LM3488 Datasheet, PDF (1/37 Pages) National Semiconductor (TI) – High Efficiency Low-Side N-Channel Controller for Switching Regulators

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LM3488, LM3488-Q1
SNVS089N – JULY 2000 – REVISED DECEMBER 2014
LM3488/-Q1 High-Efficiency, Low-Side, N-Channel Controller for Switching Regulators
1 Features
•1 LM3488-Q1 is AEC-Q100 Qualified and
Manufactured on an Automotive-Grade Flow
• 8-Lead VSSOP Package
• Internal Push-Pull Driver With 1-A Peak Current
Capability
• Current Limit and Thermal Shutdown
• Frequency Compensation Optimized With a
Capacitor and a Resistor
• Internal Soft-Start
• Current Mode Operation
• Undervoltage Lockout With Hysteresis
• Key Specifications:
– Wide Supply Voltage Range of 2.97 V to 40 V
– 100-kHz to 1-MHz Adjustable and
Synchronizable Clock Frequency
– ±1.5% (Overtemperature) Internal Reference
– 5-µA Shutdown Current (Overtemperature)
2 Applications
• Distributed Power Systems
• Notebook, PDA, Digital Camera, and other
Portable Applications
• Offline Power Supplies
• Set-Top Boxes
3 Description
The LM3488 is a versatile low-side N-FET high-
performance controller for switching regulators. This
device 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 to reduce the overall
solution size. The switching frequency of LM3488 can
be adjusted to any value from 100 kHz to 1 MHz 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 overvoltage
protection. Power-saving shutdown mode reduces the
total supply current to 5 µA and allows power supply
sequencing. Internal soft-start limits the inrush current
at start-up.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM3488
LM3488-Q1
VSSOP (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical SEPIC Converter
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.