Step-Down Converter. RT2862A Datasheet


RT2862A Converter. Datasheet pdf. Equivalent


Part Number

RT2862A

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 15 Pages
Datasheet
Download RT2862A Datasheet


RT2862A
Design
Sample &
Tools
Buy
®
RT2862A
3A, 36V, Synchronous Step-Down Converter
General Description
The RT2862A 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 RT2862A provides
complete protection functions such as input under-voltage
lockout, output under-voltage protection, over-current
protection and thermal shutdown.
The RT2862A is available in the thermal enhanced SOP-8
(Exposed Pad) package.
Ordering Information
RT2862A
Package Type
SP: SOP-8 (Exposed Pad-Option 2)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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 Power Saving at Light Load
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
RT2862A
GSPYMDNN
RT2862AGSP : Product Number
YMDNN : Date Code
Simplified Application Circuit
VIN
CIN
RT
VIN BOOT
RT2862A
SW
RT FB
CB L
R1
VOUT
COUT
GND
COMP
CC RC
R2
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
DS2862A-02 January 2018
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT2862A
RT2862A
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.
DS2862A-02 January 2018


Features Design Sample & Tools Buy ® RT2862 A 3A, 36V, Synchronous Step-Down Conve rter General Description The RT2862A i s a high efficiency, current-mode synch ronous step-down DC/DC converter that c an deliver up to 3A output current over a wide input voltage range from 4.5V t o 36V. The device integrates 105mΩ hi gh-side and 80mΩ low-side MOSFETs to achieve high conversion efficiency. The current-mode control architecture supp orts fast transient response and simple external compensation. A cycle-by-cycl e current limit function provides prote ction against shorted output and an int ernal soft-start eliminates input curre nt surge during start-up. The RT2862A p rovides complete protection functions s uch as input under-voltage lockout, out put under-voltage protection, over-curr ent protection and thermal shutdown. Th e RT2862A is available in the thermal e nhanced SOP-8 (Exposed Pad) package. O rdering Information RT2862A Package Ty pe SP: SOP-8 (Exposed Pad-Option 2) Note : Lead Plating System G :.
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