IC LDO REG FXD 3.3V 800MA SOT223

LT1117CST-3.3#TRPBF

Manufacturer Part NumberLT1117CST-3.3#TRPBF
DescriptionIC LDO REG FXD 3.3V 800MA SOT223
ManufacturerLinear Technology
LT1117CST-3.3#TRPBF datasheet
 


Specifications of LT1117CST-3.3#TRPBF

Regulator TopologyPositive FixedVoltage - Output3.3V
Voltage - InputUp to 15VVoltage - Dropout (typical)1.1V @ 800mA
Number Of Regulators1Current - Limit (min)800mA
Operating Temperature0°C ~ 125°CMounting TypeSurface Mount
Package / CaseSOT-223 (3 leads + Tab), SC-73, TO-261Lead Free Status / RoHS StatusLead free / RoHS Compliant
Current - Output-  
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FEATURES
n
Space Saving SOT-223 Surface Mount Package
n
3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
n
Output Current of 800mA
n
Operates Down to 1V Dropout
n
Guaranteed Dropout Voltage at Multiple Current Levels
n
0.2% Line Regulation Max
n
0.4% Load Regulation Max
APPLICATIONS
n
Active SCSI Terminators
n
High Effi ciency Linear Regulators
n
Post Regulators for Switching Supplies
n
Battery Chargers
n
5V to 3.3V Linear Regulators
L, LT, LTC, LTM, Linear Technology, OPTI-LOOP and the Linear logo are registered trademarks
of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Active Terminator for SCSI-2 Bus
LT1117-2.85
IN
OUT
GND
+
+
4.75V TO
10μF
5.25V
Positive Regulators Adjustable
and Fixed 2.85V, 3.3V, 5V
DESCRIPTION
®
The LT
1117 is a positive low dropout regulator designed
to provide up to 800mA of output current. The device is
available in an adjustable version and fixed output voltages
of 2.85V, 3.3V and 5V. The 2.85V version is designed
specifically to be used in Active Terminators for the SCSI
bus. All internal circuitry is designed to operate down to 1V
input to output differential. Dropout voltage is guaranteed
at a maximum of 1.2V at 800mA, decreasing at lower load
currents. On chip trimming adjusts the reference/output
voltage to within ± 1%. Current limit is also trimmed in
order to minimize the stress on both the regulator and the
power source circuitry under overload conditions.
The low profi le surface mount SOT-223 package allows the
device to be used in applications where space is limited. The
LT1117 requires a minimum of 10μF of output capacitance
for stability. Output capacitors of this size or larger are
normally included in most regulator designs.
Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the quiescent current
of the LT1117 fl ows into the load, increasing effi ciency.
110Ω
110Ω
110Ω
18 TO 27
LINES
110Ω
22μF
1117 TA01
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
800mA Low Dropout
Dropout Voltage (V
– V
)
IN
OUT
1.4
–40°C ≤ T
< 0°C
J
1.2
0°C ≤ T
≤ 125°C
J
1.0
T
= 25°C
J
0.8
T
= 125°C
J
0.6
0.4
0.2
INDICATES GUARANTEED TEST POINT
0
0
100
200 300
400
500
600
700
800
OUTPUT CURRENT (mA)
1117 TA02
1117fd
1

LT1117CST-3.3#TRPBF Summary of contents

  • Page 1

    ... Battery Chargers 3.3V Linear Regulators L, LT, LTC, LTM, Linear Technology, OPTI-LOOP and the Linear logo are registered trademarks of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Active Terminator for SCSI-2 Bus LT1117-2 ...

  • Page 2

    ... T = 125°C, θ = 15°C/W JMAX JC ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT1117CST#PBF LT1117CST#TRPBF LT1117IST#PBF LT1117IST#TRPBF LT1117CST-2.85#PBF LT1117CST-2.85#TRPBF LT1117IST-2.85#PBF LT1117IST-2.85#TRPBF LT1117CST-3.3#PBF LT1117CST-3.3#TRPBF LT1117IST-3.3#PBF LT1117IST-3.3#TRPBF LT1117CST-5#PBF LT1117CST-5#TRPBF LT1117IST-5#PBF LT1117IST-5#TRPBF LT1117CM#PBF LT1117CM#TRPBF LT1117CM-2.85#PBF LT1117CM-2.85#TRPBF LT1117CM-3.3#PBF LT1117CM-3.3#TRPBF LT1117CM-5#PBF LT1117CM-5#TRPBF 2 Operating JunctionTemperature Range C Grade .................................................. 0°C to 125°C I Grade ...............................................– ...

