STODD01 Datasheet, PDF (1/31 Pages) STMicroelectronics – Synchronous rectification

STODD01
Monolithic power management for high definition ODD with true
shut-down, reset, and programmable step-up voltage
Features
■ 1.2 MHz DC-DC current mode PWM converter
■ Dual step-down of up to 800 mA
■ Single step-up of up to 700 mA
■ 2 % DC output voltage tolerance for step-down
■ 3 % DC output voltage tolerance for step-up
■ Programmable step-up output voltage by S-
WIRE
■ Synchronous rectification
■ Power save mode at light load for step-down
■ Typical efficiency: > 90 %
■ Internal soft start with controlled inrush current
■ Reset function
■ Enable function for step-up
■ True cut-off function for step-up
■ Low switching quiescent current: max 2.2 mA
overtemperature range
■ Uses tiny capacitors and inductors
■ Available in QFN16 (4 x 4 mm.)
Description
The STODD01 is a complete power management
for Blu-Ray, based on high density optical storage
devices. It integrates two step-down converters
and one step-up. The step-down converters are
optimized for powering low-voltage digital core, up
to 0.8 A, in ODD applications and, generally, to
replace the high current linear solution when
power dissipation may cause a high heating of the
application environment. The step-up provides
the necessary voltage to supply the blue laser in
mobile applications where only 5 V is available.
The output voltage is programmable by using the
Table 1. Device summary
Part number
Order code
STODD01
STODD01PQR
QFN16L (4 x 4 mm.)
S-Wire protocol, in the range of 6.5 V to 14 V, with
a current capability of 0.7 A. The integrated low
R_DSon for N-channel and P-channel MOSFET
switches contribute to obtaining high efficiency.
The enable function for the step-up section, and
reset function for monitoring the input voltage,
make the device particularly suitable for optical
storage applications. The high switching
frequency (1.2 MHz typ.) allows the use of tiny
surface mounted components. Furthermore, a low
output ripple is achieved by the current mode
PWM topology and by the use of X7R or X5R low
ESR SMD ceramic capacitors. The device
includes soft-start control, thermal shutdown, and
peak current limit, to prevent damage due to
accidental overload. The STODD01 is packaged
in QFN16 (4 x 4 mm.).
Marking
ODD01
Package
QFN16 (4 x 4 mm.)
February 2011
Doc ID 17789 Rev 2
1/31
www.st.com
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