RT6551A/B
Features
Ordering Information
RT6551A/B
Package Type
QW : WQFN-20L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
VDDQ and VTT Discharge Control
A : Tracing Mode
B : Non-Tracking Mode
Note :
Richtek products are :
�½
PWM Controller
�½
Adjustable Current Limit with Low-Side R
DS(ON)
Sensing
�½
Low Quiescent Supply Current
�½
�½
Quick Load-Step Response within 100ns
1% V
VDDQ
Accuracy Over Line and Load
�½
Adjustable 0.675V to 3.3V Output Range for 1.8V
(DDR2), 1.5V (DDR3), 1.35V (DDR3L), 1.2V (LPDDR3)
and 1.2V (DDR4)
�½
4.5V to 26V Battery Input Range
�½
�½
�½
�½
�½
Resistor Adjustable Frequency
Over-/Under-Voltage Protection
Internal Voltage Ramp Soft-Start
Drives Large Synchronous Rectifier MOSFETs
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.
�½
Power Good Indicator
1.5A LDO (VTT), Buffered Reference (VTTREF)
Marking Information
RT6551AGQW
8N= : Product Code
YMDNN : Date Code
Capable to Sink and Source Up to 1.5A
�½
LDO Input Available to Optimize Power Losses
μ
�½
Requires Only 10μF Ceramic Output Capacitor
�½
Integrated Divider Tracks 1/2 VDDQ for both VTT
and VTTREF
�½
Accuracy
±
20mV for both VTTREF and VTT
�½
Supports High-Z in S3 and Soft-Off in S4/S5
RoHS Compliant and Halogen Free
�½
8N=YM
DNN
RT6551BGQW
8M= : Product Code
8M=YM
DNN
YMDNN : Date Code
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS6551A/B-00 May 2015
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
