RT6310CSLASHCH datasheet(5/54 Pages) RICHTEK

5 / 54 page

RT6310

is a registered trademark of Richtek Technology Corporation.

DS6310-04

August 2023

www.richtek.com

Pin No.

Pin Name

Pin Function

(RT6310A/AH)

(RT6310D/DH)

Feedback voltage input. A resistor divider from VOUT to FB sets the desired VOUT

level. VOUT is regulated by FB tracking internal reference voltage 0.6V. Further, FB

is used to detect output voltage status for OVP, UVP or PGOOD. If FB voltage is

below 60% of internal reference 0.6V, the UVP is triggered. If FB voltage is greater

than 120% of internal reference 0.6V, the OVP is triggered. After soft-start is

completed, if FB voltage is greater than 90% of internal reference 0.6V, PGOOD is

pulled high. Conversely, if FB voltage is below 74% of internal reference 0.6V,

PGOOD is pulled low.

VCC_EXT

(RT6310B/BH)

External voltage input for VCC. If an external 5V supply voltage is applied to

VCC_EXT pin, VCC will be internally switchover to VCC_EXT pin and the internal

LDO of VCC will be disabled for further reducing the power consumption. Notice,

in order to avoid any noise disturbance including switching noise, an external 5V

supply voltage must be stable and constant. Hence, a RC filter (R = 1.1

/0603 and

C = 4.7

F/0603) is required between an external 5V supply voltage and the

VCC_EXT pin. It should be placed as close as possible to the VCC_EXT pin. Leave

the VCC_EXT pin floating if this pin is not used.

(RT6310C/CH)

Output feedforward pin. FF pin is connected between internal divider resistors. A

proper feedforward capacitor connecting from VOUT pin to FF pin can enhance the

transient performance. Furthermore, FF pin is used to detect output voltage status

for OVP, UVP or PGOOD. If FF voltage is below 60% of internal reference 1.7V,

the UVP is triggered. If FF voltage is greater than 120% of internal reference 1.7V,

the OVP is triggered. After soft-start is completed, if FF voltage is greater than 90%

of internal reference 1.7V, PGOOD is pulled high. Conversely, if FF voltage is below

77% of internal reference 1.7V, PGOOD is pulled low.

VCC_EXT

(RT6310A/AH)

(RT6310D/DH)

External voltage input for VCC. If an external 5V supply voltage is applied to

VCC_EXT pin, VCC will be internally switchover to VCC_EXT pin and the internal

LDO of VCC will be disabled for further reducing the power consumption. Notice,

in order to avoid any noise disturbance including switching noise, an external 5V

supply voltage must be stable and constant. Hence, a RC filter (R = 1.1

/0603 and

C = 4.7

F/0603) is required between an external 5V supply voltage and the

VCC_EXT pin. It should be placed as close as possible to the VCC_EXT pin. Leave

the VCC_EXT pin floating if this pin is not used.

VOUT

(RT6310B/BH)

Output voltage sense pin. Connect to the output of buck converter. LDO3 (3.3V)

will be internally switchover to VOUT pin when the LDO bypass switch is turned on.

Furthermore, VOUT pin is used to detect output voltage status for OVP, UVP or

PGOOD. If output voltage is below 60% of fixed output voltage 3.3V, the UVP is

triggered. If output voltage is greater than 120% of fixed output voltage 3.3V, the

OVP is triggered. After soft-start is completed, if output voltage is greater than 90%

of fixed output voltage 3.3V, PGOOD is pulled high. Conversely, if output voltage is

below 77% of fixed output voltage 3.3V, PGOOD is pulled low.

VOUT

(RT6310C/CH)

Output voltage sense pin. Connect to the output of buck converter. LDO5 (5V) and

VCC will be internally switchover to VOUT pin when the VCC and LDO bypass

switches are turned on.

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