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器件3D模型￥ 14.021
LM5642MTCX/NOPB 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
DC/DC转换器
封装:
TSSOP-28
描述:
LM5642 / LM5642X高电压，双通道同步降压转换器与振荡器同步 LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P2P3Hot
典型应用电路图在P1
原理图在P9
封装尺寸在P34P36P37P39
焊盘布局在P40
标记信息在P34P35
封装信息在P34P35P36P37
技术参数、封装参数在P4P5P6
应用领域在P1P42
电气规格在P4P5P6P10P11P12P13
导航目录
LM5642MTCX/NOPB数据手册
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V
IN
4.5V - 36V
SS/ON1
SS/ON2
SYNC
UV_Delay
Vout1
1.3V-0.9V
IN
Vout2
1.3V-0.9V
IN
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.
2All 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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