Microsemi Corporation LX8117B-05CDT, LX8117B-05CDD, LX8117B-00CST, LX8117B-00CDT, LX8117B-00CDD Datasheet
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LIN D O C #: 8117 |
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LX8117-xx/8117A-xx/8117B-xx |
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0.8, 1 & 1.2A L O W DR O P O U T PO S I T I V E RE G U L AT O R S |
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T H E I N F I N I T E P O W E R O F I N N O V A T I O N |
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P R O D U C T I O N D A T A S H E E T |
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D E S C R I P T I O N
The LX8117/8117A/8117B series are positive Low Dropout (LDO) regulators. At the designed maximum load current, the LX8117 series dropout voltage is guaranteed to be 1.2V or lower at 0.8A (LX8117A 1.3V @ 1A). The dropout voltage decreases with load current.
An adjustable output voltage version of the LX8117/17A/17B is available, as well as versions with fixed outputs of 2.5V, 2.85V, 3.3V and 5V. The 2.85V version is specifically designed for use as a component of active termination networks for the SCSI bus. On-chip trimming of the internal voltage reference allows specification of the initial output voltage to within ±1% of its nominal value. The output current-limit point is also trimmed, which helps to minimize stress on both the regulator and the system power source when they are operated under short-circuit conditions. The regulator's internal circuitry will
operate at input-to-output differential voltages down to 1V.
Most regulator circuit designs include output capacitors with values in the range of tens to hundreds of microfarads or more. The LX8117/17A/17B typically requires at least 10µF of output capacitance for stable operation.
PNP-type regulators can waste current equal to as much as 10 percent of their output as a quiescent current which flows directly to ground, bypassing the load. Quiescent current from the LX8117/17A/ 17B flows through the load, increasing power-use efficiency and allowing cooler operation.
The LX8117 is available in low-profile plastic SOT-223 and D-Pak packages for applications where space is at a premium. The LX8117 is also available in a plastic TO-263 package for instances when the thermal resistance from the circuit die to the environment must be minimized.
K E Y F E AT U R E S
■0.2% Line Regulation Maximum
■0.4% Load Regulation Maximum
■Output Current Of 800mA
■Regulates Down To 1.2V Dropout (LX8117) And 1.3V Dropout (LX8117A)
■Operates Down To 1V Dropout
■Space Saving SOT-223 Surface Mount Package
■Guaranteed Dropout Voltage At Multiple Current Levels
■Three-Terminal Adjustable Or Fixed 2.5V, 2.85V, 3.3V & 5V
A P P L I C AT I O N S
■Battery Chargers
■Active SCSI Terminators
■5V To 3.3V Linear Regulators
■High-Efficiency Linear Regulators
■Post Regulators For Switching Supplies
AVA I L A B L E OPTIONS P E R PA RT #
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com. |
Part # |
Output |
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Voltage |
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P R O D U C T H I G H L I G H T |
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LX8117/8117A/8117B-00 |
Adjustable |
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ACTIVE TERMINATOR FOR SCSI-2 BUS |
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LX8117/8117A/8117B-25 |
2.5V |
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LX8117/8117A/8117B-28 |
2.85V |
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110Ω |
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LX8117/8117A/8117B-33 |
3.3V |
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LX8117/8117A/8117B-05 |
5V |
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110Ω |
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LX8117-28 |
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110Ω |
18 to 27 |
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IN |
OUT |
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Lines |
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4.75V to |
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GND |
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22µF |
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5.25V |
10µF |
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110Ω |
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PA C K A G E O R D E R I N F O R M AT I O N |
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TA (°C) |
O/P |
ST |
Plastic SOT-223 |
DD Plastic T0-263 |
DT Plastic T0-252 |
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Current |
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3-pin |
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3-pin |
(D-Pak) 3-pin |
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0.8A |
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LX8117-xxCST |
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LX8117-xxCDD |
LX8117-xxCDT |
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0 to 125 |
1.0A |
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LX8117A-xxCST |
LX8117A-xxCDD |
LX8117A-xxCDT |
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1.2A |
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LX8117B-xxCST |
LX8117B-xxCDD |
LX8117B-xxCDT |
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Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number (i.e. LX8117-28CSTT). "xx" refers to output voltage, please see table above.
Copyright © 1999 |
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C . |
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11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 |
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Rev. 1.4 3/99 |
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX8117-xx/8117A-xx/8117B-xx
0.8, 1 & 1.2A L O W DR O P O U T PO S I T I V E RE G U L AT O R S
P R O D U C T I O N D A T A S H E E T
ABSOLUTE MAXIMUM RATINGS |
(Note 1) |
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Power Dissipation .................................................................................. |
Internally Limited |
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Input Voltage |
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LX8117-00/8117A-00/8117B-00 (Adj.) ..................................................................... |
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15V |
LX8117-33/8117A-33/8117B-33 (3.3V), LX8117-05/8117A-05/8117B-05 (5.0V) .... |
15V |
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LX8117-25/8117A-25/8117B-25 (2.5V), LX8117-28/8117A-28/8117B-28 (2.85V) |
.. 12V |
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Surge Voltage ............................................................................................................... |
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15V |
Operating Junction Temperature |
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Plastic (ST, DD & DT Packages) .......................................................................... |
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150°C |
Storage Temperature Range ...................................................................... |
-65°C to 150°C |
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Lead Temperature (Soldering, 10 seconds) ............................................................. |
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300°C |
Short-Circuit Protection ....................................................................................... |
Indefinite |
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Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal.
