LT3024
Dual 100mA/500mA
Low Dropout, Low Noise,
Micropower Regulator
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
Low Noise: 20µV
RMS
(10Hz to 100kHz)
Low Quiescent Current: 30µA/Output
Wide Input Voltage Range: 1.8V to 20V
Output Current: 100mA/500mA
Very Low Shutdown Current: <0.1
µ
A
Low Dropout Voltage: 300mV at 100mA/500mA
Adjustable Outputs from 1.22V to 20V
Stable with 1µF/3.3µF Output Capacitor
Stable with Aluminum, Tantalum or
Ceramic Capacitors
Reverse-Battery Protected
No Reverse Current
No Protection Diodes Needed
Overcurrent and Overtemperature Protected
Thermally Enhanced 16-Lead TSSOP and 12-Lead
(4mm
×
3mm) DFN Packages
APPLICATIO S
s
s
s
s
s
Cellular Phones
Pagers
Battery-Powered Systems
Frequency Synthesizers
Wireless Modems
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LT
®
3024 is a dual, micropower, low noise, low drop-
out regulator. With an external 0.01µF bypass capacitor,
output noise drops to 20µV
RMS
over a 10Hz to 100kHz
bandwidth. Designed for use in battery-powered systems,
the low 30µA quiescent current per output makes it an
ideal choice. In shutdown, quiescent current drops to less
than 0.1µA. Shutdown control is independent for each
output, allowing for flexibility in power management. The
device is capable of operating over an input voltage range
of 1.8V to 20V. The device can supply 100mA of output
current from Output 2 with a dropout voltage of 300mV.
Output 1 can supply 500mA of output current with a
dropout voltage of 300mV. Quiescent current is well
controlled in dropout.
The LT3024 regulator is stable with output capacitors as
low as 1µF for the 100mA output and 3.3µF for the 500mA
output. Small ceramic capacitors can be used without the
series resistance required by other regulators.
Internal protection circuitry includes reverse-battery pro-
tection, current limiting, thermal limiting and reverse
current protection. The device is available as an adjustable
device with a 1.22V reference voltage. The LT3024 regu-
lator is available in the thermally enhanced 16-lead TSSOP
and 12-lead, low profile (4mm
×
3mm
×
0.75mm) DFN
packages.
TYPICAL APPLICATIO
IN
V
IN
3.7V TO
20V
1µF
SHDN1
SHDN2
BYP1
ADJ1
OUT1
3.3V/2.5V Low Noise Regulators
0.01µF
10µF
3.3V AT 500mA
20µV
RMS
NOISE
10Hz to 100kHz Output Noise
422k
LT3024
OUT2
0.01µF
BYP2
ADJ2
GND
249k
2.5V AT 100mA
20µV
RMS
NOISE
V
OUT
100µV/DIV
261k
10µF
249k
3024 TA01a
U
20µV
RMS
3024 TA01b
U
U
3024f
1
LT3024
ABSOLUTE
AXI U
RATI GS
IN 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
GND
BYP1
OUT1
OUT1
GND
OUT2
BYP2
GND
1
2
3
4
5
6
7
8
17
16 GND
15 ADJ1
14 SHDN1
13 IN
12 IN
11 SHDN2
10 ADJ2
9
GND
ORDER PART
NUMBER
LT3024EFE
BYP1
OUT1
OUT1
GND
OUT2
1
2
3
FE PART
MARKING
3024EFE
FE PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 38°C/ W,
θ
JC
= 8°C/ W
EXPOSED PAD (PIN 17) IS GND
MUST BE SOLDERED TO PCB
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The
q
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, 11)
ADJ1, ADJ2 Pin Voltage
(Notes 3, 4)
Line Regulation (Note 3)
Load Regulation (Note 3)
CONDITIONS
Output 2, I
LOAD
= 100mA
Output 1, I
LOAD
= 500mA
V
IN
= 2V, I
LOAD
= 1mA
Output 2, 2.3V < V
IN
< 20V, 1mA < I
LOAD
< 100mA
Output 1, 2.3V < V
IN
< 20V, 1mA < I
LOAD
< 500mA
∆V
IN
= 2V to 20V, I
LOAD
= 1mA
Output 2, V
IN
= 2.3V,
∆I
LOAD
= 1mA to 100mA
V
IN
= 2.3V,
∆I
LOAD
= 1mA to 100mA
