lm21215mhx National Semiconductor Corporation, lm21215mhx Datasheet
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lm21215mhx
Manufacturer Part Number
lm21215mhx
Description
15a High Efficiency Synchronous Buck Regulator
Manufacturer
National Semiconductor Corporation
Datasheet
1.LM21215MHX.pdf
(24 pages)
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© 2011 National Semiconductor Corporation
15A High Efficiency Synchronous Buck Regulator
General Description
The LM21215 is a monolithic synchronous buck regulator that
is capable of delivering up to 15A of continuous output current
while producing an output voltage down to 0.6V with out-
standing efficiency. The device is optimized to work over an
input voltage range of 2.95V to 5.5V, making it suited for a
wide variety of low voltage systems. The voltage mode control
loop provides high noise immunity, narrow duty cycle capa-
bility and can be compensated to be stable with any type of
output capacitance, providing maximum flexibility and ease of
use.
The LM21215 features internal over voltage protection (OVP)
and resistor-programmable over-current protection (OCP) for
increased system reliability. A precision enable pin and inte-
grated UVLO allow turn-on of the device to be tightly con-
trolled and sequenced. Startup inrush currents are limited by
both an internally fixed and externally adjustable soft-start
circuit. Fault detection and supply sequencing are possible
with the integrated power good circuit.
The LM21215 is designed to work well in multi-rail power
supply architectures. The output voltage of the device can be
configured to track an external voltage rail using the SS/TRK
pin. If the output is pre-biased at startup, it will not sink current,
allowing the output to smoothly rise past the pre-biased volt-
age. The regulator is offered in a 20-pin eTSSOP package
with an exposed pad that can be soldered to the PCB, elimi-
nating the need for bulky heatsinks.
Simplified Application Circuit
PowerWise
®
is a registered trademark of National Semiconductor Corporation.
301037
LM21215
Features
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Applications
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Integrated 7.0 mΩ high side and 4.3 mΩ low side FET
switches
Adjustable current limit
Adjustable output voltage from 0.6V to V
cycle capable), ±1% reference
Input voltage range 2.95V to 5.5V
500 kHz fixed switching frequency
Startup into pre-biased loads
Output voltage tracking capability
Wide bandwidth voltage loop error amplifier
Adjustable soft-start with external capacitor
Precision enable pin with hysteresis
Integrated OVP, OTP, UVLO and Power-Good
Thermally Enhanced eTSSOP-20 exposed pad package
Broadband, networking and wireless communications
High-performance FPGAs, ASICs and microprocessors
Simple to design, high efficiency point of load regulation
from a 5V or 3.3V bus
February 24, 2011
IN
30103701
(100% duty
www.national.com