LT3027
Dual 100mA,
Low Dropout, Low Noise,
Micropower Regulator with
Independent Inputs
FEATURES
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DESCRIPTIO
Low Noise: 20µV
RMS
(10Hz to 100kHz)
Low Quiescent Current: 25µA/Channel
Independent Inputs
Wide Input Voltage Range: 1.8V to 20V
Output Current: 100mA/Channel
Very Low Shutdown Current: <0.1
µ
A
Low Dropout Voltage: 300mV at 100mA
Adjustable Output from 1.22V to 20V
Stable with 1µF Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
Reverse Battery Protected
No Protection Diodes Needed
Overcurrent and Overtemperature Protected
Thermally Enhanced 10-Lead MSOP and DFN
Packages
APPLICATIO S
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Cellular Phones
Pagers
Battery-Powered Systems
Frequency Synthesizers
Wireless Modems
The LT
®
3027 is a dual, micropower, low noise, low drop-
out regulator with independent inputs. With an external
0.01µF bypass capacitor, output noise is a low 20µV
RMS
over a 10Hz to 100kHz bandwidth. Designed for use in
battery-powered systems, the low 25µA quiescent current
per channel makes it an ideal choice. In shutdown, quies-
cent current drops to less than 0.1µA. Shutdown control
is independent for each channel, allowing for flexibility in
power management. The device is capable of operating
over an input voltage from 1.8V to 20V, and can supply
100mA of output current from each channel with a drop-
out voltage of 300mV. Quiescent current is well controlled
in dropout.
The LT3027 regulator is stable with output capacitors as
low as 1µF. Small ceramic capacitors can be used without
the series resistance required by other regulators.
Internal protection circuitry includes reverse battery pro-
tection, current limiting and thermal limiting protection.
The device is available as an adjustable device with a
1.22V reference voltage. The LT3027 regulator is available
in the thermally enhanced 10-lead MSOP and low profile
(0.75mm) 3mm
×
3mm DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patents, including 6118263, 6144250.
TYPICAL APPLICATIO
V
IN1
3.7V TO
20V
IN1
1µF
SHDN1
BYP1
ADJ1
OUT1
3.3V/2.5V Low Noise Regulators
10Hz to 100kHz Output Noise
3.3V AT 100mA
20µV
RMS
NOISE
0.01µF
422k
10µF
249k
LT3027
V
IN2
2.9V TO
20V
IN2
1µF
SHDN2
BYP2
ADJ2
OUT2
0.01µF
261k
2.5V AT 100mA
20µV
RMS
NOISE
10µF
V
OUT
100µV/DIV
GND
249k
3027 TA01
U
20µV
RMS
3027 TA01b
U
U
3027f
1
LT3027
ABSOLUTE
AXI U
RATI GS
IN1, IN2 Pin Voltage ..............................................
±20V
OUT1, OUT2 Pin Voltage .......................................
±20V
Input to Output Differential Voltage .......................
±20V
ADJ1, ADJ2 Pin Voltage .........................................
±7V
BYP1, BYP2 Pin Voltage .......................................
±0.6V
SHDN1, SHDN2 Pin Voltage .................................
