Datasheet LTC7130 (Analog Devices)

LTC7130 20V 20A Monolithic Buck Converter with Ultralow DCR Sensing
FEATURES DESCRIPTION
n
Wide VIN Range: 4.5V to 20V
The LTC®7130 is a current mode synchronous step-down n
Optimized for Low Duty Cycle Applications
monolithic converter that can deliver up to 20A continuous n
High Efficiency: Up to 95%
load current. It employs a unique architecture which enhances n
LTC Proprietary Current Mode Architecture
the signal-to-noise ratio of the current sense signal, allow- n
High Current Parallel Operation
ing the use of a very low DC resistance power inductor to n
Ultralow DCR Current Sensing with
maximize efficiency in high current applications. This feature
Temperature Compensation
also reduces the switching jitter commonly found in low n
Programmable Output Current Limit
DCR applications. The LTC7130 also includes a high speed n High Speed Differential Remote Sense Amplifier differential remote sense amplifier and a programmable cur- n ±0.5% Output Voltage Regulation Accuracy rent sense limit that can be selected from 10mV to 30mV to n Output Short-Circuit Protection with Soft Recovery set the output current limit up to 20A. In addition, the DCR n Programmable Soft-Start, Tracking temperature compensation feature limits the maximum n Programmable Fixed Frequency: 250kHz to 770kHz output current precisely over temperature. n EXTVCC for Reduced Power Dissipation The LTC7130 also features a precise 0.6V reference with a n Fault Indicator for Output UV/OV Conditions guaranteed limit of ±0.5% that provides an accurate output n 6.25mm × 7.5mm × 2.22mm BGA Package voltage. A 5V to 20V input voltage range supports a wide variety of bus voltages and various types of batteries.
APPLICATIONS
The LTC7130 is offered in a compact and low profile BGA pack- age available with SnPb/RoHS compliant terminal finishes. n DSP, FPGA, ASIC Reference Designs n Telecom/Datacom Systems L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, μModule, Linear Technology and the Linear logo are registered trademarks and No RSENSE is a trademark of Analog Devices, Inc. All other trademarks n Distributed High Power Density Systems are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6177787, 6580258, 6498466, 6611131, patent pending.
TYPICAL APPLICATION High Efficiency, 1.5V/20A Step-Down Converter with Very Low DCR Sensing Efficiency vs Load Current
2.2Ω 100 14 VIN = 5V + 1µF 4.7µF TO 20V CMDSH2-3 90 470µF EFFICIENCY 12 80 INTVCC SVIN INTVCC ITEMP 0.25µH 2.2Ω V 3.01k IN BOOST (0.37mΩ 70 10 POWER LOSS (W) PINS NOT USED 0.1µF DCR) VOUT 60 ILIM IN THIS CIRCUIT: SW 1.5V 8 PGOOD 1k RUN 20A 50 3.09k CLKOUT SNSD+ + V MODE/PLLIN 470µF IN = 12V 40 6 V 220nF ×2 EFFICIENCY (%) OUT = 1.5V ITH LTC7130 30 L = 0.25μH (DCR = 0.37mΩ) SNS– 4 220pF EXTVCC = 5V 220nF 20 CCM 1nF TK/SS SNSA+ 2 0.1µF 619Ω 10 POWER LOSS 20k EXTVCC DIFFP 0 0 VFB DIFFN 0 2 4 6 8 10 12 14 16 18 20 121k LOAD CURRENT (A) 20k 30.1k DIFFOUT SGND GND FREQ 7130 TA01b 7130 TA01a 7130fb For more information www.linear.com/LTC7130 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Application Related Parts .34579 Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Typical Application Related Parts