Datasheet LD1117AS12TR, LD1117ADT12TR, LD1117AS18TR, LD1117ADT18TR, LD1117AS33TR Datasheet (ST)

LD1117AXX12, LD1117AXX18,

Low drop fixed and adjustable positive voltage regulators

Features

■ Low dropout voltage:

– 1.15 V typ. @ I

■ Very low quiescent current:

– 5 mA typ. @ 25 °C

■ Output current up to 1 A

■ Fixed output voltage of:

– 1.2 V, 1.8 V, 2.5 V, 3.3 V

■ Adjustable version availability (V

■ Internal current and thermal limit

■ Only 10 µF for stability

■ Available in ± 2% (at 25 °C) and 4% in full

temperature range

■ High supply voltage rejection:

– 80 dB typ. (at 25 °C)

■ Temperature range: 0 °C to 125 °C

= 1 A, 25 °C

OUT

= 1.25 V)

REF

LD1117AXX33, LD1117AXX

TO-220

DPAK

common 10 µF minimum capacitor is needed for
stability. Chip trimming allows the regulator to
reach a very tight output voltage tolerance, within
± 2% at 25 °C.

SOT-223

Description

The LD1117Axx is a low drop voltage regulator
able to provide up to 1 A of output current,
available also in adjustable versions (V

1.25 V). In fixed versions, the following output
voltages are offered: 1.2 V, 1.8 V, 2.5 V and 3.3 V.
The device is supplied in: SOT-223, DPAK and
TO-220. Surface mounted packages optimize the
thermal characteristics while offering a relevant
space saving advantage. High efficiency is
assured by an NPN pass transistor. Only a very

Table 1. Device summary

Order codes

SOT-223 DPAK TO-220

LD1117AS12TR LD1117ADT12TR 1.2 V

LD1117AS18TR LD1117ADT18TR 1.8 V

LD1117AS33TR LD1117ADT33TR LD1117AV33 3.3 V

LD1117ASTR LD1117ADT-TR Adjustable from 1.25 V

December 2011 Doc ID 7194 Rev 24 1/24

REF

=

Output voltage

www.st.com

24

Contents LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

Contents

1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 LD1117A adjustable: application note . . . . . . . . . . . . . . . . . . . . . . . . . 14

8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2/24 Doc ID 7194 Rev 24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Diagram

1 Diagram

Figure 1. Block diagram

Doc ID 7194 Rev 24 3/24

Pin configuration LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

2 Pin configuration

Figure 2. Pin connections (top view)

SOT-223

Note: The TAB is connected to the V

OUT

TO-220

.

DPAK

4/24 Doc ID 7194 Rev 24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Maximum ratings

3 Maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

T

V

P

STG

T

IN

D

OP

DC input voltage 15 V

Power dissipation 12 W

Storage temperature range -40 to +150 °C

Operating junction temperature range 0 to +125 °C

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these condition is not implied. Beyond the above suggested
max. power dissipation, a short-circuit may permanently damage the device.

Table 3. Thermal data

Symbol Parameter SOT-223 DPAK TO-220 Unit

R

R

thJC

thJA

Thermal resistance junction-case 15 8 5 °C/W

Thermal resistance junction-ambient 50 °C/W

Doc ID 7194 Rev 24 5/24

Schematic application LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

4 Schematic application

Figure 3. Application circuit (for other fixed output voltages)

6/24 Doc ID 7194 Rev 24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Electrical characteristics

5 Electrical characteristics

Refer to the test circuits, TJ = 0 to 125 °C, CO = 10 µF, CI = 10 µF, R = 120 Ω between OUT­GND, unless otherwise specified.

Table 4. Electrical characteristics of LD1117A#12

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

ΔV

ΔV

ΔV

ΔV

Output voltage VI = 5.3 V, IO = 10 mA, TJ = 25 °C 1.176 1.2 1.224 V

O

Output voltage IO = 0 to 1 A, VI = 2.75 to 10 V 1.152 1.2 1.248 V

O

Line regulation VI = 2.75 to 8 V, IO = 0 mA 1 6 mV

O

Load regulation VI = 2.75 V, IO = 0 to 1 A 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

I

I

Quiescent current VI ≤ 8 V, IO = 0 mA 5 10 mA

d

Output current VI - VO = 5 V, TJ = 25 °C 1000 1200 mA

I

O

eN Output noise voltage B =10 Hz to 10 kHz, T

I

= 40 mA, f = 120 Hz

SVR Supply voltage rejection

ΔV

V

O(pwr)

Dropout voltage

D

Thermal regulation Ta = 25 °C, 30 ms pulse 0.08 0.2 %/W

O

VI - VO = 3 V, V

= 100 mA 1 1.10

I

O

= 500 mA 1.05 1.15

O

= 1 A 1.15 1.30

I

O

ripple

= 25 °C 100 µV

J

= 1 V

PP

60 80 dB

VI

Doc ID 7194 Rev 24 7/24

Electrical characteristics LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

Refer to the test circuits, TJ = 0 to 125 °C, CO = 10 µF, CI = 10 µF, unless otherwise
specified.

