Semtech Dual-Output Buck Controller Delivers Flexible Start-up/Shutdown Tracking
12 Junio 2007 - 7:00AM
Business Wire
Semtech Corp. (Nasdaq:SMTC), a leading supplier of analog and
mixed-signal semiconductors, today announced the SC416, a
dual-output, synchronous step-down controller with comprehensive
features to track start-up and shutdown voltages in notebook
computers, portable devices, tablet PCs, and embedded applications.
The SC416 requires battery input in the 5V-25V range. The highly
accurate outputs are regulated to within 1% of specified levels and
are adjustable from 0.75V to 5V, or can be configured with pre-set
voltages consisting of 1.8V or 1.5V for VOUT1 and 1.25V or 1.05V
for VOUT2. The SC416 is provided in a 4 mm x 4 mm MLP package that
is WEEE and RoHS compliant. With built-in soft-start pins, the
SC416 grants designers the flexibility to track voltage levels in
ratiometric, concentric and independent modes. This capability
benefits applications where the voltage differential between supply
rails must meet defined limits during operating conditions. It can
also be used for processors with multiple power rails, to protect
the downstream IC from excessive power dissipation caused by the
interaction of ramping power supplies during start-up or shutdown.
Employing the voltage tracking option can also reduce system costs
by eliminating the need to over-specify power rails to accommodate
excess power dissipation. For applications requiring tracking of
more than two voltage levels, multiple SC416 devices can be linked
together. The SC416 incorporates Semtech�s unique Smart-Drive�
circuitry to reduce electromagnetic interference (EMI). The reduced
EMI levels achieved from this approach contribute to a system-wide
EMI reduction effort to ensure compliance with FCC regulations. The
SC416 also features programmable current limit, output over-voltage
protection, over-temperature protection, and input under-voltage
lockout. Automatic power-save is built into the SC416 to maintain
very high efficiency in light-load conditions. The power-save
capability monitors the inductor current and shuts off the low-side
FET on a cycle-by-cycle basis to prevent reverse current. Added to
this is the Semtech Smart Power-Save, which monitors the high-side
FET for leakage or for a load dump, and will disengage the
power-save capability temporarily to protect the integrity of the
output voltages. The device is based on Semtech�s constant on-time
technology, a pseudo fixed-frequency technology that senses a
change in load or line voltage and adjusts its pulse density to
match the change. This fast response to electrical transients
minimizes output capacitance, requiring no compensation if the
minimum ESR requirements are met. �With three tracking modes, the
SC416 gives the designer the flexibility and features needed to
develop the power-up and power-modes best suited to the system
design,� said Ramesh Balasubramaniam, Marketing Manager for
Semtech�s Portable Power Management Products Group. �The SC416 also
features our best buck controller technology to drive efficiency
and lower EMI, both of which are critical to portable devices that
need long battery life and compliance to FCC standards.� Key
Features of the SC416 VBAT range: 5V-25V Output voltage range:
0.75V to 5V Flexible voltage tracking Low shutdown power at light
load conditions SmartDrive� for EMI reduction Separated
frequencies: VOUT1 � up to 600kHz; VOUT2 � up to 720kHz Pricing and
Availability The SC416 (order code: SC416MLTRT) product is
available immediately in production quantities and is priced at
$1.39 each in 1,000-piece lots. An evaluation board (order code:
SC416EVB) is also available. Semtech offers comprehensive design
assistance, including field- and factory-based support. Data
sheets, volume pricing, and delivery quotes, as well as evaluation
kits and samples, are available by contacting
salesinfo@semtech.com. About Semtech Semtech Corporation is a
leading supplier of high-quality analog and mixed-signal
semiconductor products. The company is dedicated to providing
customers with proprietary solutions and breakthrough technology in
power management, protection, advanced communications, human
interface, test & measurement, and wireless connectivity
products. Publicly traded since 1967, Semtech is listed on the
NASDAQ National Market under the symbol SMTC. For more information,
contact Semtech Corp. at 200 Flynn Road, Camarillo, CA 93012-8790;
phone (805) 498-2111; email to info@semtech.com; or visit its web
site at www.semtech.com. Semtech, the Semtech logo and Smart Drive
are marks of Semtech Corporation.
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