Datasheet LT8653S (Analog Devices)

LT8653S Dual Channel 2A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current
FEATURES DESCRIPTION
n Silent Switcher®2 Architecture: The LT®8653S is a dual step-down regulator that n Ultralow EMI on Any PCB delivers up to 2A of continuous current from both n Eliminates PCB Layout Sensitivity channels and supports loads up to 3A from each n Internal Bypass Capacitors Reduce Radiated EMI channel. The LT8653S features the second generation n Optional Spread Spectrum Modulation Silent Switcher architecture to minimize EMI emissions n 2A DC from Each Channel Simultaneously while delivering high efficiency at high switching n Up to 3A on Either Channel frequencies. This includes integration of bypass n Ultralow Quiescent Current Burst Mode® Operation: capacitors to optimize high frequency current loops and n 6.2μA IQ Regulating 12VIN to 5VOUT1 and 3.3VOUT2 make it easy to achieve advertised EMI performance by n Output Ripple < 10mVP–P eliminating layout sensitivity. n Optional External VC Pin: Fast Transient Response The fast, clean, low overshoot switching edges enable n Forced Continuous Mode high efficiency operation even at high switching n High Efficiency at High Frequency frequencies, leading to a small solution size with wide n 94.1% Efficiency at 1A, 5VOUT from 12VIN at 2MHz control loop bandwidth for fast transient response. n Pin-Selectable Fixed Output Voltages: 5V, 3.3V, 1.8V Burst Mode operation enables ultralow standby current n Fast Minimum Switch-On Time: 30ns consumption or forced continuous mode can be used to n Wide Input Voltage Range: 3.0V to 42V control frequency harmonics across the entire output n Adjustable and Synchronizable: 300kHz to 3MHz load range. The LT8653S is a full featured, customizable n Fixed Output Pin Strap Options voltage regulator, but also has several pin strap options n Internal 2MHz fSW with Fast Internal Compensation to select internal 2MHz switching frequency, internal n Small 4mm × 3mm 20-Pin LQFN Package compensation and internal feedback resistor divider n AEC-Q100 Automotive Qualification in Progress options to create a simple, compact two output voltage
APPLICATIONS
regulator with only five external components. All registered trademarks and trademarks are the property of their respective owners. n General Purpose Step-Down n Automotive and Industrial Supplies
TYPICAL APPLICATION Efficiency
100
5V/2A, 3.3V/2A 2MHz Step-Down Converter
95 90 VIN V D0 85 IN 5.6V TO 42V 4.7µF EN/UV D1 80 VOUT1 2.2µH 2.2µH V 75 OUT2 5V SW1 SW2 3.3V 70 2A 47µF FB1 LT8653S FB2 100µF 2A 65 BIAS EFFICIENCY (%) 60 VC2 55 VC1 50 RT VCC GND SYNC VIN = 12V 5VOUT 45 fSW = 2MHz 3.3VOUT 40 fSW = 2MHz 8653S TA01a 0 0.5 1 1.5 2 2.5 3 LOAD CURRENT (A) 8653S TA01b Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts