LM2833_14 Datasheet, PDF (1/30 Pages) Texas Instruments – 1.5MHz/3MHz 3.0A Step-Down DC-DC Switching Regulator

LM2833
www.ti.com
SNVS505D – MAY 2008 – REVISED JANUARY 2009
LM2833 1.5MHz/3MHz 3.0A Step-Down DC-DC Switching Regulator
Check for Samples: LM2833
FEATURES
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•2 Input Voltage Range of 3.0V to 5.5V
• Output Voltage Range of 0.6V to 4.5V
• Tiny MSOP-PowerPAD 10 or WSON-10
Package
• 3.0A Steady-State Output Current
• High Switching Frequencies
– 1.5MHz (LM2833X)
– 3.0MHz (LM2833Z)
• Enable Pin
• 56mΩ PMOS Switch
• 0.6V, 2% Internal Voltage Reference Over Line
and Temperature
• Internal Soft-Start
• Internally Compensated Peak Current-Mode
Control
• Cycle-by-Cycle Current Limit and Thermal
Shutdown
• Frequency Foldback Protection
• Input Voltage UVLO (Under-Voltage Lockout)
• Output Over-Voltage Protection
APPLICATIONS
• Multimedia Set Top Box
• Broadband Communications
• Core Power in HDDs
• Data Acquisition/Telemetry
• USB Powered Devices
• DSL Modems
DESCRIPTION
The LM2833 regulator is a monolithic, high frequency,
PWM step-down DC/DC converter available in a 10-
pin WSON or MSOP-PowerPAD package. It contains
all the active functions to provide local DC/DC
conversion with fast transient response and accurate
regulation in the smallest possible PCB area. With a
minimum of external components, the LM2833 is
easy to use. The ability to drive 3.0A loads with an
internal 56 mΩ PMOS switch using state-of-the-art
0.5µm BiCMOS technology results in the best power
density available. The world-class control circuitry
allows on-times as low as 30ns, thus supporting
exceptionally high frequency conversion over the
entire 3V to 5.5V input operating range down to the
minimum output voltage of 0.6V. Switching frequency
is internally set to 1.5MHz or 3.0MHz, allowing the
use of extremely small surface mount inductors and
capacitors. Even though the operating frequency is
high, efficiencies up to 93% are easy to achieve.
External shutdown is included, featuring an ultra-low
stand-by current of 300nA. The LM2833 utilizes peak
current-mode control and internal compensation to
provide high-performance regulation over a wide
range of operating conditions. Additional features
include internal soft-start circuitry to reduce inrush
current, cycle-by-cycle current limit, frequency
foldback, thermal shutdown, and output over-voltage
protection.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2009, Texas Instruments Incorporated