RT6575A/B
Functional Pin Description
Pin No.
Pin Name
Pin Function
Current Limit Setting. Connect a resistor to GND to set the threshold for Channel 1
synchronous R
DS(ON)
sense. The GND
PHASE1 current limit threshold is 1/8th
the voltage seen at CS1 over a 0.2V to 2V range. There is an internal 10A
current source from LDO5 to CS1.
Feedback Voltage Input for Channel 1. Connect FB1 to a resistive voltage divider
from VOUT1 to GND to adjust output from 2V to 5.5V.
3.3V Linear Regulator Output. It is always on when VIN is higher than VINPOR
threshold.
Feedback Voltage Input for Channel 2. Connect FB2 to a resistive voltage divider
from VOUT2 to GND to adjust output from 2V to 4V.
Current Limit Setting. Connect a resistor to GND to set the threshold for Channel 2
synchronous R
DS(ON)
sense. The GND
PHASE2 current limit threshold is 1/8th
the voltage seen at CS2 over a 0.2V to 2V range. There is an internal 10A
current source from LDO5 to CS2.
Enable Control Input for Channel 2.
Power Good Indicator Output for Channel 1 and Channel 2. (Logical AND)
Switch Node of Channel 2 MOSFETs. PHASE2 is the internal lower supply rail for
the UGATE2 high-side gate driver. PHASE2 is also the current-sense input for the
Channel 2.
Bootstrap Supply for Channel 2 High-Side Gate Driver. Connect to an external
capacitor according to the typical application circuits.
High-Side Gate Driver Output for Channel 2. UGATE2 swings between PHASE2
and BOOT2.
Low-Side Gate Driver Output for Channel 2. LGATE2 swings between GND and
LDO5.
Power Input for 5V and 3.3V LDO Regulators and Buck Controllers.
5V Linear Regulator Output. LDO5 is also the supply voltage for the low-side
MOSFET and analog supply voltage for the device.
Switch-over Source Voltage Input for LDO5.
Low-Side Gate Driver Output for Channel 1. LGATE1 swings between GND and
LDO5.
High-Side Gate Driver Output for Channel 1. UGATE1 swings between PHASE1
and BOOT1.
Bootstrap Supply for Channel 1 High-Side Gate Driver. Connect to an external
capacitor according to the typical application circuits.
Switch Node of Channel 1 MOSFETs. PHASE1 is the internal lower supply rail for
the UGATE1 high-side gate driver. PHASE1 is also the current sense input for the
Channel 1.
Oscillator Output for Charge Pump.
Enable Control Input for Channel 1.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
1
CS1
2
3
4
FB1
LDO3
FB2
5
CS2
6
7
8
EN2
PGOOD
PHASE2
9
10
11
12
13
14
15
16
17
BOOT2
UGATE2
LGATE2
VIN
LDO5
BYP1
LGATE1
UGATE1
BOOT1
18
19
20
PHASE1
VCLK
EN1
21
GND
(Exposed Pad)
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6575A/B-03 February 2016
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
