®
RT8811A
Dual-Phase COT Buck PWM Controller with Dynamic Voltage Control
General Description
The RT8811A is a dual-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 RT8811A 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 RT8811A features external reference input and PWMVID 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
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RT8811A |
VIN |
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PVCC |
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BOOT1 |
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UGATE1 |
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TON |
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PHASE1 |
VOUT |
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LGATE1 |
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PGOOD |
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VIN |
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BOOT2 |
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PSI |
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UGATE2 |
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VID |
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PHASE2 |
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EN |
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LGATE2 |
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GND |
RGND |
VGND_SNS |
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Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8811A-02 March 2014 |
www.richtek.com |
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1 |
RT8811A
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
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0T= : Product Code |
0T=YM |
YMDNN : Date Code |
DNN |
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Ordering Information
RT8811A 
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 requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Pin Configurations
(TOP VIEW)
PHASE1 LGATE1 GND PVCC LGATE2 PHASE2 |
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24 |
23 |
22 |
21 |
20 |
19 |
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BOOT1 1 |
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18 |
BOOT2 |
UGATE1 2 |
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17 |
UGATE2 |
EN 3 |
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GND |
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16 |
PGOOD |
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PSI 4 |
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15 |
VCC |
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VID 5 |
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25 |
14 |
TALERT |
REFADJ 6 |
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13 |
TSNS |
7 |
8 |
9 |
10 |
11 |
12 |
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REFIN |
VREF |
TON |
RGND |
VSNS |
SS |
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WQFN-24L 4x4 |
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Function Pin Description
Pin No. |
Pin Name |
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Pin Function |
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1 |
BOOT1 |
Bootstrap Supply for PWM 1. This pin powers the high-side MOSFET driver. |
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High-Side Driver of PWM 1. This pin provides the gate drive for the |
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2 |
UGATE1 |
converter's high-side MOSFET. Connect this pin to the Gate of high-side |
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MOSFET. |
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Enable Control Input. Drive EN higher than 1.6V to turn on the controller, |
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3 |
EN |
lower than 0.8V to turn it off. If the EN pin is open, it will be pulled to high by |
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internal circuit. |
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Power Saving Interface. When the voltage is pulled below 0.8V, the device |
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4 |
PSI |
will operate into 1 phase DEM. When the voltage is between 2.4V to 5.5V, the |
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device will operate into 2 phases force CCM. |
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5 |
VID |
Programming Output |
Voltage Control Input. Refer to PWM-VID Dynamic |
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Voltage Control. |
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6 |
REFADJ |
Reference Adjustment Output. Refer to PWM-VID Dynamic Voltage Control. |
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7 |
REFIN |
External Reference Input. |
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8 |
VREF |
Reference Voltage Output. This is a high precision voltage reference (2V) |
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from the VREF pin to the RGND pin. |
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9 |
TON |
ON-Time/Switching Frequency Adjustment Input. |
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10 |
RGND |
Negative Remote Sense Input. Connect this pin to the ground of output load. |
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11 |
VSNS |
Positive Remote Sense Input. Connect this pin to the positive terminal of |
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output load. |
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Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
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www.richtek.com |
DS8811A-02 March 2014 |
2 |
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RT8811A |
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Pin No. |
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Pin Name |
Pin Function |
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Soft-Start Time Setting. Connect an external capacitor to adjust soft-start |
12 |
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SS |
time. When the external capacitor is removed, the internal soft-start function |
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will be chose. |
13 |
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TSNS |
Temperature Sensing Input. |
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14 |
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Thermal Alert. Active low open-drain output. |
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TALERT |
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15 |
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VCC |
LDO Regulator Output. Connect a minimum 4.7 F ceramic capacitor between |
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this pin and ground. |
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16 |
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PGOOD |
Power Good Indicator Output. Active high open-drain output. |
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17 |
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UGATE2 |
High-Side Driver of PWM 2. This pin provides the gate drive for the |
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converter's high-side MOSFET. Connect this pin to the high-side MOSFET. |
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18 |
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BOOT2 |
Bootstrap Supply for PWM 2. This pin powers the high-side MOSFET driver. |
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19 |
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PHASE2 |
Switch Node for PWM2. Connect this pin to the Source of high-side MOSFET |
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together with the Drain of low-side MOSFET and the inductor. |
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20 |
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LGATE2 |
Low-Side Driver of PWM 2. This pin provides the gate drive for the converter's |
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low-side MOSFET. Connect this pin to the low-side MOSFET. |
