900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




  Richtek Technology Electronic Components Datasheet  

RT8015B Datasheet

Synchronous Step-Down Converter

No Preview Available !

RT8015B
3A, 2MHz, Synchronous Step-Down Converter
General Description
The RT8015B 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. 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 RT8015B 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 RT8015B is available in the WDFN-10L 3x3 package.
Ordering Information
RT8015B
Package Type
QW : WDFN-10L 3x3
Operating Temperature Range
G : Green (Halogen Free with Commer-
rcial Standard)
Note :
Richtek Green 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 Power Good Output Voltage Indicator
z RoHS Compliant and Halogen 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 PGOOD
7 VDD
11 PVDD
WDFN-10L 3x3
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
DS8015B-01 September 2009
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8015B Datasheet

Synchronous Step-Down Converter

No Preview Available !

RT8015B
Typical Application Circuit
VIN
5V
CIN
22uF
PGOOD
R4
100k
R3
1
C1
0.1uF
ROSC
332k
RT8015B
6 PVDD
LX 3, 4
L1
2.2uH
CF
22pF
7 VDD
FB 9
8 PGOOD
COMP 10
RCOMP
27k
CCOMP
1nF
1 SHDN/RT
GND 2
PGND 5
Note : Using all Ceramic Capacitors
R1
510k
R2
240k
VOUT
2.5V/3A
COUT
22uF x 2
Table 1. Recommended Component Selection
VOUT (V)
R1 (kΩ )
R2 (kΩ ) RCOMP (kΩ) CCOMP (nF)
3.3
750 240
30
1
2.5
510 240
27
1
1.8
300 240
22
1
1.5
210 240
18
1
1.2
120 240
15
1
1.0 60 240 13 1
L1 (μH)
2.2
2.2
2.2
2.2
1.0
1.0
COUT (μF)
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
Functional Pin Description
Pin No. Pin Name
Pin Function
1 SHDN/RT
2 GND
Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the
switching frequency. Forcing this pin to VDD causes the device to be shut down.
Signal Ground. All small-signal components and compensation components should
connect to this ground, which in turn connects to PGND at one point.
3, 4 LX
Internal Power MOSFET Switches Output. Connect this pin to the inductor.
5 PGND
6 PVDD
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.
7 VDD
8 PGOOD
9 FB
10 COMP
Signal Input Supply. Decouple this pin to GND with a capacitor. Normally VDD is equal
to PVDD.
Power Good Indicator. This pin is open-drain logic output that is pulled to ground
when the output voltage is not within ±12.5% of regulation point.
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
11 Exposed Pad
connected to GND for maximum power dissipation.
www.richtek.com
2
DS8015B-01 September 2009


Part Number RT8015B
Description Synchronous Step-Down Converter
Maker Richtek Technology
PDF Download

RT8015B Datasheet PDF






Similar Datasheet

1 RT8015 Synchronous Step-Down Regulator
Richtek Technology
2 RT8015A Synchronous Step-Down Converter
Richtek
3 RT8015B Synchronous Step-Down Converter
Richtek Technology





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy