The LD1117 is a LOW DROP Voltage Regulator
able to provide up to 800mA of Output Current,
available even in adjustable version (Vref=1.25V).
Concerning fixed versions, are offered the
following Output Voltages: 1.2V,1.8V,2.5V,2.85V,
3.0V 3.3V and 5.0V. The 2.85V t yp e is ideal for
SCSI-2 lines active termination. The device is
supplied in: SOT-223, DP AK, SO-8, TO-220 and
TO-220FM. The SOT-223 and DPAK surface
mount packages optimize the thermal
characteristics even offering a relevant space
saving effect. High efficiency is assured by NP N
TO-220FM
SOT-223DPAK
TO-220
SO-8
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 t rimmi ng
allows the regulator to reach a very tight output
voltage tolerance, within ± 1% at 25°C. The
ADJUSTABLE LD1117 is pin to pin compatible
with the other standard. Adjustable voltage
regulators maintaining the bette r performances i n
terms of Drop and Tolerance.
Figure 1: Block Diagram
Rev. 16
1/28October 2004
LD1117 SERIES
Figure 2: Pin Connec t ion (top view)
SOT-223SO-8
TO-220FM
TO-220
DPAK
NOTE: The T AB is connect ed to the V
OUT
.
Table 1: Order Codes
SOT-223SO-8DPAKTO-220TO-220FM
LD1117S1 2LD1117D12 (*)LD1117DT1 2LD1117V12 (*)LD1117F12 (*)1.2 V
LD1117S12C (*)LD1117D12C (*)LD1117DT12CLD1117V12C (*)LD1117F12C (*)1.2 V
LD1117S18LD1117D18LD1117DT18LD1117V18LD1117F181.8 V
LD1117S18CLD1117D18CLD1117DT18CLD1117V18CLD1117F18C1.8 V
LD1117S25LD1117D25LD1117DT25LD1117V25LD1117F252.5 V
LD1117S25CLD1117D25CLD1117DT25CLD1117V25CLD1117F25C2.5 V
LD1117S28LD1117D28LD1117DT28LD1117V28LD1117F282.85 V
LD1117S30LD1117D30LD1117DT30LD1117V30LD1117F303 V
LD1117S30CLD1117D30CLD1117DT30CLD1117V30CLD1117F30C3 V
LD1117S33LD1117D33LD1117DT33LD1117V33LD1117F333.3 V
LD1117S33CLD1117D33CLD1117DT33CLD1117V33CLD1117F33C3.3 V
LD1117S50LD1117D50LD1117DT50LD1117V50LD1117F505 V
LD1117S50CLD1117D50CLD1117DT50CLD1117V50CLD1117F50C5 V
LD1117SLD1117DLD1117DTLD1117VLD1117FADJ FROM 1.25
LD1117SCLD1117DCLD1117DTCLD1117VCLD1117FCADJ FROM 1.25
OUTPUT
VOLTAGE
TO 15V
TO 15V
(*) Avai l abl e on request
2/28
LD1117 SERIES
Table 2: Absolute Maximum Ratings
SymbolParameterValueUnit
V
P
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not impl i ed. Over the abov e suggeste d M ax Power Dis si pation a Sho rt Circuit could defini tively dama ge the device.
