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LM21212-2 Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza LM21212-2
Descripción Electrónicos  12A High Efficiency Synchronous Buck Regulator with Adjustable Switching Frequency
Download  32 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM21212-2 Datasheet(HTML) 1 Page - Texas Instruments

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background image
FB
PGOOD
VIN
LM21212-2
VOUT
AGND
COMP
PVIN
FADJ
SW
EN
CIN
COUT
LOUT
RC1
CC1
CC2
CC3
RFB1
RFB2
RC2
PGND
AVIN
CF
1
11-16
3
4
17
19
18
20
8,9,10
5,6,7
RF
SS/
TRK
CSS
2
optional
HTSSOP-20
optional
RADJ
LM21212-2
www.ti.com
SNVS715A – MARCH 2011 – REVISED MARCH 2013
12A High Efficiency Synchronous Buck Regulator with Adjustable Switching Frequency
Check for Samples: LM21212-2
1
FEATURES
DESCRIPTION
The LM21212-2 is a monolithic synchronous buck
2
Integrated 7.0 m
Ω High Side and 4.3 mΩ Low
regulator that is capable of delivering up to 12A of
Side FET Switches
continuous output current while producing an output
300 kHz to 1.55 MHz Resistor-Adjustable
voltage down to 0.6V with outstanding efficiency. The
Frequency
device is optimized to work over an input voltage
range of 2.95V to 5.5V, making it suited for a wide
Adjustable Output Voltage from 0.6V to VIN
variety of low voltage systems. The voltage mode
(100% Duty Cycle Capable), ±1% Reference
control loop provides high noise immunity, narrow
Input Voltage Range 2.95V to 5.5V
duty cycle capability and can be compensated to be
Startup Into Pre-Biased Loads
stable with any type of output capacitance, providing
maximum flexibility and ease of use.
Output Voltage Tracking Capability
Wide Bandwidth Voltage Loop Error Amplifier
The
LM21212-2
features
internal
over
voltage
protection (OVP) and over-current protection (OCP)
Adjustable Soft-Start With External Capacitor
for increased system reliability. A precision enable pin
Precision Enable Pin With Hysteresis
and integrated UVLO allow turn-on of the device to
Integrated OVP, OCP, OTP, UVLO and Power-
be tightly controlled and sequenced. Startup inrush
Good
currents are limited by both an internally fixed and
externally adjustable soft-start circuit. Fault detection
Thermally Enhanced HTSSOP-20 Exposed Pad
and
supply
sequencing
are
possible
with
the
Package
integrated power good circuit.
APPLICATIONS
The LM21212-2 is designed to work well in multi-rail
power supply architectures. The output voltage of the
Broadband, Networking and Wireless
device can be configured to track an external voltage
Communications
rail using the SS/TRK pin. The switching frequency
High-Performance FPGAs, ASICs and
can be programmed between 300 kHz and 1.55 MHz
Microprocessors
with an external resistor.
Simple to Design, High Efficiency Point of
If the output is pre-biased at startup, it will not sink
Load Regulation from a 5V or 3.3V Bus
current, allowing the output to smoothly rise past the
pre-biased voltage. The regulator is offered in a 20-
pin HTSSOP package with an exposed pad that can
be soldered to the PCB, eliminating the need for
bulky heatsinks.
SIMPLIFIED APPLICATION CIRCUIT
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 © 2011–2013, 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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