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]}.
1
VSEL
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 1A. When IC protection occurs and is latched in shutdown state,
toggling EN or re-power AVDD can reset the latch state.
2
EN
3
4
SCL
I2C Interface Clock Input.
GNDR
VOUT
NC
Remote Ground Sense Input.
Step-Down Converter Output Voltage Sense Input.
No Internal Connection.
5
6, 10
13,15
(Exposed Pad)
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
GND
7
AVDD
Analog and I2C Interface Power Input.
8, 9
11,12
14
PVIN
LX
Power Input. Input capacitor CIN must be placed as close to IC as possible.
Switch Node.
I2C Interface Data Input.
SDA
Functional Block Diagram
AVDD
PVIN
VSEL
UVLO
Bias Supply
Thermal
Shutdown
E-Fuse
Bandgap
DVS
Current Limit Detect
Gate Driver
VREF
EN
Register File
LX
PWM Control Logic
SCL
SDA
FB
2
Soft-Start
I C
Negative Inductor
Current Detect
Oscillator
GNDR
VOUT
GND
Copyright 2015 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS5701-01 July 2015
www.richtek.com
3
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