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RT8862 Datasheet(PDF) 13 Page - Richtek Technology Corporation

Part # RT8862
Description  Advanced 4/3/2/1-Phase PWM Controller with Embedded Drivers for CPU Core Power Supply
PDF  29 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8862 Datasheet(HTML) 13 Page - Richtek Technology Corporation

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RT8862
13
DS8862-01 April 2011
www.richtek.com
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
FBRTN
Negative Remote Sense Pin of Output Voltage.
2
QR1
Quick Response Setting Pins for Load Transition.
3
QR2
Quick Response Setting Pins for Load Transition.
4
SS/EN
Connect this pin to GND by a capacitor to adjust soft start time.
Pull this pin to GND to disable controller.
5
COMP
Output of the Error-Amplifier and Input of the PWM Comparator.
6
FB
Inverting Input of the Error-Amplifier.
7
OFS
Connect this pin to GND or 5V by a resistor to set no-load offset
voltage.
8
RT
Connect this Pin to GND by a Resistor to Adjust Frequency.
9
ADJ
Connect this Pin to GND by a Resistor to Set Load Line.
10
IMAX
Negative Input of OCP Comparator. (Positive input of OCP
comparator is ADJ).
11
IMAXPSI
OCP Setting in Power Saving Mode.
12
IMONFB
Current Monitor Gain/Offset Adjustment.
13
IMON
Current Monitor Output.
14, 17, 18, 21
ISP4, ISP3, ISP2, ISP1 Positive Current Sense Pin of phase 1, 2, 3 and 4.
15, 16, 19, 20
ISN4, ISN3, ISN2, ISN1 Negative Current Sense Pin of phase 1, 2, 3 and 4.
22
VRHOT
Temperature Monitor Output.
23
TSEN
Temperature Sense Input.
24
VCC5
5V LDO Output for System Power Supply.
25, 26
PWM4, PWM3
PWM Output for Phase 4 and Phase 3.
27, 35
BOOT2, BOOT1
Bootstrap Supply for Phase 2 and Phase 1.
28, 34
UGATE2, UGATE1
Upper Gate Driver for Phase 2 and Phase 1.
29, 33
PHASE2, PHASE1
Switching Node of Phase 2 and Phase 1.
30, 32
LGATE2, LGATE1
Lower Gate Driver for Phase 2 and Phase 1.
31
VCC12
IC Power Supply. Connect to 12V.
36
PWRGD
Power Good Indicator.
37
EN/VTT
VTT Voltage Detector Input.
38 to 45
VID7 to VID0
Voltage Identification Input for DAC.
47
PSI
Power Status Indicator II.
48
PS
Dynamic Phase Control Threshold Input.
46
VIDSEL
VID DAC Selection Pin.
49
(Exposed pad)
GND
The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
VIDSEL
VID [7]
Table
VTT
X
VR11
GND
X
VR10.x
VCC5
VTT
K8
VCC5
GND
K8_M2
VID Table Selection



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