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PDF LX8117-25CDT Data sheet ( Hoja de datos )
| Número de pieza | LX8117-25CDT | |
| Descripción | 0.8/ 1 & 1.2A LOW DROPOUT POSITIVE REGULATORS | |
| Fabricantes | Microsemi Corporation | |
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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 VAT I O N
L I N D O C #: 8117
LX8117-xx/8117A-xx/8117B-xx
0.8, 1 & 1.2A L OW DR O P O U T PO S I T I V E RE G U L AT O R S
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The LX8117/8117A/8117B series are
positive Low Dropout (LDO) regulators.
At the designed maximum load current,
the LX8117 series dropout voltage is guar-
anteed 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 capaci-
tance 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.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
ACTIVE TERMINATOR FOR SCSI-2 BUS
4.75V to
5.25V
LX8117-28
IN OUT
GND
10µF
22µF
110Ω
110Ω
110Ω
18 to 27
Lines
110Ω
KEY FEATURES
s 0.2% Line Regulation Maximum
s 0.4% Load Regulation Maximum
s Output Current Of 800mA
s Regulates Down To 1.2V Dropout
(LX8117) And 1.3V Dropout (LX8117A)
s Operates Down To 1V Dropout
s Space Saving SOT-223 Surface
Mount Package
s Guaranteed Dropout Voltage At Multiple
Current Levels
s Three-Terminal Adjustable Or Fixed 2.5V,
2.85V, 3.3V & 5V
A P P L I C AT I O N S
s Battery Chargers
s Active SCSI Terminators
s 5V To 3.3V Linear Regulators
s High-Efficiency Linear Regulators
s Post Regulators For Switching Supplies
A VA I L A B L E O PTIONS P E R P A RT #
Part #
Output
Voltage
LX8117/8117A/8117B-00 Adjustable
LX8117/8117A/8117B-25 2.5V
LX8117/8117A/8117B-28 2.85V
LX8117/8117A/8117B-33 3.3V
LX8117/8117A/8117B-05
5V
Copyright © 1999
Rev. 1.4 3/99
PACKAGE ORDER INFORMATION
TA (°C)
O/P
Current
ST
Plastic
3-pin
SOT-223
DD
Plastic
3-pin
T0-263
DT
Plastic T0-252
(D-Pak) 3-pin
0.8A
LX8117-xxCST
LX8117-xxCDD
LX8117-xxCDT
0 to 125
1.0A
LX8117A-xxCST
LX8117A-xxCDD
LX8117A-xxCDT
1.2A
LX8117B-xxCST
LX8117B-xxCDD
LX8117B-xxCDT
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.
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
1 page  
PRODUCT DATABOOK 1996/1997
LX8117-xx/8117A-xx/8117B-xx
0.8, 1 & 1.2A L OW DR O P O U T PO S I T I V E RE G U L AT O R S
PR O D U C T I O N D ATA S H E E T
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 (continued)
LX8117-33 / 8117A-33 / 8117B-33 (3.3V Fixed)
Parameter
Symbol
Test Conditions
Output Voltage
Line Regulation (Note 3)
Load Regulation (Note 3)
Dropout Voltage
(Note 4)
LX8117-33
LX8117A/B-33
Current Limit
LX8117-33
LX8117A-33
LX8117B-33
Quiescent Current
Thermal Regulation
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise (% of VOUT)
VOUT IOUT = 10mA, VIN = 5V, TA = 25°C
0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V
∆VOUT(VIN) IOUT = 0mA, 4.25V ≤ VIN ≤ 10V
∆VOUT (IOUT) VIN = 4.25V, 0mA ≤ IOUT ≤ IOUT (MAX)
∆V IOUT = 100mA
IOUT = 500mA
IOUT = IOUT (MAX)
IOUT = IOUT (MAX)
IOUT (MAX) (VIN - VOUT) = 5V, TJ = 25°C
(VIN - VOUT) = 5V, TJ = 25°C
(VIN - VOUT) = 5V, TJ = 25°C
IQ VIN ≤ 10V
∆VOUT(Pwr) TA = 25°C, 30ms pulse
fRIPPLE =120Hz, (VIN - VOUT) = 3V, VRIPPLE = 1Vp-p
∆VOUT (T)
∆VOUT (t) TA = 125°C, 1000 hours
VOUT (RMS) 10Hz ≤ f ≤ 10kHz
LX8117 / 17A / 17B-33
Min. Typ. Max.
3.267 3.300 3.333
3.235 3.300 3.365
16
2 10
0.97 1.10
1.00 1.15
1.05 1.20
1.15 1.30
800 950
1000 1200
1200 1500
4.5 10
0.08 0.2
60 75
0.5
0.3
0.003
Units
V
V
mV
mV
V
V
V
V
mA
mA
mA
mA
%/W
dB
%
%
%
LX8117-05 / 8117A-05 / 8117B-05 (5.0V Fixed)
Parameter
Symbol
Test Conditions
LX8117 / 17A / 17B-05 Units
Min. Typ. Max.
Output Voltage
Line Regulation (Note 3)
Load Regulation (Note 3)
Dropout Voltage
(Note 4)
LX8117-05
LX8117A/B-05
Current Limit
LX8117-05
LX8117A-05
LX8117B-05
Quiescent Current
Thermal Regulation
Ripple Rejection
Temperature Stability
Long Term Stability
RMS Output Noise (% of VOUT)
VOUT IOUT = 10mA, VIN = 7V, TA = 25°C
0mA ≤ IOUT ≤ IOUT (MAX) , 6.50V ≤ VIN ≤ 10V
∆VOUT(VIN) IOUT = 0mA, 6.5V ≤ VIN ≤ 10V
∆VOUT (IOUT) VIN = 6.5V, 0mA ≤ IOUT ≤ IOUT (MAX)
∆V IOUT = 100mA
IOUT = 500mA
IOUT = IOUT (MAX)
IOUT = IOUT (MAX)
IOUT (MAX) (VIN - VOUT) = 5V, TJ = 25°C
(VIN - VOUT) = 5V, TJ = 25°C
(VIN - VOUT) = 5V, TJ = 25°C
IQ VIN ≤ 10V
∆VOUT(Pwr) TA = 25°C, 30ms pulse
fRIPPLE =120Hz, (VIN - VOUT) = 3V, VRIPPLE = 1Vp-p
∆VOUT (T)
∆VOUT (t) TA = 125°C, 1000 hours
VOUT (RMS) 10Hz ≤ f ≤ 10kHz
4.950
4.900
800
1000
1200
60
5.000
5.000
1
2.5
0.97
1.00
1.05
1.15
950
1200
1500
4.5
0.08
75
0.5
0.3
0.003
5.050
5.100
10
15
1.10
1.15
1.20
1.30
10
0.2
V
V
mV
mV
V
V
V
V
mA
mA
mA
mA
%/W
dB
%
%
%
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.
Copyright © 1999
Rev. 1.4 3/99
5
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