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 |
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Order codes |
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Part number |
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Packages |
Output voltage |
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SOT323-5L (T&R) |
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SOT23-5L (T&R) (1) |
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STLQ50XX18 |
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STLQ50C18R |
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STLQ50M18R |
Fixed VO = 1.8V |
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STLQ50XX25 |
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STLQ50C25R |
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STLQ50M25R |
Fixed VO = 2.5V |
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STLQ50XX33 |
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STLQ50C33R |
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STLQ50M33R |
Fixed VO = 3.3V |
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STLQ50XX50 |
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STLQ50C50R |
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STLQ50M50R |
Fixed VO = 5.0V |
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STLQ50 |
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STLQ50C-R |
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STLQ50M-R |
Adjustable |
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1. Available upon request. |
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November 2007 |
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Rev. 4 |
1/18 |
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www.st.com |
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STLQ50XX |
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Contents |
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1 |
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . 3 |
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2 |
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . 4 |
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3 |
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . 5 |
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4 |
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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5 |
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . 7 |
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6 |
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . 8 |
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7 |
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . 10 |
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7.1 |
External components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . 10 |
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7.2 |
Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . 10 |
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7.3 |
Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . 11 |
8 |
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . 12 |
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9 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . 17 |
2/18
STLQ50XX
Vin
Vbandgap 1.22V
Fixed
Short circuit & thermal protection
GND
Diagram
Vout |
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ADJ |
Adjustable |
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3/18
Pin configuration |
STLQ50XX |
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ADJ |
OUT |
GND |
STLQ50 |
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N/C |
IN |
Table 2. |
Pin description |
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Pin n° |
Symbol |
Note |
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1 |
ADJ |
STLQ50: output voltage adjust |
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N/C |
STLQ50xx: not connected |
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2 |
GND |
Ground |
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3 |
N/C |
Not connected |
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4 |
IN |
Input voltage |
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5 |
OUT |
Output voltage |
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4/18
STLQ50XX |
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Maximum ratings |
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3 |
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Maximum ratings |
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Table 3. |
Absolute maximum ratings |
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Symbol |
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Parameter |
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Value |
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Unit |
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VI |
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DC Input voltage |
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-0.3 to +14 |
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V |
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VFB |
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FB voltage |
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-0.3 to +7 |
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V |
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ESD |
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Human body model (all pins) |
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±2 |
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kV |
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TJ |
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Junction temperature |
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-40 to 150 |
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°C |
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TSTG |
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Storage temperature range |
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-55 to 150 |
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°C |
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Note: |
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Absolute maximum ratings are those values beyond which damage to the device may occur. |
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Functional operation under these conditions is not implied. |
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Table 4. |
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Thermal data |
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Symbol |
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Parameter |
SOT323-5L |
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SOT23-5L |
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Unit |
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R |
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Thermal resistance junction-ambient |
331.4 (1) |
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191 (1) |
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°C/W |
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thJA |
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1. This value is referred to a 4-layer PCB, JEDEC standard test board.
5/18
Electrical characteristics |
STLQ50XX |
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4 |
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Electrical characteristics |
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Table 5. |
Electrical characteristics |
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(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 |
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are at TA = 25 °C, CO = 1 µF unless otherwise specified) |
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Symbol |
Parameter |
Test conditions |
Min. |
Typ. |
Max. |
Unit |
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VI |
Input voltage range |
IO=20mA |
2.3 |
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12 |
V |
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IO=50mA |
2.5 |
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12 |
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IQ |
Quiescent current (Measured on |
VI=5V |
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3.5 |
5.0 |
µA |
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ground pin, fixed version) |
VI=12V |
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4.1 |
6.0 |
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Output voltage range (STLQ50ADJ) |
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1.222 |
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11 |
V |
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VO |
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Accuracy as percentage of nominal |
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-2 |
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+2 |
% |
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voltage at TJ=25°C |
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V |
DROP-MAX |
Max dropout voltage (1) |
I =50mA; |
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0.4 |
0.7 |
V |
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O |
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VO |
Load regulation |
1mA < IO <50mA |
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0.15 |
%/mA |
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VO=1.5V: |
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VO |
Line regulation |
VO+1V < VI <12V; |
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0.3 |
%/V |
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VO=1.5V: |
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2.5V < VI <12V; |
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SVR |
Supply voltage rejection |
VRIPPLE = 0.1V, IO= 20mA |
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30 |
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dB |
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f=120Hz |
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eN |
Output noise voltage |
BW from 200Hz to |
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560 |
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µVRMS |
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100KHZ; IO=10mA |
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Th |
Thermal protection |
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160 |
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°C |
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I |
OMAX |
Maximum output current (2) |
V =0V |
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500 |
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mA |
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O |
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1.VI=2.5V when VO(NOM) ≤2.1V
2.The maximum power dissipation must not be exceeded, see application information for details.
6/18