RT8129B PWM Controller Datasheet

RT8129B Datasheet, PDF, Equivalent


Part Number

RT8129B

Description

High Efficiency Single Synchronous Buck PWM Controller

Manufacture

Richtek

Total Page 17 Pages
Datasheet
Download RT8129B Datasheet


RT8129B
RT8129B
High Efficiency Single Synchronous Buck PWM Controller
General Description
The RT8129B is a high efficiency single phase
synchronous buck controller with 5V/12V supply
voltage. The RT8129B integrates a Constant-On-Time
(COT) PWM controller and a MOSFET drivers with
internal bootstrap diodes, which is specifically designed
to improve converter efficiency at light load condition.
At light load condition, it automatically operates in the
diode emulation mode to reduce switching frequency
and improve conversion efficiency.
Other features include power good indication,
enable/disable control and internal soft-start function.
The RT8129B also provide protection functions
including Over-Voltage Protection (OVP), Under-Voltage
Protection (UVP), current limit and thermal shutdown.
This device uses lossless low-side MOSFET RDS(ON)
current sense technique for current limit with adjustable
threshold set by connecting a resistor between the
LGATE/OCSET and GND.
With above functions, the RT8129B provides
customers a cost-effective solution for high efficiency
power conversion. The RT8129B is available in the
WDFN-10L 3x3 package.
Features
Wide Input Voltage Range : 2.5V to 25V
High Light Load Efficiency
Integrated High Driving Capability N-MOSFET
Gate
Drivers and Embedded Switching Boot Diode
Single IC Supply Voltage : 4.5V to 13.2V
Power-Good Indicator
Enable/Disable Control
Internal Soft-Start
Programmable Current Limit Threshold
Under-Voltage Protection
Over-Voltage Protection
Thermal Shutdown
Applications
Motherboard, Memory/Chip-set Power
Graphic Card, GPU/Memory Core Power
Low Voltage, High Current DC-DC Regulator
Marking Information
Q0=YM
DNN
Q0= : Product Code
YMDNN : Date Code
Simplified Application Circuit
VCC
VPGOOD
Enable
RT8129B
VCC
BOOT
UGATE
PHASE
PGOOD LGATE/
OCSET
EN
FB
GND
VIN
VOUT
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
DS8129B-00 June 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8129B
RT8129B
Ordering Information
RT8129B
Package Type
QW : WDFN-10L 3x3 (W-Type)
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 Configuration
(TOP VIEW)
BOOT 1
PHASE 2
UGATE 3
LGATE/OCSET 4
GND 5
10 PGOOD
9 NC
8 FB
7 EN
11 6 VCC
WDFN-10L 3x3
Functional Pin Description
Pin No.
Pin Name
Pin Function
Bootstrap supply for high-side gate driver. Connect this pin to a power
1
BOOT
source VCC through a bootstrap diode, and connect a 0.1F or greater
ceramic capacitor from this pin to the PHASE pin to supply the power for
high-side gate driver.
Switch node. Connect this pin to the switching node of Buck converter.
Connect this pin to the Source of high-side MOSFET together with the Drain
2
PHASE
of low-side MOSFET and the inductor. The PHASE voltage is sensed for
zero current detection and over-current protection when low-side MOSFET
is on.
High-side MOSFET gate driver output. This pin provides the gate drive for
3
UGATE
the converter's high-side MOSFET. Connect this pin to the Gate of high-side
MOSFET.
Low-side MOSFET gate driver output. Connect this pin to the Gate of
4
LGATE/OCSET
low-side MOSFET. This pin is also used for current limit threshold setting.
Connect a resistor (ROCSET) from this pin to the GND pin to set the current
limit threshold.
5,
11 (Exposed Pad)
GND
Ground. The Exposed Pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
6 VCC
Supply voltage input. It is recommended to connect a 4.7F ceramic
capacitor from this pin to the GND pin. VCC also powers the low-side gate
driver.
7 EN
Enable control input. Drive EN higher than 2V to turn on the controller, lower
than 0.8V to turn it off. If the EN pin is open, it will be pulled to high by
internal circuit.
8 FB
This pin is used for output voltage feedback input and it is also monitored for
power good indication, over-voltage and under-voltage protections.
Connect this pin to the converter output through voltage divider resistors for
output voltage regulation.
9 NC
No internal connection.
Power good indication output. This pin provides an open drain output.
10
PGOOD
Connect this pin to a voltage source through a pull up resistor. The PGOOD
voltage goes high to indicate the output voltage is in regulation. This pin can
be left open if the power good indication function is not used.
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8129B-00 June 2019


Features RT8129B High Efficiency Single Synchron ous Buck PWM Controller General Descri ption The RT8129B is a high efficiency single phase synchronous buck controlle r with 5V/12V supply voltage. The RT812 9B integrates a Constant-On-Time (COT) PWM controller and a MOSFET drivers wit h internal bootstrap diodes, which is s pecifically designed to improve convert er efficiency at light load condition. At light load condition, it automatical ly operates in the diode emulation mode to reduce switching frequency and impr ove conversion efficiency. Other featur es include power good indication, enabl e/disable control and internal soft-sta rt function. The RT8129B also provide p rotection functions including Over-Volt age Protection (OVP), Under-Voltage Pro tection (UVP), current limit and therma l shutdown. This device uses lossless l ow-side MOSFET RDS(ON) current sense te chnique for current limit with adjustab le threshold set by connecting a resist or between the LGATE/OCSET and GND. With above functions, the R.
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