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
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