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LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator

LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator
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LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator - 1

LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator FEATURES Complete Low EMI Switch Mode Power Supply nn EN55022 Class B Compliant nn Wide Input Voltage Range: 3.6V to 58V nn Up to 4A Output Current nn 24W Output from 12V to –24V IN OUT, PLOSS = 5W, TA = 60°C, tRISE = 60°C, 200LFM – nn Output Voltage Range: –26.5V ≤ V OUT ≤ –0.5V – nn Safe Operating Area: V + |V IN OUT | ≤ 58V nn ±1.67% Total DC Output Voltage Error Over Line, Load and Temperature (–40°C to 125°C) nn Parallel and Current Share with Multiple LTM4651s nn Constant-Frequency Current Mode Control nn Frequency Synchronization Range: 250kHz to 3MHz nn Power Good Indicator and Programmable Soft-Start nn Overcurrent/Overvoltage/Overtemperature Protection nn 15mm × 9mm × 5.01mm BGA Package The LTM®4651 is an ultralow noise, 58V, 24W DC/DC μModule® inverting topology regulator. It regulates a negative output voltage (VOUT–) from a positive input supply voltage (VIN), and is designed to meet the radiated emissions requirements of EN55022. Conducted emission requirements can be met by adding standard filter components. Included in the package are the switching controller, power MOSFETs, inductor, filters and support components. The LTM4651 can regulate VOUT– to a value between –0.5V and –26.5V, provided that its input and output voltages adhere to the safe operating area criteria of the LTM4651: VIN + |VOUT–| ≤ 58V. A switching frequency range of 250kHz to 3MHz is supported (400kHz default) and the module can synchronize to an external clock. Despite being an inverting topology regulator, no level shift circuitry is needed to interface to the LTM4651’s RUN, PGOOD or CLKIN pins; those pins are referenced to GND. The LTM4651 is offered in a 15mm × 9mm × 5.01mm BGA package with SnPb or RoHS compliant terminal finish. Avionics, Industrial Control and Test Equipment nn Video, Imaging and Instrumentation nn 48V Telecom and Network Power Supplies nn RF Systems nn L, LT, LTC, LTM, Linear Technology , the Linear logo, LTpowerCAD and μModule are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5847554, 6580258. TYPICAL APPLICATION –24V, 2.25A* Ultralow Noise** DC/DC μModule Regulator 4.7μF GNDSNS SVOUT– COMPa COMPb fSET GND PINS NOT USED IN THIS CIRCUIT: CLKIN, PGOOD, PGDFB, SW, EXTVCC TEMP+, TEMP–, NC **See Figures 5 – 8 for DC2328A Radiated Emission Performance against EN55022B limits. Output Current Capability* 4.0 3.0 2.5 VOUT– = –0.5V VOUT– = –3.3V VOUT– = –5V VOUT– = –8V VOUT– = –12V VOUT– = –15V VOUT– = –20V VOUT– = –24V *Current limit frequency-foldback activates at load currents higher than indicated curves. Continuous output current capability subject to details of application implementation. Switching frequ

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LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator - 2

absolute mnximum ratings (Note 1) (All Voltages Relative to VOUT- Unless Otherwise Indicated) Terminal Voltages % VD, SVIN, SW, PGND, GNDsns, ISETa ..-0.3V to 60V A B C D E F G H J K L BGA PACKAGE 77-PIN (15mm x 9mm x 5.01mm) Tjmax= 125°C 0jCtop = 22.4°C/W OjCbottom = 7.9°C/W 0jB = 9.6°C/W 0jA = 20.8°C/W 0 VALUES DETERMINED PER jESD51-12 WEIGHT = 1.8 GRAMS ORDER INFORMATION http://www.linear.com/product/LTM4651#orderinfo PART NUMBER • Device temperature grade is indicated by a label on the shipping container. • Pad or ball finish code is per IPC/jEDEC j-STD-609. • Terminal Finish Part...

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LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator - 5

Input Voltage Regulation Pin Note 1: Stresses beyond those listing under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating conditions for extended periods may affect device reliability and lifetime. Note 2: The LTM4651 is tested under pulsed load conditions such that Tj « Ta. The LTM4651E is guaranteed to meet performance specifications over the 0°C to 125°C internal operating temperature range. Specifications over the full -40°C to 125°C internal operating temperature range are assured by design, characterization and correlation with...

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LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator - 6

LTM4651 TYPICAL PERFORMANCE CHARACTERISTICS –3.3V Efficiency vs Load Current 95 –5V Efficiency vs Load Current 95 TA = 25°C, unless otherwise noted. –12V Efficiency vs Load Current –15V Efficiency vs Load Current 95 –24V Efficiency vs Load Current Rated Operating Output Voltage –5 OUTPUT VOLTAGE (V) SAFE OPERATING AREA

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LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator - 7

LTM4651 TYPICAL PERFORMANCE CHARACTERISTICS –5V Transient Response, 24VIN TA = 25°C, unless otherwise noted. FIGURE 32 CIRCUIT, 0.625A TO 1.25A LOAD STEP AT 0.625A/μs FIGURE 32 CIRCUIT, 24VIN, , CINOUT = CIN = CDGND = CD = 4.7μF COUT = 47μF ×2, RfSET = 665kΩ, RISET = 100kΩ, RPGDFB = 36.5kΩ, REXTVCC = 20Ω, 1.8A TO 3.8A LOAD STEP AT 2A/μs FIGURE 32 CIRCUIT, APPLICATION OF 12VIN, START-UP INTO NO LOAD Start-Up, Pre-Bias FIGURE 32 CIRCUIT, APPLICATION OF 12VIN, START-UP INTO 19.2Ω LOAD FIGURE 32 CIRCUIT, VOUT– PRE-BIASED TO –5V THROUGH A 1N4148 DIODE PRIOR TO RUN TOGGLING HIGH Short Circuit, No...

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LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator - 8

LTM4651 PIN FUNCTIONS PACKAGE ROW AND COLUMN LABELING MAY VARY AMONG µModule PRODUCTS. REVIEW EACH PACKAGE LAYOUT CAREFULLY . VIN (A1 – A3, B3): Power Input Pins. Apply input voltage and input decoupling capacitance directly between VIN and a power ground (PGND) plane. VD (A4, B4, C4): Drain of the Converter’s Primary Switching MOSFET. Apply at least one 4.7μF high frequency ceramic decoupling capacitor directly from VD to VOUT–. Give this capacitor higher layout priority (closer proximity to the module) than any VIN decoupling capacitors. SVIN (C3): Input Voltage Supply for Small-Signal...

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