH Package
Protection Features
COPPER AREA
THERMAL RESISTANCE
TOPSIDE*
2500mm2
900mm2
225mm2
100mm2
50mm2
BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT)
The LT3021 incorporates several protection features that
make it ideal for use in battery-powered circuits. In addi-
tion to the normal protection features associated with
monolithic regulators, such as current limiting and ther-
mal limiting, the device also protects against reverse-
input voltages, reverse-output voltages and reverse
output-to-input voltages.
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
30°C/W
35°C/W
50°C/W
55°C/W
65°C/W
Table 2. Measured Thermal Resistance For S8 Package
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.
COPPER AREA
TOPSIDE* BACKSIDE
THERMAL RESISTANCE
BOARD AREA (JUNCTION-TO-AMBIENT)
2500mm2
1000mm2
225mm2
100mm2
50mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
70°C/W
70°C/W
78°C/W
84°C/W
96°C/W
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
*Device is mounted on topside.
in backwards.
3021fa
11
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
W U U
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APPLICATIO S I FOR ATIO
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(butislimitedby)theresistordividerthatsetstheoutput
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.
circuit. In the case where the input is grounded, there is
less than 1µA of reverse output current.
IftheLT3021INpinisforcedbelowtheOUTpinortheOUT
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
LT3021 back to the power supply ground), use of low
value 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
reference voltage, the LT3021 attempts to source its
current limit capability at OUT. The output voltage in-
creases to VIN – VDROPOUT with VDROPOUT set by whatever
load current the LT3021 supports. This condition can
potentially damage 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 reference voltage, two situations can
occur. If ADJ is pulled slightly above its reference voltage,
theLT3021turnsoffthepasstransistor, nooutputcurrent
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 clamps at a Schottky diode above
ground. Please note that the behavior described above
applies to the LT3021 only. If a resistor divider is con-
nected under the same conditions, there will be additional
V/R current.
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-
inductance. 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.
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
3021fa
12
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
W U U
APPLICATIO S I FOR ATIO
U
If the LT3021 is powered by a battery mounted in close
proximity on the same circuit board, a 3.3µF input capaci-
tor is sufficient for stability. However, if the LT3021 is
powered by a distant supply, use a larger value input
capacitor following the guideline of roughly 1µF (in addi-
tion to the 3.3µF minimum) per 8 inches of wire length. As
power supply output impedance may vary, the minimum
input capacitance needed to stabilize the application may
alsovary. Extracapacitancemayalsobeplaceddirectlyon
the output of the power supply; however, this will require
an order of magnitude more capacitance as opposed to
placingextracapacitanceincloseproximitytotheLT3021.
Furthermore, seriesresistancemaybeplacedbetweenthe
supply and the input of the LT3021 to stabilize the appli-
cation; as little as 0.1Ω to 0.5Ω will suffice.
3021fa
13
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U
PACKAGE DESCRIPTIO
DH Package
16-Lead Plastic DFN (5mm × 5mm)
(Reference LTC DWG # 05-08-1709)
0.70 ±0.05
5.50 ±0.05
4.10 ±0.05
3.45 ±0.05
(2 SIDES)
PACKAGE
OUTLINE
0.25 ± 0.05
0.50 BSC
4.10 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
TYP
0.40 ± 0.05
5.00 ±0.10
9
16
R = 0.20
TYP
3.45 ± 0.10
(2 SIDES)
5.00 ±0.10
PIN 1
PIN 1
TOP MARK
NOTCH
(SEE NOTE 6)
(DH16) DFN 0204
8
1
0.25 ± 0.05
0.75 ±0.05
0.200 REF
0.50 BSC
4.10 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
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
TOP AND BOTTOM OF PACKAGE
3021fa
14
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U
PACKAGE DESCRIPTIO
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
3021fa
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
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LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1121/LT1121HV
150mA, Micropower LDOs
V : 4.2V to 30V/36V, V : 3.75V to 30V, V = 0.42V, I = 30µA,
SD
IN
OUT
DO
Q
I
= 16µA, Reverse-Battery Protection, SOT-223, S8, Z Packages
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
RMSP-P
DO
Q
SD
Low Noise: < 20µV
, S8 Package
LT1764/LT1764A
V : 2.7V to 20V, V : 1.21V to 20V, V = 0.34V, I = 1mA, I < 1µA,
IN
OUT
RMSP-P
DO
Q
SD
Low Noise: <40µV
DD, TO220-5 Packages
, “A” Version Stable with Ceramic Capacitors,
LTC1844
150mA, Low Noise, Micropower VLDO
300mA, Low Noise Micropower LDO
V : 1.6V to 6.5V, V
= 1.25V, V = 0.09V, I = 35µA,
OUT(MIN) DO Q
IN
I
< 1µA, Low Noise: < 30µV
, ThinSOT Package
SD
RMS
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
Low Noise: <100µV
, Stable with 1µF Output Capacitor, Exposed
RMSP-P
MS8 Package
V : 0.9V to 10V, V : 0.2V to 5V (min), V = 0.15V, I = 120µA,
IN
OUT
DO
Q
Noise: <250µV
DFN-8, MS8 Packages
, Stable with 2.2µF Ceramic Capacitors,
RMSP-P
LTC3025
LTC3026
300mA, Low Voltage Micropower LDO
1.5A, Low Input Voltage VLDO Regulator
V : 0.9V to 5.5V, V : 0.4V to 3.6V (min), V = 0.05V, I = 54µA,
IN OUT DO Q
Stable with 1µF Ceramic Capacitors, DFN-6 Package
V : 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V),
IN
DO
V
= 0.1V, I = 950µA, Stable with 10µF Ceramic Capacitors, 10-Lead
Q
MSOP and DFN-10 Packages
LT3150
Low V , Fast Transient Response, VLDO Controller V : 1.1V to 10V, V : 1.21V to 10V, V = Set by External MOSFET
IN
IN
R
OUT
DO
, 1.4MHz Boost Converter Generates Gate Drive, SSOP16 Package
DS(ON)
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LT/TP 0705 500 • PRINTED IN USA
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1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
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