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RT6310C/CH 数据表(PDF) 16 Page - Richtek Technology Corporation

部件名 RT6310C/CH
功能描述  10A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO
PDF  54 Pages
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制造商  RICHTEK [Richtek Technology Corporation]
网页  http://www.richtek.com
标志 RICHTEK - Richtek Technology Corporation

RT6310C/CH 数据表(HTML) 16 Page - Richtek Technology Corporation

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RT6310
Copyright © 2023 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
DS6310-04
August 2023
16
Internal Output Voltage Discharge
The RT6310 has an output voltage discharge function
by using an internal MOSFET 50
 (typical), which is
connected from the LX pin to PGND pin. The output
voltage discharge function is enabled if any of the
following events is triggered :
⚫
Input under-voltage-lockout (UVLO)
⚫
Output under/over-voltage protection (UVP/OVP)
⚫
Over-temperature protection (OTP)
⚫
EN/MODE pin is pulled low
Internal VCC Regulator (VCC)
The internal VCC regulator is a linear regulator. The VCC
regulator steps down input voltage to typical 5V in order
to supply both internal circuitry and gate drivers. DO
NOT connect to any external loads. Connect a capacitor
(C
= 1
F/0603) from VCC pin to AGND pin.
RT6310A/AH/D/DH enables VCC regulator after VIN
rises higher than UVLO rising threshold and EN/MODE
voltage is larger than EN/MODE input high voltage.
RT6310B/BH or RT6310C/CH enables VCC regulator
after VIN rises higher than UVLO rising threshold. The
power logic of VCC is shown in Table 2. For lower power
consumption, VCC switchovers to the following pins as
the specified condition (refer to Figure 4 and Figure 5)
is satisfied :
RT6310A/AH : VCC_EXT pin
RT6310D/DH : VCC_EXT pin
RT6310B/BH : VCC_EXT pin
RT6310C/CH : VOUT pin
Low Dropout Regulator (LDO)
Both RT6310B/BH and RT6310C/CH have 3.3V LDO
and 5V LDO, respectively. The output current capability
of these two LDOs are 100mA. The output current limit
of these two LDOs are 200mA. Once the input voltage
exceeds the UVLO rising threshold, the LDO is enabled.
In order to reduce the power consumption, LDO
switchovers to VOUT pin through the LDO bypass
switch when the following events are all satisfied :
⚫
Soft-start is completed
⚫
VOUT pin voltage is higher than LDO bypass switch
turn-on voltage
LDO bypass switch turn-on voltage of RT6310B/BH
is 3.1V
LDO bypass switch turn-on voltage of RT6310C/CH
is 4.7V
The LDO bypass switch is turned off when any of the
following specified events is triggered :
⚫
Input under-voltage-lockout (UVLO)
⚫
Output under/over-voltage protection (UVP/OVP)
⚫
Over-temperature protection (OTP)
⚫
EN/MODE pin is pulled low
⚫
Soft-start is not completed
⚫
The VOUT pin voltage is lower than LDO bypass
switch turn-off voltage (LDO bypass switch turn-on
voltage minus LDO bypass switch hysteresis voltage)
LDO bypass switch turn-off voltage of RT6310B/BH
is 2.9V
LDO bypass switch turn-off voltage of RT6310C/CH
is 4.5V
External Voltage Input for VCC (VCC_EXT)
The RT6310A/AH/B/BH/D/DH has VCC_EXT pin. In
order to reduce the power consumption, the internal
VCC regulator switchovers to VCC_EXT through the
VCC bypass switch if VCC_EXT pin is connected to an
external voltage larger than typical 4.7V. Once the
voltage of VCC_EXT pin is lower than typical 4.5V, the
VCC bypass switch is disconnected. The power logic of
VCC_EXT is shown in Table 2.
Power Good (PGOOD)
The PGOOD pin is an open-drain output. An external
pull-up resistor to VCC or other external rail is required,
and the recommended pull-up resistor ranges from 10k
to 100k. Do not pull the PGOOD voltage higher than 6V.
In order to prevent unwanted PGOOD glitches during
load transient or dynamic VOUT change, the RT6310
provides PGOOD low deglitch time with typical 20
s.
The PGOOD pin is pulled low when any of the following
specified events is triggered :
⚫
Input under-voltage-lockout (UVLO)
⚫
Output under/over-voltage protection (UVP/OVP)
⚫
Over-temperature protection (OTP)
⚫
EN/MODE pin is pulled low



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