RT3602AE datasheet(25/46 Pages) RICHTEK

25 / 46 page

RT3602AE

DS3602AE-00 August 2017

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Phase Interleaving Function

The RT3602AE is a multi-output controller, the AUXI rail

of the IC has a phase interleaving function, 180 degree

phase shift for 2-phase operation which can help reduce

output voltage ripple and EMI problem.

Multi-Function Pin Setting Mechanism

For reducing total pin number of package, SET [1:3],

TSEN_MAINand TSEN_AUXI pins adopt the multi-function

pin setting mechanism in the RT3602AE. Figure 4

illustrates this operating mechanism for SET [1:3]. The

voltage at VREF pin will be pulled up to 3.2V after power

ready (POR). First, external voltage divider is used to set

the Function1, and then internal current source 80

μA is

used to set the Function2. The setting voltage of Function1

and Function2 can be represented as

Function1

Function2

V3.2V

R1 R2

V80 Α

R1 R2













All function setting will be done within 500

μs after power

ready (POR), and the voltage at VREF pin will be fixed to

0.6V after all function setting over.

If VFunction1 and VFunction2 are determined, R1 and R2 can

be calculated as follows :

Function2

Function1

3.2V V

80 Α V

R1 V

3.2V V













Connecting a R3 resistor from SETx pin or SETAx pin to

the middle node of voltage divider can help to fine tune the

set voltage of Function 2, which does not affect the set

voltage of Function1. The Figure 5 shows the setting

method and the set voltage of Function 1 and Function2

can be represented as :

Function1

Function2

V3.2V

R1 R2

V80 Α

R1 R2





















Figure 4. Multi-Function Pin Setting Mechanism for SET

[1:3]

VREF

SETx

80µA

Function 1

Function 2

ADC

Function 1

<5:0>

Function 2

<5:0>

VREF

SETx

80µA

Function 1

Function 2

ADC

Function 1

<5:0>

Function 2

<5:0>

Figure 5. Multi-Function Pin Setting Mechanism with a

R3 Resistor to Fine Tune the Set Voltage of Function2

VREF

80µA

Function 1

Function 2

ADC

Function 1

<5:0>

Function 2

<5:0>

SETx

VREF

80µA

Function 1

Function 2

ADC

Function 1

<5:0>

Function 2

<5:0>

SETx

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