RT8868A 데이터 시트보기 (PDF) - Richtek Technology
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RT8868A Datasheet PDF : 21 Pages
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RT8868A
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
PWROK
PWROK Input Signal.
2
RT
Connect this Pin to GND by a Resistor to Adjust Frequency.
3
FBRTN
Remote Sense Ground for CORE.
4
FBRTN_NB
Remote Sense Ground for NB.
5
FB_NB
Inverting Input of Error-Amp for NB.
6
COMP_NB
Output of Error-Amp and Input of PWM Comparator for NB.
7
ISP_NB
Positive Current Sense Pin of NB.
8
ISN_NB
9
ADJ
10
OFS
11
COMP
12
FB
13
IMAX_NB
14
IMAX
15, 17, 19, 21 ISN1, ISN2, ISN3, ISN4
16, 18, 20, 22 ISP1, ISP2, ISP3, ISP4
Negative Current Sense Pin of NB.
Connect this Pin to GND by a Resistor to set Load Line of
VCORE.
Connect this Pin to 5VCC by a Resistor to set No-Load Offset
Voltage of VCORE.
Output of Error-Amp and Input of PWM Comparator of VCORE.
Inverting Input of Error-Amp of VCORE.
Connect this Pin to GND by a Resistor to set OCP of NB.
Connect this Pin to GND by a Resistor to set OCP of VCORE.
Negative Current Sense Pin of Channel 1, 2, 3 and 4.
Positive Current Sense Pin of Channel 1, 2, 3 and 4.
23
24
25,26
PS
VCC5
PWM4, PWM3
Power Saving Mode Selection Pin.
Output of Internal 5V Regulator for Control Circuits Power
Supply. Connect this Pin to GND by a Ceramic Capacitor Larger
than 1μF.
PWM Output for Channel 4 and Channel 3.
27, 35, 36 BOOT2, BOOT1, BOOT_NB Bootstrap Supply for Channel 2 and Channel 1 and NB.
28, 34, 37 UGATE2, UGATE1, UGATE_NB Upper Gate Driver for Channel 2 and Channel 1 and NB.
29, 33, 38 PHASE2, PHASE1, PHASE_NB Switching Node of Channel 2 and Channel 1 and NB.
30, 32, 39 LGATE2, LGATE1, LGATE_NB Lower Gate Driver for Channel 2 and Channel 1 and NB.
31, 40
41
VCC12, VCC12_NB
VID0/VFIXEN
42
VID1/PVI
43
44
45, 46
VID2/SVD
VID3/SVC
VID4, VID5
IC Power Supply. Connect this pin to 12V.
PVI Mode : Used as Voltage Identification Input for DAC.
SVI Mode : Functions as VFIXEN Selection Input.
This Pin Selects PVI/SVI Mode Based on the State of this Pin
Prior to EN Signal.
PVI Mode : Used as Voltage Identification Input for DAC.
PVI Mode : Used as Voltage Identification Input for DAC.
SVI Mode : Serial Data Input.
PVI Mode : Used as Voltage Identification Input for DAC.
SVI Mode : Serial Clock Input.
PVI Mode : Used as Voltage Identification Input for DAC.
47
PGOOD
Power Good Indicator (open drain).
48
EN
49
(Exposed pad)
GND
Enable Input Signal.
Reference Ground for the IC. The exposed pad must be
soldered to a large PCB and connected to GND for maximum
power dissipation.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8868A-00 May 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
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