RT8074 Datasheet, PDF (1/10 Pages) Richtek Technology Corporation – 4A, 2MHz, Synchronous Step-Down Converter

®
RT8074
4A, 2MHz, Synchronous Step-Down Converter
General Description
The RT8074 is a high efficiency synchronous, step-down
DC/DC converter. Its input voltage range is from 2.7V to
5.5V and provides an adjustable regulated output voltage
from 0.8V to 5V while delivering up to 4A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The default switching
frequency is set at 2MHz, if the RT pin is left open. It can
also be varied from 200kHz to 2MHz by adding an external
resistor. Current mode operation with external
compensation allows the transient response to be
optimized over a wide range of loads and output capacitors.
Ordering Information
RT8074
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
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 Adjustable Frequency : 200kHz to 2MHz
z No Schottky Diode Required
z 0.8V Reference Allows Low Output Voltage
z Low Dropout Operation : 100% Duty Cycle
z Enable Function
z Internal Soft-Start
z RoHS Compliant and Halogen Free
Applications
z LCD TV and Monitor
z Notebook Computers
z Distributed Power Systems
z IP Phones
z Digital Cameras
Pin Configurations
(TOP VIEW)
COMP
8 FB
GND 2
7 RT
GND
EN 3
96
LX
VIN 4
5 LX
SOP-8 (Exposed Pad)
Typical Application Circuit
V_IN
2.7V to 5.5V
C_IN
10µF
R_OSC
4
RT8074
VIN
LX
5, 6
L
1.5µH
3 _EN
7 _RT
FB ⁸
COMP ¹
R_COMP
10k
GND ^2,
9 (Exposed Pad)
R1
750
C_COMP
R2
2k
560pF
V_OUT
1.1V
C_OUT
22µF
Note : Using all Ceramic Capacitors
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8074-07 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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