STODD01 STMicroelectronics, STODD01 Datasheet - Page 15

• Manufacturer Part Number: STODD01
• Description: Monolithic power management for high definition ODD with true shut-down, reset, and programmable step-up voltage
• Manufacturer: STMicroelectronics

Specifications of STODD01

• Typical Efficiency: > 90 %
• Low Switching Quiescent Current: max 2.2 mA overtemperature range

STODD01
7.3
Figure 11. S-Wire connection
7.4
Figure 32
completely discharged and the current limitation is due only to the equivalent series resistor
of the inductor, the power MOSFET parasitic diode, and the cut-off MOSFETs’ R
soon as the output voltage reaches the input voltage level, the device begins to switch and
the current is limited cycle by cycle.
The EN pin does not have an internal pull-up, which means that the enable pin cannot be
left floating.
If the enable function is not used, the EN pin must be connected to V
TX pin
The device implements an S-wire bus communication, which uses one control signal coming
from the microprocessor to program the step-up STODD01 output voltage (see
S-wire protocol allows the feedback voltage of the step-up section to be changed from 0.8 to
1.25 V, with steps of 15 mV (see
This feature allows complete and easy control of the laser diode power during read and
write operation.
If this function is not used, the TX pin must be connected to GND.
Reset function
This flag shows that input voltage is in the correct range.
A comparator senses the input voltage. When it is higher than V
high impedance, with a delay of 100 ms (typ.). If it is below V
impedance (see
shows the in-rush current at enable transient. Initially, the C
Figure
µP
GND
GND
12).
Doc ID 17789 Rev 2
Table
9).
Reset
EN
TX
Reset
EN
TX
GND
STODD01
GND
R_TL
R_TH
, the reset pin goes to low
, the reset pin goes to
IN .
4
Detailed description
capacitor is
Figure
DSon
. As
11).
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