RT3612EB datasheet(5/47 Pages) RICHTEK

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RT3612EB

DS3612EB-02 December 2019

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Operation

G-NAVPTM Control Mode

The RT3612EB adopts G-NAVPTM (Green Native AVP)

which is Richtek's proprietary topology. It is derived from

current mode constant on-time control with finite DC gain

of error amplifier and DC offset cancellation. The topology

can achieve easy loadline design and provide high DC

accuracy and fast transient response. When sensed

current signal reaches sensed voltage signal, the

RT3612EB generates a PWM pulse to achieve loop

modulation. Figure 1 shows the basic G-NAVPTM behavior

waveforms. The COMP signal is the sensed voltage, that

is inverted and amplified signal of output voltage. While

current loading is increasing, referring to Figure 1, COMP

rises due to output voltage droop. Then rising COMP

forces PWM turn on earlier and closely. While inductor

current reaches loading current, COMP enters another

steady state of higher voltage and corresponding output

voltage is in the steady state of lower voltage. The loadline,

output voltage drooping by an amount proportional to

loading current, is achieved.

SVID Interface/Control Logic/Configuration

Registers

SVID Interface receives or transmits SVID signal with CPU.

Control Logic executes command (Read/Write registers,

setVID, setPS) and sends related signals to control VR.

Configuration Registers include function setting registers

and CPU required registers.

IMON Filter

IMON Filter is used to average current signal by analog

low-pass filter. It outputs IMONAVG to the MUX of ADC for

current reporting.

MUX and ADC

The MUX supports the inputs of SET1, SET2, SET3,

TSEN, PSYS and IMONAVG. The ADC converts these

analog signals to digital codes for reporting or function

settings.

Figure 1. G-NAVPTM Behavior Waveform

Sensed Current Signal

COMP

VID

cc x RLL

Steady State

PWM

Load Transient

Loading Current ΔIcc

VOUT

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