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LX8117A-25CDT

P1-P3P4-P6P7-P9P10-P11
P RODUCTION D ATA S HEET
T HE I NFINITE P OWER OF I NNOVATION
M ICROSEMI I NC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
Copyright © 2000
Rev. 1.5a,2005-10-25
LX8117-xx / 8117A-xx / 8117B-xx
0.8, 1 & 1.2A LOW DROPOUT POSITIVE REGULATORS
DESCRIPTION
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.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
ACTIVE TERM IN ATO R FO R SCSI-2 B US
110 Ω
110 Ω
110
Ω
110 Ω
22 µF
GND
OUTIN
LX8117-28
10 µF
18 to 27
Lines
4.75V to
5.25V
KEY FEATURES
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
APPLICATIONS
Battery Chargers
Active SCSI Terminators
5V To 3.3V Linear Regulators
High-Efficiency Linear
Regulators
Post Regulators For Switching
Supplies
Available Options Per Part #
Part # Output Voltage
LX8117(x)-25 2.5V
LX8117(x)-28 2.8V
LX8117(x)-33 3.3V
LX8117(x)-05 5V
(x) – denotes O/P Current Setting
PACKAGE ORDER INFO
ST
Plastic SOT-223
3-Pin
DD
Plastic TO-263
3-Pin
DT
Plastic TO-252
(D-Pak) 3-Pin
T
A
(°C)
O/P
Current
RoHS Compliant / Pb-free
Transition DC: 0522
RoHS Compliant / Pb-free
Transition DC: 0535
RoHS Compliant / Pb-free
Transition DC: 0532
0.8A
LX8117-xxCST LX8117-xxCDD LX8117-xxCDT
1.0A
LX8117A-xxCST LX8117A-xxCDD LX8117A-xxCDT
0 to 125
1.2A
LX8117B-xxCST LX8117B-xxCDD LX8117B-xxCDT
Note: Available in Tape & Reel. Append the letter “TR” to the part number. (i.e. LX8117-00CST-TR)
0.8, 1 & 1.2A L OW DROPOUT POSITIVE REGULATORS
LX8117-xx/8117A-xx/8117B-xx
PRODUCT DATABOOK 1996/1997
Copyright © 1999
Rev. 1.5a
2
P
RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Dissipation .................................................................................. Internally Limited
Input Voltage
LX8117-00/8117A-00/8117B-00 (Adj.) ..................................................................... 15V
LX8117-33/8117A-33/8117B-33 (3.3V), LX8117-05/8117A-05/8117B-05 (5.0V) .... 15V
LX8117-25/8117A-25/8117B-25 (2.5V), LX8117-28/8117A-28/8117B-28 (2.85V) .. 12V
Surge Voltage ............................................................................................................... 15V
Operating Junction Temperature
Plastic (ST, DD & DT Packages) .......................................................................... 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C
Short-Circuit Protection ....................................................................................... Indefinite
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.
PACKAGE PIN OUTS
3. IN
2. OUT
1. ADJ / GND
ST PACKAGE
(Top View)
3
2
1
DD PACKAGE (D
2
Pak)
(Top View)
THERMAL DATA
TAB IS V
OUT
ST PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
θθ
θθ
θ
JT
15°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θθ
θθ
θ
JA
*150°C/W
DD PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
θθ
θθ
θ
JT
10°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θθ
θθ
θ
JA
*60°C/W
DT PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
θθ
θθ
θ
JC
9°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θθ
θθ
θ
JA
*80°C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x θ
