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LM3477MMX Datasheet

  • LM3477MMX

  • High Efficiency High-Side N-Channel Controller for Switching...

  • 23頁

  • NSC

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LM3477/LM3477A High Efficiency High-Side N-Channel Controller for Switching Regulator
June 2002
LM3477/LM3477A
High Efficiency High-Side N-Channel Controller for
Switching Regulator
General Description
The LM3477/A is a high-side N-channel MOSFET switching
regulator controller. It can be used in topologies requiring a
high side MOSFET such as buck, inverting (buck-boost) and
zeta regulators. The LM3477/A鈥檚 internal push pull driver
allows compatibility with a wide range of MOSFETs. This, the
wide input voltage range, use of discrete power components
and adjustable current limit allows the LM3477/A to be opti-
mized for a wide variety of applications.
The LM3477/A uses a high switching frequency of 500kHz to
reduce the overall solution size. Current-mode control re-
quires only a single resistor and capacitor for frequency
compensation. The current mode architecture also yields
superior line and load regulation and cycle-by-cycle current
limiting. A 5碌A(chǔ) shutdown state can be used for power sav-
ings and for power supply sequencing. Other features in-
clude internal soft-start and output over voltage protection.
The internal soft-start reduces inrush current. Over voltage
protection is a safety feature to ensure that the output volt-
age stays within regulation.
The LM3477A is similar to the LM3477. The primary differ-
ence between the two is the point at which the device
transitions into hysteretic mode. The hysteretic threshold of
the LM3477A is one-third of the LM3477.
n
Frequency compensation optimized with a single
capacitor and resistor
n
Internal softstart
n
Current mode operation
n
Undervoltage lockout with hysteresis
n
8-lead Mini-SO8 (MSOP-8) package
Applications
n
n
n
n
n
n
n
n
Local Voltage Regulation
Distributed Power
Notebook and Palmtop Computers
Internet Appliances
Printers and Office Automation
Battery operated Devices
Cable Modems
Battery Chargers
Hysteretic
Threshold
LM3477
)
36% of
programmed current
limit
)
12% of
programmed current
limit
LM3477A
Features
n
n
n
n
500kHz switching frequency
Adjustable current limit
1.5% reference
Thermal shutdown
*
See Hysteretic Threshold and section for more information.
Typical Application Circuit
20003333
Typical High Efficiency Step-Down (Buck) Converter
漏 2002 National Semiconductor Corporation
DS200033
www.national.com

LM3477MMX 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 2.97 V to 35 V

  • 1.265 V

  • 6 A

  • 1

  • + 125 C

  • SMD/SMT

  • MSOP

  • - 40 C

  • Reel

  • 3500

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