The LD1117 is aLOW DROP Voltage Regulator
able to provide up to 800mA of Output Current,
availableeveninadjustableversion
(V
=1.25V). Concerning fixed versions, are
ref
offered the following Output Voltages: 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, DPAK, SO-8
and TO-220. The SOT-223 and DPAK surface
mountpackagesoptimizethethermal
characteristics even offering a relevant space
saving effect. High efficency is assured by NPN
o
C) AND2% IN
o
C TO 125oC
SERIES
SO-8SOT-223
TO-252 (DPAK)TO-220
pass transistor. In fact in this 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%
o
at 25
pincompatiblewiththeotherstandard
Adjustable voltage regulators maintaining the
better performances in terms of Drop and
Tolerance.
C. The ADJUSTABLE LD1117 is pin to
BLOCKDIAGRAM
June 2002
1/18
Page 2
LD1117 SERIES
ABSOLUTE MAXIMUM RATINGS
SymbolParameterValueUnit
V
DC InputVoltage15V
IN
P
PowerDissipation12W
tot
T
Absolute Maximum Ratings are those value beyond which damage to the device may occur. Functional operation under these condition is
not implied. Over the above suggested Max Power Dissipation a Short Circuit could definetively damage the device.
ELECTRICAL CHARACTERISTICS FOR LD1117#30C(referto the test circuits,
= 0 to 125oC, Co=10µF unless otherwisespecified)
T
j
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
OutputVoltageVin=5V Io=10mA Tj=25oC2.9433.06V
o
V
OutputVoltageIo=0 to 800mA Vin=4.5to10V2.883.12V
o
V
LineRegulationVin=4.5to 12 V Io= 0 mA130mV
∆
o
∆V
LoadRegulationVin=4.5V Io=0 to800 mA130mV
o
∆V
Temperature Stability0.5%
o
∆V
LongTermStability1000hrs Tj= 125oC0.3%
o
V
OperatingInput VoltageIo=100mA15V
in
I
QuiescentCurrentV
d
I
OutputCurrentVin=8V Tj=25oC8009501300mA
o
eNOutputNoise VoltageB = 10Hz to 10KHz T
SVRSupply Voltage RejectionI
Dropout VoltageIo=100mA
V
d
Thermal RegulationT
12 V510mA
≤
in
=25oC100
j
=40 mA f = 120 Hz Tj=25oC
o
=6V V
V
in
I
=500mA
o
=800mA
I
o
=25oC 30ms Pulse0.010.1%/W
a
ripple
=1 Vpp
6075dB
1
1.05
1.1
1.1
1.15
1.2
V
µ
V
V
V
V
µ
V
V
V
8/18
Page 9
LD1117 SERIES
ELECTRICAL CHARACTERISTICS FOR LD1117#33C(referto the test circuits,
= 0 to 125oC, Co=10µF unless otherwisespecified)
T
j
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
OutputVoltageVin=5.3V Io=10 mA Tj=25oC3.243.33.36V
o
V
OutputVoltageIo=0 to 800mA Vin=4.75to10V3.163.44V
o
V
LineRegulationVin=4.75to 15 V Io=0 mA130mV
∆
o
V
LoadRegulationVin=4.75V Io= 0 to 800 mA130mV
∆
o
V
Temperature Stability0.5%
∆
o
∆V
LongTermStability1000hrs Tj= 125oC0.3%
o
V
OperatingInput VoltageIo=100mA15V
in
I
QuiescentCurrentV
d
I
OutputCurrentVin=8.3V Tj=25oC8009501300mA
o
eNOutputNoise VoltageB = 10Hz to 10KHz T
SVRSupply Voltage RejectionI
Dropout VoltageIo=100mA
V
d
Thermal RegulationT
15 V510mA
≤
in
=25oC100
j
=40 mA f = 120 Hz Tj=25oC
o
=6.3V V
V
in
=500mA
I
o
=800mA
I
o
=25oC 30ms Pulse0.010.1%/W
a
ripple
= 1 Vpp
6075dB
1
1.05
1.1
1.1
1.15
1.2
V
µ
V
V
V
ELECTRICAL CHARACTERISTICS FOR LD1117#50C(referto the test circuits,
= 0 to 125oC, Co=10µF unless otherwisespecified)
T
j
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
OutputVoltageVin=7V Io=10mA Tj=25oC 4.955.1V
o
V
OutputVoltageIo=0 to 800mA Vin=6.5to15V4.85.2V
o
V
LineRegulationVin=6.5to 15 V Io= 0 mA150mV
∆
o
∆V
LoadRegulationVin=6.5V Io=0 to800 mA150mV
o
∆V
Temperature Stability0.5%
o
∆V
LongTermStability1000hrs Tj= 125oC0.3%
o
V
OperatingInput VoltageIo=100mA15V
in
I
QuiescentCurrentV
d
I
OutputCurrentVin=10V Tj=25oC8009501300mA
o
eNOutputNoise VoltageB = 10Hz to 10KHz T
SVRSupply Voltage RejectionI
Dropout VoltageIo=100mA
V
d
Thermal RegulationT
15 V510mA
≤
in
=25oC100
j
=40 mA f = 120 Hz Tj=25oC
o
=8V V
V
in
I
=500mA
o
=800mA
I
o
=25oC 30ms Pulse0.010.1%/W
a
ripple
=1 Vpp
6075dB
1
1.05
1.1
1.1
1.15
1.2
V
µ
V
V
V
9/18
Page 10
LD1117 SERIES
TYPICALAPPLICATIONS:
FIGURE1: Negative Supply
FIGURE2:
FIGURE3:
ActiveTerminatorfor SCSI-2 BUS
Circuit for IncreasingOutput Voltage
10/18
Page 11
LD1117 SERIES
TYPICALAPPLICATIONS
(continued)
:
FIGURE4: Voltage RegulatorWith Reference
FIGURE5:
Battery Backed-upRegulatedSupply
11/18
Page 12
LD1117 SERIES
TYPICALAPPLICATIONS
(continued)
FIGURE6: Post-Regulated Dual Supply
:
12/18
Page 13
LD1117 SERIES
LD1117ADJUSTABLE: APPLICATIONNOTE
The LD1117 ADJUSTABLE has a thermal stabilized 1.25±0.012V reference voltage between the
OUT and ADJ pins. I
R1 is normally fixed to 120Ω. From figure 7 we obtain:
V
OUT=VREF
+R2(I
In normal application R2 value is in the range of few Kohm, so the R2 x I
considered in the V
V
OUT=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 electrolitic capacitor placed in parallel to the R2 resistor (see
Fig.8)
FIGURE7: Adjustable Output Voltage Application Circuit
is 60µA typ. (120µA max.) and ∆I
ADJ
ADJ+IR1
OUT
)=V
REF+R2(IADJ+VREF
calculation; then the above expression becomes:
is 1µA typ. (5µA max.).
ADJ
/R1)=V
(1 + R2 / R1) + R2 x I
REF
product could not be
DJ
ADJ
.
FIGURE8: Adjustable Output Voltage Application with improved Ripple Rejection
Information furnished isbelieved to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject tochange without notice. Thispublication supersedes andreplaces all informationpreviously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems withoutexpress written approval of STMicroelectronics.
The ST logo is a registeredtrademark of STMicroelectronics
2002 STMicroelectronics – Printed in Italy – All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil-China - Finland - France - Germany - Hong Kong - India - Italy - Japan- Malaysia - Malta - Morocco
Singapore - Spain- Sweden - Switzerland - United Kingdom - U.S.A.
http://www.st.com
.
18/18
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