LT3085EMS8E#TRPBF Linear Technology, LT3085EMS8E#TRPBF Datasheet

IC LDO REG ADJ 500MA 8-MSOP

LT3085EMS8E#TRPBF

Manufacturer Part Number
LT3085EMS8E#TRPBF
Description
IC LDO REG ADJ 500MA 8-MSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LT3085EMS8E#TRPBF

Regulator Topology
Positive Adjustable
Voltage - Output
Adjustable
Voltage - Input
1.2 ~ 36 V
Voltage - Dropout (typical)
1.35V @ 500mA
Number Of Regulators
1
Current - Output
500mA
Current - Limit (min)
500mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-MSOP Exposed Pad, 8-HMSOP, 8-eMSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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LT3085EMS8E#TRPBF
Manufacturer:
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LT3085EMS8E#TRPBF
0
FEATURES
APPLICATIONS
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TYPICAL APPLICATION
Outputs May be Paralleled for Higher Current and
Heat Spreading
Output Current: 500mA
Single Resistor Programs Output Voltage
1% Initial Accuracy of SET Pin Current
Output Adjustable to 0V
Current Limit Constant with Temperature
Low Output Noise: 40μV
Wide Input Voltage Range: 1.2V to 36V
Low Dropout Voltage: 275mV
< 1mV Load Regulation
< 0.001%/ V Line Regulation
Minimum Load Current: 0.5mA
Stable with Minimum 2.2μF Ceramic Capacitor
Current Limit with Foldback and Overtemperature
Protected
8-Lead MSOP, and 6-Lead 2mm × 3mm DFN Packages
High Current All Surface Mount Supply
High Effi ciency Linear Regulator
Post Regulator for Switching Supplies
Low Parts Count Variable Voltage Supply
Low Output Voltage Power Supplies
1.2V TO 36V
V
Variable Output Voltage 500mA Supply
IN
V
CONTROL
1μF
IN
SET
RMS
R
V
SET
OUT
LT3085
+
= R
(10Hz to 100kHz)
SET
• 10μA
3085 TA01a
OUT
V
2.2μF
OUT
DESCRIPTION
The LT
can be paralleled to increase output current or spread
heat on surface mounted boards. Designed as a precision
current source and voltage follower, this new regulator
fi nds use in many applications requiring high current,
adjustability to zero, and no heat sink. The device also
brings out the collector of the pass transistor to allow
low dropout operation—down to 275mV—when used
with a second supply.
A key feature of the LT3085 is the capability to supply a
wide output voltage range. By using a reference current
through a single resistor, the output voltage is programmed
to any level between zero and 36V. The LT3085 is stable
with 2.2μF of capacitance on the output, and the IC uses
small ceramic capacitors that do not require additional
ESR as is common with other regulators.
Internal protection circuitry includes current limiting
and thermal limiting. The LT3085 is offered in the 8-lead
MSOP and a low profi le (0.75mm) 6-lead 2mm × 3mm
DFN package (both with an Exposed Pad for better thermal
characteristics).
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO
and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Adjustable 500mA Single
®
3085 is a 500mA low dropout linear regulator that
9.80
Resistor Low Dropout
SET PIN CURRENT DISTRIBUTION (μA)
N = 1676
9.90
10.00
10.10
Regulator
3085 TA01b
10.20
LT3085
3085fb
1

Related parts for LT3085EMS8E#TRPBF

LT3085EMS8E#TRPBF Summary of contents

Page 1

... MSOP and a low profi le (0.75mm) 6-lead 2mm × 3mm DFN package (both with an Exposed Pad for better thermal characteristics). L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...

Page 2

... JMAX JA EXPOSED PAD (PIN 7) IS OUT, MUST BE SOLDERED TO V SEE THE APPLICATIONS INFORMATION SECTION ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT3085EDCB#PBF LT3085EDCB#TRPBF LT3085EMS8E#PBF LT3085EMS8E#TRPBF LT3085IDCB#PBF LT3085IDCB#TRPBF LT3085IMS8E#PBF LT3085IMS8E#TRPBF LT3085MPMS8E#PBF LT3085MPMS8E#TRPBF LEAD BASED FINISH TAPE AND REEL LT3085EDCB LT3085EDCB#TR ...

Page 3

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

Page 4

LT3085 TYPICAL PERFORMANCE CHARACTERISTICS Set Pin Current 10.20 10.15 10.10 10.05 10.00 9.95 9.90 9.85 9.80 –50 – 100 125 150 TEMPERATURE (°C) 3085 G01 Offset Voltage Distribution N = 1676 –2 – ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage (Minimum IN Voltage) 400 350 I = 500mA LOAD 300 250 200 150 I = 100mA LOAD 100 50 0 –50 – 100 125 TEMPERATURE (°C) 3085 G10 Current Limit 700 ...

Page 6

LT3085 TYPICAL PERFORMANCE CHARACTERISTICS V Pin Current CONTROL 500mA 12 LOAD 10 DEVICE IN 8 CURRENT LIMIT 1mA LOAD INPUT-TO-OUTPUT DIFFERENTIAL ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Error Amplifi er Gain and Phase 100mA LOAD 500mA LOAD 3 0 –3 –6 –9 10 100 1k FREQUENCY (Hz) PIN FUNCTIONS (DCB/MS8E) V (Pin 4/Pin 5): ...

Page 8

LT3085 BLOCK DIAGRAM APPLICATIONS INFORMATION The LT3085 regulator is easy to use and has all the pro- tection features expected in high performance regulators. Included are short-circuit protection and safe operating area protection, as well as thermal shutdown. The LT3085 ...

