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LM21215AMHE-1 Datasheet(PDF) 11 Page - Texas Instruments

Part No. LM21215AMHE-1
Description  15-A Ultra High-Efficiency Synchronous Buck Converter
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM21215AMHE-1 Datasheet(HTML) 11 Page - Texas Instruments

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background image
Control
Logic
Thermal
Shutdown
OSC
RAMP
INT
SS
VREF
0.6V
+
Å
AVIN
EN
SYNC
SS/TRK
FB
COMP
AGND
PGND
PGOOD
SW
PVIN
PWM
Comparator
UVLO
Precision
Enable
UVP
SD
ILIMIT Low
ILIMIT High
Zero-cross
OVP
PowerBAD
PWM
0.675V
0.54V
PLL
AVIN
AVIN
PVIN
PVIN
OR
OR
OR
+
Å
+
Å
+
Å
+
Å
+
Å
EA
+
Å
+
Å
2.7V
1.35V
0.6V
1.9 A
+
Driver
Driver
LM21215A
www.ti.com
SNOSB87C – MARCH 2011 – REVISED JANUARY 2016
7 Detailed Description
7.1 Overview
The LM21215A synchronous buck regulator features all of the functions necessary to implement an efficient low-
voltage converter using a minimum number of external components. This easy-to-use regulator features two
integrated power MOSFET switches and is capable of supplying up to 15 A of continuous output current.
Synchronous rectification yields high efficiency for low output voltage and high load current applications, whereas
discontinuous conduction mode (DCM) with diode emulation mode (DEM) enables high-efficiency conversion
with light load current conditions.
The regulator utilizes voltage-mode control with trailing-edge PWM modulation to optimize stability and transient
response over the entire input voltage range. The device operates at high switching frequency, allowing the use
of a small inductor yet still achieving high efficiency. The precision internal voltage reference allows output
voltages as low as 0.6 V. Fault protection features include peak and valley current limiting, thermal shutdown,
overvoltage protection, and undervoltage lockout. The device is available in the HTSSOP-20 package featuring
an exposed pad to aid thermal dissipation. The LM21215A is ideal for numerous applications to efficiently step-
down from a 5-V or 3.3-V bus.
7.2 Functional Block Diagram
Copyright © 2011–2016, Texas Instruments Incorporated
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