ST L4931CD27-TR, L4931CD27-TRY, L4931ABPT27TR, L4931CD33-TR, L4931CPT33-TR User Manual

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L4931ABxx

L4931Cxx

Very low drop voltage regulators with inhibit

Features

■Very low dropout voltage (0.4 V)

■Very low quiescent current

■(Typ. 50 µA in off mode, 600 µA in on mode)

■Output current up to 250 mA

■Logic-controlled electronic shutdown

■Output voltages of 2.7; 3.3; 3.5; 5; 8; 12 V

■Automotive Grade product: 2.7 V, 3.3 V, 3.5 V VOUT only in SO-8 package

■Internal current and thermal limit

■Only 2.2 µF for stability

■Available in ± 1 % (AB) or 2 % (C) selection at 25 °C

■Supply voltage rejection: 70 dB typ. for 5 V version

■Temperature range: -40 to 125 °C

Description

The L4931ABxx L4931Cxx are very Low Drop regulators available in TO-220, SO-8, DPAK, PPAK and TO-92 packages and in a wide range of output voltages.

The very low drop voltage (0.4 V) and the very low quiescent current make them particularly suitable for low noise, low power applications and specially in battery powered systems.

A TTL compatible shutdown logic control function is available in PPAK and SO-8 packages.

TO-220

TO-92

PPAK

DPAK

SO-8

This means that when the device is used as a local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. It requires only a 2.2 µF capacitor for stability allowing space and cost saving.

The L4931 is available as Automotive Grade in SO-8 package only, for the options of output voltages whose commercial Part Numbers are shown in the Table 19 on page 34 (order codes). These devices are qualified according to the specification AEC-Q100 of the Automotive market, in the temperature range -40 °C to

125 °C, and the statistical tests PAT, SYL, SBL are performed.

Table 1.	Device summary
		Part numbers

L4931ABXX27		L4931CXX33		L4931ABXX50	L4931CXX80

L4931CXX27		L4931ABXX35		L4931CXX50	L4931ABXX120

L4931ABXX33		L4931CXX35		L4931ABXX80	L4931CXX120

August 2008			Rev 17		1/36

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Contents	L4931ABxx - L4931Cxx

Contents

1	Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 5
2	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 6
3	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
4	Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	8
5	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
6	Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	24
7	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	25
8	Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	34
9	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	35

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L4931ABxx - L4931Cxx	List of figures

List of figures

Figure 1. Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 3. Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 4. Line regulation vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 5. Dropout voltage vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 6. Supply current vs input voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 7. Supply current vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 8. Short circuit current vs dropout voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 9. SVR vs input voltage signal frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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List of tables	L4931ABxx - L4931Cxx

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 4. Electrical characteristics of L4931ABxx27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 5. Electrical characteristics of L4931Cxx27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 6. Electrical characteristics of L4931Cxx27-TRY (Automotive Grade) . . . . . . . . . . . . . . . . . . 11 Table 7. Electrical characteristics of L4931ABxx33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 8. Electrical characteristics of L4931Cxx33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 9. Electrical characteristics of L4931Cxx33-TRY (Automotive Grade) . . . . . . . . . . . . . . . . . . 14 Table 10. Electrical characteristics of L4931ABxx35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 11. Electrical characteristics of L4931ABxx35-TRY (Automotive Grade) . . . . . . . . . . . . . . . . . 16 Table 12. Electrical characteristics of L4931Cxx35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 13. Electrical characteristics of L4931ABxx50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 14. Electrical characteristics of L4931Cxx50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 15. Electrical characteristics of L4931ABxx80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 16. Electrical characteristics of L4931Cxx80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 17. Electrical characteristics of L4931ABxx120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 18. Electrical characteristics of L4931Cxx120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 19. Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Table 20. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

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L4931ABxx - L4931Cxx	Diagram

1 Diagram

Figure 1. Schematic diagram

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ST L4931CD27-TR, L4931CD27-TRY, L4931ABPT27TR, L4931CD33-TR, L4931CPT33-TR User Manual

Pin configuration	L4931ABxx - L4931Cxx

2 Pin configuration

Figure 2. Pin connections (top view)

TO-220		SO-8
		SO-8
PPAK		DPAK
	PIN 1	= VOUT
	PIN 2	= GND
	PIN 3	= VIN
	BOTTOM VIEW
	TO-92

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L4931ABxx - L4931Cxx

Maximum ratings

Table 2.

Absolute maximum ratings

Symbol

Parameter

Value

Unit

DC Input voltage

Output current

Internally limited

Power dissipation

Internally limited

TSTG

Storage temperature range

-40 to 150

°C

TOP

Operating junction temperature range

-40 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

Table 3.

Thermal data

Symbol

Parameter

TO-220

SO-8

DPAK

PPAK

TO-92

Unit

RthJC

Thermal resistance junction-case

°C/W

RthJA

Thermal resistance junction-ambient

100

200

°C/W

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Application circuit	L4931ABxx - L4931Cxx

4 Application circuit

Figure 3. Test circuit

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L4931ABxx - L4931Cxx	Electrical characteristics

5 Electrical characteristics

Table 4.

Electrical characteristics of L4931ABxx27 (refer to the test circuits, TA = 25 °C,

CI = 0.1 µF, CO = 2.2 µF unless otherwise specified).

