RT8092BCGWSC datasheet(6/27 Pages) RICHTEK

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RT8092

DS8092-03

January 2017

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

the extra power consumption by body diode or negative

inductor current. Regard with this defect, AZC adjusts

current threshold continuously when the RT8092 is

operating. With AZC circuit, the RT8092 could avoid

negative current in PSM mode and could achieve higher

efficiency performance.

Minimum Peak Current

Minimum peak current is an evolution version from

minimum on time. Rather than fixed minimum on time,

Minimum peak current produce the

“effective minimum

on time

” which could be adjusted according to V

IN/VOUT

condition.





MIN_Peak

OUT

It's an advantage to not provide too much energy at low

duty; also, to not provide too less energy at high duty.

When the converter is in PSM operation, every time pulse

skip duration finishes, the converter will provide current

energy for output loading by turning on P-MOSFET until

inductor current achieve minimum peak current.

Low Power Mode (LPM)

The RT8092 provides Low Power Mode (LPM) to save

more quiescent consumption. With maximum output

current ability, 1mA, LPM enhances the efficiency at load

below 100

μA, more than the Pulse Skipping Mode (PSM)

does. This extremely efficiency improvement may extend

battery life, especially in stand-by mode of hand held

products.

Enabling

The converter can be enabled or disabled by IC pin, EN.

For more flexibility, users can turn on/off the converter by

I2C programming. There are ENSEL register bit located in

internal enable signal for both VSEL selection high/low.

Dynamic Voltage Scaling (DVS)

Users can select required output voltage bank and preferred

output voltage by I

2C programming. When output voltage

is changed, the RT8092 provides Dynamic Voltage Scaling

(DVS) skill to prevent any undershoot or overshoot when

output voltage transition. The DVS means to adjust one

reference voltage into another reference voltage in steps

smoothly. The slew rate of the internal reference voltage

is around 3mV / 10

μs. Please note DVS function could

only be available in the same output voltage bank.

Remote Ground Sensing

The RT8092 can deliver output current up to 4A. Inevitably,

there is voltage drops due to the routing trace resistance

between output node and chip location, especially when

heavy loading. Also, voltage drops exist in ground trace.

Remote ground sensing pin, GNDR, can tell the converter

the lost drops to compensate to the correct and accuracy

voltage level.

Active Output Discharge

To make sure that no residual voltage remains in the power

supply rail, an active discharge path can ground the output

voltage. The output gets discharged by the LX pin with a

typical discharge resistor when the device shuts down.

This feature can be easily disabled or enabled with register

0x12.Discharge. By default the discharge path is active.

The default value of the feature is factory programmable.

Power Good

When the output voltage is higher than Power Good rising

threshold, the Power Good flag, register 0x01.SEN_PG

is high.

Under-Voltage Lockout (UVLO)

The UVLO continuously monitors the PVIN voltage to make

sure the device works properly. When the PVIN is high

enough to reach the UVLO high raising threshold voltage,

2.4V, the converter softly starts. When the PVIN decreases

to its UVLO low threshold voltage, 2.3V, the device will

shut down. The event is recorded in register

0x18.PVIN_UVLO. The record can be reset with I2C

interface or automatically reset by re-power-on AVDD.

Output Under-Voltage Protection (UVP)

When the output voltage is lower than UVP threshold

(~50% of nominal target) after soft-start, the UVP is

triggered. The converter will be latched and the output

voltage will no longer be regulated during UVP latched

state. Re-power-on input voltage or EN pin can unlatch

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