Step-Down Converter. RT2872 Datasheet


RT2872 Converter. Datasheet pdf. Equivalent


Part Number

RT2872

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 15 Pages
Datasheet
Download RT2872 Datasheet


RT2872
Reference
Design
Sample &
Design
Tools
Buy
®
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 105mhigh-side
and 80mlow-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 require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features
z 4.5V to 36V Input Voltage Range
z 3A Output Current
z Internal N-MOSFETs
z Current Mode Control
z Frequency Operation : 300kHz to 1MHz
z Adjustable Output Voltage from 0.8V to 30V
z High Efficiency Up to 95%
z Stable with Low ESR Ceramic Output Capacitors
z Cycle-by-Cycle Current Limit
z Input Under-Voltage Lockout
z Output Under-Voltage Protection
z Thermal Shutdown
z AEC-Q100 Grade 3 Certification
z RoHS Compliant and Halogen Free
Applications
z Point of Load Regulator in Distributed Power Systems
z Digital Set Top Boxes
z Broadband Communications
z Vehicle Electronics
z Automotive Audio, Navigation, and Information Systems
z Enterprise Datacom Platforms Point of Load (POL)
z 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 ©2018 Richtek Technology Corporation. All rights reserved.
DS2872-06 January 2018
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT2872
RT2872
Pin Configurations
(TOP VIEW)
SW
BOOT
EN
GND
8
27
GND
36
9
45
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 output voltage of the
converter to regulate to the desired value via an resistive divider.
Compensation Node. COMP is used to compensate the regulation control loop.
6
COMP
Connect a R-C network from the COMP to GND. In some cases, an additional
capacitor from COMP to GND is required.
7 RT
Switching Frequency Setting. Connect an external resistor to set the switching
frequency from 300kHz to 1MHz.
8
VIN
Power Input. The input voltage range is from 4.5V to 36V. Must bypass with a
suitable large ceramic capacitor at this pin.
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2872-06 January 2018


Features Reference Design Sample & Design Too ls Buy ® RT2872 3A, 36V, Synchrono us Step-Down Converter General Descrip tion The RT2872 is a high efficiency, c urrent-mode synchronous step-down DC/DC converter that can deliver up to 3A ou tput current over a wide input voltage range from 4.5V to 36V. The device inte grates 105mΩ high-side and 80mΩ low -side MOSFETs to achieve high conversio n efficiency. The current-mode control architecture supports fast transient re sponse and simple external compensation . A cycle-by-cycle current limit functi on provides protection against shorted output and an internal soft-start elimi nates input current surge during start- up. The RT2872 provides complete protec tion functions such as input under-volt age lockout, output under-voltage prote ction, over-current protection and ther mal shutdown. The RT2872 is available i n the thermal enhanced SOP-8 (Exposed P ad) package. Ordering Information RT287 2 Package Type SP: SOP-8 (Exposed Pad-Option 2) Lead Plating System .
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