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LM20143QMH датащи(PDF) 11 Page - Texas Instruments

номер детали LM20143QMH
подробное описание детали  3-A PowerWise Adjustable Frequency Synchronous Buck Regulator
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM20143QMH датащи(HTML) 11 Page - Texas Instruments

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4.8A
+
-
COMP
CONTROL
LOGIC
CURRENT
LIMIT
OVERVOLTAGE
UNDERVOLTAGE
ERROR AMP
PWM COMPARATOR
SS/TRK
PGOOD
+
-
+2.7V
REGULATOR
PVIN
PVIN
THERMAL
PROTECTION
PGND
SW
AVIN
CURRENT SENSE
VCC
1.18V
UVLO
2.7V
AGND
OSCILLATOR
+
752 mV
864 mV
PG-L
PG-L
2.7V
5 PA
gm = 510 Pmho
800 mV
+
-
+
DISCHARGE
DISCHARGE
SLOPE COMP
DIODE
EMULATION
+
-
VREF
+
-
FB
EN
+
-
+
-
(50 Ps)
+
-
+
-
RT
PVIN
LM20143, LM20143-Q1
www.ti.com
SNVS528H – OCTOBER 2007 – REVISED JANUARY 2016
7 Detailed Description
7.1 Overview
The LM20143 switching regulator features all of the functions necessary to implement an efficient low voltage
buck regulator using a minimum number of external components. This easy to use regulator features two
integrated switches and is capable of supplying up to 3 A of continuous output current. The regulator utilizes
peak current mode control with nonlinear slope compensation to optimize stability and transient response over
the entire output voltage range. Peak current mode control also provides inherent line feed-forward, cycle-by-
cycle current limiting and easy loop compensation. The switching frequency can be varied from 500 kHz to 1.5
MHz with an external resistor to ground. The device can operate at high switching frequency allowing use of a
small inductor while still achieving efficiencies as high as 96%. The precision internal voltage reference allows
the output to be set as low as 0.8 V. Fault protection features include: current limiting, thermal shutdown, over
voltage protection, and shutdown capability. The device is available in the HTSSOP 16-pin package featuring an
exposed pad to aid thermal dissipation. The LM20143 can be used in numerous applications to efficiently step-
down from a 5 V or 3.3 V bus. The typical application circuit for the LM20143 is shown in Figure 32 in the design
guide.
7.2 Functional Block Diagram
Copyright © 2007–2016, Texas Instruments Incorporated
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Product Folder Links: LM20143 LM20143-Q1


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