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ST2L05-3300-ST2L05R3300PT
VERY LOW QUIESCENT CURRENT DUAL VOLTAGE REGULATOR
1/23December 2004 VO1 = 1.5, 1.8, 2.5, 2.8, 3.0, 3.3V FIXED VO2 = 1.5, 1.8, 2.5, 2.8, 3.0, 3.3V FIXED OR
ADJUSTABLE FROM 1.25 TO VI - VDROP GUARANTEED OUTPUT1 CURRENT: 1A GUARANTEED OUTPUT2 CURRENT: 1A ± 2% OUTPUT TOLERANCE (AT 25°C) ± 3% OUTPUT TOLERANCE OVER TEMP. TYPICAL DROPOUT 1.1V (IO1 = IO2 = 1A) INTERNAL POWER AND THERMAL LIMIT STABLE WITH LOW ESR OUTPUT
CAPACITOR OPERATING TEMPERATURE RANGE:
0°C TO 125°C VERY LOW QUIESCENT CURRENT: 7mA
MAX OVER TEMP. AVAILABLE IN SPAK AND IN DFN 5x6mm
PACKAGE
DESCRIPTION Specifically designed for data storage
applications, this device integrates two voltage
regulators, each one able to supply 1A and it is
assembled in SPAK and in a new 8-PIN surface
mounting package named DFN 5x6mm at 8 pins.
The first regulator block supplies 1.5V, 1.8V, 2.5V,
2.8V, 3.0V, 3.3V depending on the chosen
version. The second one may be fixed to the same
values or adjustable from 1.25V to VI - V DROP that
could power several kind of different
micro-controllers. Both outputs are current limited
and over temperature protected. It is worth
underlining the very good thermal performance of
the packages SPAK and DFN with only 2°C/W of
Thermal Resistance Junction to Case.
Applications are HARD DISK, CD/DVD-ROM, CD/
DVD-R/RW, COMBO (DVD-ROM+CD-R/RW).
ST2L05VERY LOW QUIESCENT CURRENT
DUAL VOLTAGE REGULATOR
Figure 1: Block Diagram Of Fixed/adj VersionRev. 6
ST2L052/23
Figure 2: Block Diagram Of Fixed/fixed Version
ST2L053/23
Table 1: Order Codes (*) Available on request.
(1) For Tube Shipment, change "R" with "-" in the relevant ordering code, DFN is available only in Tape & Reel.
ST2L054/23
Table 2: Absolute Maximum Ratings (*) Storage temperatures > 125°C are only acceptable if the Dual Regulator is soldered to a PCBA.
Absolute Maximum Ratings are those beyond which damage to the device may occur. Functional operation under these condition is not im-
plied.
Table 3: Recommended Operating Conditions
Table 4: Thermal Data
Figure 3: Pin Connection (top view for SPAK, top through view for DFN8)
Table 5: Pin Description
ST2L055/23
Figure 4: Application Circuit Of Fixed/fixed Version
Figure 5: Application Circuit Of Fixed/adj Version NOTE: The regulator is designed to be stable with either tantalum or ceramic capacitors on the input and outputs. The expected values of
the input and output X7R ceramic capacitors are from 4.7µF to 22µF with 4.7µF typical. The input capacitor must be connected wi thin 0.5
inches of the VI terminal. The output capacitors must also be connected within 0.5 inches of output pins VO1 and VO2. There is no upper limit
to the size of the input capacitor (for more details see the Application Hints section).
