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National Semiconductor Electronic Components Datasheet

LM25005 Datasheet

STEP-DOWN SWITCHING REGULATOR

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LM25005 pdf
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February 2006
LM25005
42V, 2.5A Step-Down Switching Regulator
General Description
The LM25005 switching regulator features all of the func-
tions necessary to implement an efficient, high voltage buck
regulator using a minimum of external components. This
easy to use regulator includes a 42V, 160m, N-channel
MOSFET, with an output current capability of 2.5 Amps. The
regulator control method is based upon current mode control
utilizing an emulated current ramp. Current mode control
provides inherent line voltage feed-forward, cycle-by-cycle
current limiting and ease of loop compensation. The use of
an emulated control ramp reduces noise sensitivity of the
pulse-width modulation circuit, allowing reliable control of
very small duty cycles necessary in high input voltage appli-
cations. The operating frequency is programmable from
50kHz to 500kHz. An oscillator synchronization pin allows
multiple LM25005 regulators to self-synchronize or to be
synchronized to an external clock. Additional protection fea-
tures include: current limit, thermal shutdown and remote
shutdown capability. The device is available in a power
enhanced TSSOP-20 package featuring an exposed die
attach pad to aid thermal dissipation.
Features
n Integrated 42V, 160mN-channel MOSFET
n Ultra-wide input voltage range from 7V to 42V
n Internal bias regulator
n Adjustable output voltage from 1.225V
n 1.5% feedback reference accuracy
n Current mode control with emulated inductor current
ramp
n Single resistor oscillator frequency setting
n Oscillator synchronization input
n Programmable soft-start
n Shutdown / Standby input
n Wide bandwidth error amplifier
n Thermal Shutdown
Package
n TSSOP-20EP (Exposed Pad)
Simplified Application Schematic
© 2006 National Semiconductor Corporation DS201700
20170001
www.national.com


National Semiconductor Electronic Components Datasheet

LM25005 Datasheet

STEP-DOWN SWITCHING REGULATOR

No Preview Available !

LM25005 pdf
Connection Diagram
20170002
Top View
20-Lead TSSOP
Ordering Information
Order Number
LM25005MH
LM25005MHX
Package Type
Exposed Pad TSSOP-20
Exposed Pad TSSOP-20
NSC Package Drawing
MXA20A
MXA20A
Supplied As
73 Units in Rail
2500 Units on Tape and Reel
www.national.com
2


Part Number LM25005
Description STEP-DOWN SWITCHING REGULATOR
Maker National Semiconductor
Total Page 21 Pages
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