LINER LT3021-1.2 500ma, low voltage, very low dropout linear regulator Datasheet

LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
500mA, Low Voltage,
Very Low Dropout
Linear Regulator
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FEATURES
DESCRIPTIO
■
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.
■
■
■
■
■
■
■
■
■
■
■
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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
Quiescent Current: 120µA (Typ)
3µA Typical Quiescent Current in Shutdown
Current Limit Protection
Reverse-Battery Protection
No Reverse Current
Thermal Limiting with Hysteresis
16-Pin DFN (5mm × 5mm) and 8-Lead
SO Packages
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APPLICATIO S
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■
■
■
Low Current Regulators
Battery-Powered Systems
Cellular Phones
Pagers
Wireless Modems
Internal protection circuitry includes reverse-battery protection, 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.
The LT3021 regulator is available in the low profile
(0.75mm) 16-pin (5mm × 5mm) DFN package with exposed 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.
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■
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.
TYPICAL APPLICATIO
Minimum Input Voltage
1.8V to 1.5V, 500mA VLDO Regulator
1.1
VIN
1.8V
IN
3.3µF
OUT
LT3021-1.5
SHDN
3.3µF
SENSE
GND
3021 TA01
VOUT
1.5V
500mA
MINIMUM INPUT VOLTAGE (V)
1.0
IL = 500mA
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
3021 TA02
3021fa
1
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
W W
W
AXI U
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ABSOLUTE
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
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PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
NC
1
16 NC
NC
1
16 NC
NC
2
15 NC
NC
2
15 NC
OUT
3
14 IN
OUT
3
14 IN
OUT
4
13 NC
OUT
4
13 NC
NC
5
12 IN
NC
5
NC
6
11 NC
NC
6
11 NC
ADJ
7
10 PGND
SENSE
7
10 PGND
AGND
8
9
SHDN
AGND
8
9
17
LT3021-ADJ
DH PACKAGE
16-LEAD (5mm × 5mm) PLASTIC DFN
17
SHDN
TJMAX = 125°C, θJA = 35°C/ W*, θJC = 3°C/ W**
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
*SEE THE APPLICATIONS INFORMATION SECTION
**MEASURED JUNCTION TO PIN 17
**MEASURED JUNCTION TO PIN 17
TOP VIEW
NC 1
8
IN
NC 1
8
IN
OUT 2
7
NC
OUT 2
7
NC
ADJ 3
6
PGND
SENSE 3
6
PGND
AGND 4
5
SHDN
AGND 4
5
SHDN
LT3021-ADJ
S8 PACKAGE
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
DH PART
MARKING
LT3021EDH
3021
ORDER PART
NUMBER
DH PART
MARKING
LT3021EDH-1.2
LT3021EDH-1.5
LT3021EDH-1.8
302112
302115
302118
ORDER PART
NUMBER
S8 PART
MARKING
LT3021ES8
3021
ORDER PART
NUMBER
S8 PART
MARKING
LT3021ES8-1.2
LT3021ES8-1.5
LT3021ES8-1.8
302112
302115
302118
12 IN
LT3021-FIXED
DH PACKAGE
16-LEAD (5mm × 5mm) PLASTIC DFN
TOP VIEW
ORDER PART
NUMBER
LT3021-FIXED
S8 PACKAGE
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
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 TJ = 25°C.
