®
RT2872
3A, 36V, Synchronous Step-Down Converter
General Description
The RT2872 is a high efficiency, current-mode
synchronous step-down DC/DC converter that can deliver
up to 3A output current over a wide input voltage range
from 4.5V to 36V. The device integrates 105mΩ high-side
and 80mΩ low-side MOSFETs to achieve high conversion
efficiency. The current-mode control architecture supports
fast transient response and simple external compensation.
A cycle-by-cycle current limit function provides protection
against shorted output and an internal soft-start eliminates
input current surge during start-up. The RT2872 provides
complete protection functions such as input under-voltage
lockout, output under-voltage protection, over-current
protection and thermal shutdown.
The RT2872 is available in the thermal enhanced SOP-8
(Exposed Pad) package.
Features
4.5V to 36V Input Voltage Range
3A Output Current
Internal N-MOSFETs
Current Mode Control
Frequency Operation : 300kHz to 1MHz
Adjustable Output Voltage from 0.8V to 30V
High Efficiency Up to 95%
Stable with Low ESR Ceramic Output Capacitors
Cycle-by-Cycle Current Limit
Input Under-Voltage Lockout
Output Under-Voltage Protection
Thermal Shutdown
AEC-Q100 Grade 3 Certification
RoHS Compliant and Halogen Free
Applications
Point of Load Regulator in Distributed Power Systems
Digital Set Top Boxes
Broadband Communications
Vehicle Electronics
Automotive Audio, Navigation, and Information Systems
Enterprise Datacom Platforms Point of Load (POL)
Industrial Grade General Purpose Point of Load
Ordering Information
RT2872
Package Type
SP: SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (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.
Marking Information
RT2872GSP : Product Number
RT2872
GSPYMDNN
YMDNN : Date Code
Simplified Application Circuit
V
IN
C
IN
VIN
BOOT
RT2872
SW
R1
RT
R
T
GND
COMP
FB
C
C
R
C
R2
C
OUT
C
B
L
V
OUT
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2872-06 January 2018
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
