ST ST2S06A33, ST2S06B User Manual

ST2S06A33

ST2S06B

Dual synchronous rectification with reset or inhibit, 0.5 A, 1.5 MHz

adjustable step-down switching regulator

Datasheet − production data

Features

■ Step-down current mode PWM (1.5 MHz) DC-

DC converter

■ Fixed or adjustable output voltage from 0.8 V

■ 2% DC output voltage tolerance

■ Synchronous rectification

■ Reset function for A version

■ Inhibit function for B version

■ Internal soft start for startup current limitation

and power ON delay of 50-100 µs

■ Typical efficiency: > 90%

■ 0.5 A output current capability

■ Non-switching quiescent current: max 1.2 mA

over temperature range

■ R

■ Uses tiny capacitors and inductors

■ Available in QFN12L (4x4 mm)

DS(ON)

150 mΩ (typ.)

mode PWM topology and the utilization of low
ESR SMD ceramic capacitors. The devices are
thermally protected and current-limited to prevent
damage due to accidental short-circuit. The
ST2S06A33 and ST2S06B are available in the
QFN12L (4x4 mm) package.

QFN12L (4 x 4 mm)

Description

The ST2S06A33 and ST2S06B are dual step­down DC-DC converters optimized for powering
low-voltage digital cores in ODD applications and,
generally, to replace high current linear solutions
when the power dissipation may cause high
heating of the application environment. It provides
up to 0.5 A over an input voltage range of 2.5 V to

5.5 V.

A high switching frequency of 1.5 MHz allows the
use of tiny surface-mount components as well as
a resistor divider to set the output voltage value.
Only an inductor and two capacitors are required.
A low output ripple is guaranteed by the current

Table 1. Device summary

Order code Package Packaging

ST2S06A33PQR

ST2S06BPQR

May 2012 Doc ID 13866 Rev 5 1/18

This is information on a product in full production.

QFN12L (4 x 4 mm) Tape and reel

www.st.com

18

Contents ST2S06A33, ST2S06B

Contents

1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

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

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2/18 Doc ID 13866 Rev 5

ST2S06A33, ST2S06B Schematic diagram

1 Schematic diagram

Figure 1. Schematic diagram

RESET_OUT *

RESET_OUT *

HV

HV

Delay

Delay

Trimming

Trimming

Ref

Ref

VI_A

VI_A

VI_SW

VI_SW

SW

SW

FB1

FB1

FB2

FB2

Ref

Ref

* ST2S06A33

** ST2S06B

Soft Start

Soft Start

GND

GND

CONTROL

CONTROL

LOGIC

LOGIC

INH**

INH**

VI_SW

VI_SW

GND

GND

SW2

SW2

Doc ID 13866 Rev 5 3/18

Pin configuration ST2S06A33, ST2S06B

2 Pin configuration

Figure 2. Pin connections (top view)

Table 2. Pin description

Pin n° ST2S06A33 ST2S06B Name and function

1 HV HV Programing pin. It must be floating or connected to GND.

2 FB2 FB2 Feedback voltage

3 GND2 GND2 Power ground

4 SW2 SW2 Switching pin

5 VIN_SW VIN_SW Power input voltage pin

6 SW1 SW1 Switching pin

7 GND1 GND1 Power ground

8 FB1/OUT1 FB1 Feedback voltage / output voltage

9 Reset_out NC Reset out pin

10 NC INH Inhibit pin

11 VIN_A VIN_A Supply for analog circuit

12 GND_A GND_A System ground

4/18 Doc ID 13866 Rev 5

ST2S06A33, ST2S06B Maximum ratings

3 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

IN_SW

V

V

IN_A

INH

Positive power supply voltage -0.3 to 7 V

Positive power supply voltage -0.3 to 7 V

Inhibit voltage -0.3 to 7 V

SWITCH voltage Max. voltage of output pin -0.3 to 7 V

V

FB1,2/VO1

V

O1

Current into VFB

pin

T

J

T

STG

T

LEAD

Feedback voltage/output voltage -0.3 to 2.5 V

Output voltage (for VO > 1.6 V) -0.3 to 5 V

Common mode input voltage +1 to -1 mA

Max junction temperature 150 °C

Storage temperature range -65 to +150 °C

Lead temperature (soldering) 10 sec. 300 °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 Value Unit

R

thJC

R

thJA

Thermal resistance junction-case 10 °C/W

Thermal resistance junction-ambient 60 °C/W

Table 5. ESD performance

Symbol Parameter Test conditions Value Unit

ESD ESD protection voltage HBM-DH11C 4 kV

Doc ID 13866 Rev 5 5/18

Electrical characteristics ST2S06A33, ST2S06B

4 Electrical characteristics

V
µH, T

Table 6. Electrical characteristics for the ST2S06A33

= V

IN_SW

= - 30 to 125 °C unless otherwise specified. Typical values are referred to 25 °C.