PARAMETER
CONDITIONS
Minimum Input Voltage
(Notes 5,14)
ILOAD = 500mA, TJ > 0°C
ILOAD = 500mA, TJ < 0°C
ADJ Pin Voltage (Notes 4, 5)
VIN = 1.5V, ILOAD = 1mA
1.15V < VIN < 10V, 1mA < ILOAD < 500mA
Regulated Output Voltage
(Note 4)
LT3021-1.2
LT3021-1.5
LT3021-1.8
MIN
MAX
UNITS
0.9
0.9
1.05
1.10
V
V
mV
mV
●
196
193
200
200
204
206
VIN = 1.5V, ILOAD = 1mA
1.5V < VIN < 10V, 1mA < ILOAD < 500mA
●
1.176
1.157
1.200
1.200
1.224
1.236
V
V
VIN = 1.8V, ILOAD = 1mA
1.8V < VIN < 10V, 1mA < ILOAD < 500mA
●
1.470
1.447
1.500
1.500
1.530
1.545
V
V
VIN = 2.1V, ILOAD = 1mA
2.1V < VIN < 10V, 1mA < ILOAD < 500mA
●
1.764
1.737
1.800
1.800
1.836
1.854
V
V
●
●
●
●
–1.75
–10.5
–13
–15.8
0
0
0
0
+1.75
10.5
13
15.8
mV
mV
mV
mV
–2
–6
–7.5
–9
0.4
1
1.5
2
2
6
7.5
9
mV
mV
mV
mV
45
75
110
mV
mV
155
190
285
mV
mV
110
920
2.25
6.20
250
µA
µA
mA
mA
Line Regulation (Note 6)
LT3021
LT3021-1.2
LT3021-1.5
LT3021-1.8
∆VIN = 1.15V to 10V, ILOAD = 1mA
∆VIN = 1.5V to 10V, ILOAD = 1mA
∆VIN = 1.8V to 10V, ILOAD = 1mA
∆VIN = 2.1V to 10V, ILOAD = 1mA
Load Regulation (Note 6)
LT3021
LT3021-1.2
LT3021-1.5
LT3021-1.8
VIN = 1.15V, ∆ILOAD = 1mA to 500mA
VIN = 1.5V, ∆ILOAD = 1mA to 500mA
VIN = 1.8V, ∆ILOAD = 1mA to 500mA
VIN = 2.1V, ∆ILOAD = 1mA to 500mA
Dropout Voltage (Notes 7, 12)
ILOAD = 10mA
ILOAD = 10mA
●
ILOAD = 500mA
ILOAD = 500mA
●
●
GND Pin Current
VIN = VOUT(NOMINAL) + 0.4V
(Notes 8, 12)
ILOAD = 0mA
ILOAD = 10mA
ILOAD = 100mA
ILOAD = 500mA
Output Voltage Noise
COUT = 4.7µF, ILOAD = 500mA, BW = 10Hz to 100kHz, VOUT = 1.2V
ADJ Pin Bias Current
VADJ = 0.2V, VIN = 1.2V (Notes 6, 9)
Shutdown Threshold
VOUT = Off to On
VOUT = On to Off
●
●
VSHDN = 0V, VIN = 10V
VSHDN = 10V, VIN = 10V
●
●
SHDN Pin Current (Note 10)
TYP
●
10
µVRMS
300
0.25
20
50
nA
0.61
0.61
0.9
V
V
3
±1
9.5
µA
µA
9
µA
Quiescent Current in Shutdown
VIN = 6V, VSHDN= 0V
3
Ripple Rejection (Note 6)
LT3021
VIN – VOUT = 1V, VRIP = 0.5VP-P, fRIPPLE = 120Hz,
ILOAD = 500mA
70
dB
LT3021-1.2
VIN – VOUT = 1V, VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz,
ILOAD = 500mA
60
dB
LT3021-1.5
VIN – VOUT = 1V, VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz,
ILOAD = 500mA
58
dB
LT3021-1.8
VIN – VOUT = 1V, VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz,
ILOAD = 500mA
56
dB
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 TJ = 25°C.
PARAMETER
CONDITIONS
Current Limit (Note 12)
VIN = 10V, VOUT = 0V
VIN = VOUT(NOMINAL) + 0.5V, ∆VOUT = –5%
MIN
Input Reverse Leakage Current
VIN = –10V, VOUT = 0V
Reverse Output Current
(Notes 11, 13)
LT3021
LT3021-1.2
LT3021-1.5
LT3021-1.8
MAX
UNITS
1.8
●
A
mA
550
VOUT = 1.2V, VIN = 0V
VOUT = 1.2V, VIN = 0V
VOUT = 1.5V, VIN = 0V
VOUT = 1.8V, VIN = 0V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3021 regulators are tested and specified under pulse load
conditions such that TJ ≈ TA. The LT3021 is 100% production tested at
TA = 25°C. Performance at –40°C and 125°C is assured by design,
characterization and correlation with statistical process controls.