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21 |
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PVCC |
Supply Voltage Input. Place a high quality bypass capacitor from this pin to |
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GND. |
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22, |
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Ground. Must be connected to GND on PCB. The Exposed pad should be |
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GND |
soldered to a large PCB and connected to GND for maximum thermal |
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25 (Exposed Pad) |
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dissipation. |
23 |
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LGATE1 |
Low-Side Driver of PWM 1. This pin provides the gate drive for the converter's |
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low-side MOSFET. Connect this pin to the Gate of low-side MOSFET. |
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24 |
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PHASE1 |
Switch Node for PWM1. Connect this pin to the Source of high-side MOSFET |
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together with the Drain of low-side MOSFET and the inductor. |
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Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8811A-02 March 2014 |
www.richtek.com |
|
3 |
RT8811A
Function Block Diagram
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VREF |
RGND |
VCC |
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Reference Output |
Internal |
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PVCC |
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VID |
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Gen. & BG |
Regulator |
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REFADJ |
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RGND |
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Power On Reset VCC |
VA |
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Mode Select |
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PSI |
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OV |
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& Central Logic |
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PGOOD |
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REFIN |
150% REFIN |
+ |
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UV |
- |
Control & Protection Logic |
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40% REFIN |
+ |
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Soft-Start |
- |
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Boot-Phase |
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PWM |
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Detection 1 |
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& Slew Rate |
CMP |
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Control |
+ |
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Boot-Phase |
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VSNS |
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- |
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VA |
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Detection 2 |
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BOOT1 |
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2µA |
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TON |
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UGATE1 |
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Gen 1 |
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PHASE1 |
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Enable |
To Driver Logic |
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PWM1 |
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EN |
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LGATE1 |
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Logic |
To Power On Reset |
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Driver |
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VIN |
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TON |
PWM2 |
Logic |
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BOOT2 |
TON |
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To Power On Reset |
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UGATE2 |
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Detection |
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Gen 2 |
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PHASE2 |
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TALERT |
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LGATE2 |
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TSNS |
1V |
+ |
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- |
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S/H |
+ |
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VB |
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Internal |
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Current |
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- |
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Die Temperature |
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Balance |
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S/H |
+ |
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Sense |
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- |
VB |
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Current |
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Limit |
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Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8811A-02 March 2014 |
4 |
|
RT8811A
Operation
The RT8811Aintegrates a Constant-On-Time (COT) PWM controller, the controller provides the PWM signal which relies on the output ripple voltage comparing with internal reference voltage. Referring to the function block diagram of TONGenx, the synchronous UGATE driver is turned on at the beginning of each cycle. After the internal one-shot timer expires, the UGATE driver will be turned off. The pulse width of this one-shot is determined by the converter's input voltage and the output voltage to keep the frequency fairly constant over the input voltage and output voltage range. Another one-shot sets a minimum off-time.
The RT8811A also features a PWM-VID dynamic voltage control circuit driven by the pulse width modulation method. This circuit reduces the device pin count and enables a wide dynamic voltage range.
Current Balance
The RT8811A implements the internal current balance mechanism in the current loop. The RT8811A senses per phase current and compares it with the average current. If the sensed current of any particular phase is higher than average current, the on-time of this phase will be adjusted to be shorter.
PGOOD
The power good output is an open-drain architecture.
When the soft-start is finished, the PGOOD open-drain output will be high impedance.
Soft-Start (SS)
For internal soft-start function, an internal current source charges an internal capacitor to build the soft-start ramp voltage. The output voltage will track the internal ramp voltage during soft-start interval.
For external soft-start function, an additional capacitor connected from SS to GND will be charged by a current source and determines the soft-start time.
Current Limit
The current limit circuit employs a unique “valley” current sensing algorithm. If the magnitude of the current sense signal at PHASE is above the current limit threshold, the PWM is not allowed to initiate a new cycle. Thus, the current to the load exceeds the average output inductor current, the output voltage falls and eventually crosses the under-voltage protection threshold, inducing IC shutdown.
Over-Voltage Protection (OVP)
The output voltage can be continuously monitored for overvoltage protection. When the output voltage exceeds its set voltage threshold (If VREFIN ≤ 1.33V, OV = 2V, or VREFIN > 1.33V, OV = 1.5 x VREFIN), UGATE goes low and LGATE is forced high. The controller is latched until VCC is resupplied and exceeds the POR rising threshold voltage.
