RT7207 datasheet(4/25 Pages) RICHTEK

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RT7207

DS7207-00 January 2017

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Functional Block Diagram

Operation

The RT7207 is a highly integrated secondary-side USB

PD Type-C controller with various functions and protections

for off-line AC-DC converters.

Power Structure

Biased by the VDD pin, the RT7207 has two regulated DC

output voltages, V5 and V2, to supply the internal circuit

and the internal microprocessor (MCU). The bypass

capacitors at the V2 and V5 pins are required to improve

stability of the internal LDO and to minimize regulated

ripple voltages. The RT7207 also integrates a charge

pump to generate a boost voltage V9 from V5 with VCP

pin for capacitor connection so that the V9 voltage can be

nearly 2 times of the V5 voltage and the VG pin can directly

drive the SR MOSFET. Besides, the charge pump allows

the controller to operate under low supply voltage condition

as long as the output voltage is not below the programmed

UVP level.

Constant-Voltage and Constant-Current (CV/CC)

Regulators

Two regulators are paralleled and connected to an open-

drain output, OPTO pin. The operation of each feedback

loop is similar to that of the traditional TL431 shunt regulator

except that VOPTO operating range is wider, from 0.3V to

25V, which enables easy design of converters with a wider

output range. The OPTO pin will be in high-impedance

state, if the VDD voltage is still below a UVLO threshold

VVDD_ON, which ensures a smooth power-on sequence.

The reference voltages, VREF_CV and VREF_CC, for the

voltage and current feedback loops, respectively, are analog

output voltages from the embedded DAC, and their digital

counterparts are from the MCU. The analog output range

of the 9-bit DAC is from 0 to VDAC_MAX (typical 2.7V), which

makes output voltage resolution as small as 42mV and

26mV for the RT7207 and RT7207L, respectively, to achieve

high-precision CV regulation.

CC_CV

Shunt Regulator

Synchronous

Rectifier

Controller

MCU

ADC

Amp

DAC

Power

OSC

CS-

CS+

D-

D+

V_TR

VDD

VREF_CV

VREF_CC

BLD

VFB

IFB

OPTO

Charge Pump

VDD

V_TR

VCP

WDT

OTP-ROM

SRAM

TMR

PROG/TST

Green

Alarm

AGND

Protection

USBP

BLD

USBP

OVP

PHY

CC1

CC2

CC1

CC2

PGND

RT7207 Datasheet(PDF) 4 Page - Richtek Technology Corporation

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