Table 5. Electrical characteristics of LD1117A#18

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

ΔV

ΔV

ΔV

ΔV

Output voltage VI = 3.8 V, IO = 10 mA, TJ = 25 °C 1.764 1.8 1.836 V

O

Output voltage IO = 0 to 1 A, VI = 3.3 to 8 V 1.728 1.872 V

O

Line regulation VI = 3.3 to 8 V, IO = 0 mA 1 6 mV

O

Load regulation VI = 3.3 V, IO = 0 to 1 A 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

I

I

Quiescent current VI ≤ 8 V, IO = 0 mA 5 10 mA

d

Output current VI - VO = 5 V, TJ = 25 °C 1000 mA

I

O

eN Output noise voltage B =10 Hz to 10 kHz, T

= 40 mA, f = 120 Hz

I

SVR Supply voltage rejection

Dropout voltage

D

Thermal regulation Ta = 25 °C, 30 ms pulse 0.08 0.2 %/W

ΔV

V

O(pwr)

O

VI - VO = 3 V, V

I

= 100 mA 1 1.10

O

= 500 mA 1.05 1.15

O

= 1 A 1.15 1.30

I

O

ripple

= 25 °C 100 µV

J

= 1 V

PP

60 80 dB

VI

8/24 Doc ID 7194 Rev 24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Electrical characteristics

Refer to the test circuits, TJ = 0 to 125 °C, CO = 10 µF, CI = 10 µF, unless otherwise
specified.

Table 6. Electrical characteristics of LD1117A#33

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

ΔV

ΔV

ΔV

ΔV

Output voltage VI = 5.3 V, IO = 10 mA, TJ = 25 °C 3.234 3.3 3.366 V

O

Output voltage IO = 0 to 1 A, VI = 4.75 to 10 V 3.168 3.432 V

O

Line regulation VI = 4.75 to 8 V, IO = 0 mA 1 6 mV

O

Load regulation VI = 4.75 V, IO = 0 to 1 A 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

I

I

Quiescent current VI ≤ 10 V, IO = 0 mA 5 10 mA

d

Output current VI - VO = 5 V, TJ = 25 °C 1000 1200 mA

I

O

eN Output noise voltage B =10 Hz to 10 kHz, T

= 40 mA, f = 120 Hz

I

SVR Supply voltage rejection

Dropout voltage

D

Thermal regulation Ta = 25 °C, 30 ms pulse 0.08 0.2 %/W

ΔV

V

O(pwr)

O

VI - VO = 3 V, V

I

= 100 mA 1 1.10

O

= 500 mA 1.05 1.15

O

= 1 A 1.15 1.30

I

O

ripple

= 25 °C 100 µV

J

= 1 V

PP

60 75 dB

VI

Doc ID 7194 Rev 24 9/24

Electrical characteristics LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

Refer to the test circuits, TJ = 0 to 125 °C, CO = 10 µF, CI = 10 µF, unless otherwise
specified.

Table 7. Electrical characteristics of LD1117A (Adjustable)

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

ΔV

ΔV

ΔV

ΔV

I

ΔI

I

O(min)

Reference voltage VI = 5.3 V, IO = 10 mA, TJ = 25 °C 1.225 1.25 1.275 V

O

Reference voltage IO = 10 mA to 1 A, VI = 2.75 to 10 V 1.2 1.3 V

O

Line regulation VI = 2.75 to 8 V, IO = 0 mA 1 6 mV

O

Load regulation VI = 2.75 V, IO = 0 to 1 A 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

