LT3020IMS8-1.5#PBF [Linear]
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| 型号： | LT3020IMS8-1.5#PBF |
| 厂家： | 
Linear |
| 描述： | 暂无描述 线性稳压器IC 调节器 电源电路 光电二极管 输出元件 |
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LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
100mA, Low Voltage,
Very Low Dropout
Linear Regulator
U
DESCRIPTIO
FEATURES
The LT®3020 is a very low dropout voltage (VLDOTM) linear
regulator that operates from input supplies down to 0.9V.
This device supplies 100mA of output current with a
typical dropout voltage of 150mV. The LT3020 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
■
Minimum Input Voltage: 0.9V
■
Dropout Voltage: 150mV Typical
Output Current: 100mA
■
■
Adjustable Output (VREF = VOUT(MIN) = 200mV)
■
Fixed Output Voltages: 1.2V, 1.5V, 1.8V
■
Stable with Low ESR, Ceramic Output Capacitors
(2.2µF Minimum)
The LT3020 regulator optimizes stability and transient
response with low ESR, ceramic output capacitors as
small as 2.2µF. Other LT3020 features include 0% typical
line regulation and 0.2% typical load regulation. In shut-
down, quiescent current drops to 3µA.
■
0.2% Load Regulation from 1mA to 100mA
■
Quiescent Current: 120µA (Typ)
■
3µA Typical Quiescent Current in Shutdown
■
Current Limit Protection
■
Reverse-Battery Protection
■
Internal protection circuitry includes reverse-battery pro-
tection, current limiting, thermal limiting with hysteresis,
andreverse-currentprotection. TheLT3020isavailableas
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.
No Reverse Current
■
Thermal Limiting with Hysteresis
■
8-Lead DFN (3mm × 3mm) and MSOP Packages
U
APPLICATIO S
■
Low Current Regulators
■
Battery-Powered Systems
The LT3020 regulator is available in the low profile
(0.75mm) 8-lead (3mm × 3mm) DFN package with Ex-
posed Pad and the 8-lead MSOP package.
■
Cellular Phones
■
Pagers
■
Wireless Modems
, 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.
U
TYPICAL APPLICATIO
Minimum Input Voltage
1.1
I
= 100mA
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, 100mA VLDO Regulator
V
OUT
V
IN
IN
OUT
LT3020-1.5
SHDN
GND
1.5V
1.8V
100mA
2.2µF
2.2µF
3020 TA01
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
3020 TA02
3020fc
1
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
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 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
DD .................................................... –65°C to 125°C
MS8.................................................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U W
U
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
ORDER PART NUMBER
LT3020EDD
LT3020IDD
LT3020EDD-1.2
LT3020EDD-1.5
LT3020EDD-1.8
LT3020IDD-1.2
LT3020IDD-1.5
LT3020IDD-1.8
TOP VIEW
TOP VIEW
OUT
OUT
OUT
GND
1
2
3
4
8
7
6
5
IN
OUT
OUT
ADJ
GND
1
2
3
4
8
7
6
5
IN
IN
IN
9
9
NC
NC
SHDN
SHDN
DD PART MARKING
DD PART MARKING
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
LAEX
LBYH
LBKC
LBKD
LBKF
LBYJ
LBYK
LBYM
TJMAX = 125°C, θJA = 35°C/ W*, θJC = 3°C/ W
EXPOSED PAD IS GND (PIN 9) CONNECT TO PIN 4
*SEE THE APPLICATIONS INFORMATION SECTION
TJMAX = 125°C, θJA = 35°C/ W*, θJC = 3°C/ W
EXPOSED PAD IS GND (PIN 9) CONNECT TO PIN 4
*SEE THE APPLICATIONS INFORMATION SECTION
ORDER PART NUMBER
ORDER PART NUMBER
LT3020EMS8
LT3020IMS8
LT3020EMS8-1.2
LT3020EMS8-1.5
LT3020EMS8-1.8
LT3020IMS8-1.2
LT3020IMS8-1.5
LT3020IMS8-1.8
TOP VIEW
TOP VIEW
OUT
OUT
OUT
GND
1
2
3
4
8 IN
7 IN
6 NC
5 SHDN
OUT
OUT
ADJ
GND
1
2
3
4
8 IN
7 IN
6 NC
5 SHDN
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
MS8 PART MARKING
TJMAX = 150°C, θJA = 125°C/ W, θJC = 40°C/ W
TJMAX = 150°C, θJA = 125°C/ W, θJC = 40°C/ W
SEE THE APPLICATIONS INFORMATION SECTION
SEE THE APPLICATIONS INFORMATION SECTION
LTAGL
LTBYN
LTBKG
LTBKH
LTBKJ
LTBYP
LTBYQ
LTBYR
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 LTC Marketing for parts specified with wider operating temperature ranges.