NOTE: In the Fixed/ADJ version, the adjustable output voltage VO2 is designed to support output voltages from 1.25V to VI - VDROP. The
adjustable output voltage VO2 is set by a resistor divider connected between VO2 (pin4) and Ground (pin3) with its centre tap connected to
VO2 ADJ (pin2). The voltage divider resistors are: R1 connected to VO2 and VO2 ADJ and R2 connected to VO2 ADJ and GND. VO2 is deter-
mined by VREF, R1, R2, and IADJ as follows (for more details see the Application Hints section):
VO2 = VREF (1+R1/R2) + IADJR1
ST2L056/23
Table 6: Output1 And Output2 Dual Specification (IO = 10mA to 1A, TJ = 0 to 125°C, VI = 4.5V to 7V, I = 4.7µF, C O1 = CO2 = 4.7μF, otherwise specified)
Table 7: Electrical Characteristics Of Fixed Output 1.5V (IO = 10mA to 1A, TJ = 0 to 125°C,VI = 4.5V to 7V, CI = 4.7µF, C O1 = CO2 = 4.7μF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI = 20µF, C 1 and CO2 = 10µF. C I, CO1 and CO2 are all X7R ceramic capacitors. NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
ST2L057/23
Table 8: Electrical Characteristics Of Fixed Output 1.8V (IO = 10mA to 1A, TJ = 0 to 125°C,I = 4.5V to 7V, CI = 4.7µF, C O1 = CO2 = 4.7μF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI = 20µF, C 1 and CO2 = 10µF. C I, CO1 and CO2 are all X7R ceramic capacitors. NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
ST2L058/23
Table 9: Electrical Characteristics Of Fixed Output 2.5V (IO = 10mA to 1A, TJ = 0 to 125°C,VI = 4.5V to 7V, CI = 4.7µF, C O1 = CO2 = 4.7μF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI = 20µF, C 1 and CO2 = 10µF. C I, CO1 and CO2 are all X7R ceramic capacitors.
NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
ST2L059/23
Table 10: Electrical Characteristics Of Fixed Output 2.8V (IO = 10mA to 1A, TJ = 0 to 125°C,I = 4.5V to 7V, CI = 4.7µF, C O1 = CO2 = 4.7μF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI = 20µF, C 1 and CO2 = 10µF. C I, CO1 and CO2 are all X7R ceramic capacitors. NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
ST2L0510/23
Table 11: Electrical Characteristics Of Fixed Output 3.0V (IO = 10mA to 1A, TJ = 0 to 125°C,I = 4.5V to 7V, CI = 4.7µF, C O1 = CO2 = 4.7μF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI = 20µF, C 1 and CO2 = 10µF. C I, CO1 and CO2 are all X7R ceramic capacitors. NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
ST2L0511/23
Table 12: Electrical Characteristics Of Fixed Output 3.3V (IO = 10mA to 1A, TJ = 0 to 125°C,I = 4.5V to 7V, CI = 4.7µF, C O1 = CO2 = 4.7μF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI = 20µF, C 1 and CO2 = 10µF. C I, CO1 and CO2 are all X7R ceramic capacitors. NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
ST2L0512/23
Table 13: Electrical Characteristics Of Adjustable Output (IO = 10mA to 1A, TJ = 0 to 125°C,I = 4.5V to 7V, CI = 4.7µF, C O1 = CO2 = 4.7μF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI = 20µF, C 1 and CO2 = 10µF. C I, CO1 and CO2 are all X7R ceramic capacitors. NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
APPLICATION HINTSEXTERNAL CAPACITORS
Like any low-dropout regulator, the ST2L05 requires external capacitors for stability. We suggest
soldering both capacitors as close as possible to the relative pins (1, 4 and 5).
INPUT CAPACITOR
An input capacitor, whose value is, at least, 2.2µF is required; the amount of the input capacitance can be
increased without limit if a good quality tantalum or aluminium capacitor is used.SMD X7R or Y5V ceramic
multilayer capacitors could not ensure stability in any condition because of their variable characteristics
with Frequency and Temperature; the use of this capacitor is strictly related to the use of the output
capacitors. For more details read the “OUTPUT CAPACITOR SECTION”.The input capacitor must be
located at a distance of not more than 0.5" from the input pin of the device and returned to a clean analog
ground.
OUTPUT CAPACITOR
The ST2L05 is designed specifically to work with Ceramic and Tantalum capacitors.Special care must be
taken when a Ceramic multilayer capacitor is used.Due to their characteristics they can sometimes have
