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LMZ31520RLGT

20A Power Module, 3-14.5Vin, 0.6-3.6Vout, 96%, BQFN-72

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Pieza del fabricante：

LMZ31520RLGT

Paquete：

B4QFN-72 (15.0 x 16.0 x 5.8 mm, 1.0mm pitch, exposed pad)

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Descripción

Productos

The LMZ31520RLGT from Texas Instruments is a 20A SIMPLE SWITCHER power module with 3-14.5V input, 0.6-3.6V output, 96% efficiency, D-CAP mode, and 15x16x5.8mm BQFN package.

Especificaciones

Tipo 20A Integrated Power Module (Buck Regulator)
Input Voltage 3V to 14.5V
Output Voltage 0.6V to 3.6V (adjustable, 1% accuracy)
Corriente de salida 20A (max continuous)
Efficiency Up to 96%
Control Mode D-CAP
Switching Frequency 300 kHz to 850 kHz (selectable)
Thermal Impedance 8.6 C/W (Rth JA)
Características Power good, remote sense, enable, OCP, OTP
Paquete B4QFN-72 (RLG, 15 x 16 x 5.8mm)
Temperatura de funcionamiento -40C to +85C

Características

  • Complete integrated power solution with inductor and passives
  • 20A output in 15x16x5.8mm package
  • 96% peak efficiency
  • Pin-compatible with LMZ31530 (30A)
  • D-CAP mode ultra-fast transient response
  • Remote sense for precision regulation
  • Selectable switching frequency and slow-start
  • Meets EN55022 Class A EMI

Aplicaciones

  • FPGA core and I/O power
  • Server point-of-load
  • Telecom/datacom POL
  • ASIC and processor power

The LMZ31520RLGT from Texas Instruments is a complete 20A integrated power module in a 15x16x5.8mm B4QFN-72 package that combines a DC/DC buck regulator with integrated power MOSFETs, a shielded inductor, and passive components into a single surface-mount module. The RLG suffix denotes the 72-pin B4QFN package, and T indicates tape and reel. The module requires as few as three external components (input capacitor, output capacitor, and VADJ resistor) to implement a complete 20A point-of-load power supply. The 3V to 14.5V input range supports common bus voltages (3.3V, 5V, 12V), while the 0.6V to 3.6V adjustable output with 1% reference accuracy covers FPGA core, I/O, and DSP power requirements. The 96% peak efficiency at 12V input and 3.3V output minimizes thermal design challenges. The D-CAP control mode provides ultra-fast load step response without requiring external compensation, simplifying design. The 8.6C/W thermal impedance (junction-to-ambient on a standard PCB) allows the module to dissipate up to 5W at 85C ambient without forced air. The module meets EN55022 Class A EMI emissions with the integrated shielded inductor, eliminating external EMI filtering.

The LMZ31520RLGT is a complete synchronous buck regulator integrated into a single module. The power stage consists of high-side and low-side N-channel MOSFETs controlled by the D-CAP mode controller, and a shielded power inductor. The D-CAP mode uses adaptive on-time control where the on-time duration is calculated from the input-output voltage ratio to maintain a pseudo-constant switching frequency. When the output voltage drops below the reference, the controller triggers an on-time pulse. The integrated shielded inductor stores energy during the on-time and delivers it to the output during the off-time. The remote sense pins (SENSE+ and AGND) connect directly at the load, compensating for PCB trace resistance and ensuring accurate voltage regulation at the point of load. The VADJ pin with an external resistor to AGND sets the output voltage through the internal 0.6V reference and feedback divider. The selectable switching frequency (300-850kHz) is set by the FREQ_SEL pin, allowing designers to trade off efficiency (lower frequency) against solution size (higher frequency). The module’s integrated passive components (bootstrap capacitor, V5V bypass, and compensation) are factory-optimized for the D-CAP mode, eliminating the need for any loop compensation design.

Grupo Pin Nombre Tipo Función
Entrada de alimentación VIN, PVIN Potencia Input supply (3-14.5V)
Potencia de salida VOUT Salida Regulated output (0.6-3.6V, 20A)
Potencia PGND, AGND Potencia Power and analog ground
Controlar INH Entrada Inhibit (enable, active-high)
Controlar VADJ Entrada Output voltage adjust resistor
Controlar SENSE+ Entrada Remote sense positive
Controlar SS_SEL Entrada Slow-start and mode select
Controlar FREQ_SEL Entrada Switching frequency select
Controlar PWRGD Salida Power good (open-drain)
Bias V5V Salida Internal 5V LDO output
  • 12V to 1.0V FPGA core power at 20A with LMZ31520 requiring only 3 external components, 96% efficiency, and 8.6C/W thermal impedance for 85C ambient operation
  • 5V to 3.3V telecom POL at 20A with remote sense for 1% regulation at the load and 500kHz switching for low ripple
  • 12V to 1.8V server ASIC power with PWRGD output for power sequencing and adjustable OCL for inrush current management
Fabricante Número de pieza Paquete Notas
TI LMZ31530RLGT B4QFN-72 30A, pin-compatible upgrade
TI LMZ31503RLGT B4QFN-72 3A, smaller version
TI LMZM33606RLGT B3QFN-36 6A, smaller module
Vicor PI2121-A00 VIA-PFM 50A, higher power module
Delta ISM020A-12V3R3 SMD 20A, 12V-3.3V module
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