3020fc
2
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
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 (Note 14)
I
I
= 100mA, T > 0°C
0.9
0.9
1.05
1.10
V
V
LOAD
LOAD
J
= 100mA, 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
< 100mA
●
●
●
●
IN
LOAD
Regulated Output Voltage
(Note 4)
LT3020-1.2
LT3020-1.5
LT3020-1.8
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
< 100mA
< 100mA
< 100mA
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
= 2.1V, I
= 1mA
LOAD
1.764
1.737
1.800
1.800
1.836
1.854
V
V
IN
2.1V < V < 10V, 1mA < I
IN
Line Regulation (Note 6)
Load Regulation (Note 6)
∆V = 1.15V to 10V, I
= 1mA
∆V = 1.5V to 10V, I
●
●
●
●
–1.75
–10.5
–13
0
0
0
0
1.75
10.5
13
mV
mV
mV
mV
IN
LOAD
LT3020-1.2
LT3020-1.5
LT3020-1.8
= 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
V
IN
= 1.15V, ∆I
= 1mA to 100mA
–1
–6
0.4
1
1
6
mV
mV
mV
mV
LOAD
LT3020-1.2
LT3020-1.5
LT3020-1.8
V
= 1.5V, ∆I
= 1.8V, ∆I
= 2.1V, ∆I
= 1mA to 100mA
= 1mA to 100mA
= 1mA to 100mA
IN
IN
IN
LOAD
LOAD
LOAD
V
V
–7.5
–9
1.5
2
7.5
9
Dropout Voltage (Notes 7, 12)
GND Pin Current
I
I
= 10mA
= 10mA
85
115
180
mV
mV
LOAD
LOAD
●
I
I
= 100mA
= 100mA
150
180
285
mV
mV
LOAD
LOAD
●
●
I
I
I
I
= 0mA
= 1mA
= 10mA
= 100mA
120
570
920
2.25
250
µA
µA
µA
LOAD
LOAD
LOAD
LOAD
V
IN
= V
OUT(NOMINAL)
(Notes 8, 12)
●
3.5
mA
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
C
V
= 2.2µF, I
= 100mA, BW = 10Hz to 100kHz, V
= 1.2V (Notes 6, 9)
= 1.2V
245
20
µV
RMS
OUT
ADJ
LOAD
OUT
= 0.2V,
50
nA
RIPPLE
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
dB
dB
SHDN
SHDN
IN
= 10V, V = 10V
3
3
9.5
IN
Quiescent Current in Shutdown
Ripple Rejection (Note 6)
V
IN
V
IN
= 6V, V
= 0V
9
SHDN
– V
= 1V, V
= 0.5V , f
= 120Hz, I
= 100mA
64
60
OUT
RIPPLE
P-P RIPPLE
LOAD
LT3020-1.2 V – V
= 1V, V
= 1V, V
= 1V, V
= 0.5V , f
= 120Hz,
IN
OUT
OUT
OUT
RIPPLE
RIPPLE
RIPPLE
P-P RIPPLE
I
= 100mA
LOAD
LT3020-1.5 V – V
= 0.5V , f
= 120Hz,
= 120Hz,
58
56
dB
dB
IN
P-P RIPPLE
I
= 100mA
LOAD
LT3020-1.8 V – V
= 0.5V , f
P-P RIPPLE
IN
I
= 100mA
LOAD
3020fc
3
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
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
360
310
mA
mA
IN
IN
OUT
OUT(NOMINAL)
+ 0.5V, ∆V
= –5%
●
110
OUT
Input Reverse Leakage Current
V
V
= –10V, V
= 0V
OUT
1
10
µA
IN
Reverse Output Current
(Notes 11, 13)
= 1.2V, V = 0V
3
5
µA
µA
µA
µA
OUT
IN
LT3020-1.2
LT3020-1.5
LT3020-1.8
V
V
V
= 1.2V, V = 0V
10
10
10
15
15
15
OUT
OUT
OUT
IN
= 1.5V, V = 0V
IN
= 1.8V, V = 0V
IN
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 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
output voltage equals: (V – V
).
