LT1085CM#PBF Linear Technology, LT1085CM#PBF Datasheet

IC LDO REG ADJUSTABLE 3A DDPAK-3

LT1085CM#PBF

Manufacturer Part Number
LT1085CM#PBF
Description
IC LDO REG ADJUSTABLE 3A DDPAK-3
Manufacturer
Linear Technology
Datasheet

Specifications of LT1085CM#PBF

Regulator Topology
Positive Adjustable
Voltage - Output
1.25 ~ 28.5 V
Voltage - Input
2.55 ~ 30 V
Voltage - Dropout (typical)
1.3V @ 3A
Number Of Regulators
1
Current - Output
3A
Current - Limit (min)
3.2A
Operating Temperature
0°C ~ 150°C
Mounting Type
Surface Mount
Package / Case
TO-263-2, D⊃2Pak (2 leads + Tab), TO-263AB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Part Number
Manufacturer
Quantity
Price
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Part Number:
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Manufacturer:
LT
Quantity:
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LT1085CM#PBF
Manufacturer:
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Quantity:
20 000
APPLICATIONS
*For a 1.5A low dropout regulator see the LT1086 data sheet.
TYPICAL APPLICATION
FEATURES
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3-Terminal Adjustable
Output Current of 3A, 5A or 7.5A
Operates Down to 1V Dropout
Guaranteed Dropout Voltage at Multiple Current Levels
Line Regulation: 0.015%
Load Regulation: 0.1%
100% Thermal Limit Functional Test
Fixed Versions Available
Available in 3-Lead Plastic TO-220, TO-3P and DD
Packages
High Effi ciency Linear Regulators
Post Regulators for Switching Supplies
Constant Current Regulators
Battery Chargers
V
IN
≥ 6.5V
*REQUIRED FOR STABILITY
DEVICE
LT1083
LT1084
LT1085
+
10μF
IN
5V, 7.5A Regulator
LT1083
ADJ
OUT
OUTPUT CURRENT*
121Ω
1%
365Ω
1%
7.5A
5.0A
3.0A
+
10μF*
TANTALUM
1083/4/5 ADJ TA01
5V AT 7.5A
Positive Adjustable Regulators
DESCRIPTION
The LT
designed to provide 7.5A, 5A and 3A with higher effi ciency
than currently available devices. All internal circuitry is
designed to operate down to 1V input-to-output differential
and the dropout voltage is fully specifi ed as a function of
load current. Dropout is guaranteed at a maximum of 1.5V
at maximum output current, decreasing at lower load cur-
rents. On-chip trimming adjusts the reference voltage to
1%. Current limit is also trimmed, minimizing the stress
on both the regulator and power source circuitry under
overload conditions.
The LT1083/LT1084/LT1085 devices are pin compatible
with older 3-terminal regulators. A 10μF output capacitor
is required on these new devices. However, this is included
in most regulator designs.
Unlike PNP regulators, where up to 10% of the output cur-
rent is wasted as quiescent current, the LT1083 quiescent
current fl ows into the load, increasing effi ciency.
All other trademarks are the property of their respective owners.
, LT, LTM and LTM are registered trademarks of Linear Technology Corporation.
7.5A, 5A, 3A Low Dropout
®
1083 series of positive adjustable regulators are
LT1083/LT1084/LT1085
2
1
0
0
Dropout Voltage vs Output Current
OUTPUT CURRENT
1083/4/5 ADJ TA02
I
FULL LOAD
108345fg
1

Related parts for LT1085CM#PBF

LT1085CM#PBF Summary of contents

Page 1

... Unlike PNP regulators, where up to 10% of the output cur- rent is wasted as quiescent current, the LT1083 quiescent current fl ows into the load, increasing effi ciency. 7.5A , LT, LTM and LTM are registered trademarks of Linear Technology Corporation. 5.0A All other trademarks are the property of their respective owners. 3. 7.5A 121Ω ...

Page 2

LT1083/LT1084/LT1085 ABSOLUTE MAXIMUM RATINGS Power Dissipation ................................Internally Limited Input-to-Output Voltage Differential C-Grades ..............................................................30V I-Grades ................................................................30V M-Grades (OBSOLETE) .........................................35V Operating Junction Temperature Range (Note 9) C-Grades: Control Section .................. 0°C to 125°C Power Transistor ................ 0°C to 150°C I-Grades: Control Section ...

