ST LD1117AS12TR, LD1117ADT12TR, LD1117AS18TR, LD1117ADT18TR, LD1117AS33TR User Manual

LD1117AXX12, LD1117AXX18,

LD1117AXX33, LD1117AXX

Low drop fixed and adjustable positive voltage regulators

Features

■Low dropout voltage:

–1.15 V typ. @ IOUT = 1 A, 25 °C

■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 (VREF = 1.25 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

TO-220

SOT-223

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.

Description

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

www.st.com

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

TO-220

DPAK

Note:

The TAB is connected to the VOUT.

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
VIN		DC input voltage			15			V
PD		Power dissipation			12			W
TSTG		Storage temperature range				-40 to +150		°C
TOP		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
RthJC	Thermal resistance junction-case		15	8		5		°C/W
RthJA	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
VO	Output voltage	VI = 5.3 V, IO = 10 mA, TJ = 25 °C	1.176	1.2	1.224	V
VO	Output voltage	IO = 0 to 1 A, VI = 2.75 to 10 V	1.152	1.2	1.248	V
VO	Line regulation	VI = 2.75 to 8 V, IO = 0 mA		1	6	mV
VO	Load regulation	VI = 2.75 V, IO = 0 to 1 A		1	10	mV
VO	Temperature stability			0.5		%
VO	Long term stability	1000 hrs, TJ = 125 °C		0.3		%
VI	Operating input voltage	IO = 100 mA			10	V
Id	Quiescent current	VI ≤ 8 V, IO = 0 mA		5	10	mA
IO	Output current	VI - VO = 5 V, TJ = 25 °C	1000	1200		mA
eN	Output noise voltage	B =10 Hz to 10 kHz, TJ = 25 °C		100		µV
SVR	Supply voltage rejection	IO = 40 mA, f = 120 Hz	60	80		dB
		VI - VO = 3 V, Vripple = 1 VPP
		IO = 100 mA		1	1.10
VD	Dropout voltage	IO = 500 mA		1.05	1.15	V
		IO = 1 A		1.15	1.30
VO(pwr)	Thermal regulation	Ta = 25 °C, 30 ms pulse		0.08	0.2	%/W

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
VO	Output voltage	VI = 3.8 V, IO = 10 mA, TJ = 25 °C	1.764	1.8	1.836	V
VO	Output voltage	IO = 0 to 1 A, VI = 3.3 to 8 V	1.728		1.872	V
VO	Line regulation	VI = 3.3 to 8 V, IO = 0 mA		1	6	mV
VO	Load regulation	VI = 3.3 V, IO = 0 to 1 A		1	10	mV
VO	Temperature stability			0.5		%
VO	Long term stability	1000 hrs, TJ = 125 °C		0.3		%
VI	Operating input voltage	IO = 100 mA			10	V
Id	Quiescent current	VI ≤ 8 V, IO = 0 mA		5	10	mA
IO	Output current	VI - VO = 5 V, TJ = 25 °C	1000			mA
eN	Output noise voltage	B =10 Hz to 10 kHz, TJ = 25 °C		100		µV
SVR	Supply voltage rejection	IO = 40 mA, f = 120 Hz	60	80		dB
		VI - VO = 3 V, Vripple = 1 VPP
		IO = 100 mA		1	1.10
VD	Dropout voltage	IO = 500 mA		1.05	1.15	V
		IO = 1 A		1.15	1.30
VO(pwr)	Thermal regulation	Ta = 25 °C, 30 ms pulse		0.08	0.2	%/W

8/24	Doc ID 7194 Rev 24