±20V
Output Short-Circut Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW
BYP2
ADJ2
SHDN2
ADJ1
BYP1
1
2
3
4
5
11
10 OUT2
9 IN2
8 IN1
7 SHDN1
6 OUT1
ORDER PART
NUMBER
LT3027EDD
LT3027IDD
DD PART
MARKING
LBKN
LBMC
BYP2
ADJ2
SHDN2
ADJ1
BYP1
1
2
3
4
5
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
EXPOSED PAD (PIN 11) IS GND
MUST BE SOLDERED TO PCB
T
JMAX
= 125°C,
θ
JA
= 43°C/ W,
θ
JC
= 3°C/ W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
PARAMETER
Minimum Input Voltage
(Notes 3, 10)
ADJ1, ADJ2 Pin Voltage
(Note 3, 4)
Line Regulation (Note 3)
Load Regulation (Note 3)
Dropout Voltage
V
IN
= V
OUT(NOMINAL)
(Notes 5, 6, 10)
CONDITIONS
I
LOAD
= 100mA
V
IN
= 2V, I
LOAD
= 1mA
2.3V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
∆V
IN
= 2V to 20V, I
LOAD
= 1mA
V
IN
= 2.3V,
∆I
LOAD
= 1mA to 100mA
V
IN
= 2.3V,
∆I
LOAD
= 1mA to 100mA
I
LOAD
= 1mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 100mA
●
2
U
U
W
W W
U
W
(Note 1)
Operating Junction Temperature Range
(Note 2) ............................................ – 40°C to 125°C
Storage Temperature Range
DD Package ...................................... – 65°C to 125°C
MSE Package ................................... – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
10
9
8
7
6
OUT2
IN2
IN1
SHDN1
OUT1
ORDER PART
NUMBER
LT3027EMSE
LT3027IMSE
MSE PART
MARKING
LTBKK
LTBMD
11
MSE PACKAGE
10-LEAD PLASTIC MSOP
EXPOSED PAD (PIN 11) IS GND
MUST BE SOLDERED TO PCB
T
JMAX
= 150°C,
θ
JA
= 40°C/ W,
θ
JC
= 10°C/ W
MIN
TYP
1.8
MAX
2.3
1.235
1.250
10
12
25
0.15
0.19
0.22
0.29
0.28
0.38
0.35
0.45
UNITS
V
V
V
mV
mV
mV
V
V
V
V
V
V
V
V
●
●
●
1.205
1.190
1.220
1.220
1
1
0.10
●
0.17
●
0.24
●
0.30
●
3027f
LT3027
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
PARAMETER
GND Pin Current (Per Channel)
V
IN
= V
OUT(NOMINAL)
(Notes 5, 7)
CONDITIONS
I
LOAD
= 0mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 100mA
C
OUT
= 10µF, C
BYP
= 0.01µF, I
LOAD
= 100mA, BW = 10Hz to 100kHz
(Notes 3, 8)
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN
= 0V
V
SHDN
= 20V
V
IN
= 6V, V
SHDN
= 0V (Both SHDN Pins)
V
IN
= 2.72V (Avg), V
RIPPLE
= 0.5V
P-P
, f
RIPPLE
= 120Hz,
I
LOAD
= 100mA
V
IN
= 7V, V
OUT
= 0V
V
IN
= 2.3V,
∆V
OUT
= – 5%
V
IN
= – 20V, V
OUT
= 0V
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
25
60
250
1
2.4
20
30
MAX
50
120
400
2
4
100
1.4
0.5
3
0.1
UNITS
µA
µA
µA
mA
mA
µV
RMS
nA
V
V
µA
µA
µA
dB
mA
mA
Output Voltage Noise
ADJ1/ADJ2 Pin Bias Current
Shutdown Threshold
SHDN1/SHDN2 Pin Current
(Note 9)
Quiescent Current in Shutdown
Ripple Rejection (Note 3)
Current Limit
Input Reverse Leakage Current
0.25
0.8
0.65
0
1
0.01
55
65
200
110
1
mA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LT3027 regulator is tested and specified under pulse load
conditions such that T
J
≈
T
A
. The LT3027E is guaranteed to meet
performance specifications from 0°C to 125°C junction temperature.
Specifications over the – 40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
statistical process controls. The LT3027I is guaranteed and tested over the
full – 40°C to 125°C operating junction temperature range.
Note 3:
The LT3027 is tested and specified for these conditions with the
ADJ1/ADJ2 pin connected to the corresponding OUT1/OUT2 pin.
Note 4:
Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply for
all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
Note 5:
To satisfy requirements for minimum input voltage, the LT3027 is
tested and specified for these conditions with an external resistor divider
(two 250k resistors) for an output voltage of 2.44V. The external resistor
divider will add a 5µA DC load on the output.
Note 6:
Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the
output voltage will be equal to: V
IN
– V
DROPOUT
.
Note 7:
GND pin current is tested with V
IN
= 2.44V and a current source
load. This means the device is tested while operating in its dropout region
or at the minimum input voltage specification. This is the worst-case GND
pin current. The GND pin current will decrease slightly at higher input
voltages.
Note 8:
ADJ1 and ADJ2 pin bias current flows into the pin.
Note 9:
SHDN1 and SHDN2 pin current flows into the pin.
Note 10:
For the LT3027 dropout voltage will be limited by the minimum
input voltage specification under some output voltage/load conditions. See
the curve of Minimum Input Voltage in the Typical Performance
Characteristics.
