RT8859M 데이터 시트보기 (PDF) - Richtek Technology
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RT8859M Datasheet PDF : 51 Pages
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RT8859M
Pin No.
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51, 52, 54, 53
55
56
57 (Exposed Pad)
Pin Name
FBA
COMPA
ISENAN
ISENAP
QRSETA
PW MA
EN
VRA_RDY
VR_RDY
VCC
OCSETA
OCSET
TSENA
TSEN
VRHOT
DVDA
DVD
TONSETA
TONSET
PW M [4 :1]
QRSET
DVIDA
GND
Pin Function
Single-Phase AXG VR Feedback. This is the negative input node of the
error amplifier.
Single-Phase AXG VR Compensation. This pin is the output node of the
error amplifier.
Negative Current Sense Pin of Single-Phase AXG VR.
Positive Current Sense Pin of Single-Phase AXG VR.
Single-Phase AXG VR Quick Response Time Setting.
PWM Output for Single-Phase AXG VR.
Chip Enable (Active High)
VR Ready Indicator of Single-Phase AXG VR.
VR Ready Indicator of Multi-Phase CORE VR.
Chip Power. Connect this pin to 5V via an RC filter.
Single-Phase AXG VR Over Current Protection Setting. Place a
resistive voltage divider between VCC and ground and connect the joint
of the voltage divider to the OCSETA pin. The voltage at the OCSET pin
determines the over current threshold, ILIMITA.
Multi-Phase CORE VR Over Current Protection Setting. Place a
resistive voltage divider between VCC and ground and connect the joint
of the voltage divider to the OCSET pin. The voltage at the OCSET pin
determines the over current threshold, ILIMIT.
Thermal Monitor Sense Point of AXG VR.
Thermal Monitor Sense Point of CORE VR.
Thermal Monitor Output (Active Low).
Divided Voltage Detection of AXG VR. Connect this pin to a voltage
divider from the single-phase power stage input power for input voltage
detection.
Divided Voltage Detection of CORE VR. Connect this pin to a voltage
divider from the multi-phase power stage input power for input voltage
detection.
Single-Phase AXG VR On-Time Setting. Connect this pin to VIN with
one resistor to set ripple size in PWM mode.
Multi-Phase CORE VR On-Time Setting. Connect this pin to VIN with
one resistor to set ripple size in PWM mode.
PWM Output for CH1, 2, 3 and 4.
Multi-Phase CORE VR Quick Response Time Setting.
Connect a resistor and a capacitor from this pin to GND to improve
DVID performance. Short this pin to GND if this function is not needed.
Ground. 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.
DS8859M-05 July 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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