LM3488MM Datasheet, PDF (1/33 Pages) Texas Instruments – High Efficiency Low-Side N-Channel Controller for Switching Regulators

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LM3488
LM3488-Q1
SNVS089M – JULY 2000 – REVISED MARCH 2013
High Efficiency Low-Side N-Channel Controller for Switching Regulators
Check for Samples: LM3488, LM3488-Q1
FEATURES
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•2 LM3488Q is AEC-Q100 qualified and
manufactured on an Automotive Grade Flow
• 8-lead VSSOP package
• Internal push-pull driver with 1A peak current
capability
• Current limit and thermal shutdown
• Frequency compensation optimized with a
capacitor and a resistor
• Internal softstart
• Current Mode Operation
• Undervoltage Lockout with hysteresis
APPLICATIONS
• Distributed Power Systems
• Notebook, PDA, Digital Camera, and other
Portable Applications
• Offline Power Supplies
• Set-Top Boxes
DESCRIPTION
The LM3488 is a versatile Low-Side N-FET high
performance controller for switching regulators. It is
suitable for use in topologies requiring low side FET,
such as boost, flyback, or SEPIC. Moreover, the
LM3488 can be operated at extremely high switching
frequency in order to reduce the overall solution size.
The switching frequency of LM3488 can be adjusted
to any value between 100kHz and 1MHz by using a
single external resistor or by synchronizing it to an
external clock. Current mode control provides
superior bandwidth and transient response, besides
cycle-by-cycle current limiting. Output current can be
programmed with a single external resistor.
The LM3488 has built in features such as thermal
shutdown, short-circuit protection and over voltage
protection. Power saving shutdown mode reduces the
total supply current to 5µA and allows power supply
sequencing. Internal soft-start limits the inrush current
at start-up.
KEY SPECIFICATIONS
• Wide supply voltage range of 2.97V to 40V
• 100kHz to 1MHz Adjustable and
Synchronizable clock frequency
• ±1.5% (over temperature) internal reference
• 5µA shutdown current (over temperature)
TYPICAL APPLICATION CIRCUIT
Figure 1. Typical SEPIC Converter
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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.
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