Datasheet LTM4651 (Analog Devices)

LTM4651 EN55022B Compliant 58V, 24W Inverting-Output DC/DC μModule Regulator
FEATURES DESCRIPTION
n
Complete Low EMI Switch Mode Power Supply
The LTM®4651 is an ultralow noise, 58V, 24W DC/DC n
EN55022 Class B Compliant
μModule® inverting topology regulator. It regulates a nega- n
Wide Input Voltage Range: 3.6V to 58V
tive output voltage (V – OUT ) from a positive input supply n
Up to 4A Output Current
voltage (VIN), and is designed to meet the radiated emissions n
24W Output from 12VIN to –24VOUT, PLOSS = 5W,
requirements of EN55022. Conducted emission require-
TA = 60°C, tRISE = 60°C, 200LFM
ments can be met by adding standard filter components.
–
n
Output Voltage Range: –26.5V ≤ VOUT ≤
–
0.5V
Included in the package are the switching controller, power
–
n
Safe Operating Area: VIN + |VOUT | ≤ 58V
MOSFETs, inductor, filters and support components. n
±1.67% Total DC Output Voltage Error Over Line,
The LTM4651 can regulate V – OUT to a value between
Load and Temperature (–40°C to 125°C)
–0.5V and –26.5V, provided that its input and output n
Parallel and Current Share with Multiple LTM4651s
voltages adhere to the safe operating area criteria of the n Constant-Frequency Current Mode Control LTM4651: V – IN + |VOUT |
≤
58V. A switching frequency n Frequency Synchronization Range: 250kHz to 3MHz range of 250kHz to 3MHz is supported (400kHz default) n Power Good Indicator and Programmable Soft-Start and the module can synchronize to an external clock. n Overcurrent/Overvoltage/Overtemperature Protection n 15mm × 9mm × 5.01mm BGA Package 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.
APPLICATIONS
n The LTM4651 is offered in a 15mm × 9mm × 5.01mm BGA Avionics, Industrial Control and Test Equipment n package with SnPb or RoHS compliant terminal finish. Video, Imaging and Instrumentation n 48V Telecom and Network Power Supplies All registered trademarks and trademarks are the property of their respective owners. n RF Systems
TYPICAL APPLICATION –24V, 2.25A* Ultralow Noise** DC/DC μModule Regulator Output Current Capability*
4.0 VIN VIN PGND 3.6V 4.7μF 3.5 TO 34V SVIN GNDSNS V 10µF 3.0 D LOAD ×2 RUN SV – OUT 2.5 4.7μF INTVCC V – –24V OUT OUT, – LTM4651 2.0 UP TO 2.25A VOUT = –0.5V – VINREG VOUT = –3.3V 1.5 V – OUT = –5V COMPa – OUTPUT CURRENT (A) VOUT = –8V 1.0 V – OUT = –12V COMPb V – OUT = –15V
PINS NOT USED IN
0.5 V – = –20V f OUT SET
THIS CIRCUIT:
V – OUT = –24V CLKIN, PGOOD, GND ISETa ISETb 0 0 10 20 30 40 50 60 4651 TA01a PGDFB, SW, EXTVCC TEMP+, TEMP–, NC 90.9k INPUT VOLTAGE (V) 4651 TA01b 481k *Current limit frequency-foldback activates at load currents higher than indicated curves. Continuous output current capability subject to details of application **See Figures 5 – 8 for DC2328A Radiated Emission Performance against EN55022B limits. implementation. Switching frequency set per Table 1. See Notes 2 and 3. Rev. A Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Test Circuit Decoupling Requirements Operation Applications Information Typical Applications Package Photograph Package Description Typical Application Related Parts