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 LT3021 supplies 500mA output current with a 1V
input supply. The guranteed minimum input voltage for 500mA output
current is 1.10V.
Note 6: The LT3021 is tested and specified for these conditions with an
external resistor divider (20k and 30.1k) setting VOUT to 0.5V. The external
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.
TYP
1
20
µA
0.5
10
10
10
5
15
15
15
µA
µA
µA
µA
Note 7: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout the
output voltage equals: (VIN – VDROPOUT).
Note 8: GND pin current is tested with VIN = VOUT(NOMINAL) + 0.4V and a
current source load. GND pin current will increase in dropout. See GND
pin current curves in the Typical Performance Characteristics section.
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 12: The LT3021 is tested and specified for these conditions with an
external resistor divider (20k and 100k) setting VOUT to 1.2V. The external
resistor divider adds 10µA of load current.
Note 13: Reverse current is higher for the case of (rated_output) < VOUT <
VIN, because the no-load recovery circuitry is active in this region and is
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
rated current. This specification is tested at VOUT = 0.5V. At higher output
voltages the minimum input voltage required for regulation will be equal to
the regulated output voltage VOUT plus the dropout voltage.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Dropout Voltage
250
200
175
150
125
TJ = 25°C
100
VOUT = 1.2V
225
TJ = 125°C
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
225
Minimum Input Voltage
1.2
IL = 500mA
200
IL = 250mA
175
150
IL = 100mA
125
100
75
IL = 50mA
50
50
IL = 10mA
25
25
IL = 1mA
75
0
0
100
200
300
400
OUTPUT CURRENT (mA)
500
3021 G01
0
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
IL = 500mA
1.1
MINIMUM INPUT VOLTAGE (V)
Dropout Voltage
250
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
125
3021 G02
0.2
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
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
206
202
200
198
196
250
20
QUIESCENT CURRENT (µA)
ADJ PIN BIAS CURRENT (nA)
204
ADJ PIN VOLTAGE (mV)
Quiescent Current
25
15
10
5
VIN = 6V
225 VOUT = 1.2V
IL = 0
200
175
150
VSHDN = VIN
125
100
75
50
25
194
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
0
–50
125
–25
0
25
50
75
TEMPERATURE (°C)
100
3021 G04
ILOAD = 1mA
ILOAD = 1mA
1.19
1.51
1.50
1.49
1.48
1.18
1.17
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
1.47
–50 –25
3.0
50
25
75
0
TEMPERATURE (°C)
100
VSHDN = 0V
0.5
8
9
10
100
VOUT = 1.8V
IL = 0
2.5 TJ = 25°C
2.0
1.5
VSHDN = VIN
1.0
VSHDN = 0V
0
125
Quiescent Current
2.0
1.5
VSHDN = VIN
1.0
VSHDN = 0V
0.5
0.5
3 4 5 6 7
INPUT VOLTAGE (V)
50
25
75
0
TEMPERATURE (°C)
3021 G22
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
1.0
2
1.79
3.0
VOUT = 1.5V
IL = 0
2.5 TJ = 25°C
VSHDN = VIN
1
1.80
1.77
–50 –25
125
3.0
VOUT = 1.2V
IL = 0
2.5 TJ = 25°C
0
1.81
Quiescent Current
1.5
ILOAD = 1mA
3021 G23
Quiescent Current
125
1.78
3021 G28
2.0
100
1.82
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1.20
0
25
50
75
TEMPERATURE (°C)
Output Voltage
1.83
1.52
1.21
–25
3021 G05
Output Voltage
1.53
1.22
0
125
3021 G11
Output Voltage
1.23
VSHDN = 0V
0
–50
0
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
3021 G03
3021 G26
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
3021 G27