J

IN_A

= 5 V, V

= 3.3 V, V

01

= 1.2 V, C1 = 4.7 µF, C2 = C3 = 22 µF, L1 = L2 = 3.3

O2

Symbol Parameter Test conditions Min. Typ. Max. Unit

OUT

FB

I

O1

I

FB2

I

Q

I

O1,2

I

MIN

%V

O1,2

N

ΔV

O1,2

PWM f

D

MAX

I

SWL

I

LKN

I

LKP

R

DSon

R

DSon

η Efficiency

T

SHDN

T

HYS

Output feedback pin 3.23 3.3 3.37 V

1

Feedback voltage 784 800 816 mV

2

I

pin bias current VO = 3.5 V 1520µA

O1

VFB pin bias current V

Quiescent current V

Output current VIN = 4 to 5.5 V

= 1 V 600 nA

FB

= 1 V 1.2 mA

FB

(1)

0.8 A

Minimum output current 1 mA

/ΔV

I

Reference line regulation 4V < V

< 5.5 V 0.032

IN

Reference load regulation 10mA < IO < 0.5 A 5.5 15 mV

PWM switching

S

frequency

(1)

Maximum duty cycle V

V

= 0.7 V, TA = 25°C 1.2 1.5 1.8 MHz

FB

= 0.7 V, TA = 25°C 85 94 %

FB

Switching current limitation 1 1.2 A

NMOS leakage current V

PMOS leakage current V

-N NMOS switch on resistance I

-P PMOS switch on resistance I

Thermal shut down

Thermal shut down
hysteresis

(2)

(2)

= 0.9 V, TA = 25°C 0.1 µA

FB

= 0.9 V, TA = 25°C 0.1 µA

FB

= 250 mA 0.15 0.3 Ω

SW

= 250 mA 0.2 0.4 Ω

SW

= 20 mA to 100 mA 75 %

I

O

I

= 100 mA to 0.5 A 90 %

O

130 150 °C

15 °C

%V

V

/

O

IN

100 mA < IO < 500 mA

ΔV

/ΔIOLoad transient response

O1,2

(2)

t

= tF => 100 ns, TA = 25°C

R

Reset section

t

DEL

V

RES

1. VO= 90% of nominal value.

2. Guaranteed by design, but not tested in production.

Delay time TA = 25°C 80 85 ms

V

Rising 4.5 4.6 4.75

Reset in threshold
measured on input pin

IN_A

V

Falling 4.12 4.2 4.28

IN_A

6/18 Doc ID 13866 Rev 5

-5 +5 %V

O

V

ST2S06A33, ST2S06B Electrical characteristics

V
T

Table 7. Electrical characteristics for the ST2S06B

= V

IN_SW

= -30 to 125 °C unless otherwise specified. Typical values are referred to 25 °C.

J

IN_A

= 5 V, V

=1.2 V, C1= 4.7 µF, C2 = C3 = 22 µF, L1 = L2 = 3.3 µH,

O1,2

Symbol Parameter Test conditions Min. Typ. Max. Unit

1,2

Feedback voltage 784 800 816 mV

VFB pin bias current V

Quiescent current

Output current VIN = 2.5 to 5.5 V

= 1 V 600 nA

FB

V

> 1.2 V, V

INH

V

< 0.4 V 1 µA

INH

= 1 V 1 mA

FB

(1)

0.8 A

Minimum output current 1 mA

< 5 V 1.2

IN

< 5.5 V 1.3

IN

Inhibit threshold

2.5V < V

2.5V < V

FB

I

FB1,2

I

Q

I

O1,2

I

MIN

V

INH

Device OFF 0.4

I

INH1,2

%V

O1,2

ΔV

ΔV

O1,2

PWM f

Inhibit pin current 2 µA

/

Reference line regulation 2.5V < V

IN

< 5.5 V 0.032

IN

Reference load regulation 10 mA < IO < 0.5 A 5.5 15 mV

PWM switching

S

frequency

(1)

