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TPS51219RTER

Buck Controller, Diff Feedback, 3-28Vin, D-CAP/D-CAP2, QFN-16

8901

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Pieza del fabricante：

TPS51219RTER

Paquete：

WQFN-16 (3.0 x 3.0 x 0.8 mm, 0.5mm pitch)

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Descripción

Productos

The TPS51219RTER from Texas Instruments is a high-performance synchronous buck controller with differential voltage feedback, 3-28V input, D-CAP/D-CAP2 modes, and 3x3mm QFN-16 package.

Especificaciones

Tipo Synchronous Step-Down Controller with Differential Feedback
Input Voltage (Conversion) 3V to 28V
Supply Voltage (V5) 5V (external)
Output Voltage 0.5V to 2.0V (adjustable); 1.05V/1.0V fixed options
Corriente de salida 0A to 20A+ (external MOSFETs)
Control Mode D-CAP or D-CAP2 (selectable via MODE resistor)
Switching Frequency 300/400/500/670 kHz (mode-dependent)
Current Sensing Low-side RDS(ON) sensing (4700 ppm/C) or external resistor
Soft-Start 1ms internal voltage servo
Paquete WQFN-16 (RTE, 3 x 3 mm)
Temperatura de funcionamiento -40C to +85C

Características

  • Differential voltage feedback for precision regulation
  • DC compensation for accurate output voltage
  • D-CAP mode (300/400kHz) for fast transient response
  • D-CAP2 mode (500/670kHz) for all-ceramic capacitors
  • Low-side RDS(ON) current sensing with temperature compensation
  • External RSENSE option for accurate current sensing
  • 1ms internal voltage servo soft-start
  • Built-in output discharge
  • Power-good output
  • Integrated boost switch
  • OVP, UVP, OCP, and thermal shutdown (non-latched)
  • Skip-mode at light load for high efficiency

Aplicaciones

  • Notebook computer VCCIO supplies
  • Point-of-load power for Intel/AMD platforms
  • Low-voltage high-current POL converters
  • DDR memory power rails

The TPS51219RTER from Texas Instruments is a high-performance single synchronous step-down controller with differential voltage feedback in a tiny 3x3mm WQFN-16 package. The device features selectable D-CAP or D-CAP2 control modes via the MODE pin resistor, providing flexibility for applications requiring either fast transient response (D-CAP) or stability with low-ESR ceramic output capacitors (D-CAP2). The differential voltage feedback senses the output voltage directly at the load through dedicated VSNS/GSNS pins, eliminating IR drop errors in high-current PCB traces. The DC compensation feature corrects for the DC offset inherent in D-CAP mode, providing tight output voltage regulation. The conversion input voltage ranges from 3V to 28V, supporting a wide range of bus voltages. The output voltage is adjustable from 0.5V to 2.0V or can be set to 1.05V or 1.0V fixed options via the REFIN pin. Current sensing is implemented through low-side MOSFET RDS(ON) sensing with 4700 ppm/C temperature compensation, or an external current sense resistor for higher accuracy. The device requires an external 5V supply (V5) for the internal circuitry and gate drivers.

The TPS51219RTER uses adaptive on-time control (D-CAP or D-CAP2) to regulate the output voltage. In D-CAP mode, the controller monitors the output voltage ripple through the VSNS/GSNS differential feedback pair. When the output voltage drops below the reference threshold, the controller triggers an on-time pulse whose duration is adaptively calculated from the input and output voltage to maintain the target switching frequency. This architecture provides extremely fast transient response because there is no error amplifier compensation network limiting the control loop bandwidth. In D-CAP2 mode, an internal compensation ramp is added to the feedback signal, allowing stable operation with very low ESR ceramic output capacitors. The DC compensation circuit measures the DC difference between the output voltage and the reference, and adds a correction term to the on-time adjustment, eliminating the DC offset that naturally occurs in ripple-based control. The differential feedback uses dedicated sense lines (VSNS/GSNS) that connect directly at the load point, rejecting common-mode voltage drops in the power delivery path. The low-side RDS(ON) current sensing measures the voltage across the synchronous MOSFET during the off-time, using the 4700 ppm/C temperature coefficient to compensate for RDS(ON) variation with temperature.

Pin Nombre Tipo Función
1 V5 Potencia 5V supply for internal circuits and gate drivers
2 BST E/S Bootstrap capacitor for high-side driver
3 DH Salida High-side MOSFET gate drive
4 DL Salida Low-side MOSFET gate drive
5 PGND Potencia Power ground for gate drivers
6 TRIP Entrada Overcurrent trip level / current sense
7 COMP E/S DC compensation capacitor
8 MODO Entrada Mode/frequency selection resistor
9 VSNS Entrada Output voltage sense (differential +)
10 GSNS Entrada Output voltage sense return (differential -)
11 REFIN Entrada Reference voltage input (1.05V/1.0V/external)
12 ES Entrada Enable (HIGH=on)
13 PGOOD Salida Power-good (open-drain)
14 GND Potencia Signal ground
15 VIN Entrada Conversion input voltage (3-28V, sense only)
16 SW E/S Switch node (bootstrap return)
  • Intel notebook VCCIO 1.05V supply with differential feedback for 20A+ load regulation within 1% at the CPU die
  • 12V to 1.0V POL for FPGA core with D-CAP2 mode and all-ceramic output capacitors at 670kHz
  • 19V to 1.5V DDR3 VDDQ supply with external RSENSE for accurate current reporting and OCP
Fabricante Número de pieza Paquete Notas
TI TPS51220ARTER WQFN-16 Dual output version
TI TPS51116 WQFN-20 DDR complete solution with LDO
Monolithic Power MP2853GQET-P QFN-20 Multi-phase, more features
Infineon IR3823AMTRPBF PQFN-24 Integrated FET, similar power
TI TPS51216RUKR WQFN-20 DDR VDDQ/VTT/VREF
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