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LT3085MPMS8E#PBF

Description
IC REG LIN POS ADJ 500MA 8MSOP
Categorysemiconductor    Power management   
File Size285KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LT3085MPMS8E#PBF Overview

IC REG LIN POS ADJ 500MA 8MSOP

LT3085MPMS8E#PBF Parametric

Parameter NameAttribute value
Output configurationjust
Output typeAdjustable
Number of voltage regulators1
Voltage - input (maximum)36V
Voltage - Output (minimum/fixed)0V
Voltage - Output (maximum)36V
Pressure drop (maximum)0.45V @ 500mA
Current - Output500mA
Current - static (Iq)10.1µA
Current - Power (maximum)1mA
PSRR90dB ~ 20dB(120Hz ~ 1MHz)
Control characteristics-
Protective functionOvercurrent, overtemperature, short circuit
Operating temperature-55°C ~ 125°C
Installation typesurface mount
Package/casing8-TSSOP, 8-MSOP (0.118", 3.00mm wide) exposed pad
Supplier device packaging8-MSOP-EP
FEATURES
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LT3085
Adjustable 500mA Single
Resistor Low Dropout
Regulator
DESCRIPTION
The LT
®
3085 is a 500mA low dropout linear regulator that
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
finds 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 profile (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.
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
RMS
(10Hz to 100kHz)
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
APPLICATIONS
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High Current All Surface Mount Supply
High Efficiency Linear Regulator
Post Regulator for Switching Supplies
Low Parts Count Variable Voltage Supply
Low Output Voltage Power Supplies
TYPICAL APPLICATION
Variable Output Voltage 500mA Supply
V
IN
1.2V TO 36V
IN
V
CONTROL
LT3085
N = 1676
1μF
SET
+
OUT
V
OUT
2.2μF
9.80
10.00
10.20
9.90
10.10
SET PIN CURRENT DISTRIBUTION (μA)
3085 TA01b
R
SET
V
OUT
= R
SET
• 10μA
3085 TA01a
3085fb
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