Datasheet
V
OUT
RON/SD
FB
VIN
SW
RTN
BST
L1
C2
R1
R2
C4
C3
C1
SHUTDOWN
RCL
VCC
D1
R
ON
R
CL
9.5 - 95V
Input
LM5009
LM5009
www.ti.com
SNVS402G –FEBRUARY 2006–REVISED FEBRUARY 2013
150-mA 100-V Step-Down Switching Regulator
Check for Samples: LM5009
1
FEATURES
DESCRIPTION
The LM5009 Step Down Switching Regulator features
2
• Integrated N-Channel MOSFET
all of the functions needed to implement a low cost,
• 150-mA output current capability
efficient, Buck bias regulator. This device is capable
• Ultra-Fast Transient Response
of driving a 150 mA load current from a 9.5V to 95V
input source. The switching frequency can exceed
• No loop compensation required
600 kHz, depending on the input and output voltages.
• Vin feed forward provides constant operating
The output voltage may be set from 2.5V to 85V. This
frequency
high voltage regulator contains an N-Channel buck
• Switching frequency can exceed 600 kHz
switch and internal startup regulator. The device is
easy to implement and is provided in the 8-pin
• Highly efficient operation
VSSOP and the thermally enhanced 8-pin WSON
• 2% accurate 2.5V feedback from -40°C to
packages. The LM5009 is a well suited alternative to
125°C
a high voltage monolithic or discrete linear solution
• Internal startup regulator
where the power loss becomes unacceptable. The
regulator’s operation is based on a control scheme
• Intelligent current limit protection
using an ON time inversely proportional to VIN. This
• External shutdown control
feature allows the operating frequency to remain
• Thermal shutdown
relatively constant over load and input voltage
variations. The control scheme requires no loop
• 8-Pin VSSOP and thermally enhanced 8-Pin
compensation, resulting in an ultra-fast transient
WSON packages
response. An intelligent current limit is implemented
with forced OFF time, which is inversely proportional
APPLICATIONS
to Vout. This scheme ensures short circuit protection
• Heat sink eliminator for classic linear regulator
while providing minimum foldback. Other features
applications
include: Thermal Shutdown, Vcc under-voltage
lockout, Gate drive under-voltage lockout, and
• 12V, 24V, 36V, and 48V rectified AC systems
Maximum Duty Cycle limiter.
• 42V Automotive
• Non-isolated AC mains charge coupled
supplies
• LED Current Source
Typical Application Circuit
Figure 1. Basic Step-Down Regulator
1
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PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.