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LM5163DDAR

100V 0.5A sync buck, 10.5uA IQ, integrated FETs, Fly-Buck, SO-8 PowerPAD

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Manufacturer Part：

LM5163DDAR

Package：

SO PowerPAD-8 / DDA (4.9 x 6 mm)

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Description

Product Overview

The LM5163DDAR from Texas Instruments is a 100V input, 0.5A synchronous buck DC/DC converter with ultra-low IQ in an SO PowerPAD-8 package. Featuring integrated high-side and low-side MOSFETs, constant on-time control, and 10.5uA no-load quiescent current, it supports both buck and Fly-Buck isolated topologies for industrial and automotive applications.

Key Specifications

Input Voltage Range 6 V to 100 V
Output Current 0.5 A
Integrated MOSFETs 0.725 Ohm HS + 0.34 Ohm LS
Switching Frequency 75 kHz to 1 MHz (adjustable)
No-Load Quiescent Current 10.5 uA (typical)
Shutdown Current 3 uA
Max Duty Cycle 99%
Soft Start 3 ms fixed
Package SO PowerPAD-8 (DDA) (4.9 x 6 mm)
Operating Temperature -40 to +150 C (Tj)

Features

  • Wide 6V to 100V input range for automotive and industrial power systems
  • Integrated 0.725 Ohm high-side and 0.34 Ohm low-side MOSFETs
  • Ultra-low 10.5uA no-load input quiescent current
  • Fly-Buck topology supports isolated output with coupled inductor
  • Constant on-time (COT) control with no loop compensation needed
  • Peak and valley current limit protection with foldback

Applications

  • Industrial 24V/48V DC-DC buck converters
  • Automotive 48V mild hybrid ECU bias supplies
  • Isolated bias supplies using Fly-Buck topology
  • Telecom 48V bus converters
  • Building automation power supplies

The LM5163DDAR from Texas Instruments is a 100V, 0.5A synchronous step-down DC-DC converter with integrated high-side and low-side N-channel MOSFETs. Operating from a wide 6V to 100V input range, it achieves up to 92% efficiency with ultra-low 10.5uA no-load quiescent current. The device supports both standard buck and Fly-Buck isolated topologies, enabling designers to create isolated output rails using a coupled inductor without optocoupler feedback. The constant on-time (COT) control architecture eliminates loop compensation components and provides excellent load and line transient response.

The LM5163DDAR operates using constant on-time (COT) control architecture. (1) The high-side MOSFET is turned on for a fixed on-time determined by the RON resistor and VIN/VOUT ratio. When the on-time expires, the high-side FET turns off and the low-side synchronous FET turns on. The next switching cycle is initiated when the FB pin drops below the internal reference, maintaining output regulation. (2) The COT control provides nearly constant switching frequency without a clock, and the emulated current mode ensures stability with low-ESR ceramic output capacitors. (3) For isolated Fly-Buck operation, the coupled inductor secondary winding generates an isolated output that tracks the primary output voltage, eliminating the need for optocoupler feedback. (4) Peak current limit (0.75A typical) and valley current limit (0.6A) with foldback protect the device during overload and short-circuit conditions.

Pin Name Function
1 GND Ground
2 VIN Input supply (6-100V)
3 EN/UVLO Enable / undervoltage lockout
4 RON On-time programming resistor
5 FB Feedback input
6 PGOOD Power good indicator (open-drain)
7 BST Bootstrap capacitor
8 SW Switch node (inductor)
Pad GND Exposed thermal pad (GND)
  • Industrial 24V/48V to 5V/3.3V buck converter for PLC and factory automation
  • Automotive 48V mild hybrid ECU bias supply with ultra-low IQ standby
  • Isolated bias supply for IGBT/SiC gate drivers using Fly-Buck topology
  • Telecom 48V bus converter for RF and baseband circuits
  • Building automation and HVAC controller power supplies
Model Manufacturer Key Difference
LM5164DDAR TI 150V input, 0.3A
LM5161DDAR TI 100V, 1A, higher current
LM5022MM TI 100V controller, external FET
LTM8074 Analog Devices 40V, 1.2A uModule
MAX17690 Maxim 100V no-opto isolated flyback
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Tel / WhatsApp: +86 13760382860

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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