lt3082ets8 Linear Technology Corporation, lt3082ets8 Datasheet

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lt3082ets8

Manufacturer Part Number
lt3082ets8
Description
200ma Single Resistor Low Dropout Linear Regulator
Manufacturer
Linear Technology Corporation
Datasheet

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APPLICATIONS
TYPICAL APPLICATION
FEATURES
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Outputs May Be Paralleled for Higher Output
Current or Heat Spreading
Maximum Output Current: 200mA
Wide Input Voltage Range: 1.2V to 40V
Output Adjustable to 0V
Stable with Minimum 2.2μF Ceramic Capacitors
Single Resistor Sets Output Voltage
Initial Set Pin Current Accuracy: 1%
Low Output Noise: 33μV
Reverse-Battery Protection
Reverse-Current Protection
<1mV Load Regulation Typical
<0.001%/V Line Regulation Typical
Current Limit and Thermal Shutdown Protection
Available in 8-Lead SOT-23, 3-Lead SOT-223 and
8-Lead 3mm × 3mm DFN Packages
All-Surface Mount Power Supply
Post Regulator for Switching Supplies
Low Parts Count Variable Voltage Supply
Low Output Voltage Supply
Battery Powered Regulator
Variable Output Voltage Battery Powered Supply
0.1μF
9V
C
SET
1μF
R
500k
SET
IN
SET
10μA
+
LT3082
RMS
(10Hz to 100kHz)
OUT
C
2.2μF
OUT
V
OUT
3082 TA01a
= 10μA • R
SET
DESCRIPTION
The LT
can be paralleled to increase output current or spread heat
in surface mounted boards. Architected as a precision
current source and voltage follower, this regulator benefi ts
many applications requiring high current, adjustability to
zero and no heat sink. The LT3082 withstands reverse
input voltages and reverse output-to-input voltages without
reverse-current fl ow.
A key feature of the LT3082 is the capability to supply a
wide output voltage range. A precision “0” TC 10μA ref-
erence current source drives a single resistor to program
the output voltage to any level between zero and 38.5V.
The LT3082 is stable with only 2.2μF of capacitance on
the output; the IC uses small ceramic capacitors that
do not require additional ESR as is common with other
regulators.
Internal protection circuitry includes reverse-battery and
reverse-current protection, current limiting and ther-
mal limiting. The LT3082 is offered in the thermally en-
hanced 8-lead TSOT-23, 3-lead SOT-223 and 8-lead 3mm
× 3mm DFN packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
200mA Single Resistor Low
Dropout Linear Regulator
®
3082 is a 200mA low dropout linear regulator that
10.100
10.075
10.050
10.025
10.000
9.975
9.950
9.925
9.900
SET Pin Current vs Temperature
–50
–25
0
TEMPERATURE (°C)
25
50
75
100
125
3082 TA01b
LT3082
150
1
3082f

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lt3082ets8 Summary of contents

Page 1

FEATURES Outputs May Be Paralleled for Higher Output n Current or Heat Spreading n Maximum Output Current: 200mA Wide Input Voltage Range: 1.2V to 40V n n Output Adjustable Stable with Minimum 2.2μF Ceramic Capacitors Single Resistor ...

Page 2

... LT3082IST LT3082IST#TR LT3082MPST LT3082MPST#TR LT3082ETS8 LT3082ETS8#TR LT3082ITS8 LT3082ITS8#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T PARAMETER SET Pin Current I SET Offset Voltage (V – OUT SET OS Load Regulation (Note 7) ΔI ΔV Line Regulation ΔI ΔV Minimum Load Current (Note ...

Page 4

LT3082 TYPICAL PERFORMANCE CHARACTERISTICS SET Pin Current 10.100 10.075 10.050 10.025 10.000 9.975 9.950 9.925 9.900 –50 100 125 150 – TEMPERATURE (°C) Offset Voltage Distribution N = 1326 –2 – DISTRIBUTION (mV) ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage 1.6 1 –55° 25° 125°C 0.8 J 0.6 0.4 0 100 125 150 175 50 LOAD CURRENT (mA) 3082 G09 Current ...

