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LM43601PWPR

3.5-36V 1A synchronous buck, 33µA IQ, peak current mode, HTSSOP-16

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Manufacturer Part：

LM43601PWPR

Package：

HTSSOP-16 (6.6 × 5.1 × 1.2 mm, exposed pad)

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Description

Product Overview

The LM43601PWPR is a 3.5V to 36V, 1A synchronous step-down converter from Texas Instruments, packaged in a 16-pin HTSSOP (PWP) with an exposed thermal pad. It features a wide input range with 42V transient capability, peak-current-mode control, and an ultra-low 33 µA quiescent current. The device supports DCM and PFM modes for high light-load efficiency and is pin-to-pin compatible with the LM43600/2/3 and LM46000/1/2 family members.

Key Specifications

Function Synchronous Step-Down Converter
Input Voltage 3.5V to 36V (42V transient)
Output Voltage 1V to 28V (adjustable)
Output Current 1A
Switching Frequency 200 kHz to 2.2 MHz (default 500 kHz)
Control Mode Peak Current Mode
Quiescent Current 33 µA (typical)
Features Power-Good, Precision Enable, Output Tracking
Package HTSSOP-16 (6.6 × 5.1 mm with exposed pad)
Operating Temperature -40°C to +125°C

Features

  • Wide 3.5V to 36V input with 42V transient withstand
  • Ultra-low 33 µA IQ for battery-powered and always-on applications
  • DCM and PFM mode for high light-load efficiency
  • Pin-to-pin compatible family (LM43600/2/3, LM46000/1/2)
  • Integrated internal soft start (4.1 ms, extendable) and output tracking
  • Hiccup-mode short circuit protection with power-good flag

Applications

  • Automotive battery-powered DC-DC conversion
  • Industrial 24V bus point-of-load regulators
  • Battery-powered instrumentation and metering
  • Telecom 12V/24V power supply modules
  • Ruggedized outdoor equipment power systems

The LM43601 is a synchronous step-down converter optimized for wide-input-range applications from 3.5V to 36V, with 42V transient capability for automotive load dump events. The device uses peak-current-mode control with integrated high-side and low-side MOSFETs to deliver up to 1A of continuous output current. With a quiescent current of only 33 µA, it is well-suited for always-on and battery-powered systems. The switching frequency is adjustable from 200 kHz to 2.2 MHz and defaults to 500 kHz, allowing optimization of efficiency versus solution size. The device is part of a pin-to-pin compatible family that includes 0.5A, 1A, 2A, and 3A variants.

The LM43601 employs peak-current-mode control with a fixed-frequency oscillator that sets the switching period. At the start of each cycle, the high-side NMOS switch is turned on, causing the inductor current to ramp up. When the sensed peak current reaches the error amplifier output level, the high-side switch turns off and the low-side synchronous rectifier turns on, allowing the inductor current to ramp down. The error amplifier compares a fraction of the output voltage with the internal reference and adjusts the peak current threshold to regulate the output. In DCM/PFM mode at light loads, the device skips switching pulses to maintain efficiency by reducing gate drive and switching losses. The precision enable pin doubles as a programmable UVLO threshold using an external voltage divider.

Pin Name Type Function
1 BOOT Power Bootstrap capacitor — connect 0.1µF to SW
2 VIN Power Input supply (3.5-36V)
3 EN Input Enable / UVLO programming — float for auto-startup
4 SS/TRK Output Soft start / tracking — external cap to GND
5 RT Input Frequency set resistor — float for 500 kHz default
6 PGOOD Output Power-good open-drain output
7 FB Input Feedback — connect resistor divider from output
8 COMP Output Error amplifier output — compensation network
9-10 GND Power Signal ground
11-12 PGND Power Power ground (exposed pad)
13-14 SW Output Switch node — connect to inductor
15-16 PGND Power Power ground
EP Thermal Pad Power Exposed pad — connect to PGND plane
  • 24V to 5V industrial bus POL regulator with 42V transient protection
  • Automotive 12V battery to 3.3V always-on system supply
  • Smart meter battery-to-system DC-DC with 33µA IQ
  • Telecom 48V-to-12V intermediate bus post-regulation
  • Ruggedized outdoor LED signage power supply
Manufacturer Part Number Package Notes
TI LM43602PWPR HTSSOP-16 2A variant, pin-compatible
TI LM46001PWPR HTSSOP-16 3.5-60V, 1A, higher voltage
Monolithic Power MP8759 QFN-16 2A, 18V input buck
Richtek RT6202 SOT-23-6 2A, 18V, smaller package
Infineon TLE6254-3G PG-DSO-14 Automotive 40V buck
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Quality Assurance

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

 

Shipping & Payment

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5. Local Pickup in Shenzhen

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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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