ST ST2L05-3300 User Manual

Features

ST2L05-3300

Very low quiescent current dual voltage regulator

■ V

■ V

■

■ Guaranteed current of output 2: 1 A

■ ± 2% output tolerance (at 25 °C)

■ ± 3% output tolerance at overtemperature

■ Typical dropout 1.1 V (I

■ Internal power and thermal limit

■ Good stability with low ESR output capacitor

■ Operating temperature range: 0 °C to 125 °C

■ Very low quiescent current: 7 mA max

: fixed

O1

: adjustable from 1.25 to VI - V

O2

Guaranteed current of output 1: 1 A

= IO2 = 1 A)

O1

DROP

overtemperature

■ Available in DFN8 5x6 mm package

Applications

■ Hard disk drives

■ CD/DVD-ROMs

■ CD/DVD-R/RWs

■ COMBO

®

(DVD-ROM+CD-R/RW)

DFN8 (5x6 mm)

and overtemperature protected. Also noteworthy
is the very good thermal performance of the DFN
package, with only 2 °C/W of thermal resistance
junction-to-case.

Description

Specifically designed for data storage
applications, this device integrates two voltage
regulators, each capable of supplying 1 A of
current. It is assembled in an 8-pin DFN8 5x6 mm
surface mounting package. One regulator block
supplies 3.3 V and, on request, 1.5 V, 1.8 V, 2.5 V,

2.8 V and 3.0 V. The other is adjustable from 1.25
V to V

- V

I

several different types of microcontroller. Both
outputs are current-limited

Table 1. Device summary

Order code Package Output voltage

ST2L05R3300PS DFN8 (5x6 mm) Adjustable

February 2009 Rev 7 1/29

, which is suitable for powering

DROP

www.st.com

29

Contents ST2L05-3300

Contents

1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.1 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.2 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.3 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.4 Adjustable regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

9 Different output voltage versions of the ST2L05-3300

available on request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

2/29

ST2L05-3300 Block diagram

1 Block diagram

Figure 1. Block diagram of the fixed / adjustable output version of the ST2L05-3300

3/29

Pin configuration ST2L05-3300

2 Pin configuration

Figure 2. Pin connection (top through view)

Table 2. Pin description

Pin n° Symbol Name and function

3V

I

Bypass with a 4.7 µF capacitor to GND

4 ADJ Resistor divider connection

8 GND Ground

5V

7V

O2

O1

Adjustable output voltage: bypass with a 4.7 µF capacitor to GND

Fixed output voltage: bypass with a 4.7 µF capacitor to GND

1, 2, 6 NC Not connected

4/29

ST2L05-3300 Maximum ratings

3 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

P

I

OSH

T

T

STG

T

LEAD

1. Storage temperatures > 125°C are only acceptable if the dual regulator is soldered to a PCBA.

Operating input voltage 10 V

I

Power dissipation Internally limited

D

Short circuit output current - 3.3 V and adjustable output Internally limited

Operating junction temperature range 0 to 150 °C

OP

Storage temperature range

(1)

- 65 to 150 °C

Lead temperature (soldering) 10 sec. 260 °C

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these condition is not implied.

Table 4. Recommended operating conditions

Symbol Parameter Value Unit

V

ΔV

t

RISE

t

FAL L

Input voltage 4.5 to 7 V

I

Input voltage ripple ± 0.15 V

I

Input voltage rise time (from 10% to 90%) ≥ 1µs

Input voltage fall time (from 10% to 90%) ≥ 1µs

Table 5. Thermal data

Symbol Parameter Value Unit

R

thJC

R

thJA

Thermal resistance junction-case 2 °C/W

Thermal resistance junction-ambient 36 °C/W

5/29

Application circuits ST2L05-3300

4 Application circuits

Figure 3. Application circuit of fixed / adj. version

1. In the fixed / adj. version, the adjustable output voltage V
V

. The adjustable output voltage VO2 is set using a resistor divider connected between VO2 (pin 4) and ground (pin 3)

DROP

with its center tap connected to VO2 ADJ (pin 2). The voltage divider resistors are: R1 connected to VO2 and VO2 ADJ and
R2 connected to VO2 ADJ and GND. VO2 is determined by V
application hints section):
V

= V

O2

(1 + R1 / R2) + I

REF

ADJR1

O2

(1)

is designed to support output voltages from 1.25 V to VI -

, R1, R2, and I

REF

as follows (for more details see the

ADJ

6/29

ST2L05-3300 Electrical characteristics

5 Electrical characteristics

IO = 10 mA to 1 A, TJ = 0 to 125 °C, VI = 4.5 V to 7 V, CI = 4.7 µF, C

O1

= C

= 4.7 µF, unless

O2

otherwise specified.

