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LM3000SQ/NOPB

Dual sync buck controller, 3.3–18.5 V, 20 A/ch, emulated current mode, 32-WQFN

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Manufacturer Part：

LM3000SQ/NOPB

Package：

32-WQFN (RTV) — 5.0 x 5.0 mm

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Description

Product Overview

The LM3000SQ/NOPB is a dual synchronous buck controller from Texas Instruments with an input range of 3.3 V to 18.5 V. Packaged in a 32-pin WQFN (RTV), it uses emulated current mode control with bottom-side FET sensing for fast transient response and current limiting without external sense resistors. The two outputs operate 180° out of phase for reduced input capacitor requirements.

Key Specifications

Topology Dual Synchronous Buck Controller
Input Voltage Range 3.3 V to 18.5 V
Output Voltage Range 0.6 V to 80% of VIN
Max Output Current 20 A per channel (external MOSFETs)
Switching Frequency 200 kHz to 1.5 MHz (adjustable)
Package 32-WQFN (RTV) — 5.0 x 5.0 mm
Operating Temperature -40°C to +125°C
FB Accuracy 1%

Features

  • Emulated current mode control with bottom-side FET current sensing
  • 180° out-of-phase operation reduces input capacitance
  • Independent enable, soft-start, and track for each output
  • Remote differential output voltage sensing
  • Hiccup mode short-circuit protection

Applications

  • DC power distribution systems
  • Graphics card GPU and memory power
  • FPGA, CPLD, and ASIC core supplies
  • Embedded processor I/O supplies
  • Networking equipment routers and switches

The LM3000 is a dual output synchronous buck controller from Texas Instruments designed to convert input voltages from 3.3 V to 18.5 V down to output voltages as low as 0.6 V. The two outputs switch at a programmable frequency of 200 kHz to 1.5 MHz, with the second output 180° out of phase to minimize input filter requirements. The emulated current-mode control uses bottom-side FET sensing for fast transient response and current limit without external sense resistors. Separate enable, soft-start, and track pins allow independent control for flexible power sequencing.

The LM3000 uses an emulated current-mode control architecture that synthesizes the inductor current ramp internally. The bottom-side MOSFET RDS(on) is sensed during the off-time to reconstruct the inductor current, eliminating external sense resistors. The error amplifier compares the differential output voltage (sensed remotely) against a 0.6 V reference with 1% accuracy. The PWM comparator generates the gate drive timing. The two channels operate 180° out of phase, effectively doubling the input ripple frequency. A CLKOUT pin provides a 90° phase-shifted clock for daisy-chaining multiple LM3000 devices. Protection features include UVLO, power good, over-voltage crowbar, and hiccup mode short-circuit protection.

Pin Name Type Function
1 VDD Output Internal 5 V regulator output
2 EN1 Input Channel 1 enable
3 SS1 I/O Channel 1 soft-start capacitor
4 TRK1 Input Channel 1 tracking input
5 ILIM1 Input Channel 1 current limit set
6 FB1 Input Channel 1 feedback (diff +)
7 CMP1 I/O Channel 1 compensation
8 VIN Input Input supply (3.3–18.5 V)
9 SW1 I/O Channel 1 switch node
10 HO1 Output Channel 1 high-side gate drive
11 LO1 Output Channel 1 low-side gate drive
12 PGND1 Power Channel 1 power ground
13–16 Ch2 pins Mixed Channel 2 mirrors Ch1
17 PGOOD2 Output Channel 2 power good
18 PGOOD1 Output Channel 1 power good
  • 12 V to point-of-load conversion for GPU and memory
  • FPGA core and I/O dual-rail power generation
  • Networking equipment dual-output DC-DC conversion
  • 5 V / 12 V industrial power distribution
  • Embedded processor core and DDR supply
Manufacturer Part Number Package Notes
TI LM3150MHX/NOPB 20-HTSSOP Single sync buck controller, similar range
TI LM5141RHBR 28-TSSOP Single 100 V sync buck controller
Analog Devices LT3718EUH#PBF 32-QFN Dual step-down controller
Infineon IR3651STRPBF 28-TSSOP Dual step-down controller
Richtek RT8859MGS 32-VQFN Dual step-down 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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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

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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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