DS8816A Datasheet, PDF (2/21 Pages) Richtek Technology Corporation – Dual-Phase PWM Controller with PWM-VID Reference

RT8816A
Functional Pin Description
Pin No.
1
2
3
4
5
6
Pin Name
BOOT1
UGATE1
EN
PSI
VID
REFADJ
Pin Function
Bootstrap supply for PWM1. This pin powers the high-side MOSFET driver.
High-side gate driver of PWM1. This pin provides the gate drive for the converter's
high-side MOSFET. Connect this pin to the gate of high-side MOSFET.
Enable control input. Active high input. When PVCC POR, the input voltage must
not be over PVCC.
Power saving interface. When the voltage is pulled below 0.4V, the device will
operate into 1 phase DEM. When the voltage is between 0.7V to 0.88V, the device
will operate into 1 phase force CCM. When the voltage is between 1.08V to 1.35V,
the device will operate into 2 phase DEM. When the voltage is between 1.6V to
5.5V, the device will operate into 2 phase force CCM.
Programming output voltage control input. Refer to PWM-VID Dynamic Voltage
Control.
Reference adjustment output. Refer to PWM-VID Dynamic Voltage Control.
7
REFIN
External reference input.
8
VREF
Reference voltage output. This is a high precision voltage reference (2V) from the
VREF pin to RGND pin.
9
TON
On-time/switching frequency adjustment input. Connect a 100pF ceramic
capacitor between CTON and ground is optional for noise immunity enhancement.
10
RGND
Negative remote sense input. Connect this pin to the ground of output load.
11
VSNS
Positive remote sense input. Connect this pin to the positive terminal of output
load.
Current limit setting. Connect a resistor from OCSET/SS to GND to set the current
12
OCSET/SS limit threshold. The external soft start time also can be set through by connecting a
capacitor from OCSET/SS pin to GND.
13
PGOOD Power good indicator output. Active high open-drain output.
14
UGATE2
High-side gate driver of PWM2. This pin provides the gate drive for the converter's
high-side MOSFET. Connect this pin to the gate of high-side MOSFET.
15
BOOT2
16
PHASE2
17
LGATE2
18
PVCC
19
LGATE1
20
PHASE1
21
(Exposed Pad)
GND
Bootstrap supply for PWM2. This pin powers the high-side MOSFET driver.
Switch node for PWM2. This pin is return node of the high-side driver of PWM 2.
Connect this pin to the source of high-side MOSFET together with the drain of
low-side MOSFET and the inductor.
Low-side gate driver of PWM2. This pin provides the gate drive for the converter's
low-side MOSFET. Connect this pin to the gate of low-side MOSFET.
Supply voltage input. Connect this pin to a 5V bias supply. Place a high quality
bypass capacitor from this pin to GND.
Low-side gate driver of PWM1. This pin provides the gate drive for the converter's
low-side MOSFET. Connect this pin to the gate of low-side MOSFET.
Switch node for PWM1. This pin is return node of the high-side driver of PWM 1.
Connect this pin to the Source of high-side MOSFET together with the drain of
low-side MOSFET and the inductor.
Ground. The Exposed pad should be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8816A-00 September 2016