Under-Voltage Protection (UVP)
The output voltage is continuously monitored for undervoltage protection. When the output voltage is less than 40% of its set voltage, under-voltage protection is triggered and then both UGATE and LGATE gate drivers are forced low. The controller is latched until VCC is re-supplied and exceeds the POR rising threshold voltage.
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8811A-02 March 2014 |
www.richtek.com |
|
5 |
RT8811A
Absolute Maximum Ratings |
(Note 1) |
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TONtoGND ------------------------------------------------------------------------------------------------------- |
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−0.3 to 32V |
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PVCC to GND ---------------------------------------------------------------------------------------------------- |
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−0.3 to 15V |
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RGNDtoGND ---------------------------------------------------------------------------------------------------- |
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−0.7V to 0.7V |
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PHASEx to GND |
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DC ------------------------------------------------------------------------------------------------------------------- |
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−0.3V to 26V |
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<20ns -------------------------------------------------------------------------------------------------------------- |
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−8V to 38V |
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BOOTx to PHASEx --------------------------------------------------------------------------------------------- |
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15V |
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UGATEx to GND |
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DC ------------------------------------------------------------------------------------------------------------------- |
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0.3V to (VBOOT + 0.3V) |
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<20ns -------------------------------------------------------------------------------------------------------------- |
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−5V to (VBOOT + 5V) |
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LGATEx to GND |
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DC ------------------------------------------------------------------------------------------------------------------- |
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−0.3V to (VPVCC + 0.3V) |
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<20ns -------------------------------------------------------------------------------------------------------------- |
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−5V to (VPVCC + 5V) |
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Other Pins--------------------------------------------------------------------------------------------------------- |
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−0.3V to 6V |
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Power Dissipation, PD @ TA = 25°C |
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WQFN-24L 4x4 -------------------------------------------------------------------------------------------------- |
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3.57W |
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Package Thermal Resistance |
(Note 2) |
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WQFN-24L 4x4, θJA --------------------------------------------------------------------------------------------- |
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28°C/W |
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WQFN-24L 4x4, θJC -------------------------------------------------------------------------------------------- |
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7°C/W |
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Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------- |
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260°C |
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Junction Temperature ------------------------------------------------------------------------------------------- |
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150°C |
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Storage Temperature Range ---------------------------------------------------------------------------------- |
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−65°C to 150°C |
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ESD Susceptibility (Note 3) |
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HBM (Human Body Model) ------------------------------------------------------------------------------------ |
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2kV |
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Recommended Operating Conditions |
(Note 4) |
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Supply Input Voltage, VIN -------------------------------------------------------------------------------------- |
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7V to 20V |
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Control Voltage, VPVCC ----------------------------------------------------------------------------------------- |
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4.5V to 13.2V |
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Junction Temperature Range ---------------------------------------------------------------------------------- |
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−40°C to 125°C |
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Ambient Temperature Range ---------------------------------------------------------------------------------- |
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−40°C to 85°C |
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Electrical Characteristics |
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(TA = 25°C unless otherwise specified) |
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Parameter |
Symbol |
Test Conditions |
Min |
Typ |
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Max |
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Unit |
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PWM Controller |
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PVCC Supply Voltage |
VPVCC |
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4.5 |
-- |
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13.2 |
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V |
PVCC Supply Current |
ISUPPLY |
EN = 3.3V, Not Switching |
-- |
2 |
