RT8885A 데이터 시트보기 (PDF) - Richtek Technology
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RT8885A
Richtek Technology
RT8885A Datasheet PDF : 59 Pages
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RT8885A
Pin No.
23
24
25
26
27
28
29
30
31
32
33
34
35, 39, 38
36, 40, 37
41
42
43
44
Pin Name
RSETA/OFSA
RSET/OFS
SET2
SET1
VCC
EN
VREF/QRTH
IMON
RGND
FB
COMP
VSEN
ISEN[3:1]N
ISEN[3:1]P
TONSET
PWM3
BOOT1
UGATE1
Pin Function
This pin provides three settings for GFX VR : internal compensation ramp
factor for control loop, output voltage offset and forced-DEM operation.
Connect a resistive voltage divider from VCC to GND and connect the joint
of the voltage divider to this pin.
This pin provides three settings for CORE VR : internal compensation
ramp factor for control loop, output voltage offset and forced-DEM
operation. Connect a resistive voltage divider from VCC to GND and
connect the joint of the voltage divider to this pin.
This pin provides three settings for GFX VR : initial startup voltage
VINI_GFX, maximum output current ICCMAXA and PWM on-time of quick
response for load transient response boost. Connect a resistive voltage
divider from VCC to GND, and connect the joint of the voltage divider to
this pin.
This pin provides three settings for CORE VR : Initial startup voltage
VINI_CORE, maximum output current ICCMAX and PWM on-time of quick
response for load transient response boost. Connect a resistive voltage
divider from VCC to GND and connect the joint of the voltage divider to
this pin.
Controller Power Supply Pin. Connect this pin to GND with a ceramic
capacitor larger than 1F.
Voltage Regulator Enable Signal Input.
This Pin Provides Two Functions : Fixed 0.6V Reference Voltage Output,
and Quick Response Trigger Threshold Setting. Connect a resistive
voltage divider from VCC to GND and connect the joint of the voltage
divider to this pin. Bypass this pin to GND with ceramic capacitor for noise
decoupling.
CORE VR Current Monitor Output. Connect a thermally compensated
resistor network from this pin to VREF/QRTH pin. IMON pin output voltage
VIMON is proportional to the total output current of CORE VR.
Return Ground for CORE VR. This pin is the inverting input node for
differential remote voltage sensing.
CORE VR Feedback Pin. This pin is the inverting input node of the error
amplifier.
CORE VR Compensation Pin. This pin is the output of the error amplifier.
CORE VR output voltage sensing pin. Voltage on this pin is monitored for
voltage related protections.
Negative Current Sense Input Pin for Channel 3, 2 and 1 of CORE VR.
ISENA2N and ISENA3N can be pulled high to VCC to disable CORE VR
channel 2 and channel 3, respectively. Connect to this pin with a sense
resistor of 680.
Positive current sense input for channel 3, 2 and 1 of CORE VR.
CORE VR PWM On-Time Setting Pin. Connect this pin to input voltage
VIN via a resistor to set the ripple size of CORE VR output in CCM.
CORE VR Channel 3 PWM Signal Output. Connect this pin to the PWM
input of external MOSFET driver for channel 3 of CORE VR.
CORE VR Channel 1 Bootstrap Flying Capacitor Connection Pin. This pin
powers channel 1 high side MOSFET drivers. Connect this pin to PHASE1
pin with a ceramic capacitor.
CORE VR Channel 1 High Side MOSFET Floating Gate Driver Output.
Connect this pin to the gate of high side MOSFET of channel 1.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
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is a registered trademark of Richtek Technology Corporation.
DS8885A-01 January 2014
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