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

IO = 5 mA, VI = 4.7 V

2.673

2.7

2.727

IO = 5 mA, VI = 4.7 V, TA=-25 to 85°C

2.646

2.754

Operating input voltage

IO = 250 mA

Iout

Output current limit

300

Line regulation

VI = 3.4 to 20 V, IO = 0.5 mA

Load regulation (1)

= 3.6 V, I

= 0.5 to 250 mA

Quiescent current

VI = 3.6 to 20 V, IO = 0 mA

0.6

ON MODE

VI = 3.6 to 20 V, IO = 250 mA

OFF MODE

VI = 6 V

100

µA

f = 120 Hz

SVR

Supply voltage rejection

IO = 5 mA

f = 1 kHz

VI = 4.6 ± 1 V

f = 10 kHz

Output noise voltage

B = 10 Hz to 100 kHz

µV

Dropout voltage (1)

IO = 250 mA

0.4

0.6

IO = 250 mA, TA= -40 to 125°C

0.8

VIL

Control input logic low

TA = -40 to 125°C

0.8

VIH

Control Input Logic High

TA = -40 to 125°C

Control input current

VI = 6 V, VC = 6 V

µA

Output bypass

ESR = 0.1 to 10 Ω, IO = 0 to 250 mA

µF

capacitance

1. For SO-8 package the maximum limit of load regulation and dropout is increased by 20 mV.

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Electrical characteristics

L4931ABxx - L4931Cxx

Table 5.

Electrical characteristics of L4931Cxx27 (refer to the test circuits, TA = 25 °C,

CI = 0.1 µF, CO = 2.2 µF unless otherwise specified).

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

IO = 5 mA, VI = 4.7 V

2.646

2.7

2.754

IO = 5 mA, VI = 4.7 V, TA=-25 to 85°C

2.592

2.808

Operating input voltage

IO = 250 mA

Iout

Output current limit

300

Line regulation

VI = 3.4 to 20 V, IO = 0.5 mA

Load regulation (1)

= 3.6 V, I

= 0.5 to 250 mA

Quiescent current

VI = 3.6 to 20 V, IO = 0 mA

0.6

ON MODE

VI = 3.6 to 20 V, IO = 250 mA

OFF MODE

VI = 6 V

100

µA

f = 120 Hz

SVR

Supply voltage rejection

IO = 5 mA

f = 1 kHz

VI = 4.6 ± 1 V

f = 10 kHz

Output noise voltage

B = 10 Hz to 100 kHz

µV

Dropout voltage (1)

IO = 250 mA

0.4

0.6

IO = 250 mA, TA= -40 to 125°C

0.8

VIL

Control input logic low

TA = -40 to 125°C

0.8

VIH

Control Input Logic High

TA = -40 to 125°C

Control input current

VI = 6 V, VC = 6 V

µA

Output bypass

ESR = 0.1 to 10 Ω, IO = 0 to 250 mA

µF

capacitance

1. For SO-8 package the maximum limit of load regulation and dropout is increased by 20 mV.

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L4931ABxx - L4931Cxx				Electrical characteristics

Table 6.	Electrical characteristics of L4931Cxx27-TRY (Automotive Grade) (refer to the test
	circuits, TA = -40 to 12 5°C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified).
Symbol	Parameter	Test conditions		Min.	Typ.	Max.	Unit

VO	Output voltage	IO = 5 mA, VI = 4.7 V, TA = 25°C		2.646	2.7	2.754	V
VO	Output voltage	IO = 5 mA, VI = 4.7 V		2.592		2.808	V
		IO = 5 mA, VI = 4.7 V		2.592		2.808
VI	Operating input voltage	IO = 250 mA				20	V
Iout	Output current limit	TA = 25°C			300		mA
VO	Line regulation	VI = 3.4 to 20 V, IO = 0.5 mA				20	mV
VO	Load regulation	VI = 3.6 V, IO = 0.5 to 250 mA				38	mV
	Quiescent current	VI = 3.6 to 20 V, IO = 0 mA				1	mA
Id	ON MODE	VI = 3.6 to 20 V, IO = 250 mA				6	mA
	ON MODE

	OFF MODE	VI = 6 V				100	µA
		IO = 5 mA	f = 120 Hz		74
SVR	Supply voltage rejection

		VI = 4.6 ± 1 V	f = 1 kHz		71		dB
		TA = 25°C
		TA = 25°C	f = 10 kHz		55
			f = 10 kHz		55

eN	Output noise voltage	B = 10 Hz to 100 kHz, TA = 25°C			50		µV
Vd	Dropout voltage	IO = 250 mA, TA = 25°C			0.4	0.6	V
Vd	Dropout voltage	IO = 250 mA				0.82	V
		IO = 250 mA				0.82	V
VIL	Control input logic low					0.82	V
VIH	Control Input Logic High			2			V
II	Control input current	VI = 6 V, VC = 6 V, TA = 25°C			10		µA
CO	Output bypass	ESR = 0.1 to 10 Ω, IO = 0 to 250 mA,		2	10		µF
CO	capacitance	TA = 25°C		2	10		µF
	capacitance	TA = 25°C

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