LX13088 Datasheet, PDF (1/12 Pages) Microsemi Corporation – Dual 1A Step-Down Converters

LX13088
TM
®
Dual 1A Step-Down Converters
PRODUCTION DATASHEET
DESCRIPTION
The LX13088 is a highly integrated synchronized to an external clock. With
dual output voltage regulator ideal for the E/S input held low, the LX13088
low power applications that require draws less than 10uA.
minimal board space. The two current Both converters have controlled soft
mode buck converters include integrated start, in addition to power up sequencing.
high side control switches, synchronous In the start-up sequence, the output of
rectifiers, and internal compensation. converter 1 is designed to precede the
The outputs of each converter are both output of converter 2.
rated for up to 1A, and the output Power On Reset function is provided
voltages are adjustable using external by means of an open-drain output at the
resistive dividers.
POR pin. The Power On Reset function
The LX13088 step down converters monitors the voltages at the VMON, FB1
operate at 1.3MHz fixed switching and FB2 pins, and pulls low if any of
frequency under normal load, reducing these voltages drop below the stated POR
external output filter component values threshold. The POR is internally
and size. Under light load conditions, the deglitched and provides a delayed
converters operate in a pulse-skipping recovery and reset time.
mode for improved efficiency.
The LX13088 provides peak over
The LX13088 incorporates out of current protection, short circuit protection
phase switching, where converter 2 and thermal shutdown. Discharge-Before-
switches 180° out of phase from Turn-On discharges the outputs
converter 1 in order to minimize the input completely before soft starting to always
ripple effects. The controller also bring them up in the proper sequence at
features an E/S pin that provides an start up or after a POR event.
enable input function, or allows the
converter to be
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
• Outputs can be set from 1V to
3.6V @ 1A
• No Rectifier Diode required
• 1.3MHz Switching
• 180° Phase Shifted Switching
• Optional External Clocking (2x
clock required)
• Light load Pulse Skipping
• Enable/Sleep state
• Internal Soft Start
• Open-drain Power On Reset
Monitors Input and Outputs
• Discharge Before-Turn-On
• Peak Over-Current Protection
• Short Circuit Protection
• Over Temperature Shutdown
APPLICATIONS
• Hard Disk Drives
• Set- Top Boxes
Product Highlight
PACKAGE ORDER INFO
T_A (°C)
LD ^{Plastic 3x3 mm DFN 10-pin}
RoHS Compliant / Pb-free
0 to +70
LX13088CLD
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX13088CLD-TR)
THERMAL DATA
θ_JA = 33 °C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT
Junction Temperature Calculation: T_J = T_A + (P_D x θ_JA).
The θ_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. 1.1, 2010-06-08
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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