3027f
3
LT3027
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Dropout Voltage
500
450
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
400
350
300
250
200
150
100
50
0
0
10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
3027 G01
T
J
= 125°C
T
J
= 25°C
Quiescent Current
40
35
V
IN
= 6V
R
L
= 250k
I
L
= 5µA
V
SHDN
= V
IN
ADJ PIN VOLTAGE (V)
QUIESCENT CURRENT (µA)
30
25
20
15
10
5
0
–50 –25
1.230
1.225
1.220
1.215
1.210
1.205
QUIESCENT CURRENT (µA)
V
SHDN
= 0V
0
25
50
75
100
125
TEMPERATURE (°C)
3027 G03
GND Pin Current
2.50
2.25
GND PIN CURRENT (mA)
T
J
= 25°C
*FOR V
OUT
= 1.22V
SHDN PIN THRESHOLD (V)
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
0
1
2
GND PIN CURRENT (mA)
R
L
= 12.2Ω
I
L
= 100mA*
R
L
= 24.4Ω
I
L
= 50mA*
R
L
= 1.22k
I
L
= 1mA*
R
L
= 122Ω
I
L
= 10mA*
8
9
10
3 4 5 6 7
INPUT VOLTAGE (V)
4
U W
3027 G07
Guaranteed Dropout Voltage
500
450
400
350
300
250
200
150
100
50
0
0
10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
3027 G02
Dropout Voltage
500
450
400
350
300
250
200
150
100
50
0
–50 –25
I
L
= 50mA
I
L
= 10mA
I
L
= 1mA
I
L
= 100mA
= TEST POINTS
T
J
≤
125°C
T
J
≤
25°C
50
25
0
75
TEMPERATURE (°C)
100
125
3027 G03
ADJ1 or ADJ2 Pin Voltage
1.240
1.235
I
L
= 1mA
Quiescent Current
30
25
20
15
10
5
V
SHDN
= 0V
0
T
J
= 25°C
R
L
= 250k
I
L
= 5µA
V
SHDN
= V
IN
1.200
–50 –25
0
25
50
75
100
125
0
2
4
TEMPERATURE (°C)
3027 G05
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
3027 G06
GND Pin Current vs I
LOAD
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
0
10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
3027 G08
SHDN1 or SHDN2 Pin Threshold
(On-to-Off)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
I
L
= 1mA
V
IN
= V
OUT(NOMINAL)
+ 1V
3027 G09
3027f
LT3027
TYPICAL PERFOR A CE CHARACTERISTICS
SHDN1 or SHDN2 Pin Threshold
(Off-to-On)
1.0
0.9
SHDN PIN INPUT CURRENT (µA)
SHDN PIN THRESHOLD (V)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –25
I
L
= 100mA
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
SHDN PIN INPUT CURRENT (µA)
I
L
= 1mA
50
25
0
75
TEMPERATURE (°C)
ADJ1 or ADJ2 Pin Bias Current
100
90
ADJ PIN BIAS CURRENT (nA)
80
70
60
50
40
30
20
10
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
SHORT-CIRCUIT CURRENT (mA)
250
200
150
100
50
0
0
1
4
3
2
5
INPUT VOLTAGE (V)
6
7
3027 G14
CURRENT LIMIT (mA)
Input Ripple Rejection
80
70
RIPPLE REJECTION (dB)
80
70
RIPPLE REJECTION (dB)
60
50
40
30
20
I
L
= 100mA
10 V = 2.3V + 50mV
IN
RMS
RIPPLE C
OUT
= 1µF
C
BYP
= 0
0
0.1
100
0.01
1
10
1000
FREQUENCY (kHz)
3027 G18
U W
100
3027 G10
3027 G13
SHDN1 or SHDN2 Pin Input
Current
1.0
0.9
1.4
SHDN1 or SHDN2 Pin Input
Current
V
SHDN
= 20V
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25
125
0
1
2
3 4 5 6 7 8
SHDN PIN VOLTAGE (V)
9
10
50
25
0
75
TEMPERATURE (°C)
100
125
3027 G11
3027 G12
Current Limit
350
300
V
OUT
= 0V
T
J
= 25°C
350
300
250
200
150
100
50
Current Limit
V
IN
= 7V
V
OUT
= 0V
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
3027 G15
Input Ripple Rejection
C
BYP
= 0.01µF
C
BYP
= 1000pF
C
BYP
= 100pF
60
50
40
30
20
I
L
= 100mA
10 V = 2.3V + 50mV
IN
RMS
RIPPLE
C
OUT
= 10µF
0
0.1
0.01
1
10
FREQUENCY (kHz)
C
OUT
= 10µF
100
1000
3027 G19
3027f
5
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