IN
DROPOUT
Note 2: The LT3020 regulators are tested and specified under pulse load
conditions such that T ≈ T . The LT3020E is 100% production tested at
Note 8: GND pin current is tested with V = V
and a current
OUT(NOMINAL)
IN
J
A
source load. The device is tested while operating in its dropout region.
This condition forces the worst-case GND pin current. GND pin current
decreases at higher input voltages.
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.
T = 25°C. Performance at –40°C and 125°C is assured by design,
A
characterization and correlation with statistical process controls. The
LT3020I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
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 5: Typically the LT3020 supplies 100mA output current with a 1V
input supply. The guaranteed minimum input voltage for 100mA output
current is 1.10V.
Note 12: The LT3020 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
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 100mA
Note 6: The LT3020 is tested and specified for these conditions with an
rated current. This specification is tested at V
= 0.5V. At higher output
OUT
external resistor divider (20k and 30.1k) setting V
to 0.5V. The external
OUT
voltages the minimum input voltage required for regulation will be equal to
the regulated output voltage V plus the dropout voltage.
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.
OUT
3020fc
4
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Dropout Voltage
Dropout Voltage
Quiescent Current
250
225
200
175
150
125
100
75
250
225
200
175
150
125
100
75
250
V
= 1.2V
V
V
L
= 6V
OUT
IN
OUT
= 0
= 1.2V
225
200
175
150
125
100
75
I
= 100mA
L
I
T
J
= 125°C
I
L
= 50mA
= 10mA
V
= V
IN
SHDN
I
L
T
J
= 25°C
50
50
50
I
= 1mA
L
25
25
25
V
SHDN
= 0V
0
0
0
0
10 20 30 40 50 60 70 80 90 100
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
TEMPERATURE (°C)
3020 G01
3020 G02
3020 G03
Output Voltage
Output Voltage
ADJ Pin Voltage
1.830
1.820
1.810
1.800
1.790
1.780
1.770
1.530
1.520
1.510
1.500
1.490
1.480
1.470
206
204
202
200
198
196
194
I
= 1mA
I
= 1mA
I = 1mA
L
L
L
50
TEMPERATURE (°C)
100 125
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
–50 –25
0
25
75
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
3020 G04
3020 G22
3020 G23
Output Voltage
Quiescent Current
GND Pin Current
1.230
1.220
1.210
1.200
1.190
1.180
1.170
1000
900
800
700
600
500
400
300
200
100
0
2500
2250
2000
1750
1500
1250
1000
750
I
= 1mA
V
I
J
= 1.2V
V
J
= 1.2V
OUT
L
OUT
= 0
T
= 25°C
L
T
= 25°C
R
L
= 12Ω
L
I
= 100mA
R
L
= 24Ω
= 50mA
L
I
R
L
= 120Ω
= 10mA
L
I
500
V
V
= V
IN
SHDN
R
= 1.2k, I = 1mA
L
250
L
= 0V
6
SHDN
0
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
0
1
2
3
4
5
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3020 G05
3020 G06
3020 G24
3020fc
5
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Current
GND Pin Current
Quiescent Current
2500
2250
2000
1750
1500
1250
1000
750
1000
900
800
700
600
500
400
300
200
100
0
1000
900
800
700
600
500
400
300
200
100
0
V
T
= 1.5V (LT 3020-1.5)
V
= 1.8V (LT 3020-1.8)
V
= 1.5V (LT 3020-1.5)
OUT
= 25°C
OUT
= 0
OUT
= 0
I
I
J
L
L
T
= 25°C
T
J
= 25°C
J
R
L
= 15Ω
L
I
= 100mA
R
L
= 30Ω
= 50mA
L
I
R
L
= 150Ω
= 10mA
L
R
= 1.5k
L
I
I
L
= 1mA
500
V
V
5
= V
IN
SHDN
V
V
5
= V
IN
SHDN
250
= 0V
SHDN
6
= 0V
SHDN
6
0
4
0
1
2
3
5
6
7
8
9
10
4
0
1
2
3
7
8
9
10
4
0
1
2
3
7
8
9
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
3020 G28
3020 G25
3020 G27
GND Pin Current
GND Pin Current vs I
SHDN Pin Threshold
LOAD
2000
1800
1600
