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RS6511
3A, 20V, 400KHz DC/DC Asynchronous Step‐Down Converter
General Description
The RS6511 is a high‐efficiency asynchronous step‐down DC/DC converter that can deliver up to 3A output current from
4.75V to 20V input supply. The RS6511's current mode architecture and external compensation allow the transient
response to be optimized over a wide range of loads and output capacitors. Cycle‐by‐cycle current limit provides protection
against shorted outputs and thermal shutdown protection.
The RS6511 also provides output under voltage protection and thermal shutdown protection. The low current (<30μA)
shutdown mode provides output disconnection, enabling easy power management in battery‐powered systems.
Features
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3A Output Current
Up to 93% Efficiency
Integrated 100mΩ Power MOSFET Switches
Fixed 400KHz Frequency
Cycle‐by‐Cycle Over Current Protection
Thermal Shutdown function
Wide 4.75V to 20V Operating Input Range
Output Adjustable from 1.23V to 18V
Programmable Under Voltage Lockout
Available in an SOP‐8 with Exposed Pad Package
RoHS Compliant and 100% Lead (Pb)‐Free and Green
(Halogen Free with Commercial Standard)
Applications
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PC Motherboard, Graphic Card
LCD Monitor
Set‐Top Boxes
DVD‐Video Player
Telecom Equipment
ADSL Modem
Printer and other Peripheral Equipment
Microprocessor core supply
Networking power supply
Pre‐Regulator for Linear Regulators
Green Electronics/Appliances
Application Circuits
C5
1
INPUT
4.75V to 21V
C1
10uF/35V
CERAMIC x2
OFF ON
BS
2
7
8
4
U1
IN
EN
NC
GND
10nF
SW
FB
COMP
3
5
6
C6
R3
5.6KΩ
(Optional)
C3
8.2nF
R2
10KΩ 1%
D1
B340A
R1
16.9KΩ 1%
C2
22uF/6.3V
CERAMIC x2
L1
15uH
OUTPUT
3.3V/3A
RS6511‐ADSE
This integrated circuit can be damaged by ESD. Orister Corporation recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DS‐RS6511‐07
February, 2010
www.Orister.com