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
6
5
RL = 4.8Ω
IL = 250mA
4
3
RL = 24Ω
IL = 50mA RL = 120Ω
IL = 10mA
RL = 12Ω
IL = 100mA
2
RL = 1.2k, IL = 1mA
0
5
RL = 6Ω
IL = 250mA
4
3
1
0
2
3 4 5 6 7
INPUT VOLTAGE (V)
0
9
8
10
RL = 30Ω
IL = 50mA RL = 150Ω
IL = 10mA
RL = 15Ω
IL = 100mA
2
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
3021 G06
8
0.8
7
6
5
4
3
2
1
9
10
200
300
400
LOAD CURRENT (mA)
0.6
0.5
0.4
0.3
0.2
–25
0
25
50
75
TEMPERATURE (°C)
100
3.0
2.5
2.0
1.5
1.0
0
1
2
3 4 5 6 7 8
SHDN PIN VOLTAGE (V)
1.2
VIN = 1.7V
1.0
0.8
0.6
0
–50
9
10
500
REVERSE OUTPUT CURRENT (µA)
CURRENT LIMIT (A)
SHDN PIN INPUT CURRENT (µA)
VIN = 10V
1.4
0.2
3021 G10
10
Reverse Output Current
0.4
125
9
3021 G09
VOUT = 0V
1.6
100
8
3.5
3021 G08
4
0
25
50
75
TEMPERATURE (°C)
3 4 5 6 7
INPUT VOLTAGE (V)
2
4.0
0
125
1.8
1
1
0.5
2.0
2
0
4.5
Current Limit
3
RL = 1.8k, IL = 1mA
3021 G25
IL = 1mA
0
–50
500
VSHDN = 10V
–25
2
SHDN Pin Input Current
0.7
SHDN Pin Input Current
0
–50
3
5.0
3021 G07
5
8
0.1
100
RL = 7.2Ω
IL = 250mA RL = 36Ω
IL = 50mA RL = 180Ω
IL = 10mA
RL = 18Ω
IL = 100mA
4
0
SHDN PIN INPUT CURRENT (µA)
0.9
SHDN PIN THRESHOLD (V)
GND PIN CURRENT (mA)
VSHDN = 10V
0
5
SHDN Pin Threshold
1.0
9
0
6
3021 G24
GND Pin Current vs ILOAD
10
RL = 3.6Ω
IL = 500mA
7
1
RL = 1.5k, IL = 1mA
0
VOUT = 1.8V
TJ = 25°C
8
6
1
1
9
VOUT = 1.5V
TJ = 25°C
RL = 3Ω
IL = 500mA
7
GND PIN CURRENT (mA)
GND PIN CURRENT (mA)
VOUT = 1.2V
TJ = 25°C
RL = 2.4Ω
IL = 500mA
7
GND Pin Current
8
GND PIN CURRENT (mA)
8
VIN = 0V
450 VOUT = 1.2V
400
350
300
250
200
150
100
50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
3021 G12
0
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
3021 G13
3021fa
6
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Ripple Rejection
50
COUT = 22µF
40
30
COUT = 4.7µF
20
10 VIN = 1.5V + 50mVRMS RIPPLE
VOUT = 0.5V
I = 500mA
0 L
10
1k
10k
100
FREQUENCY (Hz)
100k
1M
100
2.5
90
2.0
80
1.5
LOAD REGULATION (mV)
60
INPUT RIPPLE REJECTION (dB)
70
70
60
50
40
30
20
VIN = 1.5V + 0.5VP-P RIPPLE AT 120Hz
10 VOUT = 0.5V
IL = 500mA
0
0
25
50
75 100
–50 –25
TEMPERATURE (°C)
3021 G14
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
OUTPUT SINK CURRENT (mA)
16
14
12
10
8
6
4
2
5
10
15
OUTPUT OVERSHOOT (%)
0
0.5
0
–0.5
–1.0 V = 1.15V
IN
–1.5 VOUT = 0.5V
*LOAD REGULATION NUMBER REFERS
–2.0 TO CHANGE IN THE 200mV REFERENCE
VOLTAGE
–2.5
0
25
50
75 100
–50 –25
TEMPERATURE (°C)
3021 G17
20
10
VOUT = 1.2V
IL = 500mA
COUT = 4.7µF
1
0.1
0.01
10
100
1k
10k
FREQUENCY (Hz)
3021 G20
100k
1M
3021 G18
RMS Output Noise vs Load
Current (10Hz to 100kHz)
300
125
Output Noise Spectral Density
No-Load Recovery Threshold
0
125
1.0
3021 G15
18
Transient Response
VOUT = 1.2V
COUT = 4.7µF
250
OUTPUT NOISE (µVRMS)
INPUT RIPPLE REJECTION (dB)
Load Regulation
∆IL = 1mA to 500mA
Input Ripple Rejection
VOUT
50mV/DIV
200
150
IOUT
500mA/DIV
100
50
0
0.01
0.1
1
10
LOAD CURRENT (mA)
100
50µs/DIV
IOUT = 50mA TO 500mA
VIN = 1.5V
VOUT = 1.2V
COUT = 22µF
3021 G21
3021 G19
3021fa
7
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U
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PI FU CTIO S
(DH Package/S8 Package)
OUT (Pins 3, 4/Pin 2): These pins supply power to the load.
Use a minimum output capacitor of 3.3µF to prevent oscillations. Applications with large load transients require larger
output capacitors to limit peak voltage transients. See the
Applications Information section for more information on
