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RT8857 Datasheet(PDF) 13 Page - Richtek Technology Corporation

Part # RT8857
Description  4/3/2/1-Phase PWM Controller with Embedded Drivers for CPU Core Power Supply
PDF  26 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8857 Datasheet(HTML) 13 Page - Richtek Technology Corporation

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RT8857/A
13
DS8857/A-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 error-amp and input of PWM comparator.
6
FB
Inverting input of error-amp.
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 channel 1, 2, 3 and 4.
15, 16, 19, 20
ISN4, ISN3, ISN2, ISN1 Negative current sense pin of channel 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 Channel 4 and Channel 3.
27, 35
BOOT2, BOOT1
Bootstrap Supply for Channel 2 and Channel 1.
28, 34
UGATE2, UGATE1
Upper Gate Driver for Channel 2 and Channel 1.
29, 33
PHASE2, PHASE1
Switching Node of Channel 2 and Channel 1.
30, 32
LGATE2, LGATE1
Lower Gate Driver for Channel 2 and Channel 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
VOUT
Feedback of Regulated Output.
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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