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LM5119PSQX/NOPB

Dual 5 A sync buck controller, 3–100 V input, emulated current mode, 20-WQFN, automotive

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Manufacturer Part：

LM5119PSQX/NOPB

Package：

20-WQFN (SQP) — 4.0 x 4.0 mm

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Description

Product Overview

The LM5119PSQX/NOPB is a dual 5 A, current mode synchronous buck controller from Texas Instruments. Packaged in a 20-pin WQFN (SQP), it operates from an input range of 3 V to 100 V, making it ideal for high-voltage industrial and automotive power conversion. The device features emulated current mode control, adjustable switching frequency up to 1 MHz, and independent enable and soft-start for each channel.

Key Specifications

Topology Dual Synchronous Buck Controller
Input Voltage Range 3 V to 100 V
Output Current 5 A per channel (external MOSFETs)
Switching Frequency 50 kHz to 1 MHz (adjustable)
Control Mode Emulated Current Mode
Package 20-WQFN (SQP) — 4.0 x 4.0 mm
Operating Temperature -40°C to +125°C
Duty Cycle Up to 95%

Features

  • Wide 3-V to 100-V input voltage range for industrial and automotive systems
  • Emulated current mode control with cycle-by-cycle current limit
  • Dual output with 180° out-of-phase operation for reduced input capacitance
  • Independent enable, soft-start, and current limit for each channel
  • Synchronization input for multi-chip phase interleaving

Applications

  • Industrial 24 V and 48 V power distribution
  • Automotive battery-powered DC-DC conversion
  • FPGA and DSP core and I/O power supplies
  • Telecom and networking equipment power
  • Motor drive and LED lighting power supplies

The LM5119 is a dual synchronous buck controller from Texas Instruments designed for high-voltage industrial and automotive power conversion applications. It operates from an input voltage range of 3 V to 100 V, driving external N-channel MOSFETs for each output channel. The emulated current mode control provides excellent transient response and cycle-by-cycle current limiting without the need for external current sense resistors. The two outputs operate 180° out of phase to minimize input ripple current and reduce input capacitor requirements. Independent enable, soft-start, and current limit functions allow flexible power sequencing.

The LM5119 uses an emulated current mode control architecture that reconstructs the inductor current ramp internally, eliminating the need for external current sensing networks. The high-side MOSFET current is sensed through its RDS(on) or an external sense resistor, and the current information is used for both regulation and cycle-by-cycle current limiting. The error amplifier compares the output voltage feedback against a precision reference (0.8 V) and generates a control signal for the PWM comparator. The two channels operate 180° out of phase, effectively doubling the input ripple frequency and reducing the required input capacitance. An internal VCC regulator provides bias from the high-voltage input.

Pin Name Type Function
1 VIN Input Input supply voltage (3–100 V)
2 VCC Output Internal regulator output (bypass with cap)
3 EN1 Input Channel 1 enable
4 SS1 I/O Channel 1 soft-start (cap to GND)
5 FB1 Input Channel 1 output voltage feedback
6 COMP1 I/O Channel 1 error amplifier output
7 CS1 Input Channel 1 current sense input
8 AGND Power Analog ground
9 CS2 Input Channel 2 current sense input
10 COMP2 I/O Channel 2 error amplifier output
11 FB2 Input Channel 2 output voltage feedback
12 SS2 I/O Channel 2 soft-start (cap to GND)
13 EN2 Input Channel 2 enable
14 SYNC Input Frequency synchronization input
15 RT I/O Frequency set resistor to GND
16 HO2 Output Channel 2 high-side gate drive
17 SW2 I/O Channel 2 switch node
18 LO2 Output Channel 2 low-side gate drive
19 PGND Power Power ground
20 LO1 Output Channel 1 low-side gate drive
  • 24 V / 48 V industrial bus to logic power conversion
  • Automotive 12 V / 48 V battery to point-of-load supplies
  • Dual-output FPGA core and I/O voltage generation
  • Telecom base station power distribution modules
  • Broad-input-range DC-DC converters for LED driver front-ends
Manufacturer Part Number Package Notes
TI LM5141RHBR 28-TSSOP Single 100 V sync buck controller
TI LM5143SQE/NOPB 28-WQFN Dual 100 V controller, higher integration
Analog Devices LT8653S 28-SSOP Dual 4 A, 42 V monolithic buck
Monolithic Power MP3910GS-P 28-QSOP Dual 60 V buck controller
Infineon IR3651STRPBF 28-TSSOP Dual 60 V buck controller
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Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

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Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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