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LM5642XMTX bảng dữ liệu(PDF) 1 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
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VIN
4.5V - 36V
SS/ON1
SS/ON2
SYNC
UV_Delay
Vout1
1.3V-0.9VIN
Vout2
1.3V-0.9VIN
LM5642/LM5642X
LM5642, LM5642X
www.ti.com
SNVS219K – JUNE 2003 – REVISED APRIL 2013
LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator
Synchronization
Check for Samples: LM5642, LM5642X
1
FEATURES
DESCRIPTION
The LM5642 series consists of two current mode
2
Two Synchronous Buck Regulators
synchronous buck regulator controllers operating
180° Out of Phase Operation
180° out of phase with each other at a normal
200 kHz Fixed Nominal Frequency: LM5642
switching frequency of 200kHz for the LM5642 and at
375kHz for the LM5642X.
375 kHz Fixed Nominal Frequency: LM5642X
Synchronizable Switching Frequency from 150
Out of phase operation reduces the input RMS ripple
current, thereby significantly reducing the required
kHz to 250 kHz for the LM5642 and 200 kHz to
input capacitance. The switching frequency can be
500 kHz for the LM5642X
synchronized to an external clock between 150 kHz
4.5V to 36V Input Range
and 250 kHz for the LM5642 and between 200 kHz
50 µA Shutdown Current
and 500 kHz for the LM5642X. The two switching
regulator outputs can also be paralleled to operate as
Adjustable Output from 1.3V to 90% of Vin
a dual-phase, single output regulator.
0.04% (Typical) Line and Load Regulation
Accuracy
The output of each channel can be independently
adjusted from 1.3V to 90% of Vin. An internal 5V rail
Current Mode Control with or without a Sense
is also available externally for driving bootstrap
Resistor
circuitry.
Independent Enable/Soft-start Pins Allow
Current-mode feedback control assures excellent line
Simple Sequential Startup Configuration.
and load regulation and wide loop bandwidth for
Configurable for Single Output Parallel
excellent response to fast load transients. Current is
Operation. (See Figure 4)
sensed across either the Vds of the top FET or
Adjustable Cycle-by-cycle Current Limit
across an external current-sense resistor connected
in series with the drain of the top FET.
Input Under-voltage Lockout
Output Over-voltage Latch Protection
The LM5642 features analog soft-start circuitry that is
independent
of
the
output
load
and
output
Output Under-voltage Protection with Delay
capacitance making the soft-start behavior more
Thermal Shutdown
predictable and controllable than traditional soft-start
Self Discharge of Output Capacitors when the
circuits.
Regulator is OFF
Over-voltage protection is available for both outputs.
TSSOP and HTSSOP (Exposed PAD) Packages
A UV-Delay pin is also available to allow delayed shut
off time for the IC during an output under-voltage
APPLICATIONS
event.
Embedded Computer Systems
Typical Application Circuit
Navigation Systems
Telecom Systems
Set-Top Boxes
WebPAD
Point Of Load Power Architectures
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2003–2013, 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.


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