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  Richtek Technology Electronic Components Datasheet  

RT8811B Datasheet

Dual-Phase COT Buck PWM Controller

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®
RT8811B
Dual-Phase COT Buck PWM Controller with Dynamic Voltage
Control
General Description
The RT8811B 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-24L 4x4 package.
The RT8811B 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 RT8811B 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/external
soft-start, power good indicator, and enable functions.
Features
Dual-Phase PWM Controller
Two Embedded MOSFET Drivers and Embedded
Switching Boot Diode
External Reference Input Control
PWM-VID Dynamic Voltage Control
Dynamic Phase Number Control
Lossless RDS(ON) Current Sensing for Current Balance
Internal Fixed and External Adjustable Soft-Start
Built-In 220mA 5V LDO
Adjustable Current Limit Threshold
Adjustable Switching Frequency
UVP/OVP Protection
Shoot-Through Protection and Short Pulse Free
Technology
Single IC Supply Voltage : 4.5V to 13.2V
Support an Ultra-Low Output Voltage as Standby
Voltage
Thermal Shutdown
Thermal Alert Indicator
Power Good Indicator
RoHS Compliant and Halogen Free
Simplified Application Circuit
VPVCC
VIN
PGOOD
RT8811B
PVCC
BOOT1
UGATE1
TON
PHASE1
LGATE1
PGOOD
PSI
VID
EN
BOOT2
UGATE2
PHASE2
LGATE2
GND RGND
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8811B-00 November 2013
VIN
VOUT
VIN
VGND_SNS
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8811B Datasheet

Dual-Phase COT Buck PWM Controller

No Preview Available !

RT8811B
Applications
Motherboard to High End GPU Core Power
High End Desktop PC Memory Core Power
Low Voltage. High Current DC/DC Converter
Voltage Regulator Modules
Marking Information
1L= : Product Code
1L=YM
DNN
YMDNN : Date Code
Ordering Information
RT8811B
Package Type
QW : WQFN-24L 4x4 (W-Type)
(Exposed Pad-Option 1)
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.
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
BOOT1 1
18 BOOT2
UGATE1 2
17 UGATE2
EN 3
PSI 4
GND
16 PGOOD
15 VCC
VID 5
25 14 TALERT
REFADJ 6
13 TSNS
7 8 9 10 11 12
WQFN-24L 4x4
Function Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
Pin Name
BOOT1
UGATE1
EN
PSI
VID
REFADJ
REFIN
VREF
TON
RGND
VSNS
Pin Function
Bootstrap Supply for PWM 1. This pin powers the high-side MOSFET driver.
High-Side Driver of PWM 1. 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. Drive EN higher than 1.6V to turn on the controller, lower
than 0.8V to turn it off. If the EN pin is open, it will be pulled high by internal
circuit.
Power Saving Interface. When the voltage is pulled below 0.8V, the device will
operate into 1 phase DEM. When the voltage is pulled between 1.2V to 1.8V,
the controller will switch operation into 1 phase force CCM. When the voltage
is between 2.4V to 5.5V, the device will operate into 2 phases force CCM.
Programming Output Voltage Control Input. Refer to PWM-VID Dynamic
Voltage Control.
Reference Adjustment Output. Refer to PWM-VID Dynamic Voltage Control.
External Reference Input.
Reference Voltage Output. This is a high precision voltage reference (2V) from
VREF pin to RGND pin.
ON-Time/Switching Frequency Adjustment Input. Connect a 100pF ceramic
capacitor between CTON and ground is optional for noise immunity
enhancement
Negative Remote Sense Input. Connect this pin to the ground of output load.
Positive Remote Sense Input. Connect this pin to the positive terminal of
output load.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8811B-00 November 2013


Part Number RT8811B
Description Dual-Phase COT Buck PWM Controller
Maker Richtek
Total Page 23 Pages
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