V

= 0.7 V, TA = 25°C 1.2 1.5 1.8 MHz

FB

%V

V

V

/

O

IN

D

MAX

I

SWL

I

LKN

I

LKP

R

DSon

R

DSon

η Efficiency

T

SHDN

T

HYS

ΔV

O1,2

1. VO= 90% of nominal value.

2. Guaranteed by design, but not tested in production.

Maximum duty cycle V

FB

Switching current limitation 1 1.2 A

NMOS leakage current V

PMOS leakage current V

-N NMOS switch on resistance I

-P PMOS switch on resistance I

Thermal shut down

Thermal shut down
hysteresis

(1)

(2)

/ΔIOLoad transient response

FB

FB

SW

SW

I

= 20 mA to 100 mA 75 %

O

I

= 100 mA to 0.5 A 90 %

O

100 mA < IO < 500 mA,

(1)

= tF1 => 100 ns, TA = 25°C

t

R

= 0.7 V, TA = 25°C 85 94 %

= 0.9 V, TA = 25°C 0.1 µA

= 0.9 V, TA = 25°C 0.1 µA

= 250 mA 0.15 0.3 Ω

= 250 mA 0.2 0.4 Ω

130 150 °C

15 °C

-5 +5 %V

O

Doc ID 13866 Rev 5 7/18

Typical performance characteristics ST2S06A33, ST2S06B

5 Typical performance characteristics

Figure 3. Feedback voltage 1 vs. temperature

0.82

0.82

0.81

0.81

[V]

[V]

0.8

0.8

FB1

FB1

V

V

0.79

0.79

0.78

0.78

Figure 5. Efficiency vs. output current 1 Figure 6. Efficiency vs. output current 2

100

100

95

95
90

90

85

85
80

80

75

75
70

70

EFFICIENCY [%]

EFFICIENCY [%]

65

65
60

60

(ST2S06B)

VI=5V, V

connected to V

VI=5V, V

connected to V

FB1

FB1

IO1=IO2=NO LOAD

IO1=IO2=NO LOAD

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

0 0.1 0.2 0.3 0.4 0.5 0.6

0 0.1 0.2 0.3 0.4 0.5 0.6

O1

O1

TEMPERATURE [°C]

TEMPERATURE [°C]

VI=5V, VO1=3.3V, I

VI=5V, VO1=3.3V, I

Output Current 1 [A]

Output Current 1 [A]

NO LOAD

NO LOAD

O2

O2

Figure 4. Feedback voltage 2 vs. temperature

(ST2S06B)

0.82

0.82

0.82

VI=5V, V

connected to V

VI=5V, V

connected to V

FB2

FB2

IO1=I

=NO LOAD

IO1=I

=NO LOAD

O2

0.81

0.81

0.81

[V]

[V]

[V]

0.8

0.8

0.8

FB2

FB2

FB2

V

V

V

0.79

0.79

0.79

0.78

0.78

0.78

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

100

100

95

95
90

90
85

85
80

80
75

75
70

70
65

65
60

60
55

55

EFFICIENCY [%]

EFFICIENCY [%]

50

50
45

45
40

40

0 0.1 0.2 0.3 0.4 0.5 0.6

0 0.1 0.2 0.3 0.4 0.5 0.6

O2

VI=5V, VO2=1.2V, IO1NO LOAD

VI=5V, VO2=1.2V, IO1NO LOAD

O2

O2

TEMPERATURE [°C]

TEMPERATURE [°C]

TEMPERATURE [°C]

Output Current 2 [A]

Output Current 2 [A]

Figure 7. Switching frequency vs.

1.9

1.9

1.8

1.8

1.7

1.7

1.6

1.6

1.5

1.5

1.4

1.4

1.3

1.3

Frequency [MHz]

Frequency [MHz]

1.2

1.2

1.1

1.1

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

temperature (ST2S06A33)

VI=5V, V

=3.2V, V

=3.2V, V

=0.7V

=0.7V

FB2

FB2

Temperature [°C]

Temperature [°C]

VI=5V, V

FB1

FB1

Figure 8. Duty cycle vs. temperature

100

100

99

99
98

98
97

97
96

96
95

95
94

94
93

93

Duty Cycle [%]

Duty Cycle [%]

92

92
91

91
90

90

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

8/18 Doc ID 13866 Rev 5

(ST2S06A33)

VI=5V, V

=3.2V, V

VI=5V, V

=3.2V, V

FB1

FB1

=0.7V

=0.7V

FB2

FB2

Temperature [°C]

Temperature [°C]

ST2S06A33, ST2S06B Typical performance characteristics

Figure 9. Switching frequency vs.

1.9

1.9

1.8

1.8

1.7

1.7

1.6

1.6

1.5

1.5

1.4

1.4

1.3

1.3

Frequency [MHz]

Frequency [MHz]

1.2

1.2

1.1

1.1

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

temperature (ST2S06B)

Temperature [°C]

Temperature [°C]

Figure 11. Switching current limitation vs.