Page 3

... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT1083CP#PBF LT1083CP#TRPBF LT1084CP#PBF LT1084CP#TRPBF LT1084CT#PBF LT1084CT#TRPBF LT1084IT#PBF LT1084IT#TRPBF LT1085CT#PBF LT1085CT#TRPBF LT1085IT#PBF LT1085IT#TRPBF LT1085CM#PBF LT1085CM#TRPBF LT1085IM#PBF LT1085IM#TRPBF LEAD BASED FINISH TAPE AND REEL LT1083CP LT1083CP#TR LT1084CP LT1084CP#TR LT1084CT LT1084CT#TR LT1084IT LT1084IT#TR LT1085CT LT1085CT#TR LT1085IT ...

Page 4

LT1083/LT1084/LT1085 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T PARAMETER CONDITIONS Reference Voltage I OUT (V IN 10mA ≤ I 1.5V ≤ (V Line Regulation I LOAD M-Grade: 15V ≤ (V C-, I-Grades: 15V ≤ (V Load Regulation ...

Page 5

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T PARAMETER CONDITIONS Thermal Resistance Junction-to-Case Control Circuitry/Power Transistor LT1083 K Package P Package LT1084 K Package P Package T Package LT1085 K Package M, T Package Note 1: Stresses beyond ...

Page 6

LT1083/LT1084/LT1085 TYPICAL PERFORMANCE CHARACTERISTICS LT1083 Dropout Voltage 2 INDICATES GUARANTEED TEST POINT –40°C ≤ T ≤ 150°C J 0°C ≤ T ≤ 125° 150° 25° –55° ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Minimum Operating Current 150° 25° –55° INPUT/OUTPUT DIFFERENTIAL (V) ...

Page 8

LT1083/LT1084/LT1085 TYPICAL PERFORMANCE CHARACTERISTICS LT1085 Ripple Rejection 100 V ≤ RIPPLE P-P RIPPLE 90 ≤ 0.5V P – ≥ OUT – ≥ OUT DROPOUT 50 ...

Page 9

BLOCK DIAGRAM THERMAL V ADJ APPLICATIONS INFORMATION The LT1083 family of 3-terminal adjustable regulators is easy to use and has all the protection features that are expected in high performance voltage regulators. They are short-circuit protected, and have safe area ...

Page 10

LT1083/LT1084/LT1085 APPLICATIONS INFORMATION Normally, capacitor values on the order of 100μF are used in the output of many regulators to ensure good transient response with heavy load current changes. Output capaci- tance can be increased without limit and larger values ...

Page 11

APPLICATIONS INFORMATION The problem occurs with a heavy output load when the input voltage is high and the output voltage is low, such as immediately after removal of a short. The load line for such a load may intersect the ...

Page 12

LT1083/LT1084/LT1085 APPLICATIONS INFORMATION Connected as shown not multiplied by the divider P ratio about 0.004Ω per foot using 16-gauge wire. P This translates to 4mV/ load current im- portant to keep ...

Page 13

TYPICAL APPLICATION T1 TRIAD C30B F-269U 20Ω 110VAC 20Ω 1 C30B 1N4003 1N4003 1μF 560Ω 82k 15k 10k 1N4148 * 1% FILM RESISTOR L: DALE TO-5 TYPE T2: STANCOR 11Z-2003 GENERAL PURPOSE REGULATOR WITH SCR PREREGULATOR TO LOWER ...

Page 14

LT1083/LT1084/LT1085 TYPICAL APPLICATION *C1 IMPROVES RIPPLE REJECTION. X SHOULD BE < RIPPLE FREQUENCY LT1083 IN ADJ + 10μF RETURN 14 Paralleling Regulators 2 FEET #18 WIRE* IN LT1083 OUT ADJ 0.015Ω ...

Page 15

TYPICAL APPLICATION High Effi ciency Regulator with Switching Preregulator V IN 28V 10k 1k 1mH IN LT1083 + ADJ MR1122 10,000μF 470Ω 1N914 28V 1M 4N28 10k + LT1011 10k – 28V 1N914 1.2V to 15V Adjustable Regulator V LT1083 ...

Page 16

LT1083/LT1084/LT1085 PACKAGE DESCRIPTION .760 – .775 .320 – .350 (19.30 – 19.69) (8.13 – 8.89) .420 – .480 (10.67 – 12.19) .060 .256 (1.524) (6.502) .060 .183 (1.524) (4.648) .075 (1.905) .300 (7.620) BOTTOM VIEW OF DD PAK HATCHED AREA ...

Page 17

... BSC 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. P Package 3-Lead Plastic TO-3P (Similar to TO-247) (Reference LTC DWG # 05-08-1450) .620 – ...

Page 18

... Very Low Dropout Linear Regulator LT1430 High Power Step-Down Switching Regulator UltraFast ™ Transient Response LDO Controller LT1575 LT1573 UltraFast Transient Response LDO Controller UltraFast is a trademark of Linear Technology Corporation. Linear Technology Corporation 18 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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