output capacitance and reverse output characteristics.
SENSE (Pin 7/Pin 3, Fixed Voltage Device Only): This pin
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).
The ADJ pin reference voltage is 200mV (referred to GND).
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
resistor supplies the pull-up current to the open collector/
drain logic, normally several microamperes, and the SHDN
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. The output impedance of a battery rises with frequency, 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
reverse voltage appears at the load. The device protects itself
and the load.
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)
SHDN
(9/5)
R3
THERMAL
SHUTDOWN
SHUTDOWN
D1
–
ERROR AMP
200mV
BIAS CURRENT
AND
REFERENCE
GENERATOR
+
Q3
CURRENT
GAIN
Q1
OUT
(3,4/2)
D2
212mV
OUT SENSE
(7/3)
–
NO-LOAD
RECOVERY
Q2
R2
+
ADJ
(7/3)
25k
NOTE:
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.
FIXED
VOUT
1.2V
1.5V
1.8V
R1
R1
R2
20k 100k
20k 130k
20k 160k
GND
(8,10,17/4,6)
3021 BD
3021fa
8
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U
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APPLICATIO S I FOR ATIO
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 systems. 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 startup or normal operation.
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. 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.
IN
VIN
OUT
LT3021
SHDN
R2
+
VOUT
ADJ
GND
R1
( )
3021 F01
VOUT = 200mV 1 + R2 – IADJ (R2)
R1
VADJ = 200mV
IADJ = 20nA AT 25°C
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
0.4mV at VADJ = 200mV. At VOUT = 1.5V, load regulation is:
(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 capacitors. 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. 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 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.
Give extra consideration to the use of ceramic capacitors.
Manufacturers make ceramic capacitors with a variety of
dielectrics, each with a different behavior across temperature 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
characterisitics and are more suitable for use as the output
capacitor 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.
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or microphone
works. For a ceramic capacitor, the stress can be induced
by vibrations in the system or thermal transients. The resulting voltages produced can cause appreciable amounts
3021fa
9
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
U
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APPLICATIO S I FOR ATIO
20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
CHANGE IN VALUE (%)
0
X5R
–20
1mV/DIV
–40
–60
Y5V
–80
–100
0
2
4
14
8
6
10 12
DC BIAS VOLTAGE (V)
16
VOUT = 1.3V
COUT = 10µF
ILOAD = 0
1ms/DIV
3021 F04
3021 F02
Figure 2. Ceramic Capacitor DC Bias Characteristics
40
CHANGE IN VALUE (%)
20
X5R
0
–20
–40
Y5V
–60
–80
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
–100
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
3021 F03
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
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 overshooting until the regulator lowers the amount of current it
delivers to the new level. The regulator 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 microfarads of output capacitance.
Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor
To eliminate this problem, the LT3021 incorporates a
no-load or light-load recovery circuit. This circuit is a
voltage-controlled current sink that significantly improves
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.
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
current sink remains on until the external circuitry releases
the output. However, if the external circuitry pulls the
output 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.
Thermal Considerations
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:
1. Output current multiplied by the input-to-output voltage 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
current curves in the Typical Performance Characteristics.
Power dissipation is equal to the sum of the two components listed above.
3021fa
10
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
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APPLICATIO S I FOR ATIO
The LT3021 regulator has internal thermal limiting (with
hysteresis) designed to protect the device during overload
conditions. For normal continuous conditions, do not
exceed 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.
The underside of the LT3021 DH package has exposed metal
(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 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.
The LT3021 S8 package has pin 4 fused with the lead
frame. This also allows heat to transfer from the die to the
printed circuit board metal, therefore reducing the thermal
resistance. Copper board stiffeners and plated throughholes can also be used to spread the heat generated by
power devices.
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.
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:
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
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
temperature rise above ambient is approximately equal to:
0.41W(52.5°C/W) = 21.5°C
The maximum junction temperature equals the maximum
junction temperature rise above ambient plus the maximum ambient temperature or:
TJMAX = 21.5°C + 70°C = 91.5°C
Table 1. Measured Thermal Resistance For DH Package
COPPER AREA
TOPSIDE*
BACKSIDE
BOARD AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
2500mm2
2500mm2
2500mm2
30°C/W
900mm2
2500mm2
2500mm2
35°C/W
2
2
2500mm2
50°C/W
2500mm2
2500mm2
55°C/W
2
2
65°C/W
225mm
2500mm
100mm2
2
50mm
2500mm
2500mm
Table 2. Measured Thermal Resistance For S8 Package
COPPER AREA
TOPSIDE* BACKSIDE
BOARD AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
2500mm2
2500mm2
2500mm2
70°C/W
2
2
2500mm2
70°C/W
2
2
1000mm
2
2500mm
225mm
2500mm
2500mm
78°C/W
100mm2
2500mm2
2500mm2
84°C/W
50mm2
2500mm2
2500mm2
96°C/W
*Device is mounted on topside.
Protection Features
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 reverseinput voltages, reverse-output voltages and reverse
output-to-input voltages.
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.
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
in backwards.
3021fa
11
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
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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 (but is limited by) the resistor divider that sets the output
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.
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 increases 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,
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, 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 connected under the same conditions, there will be additional
V/R current.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to
ground, pulled to some intermediate voltage or is left open
circuit. In the case where the input is grounded, there is
less than 1µA of reverse output 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 capacitors 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 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 selfinductance. 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-inductance to about one-fifth of a single isolated wire.
3021fa
12
LT3021/LT3021-1.2/
LT3021-1.5/LT3021-1.8
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APPLICATIO S I FOR ATIO
If the LT3021 is powered by a battery mounted in close
proximity on the same circuit board, a 3.3µF input capacitor 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 addition 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
also vary. Extra capacitance may also be placed directly on
the output of the power supply; however, this will require
an order of magnitude more capacitance as opposed to
placing extra capacitance in close proximity to the LT3021.
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.
