LM5088_14 Datasheet, PDF (1/36 Pages) Texas Instruments – Wide Input Range Non-Synchronous Buck Controller

LM5088
www.ti.com
SNVS600G – DECEMBER 2008 – REVISED MARCH 2011
LM5088/LM5088Q Wide Input Range Non-Synchronous Buck Controller
Check for Samples: LM5088
FEATURES
1
•2 LM5088Q is an Automotive Grade Product that
is AEC-Q100 Grade 1 Qualified (-40°C to
+125°C Operating Junction Temperature)
• Emulated Current Mode Control
• Drives External High-Side N-channel MOSFET
• Ultra-Wide Input Voltage Range from 4.5V to
75V
• Low I_Q Shutdown and Standby Modes
• High Duty Cycle Ratio Feature for Reduced
Dropout Voltage
• Spread Spectrum EMI Reduction (LM5088-1)
• Hiccup Timer for Overload Protection
(LM5088-2)
• Adjustable Output Voltage from 1.205V with
1.5% Feedback Reference Accuracy
• Wide Bandwidth Error Amplifier
• Single Resistor Oscillator Frequency Setting
• Oscillator Synchronization Capability
• Programmable Soft-Start
• High Voltage, Low Dropout Bias Regulator
• Thermal Shutdown Protection
DESCRIPTION
The LM5088 high voltage non-synchronous buck
controller features all the necessary functions to
implement an efficient high voltage buck converter
using a minimum number of external components.
The LM5088 can be configured to operate over an
ultra-wide input voltage range of 4.5V to 75V. This
easy to use controller includes a level shifted gate
driver capable of controlling an external N-channel
buck switch. The control method is based upon peak
current mode control utilizing an emulated current
ramp. 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/low output voltage
applications. The LM5088 switching frequency is
programmable from 50 kHz to 1 MHz.
The LM5088 is available in two versions: The
LM5088-1 provides a +/-5% frequency dithering
function to reduce the conducted and radiated EMI,
while the LM5088-2 provides a versatile restart timer
for overload protection. Additional features include a
low dropout bias regulator, tri-level enable input to
control shutdown and standby modes, soft-start and
oscillator synchronization capability. The device is
available in a thermally enhanced HTSSOP-16 pin
package.
PACKAGE
• HTSSOP-16
1
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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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