LM5009MMX Datasheet, PDF (1/22 Pages) Texas Instruments – 150-mA 100-V Step-Down Switching Regulator

LM5009
www.ti.com
SNVS402G – FEBRUARY 2006 – REVISED FEBRUARY 2013
150-mA 100-V Step-Down Switching Regulator
Check for Samples: LM5009
FEATURES
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•2 Integrated N-Channel MOSFET
• 150-mA output current capability
• Ultra-Fast Transient Response
• No loop compensation required
• Vin feed forward provides constant operating
frequency
• Switching frequency can exceed 600 kHz
• Highly efficient operation
• 2% accurate 2.5V feedback from -40°C to
125°C
• Internal startup regulator
• Intelligent current limit protection
• External shutdown control
• Thermal shutdown
• 8-Pin VSSOP and thermally enhanced 8-Pin
WSON packages
APPLICATIONS
• Heat sink eliminator for classic linear regulator
applications
• 12V, 24V, 36V, and 48V rectified AC systems
• 42V Automotive
• Non-isolated AC mains charge coupled
supplies
• LED Current Source
DESCRIPTION
The LM5009 Step Down Switching Regulator features
all of the functions needed to implement a low cost,
efficient, Buck bias regulator. This device is capable
of driving a 150 mA load current from a 9.5V to 95V
input source. The switching frequency can exceed
600 kHz, depending on the input and output voltages.
The output voltage may be set from 2.5V to 85V. This
high voltage regulator contains an N-Channel buck
switch and internal startup regulator. The device is
easy to implement and is provided in the 8-pin
VSSOP and the thermally enhanced 8-pin WSON
packages. The LM5009 is a well suited alternative to
a high voltage monolithic or discrete linear solution
where the power loss becomes unacceptable. The
regulator’s operation is based on a control scheme
using an ON time inversely proportional to VIN. This
feature allows the operating frequency to remain
relatively constant over load and input voltage
variations. The control scheme requires no loop
compensation, resulting in an ultra-fast transient
response. An intelligent current limit is implemented
with forced OFF time, which is inversely proportional
to Vout. This scheme ensures short circuit protection
while providing minimum foldback. Other features
include: Thermal Shutdown, Vcc under-voltage
lockout, Gate drive under-voltage lockout, and
Maximum Duty Cycle limiter.
Typical Application Circuit
9. 5- 95V
Input
VIN
C1
R_ON
RON/SD
SHUTDOWN
RCL
LM5009
VCC
C3
BST
SW
C4
L1
D1
R1
VOUT
C2
R _CL
RTN
FB
R2
Figure 1. Basic Step-Down Regulator
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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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