THERMAL DATA
ST PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB, θJT |
15°C/W |
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA |
*150°C/W |
DD PACKAGE: |
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THERMAL RESISTANCE-JUNCTION TO TAB, θJT |
10°C/W |
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA |
*60°C/W |
DT PACKAGE: |
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THERMAL RESISTANCE-JUNCTION TO TAB, θJC |
9°C/W |
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA |
*80°C/W |
Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
*θJAcan be improved with package soldered to 0.5IN2 copper area over backside ground plane or internal power plane. θJAcan vary from 20ºC/W to > 40ºC/W depending on mounting technique. (See Application Notes Section: Thermal Considerations)
PACKAGE PIN OUTS
TAB IS VOUT
3. IN
2. OUT
1. ADJ / GND
ST PACKAGE
(Top View)
TAB IS VOUT
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IN |
2 |
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OUT |
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1
ADJ / GND
DDPACKAGE (D2 Pak)
(Top View)
TAB IS VOUT
3. IN
2. OUT
1. ADJ / GND
DT PACKAGE (D-Pak)
(Top View)
BLOCK DIAGRAM
VIN
Bias |
Circuit |
Thermal
Limit Circuit
Bandgap |
Circuit |
Control |
Circuit |
Output |
Circuit |
VOUT
ADJ |
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Current |
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Limit Circuit |
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2 |
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Copyright © 1999 |
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Rev. 1.4 3/99 |
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P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
LX8117-xx/8117A-xx/8117B-xx
0.8, 1 & 1.2A L O W DR O P O U T PO S I T I V E RE G U L AT O R S
P R O D U C T I O N D A T A S H E E T
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R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S |
(Note 2) |
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Parameter |
Symbol |
Recommended Operating Conditions |
Units |
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Min. |
Typ. |
Max. |
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Input Voltage |
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Operating Voltage |
LX8117(A/B)-00 / 8117(A/B)-05 |
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15 |
V |
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LX8117(A/B)-25 / -28 / -33 |
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12 |
V |
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Input-Output Differential |
LX8117(A/B)-00 |
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10 |
V |
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Operating Ambient Temperature Range |
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0 |
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125 |
°C |
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Note 2. Range over which the device is functional.
E L E C T R I C A L C H A R A C T E R I S T I C S
(Unless otherwise specified: 0°C ≤ TJ ≤ 125°C, IMAX = 0.8A for the LX8117-xx, IMAX = 1.0A for the LX8117A-xx, and IMAX = 1.2A for the LX8117B-xx.)
LX8117-00 / 8117A-00 / 8117B-00 (Adjustable)
Parameter |
Symbol |
Test Conditions |
LX8117 / 17A / 17B-00 |
Units |
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Min. |
Typ. |
Max. |
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Reference Voltage |
VREF |
IOUT = 10mA, (VIN - VOUT) = 2V, TJ = 25°C |
1.238 |
1.250 |
1.262 |
V |
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10mA ≤ IOUT ≤ IOUT (MAX), 1.4V ≤ (VIN - VOUT) ≤ 10V |
1.225 |
1.250 |
1.270 |
V |
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Line Regulation (Note 3) |
VREF(VIN) |
IOUT = 10mA, 1.5V ≤ (VIN - VOUT) ≤ 7V |
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0.05 |
0.2 |
% |
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Load Regulation |
(Note 3) |
VREF(IOUT) |
(VIN - VOUT) = 3V, 10mA ≤ IOUT ≤ IOUT (MAX) |
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0.15 |
0.4 |
% |
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Dropout Voltage |
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V |
IOUT = 100mA |
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0.97 |
1.10 |
V |
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(Note 4) |
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IOUT = 500mA |
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1.00 |
1.15 |
V |
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LX8117-00 |
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IOUT = IOUT (MAX) |
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1.05 |
1.20 |
V |
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LX8117A/B-00 |
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IOUT = IOUT (MAX) |
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1.15 |
1.30 |
V |
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Current Limit |
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LX8117-00 |
IOUT (MAX) |
(VIN - VOUT) = 5V, TJ = 25°C |
800 |
950 |
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mA |
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LX8117A-00 |
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(VIN - VOUT) = 5V, TJ = 25°C |
1000 |
1200 |
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mA |
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LX8117B-00 |
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(VIN - VOUT) = 5V, TJ = 25°C |
1200 |
1500 |
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mA |
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Minimum Load Current (Note 5) |
IOUT (MIN) |
VIN ≤ 10V |
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0.5 |
5 |
mA |
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Thermal Regulation |
VOUT(Pwr) |
TA = 25°C, 30ms pulse |
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0.08 |
0.2 |
%/W |
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Ripple Rejection |
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fRIPPLE =120Hz, (VIN - VOUT) = 3V, VRIPPLE = 1Vp-p |
60 |
75 |
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dB |
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Adjust Pin Current |
IADJ |
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45 |
100 |
µA |
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Adjust Pin Current Change |
IADJ |
10mA ≤ IOUT ≤ IOUT (MAX) , 1.4V ≤ (VIN - VOUT) ≤ 10V |
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0.2 |
5 |
µA |
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Temperature Stability |
VOUT (T) |
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0.5 |
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% |
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Long Term Stability |
VOUT (t) |
TA = 125°C, 1000 hours |
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0.3 |
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% |
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RMS Output Noise (% of VOUT) |
VOUT (RMS) |
10Hz ≤ f ≤ 10kHz |
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0.003 |
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% |
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Notes: 3. See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured at a constant junction temperature by low duty cycle pulse testing.
4.Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage Curve.
5.Minimum load current is defined as the minimum output current required to maintain regulation.
(Other Voltage Options on following pages.)
Copyright © 1999 |
3 |
Rev. 1.4 3/99 |
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