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LM21305 датащи(PDF) 1 Page - Texas Instruments

номер детали LM21305
подробное описание детали  5A Adjustable Frequency Synchronous Buck Regulator
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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LM21305 датащи(HTML) 1 Page - Texas Instruments

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0.6V - 5V
VIN
LM21305
SW
COMP
FREQ
EN
FB
PGOOD
PGND
2V5
AVIN
AGND
5V0
CBOOT
PVIN
CIN
L
RF
C5V0
C2V5
CF
Cc1
Rc
CFRQ
RFRQ
RFB1
RFB2
CBOOT
COUT
SYNC
VOUT
REN1
REN2
RPG
LM21305
www.ti.com
SNVS639F – DECEMBER 2009 – REVISED MARCH 2013
5A Adjustable Frequency Synchronous Buck Regulator
Check for Samples: LM21305
1
FEATURES
APPLICATIONS
2
High Efficiency Switcher Core With Integrated
POL Regulation From 3.3V, 5V, and 12V
Low RDSon Power MOSFETs
Supply Rails
Resistor Programmable Switching Frequency
High Efficiency Supply for DSPs, FPGAs,
With Frequency Synchronization
ASICs and Processors
Internal Soft-Start With Monotonic and Pre-
Broadband, Networking and Optical
Biased Startup
Communications Infrastructure
Low Shutdown Quiescent Current
DESCRIPTION
Precision Enable With Hysteresis
The LM21305 is a full-featured 5A synchronous buck
PGOOD Indicator Function
POL regulator optimized for solution size, flexibilty,
Input Under-Voltage Lock-Out (UVLO)
and high conversion efficiency. High power density
LM21305
designs
are
achieved
via
monolithic
Output Over-Voltage Protection (OVP)
integration of the high-side and low-side power
High-Bandwidth Load Transient Response
MOSFETs, high switching frequency, current-mode
With Peak Current-Mode Control
control, and optimized thermal design. The efficiency
Cycle-by-Cycle Current Limiting
of the LM21305 is elevated at light loads with diode
emulation mode operation and at heavy loads by
Thermal Shutdown
optimal design of the MOSFET gate drivers to
minimize
switch
dead-times
and
body-diode
KEY SPECIFICATIONS
conduction losses.
3V to 18V Single-Rail Input Voltage
The LM21305 accepts a wide input voltage range of
0.598V Feedback Voltage Reference
3V to 18V, facilitating interface to all intermediate bus
300 kHz to 1.5 MHz Switching Frequency
voltages, including 3.3V, 5V and 12V rails. An output
voltage as low as 0.598V is supported with excellent
WQFN-28 Package (5 x 5 x 0.8 mm, 0.5 mm
setpoint accuracy and low ripple and RMS noise.
Pitch)
Typical 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 © 2009–2013, 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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