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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.
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 requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
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
Marking Information
RT2872 GSPYMDNN
RT2872GSP : Product Number YMDNN : Date Code
Simplified Application Circuit
VIN CIN
RT
VIN
BOOT
RT2872 SW
RT
FB
CB L R1
VOUT
COUT
GND
COMP
CC RC
R2
Copyright ©2023 Richtek Technology Corporation. All rights reserved. DS2872-07 February 2023
is a registered trademark of Richtek Technology Corporation.
www.richtek.com 1
RT2872
Pin Configurations
(TOP VIEW)
SW BOOT
EN GND
8
2
7
GND
3
6
9
4
5
VIN RT COMP FB
SOP-8 (Exposed Pad)
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
SW
Switch Node. Connect to external L-C filter.
2
BOOT
Bootstrap Supply for the High-Side MOSFET. Connect a 100nF or greater capacitor between the BOOT and SW pins.
3
EN
Enable Control Input. A logic-high enables the converter; a logic-low forces the device into shutdown mode.
4, 9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation.
5
FB
Feedback Voltage Input. This pin is used to set the.