1400
1200
1000
800
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2500
2250
2000
1750
1500
1250
1000
750
V
V
J
= 1.7V
= 1.2V
= 25°C
I = 1mA
L
IN
OUT
V
J
= 1.8V (LT 3020-1.8)
OUT
= 25°C
T
T
R
L
= 18Ω
L
I
= 100mA
R
L
= 36Ω
L
I
= 50mA
R
L
= 180Ω
600
L
R
L
= 1.8k
L
I
= 10mA
I
= 1mA
500
400
250
200
0
0
4
0
10 20 30 40 50 60 70 80 90 100
–50 –25
0
25
TEMPERATURE (°C)
50
75 100 125
0
1
2
3
5
6
7
8
9
10
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
3020 G07
3020 G08
3020 G26
SHDN Pin Input Current
SHDN Pin Input Current (µA)
ADJ Pin Bias Current
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
25
20
15
10
5
T
J
= 25°C
V
SHDN
= 10V
0
0
1
2
3
4
5
6
7
8
9
10
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
SHDN PIN VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
3020 G09
3020 G10
3020 G11
3020fc
6
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Output Current
Current Limit
Input Ripple Rejection
500
450
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
70
V
V
= 0V
V
= 0V
IN
OUT
OUT
= 1.2V
60
50
40
V
= 10V
IN
V
= 1.7V
IN
C
= 10µF
OUT
30
20
10
0
V
V
= 1.5V + 50mV
= 0.5V
RIPPLE
10k
IN
OUT
= 100mA
RMS
C
= 2.2µF
OUT
I
L
0
0
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
10
100
1k
100k
1M
TEMPERATURE (°C)
TEMPERATURE (°C)
FREQUENCY (Hz)
3020 G13
3020 G12
3020 G14
Load Regulation
L
Minimum Input Voltage
∆I = 1mA to 100mA
Input Ripple Rejection
100
90
80
70
60
50
40
30
20
10
0
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.0
0.8
I
= 100mA
L
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
V
V
= 1.15V
OUT
IN
= 0.5V
V
V
L
= 1.5V + 0.5V RIPPLE AT f = 120Hz
OUT
= 100mA
IN
P-P
*LOAD REGULATION NUMBER REFERS
= 0.5V
TO CHANGE IN THE 200mV REFERENCE
VOLTAGE
I
–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)
3020 G15
3020 G16
3020 G17
Transient Response
Output Noise Spectral Density
10
1
V
= 1.2V
OUT
I
= 100mA
L
V
OUT
C
= 2.2µF
OUT
50mV/DIV
I
OUT
100mA/DIV
0.1
50µs/DIV
3020 G21
I
= 10mA TO 100mA
OUT
OUT
V
= 1.5V
0.01
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
3020 G18
3020fc
7
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
U W
TYPICAL PERFOR A CE CHARACTERISTICS
RMS Output Noise vs Load
Current (10Hz to 100kHz)
No-Load Recovery Threshold
300
250
200
150
100
50
18
16
14
12
10
8
V
OUT
C
OUT
= 1.2V
= 2.2µF
6
4
2
0
0
0.01
0.1
1
10
100
0
5
10
15
20
LOAD CURRENT (mA)
OUTPUT OVERSHOOT (%)
3020 G20
3020 G19
U
U
U
PI FU CTIO S
OUT (Pins 1, 2): These pins supply power to the load. Use
aminimumoutputcapacitorof2.2µFtopreventoscillations.
Applications with large load transients require larger out-
put capacitors to limit peak voltage transients. See the
Applications Information section for more information on
output capacitance and reverse output characteristics.
supplies the pull-up current to the open collector/drain
logic, normally several microamperes, and the SHDN pin
current, typically 2.3µA. If unused, connect the SHDN pin
toVIN. TheLT3020doesnotfunctioniftheSHDNpinisnot
connected.
IN (Pins 7, 8): These pins supply power to the device. The
LT3020 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-powered circuits. A
bypasscapacitorintherangeof2.2µFto10µFsuffices.The
LT3020 withstands reverse voltages on the IN pin with
respecttogroundandtheOUTpin.Inthecaseofareversed
input, which occurs if a battery is plugged in backwards,
the LT3020 acts as if a diode is in series with its input. No
reverse current flows into the LT3020 and no reverse volt-
age appears at the load. The device protects itself and the
load.
OUT (Pin 3, Fixed Voltage Device Only): This pin is the
sense point for the internal resistor divider. It should be
tied directly to the other OUT pins (1, 2) for best results.
ADJ (Pin 3, Adjustable Device Only): 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 Perfor-
mance Characteristics). The ADJ pin reference voltage is
200mV (referred to GND).
GND (Pin 4): Ground.
SHDN (Pin 5): The SHDN pin puts the LT3020 into a low
powerstate. PullingtheSHDNpinlowturnstheoutputoff.
Drive the SHDN pin with either logic or an open collector/
drain device with a pull-up resistor. The pull-up resistor
GND (Pin 9, DD8 Package Only): Ground. Solder Pin 9
(the exposed pad) to the PCB. Connect directly to Pin 4 for
best performance.
3020fc
8
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
W
BLOCK DIAGRA
IN
(7, 8)
R3
THERMAL
SHUTDOWN
SHDN
(5)
SHUTDOWN
D1
Q3
–
CURRENT
GAIN
ERROR AMP
+
Q1
200mV
212mV
BIAS CURRENT
AND
REFERENCE
GENERATOR
OUT
D2
(1, 2)
OUT SENSE
(3)
–
NO-LOAD
RECOVERY
Q2
R2
+
25k
ADJ
(3)
R1
FIXED
OUT
NOTE:
V
R1
R2
FOR LT3020 ADJUST PIN 3 IS CONNECTED TO
THE ADJUST PIN, R1 AND R2 ARE EXTERNAL.
FOR LT3020-1.X PIN 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
(4,9)
3020 BD
W U U
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APPLICATIO S I FOR ATIO
The LT3020 is a very low dropout linear regulator capable
of 0.9V input supply operation. Devices supply 100mA of
output current and dropout voltage is typically 150mV.
Quiescent current is typically 120µA and drops to 3µA in
shutdown. The LT3020 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 LT3020 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.
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.
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
IN
OUT
ADJ
V
OUT
+
V
LT3020-ADJ
IN
R2
SHDN
GND
R1
Adjustable Operation
3020 F01
(R2)
R2
The LT3020’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
V
= 200mV 1 +
– I
ADJ
OUT
ADJ
(
)
R1
V
= 200mV
I
= 20nA AT 25°C
ADJ
OUTPUT RANGE = 0.2V TO 9.5V
Figure 1. Adjustable Operation
3020fc
9
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
W U U
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APPLICATIO S I FOR ATIO
an output current change of 1mA to 100mA is typically
0.4mVatVADJ =200mV. AtVOUT =1.5V, loadregulationis:
20
0
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
X5R
(1.5V/200mV) • (0.4mV) = 3mV
–20
–40
Output Capacitance and Transient Response
The LT3020’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 2.2µF with an ESR of 0.3Ω or less to
prevent oscillations. The LT3020 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-
torvaluesgreaterthan20µFasmallfeedforwardcapacitor
with a value of 300pF across the upper divider resistor (R2
in Figure 1) is required.
–60
Y5V
–80
–100
0
8
12 14
2
4
6
10
16
DC BIAS VOLTAGE (V)
3020 F02
Figure 2. Ceramic Capacitor DC Bias Characteristics
40
20
X5R
0
–20
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.
–40
Y5V
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
–100
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
3020 F03
Figure 3. Ceramic Capacitor Temperature Characteristics
1mV/DIV
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-
sultingvoltagesproducedcancauseappreciableamounts
of noise. A ceramic capacitor produced Figure 4’s trace in
V
C
LOAD
= 1.3V
= 10µF
= 0
1ms/DIV
3020 F04
OUT
OUT
I
Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor
3020fc
10
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
W U U
APPLICATIO S I FOR ATIO
U
response to light tapping from a pencil. Similar vibration
induced behavior can masquerade as increased output
voltage noise.
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).
No-Load/Light-Load Recovery
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.
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 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 easily extends to milliseconds
with microamperes of divider current and a few microfar-
ads of output capacitance.
The LT3020 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 LT3020.
TheundersideoftheLT3020DDpackagehasexposedmetal
(4mm2) 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
pinsoftheLT3020alsoassistinspreadingheattothePCB.
To eliminate this problem, the LT3020 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.
The LT3020 MS8 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.