Output 1, V
IN
= 2.3V,
∆I
LOAD
= 1mA to 500mA
V
IN
= 2.3V,
∆I
LOAD
= 1mA to 500mA
q
q
q
q
q
q
2
U
U
W
W W
U
W
(Note 1)
Operating Junction Temperature Range
(Note 2) ............................................ – 40°C to 125°C
Storage Temperature Range
FE Package ....................................... – 65°C to 150°C
DE Package ...................................... – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
12 ADJ1
11 SHDN1
10 IN
13
4
5
6
9
8
7
IN
SHDN2
ADJ2
ORDER PART
NUMBER
LT3024EDE
BYP2
DE PART
MARKING
3024
DE12 PACKAGE
12-LEAD (4mm
×
3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 40°C/ W,
θ
JC
= 10°C/ W
EXPOSED PAD (PIN 13) IS GND
MUST BE SOLDERED TO PCB
MIN
TYP
1.8
1.8
MAX
2.3
2.3
1.235
1.250
1.250
10
12
25
12
25
UNITS
V
V
V
V
V
mV
mV
mV
mV
mV
1.205
1.190
1.190
1.220
1.220
1.220
1
1
1
q
3024f
LT3024
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C. (Note 2)
PARAMETER
Dropout Voltage
(Output 2)
V
IN
= V
OUT(NOMINAL)
(Notes 5, 6, 11)
CONDITIONS
I
LOAD
= 1mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 100mA
Dropout Voltage
(Output 1)
V
IN
= V
OUT(NOMINAL)
(Notes 5, 6, 11)
I
LOAD
= 10mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 100mA
I
LOAD
= 500mA
I
LOAD
= 500mA
GND Pin Current
(Output 2)
V
IN
= V
OUT(NOMINAL)
(Notes 5, 7)
GND Pin Current
(Output 1)
V
IN
= V
OUT(NOMINAL)
(Notes 5, 7)
I
LOAD
= 0mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 0mA
I
LOAD
= 1mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 250mA
I
LOAD
= 500mA
C
OUT
= 10µF, C
BYP
= 0.01µF, I
LOAD
= Full Current,
BW = 10Hz to 100kHz
ADJ1, ADJ2 (Notes 3, 8)
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN1
, V
SHDN2
= 0V
V
SHDN1
, V
SHDN2
= 20V
V
IN
= 6V, V
SHDN1
= 0V, V
SHDN2
= 0V
V
IN
= 2.72V (Avg), V
RIPPLE
= 0.5V
P-P
, f
RIPPLE
= 120Hz,
I
LOAD
= Full Current
Output 2, V
IN
= 7V, V
OUT
= 0V
V
IN
= 2.3V,
∆V
OUT
= – 0.1V
Output 1, V
IN
= 7V, V
OUT
= 0V
V
IN
= 2.3V,
∆V
OUT
= – 0.1V
Input Reverse Leakage Current
Reverse Output Current
(Notes 3,10)
V
IN
= – 20V, V
OUT
= 0V
V
OUT
= 1.22V, V
IN
< 1.22V
q
q
q
q
q
q
q
q
MIN
TYP
0.10
0.17
MAX
0.15
0.19
0.22
0.29
0.31
0.40
0.35
0.45
0.19
0.25
0.22
0.32
0.34
0.44
0.35
0.45
45
90
400
2
4
75
120
1.6
3
8
16
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
µA
µA
µA
mA
mA
µA
µA
mA
mA
mA
mA
µV
RMS
q
0.24
q
0.30
q
0.13
q
0.17
q
0.20
q
0.30
q
q
q
q
q
q
q
q
q
q
q
q
20
55
230
1
2.2
30
65
1.1
2
5
11
20
30
0.25
0.80
0.65
0
1
0.01
55
65
200
110
700
520
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
SHDN1/SHDN2 Pin Current
(Note 9)
Quiescent Current in Shutdown
Ripple Rejection
Current Limit
100
1.4
0.5
3.0
0.1
nA
V
V
µA
µA
µA
dB
mA
mA
mA
mA
1
5
10
mA
µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LT3024 regulator is tested and specified under pulse load
conditions such that T
J
≈
T
A
. The LT3024 is 100% production tested at
T
A
= 25°C. Performance at – 40°C and 125°C is assured by design,
characterization and correlation with statistical process controls.
Note 3:
The LT3024 is tested and specified for these conditions with the
ADJ1/ADJ2 pin connected to the corresponding OUT1/OUT2 pin.
3024f
3
LT3024
ELECTRICAL CHARACTERISTICS
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 LT3024 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. Total GND pin current is equal to the sum of GND pin currents
from Output 1 and Output 2.