  • Page 3

    ... ORDER INFORMATION LEAD BASED FINISH TAPE AND REEL LT1117CST LT1117CST#TR LT1117IST LT1117IST#TR LT1117CST-2.85 LT1117CST-2.85#TR LT1117IST-2.85 LT1117IST-2.85#TR LT1117CST-3.3 LT1117CST-3.3#TR LT1117IST-3.3 LT1117IST-3.3#TR LT1117CST-5 LT1117CST-5#TR LT1117IST-5 LT1117IST-5#TR LT1117CM LT1117CM#TR LT1117CM-2.85 LT1117CM-2.85#TR LT1117CM-3.3 LT1117CM-3.3#TR LT1117CM-5 LT1117CM-5#TR Consult LTC Marketing for parts specified with wider operating temperature ranges. ...

  • Page 4

    LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T PARAMETER Quiescent Current LT1117-2.85 LT1117-3.3 LT1117-5 Thermal Regulation Ripple Rejection Adjust Pin Current Adjust Pin Current Change Temperature Stability Long Term Stability RMS Output Noise Thermal Resistance Note 1: ...

  • Page 5

    TYPICAL PERFORMANCE CHARACTERISTICS LT1117 Ripple Rejection 100 V ≤ RIPPLE 90 V ≤ 3V P-P RIPPLE 0.5V P – V ≥ OUT – V ≥ OUT) DROPOUT 30 20 ...

  • Page 6

    LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 BLOCK DIAGRAM GND – THERMAL LIMIT ADJ OUT FOR FIXED VOLTAGE DEVICE 1117 BD01 1117fd ...

  • Page 7

    APPLICATIONS INFORMATION The LT1117 family of 3-terminal regulators are easy to use. They are protected against short circuit and thermal overloads. Thermal protection circuitry will shut down the regulator should the junction temperature exceed 165°C at the sense point. These ...

  • Page 8

    LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 APPLICATIONS INFORMATION Output Voltage The LT1117 develops a 1.25V reference voltage between the output and the adjust terminal (see Figure 2). By placing a resistor between these two terminals, a constant current is caused to flow through R1 ...

  • Page 9

    APPLICATIONS INFORMATION Experiments have shown that the heat spreading copper layer does not need to be electrically connected to the tab of the device. The PC material can be very effective at transmitting heat between the pad area, attached to ...

  • Page 10

    LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATIONS 1.2V to 10V Adjustable Regulator LT1117 V IN OUT IN R1 ADJ 121Ω + C1* 10μ NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS ( ) R2 † 1.25V 1 + ...

  • Page 11

    TYPICAL APPLICATIONS Battery Charger LT1117 IF OUT 1.25V ADJ R1 V – 1.25V 1 + OUT IF = –R S ΔIF = Δ V OUT –R S Improving Ripple Rejection LT1117 V IN OUT IN + ...

  • Page 12

    LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATIONS (HEAT SINK) Q1 2N6667 (DARLINGTON) + MDA201 + – 130VAC STANCOR TO 90VAC P-8685 (HEAT SINK) 2N6667 (DARLINGTON) + MDA201 + – FILM RESISTORS * = MOTOROLA MDA = PULSE ENGINEERING, INC. #PE-92106 L1 ...

  • Page 13

    PACKAGE DESCRIPTION .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 IS SOLDER PLATED COPPER HEAT SINK .420 .100 RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING ...

  • Page 14

    LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 PACKAGE DESCRIPTION .264 – .287 (6.70 – 7.30) .130 – .146 (3.30 – 3.71) .0905 (2.30) BSC .071 (1.80) MAX 14 ST Package 3-Lead Plastic SOT-223 (Reference LTC DWG # 05-08-1630) .248 – .264 (6.30 – 6.71) .114 ...

  • Page 15

    ... Updated DD-Pak part markings in Order Information section and revised all other sections. 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. ...

  • Page 16

    ... RMS 1.8V to 20V 1.2V to 19.5V, RMS IN OUT = V REF OUT(MIN 1.2V to 36V, RMS IN set; directly parallelable OUT , V : 1.2V to 36V, RMS IN set; directly parallelable OUT , Low I : 54μA, Fixed RMS Q LT 0410 REV D• PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1993 = Q 1117fd ...