ST ST2L05-3300 User Manual

ST2L05-3300

Very low quiescent current dual voltage regulator

Features

■VO1: fixed

■VO2: adjustable from 1.25 to VI - VDROP

■Guaranteed current of output 1: 1 A

■Guaranteed current of output 2: 1 A

■± 2% output tolerance (at 25 °C)

■± 3% output tolerance at overtemperature

■Typical dropout 1.1 V (IO1 = IO2 = 1 A)

■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 overtemperature

■Available in DFN8 5x6 mm package

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.

Applications

■Hard disk drives

■CD/DVD-ROMs

■CD/DVD-R/RWs

■COMBO® (DVD-ROM+CD-R/RW)

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 VI - VDROP, which is suitable for powering 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

			www.st.com

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

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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

3		VI	Bypass with a 4.7 µF capacitor to GND
4		ADJ	Resistor divider connection

8		GND	Ground

5		VO2	Adjustable output voltage: bypass with a 4.7 µF capacitor to GND
7		VO1	Fixed output voltage: bypass with a 4.7 µF capacitor to GND
1, 2, 6		NC	Not connected

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ST2L05-3300	Maximum ratings

3	Maximum ratings
Table 3.	Absolute maximum ratings

Symbol	Parameter	Value	Unit

VI	Operating input voltage	10	V
PD	Power dissipation	Internally limited
IOSH	Short circuit output current - 3.3 V and adjustable output	Internally limited
TOP	Operating junction temperature range	0 to 150	°C
T	Storage temperature range (1)	- 65 to 150	°C
STG
TLEAD	Lead temperature (soldering) 10 sec.	260	°C

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

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

VI	Input voltage			4.5 to 7	V
VI	Input voltage ripple			± 0.15	V
tRISE	Input voltage rise time (from 10% to 90%)			≥ 1	µs
tFALL	Input voltage fall time (from 10% to 90%)			≥ 1	µs
Table 5.		Thermal data

Symbol			Parameter	Value	Unit

RthJC			Thermal resistance junction-case	2	°C/W
RthJA			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)

1.In the fixed / adj. version, the adjustable output voltage VO2 is designed to support output voltages from 1.25 V to VI - VDROP. The adjustable output voltage VO2 is set using a resistor divider connected between VO2 (pin 4) and ground (pin 3) 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 VREF, R1, R2, and IADJ as follows (for more details see the application hints section):

VO2 = VREF (1 + R1 / R2) + IADJR1

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, CO1 = CO2 = 4.7 µF, unless otherwise specified.

Table 6.	Output 1 and output 2 dual specification
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit

IGND	Quiescent current (fixed / adj.)	VI ≤ 7 V, IOUT1,2 = 5 mA to 1 A			5	mA
IST	Total current limit IO1 + IO2		2			A
TSHDN	Thermal shutdown			175		°C
DTSHDN	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, CO1 = CO2 = 4.7 µF, unless otherwise specified.

Table 7.

Electrical characteristics of fixed output 1.5 V

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage 1.5V

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

1.47

1.5

1.53

T = 25°C

Output voltage 1.5V

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

1.455

1.5

1.545

Line regulation

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

Load regulation

VI = 4.75V, IO = 10mA to 1A

Dropout voltage VO = -1%

IO = 1A

1.3

Current limit

VI = 5.5V

IOMIN

Min. output current for

regulation

RMS output noise (1) (5)

T = 25°C

0.003

SVR

Supply voltage

VI = 5V

rejection (2)(5)

Transient response change

VI = 5V, IO = 1mA to 1A, tr ≥ 1µs

10(4)

VO/

of VO with step load

VI = 5V, IO = 1A to 1mA, tf ≥ 1µs

10(4)

change (3)(5)

Transient response change

0 to 5V step input, I = 1mA to 1A,

10(4)

of V

with application

OUT1

tr ≥ 1µs

of VI

(3)(5)

Transient response short

20(4)

circuit removal response

= 5V, I

= short to I = 10mA

(3)(5)

Thermal regulation (5)

= 1A, t

= 30ms

0.1

%/W

PULSE

Temperature stability (5)

0.5

Long-term stability (5)

TJ = 125°C

0.3

(1000hrs)

1.Bandwidth of 10 Hz to 10 kHz.

2.120 Hz input ripple.

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

4.% undershoot or overshoot of VO

5.Guaranteed by design, not tested in production.

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, CO1 = CO2 = 4.7 µF, unless otherwise specified.

Table 8.

Electrical characteristics of fixed output 1.8 V

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage 1.8V

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

1.764

1.8

1.836

T = 25°C

Output voltage 1.8V

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

1.746

1.8

1.854

Line regulation

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

Load regulation

VI = 4.75V, IO = 10mA to 1A

Dropout voltage VO = -1%

IO = 1A

1.3

Current limit

VI = 5.5V

IOMIN

Min. output current for

regulation

RMS output noise (1) (5)

T = 25°C

0.003

SVR

Supply voltage

VI = 5V

rejection (2)(5)

Transient response change

VI = 5V, IO = 1mA to 1A, tr ≥ 1µs

10(4)

VO/

of VO with step load

VI = 5V, IO = 1A to 1mA, tf ≥ 1µs

10(4)

change (3)(5)

Transient response change

0 to 5V step input, I = 1mA to 1A,

10(4)

of V

with application

OUT1

tr ≥ 1µs

of VI

(3)(5)

Transient response short

20(4)

circuit removal response

= 5V, I

= short to I = 10mA

(3)(5)

Thermal regulation (5)

= 1A, t

= 30ms

0.1

%/W

PULSE

Temperature stability (5)

0.5

Long-term stability (5)

TJ = 125°C

0.3

(1000hrs)

1.Bandwidth of 10 Hz to 10 kHz.

2.120 Hz input ripple.

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

4.% undershoot or overshoot of VO

5.Guaranteed by design, not tested in production.

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+ 20 hidden pages

ST ST2L05-3300 User Manual

1 Block diagram

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

2 Pin configuration

Figure 2. Pin connection (top through view)

Maximum ratings

4 Application circuits

Figure 3. Application circuit of fixed / adj. version (1)

5 Electrical characteristics