LT3050 Series
100mA, Linear Regulator
with Precision Current Limit
and Diagnostic Outputs
FEATURES DESCRIPTION
th
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Output Current Monitor: 1/100 of I
The LT 3050 series are micro-power, low noise, low
OUT
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Fault Indicator: Current Limit, Minimum I or
dropout voltage (LDO) linear regulators. The devices
OUT
Thermal Limit
supply 100mA of output current with a dropout voltage of
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Output Current: 100mA 340mV. A 10nF bypass capacitor reduces output noise to
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Dropout Voltage: 340mV 30V in a 10Hz to 100kHz bandwidth and soft-starts
RMS
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Input Voltage Range: 1.6V to 45V the reference. The LT3050s 45V input voltage rating
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Programmable Precision Current Limit: 5% combined with its precision current limit and diagnostic
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Programmable Minimum I Monitor functions make the IC an ideal choice for robust, high
OUT
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reliability applications.
Low Noise: 30V (10Hz to 100kHz)
RMS
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Adjustable Output (V = V = 0.6V)
REF OUT(MIN)
A single resistor programs the LT3050s current limit, accurate
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Fixed Output Voltages: 3.3V, 5V
to 5% over a wide input voltage and temperature range.
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Output Tolerance: 2% Over Line, Load and Temperature
A single resistor programs the LT3050s minimum output
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Stable with Low ESR, Ceramic Output Capacitors
current monitor, useful for detecting open-circuit conditions.
(2.2F minimum)
The current monitor function sources a current equal to
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Shutdown Current: <1A
1/100th of output current. A logic FAULT pin asserts low if
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Reverse-Battery, Reverse-Output and
the LT3050 is in current limit, operating below its minimum
Reverse-Current Protection
output current (open-circuit) or is in thermal shutdown.
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Thermal Limit Protection
The LT3050 optimizes stability and transient response
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12-Lead 3mm 2mm DFN and MSOP Packages
with low ESR ceramic capacitors, requiring a minimum of
2.2F. The LT3050 is available in xed output voltages of
APPLICATIONS
3.3V and 5V, and as an adjustable version with an output
n voltage range down to the 0.6V reference.The LT3050 is
Protected Antenna Supplies
n available in the thermally-enhanced 12-Lead 3mm 2mm
Automotive Telematics
DFN and MSOP packages.
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Industrial Applications (Trucks, Forklifts, etc.)
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
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High Reliability Applications
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
External Current Limit R = 1.15k
IMAX
105
5V Supply with 100mA Precision Current Limit, 10mA I
MIN
V = 5V
OUT
104
IN OUT
5V
103
12V
SHDN
2.2F
V = 15V
1F 120k 102 IN
V
IN
101
FAULT
100
V = 12V
LT3050-5 IN
I
99
MAX
I
TO P ADC
MON
1.15k
10nF
V = 5.6V
IN
98
3k
(THRESHOLD = 100mA)
0.1F
(ADC FULL SCALE = 3V)
97
I REF/BYP 96
MIN
11.3k
0.1F
GND
95
10nF
(THRESHOLD = 10mA)
75 50 25 0 25 50 75 100 125 150 175
3050 TA01 TEMPERATURE (C)
3050 TA01a
3050fa
1
CURRENT LIMIT FAULT THRESHOLD (mA)LT3050 Series
ABSOLUTE MAXIMUM RATINGS (Note 1)
IN Pin Voltage ........................................................ 50V FAULT Pin Voltage ..........................................0.3V, 50V
OUT Pin Voltage ..................................................... 50V Output Short-Circuit Duration .......................... Inde nite
Input-to-Output Differential Voltage ....................... 50V Operating Junction Temperature Range (Notes 2, 3)
ADJ Pin Voltage (Note 16) ..................................... 50V E, I Grades .........................................40C to 125C
REF/BYP Pin Voltage ........................................0.3V, 1V MP Grade ...........................................55C to 125C
SHDN Pin Voltage ...................................................50V Storage Temperature Range ...................65C to 150C
I Pin Voltage ..............................................0.3V, 7V Lead Temperature: Soldering, 10 sec .................... 300C
MON
I Pin Voltage ...............................................0.3V, 7V (MSOP Package Only)
MIN
I Pin Voltage ...............................................0.3V, 7V
MAX
PIN CONFIGURATION
TOP VIEW
TOP VIEW
1
REF/BYP 12 I
MON
REF/BYP 1 12 I
MON
I 2 11 I
MIN MAX
I 2 11 I
MIN MAX
13 FAULT 3 10 GND
FAULT 3 10 GND
13
GND
SHDN 4 9 ADJ GND
SHDN 4 9 ADJ
IN 5 8 OUT
IN 8 OUT
5
6
IN 7 OUT
IN 6 7 OUT
MSE PACKAGE
12-LEAD PLASTIC MSOP DDB PACKAGE
12-LEAD (3mm s 2mm) PLASTIC DFN
T = 125C, = 45C/W, = 5C/W TO 10C/W
JMAX JA JC
T = 125C, = 49C/W, = 13.5C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
JMAX JA JC
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3050EMSE#PBF LT3050EMSE#TRPBF 3050 12-Lead Plastic MSOP 40C to 125C
LT3050IMSE#PBF LT3050IMSE#TRPBF 3050 12-Lead Plastic MSOP 40C to 125C
LT3050MPMSE#PBF LT3050MPMSE#TRPBF 3050 12-Lead Plastic MSOP 55C to 125C
LT3050EMSE-3.3#PBF LT3050EMSE-3.3#TRPBF 305033 12-Lead Plastic MSOP 40C to 125C
LT3050IMSE-3.3#PBF LT3050IMSE-3.3#TRPBF 305033 12-Lead Plastic MSOP 40C to 125C
LT3050MPMSE-3.3#PBF LT3050MPMSE-3.3#TRPBF 305033 12-Lead Plastic MSOP 55C to 125C
LT3050EMSE-5#PBF LT3050EMSE-5#TRPBF 30505 12-Lead Plastic MSOP 40C to 125C
LT3050IMSE-5#PBF LT3050IMSE-5#TRPBF 30505 12-Lead Plastic MSOP 40C to 125C
LT3050MPMSE-5#PBF LT3050MPMSE-5#TRPBF 30505 12-Lead Plastic MSOP 55C to 125C
LT3050EDDB#PBF LT3050EDDB#TRPBF LFGC 12-Lead (3mm 2mm) Plastic DFN 40C to 125C
LT3050IDDB#PBF LT3050IDDB#TRPBF LFGC 12-Lead (3mm 2mm) Plastic DFN 40C to 125C
LT3050EDDB-3.3#PBF LT3050EDDB-3.3#TRPBF LFWR 12-Lead (3mm 2mm) Plastic DFN 40C to 125C
LT3050IDDB-3.3#PBF LT3050IDDB-3.3#TRPBF LFWR 12-Lead (3mm 2mm) Plastic DFN 40C to 125C
3050fa
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