RT5701
Functional Pin Description
Pin No.
Pin Name
Pin Function
Nominal VOUT setting select input pin.
VSEL = Low selects {0x11.ENSEL0, 0x11.VoutSEL0[6:0], 0x14.PWM0,
0x1D.VOUT_BANK0[1:0]}.
VSEL = High selects {0x10.ENSEL1, 0x10.VoutSEL1[6:0], 0x14.PWM1,
0x1C.VOUT_BANK1[1:0]}.
If 0x1C.VOUT_BANK1[1:0]
≠
0x1D.VOUT_BANK0[1:0], do not toggle VSEL
when EN = High.
Enable Control Input. The IC enable control pin turns on the step-down
converter if the internal register ENSEL bit = 1. If ENSEL = 0, EN goes high still
cannot enable step-down converter. The EN pin includes a internal pull-down
current about 1μA. When IC protection occurs and is latched in shutdown state,
toggling EN or re-power AVDD can reset the latch state.
I C Interface Clock Input.
Remote Ground Sense Input.
Step-Down Converter Output Voltage Sense Input.
No Internal Connection.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Analog and I C Interface Power Input.
Power Input. Input capacitor C
IN
must be placed as close to IC as possible.
Switch Node.
I C Interface Data Input.
2
2
2
1
VSEL
2
EN
3
4
5
6, 10
13,15
(Exposed Pad)
7
8, 9
11,12
14
SCL
GNDR
VOUT
NC
GND
AVDD
PVIN
LX
SDA
Functional Block Diagram
AVDD
PVIN
VSEL
E-Fuse
Bandgap
UVLO
Bias Supply
Thermal
Shutdown
Current Limit Detect
EN
Register File
DVS
VREF
PWM Control Logic
Gate Driver
LX
SCL
I C
SDA
2
FB
Soft-Start
Negative Inductor
Current Detect
Oscillator
GNDR
VOUT
GND
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS5701-02 March 2018
www.richtek.com
3
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