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RT8228BGQW

Description
DC/DC Cntrlr Single-OUT Step Down 12-Pin WQFN EP
File Size236KB,15 Pages
ManufacturerRichtek Technology Corporation
Websitehttps://www.richtek.com/
Environmental Compliance
Download Datasheet Parametric Compare View All

RT8228BGQW Overview

DC/DC Cntrlr Single-OUT Step Down 12-Pin WQFN EP

RT8228BGQW Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
Number of Outputs1
TopologyStep Down
Output Voltage (V)0.5 to 3.3
Minimum Input Voltage (V)4.5
Maximum Input Voltage (V)26
Operating Supply Voltage (V)4.5 to 5.5
Typical Quiescent Current (mA)0.5
Maximum Power Dissipation (mW)606
Control MethodPWM
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier PackageWQFN EP
Pin Count12
Standard Package NameQFN
MountingSurface Mount
Package Height0.75(Max)
Package Length2.1(Max)
Package Width2.1(Max)
PCB changed12
Lead ShapeNo Lead
RT8228B
Single Synchronous Buck PWM Controller
General Description
The RT8228B PWM controller provides high efficiency,
excellent transient response, and high DC output accuracy
needed for stepping down high voltage batteries to
generate low voltage CPU core, I/O, and chipset RAM
supplies in notebook computers.
The constant on-time PWM control scheme handles wide
input/output voltage ratios with ease and provides 100ns
“instant-on”
response to load transients while maintaining
a relatively constant switching frequency.
The RT8228B achieves high efficiency at a reduced cost
by eliminating the current sense resistor found in
traditional current mode PWMs. Efficiency is further
enhanced by its ability to drive very large synchronous
rectifier MOSFETs and enter diode emulation mode at
light load condition. The buck conversion allows this device
to directly step down high voltage batteries at the highest
possible efficiency. The RT8228B is intended for CPU core,
chipset, DRAM, or other low voltage supplies as low as
0.5V. The RT8228B is available in a WQFN-12L 2x2
package.
Features
Built in 1% 0.5V Reference Voltage
Adjustable 0.5V to 3.3V Output Range
Support Pure MLCC Output Capacitor
Quick Load Step Response within 100ns
4700ppm/°C Programmable Current Limit by Low
°
Side R
DS(ON)
Sensing
4.5V to 26V Battery Input Range
Resistor Programmable Frequency
Internal Ramp Current Limit Soft-Start Control
Drives Large Synchronous Rectifier FETs
Integrated Boost Switch
Over/Under Voltage Protection
Thermal Shutdown
Power Good Indicator
RoHS Compliant and Halogen Free
Applications
Notebook Computers
CPU Core Supply
Chipset/RAM Supply as Low as 0.5V
Generic DC/DC Power Regulator
Ordering Information
RT8228B
Package Type
QW : WQFN-12L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
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)
GND
12
TON
11
LGATE
PHASE
UGATE
CS
10
9
1
2
3
4
5
PGOOD
EN
MODE
GND
13
6
8
7
BOOT
WQFN-12L 2x2
RT8228B-05 October 2011
VCC
FB
www.richtek.com
1

RT8228BGQW Related Products

RT8228BGQW RT8228BGQW(Z00)
Description DC/DC Cntrlr Single-OUT Step Down 12-Pin WQFN EP DC/DC Cntrlr Single-OUT Step Down 12-Pin WQFN EP
EU restricts the use of certain hazardous substances Compliant Compliant
ECCN (US) EAR99 EAR99
Part Status Active Active
Number of Outputs 1 1
Topology Step Down Step Down
Output Voltage (V) 0.5 to 3.3 0.5 to 3.3
Minimum Input Voltage (V) 4.5 4.5
Maximum Input Voltage (V) 26 26
Operating Supply Voltage (V) 4.5 to 5.5 4.5 to 5.5
Typical Quiescent Current (mA) 0.5 0.5
Maximum Power Dissipation (mW) 606 606
Control Method PWM PWM
Minimum Operating Temperature (°C) -40 -40
Maximum Operating Temperature (°C) 85 85
Supplier Package WQFN EP WQFN EP
Pin Count 12 12
Standard Package Name QFN QFN
Mounting Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max)
Package Length 2.1(Max) 2.1(Max)
Package Width 2.1(Max) 2.1(Max)
PCB changed 12 12
Lead Shape No Lead No Lead
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