Semtech's Newest 1A Synchronous Buck Regulator for Portables Offers Four Digitally-Controlled Outputs Between 2.5V and 3.6V
07 Diciembre 2006 - 7:00AM
Business Wire
Semtech Corp. (Nasdaq:SMTC), a leading supplier of analog and
mixed-signal semiconductors for communications, portable devices,
computers, and industrial equipment, today announced the SC194B, a
highly integrated 1A DC-DC step-down (buck) regulator with the
small size and output flexibility needed for portable device
applications. The SC194B has an input voltage range from 2.7V to
5.5V with a focus on portable applications that use Li-ion
batteries. It is a sister part to the recently announced SC194A,
which is feature compatible but offers outputs between 1V and 1.8V.
The SC194B uses two programming pins to allow engineers to set the
output voltage to 2.5V, 3.0V, 3.3V or 3.6V. These pins can be
hard-wired to set a constant voltage, or they can be tied to a
microcontroller and dynamically switched for applications that use
digital power control. The highly integrated feature set of the
SC194B goes beyond the voltage programming pins which eliminate the
need for voltage-setting resistors on the output. The device
includes an internal compensation network, integrates the switching
Field Effect Transistors (FETs), and eliminates the need for an
external Schottky diode. Complete power regulation is achieved
using only the SC194B and three discrete components, giving the
user four output voltage options with a minimal bill of materials.
�The SC194B addresses the I/O voltage rail with the same high
performance and small size benefits that the SC194A delivers for
the microprocessor core voltage,� said Karl Volk, Director of
Marketing for Semtech�s Handheld Power Management Group. �Not only
do the high efficiency and ultra-low quiescent current reduce heat
and extend battery life, but the SC194B�s digitally-controlled
output voltage minimizes PCB area by eliminating external feedback
while still allowing our customers to purchase and manage inventory
for only one device to meet the 2.5V to 3.6V needs of many
designs.� The SC194B is designed for high efficiency at all loads
to maximize the battery life. The device features up to 95% maximum
efficiency at 3.3V, 200mA output. An automatic power save mode
(PSAVE) uses pulse frequency modulation (PFM) at light loads to
maintain very high device efficiency. While in PSAVE mode, the
device quiescent current is only 17�A. PSAVE mode operation is
monitored such that the device automatically detects when to
disable this operation or can be manually taken out of PSAVE mode
by toggling a single control pin. This is useful in controlling the
electrical noise floor created by a switching regulator topology.
Additionally, the flexible clocking scheme allows the engineer to
select the internal 1MHz fixed clock or connect the device to an
external oscillator between 750kHz and 1.25MHz for applications
requiring a different frequency or clock synchronization. The
SC194B has built-in soft-start, short-circuit, over voltage and
temperature protection features. Furthermore, fast transient
reaction protects sensitive loads from extensive supply voltage
variations. The SC194B comes in a 3mm x 3mm lead-free and RoHS
compliant MLP-10 package. Key Features of the SC194B Up to 95%
efficiency (3.3V out) 1A output current Wide input voltage range:
2.7V to 5.5V Pin-selectable output voltages, 2.5V, 3.0V, 3.3V, 3.6V
17�A quiescent current 100% duty cycle operation Fixed 1 MHz
frequency or synchronizable between 750kHz to 1.25MHz Tight load
regulation across all power, load and temperature conditions 3mm x
3mm MLP-10 package (1mm max. height) Pricing and Availability The
SC194B is available immediately in production quantities and is
priced at $1.69 each in 1,000-piece lots. Ordering code for the
part is SC194BMLTRT. 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 and the Semtech logo are marks of
Semtech Corporation.
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