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LM5085QMYE/NOPB

75V PFET buck controller, 4.5-75V in, adj from 1.25V, 1MHz, AEC-Q100, HVSSOP-8

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Pieza del fabricante：

LM5085QMYE/NOPB

Paquete：

HVSSOP-8 (3.0 x 3.0 x 0.95 mm)

Marca：
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Compromiso de calidad
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Descripción

Productos

The LM5085QMYE/NOPB from Texas Instruments is an automotive-grade 75V PFET buck switching regulator controller with constant on-time control. It operates from 4.5V to 75V input, requires no loop compensation, and supports 100% duty cycle in an HVSSOP-8 package.

Especificaciones

Topology Non-synchronous PFET Buck Controller
Input Voltage Range 4.5V to 75V
Output Voltage Adjustable from 1.25V
Switching Frequency Up to 1MHz (programmable)
Reference Accuracy +/-2%
Duty Cycle Up to 100%
Temperatura de funcionamiento -40 to 125 C
Cualificación AEC-Q100 Grade 1

Características

  • Wide 4.5V to 75V input voltage range
  • No loop compensation required
  • Ultra-fast transient response
  • Programmable switching frequency up to 1MHz
  • Adjustable current limit using RDS(ON) or sense resistor
  • 100% duty cycle capable for low dropout
  • Internal soft-start timer
  • AEC-Q100 Grade 1 qualified

Aplicaciones

  • Automotive infotainment power supply
  • Battery and super-capacitor chargers
  • LED driver power regulation
  • Industrial distributed power systems
  • Telecom power regulation

The LM5085QMYE/NOPB from Texas Instruments is an automotive-grade high-efficiency PFET switching regulator controller designed for buck converter applications with wide input voltage ranges. Operating from 4.5V to 75V, it uses a constant on-time regulation principle that eliminates the need for loop compensation and results in ultra-fast load transient response. The PFET architecture allows 100% duty cycle operation for low dropout voltage conditions. Current limiting can be implemented using either the RDS(ON) of the external PFET or an external sense resistor. The device features an internal soft-start timer, an integrated high-voltage bias regulator, and thermal shutdown protection. AEC-Q100 Grade 1 qualified, the LM5085QMYE/NOPB is suitable for demanding automotive applications operating over the -40 to 125 C temperature range.

The LM5085QMYE/NOPB operates using a constant on-time (COT) control scheme. Key subsystems include: (1) On-Time Timer – generates a fixed on-time pulse inversely proportional to the input voltage, maintaining nearly constant switching frequency; (2) Comparator-Based Control – the output voltage is compared to a precision +/-2% reference via a feedback comparator, triggering an on-time pulse when the output falls below the set point; (3) PFET Gate Driver – drives an external P-channel MOSFET with adequate gate charge for switching at up to 1MHz; (4) High-Voltage Bias Regulator – generates the internal low-voltage supply from the high-voltage input; (5) Current Limit – monitors the voltage across the external PFET or sense resistor and terminates the on-time pulse if the current threshold is exceeded; (6) Soft-Start – an internal timer ramps up the current limit at startup to reduce inrush current.

Pin Nombre Tipo Función
1 VIN Entrada Input voltage supply (4.5V to 75V)
2 FB Entrada Feedback input from output voltage divider
3 ISENSE Entrada Current sense input for overcurrent detection
4 RT Entrada Timing resistor input for on-time programming
5 SGND Suelo Signal ground
6 PGATE Salida PFET gate driver output
7 VCC Salida Internal bias regulator output (bypass with capacitor)
8 PGND Suelo Power ground
  • Automotive battery-powered step-down converters for infotainment and ADAS
  • Industrial 24V/48V distributed power regulation
  • High-voltage LED driver power supplies
  • Battery and super-capacitor charging systems
  • Telecom and networking equipment power
Fabricante Número de pieza Paquete Notas
Texas Instruments LM5085MYE/NOPB HVSSOP-8 Non-automotive grade
Texas Instruments LM5088MYE/NOPB WSON-8 75V NFET buck controller
Monolithic Power MP9486GJ-Z SOP-8 75V buck, internal switch
Dispositivos analógicos LTC3643EMSE#PBF MSOP-10 60V, synchronous buck
ON Semiconductor NCP1034DR2G SOIC-8 100V, current mode
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