Table 6. Output 1 and output 2 dual specification

Symbol Parameter Test conditions Min. Typ. Max. Unit

I

GND

I

ST

T

SHDN

DT

SHDN

Quiescent current (fixed / adj.) VI ≤ 7 V, I

Total current limit I

O1

+ I

O2

= 5 mA to 1 A 5 mA

OUT1,2

2A

Thermal shutdown 175 °C

Thermal shutdown hysteresis 5 °C

7/29

Electrical characteristics ST2L05-3300

IO = 10 mA to 1 A, TJ = 0 to 125 °C, VI = 4.5 V to 7 V, CI = 4.7 µF, C

O1

= C

= 4.7 µF, unless

O2

otherwise specified.

Table 7. Electrical characteristics of fixed output 1.5 V

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

O

V

O

ΔV

O

ΔV

O

V

D

I

S

I

OMIN

e

N

SVR

ΔVO/ΔI

ΔVO1/ΔV

ΔV

/ΔI

O

T

R

S Temperature stability

S

= 5mA to 1A, VI = 4.75 to 5.25V

I

Output voltage 1.5V

O

T = 25°C

1.47 1.5 1.53 V

Output voltage 1.5V IO = 5mA to 1A, VI = 4.75 to 5.25V 1.455 1.5 1.545 V

Line regulation VI = 4.75 to 5.25V, IO = 5mA to 1A 15 mV

Load regulation VI = 4.75V, IO = 10mA to 1A 12 mV

Dropout voltage ΔVO = -1% IO = 1A 1.3 V

Current limit VI = 5.5V 1 A

Min. output current for
regulation

RMS output noise

Supply voltage
rejection

(2)(5)

Transient response change
of VO with step load

O

change

(3)(5)

Transient response change
of V

I

of V

with application

OUT1

(3)(5)

I

Transient response short
circuit removal response

O

(3)(5)

Thermal regulation

Long-term stability
(1000hrs)

(1) (5)

(5)

(5)

(5)

T = 25°C 0.003 %

VI = 5V 60 dB

VI = 5V, IO = 1mA to 1A, tr ≥ 1µs 10

= 5V, IO = 1A to 1mA, tf ≥ 1µs 10

V

I

0 to 5V step input, IO = 1mA to 1A,
tr ≥ 1µs

VI = 5V, IO = short to IO = 10mA 20

IO = 1A, t

= 30ms 0.1 %/W

PULSE

0.5 %

= 125°C 0.3 %

T

J

0mA

(4)

(4)

(4)

10

(4)

%

%

%

1. Bandwidth of 10 Hz to 10 kHz.

2. 120 Hz input ripple.

= 20 µF, CO1 and CO2 = 10 µF. CI, CO1 and CO2 are all X7R ceramic capacitors.

3. C

I

4. % undershoot or overshoot of V

5. Guaranteed by design, not tested in production.

O

8/29

ST2L05-3300 Electrical characteristics

IO = 10 mA to 1 A, TJ = 0 to 125 °C, VI = 4.5 V to 7 V, CI = 4.7 µF, C

O1

= C

= 4.7 µF, unless

O2

otherwise specified.

Table 8. Electrical characteristics of fixed output 1.8 V

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

O

V

O

ΔV

O

ΔV

O

V

D

I

S

I

OMIN

e

N

SVR

ΔVO/ΔI

ΔVO1/ΔV

ΔV

/ΔI

O

T

R

S Temperature stability

S

= 5mA to 1A, VI = 4.75 to 5.25V

I

Output voltage 1.8V

O

T = 25°C

1.764 1.8 1.836 V

Output voltage 1.8V IO = 5mA to 1A, VI = 4.75 to 5.25V 1.746 1.8 1.854 V

Line regulation VI = 4.75 to 5.25V, IO = 5mA to 1A 15 mV

Load regulation VI = 4.75V, IO = 10mA to 1A 12 mV

Dropout voltage ΔVO = -1% IO = 1A 1.3 V

Current limit VI = 5.5V 1 A

Min. output current for
regulation

RMS output noise

Supply voltage
rejection

(2)(5)

Transient response change
of VO with step load

O

change

(3)(5)

Transient response change
of V

I

of V

with application

OUT1

(3)(5)

I

Transient response short
circuit removal response

O

(3)(5)

Thermal regulation

Long-term stability
(1000hrs)

(1) (5)

(5)

(5)

(5)

T = 25°C 0.003 %

VI = 5V 60 dB

VI = 5V, IO = 1mA to 1A, tr ≥ 1µs 10

= 5V, IO = 1A to 1mA, tf ≥ 1µs 10

V

I

0 to 5V step input, IO = 1mA to 1A,
tr ≥ 1µs

VI = 5V, IO = short to IO = 10mA 20

IO = 1A, t

= 30ms 0.1 %/W

PULSE

0.5 %

= 125°C 0.3 %

T

J

0mA

(4)

(4)

(4)

10

(4)

%

%

%

1. Bandwidth of 10 Hz to 10 kHz.

2. 120 Hz input ripple.

= 20 µF, CO1 and CO2 = 10 µF. CI, CO1 and CO2 are all X7R ceramic capacitors.

3. C

I

4. % undershoot or overshoot of V

5. Guaranteed by design, not tested in production.

O

9/29