2

2

1.8

1.8

1.6

1.6

[A]

[A]

1.4

1.4

SW2

SW2

I

I

1.2

1.2

1

1

2.5 3 3.5 4 4.5 5 5.5

2.5 3 3.5 4 4.5 5 5.5

input voltage (ST2S06A33)

VIfrom 2.5V to 5.5V, Output 2 Maximum load Current

VIfrom 2.5V to 5.5V, Output 2 Maximum load Current

V

V

[V]

[V]

I

I

Figure 10. Inhibit threshold vs. temperature

(ST2S06B)

1.4

1.4

1.2

1.2

1

1

0.8

0.8

(V)

(V)

INH

INH

0.6

0.6

V

V

0.4

0.4

0.2

0.2

0

0

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

T [C°]

T [C°]

VI=5V, IO1=IO2=100mA

VI=5V, IO1=IO2=100mA

ON

ON

OFF

OFF

Figure 12. PMOS switch on resistance vs.

temperature

240

240

220

220

200

200

180

180

-P[mOhm]

-P[mOhm]

160

160

140

140

DSON

DSON

R

R

120

120

100

100

VCC=5V, ISW=250mA

VCC=5V, ISW=250mA

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

T [°C]

T [°C]

Figure 13. NMOS switch on resistance vs.

170

170

150

150

130

130

110

110

-N[mOhm]

-N[mOhm]

90

90

DSON

DSON

R

R

70

70

50

50

temperature

VCC=5V, I

VCC=5V, I

-50-250 255075100125

-50-250 255075100125

T [°C]

T [°C]

250mA

250mA

SW=

SW=

Doc ID 13866 Rev 5 9/18

Figure 14. Delay time vs. temperature

(ST2S06A33)

V

I

V

RES

VI Rising from 0V to 5V, Delay from V

reset pin below 0V.

threshold and

RES

Typical performance characteristics ST2S06A33, ST2S06B

Figure 15. Delay time vs. temperature

100

100

95

95
90

90
85

85
80

80

(ms)

(ms)

75

75

DEL

DEL

70

70

T

T

65

65
60

60
55

55
50

50

(ST2S06A33)

VIRising from 0V to 5V

VIRising from 0V to 5V

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

T [C°]

T [C°]

Figure 17. Load transient response

V

O1

(ST2S06A33)

Figure 16. Reset in threshold vs. temperature

(ST2S06A33)

5

5

4.9

4.9

4.8

4.8

4.7

4.7

4.6

4.6

(V)

(V)

4.5

4.5

RES

RES

4.4

4.4

V

V

4.3

4.3

4.2

4.2

4.1

4.1
4

4

-50 -25 0 25 50 75 100 125

-50 -25 0 25 50 75 100 125

Rising

Rising

Falling

Falling

T [C°]

T [C°]

Figure 18. Startup transient (ST2S06A33)

V

I

V

O1

I

O1

VI= 5V, IO1 from 100mA to 500mA

Figure 19. Startup transient (ST2S06B) Figure 20. Inhibit transient (ST2S06B)

I

O1

V

I

V

O1

VI= from 0V to 5V, IO1 =1A, Output Voltage=1.2V

VI= from 0V to 5V, IO1=500mA, Output Voltage=3.3V

V

INH

V

O1

V

O2

V

= from 0V to 2V, VI=5V, IO1=IO2=1A

INH

10/18 Doc ID 13866 Rev 5

ST2S06A33, ST2S06B Typical application

6 Typical application

Figure 21. Application circuit for the ST2S06A33

V

IN

VIN_A

VIN_SW

ST2S06A33

NC

Reset_Out

GND2

C1

GND1

4.7 µF

Figure 22. Application circuit for ST2S06B

V

V

IN

C1

C1

4.7µF

4.7µF

IN

VIN_A

VIN_A

VIN_SW

VIN_SW

ST2S06B

ST2S06B

INH

INH

NC

NC

GND1

GND1

GND2

GND2

HV

HV

HV

GND_A

GND_A

SW2

VFB2

SW1

VFB1

GND_A

SW2

SW2

VFB2

VFB2

SW1

SW1

VFB1

VFB1

R2

R2

R2

L1

3.3 µ H

R1

L1

L1

3.3µH

3.3µH

R1

R1

3.3 µ HL2

R3

V

O2

V

O1

C2

22µF

3.3µHL2

3.3µHL2

V

V

O1

O1

C2

C2

22µF

22µF

R4

R4

R4

R3

R3

C3

22µF

V

V

O2

O2

C3

C3

22µF

22µF

Doc ID 13866 Rev 5 11/18

Application information ST2S06A33, ST2S06B

7 Application information

The ST2S06A33 and ST2S06B represent a series of dual adjustable current mode PWM
step-down DC-DC converters with an internal 0.5 A power switch, packaged in a QFN12L
(4x4 mm).

