DS6550A Datasheet, PDF (1/16 Pages) Richtek Technology Corporation – Synchronous DC-DC Step-Down Controller with 5V LDO

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RT6550A
Synchronous DC-DC Step-Down Controller with 5V LDO
General Description
The RT6550A is a step-down, controller generating supply
voltages for battery-powered systems. It includes Pulse-
Width Modulation (PWM) controller adjustable from 2V
to 5.5V, and a 5V linear regulator which provides up to
100mA output current. Other features include on-board
power-up sequencing, internal soft-start, and soft-
discharge output that prevents negative voltage during
shutdown.
A constant current ripple PWM control scheme operates
without sense resistors and provides 100ns response to
load transient. The RT6550A is available in the WDFN-
10L 3x3 package.
Ordering Information
RT6550A
Pin 1 Orientation***
(2) : Quadrant 2, Follow EIA-481-D
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
***Empty means Pin1 orientation is Quadrant 1
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.
Features
 Support Connected Shutdown Mode for Ultrabook
 CCRCOT Control with 100ns Load Step Response
 PWM Maximum Duty Ratio > 98%
 5V to 25V Input Voltage Range
 2V to 5.5V Output Voltage Range
 5V LDO with 100mA Output Current
 Internal Frequency Setting with 300kHz @ V_IN =12V
 Internal Soft-Start and Soft-Discharge
 4700ppm/°C R_DS(ON) Current Sensing
 Independent Switcher Enable Control
 Built-In OVP/UVP/OCP/OTP
 Non-Latch UVLO
Applications
 Notebook and Sub-Notebook Computers
 System Power Supplies
 3-Cell and 4-Cell Li+ Battery-Powered Devices
Pin Configuration
(TOP VIEW)
EN 1
CS 2
FB 3
VO_DIS ⁴
LDO5 5
10 _LGATE
9 _PHASE
8 UGATE
7 BOOT
11 6 VIN
WDFN-10L 3x3
Marking Information
6W= : Product Code
6W=YM
DNN
YMDNN : Date Code
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS6550A-00 September 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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