ST LE30CD-TR, LE33CD-TR, LE33CZ-TR, LE33CZ-AP, LE45CD-TR User Manual

LExxAB

LExxC

Very low dropout voltage regulators with inhibit function

Features

■Very low dropout voltage (0.2 V typ.)

■Very low quiescent current (typ. 50 µA in OFF mode, 0.5 mA in ON mode, no load)

■Output current up to 100 mA

■Output voltages of 3 V, 3.3 V, 4.5 V, 5 V, 8 V

■Internal current and thermal limit

■Small 2.2 µF capacitor for stability

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

■Supply voltage rejection: 80 dB (typ.)

■Temperature range: - 40 to 125 °C

Description

The LExxAB and LExxC are very low dropout voltage regulators available in SO-8 and TO-92 packages and over a wide range of output voltages.

The very low dropout voltage (0.2 V) and the very low quiescent current make them particularly suitable for low-noise low-power applications and especially in battery-powered systems.

Datasheet − production data

TO-92

SO-8

These devices are pin-to-pin compatible with the older L78Lxx series. Furthermore, in the 8-pin configuration (SO-8) they employ a shutdown logic control (pin 5, TTL compatible). This means that when the device is used as a local regulator, a part of the board can be put in standby, decreasing even more total power consumption. In the three-terminal configuration (TO-92) the device is always in the ON state, maintaining the same electrical performance. It requires only a 2.2 µF capacitor for stability, reducing component size and cost.

Table 1.	Device summary
			Order codes
					Output voltages
	SO-8		TO-92	TO-92 (Ammopak)
(tape and reel)			(tape and reel)
			LE30ABZ-TR		3 V
LE30CD-TR					3 V
LE33CD-TR			LE33CZ-TR	LE33CZ-AP	3.3 V
LE45CD-TR					4.5 V
LE50ABD-TR				LE50ABZ-AP	5 V
LE50CD-TR					5 V
LE80CD-TR					8 V
May 2012			Doc ID 2573 Rev 13		1/22

This is information on a product in full production.

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Contents	LExxAB, LExxC

Contents

1	Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3
2	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 4
3	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
4	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
5	Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
6	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
7	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	21

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LExxAB, LExxC	Diagram

1 Diagram

Figure 1. Block diagram

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Pin configuration	LExxAB, LExxC

2 Pin configuration

Figure 2. Pin connections (top view for SO-8, bottom view for TO-92)

PIN 1 = VOUT

PIN 2 = GND

PIN 3 = VIN

SO-8

TO-92

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LExxAB, LExxC	Maximum ratings

3	Maximum ratings
Table 2.	Absolute maximum ratings
Symbol		Parameter	Value	Unit
VI		DC input voltage	20	V
IO		Output current	Internally limited (1)
PTOT		Power dissipation	Internally limited
TSTG		Storage temperature range	-65 to 150	°C
TOP		Operating junction temperature range	-40 to 125	°C

1.Our SO-8 package used for voltage regulators is modified internally to have pins 2, 3, 6 and 7 electrically fused to the die attach pad. This particular frame decreases the total thermal resistance of the package and increases its ability to dissipate power when an appropriate area of copper on the printed circuit board is available for heatsinking. The external dimensions are the same as for the standard SO-8.

Table 3.

Thermal data

Symbol

Parameter

SO-8

TO-92

Unit

RthJC

Thermal resistance junction-case

20

°C/W

RthJA

Thermal resistance junction-ambient

55

200

°C/W

Figure 3.

Test circuit

Note:	If the INHIBIT pin is left floating, the regulator is in the ON mode. However, to avoid picking
	up any noise, it is suggested to ground it when the Inhibit function is not used.

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Electrical characteristics							LExxAB, LExxC
4	Electrical characteristics
	Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Table 4.	Electrical characteristics for LE30AB
Symbol	Parameter	Test conditions			Min.	Typ.		Max.	Unit
VO	Output voltage	IO = 10 mA, VI = 5 V			2.970	3		3.030	V
		IO = 10 mA, VI = 5 V, TJ = -25 to 85°C			2.940			3.060
VI	Operating input voltage	IO = 100 mA						18	V
IO	Output current limit				150				mA
VO	Line regulation	VI = 3.7 to 18 V, IO = 0.5 mA				3		15	mV
VO	Load regulation	VI = 4 V, IO = 0.5 to 100 mA				3		15	mV
		VI = 4 to 18 V, IO = 0 mA		ON mode		0.5		1	mA
Id	Quiescent current	VI = 4 to 18 V, IO = 100 mA				1.5		3
		VI = 6 V		OFF mode		50		100	µA
				f = 120 Hz		81
SVR	Supply voltage rejection	IO = 5 mA, VI = 5 ± 1 V
				f = 1 kHz		76			dB
				f = 10 kHz		60
eN	Output noise voltage	B = 10 Hz to 100 kHz				50			µV
Vd	Dropout voltage	IO = 100 mA				0.2		0.4	V
		IO = 100 mA, TJ = -40 to 125°C						0.5
VIL	Control input logic low	TJ = -40 to 125°C						0.8	V
VIH	Control input logic high	TJ = -40 to 125°C			2				V
II	Control input current	VI = 6 V, VC = 6 V				10			µA
CO	Output bypass	ESR = 0.1 to 10 Ω, IO = 0 to 100 mA			2	10			µF
	capacitance

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LExxAB, LExxC	Electrical characteristics

Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.

Table 5.	Electrical characteristics for LE30C
Symbol	Parameter	Test conditions			Min.	Typ.	Max.	Unit
VO	Output voltage	IO = 10 mA, VI = 5 V			2.940	3	3.060	V
		IO = 10 mA, VI = 5 V, TJ = -25 to 85°C			2.880		3.120
VI	Operating input voltage	IO = 100 mA					18	V
IO	Output current limit				150			mA
VO	Line regulation	VI = 3.7 to 18 V, IO = 0.5 mA				3	20	mV
VO	Load regulation	VI = 4 V, IO = 0.5 to 100 mA				3	25	mV
		VI = 4 to 18 V, IO = 0 mA		ON mode		0.5	1	mA
Id	Quiescent current	VI = 4 to 18 V, IO = 100 mA				1.5	3
		VI = 6 V		OFF mode		50	100	µA
				f = 120 Hz		81
SVR	Supply voltage rejection	IO = 5 mA, VI = 5 ± 1 V		f = 1kHz		76		dB
				f = 10 kHz		60
eN	Output noise voltage	B = 10 Hz to 100 kHz				50		µV
Vd	Dropout voltage	IO = 100 mA				0.2	0.4	V
		IO = 100 mA, TJ = -40 to 125°C					0.5
VIL	Control input logic low	TJ = -40 to 125°C					0.8	V
VIH	Control input logic high	TJ = -40 to 125°C			2			V
II	Control input current	VI = 6 V, VC = 6 V				10		µA
CO	Output bypass	ESR = 0.1 to 10 Ω, IO = 0 to 100 mA			2	10		µF
	capacitance

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