RT8234A
Single Synchronous Buck PWM Controller with LDO Regulator
General Description
Features
z PWM Controller
The RT8234A is a cost effective synchronous buck
controller with an integrated 3Alinear regulator. The PWM
controller provides high efficiency, excellent transient
response, and highDC output accuracy needed for stepping
down high voltage batteries to generate low voltage
supplies in notebook computers.
` Wide Input Voltage Range : 4.5V to 26V
` Adjustable Output Voltage Range : 0. 75V to 3.3V
` Resistor Programmable Current Limit
` Quick Load Step Response within 100ns
` 1% VOUT Accuracy Over Line and Load
` Resistor Programmable Frequency
` Over/Under Voltage Protection
The constant on-time PWM control scheme handles wide
input/output voltage ratios with ease and provides
“instant-on” response to load transients while maintaining
a relatively constant switching frequency. The Ultra Sonic
Mode (USM) setting maintains the switching frequency
above 30kHz, which eliminates noise in audio applications.
` Linear Current Limit Soft-Start
` Drives Large Synchronous Rectifier FETs
` Power Good Indicator
z LDO Regulator
` Output Current Up to 3A
The RT8234A is intended for CPU core, chipset, DRAM,
or other low voltage supplies as low as 0.75V at a reduced
cost without the need for a current sense resistor.
` 1% Accuracy Over Line and Load
` Adjustable Output Voltage Down to 0.75V
` Independent Enable and Power Good Indicator
z RoHS Compliant and 100% Halogen Free
The 3ALDO regulator maintains fast transient response,
only requiring a 20μF ceramic output capacitor. In addition,
the LDO supply input is provided by an external power
source to significantly reduce the total power loss. The
RT8234Ais available in a WQFN-16L 3x3 package.
Applications
z Notebook Computers
z CPU Core Supply
z Chipset/RAM Supply as Low as 0.75V
Ordering Information
RT8234A
Pin Configurations
Package Type
TOP VIEW
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
16 15 14 13
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
1
2
3
4
12
11
10
9
FB
PGOOD
LVIN
PHASE
BOOT
VDD
GND
17
Note :
LOUT
LGATE
5
6
7
8
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.
WQFN-16L 3x3
Marking Information
RT8234AGQW
RT8234AZQW
07=: Product Code
07 : Product Code
YMDNN : Date Code
YMDNN : Date Code
07=YM
07 YM
DNN
DNN
DS8234A-01 June 2011
www.richtek.com
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