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LM2734YQMK/NOPB bảng dữ liệu(PDF) 7 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Thin SOT 1-A Load Step-Down DC-DC Regulator
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LM2734YQMK/NOPB bảng dữ liệu(HTML) 7 Page - Texas Instruments

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L
R
1
R
2
D
1
D2
BOOST
Output
Control
Logic
Current
Limit
Thermal
Shutdown
Under
Voltage
Lockout
Corrective Ramp
Reset
Pulse
PWM
Comparator
Current-Sense Amplifier
RSENSE
+
+
Internal
Regulator
and
Enable
Circuit
Oscillator
Driver
0.3:
Switch
Internal
Compensation
SW
EN
FB
GND
Error Amplifier
-
+
VREF
0.8V
COUT
ON
OFF
VBOOST
IL
VSW
+
-
CBOOST
VOUT
CIN
VIN
VIN
ISENSE
+
-
+
-
0.88V
-
+
OVP
Comparator
Error
Signal
LM2734Z, LM2734Z-Q1
www.ti.com
SNVS334F – JANUARY 2005 – REVISED JANUARY 2016
7 Detailed Description
7.1 Overview
The LM2734Z is a constant frequency buck regulator that can deliver load current of 1 A. Device is optimized for
high-efficiency operation and includes a number of features that make it suitable for demanding applications.
High switching frequency allows for use of small external components enabling small solution size and saving
board space.
Device is designed to operate from wide input voltage range up to 20 V, making it ideal for wide range of
applications (such as automotive, industrial, communications, and so forth). LM2734Z can be controlled through
shutdown pin, consuming only 30 nA in standby mode, making it very appealing for applications that demand
very low standby power consumption.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Theory of Operation
The LM2734Z is a constant frequency PWM buck regulator IC that delivers a 1-A load current. The regulator has
a preset switching frequency of 3 MHz. This high frequency allows the LM2734Z to operate with small surface
mount capacitors and inductors, resulting in a DC–DC converter that requires a minimum amount of board
space. The LM2734Z is internally compensated, so it is simple to use, and requires few external components.
The LM2734Z uses current-mode control to regulate the output voltage.
The following operating description of the LM2734Z refers to the Functional Block Diagram and to the waveforms
in Figure 7. The LM2734Z supplies a regulated output voltage by switching the internal NMOS control switch at
constant frequency and variable duty cycle. A switching cycle begins at the falling edge of the reset pulse
generated by the internal oscillator. When this pulse goes low, the output control logic turns on the internal
NMOS control switch. During this ON-time, the SW pin voltage (VSW) swings up to approximately VIN, and the
inductor current (IL) increases with a linear slope. IL is measured by the current-sense amplifier, which generates
an output proportional to the switch current. The sense signal is summed with the corrective ramp of the
Copyright © 2005–2016, Texas Instruments Incorporated
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7
Product Folder Links: LM2734Z LM2734Z-Q1


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