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RT6318B bảng dữ liệu(PDF) 3 Page - Richtek Technology Corporation

tên linh kiện RT6318B
Giải thích chi tiết về linh kiện  8A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO
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nhà sản xuất  RICHTEK [Richtek Technology Corporation]
Trang chủ  http://www.richtek.com
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RT6318B/C
3
DS6318B/C-01 December 2021
www.richtek.com
©
Copyright 2021 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Functional Pin Description
pin No.
Pin Name
Pin Function
1
BOOT
Boot-strap pin. Supply high-side gate driver. A 0.1
F ceramic capacitor and
at least 10
 RBOOT are connected between this pin and LX pin.
2,3
LX
Inductor pin. Connect this pin to the switching node of inductor.
4
PGND
Power ground.
5
VIN
Input pin. Decouple this pin to GND pin with at least 10
F ceramic cap.
6
EN
(RT6318B)
Enable control. Pull this pin high to turn on the Buck. Do not leave this pin
floating. EN pin will also be used to set USM mode, when EN pin voltage is
between 0.8V and 1.7V, it will enter USM mode, if EN pin voltage is between
2.3V and 23V, then it is normal mode.
EN
(RT6318C)
Enable control. Pull this pin high to turn on the Buck. Do not leave this pin
floating. EN pin will also be used to set USM mode, when EN pin voltage is
between 0.8V and 1.7V, it will enter USM mode, if EN pin voltage is between
2.3V and 23V, then it is normal mode.
7
PGOOD
Power good indicator. Open drain output when the output voltage is higher
than 90% of regulation point.
8
AGND
Analog ground.
9
VCC
(RT6318B)
5V linear regulator output for internal control circuit. A capacitor (typical 1
F)
should be connected to AGND. Don’t connect to external Load.
FF
(RT6318C)
Output feedforward pin. Connect RC network from the output to this pin.
10
VOUT
(RT6318B)
Output pin. Connect to the output of DC-DC regulator. The pin also provides
the bypass input for 3.3V LDO.
VOUT
(RT6318C)
Output pin. Connect to the output of DC-DC regulator. The pin also provide
the bypass input for 5V LDO.
11
LDO3
(RT6318B)
Internal 3.3V LDO output. Bypass a capacitor to GND. This pin is also
capable sourcing 100mA current for external load.
VCC
(RT6318C)
5V linear regulator output for internal control circuit. A capacitor (typical 1
F)
should be connected to AGND. Don’t connect to external load.
12
FF
(RT6318B)
Output feedforward pin. Connect RC network from the output to this pin.
LDO5
(RT6318C)
Internal 5V LDO output. Bypass a capacitor to GND. This pin is also capable
sourcing 100mA current for external load.



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