RT8816B PWM Controller Datasheet

RT8816B Datasheet, PDF, Equivalent


Part Number

RT8816B

Description

Dual-Phase PWM Controller

Manufacture

Richtek

Total Page 21 Pages
Datasheet
Download RT8816B Datasheet


RT8816B
®
RT8816B
Dual-Phase PWM Controller with PWM-VID Reference
General Description
The RT8816B is a 2/1 phase synchronous Buck PWM
controller which is optimized for high performance graphic
microprocessor and computer applications. The IC
integrates a Constant-On-Time (COT) PWM controller, two
MOSFET drivers with internal bootstrap diodes, as well
as channel current balance and protection functions
including Over-Voltage Protection (OVP), Under-Voltage
Protection (UVP), current limit, and thermal shutdown into
the WQFN-20L 3x3 package.
The RT8816B adopts RDS(ON) current sensing technique.
Current limit is accomplished through continuous inductor-
current-sense, while RDS(ON) current sensing is used for
accurate channel current balance. Using the method of
current sampling utilizes the best advantages of each
technique.
The RT8816B features external reference input and PWM-
VID dynamic output voltage control, in which the feedback
voltage is regulated and tracks external input reference
voltage. Other features include adjustable switching
frequency, dynamic phase number control, internal soft-
start, power good indicator, and enable functions.
Ordering Information
RT8816B
Package Type
QW : WQFN-20L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
7J= : Product Code
7J=YM
DNN
YMDNN : Date Code
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
DS8816B-00 February 2018
Features
Dual-Phase PWM Controller
Power State Indicator
1P-CCM/2P-CCM/1P-DEM/2P-DEM
Two Embedded MOSFET Drivers and Embedded
Switching Boot Diode
Support 1.8V PWM-VID Interface
External Reference Input Control
PWM-VID Dynamic Voltage Control
Dynamic Phase Number Control
Lossless RDS(ON) Current Sensing for Current Balance
Internal/External Soft-Start
Adjustable Current Limit Threshold
Adjustable Switching Frequency
UVP/OVP Protection
Shoot Through Protection and Short Pulse Free
Technology
Support an Ultra-Low Output Voltage as Standby
Voltage
Thermal Shutdown
Power Good Indicator (EN to PG high = 500μs)
Applications
CPU/GPU Core Power Supply
Desktop PC Memory, VTT Power
Chipset/RAM Power Supply
Generic DC-DC Power Regulator
Pin Configuration
(TOP VIEW)
BOOT1
UGATE1
EN
PSI
VID
20 19 18 17 16
1 15 BOOT2
2 14 UGATE2
3 GND 13 PGOOD
4 21 12 OCSET/SS
5 11 VSNS
6 7 8 9 10
WQFN-20L 3x3
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8816B
RT8816B
Functional Pin Description
Pin No.
1
Pin Name
Pin Function
BOOT1
Bootstrap supply for PWM1. This pin powers the high-side MOSFET driver.
2
UGATE1
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.
3 EN
Enable control input. Active high input. When PVCC POR, the input voltage must
not be over PVCC.
4 PSI
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.
5 VID
Programming output voltage control input. Refer to PWM-VID Dynamic Voltage
Control.
6 REFADJ 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
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.
16 PHASE2 Connect this pin to the source of high-side MOSFET together with the drain of
low-side MOSFET and the inductor.
17
LGATE2
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.
18
PVCC
Supply voltage input. Connect this pin to a 5V bias supply. Place a high quality
bypass capacitor from this pin to GND.
19
LGATE1
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.
20 PHASE1 Connect this pin to the Source of high-side MOSFET together with the drain of
low-side MOSFET and the inductor.
21
(Exposed Pad)
GND
Ground. The Exposed pad should be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8816B-00 February 2018


Features ® RT8816B Dual-Phase PWM Controller wi th PWM-VID Reference General Descripti on The RT8816B is a 2/1 phase synchrono us Buck PWM controller which is optimiz ed for high performance graphic micropr ocessor and computer applications. The IC integrates a Constant-On-Time (COT) PWM controller, two MOSFET drivers with internal bootstrap diodes, as well as channel current balance and protection functions including Over-Voltage Protec tion (OVP), Under-Voltage Protection (U VP), current limit, and thermal shutdow n into the WQFN-20L 3x3 package. The RT 8816B adopts RDS(ON) current sensing te chnique. Current limit is accomplished through continuous inductorcurrent-sens e, while RDS(ON) current sensing is use d for accurate channel current balance. Using the method of current sampling u tilizes the best advantages of each tec hnique. The RT8816B features external r eference input and PWMVID dynamic outpu t voltage control, in which the feedbac k voltage is regulated and tracks external input reference volta.
Keywords RT8816B, datasheet, pdf, Richtek, Dual-Phase, PWM, Controller, T8816B, 8816B, 816B, RT8816, RT881, RT88, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)