VCTA25201B-R33MS6 datasheet(6/50 Pages) RICHTEK

6 / 50 page

RTQ2134-QA

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DSQ2134-QA-02

May

2022

Operation

The RTQ2134 is a power management IC that

integrates four high efficiency Buck converters, and is

capable of providing multiphase or single phase

operation. Each of the four converters provides up to

5.5A of maximum output current over an input supply

voltage range of 3.3V to 6V.

The

RTQ2134

utilizes

the

proprietary

Advanced

Constant On-Time (ACOT® ) control architecture. The

ultrafast ACOT® control enables the use of small

ceramic capacitors (MLCC) to save the PCB size.

During normal operation, the internal high-side power

switch (HSFET) is turned on for a fixed interval

determined by a one-shot timer at the beginning of each

clock cycle. When the HSFET is turned off, the internal

low-side power switch (LSFET) is turned on. The output

voltage is sensed remotely at VOUTx and RTNx for high

accuracy and is compared to an internal reference

voltage. Hence, the error signal is obtained and

internally compensated. The compensated error signal

is then compared to an internal ramp signal. When the

minimum off-time one-shot (100ns, max.) has timed out

and the inductor current is below the current-limit

threshold, the one-shot is triggered again if the internal

ramp signal falls below the compensated error signal.

The ACOT®

control architecture features ultrafast

transient response. When a load is suddenly increased,

the output voltage drops quickly, and triggers a new

on-time to rise inductor current again.

Dynamic Voltage Scaling (DVS)

The RTQ2134 provides wide output voltage range with

8-bit resolution and each Buck converter has two

independently programmable voltage setting. They are

called DVS0 and DVS1. Take Buck1 as two-phase

configuration for example, register 0x48[8:0] can set

voltage of DVS0 while 0x4A[8:0] is used to set voltage

of DVS1. There are two methods to select the DVS. For

the first method, it can be changed by software from

0x52[1:0].

Control

DVS0

setting

0x52[1:0]=00 and DVS1 by setting 0x52[1:0]=01. For

the second method, selecting the DVS can be from

external hardware pin when setting 0x52[1:0]=10.

VSELA pin can be this role and its polarity is defined by

0x52[2]. When setting 0x52[2]=0, pull VSELA high to

put DVS0 in use and pull VSELA low to put DVS1 in

use. Conversely, when setting 0x52[2]=1, pull VSELA

high to put DVS1 in use and pull VSELA low to put

DVS0 in use.

The RTQ2134 also supports DVS speed configuration,

whether the slew rate of voltage changes in the same

DVSx or between DVS0 and DVS1. Take Buck1 as

two-phase configuration for example, when output

voltage is set from low to high or high to low, register

0x54[6:4] defines slew rate of DVS up while 0x54[2:0]

is used to define slew rate of DVS down. In order to

have better performance during voltage changing

operation, the master/slave enters PWM operation and

keeps 200

s after the voltage achieves target even

when IC is set to Auto mode. Figure 1 and Figure 2

show the DVS up and down operation.

Command

Master

Switch

VOUT

Target Voltage

Intial Voltage

95%

Slave

Switch

200

μs

DVS Up Slew Rate

Figure 1. DVS Up Operation

Command

Master

Switch

VOUT

Target Voltage

Intial Voltage

95%

Slave

Switch

200

μs

DVS Down Slew Rate

Figure 2. DVS Down Operatio

VCTA25201B-R33MS6 数据表(PDF) 6 Page - Richtek Technology Corporation

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