ST STODD03 User Manual

Monolithic 2-channel power management

for high-definition ODD with integrated power switch

Features

■ 1.2 MHz DC-DC current mode PWM converter

■ Input voltage from 4 V up to 6 V

■ Step-down 3.3 V fixed output voltage, up to 700

mA load

■ Step-up output current up to 500 mA

■ 2% step-down output voltage tolerance

■ 3% step-up output voltage tolerance

■ Synchronous rectification

■ Step-down power-save mode at light load

■ Typical efficiency: 90%

■ Internal soft-start

■ Enable functions

■ True cutoff function for step-up converter

■ Integrated motor control power switch

■ Uses tiny capacitors and inductors

■ Available in QFN16 (4 x 4 mm)

Description

The STODD03 is a 2-channel power
management device intended for Blu-Ray
applications based on high density optical storage
devices. It integrates one step-down converter
able to provide 3.3 V fixed output voltage up to
700 mA load, and one step-up converter to
provide the power supply needed for the blue
laser in applications where only 5 V input voltage
is available. The step-up output voltage is
adjustable in the range from 6.5 V to 14 V, with
current capability up to 500 mA. Both step-down
and step-up channels integrate low R
channel and P-channel MOSFETs, allowing high
DC-DC efficiencies. The enable function with true

DS_ON

N-

STODD03

QFN16L (4 x 4 mm)

shutdown makes the step-up section particularly
suitable for optical storage power management
applications. Moreover, the STODD03 has a 1 A
integrated power switch for motor control power
supply. The high switching frequency allows the
use of tiny SMD components. Low output ripple
voltage is achieved thanks to the current mode
PWM topology. The device includes soft-start
control, thermal shutdown, and peak current limit
to prevent damage due to accidental overload.
The STODD03 is packaged in a QFN16 (4 x 4
mm).

Table 1. Device summary

Part number Order code Marking Package

STODD03 STODD03PQR ODD03 QFN16 (4 x 4 mm)

August 2011 Doc ID 018980 Rev 1 1/16

www.st.com

16

Contents STODD03

Contents

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

2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2/16 Doc ID 018980 Rev 1

STODD03 Block diagram

1 Block diagram

Figure 1. Block diagram

SW1

14

EN1

V

IN _A

V

IN _P

EN2

VIN_PSW

EN

EN

15

Step-up

contr ol block

Step Up

3

7

Step Down

4

6

13

SW

SW

16

Power S witch

Control block

Power Switc h

12

Out1

2

FB1

8

SW2

10

FB2

PSW

5

OUT

1,9,11

GND

AM09305v1

Doc ID 018980 Rev 1 3/16

Absolute maximum ratings STODD03

2 Absolute maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

IN_P

Power supply input voltage -0.3 to 7 V

VIN_PSW Power switch input voltage -0.3 to 7 V

V

EN

IN_A

Analog supply input voltage -0.3 to 7 V

All enable pins voltage -0.3 to V

XX

IN_A

V

SW1 Ch1 input switching pin -0.3 to 16 V

SW2 Ch2 output switching pin -0.3 to 7 V

PSW

I

OUT

FB

FB

T

T

SW

STG

OP

Power switch output pin -0.3 to 7 V

OUT

Power switch max output current 1.2 A

Ch1 output voltage pin -0.3 to 16 V

1

Ch1 feedback voltage pin -0.3 to 2.5 V

1

Ch2 feedback voltage pin -0.3 to 5 V

2

Storage temperature range -50 to 150 °C

Operating junction temperature range -25 to 125 °C

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

Functional operation under these conditions is not implied. All values are referred to gnd.

Table 3. Thermal data

Symbol Parameter Value Unit

R

R

thJC

thJA

Thermal resistance junction-case 2.5 °C/W

Thermal resistance junction-ambient 46 °C/W

4/16 Doc ID 018980 Rev 1

STODD03 Pin configuration

3 Pin configuration

Figure 2. Pin connections (top view)

Table 4. Pin description

Pin number Symbol Function

1 GND_P1 Power ground pin (ch1)

2 FB1 Step-up feedback pin (ch1)

3V

4 EN2 Step-down enable pin. Connect to V

5 PSW

6 VIN_PSW Power switch input

7V

8 SW2 Step-down switching pin (ch2)

9 GND_P2 Power ground (ch2)

10 FB2 Step-down feedback (ch2)

11 GND_A Analog ground pin

12 OUT1 Step-up output voltage

13 EN-SW Power switch enable pin active high (see Ta bl e 5 )

14 SW1 Step-up switching pin (ch1)

15 EN1

IN_A

OUT

IN_P

Power supply for internal analog circuits

if not used.

IN_A

Power switch output pin. PSW
exceed 1 A max.

Power input voltage

Step-up enable pin. Step-up is enabled if EN1 > 1.2 V and EN-SW
also Table 6: Step-up EN1 and EN-SW truth table). When the step-up is disabled, no
current will flow to the load thanks to the true-shutdown function.

output current is not internally limited. Do not

OUT

is set low (see

16 EN-SW

epad Epad

Power switch Enable pin active low (see Tab l e 5 )

Exposed pad to be connected to a suitable gnd layer area, through vias, for thermal
heat dissipation.