Page 6

LT3082 TYPICAL PERFORMANCE CHARACTERISTICS Residual Output for Less Than Minimum Load Current 800 SET PIN = 0V 700 OUT V = 36V IN 600 R TEST 500 400 300 200 100 0 0 ...

Page 7

PIN FUNCTIONS (DD/ST/TS8) IN (Pins 7, 8/Pin 3/Pins 7, 8): Input. This pin supplies power to regulate internal circuitry and supply output load current. For the device to operate properly and regulate, the voltage on this pin must be 1.2V ...

Page 8

LT3082 APPLICATIONS INFORMATION Introduction The LT3082 regulator is easy to use and has all the pro- tection features expected in high performance regulators. Included are reverse-input, reverse-output and reverse input-to-output protection for sensitive circuitry and loads. Additional protection includes short-circuit ...

Page 9

APPLICATIONS INFORMATION Table 1. 1% Resistors for Common Output Voltages V (V) OUT 1 1.2 1.5 1.8 2.5 3.3 5 With a 10μA current source generating the reference voltage, leakage paths to or from the SET pin can create errors ...

Page 10

LT3082 APPLICATIONS INFORMATION electrics, each with different behavior across temperature and applied voltage. The most common dielectrics used are specifi ed with EIA temperature characteristic codes of Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are good for ...

Page 11

APPLICATIONS INFORMATION two equal inductors in parallel, but placing them in close proximity gives the wires mutual inductance adding to the self-inductance. The second and most effective way to reduce overall inductance is to place both forward and return current ...

Page 12

LT3082 APPLICATIONS INFORMATION The LT3082 uses a unity-gain follower from the SET pin to the OUT pin. Therefore, multiple possibilities exist (besides a SET pin resistor) to set output voltage. For example, using a high accuracy voltage reference from SET ...

Page 13

APPLICATIONS INFORMATION Tables 3 through 5 list thermal resistance as a function of copper areas in a fi xed board size. All measurements were taken in still air on a 4-layer FR-4 board with 1oz solid internal planes and 2oz ...

Page 14

LT3082 APPLICATIONS INFORMATION Protection Features The LT3082 incorporates several protection features ideal for battery-powered circuits, among other applications. In addition to normal monolithic regulator protection features such as current limiting and thermal limiting, the LT3082 protects itself against reverse-input voltages, ...

Page 15

TYPICAL APPLICATIONS V IN 12V V IN 4.8V to 40V LT3082 40V 10μA + – C1 1.5μF SET R1 249k Using a Lower Value SET Resistor LT3082 IN 10μA + – C1 1μF SET OUT ...

Page 16

LT3082 TYPICAL APPLICATIONS Adding Shutdown LT3082 10μA + – SET Q1 ON OFF R1 VN2222LL SHUTDOWN * Q2 INSURES ZERO OUTPUT IN THE ABSENCE OF ANY OUTPUT LOAD. 10k V IN 50V + ...

Page 17

PACKAGE DESCRIPTION 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 0.25 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (NOTE 6) 0.200 REF DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698) ...

Page 18

LT3082 PACKAGE DESCRIPTION (6.30 – 6.71) (2.90 – 3.15) .264 – .287 (6.70 – 7.30) .130 – .146 (3.30 – 3.71) .0905 (2.30) BSC .071 (1.80) MAX (0.60 – 0.84 Package 3-Lead Plastic SOT-223 (Reference LTC DWG # ...

Page 19

... JEDEC PACKAGE REFERENCE IS MO-193 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. TS8 Package ...

Page 20

... Dropout VLDO Linear Regulator LT3080/LT3080-1 1.1A, Parallelable, Low Noise, Low Dropout Linear Regulator LT3085 500mA, Parallelable, Low Noise, Low Dropout Linear Regulator ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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