Page 9

APPLICATIONS INFORMATION The LT3085 can be operated in two modes. Three terminal mode has the control pin connected to the power input pin which gives a limitation of 1.35V dropout. Alternatively, the “control” pin can be tied to a higher ...

Page 10

LT3085 APPLICATIONS INFORMATION Input Capacitance and Stability The LT3085 is designed to be stable with a minimum capacitance of 1μF at each input pin. Ceramic capacitors with low ESR are available for use to bypass these pins, but in cases ...

Page 11

APPLICATIONS INFORMATION in a small package, but they tend to have strong voltage and temperature coeffi cients as shown in Figures 2 and 3. When used with a 5V regulator, a 16V 10μF Y5V capacitor can exhibit an effective value ...

Page 12

LT3085 APPLICATIONS INFORMATION The worst-case offset between the SET pin and the output of only ±1.5mV allows very small ballast resistors to be used. As shown in Figure 4, the two devices have a small 10mΩ and 20mΩ ballast resistors, ...

Page 13

APPLICATIONS INFORMATION between the devices is within 2°C, showing excellent tracking between the devices. The board temperature has reached approximately 40°C within about 0.75 inches of each device. While 90° acceptable operating temperature for these devices, this is ...

Page 14

LT3085 APPLICATIONS INFORMATION The problem occurs with a heavy output load when the input voltage is high and the output voltage is low. Com- mon situations are immediately after the removal of a short circuit. The load line for such ...

Page 15

APPLICATIONS INFORMATION If the LT3085 is confi gured as a three-terminal (single supply) regulator with IN and V shorted together, the internal CONTROL diode of the IN pin will protect the V Like any other regulator, exceeding the maximum input- ...

Page 16

LT3085 APPLICATIONS INFORMATION The power in the output transistor equals – V )(I ) OUTPUT IN OUT OUT The total power equals TOTAL DRIVE OUTPUT The current delivered to the SET pin ...

Page 17

APPLICATIONS INFORMATION Without series resistor R , power dissipation in the LT3085 S equals: 0. – 3.3V • – 3.3V TOTAL 60 = 0.86W If the voltage differential (V ) across the NPN ...

Page 18

LT3085 TYPICAL APPLICATIONS 10V CONTROL 499k 18 Higher Output Current MJ4502 50Ω IN LT3085 V CONTROL + 100μF – 1μF OUT SET 332k Current Source IN LT3085 V CONTROL + ...

Page 19

TYPICAL APPLICATIONS Adding Shutdown LT3085 CONTROL + – SET Q1 ON OFF R1 VN2222LL SHUTDOWN * Q2 INSURES ZERO OUTPUT IN THE ABSENCE OF ANY OUTPUT LOAD 12V V CONTROL C1 1μF OUT V ...

Page 20

LT3085 TYPICAL APPLICATIONS 4.8V to 28V LT3085 28V V CONTROL + – C1 1.5μF SET R1 249k 20 Adding Soft-Start LT3085 CONTROL + D1 C1 1N4148 1μF – SET C2 R1 ...

Page 21

TYPICAL APPLICATIONS 12V TO 18V V CONTROL + 15μF SET 10k V IN 50V BUZ11 + 10μ Lab Supply LT3085 IN V CONTROL + 1Ω – 0.25W OUT + 15μF 50k 0A TO 0.5A ...

Page 22

LT3085 TYPICAL APPLICATIONS V 5V 10μF *4mV DROP ENSURES LT3085 IS OFF WITH NO LOAD MULTIPLE LT3085’S CAN BE USED 22 Reference Buffer IN LT3085 CONTROL + – OUT INPUT SET OUTPUT LT1019 C1 GND 1μF Ground ...

Page 23

TYPICAL APPLICATIONS Low Voltage, High Current Adjustable High Effi ciency Regulator † 2. 100μF LTC3414 2.2MEG 100k ×2 PGOOD RUN/SS 1000pF SYNC/MODE SGND *DIFFERENTIAL VOLTAGE ON LT3085 IS 0.6V SET BY THE V ...

Page 24

LT3085 TYPICAL APPLICATIONS CMDSH-4E † 4.5V TO 25V V IN 10μF 1μF 100k SHDN 0.1μF *DIFFERENTIAL VOLTAGE ON LT3085 ≈ 1.4V SET BY THE TPO610L P-CHANNEL THRESHOLD. † MAXIMUM OUTPUT VOLTAGE IS 2V BELOW INPUT VOLTAGE 24 Adjustable High Effi ...

Page 25

PACKAGE DESCRIPTION 1.65 0.05 3.55 0.05 (2 SIDES) 2.15 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 BAR TOP MARK (SEE NOTE 6) 0.200 REF NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (TBD) ...

Page 26

LT3085 PACKAGE DESCRIPTION 1.88 0.102 (.074 .004) 5.23 (.206) MIN 0.42 0.038 (.0165 .0015) TYP RECOMMENDED SOLDER PAD LAYOUT DETAIL “A” 0.254 (.010) GAUGE PLANE DETAIL “A” 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. ...

Page 27

... Added 200k resistor to drawing 3085 TA19 in Typical Applications section Updated Package Description drawings 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. LT3085 ...

Page 28

... Set, Directly Parallelable OUT , V : 2.5V to 20V, TO-220, DD, SOT-223 RMS 1.8V to 20V 1.2V to 19.5V, RMS IN OUT = 0.1V 0.8V, TSSOP Package OUT(MIN) = 0.6V 20μA, I < 1μA, OUT(MIN 0.8V 60μA, I < 1μA, 10-Lead MS or OUT(MIN 0610 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2008 3085fb ...

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