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  Richtek Technology Electronic Components Datasheet  

RT8015A Datasheet

Synchronous Step-Down Converter

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RT8015A
3A, 2MHz, Synchronous Step-Down Converter
General Description
The RT8015A is a high efficiency synchronous, step-down
DC/DC converter. Its input voltage range is from 2.6V to
5.5V and provides an adjustable regulated output voltage
from 0.8V to 5V while delivering up to 3A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The switching frequency is
set by an external resistor or can be synchronized to an
external clock. The 100% duty cycle provides low dropout
operation extending battery life in portable systems.
Current mode operation with external compensation
allows the transient response to be optimized over a wide
range of loads and output capacitors.
The RT8015A is operated in forced continuous PWM Mode
which minimizes ripple voltage and reduces the noise and
RF interference.
The 100% duty cycle in Low Dropout Operation further
maximize battery life.
The RT8015A is available in the WDFN-10L 3x3 package.
Ordering Information
RT8015A
Package Type
QW : WDFN-10L 3x3
Note :
Lead Plating System
P : Pb Free
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 High Efficiency : Up to 95%
z Low RDS(ON) Internal Switches : 110mΩ
z Programmable Frequency : 300kHz to 2MHz
z No Schottky Diode Required
z 0.8V Reference Allows for Low Output Voltage
z Forced Continuous Mode Operation
z Low Dropout Operation : 100% Duty Cycle
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Portable Instruments
z Battery-Powered Equipment
z Notebook Computers
z Distributed Power Systems
z IP Phones
z Digital Cameras
Pin Configurations
(TOP VIEW)
SHDN/RT 1
GND 2
LX 3
LX 4
PGND 5
10 COMP
9 FB
8 VDD
7 PVDD
11 PVDD
WDFN-10L 3x3
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS8015A-04 March 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8015A Datasheet

Synchronous Step-Down Converter

No Preview Available !

RT8015A
Typical Application Circuit
VIN
5V
ROSC
332k
RT8015A
1 SHDN/RT
10
COMP
2 GND
3, 4
LX
FB 9
8
VDD
5 PGND
PVDD 6, 7
L1
2µH
RCOMP
30k
CIN
22µF
C1
22pF
CCOMP
1000pF
R2 240k
R1
510k
COUT
22µFx2
VOUT
2.5V/3A
Note : Using all Ceramic Capacitors
Functional Pin Description
Pin No.
1
2
3, 4
Pin Name
Pin Function
Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the
SHDN/RT
switching frequency. Forcing this pin to VDD causes the device to be shut down.
GND
Signal Ground. All small-signal components and compensation components should
connect to this ground, which in turn connects to PGND at one point.
LX Internal Power MOSFET Switches Output. Connect this pin to the inductor.
5 PGND
6, 7 PVDD
8 VDD
9 FB
10 COMP
11 (Exposed Pad) NC
Power Ground. Connect this pin close to the negative terminal of CIN and COUT.
Power Input Supply. Decouple this pin to PGND with a capacitor.
Signal Input Supply. Decouple this pin to GND with a capacitor. Normally VDD is
equal to PVDD.
Feedback Pin. This pin Receives the feedback voltage from a resistive divider
connected across the output.
Error Amplifier Compensation Point. The current comparator threshold increases
with this control voltage. Connect external compensation elements to this pin to
stabilize the control loop.
No Internal Connection. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
www.richtek.com
2
DS8015A-04 March 2011


Part Number RT8015A
Description Synchronous Step-Down Converter
Maker Richtek
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RT8015A Datasheet PDF






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