JA
). The θ
JA
numbers are guidelines for the
thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
* θ
JA
can be improved with package soldered to 0.5IN
2
copper area over backside ground
plane or internal power plane. θ
JA
can vary from 20ºC/W to > 40ºC/W depending on
mounting technique. (See Application Notes Section: Thermal Considerations)
TAB IS V
OUT
BLOCK DIAGRAM
Thermal
Limit Circuit
Control
Circuit
Bandgap
Circuit
Output
Circuit
Bias
Circuit
V
OUT
V
IN
Current
Limit Circuit
ADJ
3. IN
2. OUT
1. ADJ / GND
DT PACKAGE (D-Pak)
(Top View)
TAB IS V
OUT
IN
OUT
ADJ / GND
RoHS Peak Package Solder Reflow Temp. (40 seconds max. exposure)............................ 260°C (+0, -5)
RoHS / Pb-free 100% Matte Tin Lead Finish
0.8, 1 & 1.2A L OW DROPOUT POSITIVE REGULATORS
LX8117-xx/8117A-xx/8117B-xx
PRODUCT DATABOOK 1996/1997
3
Copyright © 1999
Rev. 1.5a
P RODUCTION DATA SHEET
Input Voltage
Operating Voltage LX8117(A/B)-00 / 8117(A/B)-05
LX8117(A/B)-25 / -28 / -33
Input-Output Differential LX8117(A/B)-00
Operating Ambient Temperature Range
RECOMMENDED OPERATING CONDITIONS (Note 2)
Parameter
Symbol
Units
Recommended Operating Conditions
Min. Typ. Max.
15 V
12 V
10 V
0 125 °C
Note 2. Range over which the device is functional.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified: 0°C ≤ T
J
≤ 125°C, I
MAX
= 0.8A for the LX8117-xx, I
MAX
= 1.0A for the LX8117A-xx, and I
MAX
= 1.2A for the LX8117B-xx.)
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.
Parameter
Symbol
Test Conditions Units
LX8117 / 17A / 17B-00
Min. Typ. Max.
Reference Voltage V
REF
I
OUT
= 10mA, (V
IN
- V
OUT
) = 2V, T
J
= 25°C
10mA ≤ I
OUT
≤ I
OUT (MAX)
, 1.4V ≤ (V
IN
- V
OUT
) ≤ 10V
Line Regulation (Note 3)
∆V
REF
(V
IN
)
I
OUT
= 10mA, 1.5V ≤ (V
IN
- V
OUT
) ≤ 7V
Load Regulation (Note 3)
∆V
REF
(I
OUT
)
(V
IN
- V
OUT
) = 3V, 10mA ≤ I
OUT
≤ I
OUT (MAX)
Dropout Voltage ∆VI
OUT
= 100mA
(Note 4)
I
OUT
= 500mA
LX8117-00 I
OUT
= I
OUT (MAX)
LX8117A/B-00 I
OUT
= I
OUT (MAX)
Current Limit LX8117-00 I
OUT (MAX)
(V
IN
- V
OUT
) = 5V, T
J
= 25°C
LX8117A-00 (V
IN
- V
OUT
) = 5V, T
J
= 25°C
LX8117B-00 (V
IN
- V
OUT
) = 5V, T
J
= 25°C
Minimum Load Current (Note 5) I
OUT (MIN)
V
IN
≤ 10V
Thermal Regulation
∆V
OUT
(Pwr)
T
A
= 25°C, 30ms pulse
Ripple Rejection f
RIPPLE
=120Hz, (V
IN
- V
OUT
) = 3V, V
RIPPLE
= 1Vp-p
Adjust Pin Current I
ADJ
Adjust Pin Current Change ∆I
ADJ
10mA ≤ I
OUT
≤ I
OUT (MAX)
, 1.4V ≤ (V
IN
- V
OUT
) ≤ 10V
Temperature Stability ∆V
OUT
(T)
Long Term Stability ∆V
OUT
(t) T
A
= 125°C, 1000 hours
RMS Output Noise (% of V
OUT
)V
OUT (RMS)
10Hz ≤ f ≤ 10kHz
1.238 1.250 1.262 V
1.225 1.250 1.270 V
0.05 0.2 %
0.15 0.4 %
0.97 1.10 V
1.00 1.15 V
1.05 1.20 V
1.15 1.30 V
800 950 mA
1000 1200 mA
1200 1500 mA
0.5 5 mA
0.08 0.2 %/W
60 75 dB
45 100 µA
0.2 5 µA
0.5 %
0.3 %
0.003 %
LX8117-00 / 8117A-00 / 8117B-00 (Adjustable)
(Other Voltage Options on following pages.)
P1-P3P4-P6P7-P9P10-P11

LX8117A-25CDT

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Buy LX8117A-25CDT
Manufacturer:
Microchip / Microsemi
Description:
IC REG LINEAR 2.5V 1A TO252
Lifecycle:
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