It is a complete 0.5 A switching regulator with internal compensation that eliminates the
need for additional components.

The constant frequency, current mode, PWM architecture and stable operation with ceramic
capacitors results in low, predictable output ripple.

To clamp the error amplifier reference voltage a soft start control block generating a voltage
ramp has been implemented. Other circuits fitted to the device protection are the thermal
shut-down block, which turns off the regulator when the junction temperature exceeds 150
°C (typ.), and the cycle-by-cycle current limiting that provides protection against shorted
outputs.

The output voltage is determined by an external resistor divider, as the ST2S06A33 and
ST2S06B are adjustable regulators. The desired value is given by the following equation:

V

= V

O

Operation of the device requires few components: 2 inductors, 3 capacitors and a resistor
divider. The chosen inductor must be capable of not saturating at the peak current level. Its
value should be selected keeping in mind that a large inductor value increases the efficiency
at low output current and reduces output voltage ripple, while a smaller inductor can be
chosen when it is important to reduce package size and total application cost. Finally, the
ST2S06A33 and ST2S06B have been designed to work properly with X5R or X7R SMD
ceramic capacitors both at the input and at the output. These types of capacitors, due to
their very low series resistance (ESR), minimize the output voltage ripple. Other low ESR
capacitors can be used according to the need of the application without compromising the
correct functionality of the device. Due to the high switching frequency and peak current, it is
important to optimize the application environment by reducing the length of the PCB traces
and placing all the external components near the device.

[1+R1/R2]

FB

Figure 23. Reset function

V

V

TH

V

V

IN

IN

Reset

Reset

12/18 Doc ID 13866 Rev 5

TH

t

t

DEL

DEL

V

V

TL

TL

ST2S06A33, ST2S06B Package mechanical data

8 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at:
ECOPACK

®

packages, depending on their level of environmental compliance. ECOPACK®

®

is an ST trademark.

www.st.com

.

Doc ID 13866 Rev 5 13/18

Package mechanical data ST2S06A33, ST2S06B

QFN12L (4x4) mechanical data

mm. inch.

Dim.

Min. Typ. Max. Min. Typ. Max.

A0.800.90 1.00 0.031 0.035 0.039

A1 0.02 0.05 0.001 0.002

A3 0.20 0.008

b 0.25 0.300.35 0.010 0.012 0.014

D 3.9 0 4.00 4.10 0.154 0.157 0.161

D2 2.00 2.15 2.25 0.079 0.085 0.089

E 3.90 4.00 4.10 0.154 0.157 0.161

E2 2.00 2.15 2.25 0.079 0.085 0.089

e0.800.031

L 0.45 0.55 0.65 0.018 0.022 0.026

14/18 Doc ID 13866 Rev 5

7936361B

ST2S06A33, ST2S06B Package mechanical data

Tape & reel QFNxx/DFNxx (4x4) mechanical data

mm. inch.

Dim.

Min. Typ. Max. Min. Typ. Max.

A 330 12.992

C 12.8 13.2 0.504 0.519

D 20.2 0.795

N 99 101 3.898 3.976

T 14.4 0.567

Ao 4.35 0.171

Bo 4.35 0.171

Ko 1.1 0.043

Po 4 0.157

P 8 0.315

Doc ID 13866 Rev 5 15/18

Package mechanical data ST2S06A33, ST2S06B

Figure 24. QFN12L (4x4 mm) footprint recommended data

16/18 Doc ID 13866 Rev 5

ST2S06A33, ST2S06B Revision history

9 Revision history

Table 8. Document revision history

Date Revision Changes

3-Sep-2007 1 Initial release.

21-Jan-2008 2 Added root part number ST2S06D33.

18-Mar-2008 3 Modified:

28-Jul-2009 4 Modified:

– Changed max value for Non-switching quiescent current to 1.2 mA in

24-May-2012 5

Features on page 1.
– Updated part number in
– Minor text changes throughout the document

Table 2 on page 4

Table 1 on page 1

.

.

Figure 21 on page 11

Doc ID 13866 Rev 5 17/18

ST2S06A33, ST2S06B

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