STODD03
Monolithic 2-channel power management
for high-definition ODD with integrated power switch
Features
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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)
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).
QFN16L (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
DS_ON
N-
channel and P-channel MOSFETs, allowing high
DC-DC efficiencies. The enable function with true
Table 1.
Device summary
Order code
STODD03PQR
Part number
STODD03
Marking
ODD03
Package
QFN16 (4 x 4 mm)
August 2011
Doc ID 018980 Rev 1
1/16
www.st.com
16
Contents
STODD03
Contents
1
2
3
4
5
6
7
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16
Doc ID 018980 Rev 1
Absolute maximum ratings
STODD03
2
Table 2.
Symbol
V
IN_P
VIN_PSW
V
IN_A
EN
XX
SW1
SW2
PSW
OUT
I
SW
OUT
1
FB
1
FB
2
T
STG
T
OP
Absolute maximum ratings
Absolute maximum ratings
Parameter
Power supply input voltage
Power switch input voltage
Analog supply input voltage
All enable pins voltage
Ch1 input switching pin
Ch2 output switching pin
Power switch output pin
Power switch max output current
Ch1 output voltage pin
Ch1 feedback voltage pin
Ch2 feedback voltage pin
Storage temperature range
Operating junction temperature range
Value
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to V
IN_A
-0.3 to 16
-0.3 to 7
-0.3 to 7
1.2
-0.3 to 16
-0.3 to 2.5
-0.3 to 5
-50 to 150
-25 to 125
Unit
V
V
V
V
V
V
V
A
V
V
V
°C
°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.
Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
Value
2.5
46
Unit
°C/W
°C/W
Table 3.
Symbol
R
thJC
R
thJA
4/16
Doc ID 018980 Rev 1
STODD03
Pin configuration
3
Figure 2.
Pin configuration
Pin connections (top view)
Table 4.
Pin number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
epad
Pin description
Symbol
GND_P1
FB1
V
IN_A
EN2
PSW
OUT
VIN_PSW
V
IN_P
SW2
GND_P2
FB2
GND_A
OUT1
EN-SW
SW1
EN1
EN-SW
Epad
Power ground pin (ch1)
Step-up feedback pin (ch1)
Power supply for internal analog circuits
Step-down enable pin. Connect to V
IN_A
if not used.
Power switch output pin. PSW
OUT
output current is not internally limited. Do not
exceed 1 A max.
Power switch input
Power input voltage
Step-down switching pin (ch2)
Power ground (ch2)
Step-down feedback (ch2)
Analog ground pin
Step-up output voltage
Power switch enable pin active high (see
Table 5)
Step-up switching pin (ch1)
Step-up enable pin. Step-up is enabled if EN1 > 1.2 V and EN-SW is set low (see
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.
Power switch Enable pin active low (see
Table 5)
Exposed pad to be connected to a suitable gnd layer area, through vias, for thermal
heat dissipation.
Function
Doc ID 018980 Rev 1
5/16
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