STODD01 STMicroelectronics, STODD01 Datasheet - Page 14

• 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

Detailed description
7
7.1
7.2
Figure 10. True cut-off block
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Detailed description
Brief overview
The STODD01 is a complete high efficiency switching power management. Inside it has a
step-up converter with a current capability up to 0.7 A and two step-down converters with a
current capability up to 0.8 A.
The controller uses an average current mode technique in order to obtain good stability in all
application conditions.
The step-up converter, in order to guarantee the lowest switching ripple, operates in PWM
(pulse width modulation) in all load conditions.
Both step-down converters, in order to maintain good efficiency, operate in power-save
mode at light load. When the load increases, they automatically switch to PWM (pulse width
modulation) mode and the output voltage ripple is minimized.
The STODD01 is self protected against overtemperature and accidental short circuit in the
step down channel.
The soft-start function guarantees proper operation during startup.
Enable pin
The step-up section operates when the EN pin is set high. If the EN pin is set low the step-
up turns OFF. In this condition the supply current is lower than 2 mA in the whole
temperature range, and it represents the consumption of the step-down section.
When the EN pin is low, thanks to at the true cut-off function, implemented using two P-
channel MOSFETs in a back-to-back configuration, as shown in
current is stopped. In order to control and reduce the in-rush current, the true cut-off P-
channel (P
O
) manages the current during startup.
Ns
Ns
SW1
SW1
PGND
PGND
Doc ID 17789 Rev 2
Ps
Ps
Po
Po
OUT1
OUT1
Figure
10, the output
STODD01