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
5.00 ±0.10
R = 0.20
TYP
5.00 ±0.10
9
0.40 ± 0.05
16
3.45 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(SEE NOTE 6)
PIN 1
NOTCH
(DH16) DFN 0204
8
0.200 REF
1
0.25 ± 0.05
0.50 BSC
0.75 ±0.05
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)
NOTE 3
.045 ±.005
.050 BSC
8
.245
MIN
7
6
5
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
× 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
3
4
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
2
.014 – .019
(0.355 – 0.483)
TYP
INCHES
(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)
.050
(1.270)
BSC
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 representation 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
VIN: 4.2V to 30V/36V, VOUT: 3.75V to 30V, VDO = 0.42V, IQ = 30µA,
ISD = 16µA, Reverse-Battery Protection, SOT-223, S8, Z Packages
LT1129
700mA, Micropower LDO
VIN: 4.2V to 30V, VOUT: 3.75V to 30V, VDO = 0.4V, IQ = 50µA, ISD = 16µA,
DD, SOT-223, S8, TO220-5, TSSOP20 Packages
LT1761
100mA, Low Noise Micropower LDO
LT1762
150mA, Low Noise Micropower LDO
LT1763
500mA, Low Noise Micropower LDO
LT1764/LT1764A
3A, Low Noise, Fast Transient Response LDOs
VIN: 1.8V to 20V, VOUT: 1.22V to 20V, VDO = 0.3V, IQ = 20µA, ISD < 1µA,
Low Noise: < 20µVRMSP-P, Stable with 1µF Ceramic Capacitor,
ThinSOT Package
VIN: 1.8V to 20V, VOUT: 1.22V to 20V, VDO = 0.3V, IQ = 25µA, ISD < 1µA,
Low Noise: <20µVRMSP-P, MS8 Package
VIN: 1.8V to 20V, VOUT: 1.22V to 20V, VDO = 0.3V, IQ = 30µA, ISD < 1µA,
Low Noise: < 20µVRMSP-P, S8 Package
VIN: 2.7V to 20V, VOUT: 1.21V to 20V, VDO = 0.34V, IQ = 1mA, ISD < 1µA,
Low Noise: <40µVRMSP-P, “A” Version Stable with Ceramic Capacitors,
DD, TO220-5 Packages
LTC1844
150mA, Low Noise, Micropower VLDO
VIN: 1.6V to 6.5V, VOUT(MIN) = 1.25V, VDO = 0.09V, IQ = 35µA,
ISD < 1µA, Low Noise: < 30µVRMS, ThinSOT Package
LT1962
300mA, Low Noise Micropower LDO
LT1963/LT1963A
1.5A, Low Noise, Fast Transient Response LDOs
VIN: 1.8V to 20V, VOUT: 1.22V to 20V, VDO = 0.27V, IQ = 30µA, ISD < 1µA,
Low Noise: < 20µVRMSP-P, MS8 Package
VIN: 2.1V to 20V, VOUT: 1.21V to 20V, VDO = 0.34V, IQ = 1mA, ISD < 1µA,
Low Noise: < 40µVRMSP-P, “A” Version Stable with Ceramic Capacitors,
DD, TO220-5, SOT223, S8 Packages
LT3010
50mA, High Voltage, Micropower LDO
LT3020
100mA, Low Voltage LDO
LTC3025
300mA, Low Voltage Micropower LDO
VIN: 0.9V to 5.5V, VOUT: 0.4V to 3.6V (min), VDO = 0.05V, IQ = 54µA,
Stable with 1µF Ceramic Capacitors, DFN-6 Package
LTC3026
1.5A, Low Input Voltage VLDO Regulator
LT3150
Low VIN, Fast Transient Response, VLDO Controller
VIN: 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V),
VDO = 0.1V, IQ = 950µA, Stable with 10µF Ceramic Capacitors, 10-Lead
MSOP and DFN-10 Packages
VIN: 1.1V to 10V, VOUT: 1.21V to 10V, VDO = Set by External MOSFET
RDS(ON), 1.4MHz Boost Converter Generates Gate Drive, SSOP16 Package
VIN: 3V to 80V, VOUT: 1.275V to 60V, VDO = 0.3V, IQ = 30µA, ISD < 1µA,
Low Noise: <100µVRMSP-P, Stable with 1µF Output Capacitor, Exposed
MS8 Package
VIN: 0.9V to 10V, VOUT: 0.2V to 5V (min), VDO = 0.15V, IQ = 120µA,
Noise: <250µVRMSP-P, Stable with 2.2µF Ceramic Capacitors,
DFN-8, MS8 Packages
3021fa
16
Linear Technology Corporation
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