I

Adjustment pin current Vin ≤ 10 V 60 120 µA

adj

Adjustment pin current

adj

change

- VO = 1.4 to 10 V, IO = 10 mA to 1 A 1 5 µA

V

in

Minimum load current Vin = 10 V 2 5 mA

Output current VI - VO = 5 V, TJ = 25 °C 1000 1200 mA

I

O

eN Output noise voltage B =10 Hz to 10 kHz, T

= 40 mA, f = 120 Hz

I

SVR Supply voltage rejection

Dropout voltage

D

Thermal regulation Ta = 25 °C, 30 ms pulse 0.08 0.2 %/W

ΔV

V

O(pwr)

O

VI - VO = 3 V, V

I

= 100 mA 1 1.10

O

= 500 mA 1.05 1.15

O

= 1 A 1.15 1.30

I

O

ripple

= 25 °C 100 µV

J

= 1 V

PP

60 80 dB

VI

10/24 Doc ID 7194 Rev 24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Typical application

6 Typical application

Figure 4. Negative supply

Figure 5. Active terminator for SCSI-2 bus

Figure 6. Circuit for increasing output voltage

Doc ID 7194 Rev 24 11/24

Typical application LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

Figure 7. Voltage regulator with reference

Figure 8. Battery backed-up regulated supply

12/24 Doc ID 7194 Rev 24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Typical application

Figure 9. Post-regulated dual supply

Doc ID 7194 Rev 24 13/24

LD1117A adjustable: application note LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

7 LD1117A adjustable: application note

The LD1117A adjustable has a thermal stabilized 1.25 ± 0.012 V reference voltage between
the OUT and ADJ pins. I

R

is normally fixed to 120 Ω. From Figure 7 the following is obtained:

1

V
I

ADJ

OUT

= V

.

REF

+ R2 (I

ADJ

In normal applications the R
not be considered in the V

V

OUT

= V

(1 + R2 / R1).

REF

In order to have a better load regulation it is important to realize a good Kelvin connection of
R

and R2 resistors. In particular, the R1 connection must be realized very close to the OUT

1

and ADJ pins, while the R
negative load pin. Ripple rejection can be improved by introducing a 10 µF electrolytic
capacitor placed in parallel to the R

Figure 10. Adjustable output voltage application

is 60 µA typ. (120 µA max.) and ΔI

ADJ

+ IR1) = V

value is in the range of a few kΩ, so the R2 x I

2

calculation; the above expression then becomes:

OUT

ground connection must be placed as near as possible to the

2

+ R2 (I

REF

resistor (see Figure 10).

2

ADJ

+V

REF

/R1) = V

is 1 µA typ. (5 µA max.).

ADJ

(1 + R2 / R1) + R2 x

REF

product can

ADJ

Figure 11. Adjustable output voltage application with improved ripple rejection

14/24 Doc ID 7194 Rev 24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Package mechanical data

8 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK

®

packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com. ECOPACK
is an ST trademark.

Table 8. TO-220 mechanical data

Type STD - ST Dual Gauge Type STD - ST Single Gauge

Dim.

Min. Typ. Max. Min. Typ. Max.

A 4.40 4.60 4.40 4.60

b 0.61 0.88 0.61 0.88

b1 1.14 1.70 1.14 1.70

c 0.48 0.70 0.48 0.70

D 15.25 15.75 15.25 15.75

D1 1.27

E 10.00 10.40 10.00 10.40

mm. mm.

e 2.40 2.70 2.40 2.70

e1 4.95 5.15 4.95 5.15

F 1.23 1.32 0.51 0.60

H1 6.20 6.60 6.20 6.60

J1 2.40 2.72 2.40 2.72

L 13.00 14.00 13.00 14.00

L1 3.50 3.93 3.50 3.93

L20 16.40 16.40

L30 28.90 28.90

∅P 3.75 3.85 3.75 3.85

Q 2.65 2.95 2.65 2.95

Despite some difference in tolerances, the packages are compatible.

Doc ID 7194 Rev 24 15/24

Package mechanical data LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

Figure 12. Drawing dimension TO-220 (type STD-ST Dual Gauge)

Note: 1 Maximum resin gate protrusion: 0.5 mm.

2 An accepted resin gate protrusion can be found in each of the two positions shown on the

drawing, or in their symmetrical position with respect to the vertical axis.

16/24 Doc ID 7194 Rev 24

0015988_S

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Package mechanical data

Figure 13. Drawing dimension TO-220 (type STD-ST Single Gauge)

8174627_B

Doc ID 7194 Rev 24 17/24

Package mechanical data LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

Figure 14. Drawing dimension tube for TO-220 Dual Gauge (mm.)

Figure 15. Drawing dimension tube for TO-220 Single Gauge (mm.)

