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