LM5009_15 Datasheet, PDF (1/26 Pages) Texas Instruments – Wide Input, 100-V,150-mA, Step-Down Switching Regulator

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LM5009
SNVS402H – FEBRUARY 2006 – REVISED OCTOBER 2015
LM5009 Wide Input, 100-V,150-mA, Step-Down Switching Regulator
1 Features
•1 Integrated N-Channel MOSFET
• 150-mA Output Current Capability
• Ultra-Fast Transient Response
• No Loop Compensation Required
• V_IN Feed-Forward Provides Constant Operating
Frequency
• Switching Frequency Can Exceed 600 kHz
• Highly Efficient Operation
• 2% Accurate 2.5-V 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
2 Applications
• Heat Sink Eliminator for Classic Linear Regulator
Applications
• 12-V, 24-V, 36-V, and 48-V Rectified AC Systems
• 42-V Automotive
• Non-Isolated AC Mains Charge-Coupled Supplies
• LED Current Source
3 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 9.5-V to 95-V
input source. The switching frequency can exceed
600 kHz, depending on the input and output voltages.
The output voltage can be set from 2.5 V to 85 V.
This high-voltage regulator contains an N-channel
buck switch and an internal startup regulator. The
device is easy to implement and is provided in 8-pin
VSSOP and 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 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 ultrafast transient
response. An intelligent current limit is implemented
with forced off-time that is inversely proportional to
V_OUT. This scheme ensures short-circuit protection
and provides minimum foldback. Other features
include thermal shutdown, V_CC undervoltage lockout,
gate drive undervoltage lockout, and maximum duty
cycle limiter.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM5009
VSSOP (8)
WSON (8)
3.00 mm × 3.00 mm
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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
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.