RT8078A Datasheet, PDF (1/12 Pages) Richtek Technology Corporation – 4A, 1MHz, Synchronous Step-Down Converter

RT8078A
4A, 1MHz, Synchronous Step-Down Converter
General Description
The RT8078A is a high efficiency synchronous, step-down
DC/DC converter. It's input voltage range from 2.7V to 5.5V
that provides an adjustable regulated output voltage from
0.6V to V_IN 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 switching frequency is
fixed internally at 1MHz. The 100% duty cycle provides
low dropout operation, hence extending battery life in
portable systems. Current mode operation with internal
compensation allows the transient response to be
optimized over a wide range of loads and output capacitors.
The RT8078A is operated in PWM mode to achieve high
efficiency for a wide load range. The RT8078A is available
in WDFN-10L 3x3 and SOP-8 (Exposed Pad) packages.
Ordering Information
RT8078A
Package Type
QW : WDFN-10L 3x3 (W-Type)
SP : SOP-8 (Exposed Pad-Option 2)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
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 Fixed Frequency : 1MHz
z No Schottky Diode Required
z Internal Compensation
z 0.6V Reference Allows Low Output Voltage
z PWM Mode Operation
z Low Dropout Operation : 100% Duty Cycle
z OCP, UVP, OVP, OTP
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)
LX 1
LX 2
LX ³
PGOOD 4
EN 5
10 PVIN
9 PVIN
8 SVIN
7 NC
11 6 FB
WDFN-10L 3x3
LX
LX
PGOOD
EN
8
2
7
GND
3
96
4
5
PVIN
PVIN
SVIN
FB
SOP-8 (Exposed Pad)
DS8078A-01 June 2011
www.richtek.com
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