Table 3: Thermal Data
SymbolParameterSOT-223SO-8DPAKTO-220TO-220FMUnit
R
thj-case
R
thj-amb
Figure 3: Applica t i on Circuit (FOR 1.2 V)
DC Input Voltage
IN
Power Dissipation
tot
Storage Temperature Range
stg
Operating Junction Temperature Rangefor C Version-40 to +125°C
Output VoltageIO = 0 to 800 mAVin = 6.5 to 15 V4.85.2V
O
∆V
∆V
∆V
∆V
SVRSupply Voltage RejectionI
Line RegulationVin = 6.5 to 15 VIO = 0 mA150mV
O
Load RegulationVin = 6.5 VIO = 0 to 800 mA150mV
O
Temperature Stability0.5%
O
Long Term Stability1000 hrs, TJ = 125°C0.3%
O
Operating Input VoltageIO = 100 mA15V
V
in
Quiescent CurrentVin ≤ 15 V510mA
I
d
Output CurrentVin = 10 V TJ = 25°C8009501300mA
I
O
eNOutput Noise VoltageB =10Hz to 10KHzT
= 40 mA f = 120HzTJ = 25°C
O
V
= 8 VV
in
V
Dropout VoltageIO = 100 mA TJ = 0 to 125°C11.1V
d
= 500 mA TJ = 0 to 125°C1.051.15
I
O
= 800 mA TJ = 0 to 125°C1.101.2
I
O
Dropout VoltageIO = 100 mA1.1V
V
d
I
= 500 mA1.2
O
= 800 mA1.3
I
O
Thermal RegulationT
= 25°C 30ms Pulse0.010.1%/W
a
ripple
= 25°C100µV
J
6075dB
= 1 V
PP
13/28
LD1117 SERIES
Table 18: Electrical Characteristics Of LD1117C (ADJUSTABLE) (refer to the test circuits,
T
= -40 to 125°C, CO = 10 µF unless otherwise specified)
J
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
Reference VoltageVin - VO = 2 V IO = 10 mA TJ =
ref
25°C
Reference VoltageIO = 10 to 800 mAVin - VO= 1.4 to 10 V1.21.3V
V
ref
1.2251.251.275V
∆V
∆V
∆V
∆V
∆I
I
O(min)
Line RegulationVin - VO = 1.5 to 13.75 VIO = 10 mA1%
O
Load RegulationVin - VO = 3 VIO = 10 to 800 mA1%
O
Temperature Stability0.5%
O
Long Term Stability1000 hrs, TJ = 125°C0.3%
O
Operating Input Voltage15V
V
in
Adjustment Pin CurrentVin ≤ 15 V60120µA
I
adj
Adjustment Pin Current
adj
Change
Minimum Load CurrentVin = 15 V25mA
I
Output CurrentVin - VO = 5 VTJ = 25°C8009501300mA
O
eNOutput Noise (%V
)B =10Hz to 10KHzTJ = 25°C0.003%
O
SVRSupply Voltage RejectionI
V
Dropout VoltageIO = 100 mATJ = 0 to 125°C11.1V
d
Dropout VoltageIO = 100 mA1.1V
V
d
Thermal RegulationT
Vin - VO = 1.4 to 10 V
I
= 10 to 800 mA
O
= 40 mA f = 120HzTJ = 25°C
O
V
- VO = 3 VV
in
= 500 mATJ = 0 to 125°C1.051.15
I
O
I
= 800 mATJ = 0 to 125°C1.101.2
O
= 500 mA1.2
I
O
= 800 mA1.3
I
O
= 25°C 30ms Pulse0.010.1%/W
a
ripple
= 1 V
PP
6075dB
110µA
TYPICAL APPLICATIONS
Figure 5: Negativ e Supply
14/28
Figure 6: Active Terminator for SCSI-2 BUS
Figure 7: Circuit for Increasing Output Voltage
LD1117 SERIES
Figure 8: Voltage Regulator With Reference
15/28
LD1117 SERIES
Figure 9: Battery Backed-up Regulated Supply
16/28
Figure 10: Post-Regulated Dual Supply
LD1117 SERIES
LD1117 ADJUSTABLE: APPLICATION NOTE
The LD1117 ADJUSTABLE has a thermal
stabilized 1.25±0.012V reference voltage between
the OUT and ADJ pins. I
max.) and ∆I
is 1µA typ. (5µA max.).
ADJ
is 60µA ty p. (120µA
ADJ
R1 is normally fixed to 120Ω. From figure 7 we
obtain:
V
+V
OUT
REF
= V
/R1) = V
REF
+ R2 (I
REF
+IR1) = V
ADJ
(1 + R2 / R1) + R2 x I
REF
+ R2 (I
ADJ
ADJ
.
In normal application R2 value is in the range of
few kohm, so the R2 x I
considered in the V
product could not be
DJ
calculation; then the
OUT
above expres s ion becom es:
V
OUT
= V
(1 + R2 / R1).
REF
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 con nection
must be realized very close to OUT and A DJ pin,
while R2 ground connection must be placed as
near as poss ible to the ne gative Loa d pin. Rippl e
rejection can be improv ed by introducing a 10µF
electrolytic capacitor placed in parallel to the R2
resistor (see Fig.8).
17/28
LD1117 SERIES
Figure 11: Adjustable Output Voltage Application
Figu re 12: Adjust a b le Output Vo ltage A p plica t ion with imp r oved R ipple Rejec tion
22-Sep-200415.0Add new Part Number #12C; Typing Error: Note on table 2.
25-Oct-200416.0
Add V
Reference Voltage on Table 12.
ref
LD1117 SERIES
27/28
LD1117 SERIES
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