LX3005 Datasheet, PDF (1/3 Pages) Microsemi Corporation – 2A STEP-DOWN CONVERTER

LX3005
TM
®
2A STEP-DOWN CONVERTER
PRODUCTION DATASHEET
DESCRIPTION
The LX3005 is a 420kHz fixed The LX3005 also features an enable
frequency PWM buck (step-down) DC-DC function, internal circuitry for soft start,
converter, capable of driving a 2A load and protection schemes such as thermal
with high efficiency, low ripple and shutdown, over-current protection, and
excellent line and load regulation. The short-circuit protection. When OCP or
device operates over a wide input voltage SCP is triggered, the device operating
range of 4.75V to 25V, and the output frequency will be reduced from typically
voltage can be externally set from 0.8V to 420kHz to typically 40kHz, limiting the
a voltage near VIN, as the PWM control output power capability.
circuit is able to adjust the duty ratio The LX3005 serves as an ideal power
linearly from 0% to close to 100%.
supply device for portable devices,
The LX3005 device integrates a especially for chipset power in portable
high-side low RDS_ON PMOS for a low systems. It’s widely used for PDVD, LCD
cost and high efficiency solution. An monitor and DPF chipset power sources.
internal transconductance error amplifier The LX3005 is available in SOIC8
is used in the control loop allowing package and is functional from an ambient
flexibility to compensate the system using temperature range of 0˚C to 85˚C.
an all ceramic capacitor system.
IMPORTANT: : For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Patents Pending
KEY FEATURES
 2A Constant Output Current
 130m RDSON Internal Power MOSFET
 Up to 94% Efficiency
 Fixed 420kHz Frequency
 Wide 4.75V to 25V Input Voltage Range
 Output Voltage Adjustable from 0.8V to
21V
 Built-in Thermal Shutdown Function
 Built-in Current Limit Function
 Built-in Soft-start Function
 Support Ceramic or Electrolytic
Capacitors
 Pb-free and RoHS Compliant
APPLICATIONS
 Portable DVD
 LCD Monitor/LCD TV
 Digital Photo Frame
 ADSL
 Set-Top Box
PRODUCT HIGHLIGHT
V_IN
ON OFF
VIN
EN
SW
LX3005
C_IN
COMP
FB
C_C
R_C
GND
L1
D1
C1
V_OUT @ 2A
R2
C_O
R1
PACKAGE ORDER INFO
T_A (C) ^DM
Plastic SOIC 8-pin
RoHS Compliant / Pb-free
0 to 85
LX3005CDM
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX3005CDM-TR)
THERMAL DATA
_JA = 100C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT
Junction Temperature Calculation: TJ = TA + (PD x JA).
The JA numbers are guidelines for the thermal performance of the
device/pc-board system. All of the above assume no ambient airflow.
Copyright  2010
Rev.1.0, 2010-02-05
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-8776458, 714-898-8121, Fax: [phone]
Page 1