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,theLT3020turnsthecurrentsinkoffand
shuts down the bias current/reference generator circuitry.
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.
Table 1. Measured Thermal Resistance for DD Package
COPPER AREA
THERMAL RESISTANCE
TOPSIDE*
2500mm2
900mm2
225mm2
100mm2
50mm2
BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT)
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
2500mm2
35°C/W
40°C/W
55°C/W
60°C/W
70°C/W
Thermal Considerations
The LT3020’s power handling capability is limited by its
maximumratedjunctiontemperatureof125°C.Thepower
dissipated by the device is comprised of two components:
3020fc
11
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
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APPLICATIO S I FOR ATIO
Table 2. Measured Thermal Resistance for MS8 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
110°C/W
115°C/W
120°C/W
130°C/W
140°C/W
The IN pins of the device withstand reverse voltages of
10V. The LT3020 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
in backwards.
*Device is mounted on topside.
Calculating Junction Temperature
The LT3020 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 LT3020 protects itself by thermal limiting. In this
case, grounding SHDN turns off the LT3020 and stops
OUT from sourcing current.
Example: Given an output voltage of 1.8V, an input voltage
range of 2.25V to 2.75V, an output current range of 1mA
to 100mA, and a maximum ambient temperature of 70°C,
what will the maximum junction temperature be for an
application using the DD package?
The power dissipated by the device is equal to:
IOUT(MAX)(VIN(MAX) – VOUT) + IGND(VIN(MAX)
where
)
IOUT(MAX) = 100mA
VIN(MAX) = 2.75V
IGND at (IOUT = 100mA, VIN = 2.75V) = 3mA
The LT3020 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 LT3020 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 LT3020 supports. This condition can
potentially damage external circuitry powered by the
LT3020 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,
theLT3020turnsoffthepasstransistor, 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
so
P = 100mA(2.75V – 1.8V) + 3mA(2.75V) = 0.103W
The thermal resistance is in the range of 35°C/W to
70°C/W depending on the copper area. So the junction
temperatureriseaboveambientisapproximatelyequalto:
0.103W(52.5°C/W) = 5.4°C
The maximum junction temperature equals the maximum
junction temperature rise above ambient plus the maxi-
mum ambient temperature or:
TJMAX = 70°C + 5.4°C = 75.4°C
Protection Features
The LT3020 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.
3020fc
12
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
W U U
APPLICATIO S I FOR ATIO
U
and the output voltage clamps at a Schottky diode above
ground. Please note that the behavior described above
applies to the LT3020 only. If a resistor divider is con-
nected under the same conditions, there will be additional
V/R current.
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
LT3020 between two parallel conductors. 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 basi-
cally 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. Themosteffectivewaytoreduceoverallinductance
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. re-
duce the overall self-inductance 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.
IftheLT3020INpinisforcedbelowtheOUTpinortheOUT
pin is pulled above the IN pin, input current drops to less
than 10µA typically. This occurs if the LT3020 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.
If the LT3020 is powered by a battery mounted in close
proximity on the same circuit board, a 2.2µF input capaci-
tor is sufficient for stability. However, if the LT3020 is
powered by a distant supply, use a larger value input
capacitor following the guideline of roughly 1µF (in addi-
tion to the 2.2µF 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
placingextracapacitanceincloseproximitytotheLT3020.
Furthermore, seriesresistancemaybeplacedbetweenthe
supply and the input of the LT3020 to stabilize the appli-
cation; as little as 0.1Ω to 0.5Ω will suffice.
Input Capacitance and Stability
The LT3020 is designed to be stable with a minimum
capacitance of 2.2µF 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 LT3020 (and also from the ground of the
LT3020 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 LT3020 being unstable.
The self-inductance, or isolated inductance, of a wire is
directly proportional to its length. However, the diameter
3020fc
13
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
U
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
0.675 ±0.05
3.5 ±0.05
2.15 ±0.05 (2 SIDES)
1.65 ±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
0.38 ± 0.10
TYP
5
8
3.00 ±0.10
(4 SIDES)
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
(DD8) DFN 1203
4
1
0.25 ± 0.05
0.75 ±0.05
0.200 REF
0.50 BSC
2.38 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
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 TOP AND BOTTOM OF PACKAGE
3020fc
14
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
U
PACKAGE DESCRIPTIO
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
3.00 ± 0.102
(.118 ± .004)
0.52
0.65
(.0256)
BSC
0.42 ± 0.038
(.0165 ± .0015)
TYP
(.0205)
REF
(NOTE 3)
8
7 6
5
RECOMMENDED SOLDER PAD LAYOUT
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
4.90 ± 0.152
(.193 ± .006)
DETAIL “A”
0.254
(.010)
0° – 6° TYP
GAUGE PLANE
1
2
3
4
0.53 ± 0.152
(.021 ± .006)
1.10
(.043)
MAX
0.86
(.034)
REF
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
0.127 ± 0.076
(.009 – .015)
(.005 ± .003)
0.65
(.0256)
BSC
TYP
MSOP (MS8) 0204
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
3020fc
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.
15
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
V : 4.2V to 30V/36V, V
LT1121/LT1121HV
150mA, Micropower LDOs
= 3.75V, V = 0.42V, I = 30µA,
OUT(MIN) DO Q
= 16µA, Reverse-Battery Protection, SOT-223, S8, Z Packages
IN
I
SD
LT1129
LT1761
700mA, Micropower LDO
V : 4.2V to 30V, V
DD, SOT-223, S8, TO220-5, TSSOP20 Packages
= 3.75V, V = 0.4V, I = 50µA, I = 16µA,
OUT(MIN) DO Q SD
IN
100mA, Low Noise Micropower LDO
V : 1.8V to 20V, V
= 1.22V, V = 0.3V, I = 20µA, I < 1µA,
DO Q SD
IN
OUT(MIN)
Low Noise: < 20µV
ThinSOT Package
, Stable with 1µF Ceramic Capacitor,
RMS
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, V = 0.3V, I = 25µA, I < 1µA,
OUT(MIN) DO Q SD
IN
Low Noise: <20µV
, MS8 Package
RMS
LT1763
V : 1.8V to 20V, V
= 1.22V, V = 0.3V, I = 30µA, I < 1µA,
OUT(MIN) DO Q SD
IN
Low Noise: < 20µV
, S8 Package
RMS
LT1764/LT1764A
V : 2.7V to 20V, V
= 1.21V, V = 0.34V, I = 1mA, I < 1µA,
OUT(MIN) DO Q SD
IN
Low Noise: <40µV
, “A” Version Stable with Ceramic Capacitors,
RMS
DD, TO220-5 Packages
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, I < 1µA,
OUT(MIN) DO Q SD
IN
Low Noise: < 30µV
, ThinSOT Package
RMS
LT1962
V : 1.8V to 20V, V
= 1.22V, V = 0.27V, I = 30µA, I < 1µA,
OUT(MIN) DO Q SD
IN
Low Noise: < 20µV
, MS8 Package
RMS
LT1963/LT1963A
1.5A, Low Noise, Fast Transient Response LDOs
V : 2.1V to 20V, V
= 1.21V, V = 0.34V, I = 1mA, I < 1µA,
OUT(MIN) DO Q SD
IN
Low Noise: < 40µV
, “A” Version Stable with Ceramic Capacitors,
RMS
DD, TO220-5, SOT223, S8 Packages
LT1964
LT3010
200mA, Low Noise Micropower, Negative LDO
50mA, High Voltage, Micropower LDO
300mA, Low Voltage, Micropower LDO
V : –2.2V to –20V, V
= 1.21V, V = 0.34V, I = 30µA, I = 3µA,
OUT(MIN) DO Q SD
IN
Low Noise: <30µV
, Stable with Ceramic Capacitors,
RMS
ThinSOT Package
V : 3V to 80V, V
= 1.2V, V = 0.3V, I = 30µA, I < 1µA,
DO Q SD
, Stable with 1µF Output Capacitor, Exposed
IN
OUT(MIN)
Low Noise: <100µV
RMS
MS8E Package
LTC3025
LT3150
V : 0.9V to 5.5V, V
1µF Ceramic Capacitors, DFN-6 Package
= 0.4V, V = 0.05V, I = 54µA, Stable with
OUT(MIN) DO Q
IN
Low V , Fast Transient Response, VLDO Controller V : 1.1V to 10V, V = 1.23V, V = Set by External MOSFET
IN
IN
OUT(MIN)
DO
R , 1.4MHz Boost Converter Generates Gate Drive, SSOP16 Package
DS(ON)
3020fc
LT/LT 0905 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
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