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4 |
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mA |
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PVCC Shutdown Current |
ISHDN |
EN = 0V, VCC Remains Active |
-- |
-- |
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220 |
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A |
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VCC POR Threshold |
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3.7 |
4 |
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4.3 |
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V |
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POR Hysteresis |
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-- |
0.3 |
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-- |
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V |
VCC (LDO Output) |
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PVCC > 10.8V; IVCC < 220mA |
4.75 |
5 |
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5.25 |
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V |
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Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
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www.richtek.com |
DS8811A-02 March 2014 |
6 |
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RT8811A
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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VCC Output Current |
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VCC = 4.5V |
220 |
-- |
400 |
mA |
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Switching Frequency |
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RTON = 500k (Note 5) |
270 |
300 |
330 |
kHz |
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Minimum TON |
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TON(MIN) |
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-- |
70 |
-- |
ns |
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Minimum Off-Time |
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TOFF(MIN) |
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-- |
300 |
-- |
ns |
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Zero Current Crossing |
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8 |
-- |
8 |
mV |
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Threshold |
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EN Threshold |
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EN Input Voltage |
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Logic-High |
VENH |
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1.6 |
-- |
-- |
V |
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Logic-Low |
VENL |
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-- |
-- |
0.8 |
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Mode Decision |
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PSI High Threshold |
VPSIH |
Enable Two Phases with FCCM |
2.4 |
-- |
-- |
V |
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PSI Low Threshold |
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VPSIL |
Enable One Phase with DEM |
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-- |
0.8 |
V |
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VID Input Voltage |
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Logic-High |
VVIDH |
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2 |
-- |
-- |
V |
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Logic-Low |
VVIDL |
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-- |
-- |
1 |
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Protection Function |
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Current Limit Setting Current |
IOCSET |
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9 |
10 |
11 |
A |
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Current Limit Setting Current |
IOCSET_TC |
On the basis of 25 C |
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6300 |
-- |
ppm/ C |
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Temperature Coefficient |
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Current Limit Threshold |
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20 |
-- |
20 |
mV |
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Current Limit Threshold |
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50 |
-- |
300 |
mV |
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Setting Range |
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Absolute Over-Voltage |
VOVP, Absolute |
VREFIN 1.33V |
1.9 |
2 |
2.1 |
V |
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Protection Threshold |
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Relative Over-Voltage |
VOVP, Relative |
VREFIN > 1.33V |
145 |
150 |
155 |
% |
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Protection Threshold |
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|
|
|
|
|
|
||||
OVP Delay |
|
tD_OVP |
|
-- |
5 |
-- |
s |
||
Relative Under-Voltage |
VUVP |
UVP |
35 |
40 |
45 |
% |
|||
Protection Threshold |
|||||||||
UVP Delay |
|
tD_UVP |
|
-- |
3 |
-- |
s |
||
Internal Die Temperature |
|
|
-- |
95 |
-- |
C |
|||
Sense Threshold |
|
|
|
||||||
|
|
|
|
|
|
|
|||
Thermal Shutdown Threshold |
TSD |
|
-- |
140 |
-- |
C |
|||
TSNS Threshold |
|
VTSEN |
(No Shutting Down) |
0.98 |
1 |
1.02 |
V |
||
PGOOD Blanking Time |
|
From EN = High to PGOOD = High with |
-- |
3.7 |
-- |
ms |
|||
|
VOUT within Regulation Point |
||||||||
|
|
|
|
|
|
|
|
||
VOUT Internal Soft-Start Time |
TSS |
From First UGATE to VOUT Regulation |
-- |
0.7 |
-- |
ms |
|||
Point, VREFIN = 1V and VOUT Initial = 0V |
|||||||||
|
|
|
|
|
|
|
|
||
Soft-Start Current Source |
ISS |
|
-- |
5 |
-- |
A |
|||
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8811A-02 March 2014 |
www.richtek.com |
|
7 |
RT8811A
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
|
|
|
|
|
|
|
Error Amplifier |
|
|
|
|
|
|
VSNS Error Comparator |
|
VREFIN = 1V |
5 |
-- |
5 |
mV |
Threshold (Valley) |
|
|||||
Reference |
|
|
|
|
|
|
|
|
|
|
|
|
|
Reference Voltage |
VVREF |
Sourcing Current = 1mA, VID No |
1.98 |
2 |
2.02 |
V |
Switching |
||||||
Driver On-Resistance |
|
|
|
|
|
|
|
|
|
|
|
|
|
UGATE Driver Source |
RUGATEsr |
IUGATEx = 150mA |
-- |
1.5 |
3 |
|
UGATE Driver Sink |
RUGATEsk |
VUGATEx VPHASEx = 0.1V |
-- |
2 |
4 |
|
LGATE Driver Source |
RLGATEsr |
ILGATEx = 150mA |
-- |
1.5 |
3 |
|
LGATE Driver Sink |
RLGATEsk |
VLGATEx = 0.1V |
-- |
0.7 |
1.4 |
|
Dead-Time |
|
From LGATE falling to UGATE rising |
-- |
30 |
-- |
ns |
|
|
|
|
|
||
|
From UGATE falling to LGATE rising |
-- |
30 |
-- |
||
|
|
|
||||
|
|
|
|
|
|
|
Boost Switch Ron |
RBOOT |
PVCC to BOOTx, IBOOT = 10mA |
-- |
40 |
80 |
|
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. Not production tested. Test condition is VIN = 8V, VOUT = 1V, IOUT = 20A using application circuit.
Copyright ©2014 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8811A-02 March 2014 |
8 |
|
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