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

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 SOT23-

5L package (upon request)

Applications

■ Portable/battery powered equipments

■ Electronic sensors

■ Microcontroller power

■ Real time clock backup power

STLQ50XX

SOT323-5L

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 I
at full load) without affecting the consumption
characteristics.

SOT23-5L

(available on request)

and 350 mV

O

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

SOT323-5L (T&R) SOT23-5L (T&R)

STLQ50XX18 STLQ50C18R STLQ50M18R Fixed VO = 1.8V

STLQ50XX25 STLQ50C25R STLQ50M25R Fixed V

STLQ50XX33 STLQ50C33R STLQ50M33R Fixed V

STLQ50XX50 STLQ50C50R STLQ50M50R Fixed V

STLQ50 STLQ50C-R STLQ50M-R Adjustable

1. Available upon request.

November 2007 Rev. 4 1/18

(1)

Output voltagePackages

= 2.5V

O

= 3.3V

O

= 5.0V

O

www.st.com

18

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 Diagram

1 Diagram

Figure 1. Block diagram

Vin

V bandgap

1.22V

Vout

Adjustable

Fixed

ADJ

Short circuit &

thermal

protection

GND

3/18

Pin configuration STLQ50XX

2 Pin configuration

Figure 2. Pin connections (top view)

ADJ

ADJ

STLQ50

GND

GND

N/C

N/C

Table 2. Pin description

Pin n° Symbol Note

1

2 GND Ground

3 N/C Not connected

4 IN Input voltage

5 OUT Output voltage

ADJ STLQ50: output voltage adjust

N/C STLQ50xx: not connected

STLQ50

OUT

OUT

IN

IN

4/18

STLQ50XX Maximum ratings

3 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

I

V

FB

DC Input voltage -0.3 to +14 V

FB voltage -0.3 to +7 V

ESD Human body model (all pins) ±2 kV

T

T

J

STG

Junction temperature -40 to 150 °C

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

thJA

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

Thermal resistance junction-ambient 331.4

(1)

191

(1)

°C/W

5/18

Electrical characteristics STLQ50XX

4 Electrical characteristics

Table 5. Electrical characteristics

(V

= V

I

O(NOM)

are at T

Symbol Parameter Test conditions Min. Typ. Max. Unit

+1 V or VI = 2.5 V if VO + 1.5 V; TA= -40 °C to 125 °C; IO = 1 mA; typical values

= 25 °C, CO = 1 µF unless otherwise specified)

A

V

I

Q

Input voltage range

I

Quiescent current (Measured on
ground pin, fixed version)

=50mA 2.5 12

I

O

=5V 3.5 5.0

V

I

=12V 4.1 6.0

V

I

Output voltage range (STLQ50ADJ) 1.222 11 V

IO=20mA 2.3 12

V

O

Accuracy as percentage of nominal

=25°C

J

V

DROP-MAX

ΔV

ΔV

voltage at T

Max dropout voltage

Load regulation 1mA < IO <50mA 0.15 %/mA

O

Line regulation

O

SVR Supply voltage rejection

eN Output noise voltage

(1)

IO=50mA; 0.4 0.7 V

=1.5V:

V

O

VO+1V < VI <12V;
VO=1.5V:

2.5V < V

V

RIPPLE

<12V;

I

= 0.1V, IO= 20mA

f=120Hz

from 200Hz to

B

W

100KHZ; IO=10mA

-2 +2 %

30 dB

560 µV

Th Thermal protection 160 °C

I

OMAX

1. VI=2.5V when V

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

Maximum output current

≤ 2.1V

O(NOM)

(2)

VO=0V 500 mA

V

µA

0.3 %/V

RMS

6/18