RT8056 Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – Dual 1A 1.5MHz Synchronous Step-Down Converters

RT8056
Dual 1A 1.5MHz Synchronous Step-Down Converters
General Description
The RT8056 is a high efficiency synchronous dual step-
down converter. Capable of delivering two independent 1A
output current over a wide input voltage range from 2.8V
to 5.5V. The RT8056 is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
battery or from other power sources such as cellular
phones, PDAs and hand-held devices. The RT8056
provides two operation modes including PWM/Low-
Dropout auto switch and shutdown modes. The internal
synchronous rectifier with low R_DS(ON) dramatically reduces
conduction loss at PWM mode. No external Schottky
diode is required in practical applications. The RT8056
enters Low-Dropout mode when normal PWM cannot
provide regulated output voltage by continuously turning
on the upper P-MOSFET. The RT8056 enters shut-down
mode and consumes less than 0.1μA when EN pin is
pulled low. The switching ripple is easily smoothed-out
by small package filtering elements due to a fixed
operating frequency of 1.5MHz.
Ordering Information
RT8056
Package Type
QW : WDFN-10L 3x3 (W-Type)
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 2.8V to 5.5V Input Voltage Range
z 1.5MHz Fixed Frequency PWM Operation
z 2 x 1A Output Current
z Up to 95% Efficiency
z No Schottky Diode Required
z 0.6V Reference Allows for Low Output Voltage
z Low Dropout Operation : 100% Duty Cycle
z Small 10-Lead WDFN Package
z RoHS Compliant and Halogen Free
Applications
z Portable Instruments
z Microprocessors and DSP Core Supplies
z Cellular Phones
z Wireless and DSL Modems
z PC Cards
z Set Top Box
Pin Configurations
(TOP VIEW)
FB2 1
NC 2
VIN 3
NC ⁴
FB1 ⁵
10 _LX2
9 _EN2
8 GND
7 EN1
11 6 LX1
WDFN-10L 3x3
Marking Information
JM=YM
DNN
JM= : Product Code
YMDNN : Date Code
DS8056-02 April 2011
www.richtek.com
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