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LM25088-Q1

更新时间： 2024-11-16 00:52:59
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德州仪器 - TI /
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39页 1276K
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LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller

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LM25088, LM25088-Q1  
SNVS609J –DECEMBER 2008–REVISED JANUARY 2015  
LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller  
1 Features  
3 Description  
The LM25088 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 LM25088 can be configured to operate over an  
ultra-wide input voltage range of 4.5 V to 42 V. 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 LM25088 switching frequency is  
programmable from 50 kHz to 1 MHz.  
1
•
LM25088Q 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 42V  
Low IQ Shutdown and Standby Modes  
High Duty Cycle Ratio Feature for Reduced  
Dropout Voltage  
•
•
Spread Spectrum EMI Reduction (LM25088-1)  
Hiccup Timer for Overload Protection (LM25088-  
2)  
•
Adjustable Output Voltage from 1.205 V with 1.5%  
Feedback Reference Accuracy  
The LM25088 is available in two versions: The  
LM25088-1 provides a +/-5% frequency dithering  
function to reduce the conducted and radiated EMI,  
while the LM25088-2 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.  
•
•
•
•
•
•
•
Wide Bandwidth Error Amplifier  
Single Resistor Oscillator Frequency Setting  
Oscillator Synchronization Capability  
Programmable Soft-Start  
High Voltage, Low Dropout Bias Regulator  
Thermal Shutdown Protection  
Package: HTSSOP 16-Pin  
Device Information(1)  
2 Applications  
•
•
•
Automotive Infotainment  
PART NUMBER  
LM25088  
PACKAGE  
HTSSOP (16)  
HTSSOP (16)  
BODY SIZE (NOM)  
5.00 mm × 4.40 mm  
5.00 mm × 4.40 mm  
Automotive USB Accessory Adapters  
Industrial DC-DC Bias and Motor Drivers  
LM25088-Q1  
(1) For all available packages, see the orderable addendum at  
the end of the datasheet.  
4 Simplified Schematic  
VIN (4.5V-42V)  
Typical Application Circuit Efficiency  
R
R
UV2  
UV1  
VIN  
BOOT  
C
BOOT  
EN  
Q
C
HG  
SW  
IN  
C
L
VOUT  
DITH/RES  
DITHER/RESTART  
R
R
FB2  
LM25088  
D
C
OUT1  
C
OUT2  
CS  
VCC  
FB1  
R
Rs  
RAMP  
C
VCC  
CSG  
OUT  
RAMP  
C
RAMP  
C
SS  
SS  
RT/SYNC  
FB  
R
RT  
C
R
COMP  
COMP  
GND  
COMP  
C
HF  
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.  
 
 
 
 
 
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LM25088-Q1 替代型号

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