18/24 Doc ID 7194 Rev 24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Package mechanical data

SOT-223 mechanical data

mm. mils.

Dim.

Min. Typ. Max. Min. Typ. Max.

A1.8 70.9

A1 0.02 0.1 0.83.9

B 0.6 0.7 0.8523.6 27.6 33.5

B1 2.933.15 114.2 118.1 124.0

c 0.24 0.26 0.35 9.4 10.2 13.8

D6.3 6.5 6.7 248.0 255.9 263.8

e2.390.6

e1 4.6 181.1

E 3.33.5 3.7 129.9 137.8 145.7

H6.77 7.3 263.8 275.7 287.5

V 10° 10°

0046067/H

Doc ID 7194 Rev 24 19/24

Package mechanical data LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

DPAK mechanical data

Dim.

mm. inch.

Min. Typ. Max. Min. Typ. Max.

A 2.2 2.4 0.086 0.094
A1 0.9 1.1 0.035 0.043
A2 0.03 0.23 0.001 0.009

B 0.64 0.9 0.025 0.035
b4 5.2 5.4 0.204 0.212

C 0.45 0.6 0.017 0.023

C2 0.48 0.6 0.019 0.023

D 6 6.2 0.236 0.244

D1 5.1 0.200

E 6.4 6.6 0.252 0.260
E1 4.7 0.185

e2.28 0.090
e1 4.4 4.6 0.173 0.181

H 9.35 10.1 0.368 0.397

L 1 0.039

(L1)

2.8 0.110
L2 0.8 0.031
L4 0.6 1 0.023 0.039

R 0.2 0.008

V2 0° 8°0° 8°

20/24 Doc ID 7194 Rev 24

0068772-F

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Package mechanical data

Tape & reel SOT223 mechanical data

Dim.

mm. inch.

Min. Typ. Max. Min. Typ. Max.

A 330 12.992

C 12.8 13.0 13.2 0.504 0.512 0.519

D 20.2 0.795

N60 2.362

T 14.4 0.567

Ao 6.73 6.83 6.93 0.265 0.269 0.273

Bo 7.32 7.42 7.52 0.288 0.292 0.296

Ko 1.78 2 0.070 0.078

Po 3.9 4.0 4.1 0.153 0.157 0.161

P7.98.0 8.1 0.311 0.315 0.319

Doc ID 7194 Rev 24 21/24

Package mechanical data LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

Tape & reel DPAK-PPAK mechanical data

Dim.

mm. inch.

Min. Typ. Max. Min. Typ. Max.

A 330 12.992

C12.8 13.0 13.2 0.504 0.512 0.519

D 20.2 0.795

N60 2.362

T22.40.882

Ao 6.806.90 7.00 0.268 0.272 0.2.76

Bo 10.40 10.50 10.60 0.409 0.413 0.417

Ko 2.55 2.65 2.75 0.100 0.104 0.105

Po 3.9 4.0 4.1 0.153 0.157 0.161

P7.98.0 8.1 0.311 0.315 0.319

22/24 Doc ID 7194 Rev 24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX Revision history

9 Revision history

Table 9. Document revision history

Date Revision Changes

29-Sep-2004 11 Add new part number.

12-Oct-2004 12 Mistake VO max. - Table 4.

21-Apr-2005 13 Add new package - D²PAK/A.

05-Jul-2005 14 The DPAK mechanical data updated.

10-Feb-2006 15 Add new package - D²PAK/A (B type).

20-Dec-2006 16 Change value VIN on Ta bl e 2 .

19-Jan-2007 17 D²PAK/A mechanical data updated and add footprint data.

28-May-2007 18 Add I

07-Jun-2007 19 Add I

and ΔI

ADJ

value on Tab le 7 .

O(min)

15-Apr-2008 20 Modified: Table 10.

28-Jul-2009 21 Modified: Table 10.

05-Jul-2010 22

Added: Table 8 on page 15, Figure 12 on page 16, Figure 13 on page 17,

Figure 14 and Figure 15 on page 18.

values on Ta b le 7 .

ADJ

16-Nov-2010 23 Modified: Table 1 on page 1, R

16-Dec-2011 24

Modified: V

page 10.

parameter output voltage ==> Reference voltage Ta b l e 7 on

O

value for TO-220 Table 3 on page 5.

thJC

Doc ID 7194 Rev 24 23/24

LD1117AXX12, LD1117AXX18, LD1117AXX33, LD1117AXX

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24/24 Doc ID 7194 Rev 24