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:
Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the rated output voltage. This current flows into the OUT
pin and out the GND pin.
Note 11:
For the LT3024 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.
TYPICAL PERFOR A CE CHARACTERISTICS
Output 2
Typical Dropout Voltage
500
450
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
350
300
250
200
150
100
50
0
0
T
J
= 125°C
350
300
250
200
150
100
50
0
T
J
≤
125°C
T
J
≤
25°C
DROPOUT VOLTAGE (mV)
400
T
J
= 25°C
10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
3024 G01
Output 1
Typical Dropout Voltage
500
GUARANTEED DROPOUT VOLTAGE (mV)
450
DROPOUT VOLTAGE (mV)
T
J
= 125°C
350
300
250
200
150
100
50
0
0
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
3024 G04
350
300
250
200
150
100
50
0
0
T
J
≤
125°C
T
J
≤
25°C
DROPOUT VOLTAGE (mV)
400
T
J
= 25°C
4
U W
Output 2
Guaranteed Dropout Voltage
500
450
400
500
Output 2 Dropout Voltage
450
400
350
300
250
200
150
100
50
I
L
= 50mA
I
L
= 10mA
I
L
= 1mA
I
L
= 100mA
= TEST POINTS
0
10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
3024 G02
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
3024 G03
Output 1
Guaranteed Dropout Voltage
500
450
400
Output 1 Dropout Voltage
500
450
400
350
300
250
200
150
100
50
I
L
= 10mA
50
25
0
75
TEMPERATURE (°C)
I
L
= 1mA
I
L
= 50mA
I
L
= 500mA
I
L
= 250mA
I
L
= 100mA
= TEST POINTS
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
3024 G05
0
–50 –25
100
125
3024 G06
3024f
LT3024
TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Current (Per Output)
50
45
1.240
1.235
QUIESCENT CURRENT (µA)
QUIESCENT CURRENT (µA)
40
35
30
25
20
15
10
5 V
IN
= 6V
R
L
= 250k, I
L
= 5µA
0
0
25
–50 –25
V
SHDN
= V
IN
ADJ PIN VOLTAGE (V)
50
75
TEMPERATURE (°C)
3024 G07
Output 2 GND Pin Current
2.50
2.25
T
J
= 25°C
*FOR V
OUT
= 1.22V
2.50
2.25
GND PIN CURRENT (mA)
GND PIN CURRENT (mA)
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
0
1
2
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
GND PIN CURRENT (µA)
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)
Output 1 GND Pin Current
12
10
GND PIN CURRENT (mA)
12
8
6
4
2
0
R
L
= 2.44Ω
I
L
= 500mA*
R
L
= 4.07Ω
I
L
= 300mA*
SHDN PIN THRESHOLD (V)
T
J
= 25°C
V
IN
= V
SHDN
*FOR V
OUT
= 1.22V
GND PIN CURRENT (mA)
R
L
= 12.2Ω
I
L
= 100mA*
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
U W
100
3024 G10
ADJ1 or ADJ2 Pin Voltage
I
L
= 1mA
40
Quiescent Current (Per Output)
T
J
= 25°C
35 R
L
= 250k
30
25
20
15
10
5
0
V
SHDN
= 0V
0
2
4
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
3024 G09
1.230
1.225
1.220
1.215
1.210
1.205
V
SHDN
= V
IN
125
1.200
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
3024 G08
Output 2
GND Pin Current vs I
LOAD
V
IN
= V
OUT(NOMINAL)
+ 1V
1200
1000
800
600
400
200
0
Output 1 GND Pin Current
2.00
R
L
= 24.4Ω
I
L
= 50mA*
T
J
= 25°C
V
IN
= V
SHDN
*FOR V
OUT
= 1.22V
R
L
= 122Ω
I
L
= 10mA*
R
L
= 1.22k
I
L
= 1mA*
0
1
2
3 4 5 6 7
INPUT VOLTAGE (V)
8
9
10
0
10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
3024 G11
3024 G12
Output 1
GND Pin Current vs I
LOAD
V
IN
= V
OUT(NOMINAL)
+ 1V
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
SHDN1 or SHDN2 Pin Threshold
(On-to-Off)
I
L
= 1mA
10
8
6
4
2
8
9
10
0
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
3024 G14
0
–50 –25
50
0
75
25
TEMPERATURE (°C)
100
125
3024 G13
3024 G15
3024f
5
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