ST STLQ50C18R, STLQ50M18R, STLQ50C25R, STLQ50M25R, STLQ50C33R User Manual

STLQ50XX

50 mA, 3 µA supply current low drop linear regulator

Features

■2.3 V to 12 V input voltage range

■50 mA maximum output current

■3 µA quiescent current

■Available in 1.8 V, 2.5 V, 3.3 V, 5.0 V and adjustable

■200 mV dropout voltage at 25 mA output current

■Internal thermal protection

■Available in SOT323-5L package, and SOT235L package (upon request)

Applications

■Portable/battery powered equipments

■Electronic sensors

■Microcontroller power

■Real time clock backup power

SOT23-5L

SOT323-5L

(available on request)

Description

The STLQ50 is a BiCMOS linear regulator specifically designed for operating in environment with very low power consumption constraints.

Due to the very low quiescent current (3 µA) the device is suitable for those application that have very long stand-by time allowing extension of battery life.

The P-MOS pass element allows also a very good drop-out figure (200 mV at 25 mA IO and 350 mV at full load) without affecting the consumption characteristics.

Housed in the very small SOT323-5L or SOT235L, it fulfils the space saving requirements in battery powered equipments.

Table 1.	Device summary
			Order codes
Part number				Packages		Output voltage
			SOT323-5L (T&R)		SOT23-5L (T&R) (1)
STLQ50XX18			STLQ50C18R		STLQ50M18R	Fixed VO = 1.8V
STLQ50XX25			STLQ50C25R		STLQ50M25R	Fixed VO = 2.5V
STLQ50XX33			STLQ50C33R		STLQ50M33R	Fixed VO = 3.3V
STLQ50XX50			STLQ50C50R		STLQ50M50R	Fixed VO = 5.0V
	STLQ50		STLQ50C-R		STLQ50M-R	Adjustable
1. Available upon request.
November 2007				Rev. 4		1/18
						www.st.com

			STLQ50XX
	Contents
1	Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . 3
2	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . 4
3	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . 5
4	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . 6
5	Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . 7
6	Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . . 8
7	Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . 10
	7.1	External components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . 10
	7.2	Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . 10
	7.3	Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . 11
8	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . 12
9	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . 17

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STLQ50XX

1 Diagram

Figure 1. Block diagram

Vin

Vbandgap 1.22V

Fixed

Short circuit & thermal protection

GND

Diagram

Vout
ADJ	Adjustable

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Pin configuration	STLQ50XX

2 Pin configuration

Figure 2. Pin connections (top view)

ADJ	OUT
GND	STLQ50
N/C	IN

	Table 2.	Pin description
	Pin n°	Symbol	Note
	1	ADJ	STLQ50: output voltage adjust
		N/C	STLQ50xx: not connected
	2	GND	Ground
	3	N/C	Not connected
	4	IN	Input voltage
	5	OUT	Output voltage

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STLQ50XX							Maximum ratings
3		Maximum ratings
Table 3.	Absolute maximum ratings
Symbol			Parameter			Value			Unit
VI			DC Input voltage		-0.3 to +14					V
VFB			FB voltage		-0.3 to +7					V
ESD			Human body model (all pins)			±2				kV
TJ			Junction temperature		-40 to 150					°C
TSTG			Storage temperature range		-55 to 150					°C
Note:		Absolute maximum ratings are those values beyond which damage to the device may occur.
		Functional operation under these conditions is not implied.
Table 4.		Thermal data
Symbol			Parameter	SOT323-5L			SOT23-5L			Unit
R		Thermal resistance junction-ambient		331.4 (1)			191 (1)			°C/W
thJA

1. This value is referred to a 4-layer PCB, JEDEC standard test board.

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Electrical characteristics	STLQ50XX

4			Electrical characteristics
Table 5.			Electrical characteristics
			(VI = VO(NOM) +1 V or VI = 2.5 V if VO + 1.5 V; TA= -40 °C to 125 °C; IO = 1 mA; typical values
			are at TA = 25 °C, CO = 1 µF unless otherwise specified)
	Symbol		Parameter	Test conditions	Min.	Typ.	Max.	Unit
		VI	Input voltage range	IO=20mA	2.3		12	V
				IO=50mA	2.5		12
		IQ	Quiescent current (Measured on	VI=5V		3.5	5.0	µA
			ground pin, fixed version)	VI=12V		4.1	6.0
			Output voltage range (STLQ50ADJ)		1.222		11	V
		VO
			Accuracy as percentage of nominal		-2		+2	%
			voltage at TJ=25°C
V	DROP-MAX		Max dropout voltage (1)	I =50mA;		0.4	0.7	V
				O
		VO	Load regulation	1mA < IO <50mA			0.15	%/mA
				VO=1.5V:
		VO	Line regulation	VO+1V < VI <12V;			0.3	%/V
				VO=1.5V:
				2.5V < VI <12V;
		SVR	Supply voltage rejection	VRIPPLE = 0.1V, IO= 20mA		30		dB
				f=120Hz
		eN	Output noise voltage	BW from 200Hz to		560		µVRMS
				100KHZ; IO=10mA
		Th	Thermal protection			160		°C
	I	OMAX	Maximum output current (2)	V =0V		500		mA
				O

1.VI=2.5V when VO(NOM) ≤2.1V

2.The maximum power dissipation must not be exceeded, see application information for details.

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