DESCRIPTION FEATURES APPLICATIONS BLOCK DIAGRAM

RS6513A
3A, Asynchronous PWM Control DC/DC
Step-Down Regulator
DESCRIPTION
RS6513A provides low-ripple power, high efficiency,
and excellent transient characteristics. The PWM
control circuit is able to vary the duty ratio linearly from
0 up to 100%. This converter also contains an error
amplifier circuit as well as a soft-start circuit that
prevents overshoot at startup. An enable function, an
over current protect function and a short circuit protect
function are built inside, and when OCP or SCP
happens, the operation frequency will be reduced from
350KHz to 30KHz. Also, an internal compensation
block is built in to minimum external component count.
With the addition of an internal P-channel Power MOS,
a coil, capacitors, and a diode connected externally,
these ICs can function as step-down switching
regulators. They serve as ideal power supply units for
portable devices when coupled with the SOP-8
mini-package, providing such outstanding features as
low current consumption. Since this converter can
accommodate an input voltage up to 20V, it is also
suitable for the operation via an AC adapter.
FEATURES
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Input voltage: 3.6V to 20V
Output voltage: 0.8V to VCC
Duty ratio: 0% to 100% PWM control
Oscillation frequency: 350KHz typical
Soft-start, Current limit, Enable function
Thermal Shutdown function
Built-in internal SW P-channel MOS
SOP-8 package
RoHS Compliant and 100% Lead (Pb)-Free and
Green (Halogen Free with Commercial Standard)
APPLICATIONS
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PC Motherboard
LCD Monitor
Graphic Card
DVD-Video Player
Telecom Equipment
ADSL Modem
Printer and other Peripheral Equipment
Microprocessor core supply
Networking power supply
BLOCK DIAGRAM
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan
RS6513A
APPLICATION CIRCUIT
Note: VOUT = VFB x (1+RA/RB)
RB=0.7K~5K ohm
VIN=12V, IMAX = 3A
VOUT
L1 Value
2.5V
22μH
3.3V
27μH
5V
33μH
ORDER INFORMATION
Device
RS6513A-XX Y Z
V1.0
Device Code
XX is nominal output voltage designator :
“Blank” =ADJ
Y is package designator:
S: SOP-8
Z is Lead Free designator:
P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package
G: Green (Halogen Free with Commercial Standard)
2
December 2013
RS6513A
PIN ASSIGNMENTS
SOP-8
PIN DESCRIPTION
Pin Name
FB
EN
OCSET
VCC
OUTPUT
VSS
V1.0
Description
Feedback Pin
POWER OFF Pin:
H: Normal operation (Step-down operation)
L: Step-down operation stopped (All circuits deactivated)
Add an external resistor to set max output current
Power Supply Pin
Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce
EMI
Ground Pin
3
Pin No.
1
2
3
4
5, 6
7, 8
December 2013
RS6513A
IMPORTANT NOTICE
Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements,
improvements, and other changes to its products and to discontinue any product without notice at any time.
PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No
circuit patent licenses are implied.
Princeton Technology Corp.
2F, 233-1, Baociao Road,
Sindian Dist, New Taipei 23145, Taiwan
Tel: 886-2-66296288
Fax: 886-2-29174598
http://www.princeton.com.tw
V1.0
9
December 2013