RT6191A
thermistor from TSEN pin to AGND and a resistor from
VDD to TSEN pin. Register 0x1A/0x1B can report the
TSEN pin voltage from 0V to 2V with 1mV resolution
while ADC function is enabled (0x10[1] = 1).
Power Path Control
The RT6191A integrates an internal gate driver to
control external power path MOSFETs for USB-C and
USB-A (1C1A) VBUS terminals when V
= 5V. The
BUS
GPC/VBUSC pins are used for USB-C terminal, and
GPA/VBUSA pins are used for USB-A terminal.
Register 0x29[3:2] selects the external MOSFETs type
of N-MOSFETs and P-MOSFETs for USB-C and USB-
A terminals, and register 0x29[1:0] are the enable
control bit for each power path MOSFETs. All power
path MOSFETs will be turned off when protection
happens with the default factory setting of register
0x29[7:4], and it can be set after internal digital circuit
enabled for different applications. In addition, the default
factory setting of register 0x29[1:0] is 00 for power path
function not used.
Spread-Spectrum Operation
Due to periodicity of the switching signals, the energy
concentrates in one particular frequency and in its
harmonics. These levels of energy will be radiated to
induce potential EMI issues. The RT6191A provides
spread-spectrum function by register 0x11[7] for
simplifying in compliance with the CISPR and EMI
requirements.
After the soft-start ends, the spread-spectrum can be
enabled with a pseudo random sequence and used
+8% spread of the switching frequency. This function is
default disabled.
Cable Voltage Drop Compensation
Timer1 and Watchdog Function
The RT6191A implements cable voltage drop
compensation to adjust the output voltage in heavy load
condition for different equivalent series resistance (ESR)
of USB cables. Register 0x0E[2:0] can set different
compensation, and the default factory setting of
0x0E[2:0] is 000 for cable voltage drop compensation
function default disabled. Besides, this function is
inactive when RT6191A operates in Bypass mode.
The RT6191A implements a Timer1 function to detect
Host status if system hang occurs without any
protection detected. Register 0x30[6:4] selects different
Timer1 timeout, and the default factory setting value of
0x30[6:4] is 000 for Timer1 disabled. Timer1 will begin
to count if 0x30[6:4] ≠ 000, and ALERT pin keeps high
level if Timer1 is still counting. After Timer1 timeout
completes, external ALERT pin will go to low level.
Power Good Indication
The RT6191A also implements a watchdog function to
reset IC to factory default setting after watchdog timeout
completes if ALERT pin keeps at low level. Register
0x30[2:0] selects different watchdog timeout, and the
default factory setting value of 0x30[2:0] is 000 for
watchdog disabled.
The RT6191A provides a power good indication with
open-drain output capability to show the output voltage
status. When output voltage is between 90% and 120%
(typically OVP trip threshold of default factory setting) of
reference voltage, the external PGOOD pin keeps as
high level and internal PGOOD bit changes to “1” in
register 0x1D[6] and 0x1F[6]. Register 0x1F[6] also
shows the output voltage status for DVS operation,
0x1F[6] will change to “1” if the output voltage reaches
to the target voltage whether in DVS up or down
operation.
Status Change Detection and ALERT Pin
The RT6191A implements a status change detection to
alert the host when a warning or fault event occurs by
using the external ALERT pin with push-pull output
capability for active low behavior. The warning events
are input UVLO, Timer1 and PGOOD, and the fault
events are the conditions of over-voltage, under-voltage,
over-current and over-temperature. In addition,
PGOOD event indicates output voltage status for
normal and DVS operation.
External Thermal Sense
The RT6191A provides an external thermal sense
function to sense the temperature of external
components such as inductor or MOSFETs by
connecting a negative temperature coefficient (NTC)
Register 0x1C, 0x1D, 0x1E and 0x1F can help the host
Copyright © 2022 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6191A-00
December 2022
www.richtek.com
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