Doc ID 018980 Rev 1 5/16

Pin configuration STODD03

Table 5. Power switch truth table

EN-SW EN-SW Power switch status

HH Open

LL Open

LH Open

HL Close

Table 6. Step-up EN1 and EN-SW truth table

EN-SW EN1 EN-SW Step-up output status

xH H OFF

xL H OFF

xL L OFF

xH L ON

6/16 Doc ID 018980 Rev 1

STODD03 Typical application

4 Typical application

Figure 3. Application circuit

V

IN

C1

5 V

15

EN1

V

IN_ A

C3

C2

V

EN

V

IN_ P

EN2

IN_PSW

EN

SW

SW

control block

3

7

4

6

13

Power Switch
Contr ol block

16

Table 7. List of external components

Step-up

(1)

GND

L1

SW1

14

Step Up

Step Down

Power Switch

1,9,11

12

2

8

10

5

Component Value Recommended part number

Out1

FB1

SW2

FB2

PSW

V

OUT1

R1

R2

L2

6.5 V – 14 V

C4

V

OUT2

3.3 V

C5

OUT

AM09306v1

C1, C2, C3 10 µF Murata, GRM21BR61A106KE19L

C4, C5 22 µF Murata, GRM32ER61C226KE20L

L1 4.7 µH Coilcraft, LPS6225-472MLB

L2 3.3 µH Coilcraft, LPS4018-332MLB

R1, R2 33 kΩ

1. The components listed above refer to a typical applications circuit. Operation of the STODD03 is not limited to the choice of
these external components. If a different solution is used, it is recommended to validate the suitability of the external

, 3.3 kΩ V

OUT1

= 8.8 V

components by thoroughly testing the application on a PCB evaluation board.

2. R1 and R2 are calculated according to the following formula:
R1 = R2 x [(V

OUT1

/ V

)- 1]. Resistors in the range of 1 k to 50 k are recommended.

FB1

(2)

Doc ID 018980 Rev 1 7/16

Electrical characteristics STODD03

5 Electrical characteristics

Refer to the typical application circuit, V
V

OUT2

= 3.3 V, C

= 10 µF, C

1,2,3

(unless otherwise specified, typical values are given at T

Table 8. Electrical characteristics

= 22 µF, L1 = 4.7 µH, L2 = 3.3 µH, TJ = - 25 to 125 °C

4,5

IN_P

= V

IN_A

= V

IN_PSW

= 25 °C).

J

= V

EN1,2

= 5 V, V

OUT1

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

IN

I

SUPPLY

Input voltage range 4 6 V

V

> 1.2 V, no switching 1.6 2 mA

Supply current

EN1,2

V

< 0.4 V, no switching 1.2 2 mA

EN1,2

Step-up section

V

OUT

Output voltage range 6.5 14 V

Feedback voltage TJ = 0 to 85 °C 0.776 0.8 0.824 V

V

FB1

I

FB1

I

OUT1_OFF

(leak)

V

OVP Overvoltage protection

OUT1

R

DSon_N

R

DSon_P

I

SW1 (leak)

I

SW1 (LIM)

PWM f

s

D

MAX

ν Efficiency

V

EN1_H

V

EN1_L

I

EN1

ΔV

/ΔVINLine transient response

OUT1

ΔV

/ΔI

OUT1

OUT

ΔV

/ΔVINStartup transient

OUT1

t

START

Feedback voltage accuracy T

Feedback current V

Output leakage current VEN= 0 V, TJ = 0 to 80 °C 20 µA

(1)

Internal N-channel R

Internal P-channel R

DSon

DSon

Internal leakage current V

SW current limitation V

Oscillator frequency to be measured on SW1 pin 0.75 1.2 1.5 MHz

Max oscillator duty cycle on SW1 pin, V

Enable threshold high V

Enable threshold low V

Enable pin current V

(2)

Load transient response

(2)

(2)

Startup time V

Inrush current V

= 0 to 85 °C -3 3 %

J

= 0 V, V

FB1

V

= 0 V 14.8 15.3 15.8 V

FB1

I

=400 mA 300

SW1

I

=400 mA 300

SW1

= 4 V, V

SW1

= 9.2 V 2.6 A

OUT1

= 50 mA, V

I

OUT1

I

= 500 mA, V

OUT1

= 100 mA, V

I

OUT1

I

= 500 mA, V

OUT1

= 4 to 6 V 1.2

IN

= 4 to 6 V 0.4

IN

= VIN = 5 V 2 µA

EN1

VIN from 4 to 6 V, I
mA, tR = tF => 30 µs, TJ = 25 °C

V

= 5 V, I

IN

500 mA, tR = tF => 5µs, TJ= 25 °C

V

from 0 to 5 V, I

IN

from 0 to 5 V, I

EN1

=9.25 V, I

OUT

= 2 V 600 nA

EN1

= 2 V, V

FB1

= 0.7 V 70 90 %

FB1

OUT1

OUT1

OUT1

OUT1

OUT1

from 100 mA to

OUT1

OUT1

OUT1

=100 mA 1.3 A

OUT

= 0 V 2 µA

EN1

= 7 V 80

= 7 V 85

= 9 V 75

= 9 V 85

= 500

-5 5

-5 5

= 500 mA -10 10

=100mA 500 µs

= 9 V,

mΩ

%

V

%

V

OUT

%

V

OUT

%

V

OUT

8/16 Doc ID 018980 Rev 1

STODD03 Electrical characteristics

Table 8. Electrical characteristics (continued)

