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PDF UTCLD1117A Data sheet ( Hoja de datos )
| Número de pieza | UTCLD1117A | |
| Descripción | LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UTCLD1117/A LINEAR INTEGRATED CIRCUIT
LOW DROP FIXED AND
ADJUSTABLE POSITIVE VOLTAGE
REGULATORS
321
www.DataSheet4U.com
DESCRIPTION
The UTC LD1117/A is a LOW DROP Voltage Regulator
able to provide up to 0.8/1.0A of Output Current, available
even in adjustable version (Vref=1.25V). Concerning fixed
versions, are offered the following Output Voltages: 1.8V,
2.5V, 2.85V, 3.0V, 3.3V and 5.0V. The 2.85V type is ideal for
SCSI-2 lines active termination. The device is supplied in:
SOT-223, TO-252, TO-263, TO-263-3, SOP-8 and TO-220.
The SOT-223, TO-263, TO-263-3 and TO-252 surface mount
packages optimize the thermal characteristics even offering a
relevant space saving effect. High efficiency is assured by
NPN pass transistor. In fact in the case, unlike than PNP one,
the Quiescent Current flows mostly into the load. Only a very
common 10µF minimum capacitor is needed for stability. On
chip trimming allows the regulator to reach a very tight output
voltage tolerance, within ±1% at 25°C. The ADJUSTABLE
LD1117/A is pin to pin compatible with the other standard
Adjustable voltage regulators maintaining the better
performances in terms of Drop and Tolerance.
FEATURES
*Low dropout voltage (1V Typ.)
*2.85V device performances are suitable for SCSI-2 active
termination
*Output current up to 0.8/1.0A
*Fixed output voltage of: 1.8V,2.5V, 2,85V, 3.0V, 3.3V, 5.0V
*Adjustable version availability (Vref=1.25V)
*Internal current and thermal limit
*Available in ±1%(at 25°C) and 2% in all temperature range
*Supply voltage rejection: 75dB (TYP)
*Temperature range: 0°C to 125°C
SOT-223
SOP-8
1
TO-220
1
TO-252
11
TO-263
TO-263-3
SOP-8
1: GND; 2,3,6,7: Vout;
4: Vin; 5,8: NC
UTC
UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R102-006,H
1 page  
www.DataSheet4U.com
UTCLD1117/A LINEAR INTEGRATED CIRCUIT
PARAMETER
Output Noise Voltage
Supply Voltage
Rejection
Dropout Voltage
Thermal Regulation
SYMBOL
TEST CONDITIONS
eN B=10Hz to 10KHz, Tj=25°C
SVR Io=40mA, f=120Hz, Tj=25°C, Vin=5.5V,
Vripple=1Vpp
Vd Io=100mA
Io=500mA
Io=800mA
Io=1000mA
Ta=25°C, 30ms Pulse
MIN.
60
TYP.
100
75
1.00
1.05
1.10
1.15
0.01
MAX.
1.10
1.15
1.20
1.25
0.10
UNIT
µV
dB
V
V
V
V
%/W
UTC LD1117/A-2.85 ELECTRICAL CHARACTERISTICS
(refer to the test circuits, Tj=0 to 125°C, Co=10µF unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
Output Voltage
Vo Vin=4.85V, Io=10mA, Tj=25°C
2.82
Output Voltage
Vo Io=0 to 800/1000mA,Vin=4.25 to 10V 2.79
Line Regulation
∆Vo Vin=4.25 to 10V, Io=0mA
Load Regulation
∆Vo Vin=4.25V, Io=0 to 800/1000mA
Temperature stability
∆Vo
Long Term Stability
∆Vo 1000 hrs, Tj=125°C
Operating Input Voltage
Vin Io=100mA
Quiescent Current
Id Vin≤10V
Output Current
Io Vin=7.85V, Tj=25°C
800
Output Noise Voltage
eN B=10Hz to 10KHz, Tj=25°C
Supply Voltage
SVR Io=40mA, f=120Hz, Tj=25°C, Vin=5.85V, 60
Rejection
Vripple=1Vpp
Dropout Voltage
Vd Io=100mA
Io=500mA
Io=800mA
Io=1000mA
Thermal Regulation
Ta=25°C, 30ms Pulse
TYP.
2.85
1
1
0.5
0.3
5
950
100
75
1.00
1.05
1.10
1.15
0.01
MAX.
2.88
2.91
6
10
15
10
1200
1.10
1.15
1.20
1.25
0.10
UNIT
V
V
mV
mV
%
%
V
mA
mA
µV
DB
V
V
V
V
%/W
UTC LD1117/A-3.0 ELECTRICAL CHARACTERISTICS
(refer to the test circuits, Tj=0 to 125°C, Co=10µF unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
Output Voltage
Vo Vin=5V, Io=10mA, Tj=25°C
±1%
±2%
Output Voltage
Vo Io=0 to 800/1000mA,
Vin=4.5 to 10V
±2%
±4%
Line Regulation
∆Vo Vin=4.5 to 12V, Io=0mA
Load Regulation
∆Vo Vin=4.5V, Io=0 to 800/1000mA
Temperature stability
∆Vo
Long Term Stability
∆Vo 1000 hrs, Tj=125°C
Operating Input Voltage
Vin Io=100mA
Quiescent Current
Id Vin≤12V
Output Current
Io Vin=8V, Tj=25°C
Output Noise Voltage
eN B=10Hz to 10KHz, Tj=25°C
Supply Voltage
SVR Io=40mA, f=120Hz, Tj=25°C, Vin=6V,
Rejection
Vripple=1Vpp
MIN.
2.97
2.94
2.94
2.88
800
60
TYP.
3.00
3.00
1
1
0.5
0.3
5
950
100
75
MAX.
3.03
3.06
3.06
3.12
6
10
15
10
1200
UNIT
V
V
V
V
mV
mV
%
%
V
mA
mA
µV
dB
UTC
UNISONIC TECHNOLOGIES CO., LTD. 5
QW-R102-006,H
5 Page 
UTCLD1117/A LINEAR INTEGRATED CIRCUIT
www.DataSheet4U.com
LD1117/A ADJUSTABLE APPLICATION NOTE
The LD1117/A ADJUSTABLE has a thermal stabilized 1.25±0.012V reference voltage between the OUT and ADJ
pins. IADJ is 60µA typ. (120µA max.) and ∆IADJ is 1µA typ. (5µA max.).
R1 is normally fixed to 120Ω. From figure 7 we obtain:
VOUT=VREF+R2(IADJ + IR1)=VREF + R2(IADJ + VREF / R1)=VREF(1+R2/R1) + R2 x IADJ.
In normal application R2 value is in the range of few Kohm,, so the R2 X IADJ product could not be considered in the
VOUT calculation; then the above expression becomes: VOUT=VREF(1+R2/R1)
In order to have the better load regulation it is important to realize a good Kelvin connection of R1 and R2 resistors.
In particular R1 connection must be realized very close to OUT and ADJ pin, while R2 ground connection must be
placed as near as possible to the negative Load pin. Ripple rejection can be improved by introducing a 10µF
electrolytic capacitor placed in parallel to the R2 resistor (See Fig. 8)
FIG.7 Adjustable Output Voltage Application Circuit
FIG.8 Adjustable Output Voltage Application with improved Ripple Rejection.
UTC
UNISONIC TECHNOLOGIES CO., LTD. 11
QW-R102-006,H
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet UTCLD1117A.PDF ] | |
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