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LM25088Q bảng dữ liệu(PDF) 1 Page - Texas Instruments

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LM25088Q bảng dữ liệu(HTML) 1 Page - Texas Instruments

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BOOT
SW
COMP
FB
RAMP
DITH/RES
VCC
VIN
OUT
CS
CSG
VOUT
EN
HG
GND
L
D
Rs
Q
CDITHER/RESTART
CIN
CVCC
CSS
CRAMP
RRAMP
RRT
RCOMP
CCOMP
CHF
COUT1
COUT2
RFB2
RFB1
CBOOT
RUV2
RUV1
VIN (4.5V-42V)
SS
RT/SYNC
LM25088
LM25088
www.ti.com
SNVS609G – DECEMBER 2008 – REVISED MARCH 2011
LM25088/LM25088Q Wide Input Range Non-Synchronous Buck Controller
Check for Samples: LM25088
1
FEATURES
DESCRIPTION
The LM25088 high voltage non-synchronous buck
2
LM25088Q is an Automotive Grade Product
controller features all the necessary functions to
that is AEC-Q100 Grade 1 Qualified (-40°C to
implement an efficient high voltage buck converter
+125°C Operating Junction Temperature)
using a minimum number of external components.
Emulated Current Mode Control
The LM25088 can be configured to operate over an
ultra-wide input voltage range of 4.5V to 42V. This
Drives External High-Side N-Channel MOSFET
easy to use controller includes a level shifted gate
Ultra-Wide Input Voltage Range from 4.5V to
driver capable of controlling an external N-channel
42V
buck switch. The control method is based upon peak
Low IQ Shutdown and Standby Modes
current mode control utilizing an emulated current
ramp. The use of an emulated control ramp reduces
High Duty Cycle Ratio Feature for Reduced
noise sensitivity of the pulse-width modulation circuit,
Dropout Voltage
allowing reliable control of very small duty cycles
Spread Spectrum EMI Reduction (LM25088-1)
necessary in high input voltage/low output voltage
Hiccup Timer for Overload Protection
applications. The LM25088 switching frequency is
(LM25088-2)
programmable from 50 kHz to 1 MHz.
Adjustable Output Voltage from 1.205V with
The LM25088 is available in two versions: The
1.5% Feedback Reference Accuracy
LM25088-1 provides a +/-5% frequency dithering
function to reduce the conducted and radiated EMI,
Wide Bandwidth Error Amplifier
while the LM25088-2 provides a versatile restart timer
Single Resistor Oscillator Frequency Setting
for overload protection. Additional features include a
Oscillator Synchronization Capability
low dropout bias regulator, tri-level enable input to
Programmable Soft-Start
control shutdown and standby modes, soft-start and
oscillator synchronization capability. The device is
High Voltage, Low Dropout Bias Regulator
available in a thermally enhanced HTSSOP-16 pin
Thermal Shutdown Protection
package.
PACKAGE
HTSSOP-16
Simplified Application Schematic
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 © 2008–2011, 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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