STMicroelectronics LD1117xx Technical data
Low drop fixed and adjustable positive voltage regulators
Features
■ Low dropout voltage (1 V typ.)
■ 2.85 V Device performances are suitable for
SCSI-2 active termination
■ Output current up to 800 mA
■ Fixed output voltage of: 1.2 V, 1.8 V, 2.5 V,
2.85 V, 3.0 V, 3.3 V, 5.0 V
■ Adjustable version availability (V
■ Internal current and thermal limit
■ Available in ± 1% (at 25 °C) and 2% in full
temperature range
■ Supply voltage rejection: 75 dB (typ.)
Description
The LD1117 is a LOW DROP Voltage Regulator
able to provide up to 800 mA of Output Current,
available even in adjustable version (V
Concerning fixed versions, are offered the
following Output Voltages: 1.2 V, 1.8 V, 2.5 V, 2.85
V, 3.0 V, 3.3 V and 5.0 V. The 2.85 V 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 mount packages
optimize the thermal characteristics even offering
a relevant space saving effect.
= 1.25 V)
ref
=1.25 V).
ref
LD1117xx
DPAK
TO-220
SOT-223
High efficiency is assured by NPN 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% at 25°C. The
ADJUSTABLE LD1117 is pin to pin compatible
with the other standard. Adjustable voltage
regulators maintaining the better performances in
terms of drop and tolerance.
SO-8
Table 1. Device summary
Part numbers
LD1117XX12 LD1117XX25C LD1117XX50
LD1117XX12C LD1117XX28 LD1117XX50C
LD1117XX18 LD1117XX30 LD1117XX
LD1117XX18C LD1117XX33 LD1117XXC
LD1117XX25 LD1117XX33C
November 2007 Rev 22 1/41
www.st.com
41
Contents LD1117xx
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7 LD1117 adjustable: application note . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2/41
LD1117xx List of figures
List of figures
Figure 2. Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Application circuit (for 1.2 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. Application circuit (for other fixed output voltages) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Negative supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 6. Active terminator for SCSI-2 BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 7. Circuit for increasing output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 8. Voltage regulator with reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 9. Battery backed-up regulated supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 10. Post-regulated dual supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 11. Adjustable output voltage application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 12. Adjustable output voltage application with improved ripple rejection . . . . . . . . . . . . . . . . . 26
Figure 13. Drawing dimension DPAK (type STD-ST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 14. Drawing dimension DPAK (type FUJITSU-SUBCON.). . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 15. Drawing dimension DPAK (type IDS-SUBCON.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 16. DPAK footprint recommended data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3/41
List of tables LD1117xx
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Electrical characteristics of LD1117#12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 5. Electrical characteristics of LD1117#18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 6. Electrical characteristics of LD1117#25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 7. Electrical characteristics of LD1117#28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 8. Electrical characteristics of LD1117#30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 9. Electrical characteristics of LD1117#33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 10. Electrical characteristics of LD1117#50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 11. Electrical characteristics of LD1117 (adjustable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 12. Electrical characteristics of LD1117#12C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 13. Electrical characteristics of LD1117#18C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 14. Electrical characteristics of LD1117#25C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 15. Electrical characteristics of LD1117#33C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 16. Electrical characteristics of LD1117#50C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 17. Electrical characteristics of LD1117C (adjustable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 18. DPAK mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 19. Footprint data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 20. Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 21. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4/41
LD1117xx Diagram
1 Diagram
Figure 1. Block diagram
5/41
Pin configuration LD1117xx
2 Pin configuration
Figure 2. Pin connections (top view)
SOT-223
DPAK
Note: The TAB is connected to the V
OUT
SO-8
TO-220
.
6/41
LD1117xx Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
P
T
V
STG
T
IN
TOT
OP
DC input voltage 15 V
Power dissipation 12 W
Storage temperature range -40 to +150 °C
for C Version -40 to +150 °C
Operating junction temperature range
for standard Version 0 to +150 °C
Table 3. Thermal data
Symbol Parameter SOT-223 SO-8 DPAK TO-220 Unit
R
R
Thermal resistance junction-case 15 20 8 3 °C/W
thJC
Thermal resistance junction-ambient 50 °C/W
thJA
7/41
Schematic application LD1117xx
4 Schematic application
Figure 3. Application circuit (for 1.2 V)
Figure 4. Application circuit (for other fixed output voltages)
8/41
LD1117xx Electrical characteristics
5 Electrical characteristics
Table 4. Electrical characteristics of LD1117#12
(refer to the test circuits, T
pins, unless otherwise specified).
Symbol Parameter Test condition Min. Typ. Max. Unit
V
Output voltage Vin = 3.2 V, IO = 10 mA, TJ = 25°C 1.188 1.20 1.212 V
O
V
Reference voltage
O
ΔV
ΔV
ΔV
ΔV
ΔI
Line regulation Vin - VO = 1.5 to 13.75 V, IO = 10 mA 0.035 0.2 %
O
Load regulation Vin - VO = 3 V, IO = 10 to 800 mA 0.1 0.4 %
O
Temperature stability 0.5 %
O
Long term stability 1000 hrs, TJ = 125°C 0.3 %
O
Operating input voltage 15 V
V
in
I
Adjustment pin current Vin ≤ 15 V 60 120 µA
adj
Adjustment pin current change
adj
= 0 to 125 °C, CO = 10 µF, R = 120 Ω between GND and OUT
J
= 10 to 800 mA
I
O
- VO= 1.4 to 10 V
V
in
- VO = 1.4 to 10 V
V
in
IO = 10 to 800 mA
1.140 1.20 1.260 V
15µA
I
O(min)
Minimum load current Vin = 15 V 2 5 mA
Output current Vin - VO = 5 V, TJ = 25°C 800 950 1300 mA
I
O
eN Output noise (%V
) B =10Hz to 10kHz, TJ = 25°C 0.003 %
O
SVR Supply voltage rejection
V
Dropout voltage
d
Thermal regulation T
I
= 40 mA, f = 120Hz, TJ = 25°C
O
Vin - VO = 3 V, V
= 100 mA 1 1.1
I
O
= 500 mA 1.05 1.15
O
= 800 mA 1.10 1.2
I
O
= 25°C, 30ms Pulse 0.01 0.1 %/W
a
ripple
= 1 V
PP
60 75 dB
VI
9/41
Electrical characteristics LD1117xx
Table 5. Electrical characteristics of LD1117#18
(refer to the test circuits, T
Symbol Parameter Test condition Min. Typ. Max. Unit
V
Output voltage Vin = 3.8 V, IO = 10 mA, TJ = 25°C 1.78 1.8 1.82 V
O
Output voltage IO = 0 to 800 mA, Vin = 3.3 to 8 V 1.76 1.84 V
V
O
ΔV
ΔV
ΔV
ΔV
SVR Supply voltage rejection
Line regulation Vin = 3.3 to 8 V, IO = 0 mA 1 6 mV
O
Load regulation Vin = 3.3 V, IO = 0 to 800 mA 1 10 mV
O
Temperature stability 0.5 %
O
Long term stability 1000 hrs, TJ = 125°C 0.3 %
O
Operating input voltage IO = 100 mA 10 V
V
in
Quiescent current Vin ≤ 8 V 5 10 mA
I
d
I
Output current Vin = 6.8 V, TJ = 25°C 800 950 1300 mA
O
eN Output noise voltage B =10Hz to 10kHz, T
Dropout voltage
V
d
Thermal regulation T
= 0 to 125 °C, CO = 10 µF, unless otherwise specified).
J
= 25°C 100 µV
J
= 40 mA, f = 120Hz, TJ = 25°C
I
O
= 5.5 V, V
V
in
I
= 100 mA 1 1.1
O
= 500 mA 1.05 1.15
O
I
= 800 mA 1.10 1.2
O
= 25°C, 30ms Pulse 0.01 0.1 %/W
a
ripple
= 1 V
PP
60 75 dB
VI
10/41
LD1117xx Electrical characteristics
Table 6. Electrical characteristics of LD1117#25
(refer to the test circuits, T
Symbol Parameter Test condition Min. Typ. Max. Unit
V
Output voltage Vin = 4.5 V, IO = 10 mA, TJ = 25°C 2.475 2.5 2.525 V
O
Output voltage IO = 0 to 800 mA, Vin = 3.9 to 10 V 2.45 2.55 V
V
O
ΔV
ΔV
ΔV
ΔV
SVR Supply voltage rejection
Line regulation Vin = 3.9 to 10 V, IO = 0 mA 1 6 mV
O
Load regulation Vin = 3.9 V, IO = 0 to 800 mA 1 10 mV
O
Temperature stability 0.5 %
O
Long term stability 1000 hrs, TJ = 125°C 0.3 %
O
V
Operating input voltage IO = 100 mA 15 V
in
Quiescent current Vin ≤ 10 V 5 10 mA
I
d
Output current Vin = 7.5 VTJ = 25°C 800 950 1300 mA
I
O
eN Output noise voltage B =10Hz to 10kHz, T
Dropout voltage
V
d
Thermal regulation T
= 0 to 125 °C, CO = 10 µF, unless otherwise specified).
J
= 25°C 100 µV
J
= 40 mA, f = 120Hz, TJ = 25°C
I
O
Vin = 5.5 V, V
I
= 100 mA 1 1.1
O
= 500 mA 1.05 1.15
O
= 800 mA 1.10 1.2
I
O
= 25°C, 30ms Pulse 0.01 0.1 %/W
a
ripple
= 1 V
PP
60 75 dB
VI
11/41
Electrical characteristics LD1117xx
Table 7. Electrical characteristics of LD1117#28
(refer to the test circuits, T
Symbol Parameter Test condition Min. Typ. Max. Unit
V
Output voltage Vin = 4.85 V, IO = 10 mA, TJ = 25°C 2.82 2.85 2.88 V
O
Output voltage IO = 0 to 800 mA, Vin = 4.25 to 10 V 2.79 2.91 V
V
O
ΔV
ΔV
ΔV
ΔV
SVR Supply voltage rejection
Line regulation Vin = 4.25 to 10 V, IO = 0 mA 1 6 mV
O
Load regulation Vin = 4.25 V, IO = 0 to 800 mA 1 10 mV
O
Temperature stability 0.5 %
O
Long term stability 1000 hrs, TJ = 125°C 0.3 %
O
V
Operating input voltage IO = 100 mA 15 V
in
Quiescent current Vin ≤ 10 V 5 10 mA
I
d
Output current Vin = 7.85 VTJ = 25°C 800 950 1300 mA
I
O
eN Output noise voltage B =10Hz to 10kHz, T
Dropout voltage
V
d
Thermal regulation T
= 0 to 125 °C, CO = 10 µF, unless otherwise specified).
J
= 25°C 100 µV
J
= 40 mA, f = 120Hz, TJ = 25°C
I
O
Vin = 5.85 V, V
I
= 100 mA 1 1.1
O
= 500 mA 1.05 1.15
O
= 800 mA 1.10 1.2
I
O
= 25°C, 30ms Pulse 0.01 0.1 %/W
a
ripple
= 1 V
PP
60 75 dB
VI
12/41
LD1117xx Electrical characteristics
Table 8. Electrical characteristics of LD1117#30
(refer to the test circuits, T
Symbol Parameter Test condition Min. Typ. Max. Unit
V
Output voltage Vin = 5 V, IO = 10 mA, TJ = 25°C 2.97 3 3.03 V
O
Output voltage IO = 0 to 800 mA, Vin = 4.5 to 10 V 2.94 3.06 V
V
O
ΔV
ΔV
ΔV
ΔV
SVR Supply voltage rejection
Line regulation Vin = 4.5 to 12 V, IO = 0 mA 1 6 mV
O
Load regulation Vin = 4.5 V, IO = 0 to 800 mA 1 10 mV
O
Temperature stability 0.5 %
O
Long term stability 1000 hrs, TJ = 125°C 0.3 %
O
V
Operating input voltage IO = 100 mA 15 V
in
Quiescent current Vin ≤ 12 V 5 10 mA
I
d
Output current Vin = 8 V, TJ = 25°C 800 950 1300 mA
I
O
eN Output noise voltage B =10Hz to 10kHz,T
Dropout voltage
V
d
Thermal regulation T
= 0 to 125 °C, CO = 10 µF, unless otherwise specified).
J
= 25°C 100 µF
J
= 40 mA, f = 120Hz, TJ = 25°C
I
O
Vin = 6 V, V
I
= 100 mA 1 1.1
O
= 500 mA 1.05 1.15
O
= 800 mA 1.10 1.2
I
O
= 25°C, 30ms Pulse 0.01 0.1 %/W
a
ripple
= 1 V
PP
60 75 dB
VI
13/41
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