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LM2745 датащи(PDF) 1 Page - Texas Instruments

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номер детали LM2745
подробное описание детали  LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

LM2745 датащи(HTML) 1 Page - Texas Instruments

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background image
HG
BOOT
ISEN
LG
PGND
FB
VCC
SD
PWGD
FREQ/SYNC
SS/TRACK
SGND
EAO
PGND
VCC = 3.3V
VIN = 3.3V
VOUT = 1.2V@16A
RFB2
CC2
RC1
RCS
CSS
RCC
CCC
D1
CBOOT
Q1
CIN1,2
L1
+
CC1
RFB1
CO1,2
LM2745
RC2
CC3
RPULL-UP
RFADJ
CClk
Clk
Q2
+
LM2745, LM2748
www.ti.com
SNOSAL2E – APRIL 2005 – REVISED APRIL 2013
LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock
Synchronization
Check for Samples: LM2745, LM2748
1
FEATURES
DESCRIPTION
The LM2745/8 are high-speed synchronous buck
2
Switching Frequency from 50 kHz to 1 MHz
regulator
controllers
with
an
accurate
feedback
Switching Frequency Synchronize Range 250
voltage accuracy of ±1.5%. It can provide simple
kHz to 1 MHz (LM2745 Only)
down conversion to output voltages as low as 0.6V.
Startup with a Pre-biased Output Load
Though the control sections of the IC are rated for 3
to 6V, the driver sections are designed to accept
Power Stage Input Voltage from 1V to 14V
input supply rails as high as 14V. The use of adaptive
Control Stage Input Voltage from 3V to 6V
non-overlapping MOSFET gate drivers helps avoid
Output Voltage Adjustable Down to 0.6V
potential shoot-through problems while maintaining
high efficiency. The IC is designed for the more cost-
Power Good Flag and Shutdown
effective option of driving only N-channel MOSFETs
Output Overvoltage and Undervoltage
in both the high-side and low-side positions. It senses
Detection
the low-side switch voltage drop for providing a
±1.5% Feedback Voltage Accuracy Over
simple, adjustable current limit.
Temperature
The LM2745/8 features a fixed-frequency voltage-
Low-side Adjustable Current Sensing
mode PWM control architecture which is adjustable
from 50 kHz to 1 MHz with one external resistor. In
Adjustable Soft-start
addition, the LM2745 also allows the switching
Tracking and Sequencing with Shutdown and
frequency to be synchronized to an external clock
Soft Start Pins
signal over the range of 250 kHz to 1 MHz. This wide
TSSOP-14 Package
range of switching frequency gives the power supply
designer the flexibility to make better tradeoffs
APPLICATIONS
between component size, cost and efficiency.
Down Conversion from 3.3V
Features include the ability to startup with a pre-
biased
load
on
the
output,
soft-start,
input
Cable Modem, DSL and ADSL
undervoltage
lockout
(UVLO)
and
Power
Good
Laser Jet and Ink Jet Printers
(based
on
both
undervoltage
and
overvoltage
Low Voltage Power Modules
detection). In addition, the shutdown pin of the IC can
be used for providing startup delay, and the soft-start
DSP, ASIC, Core and I/O
pin can be used for implementing precise tracking, for
the purpose of sequencing with respect to an external
rail.
Typical Application
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 © 2005–2013, 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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