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

 
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background image
FB
PGOOD
VIN
LM21215A-1
VOUT
AGND
COMP
PVIN
SYNC
SW
EN
LF
RC1
CC1
CC2
CC3
RFB1
RFB2
RC2
PGND
AVIN
CF
1
11Å16
3
4
19
18
20
8,9,10
5,6,7
RF
SS/TRK
CSS
2
CIN
COUT
17
PGOOD
optional
optional
0
3
6
9
12
15
90
92
94
96
98
100
OUTPUT CURRENT (A)
VIN = 3.3V
VIN = 4.0V
VIN = 5.0V
VIN = 5.5V
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LM21215A
SNOSB87C – MARCH 2011 – REVISED JANUARY 2016
LM21215A 15-A Ultra High-Efficiency Synchronous Buck Converter With Frequency
Synchronization
1 Features
3 Description
The LM21215A is a synchronous buck DC-DC
1
High-Efficiency Synchronous DC-DC Converter
converter that delivers up to 15 A of output current at
Input Voltage Range of 2.95 V to 5.5 V
output voltages as low as 0.6 V. Operating over an
Adjustable Output Voltage From 0.6 V to VIN
input voltage range of 2.95 V to 5.5 V with ultra-high
efficiency, the LM21215A suits a wide variety of low
Output Current as High as 15 A
voltage systems. The voltage-mode control loop with
Frequency Synchronization 300 kHz to 1.5 MHz
high gain-bandwidth error amplifier provides high
Integrated 7-m
Ω PMOS Buck Switch Supports
noise immunity, narrow duty cycle capability and is
100% Duty Cycle for Low Dropout Voltage
easily compensated for stable operation with any type
of output capacitor, providing maximum flexibility and
Integrated 4.3-m
Ω NMOS Synchronous Rectifier
ease of use.
Eliminates Schottky Diode
The
LM21215A
features
internal
overvoltage
Accurate ±1% Internal Voltage Reference
protection
(OVP)
and
cycle-by-cycle
overcurrent
Automatic Diode Emulation Mode for Improved
protection (OCP) for increased system reliability. A
Efficiency at Light Loads
precision enable pin and integrated UVLO allow turn-
Monotonic Pre-Biased Startup
on of the device to be tightly controlled and
Internal 0.5-ms or Externally Adjustable Soft-Start
sequenced. Startup inrush currents are limited by an
internally-fixed
or
externally-adjustable
soft-start
Output Voltage Tracking Capability
circuit. An integrated open-drain PGOOD indicator
Ultra-Fast Line and Load Transient Response
provides fault reporting and supply sequencing.
Voltage-Mode PWM Control
Other features include auxiliary voltage rail tracking,
Wide-Bandwidth Voltage Loop Error Amplifier
monotonic
startup
into
pre-biased
loads,
and
Precision Enable with Hysteresis
switching frequency synchronization to an external
clock signal between 300 kHz and 1.5 MHz for beat-
Integrated OVP, UVP, OCP and UVLO
frequency sensitive and multi-regulator applications.
Open-Drain Power Good Indicator
The LM21215A is offered in a thermally-enhanced
Thermal Shutdown Protection With Hysteresis
20-pin HTSSOP package with an exposed pad that is
soldered to the PCB to achieve a very low junction-to-
Thermally-Enhanced HTSSOP-20 Package
board thermal impedance.
2 Applications
Device Information(1)
Telecommunications Infrastructure
PART NUMBER
PACKAGE
BODY SIZE (NOM)
DSP and FPGA Core Voltage Supplies
LM21215A
HTSSOP (20)
6.50 mm × 4.40 mm
High Efficiency POL Conversion
(1) For all available packages, see the orderable addendum at
Embedded Computing, Servers and Storage
the end of the data sheet.
Typical Application Circuit
Efficiency at 2.5 V, 500 kHz
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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