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RT7204E Datasheet(PDF) 36 Page - Richtek Technology Corporation

Part # RT7204E
Description  High-Integration USB Multi-Protocol Controller with Rectification Detection
PDF  45 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT7204E Datasheet(HTML) 36 Page - Richtek Technology Corporation

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RT7204E
F
Copyright © 2024 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
RT7204E_DS-00
May 2024
36
The RT7204E provides a control for the discharge current from the VDD pin. This function serves as a bleeder to
facilitate the discharge of the output capacitor to Vsafe5V upon the detachment of a connected device, or to a lower
desired output voltage level upon a UFP request, such as VOUT from 20V to 5V. During the falling interval, the
capability of IDIS_VDD must take the operating voltage and the output capacitors of the system into consideration.
The discharge current can be programmed by the internal register according to VDD voltage level, as shown in
Figure 10.
00: 60mA
01: 90mA
10: 120mA
11: 180mA
IDD_DIS
VDD
11-bit
ADC
MCU
Figure 10. Discharge Current Control from The VDD Pin
16.5
Output Overvoltage Protection
As shown in the Figure 11, the RT7204E provides a fast turn-off blocking N-MOSFET as a backup VOUT
overvoltage protection mechanism, in the event of malfunction due to aging of the optocoupler in the feedback
loop. If the internal voltage related to VDD exceeds the programmable threshold VVDD_OVP, the blocking N-
MOSFET will be turned off immediately. Meanwhile, a fault flag will be sent to the embedded MCU to enable
customized protection behavior.
VREF_CV
11-bit DAC
VDD
00: 110%
01: 115%
10: 120%
RFB1
RFB2
INT_VDDOV
11-bit
ADC
S
R
Q
Q
A
+
-
N-MOSFET
Driver
VBUS
VOUT
USBP
VDD
UVLO
RD
CP
OPTO
FAULT_EN
MCU
Figure 11. OVP Functional Diagram



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