RT8856
Functional Pin Description
Pin No.
Pin Name
DPRSLPVR
VRON
Pin Function
Deeper Sleep Mode Signal. Together with PSI, the combination of these two pins
indicates the power management states.
1
2
3
Voltage Regulator Enabler.
Frequency Setting. Connect this pin with a resistor to ground to set the operating
frequency.
FS
Current Monitor Output. This pin outputs a voltage proportional to the output
current.
4
5
CM
Current Monitor Output Gain Externally Setting. Connect this pin with one resistor
to VSEN while CM pin is connected to ground with another resistor. The current
monitor output gain can be set by the ratio of these two resistors.
Voltage ID. DAC voltage identification inputs for IMVP6.5.
The logic threshold is 30% of VCCP as the maximum value for low state and 70%
of VCCP as the minimum value for the high state. VCCP is 1.05V.
Power Status Indicator II. Together with DPRSLPVR, the combination of these two
pins indicates the power management states.
CMSET
6 to 12
13
VID[6:0]
PSI
14
15
COMP
FB
Compensation. This pin is the output node of the error amplifier.
Feedback. This is the negative input node of the error amplifier.
Positive Voltage Sensing Pin. This pin is the positive node of the differential
voltage sensing.
16
17
VSEN
RGND
Return Ground. This pin is the negative node of the differential remote voltage
sensing.
Soft-Start. This pin provides soft-start function and slew rate control. The
capacitance of the slew rate control capacitor is restricted to be larger than 10nF.
The feedback voltage of the converter follows the ramping voltage on the SOFT pin
during soft-start and other voltage transitions according to different modes of
operation and VID change.
18
SOFT
19
20
ISEN1
Positive Input of Phase1 Current Sense.
ISEN1_N
Negative Input of Phase1 Current Sense.
Bootstrap Power Pin of Phase1. This pin powers the high side MOSFET drivers.
Connect this pin to the junction of the bootstrap capacitor with the cathode of the
bootstrap diode. Connect the anode of the bootstrap diode to the PVCC pin.
Upper Gate Drive of Phase1. This pin drives the gate of the high side MOSFETs.
Return Node of Phase1 High Side Driver. Connect this pin to high side MOSFET
sources together with the low side MOSFET drains and the inductor.
Driver Ground of Phase1.
21
BOOT1
22
23
UGATE1
PHASE1
24
25
26
27
28
PGND1
LGATE1
PVCC
Lower Gate Drive of Phase1. This pin drives the gate of the low side MOSFETs.
Driver Power.
LGATE2
PGND2
Lower Gate Drive of Phase2. This pin drives the gate of the low side MOSFETs.
Driver Ground of Phase2.
Return Node of Phase2 High Side Driver. Connect this pin to high side MOSFET
sources together with the low side MOSFET drains and the inductor.
29
PHASE2
Copyright 2015 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS8856-05 July 2015
www.richtek.com
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