Symbol Parameter Test conditions Min. Typ. Max. Unit

Step-down section

Feedback voltage TJ = 0 to 85 °C 3.23 3.3 3.37 V

FB2 pin bias current V

Output current

Minimum output current 0 mA

Reference load regulation

PWM switching frequency 1.2 MHz

S

/ΔVINReference line regulation 4 V < V

Maximum duty cycle V

Switching current limitation 1.5 A

PMOS leakage current

NMOS leakage current

NMOS switch-on resistance ISW = 250 mA 0.2 Ω

PMOS switch-on resistance ISW = 250 mA 0.3 Ω

/

Load transient response

I

OUT_MIN

ΔV

PWM f

%V

R

R

ΔV

FB

I

FB2

I

OUT2

OUT2

OUT2

D

MAX

I

SWL

I

LKP2

I

LKN2

DSon-N

DSon-P

OUT2

ΔI

OUT2

2

ν Efficiency

V

EN2_H

V

EN2_L

I

EN2

Enable threshold high V

Enable threshold low V

Enable pin current V

Power switch section

(2) (3)

= 3.5 V 15 20 µA

FB2

VIN = 4 to 6 V 700 mA

(2)

10 mA < I

IN

= 3.0 V 85 94 %

FB2

= 3.5 V, V

V

FB2

TJ = 0 to 80 °C

V

= 3.5 V, V

FB2

TJ = 0 to 80 °C

100 mA < I

(2)

tR = tF => 100 ns, TJ = 25 °C

V

= 3.3 V, I

OUT

= 3.3 V, I

V

OUT

= 4 to 6 V 1.2

IN

= 4 to 6 V 0.4

IN

= VIN = 5 V 2 µA

EN2

< 0.5 A 5.5 15 mV

OUT2

< 6 V 0.032

= GND,

SW2

= 5 V,

SW2

< 500 mA,

OUT2

= 100 mA 75

OUT

= 500 mA 85

OUT

-5 +5 %V

0.1 µA

0.1 µA

%V

/V

OUT

IN

OUT

%

V

R

DSon-P

I

SW

I

LKSW

V

IN_PSW

V

EN_SW_H

V

EN_SW_L

I

EN_SW

PMOS switch-on resistance ISW = 250 mA 0.3 Ω

Switching operating current 1 A

Switching leakage current

EN_SW = EN_SW

= 0 to 80 °C

T

J

= H,

1µA

Input voltage range 4 6 V

Enable pins threshold high V

Enable pins threshold low V

Enable pins current V

= 4 to 6 V 1.2

IN

= 4 to 6 V 0.4

IN

= VIN = 5 V 2 µA

EN_SW

Doc ID 018980 Rev 1 9/16

V

Electrical characteristics STODD03

Table 8. Electrical characteristics (continued)

Symbol Parameter Test conditions Min. Typ. Max. Unit

Thermal section

T

SHDN

T

HYS

1. If V

OUT1

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

3. V

= 90% of nominal value

OUT

Thermal shutdown

Thermal shutdown hyst.

> OVP, the device stops switching.

(2)

(2)

130 150 °C

15 °C

10/16 Doc ID 018980 Rev 1

STODD03 Package mechanical data

6 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK

®

packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions, and product status, are available at www.st.com.
ECOPACK is an ST trademark.

Table 9. QFN16 (4 x 4 mm) mechanical data

Dim.

Min. Typ. Max.

A 0.80 0.90 1.00

A1 0.00 0.02 0.05

A3 0.20

b 0.25 0.30 0.35

D 3.90 4.00 4.10

D2 2.50 2.80

E 3.90 4.00 4.10

E2 2.50 2.80

e0.65

mm.

L 0.30 0.40 0.50

Doc ID 018980 Rev 1 11/16

Package mechanical data STODD03

Figure 4. QFN16 (4 x 4 mm) drawing

12/16 Doc ID 018980 Rev 1

7571203_A

STODD03 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 018980 Rev 1 13/16

Package mechanical data STODD03

Figure 5. QFN16 (4 x 4 mm) recommended footprint

14/16 Doc ID 018980 Rev 1

STODD03 Revision history

7 Revision history

Table 10. Document revision history

Date Revision Changes

30-Aug-2011 1 First release.

Doc ID 018980 Rev 1 15/16

STODD03

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16/16 Doc ID 018980 Rev 1