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LM5160XDNTT

65V 2A sync buck/Fly-Buck, integrated FETs, COT control, no compensation, 50k-1MHz, 4x4mm WSON-12

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Manufacturer Part：

LM5160XDNTT

Package：

12-pin WSON (4.0 x 4.0 x 0.8mm)

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Description

Product Overview

The LM5160XDNTT is a 65V, 2A synchronous step-down (buck) and Fly-Buck converter from Texas Instruments with integrated high-side and low-side MOSFETs. Using adaptive constant on-time (COT) control, it requires no external loop compensation and delivers fast transient response. The 4.5V to 65V input range, 2A output, and selectable DCM/FPWM modes make it ideal for industrial, telecom, and isolated Fly-Buck power supply designs in a compact 12-pin WSON (4x4mm) package.

Key Specifications

Topology Synchronous Buck / Fly-Buck
Input Voltage 4.5V to 65V
Output Voltage 2V to 60V (adjustable)
Output Current 2A maximum
Switch Current Limit 2.5A (typical)
Switching Frequency 50kHz to 1MHz (resistor programmable)
Control Mode Adaptive Constant On-Time (COT)
Duty Cycle Up to 92%
Feedback Voltage Accuracy ±1% over temperature
Integrated MOSFETs High-side + Low-side (synchronous)
External Schottky Required No
FPWM/DCM Selection Yes (pin selectable)
Soft Start Programmable (external capacitor)
UVLO Adjustable with hysteresis
Package 12-pin WSON (4 x 4mm)
Operating Temperature -40°C to +125°C

Features

  • 4.5V to 65V wide input voltage range
  • Integrated high-side and low-side MOSFETs — no external Schottky
  • 2A maximum load current with 2.5A current limit
  • Adaptive COT control — no external loop compensation needed
  • Fast transient response with high step-down ratios
  • Selectable forced PWM (FPWM) or DCM operation
  • FPWM mode supports multi-output Fly-Buck isolated topologies
  • Resistor-adjustable switching frequency up to 1MHz
  • Programmable soft start with pre-biased startup
  • ±1% feedback voltage reference accuracy
  • Adjustable input UVLO with hysteresis
  • Thermal shutdown with hysteresis
  • Peak and valley current limit protection

Applications

  • Industrial PLC and I/O module power
  • IGBT gate driver isolated bias supplies (Fly-Buck)
  • Telecom primary and secondary side power
  • Smart meter power line communication supplies
  • Low-power isolated DC/DC converters
  • Automotive and battery-powered systems

The LM5160XDNTT is a 65V, 2A synchronous buck/Fly-Buck DC/DC converter from Texas Instruments with both high-side and low-side MOSFETs integrated on-chip, eliminating the need for an external Schottky diode. The adaptive constant on-time (COT) control scheme requires no external loop compensation while delivering fast transient response and supporting high step-down ratios. The switching frequency is resistor-programmable from 50kHz to 1MHz. The FPWM pin selects between forced continuous conduction mode (for multi-output Fly-Buck isolated topologies) and DCM mode (for high light-load efficiency). The ±1% feedback reference ensures tight output regulation over the full -40°C to +125°C temperature range. Protection features include peak/valley current limiting, adjustable UVLO, and thermal shutdown.

The LM5160 uses an adaptive constant on-time (COT) control scheme. When the FB pin voltage falls below the reference, the high-side MOSFET turns on for a pre-calculated on-time that is inversely proportional to VIN, resulting in a nearly constant switching frequency. After the on-time, the high-side FET turns off and the low-side synchronous FET turns on until the inductor current decays to the valley current limit threshold or the FB voltage rises above the reference. A transconductance error amplifier minimizes the steady-state DC error between the average FB voltage and the internal reference, providing ±1% regulation accuracy without the Type-II/III compensation networks required by voltage-mode controllers. In FPWM mode, the low-side FET is kept on even at zero load (allowing negative inductor current), which is essential for Fly-Buck topologies where the coupled inductor secondary must always have a well-defined magnetizing current waveform. In DCM mode, the low-side FET turns off when the inductor current reaches zero, preventing negative current and improving light-load efficiency.

Pin Name Description
1 VIN Input supply (4.5V to 65V)
2 EN/UVLO Enable / UVLO adjust (external resistor divider)
3 RON On-time programming resistor (to VIN)
4 FB Feedback voltage (connect to output divider)
5 VCC Internal 5V LDO output (bypass with cap)
6 SS Soft start programming (external cap)
7 FPWM Mode select: high=FPWM, float/low=DCM
8 GND Signal ground
9 SW Switch node (connect to inductor)
10 BOOT Bootstrap cap (to SW)
11 PGND Power ground
12 PGND Power ground
Pad PGND Exposed thermal pad (connect to GND plane)
  • Isolated IGBT Gate Driver Bias (Fly-Buck): Use the LM5160 in Fly-Buck topology to generate +15V/-5V isolated bias supplies for IGBT gate drivers. The 65V input accepts the DC bus voltage directly. A coupled inductor provides isolation while the FPWM mode ensures continuous magnetizing current for regulated isolated outputs. No optocoupler is needed since the primary-side output regulates the isolated secondary.
  • Industrial PLC I/O Module Power: Convert 24V bus to 5V/2A for a PLC analog I/O module. The COT control’s fast transient response handles the I/O module’s pulsed current loads without large output capacitors. The 1MHz switching frequency allows a small 4.7µH inductor, minimizing module height. The ±1% output accuracy meets PLC voltage regulation requirements.
  • Telecom 48V to 12V Intermediate Bus: Convert a 48V telecom bus (36V-72V range) to 12V intermediate bus at up to 2A. The 65V maximum input accommodates the 72V peak. In DCM mode, efficiency at light load exceeds 85%, reducing power waste in standby. The integrated MOSFETs simplify the BOM compared to controller+external-FET solutions.
Model Vin Max Iout Control Key Difference
LM5160ADNTT 65V 2A COT External VCC bias option for high Vin efficiency
LM5012 100V 2.5A COT Higher Vin, non-synchronous
LM5161 65V 1A COT Lower current, smaller solution
TPS54160 60V 1.5A Current Mode TI, lower Vin, requires compensation
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