®
RT2825
4.5V to 18V, 5A/5A Dual Synchronous Step-Down Converter
General Description
The RT2825 features two synchronous wide input range
high efficiency buck converters that cab deliver up to 5A/
5A output current from a 4.5V to 18V input supply. The
converters are designed to simplify its application while
giving the designer the option to optimize their usage
according to the target application.
The converters can operate in 5V, 9V, 12V or 15V systems
and have integrated power transistors. The RT2825's
current mode architecture allows the transient response
to be improved. Cycle-by-cycle current limit provides
protection against shorted outputs.
Each converter features enable pin that allows a delayed
start-up for sequencing purposes, soft start pin that allows
adjustable soft-start time by choosing the soft-start
capacitor, and a current limit (RLIMx) pin that enables
designer
to adjust current limit by selecting an external
resistor and optimize the choice of inductor. The COMP
pin allows optimizing transient versus dc accuracy
response with a simple RC compensation.
The switching frequency of the converters can either be
set with an external resistor connected to ROSC pin or
can be synchronized to an external clock if needed. The
switching regulators are designed to operate from
200kHz to 1MHz. The converters operate with 180° phase
between two channels to minimize the input filter
requirements.
The RT2825 also features a low power mode enabled by
an external signal, which allows for a reduction on the
input power supplied to the system
when the host
processor is in stand-by (low activity) mode.
The RT2825 is available in a VQFN-36L 6x6 package.
Note :
***Empty means Pin1 orientation is Quadrant 1
Richtek products are :
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Features
Wide Input Supply Voltage Range : 4.5V to 18V
Fully Integrated Dual-Buck, Up to 5A/5A
Adjustable Switching Frequency 200kHz to 1MHz
Set by External Resistor or SYNC Signal
Dedicated Enable/Soft-Start for Each Buck
Current Mode Control with Simple Compensation
Circuit
Adjustable Cycle-by-Cycle Current Limit Set by
External Resistor
Over-Temperature Protection
Power Good Indicator
Discontinuous Operating Mode at Light Load when
LOWP = L
1% V
REF
Accuracy
RoHS Compliant and Halogen Free
Applications
DTV
TCON
BDVD
Set Top Boxes
Tablet
Ordering Information
RT2825
Pin 1 Orientation
***
(2) : Quadrant 2, Follow EIA-481-D
Package Type
QV : VQFN-36L 6x6 (V-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
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Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2825-00 May 2017
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
