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LMR14030SDDAR

Buck Converter, 40V 3.5A, 2.2MHz, 25uA Iq, SO-8 PP

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Manufacturer Part：

LMR14030SDDAR

Package：

SO PowerPAD-8 (4.9 x 3.9 x 1.5 mm)

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Description

Product Overview

The LMR14030SDDAR from Texas Instruments is a 40V, 3.5A step-down DC-DC converter with 2.2MHz switching frequency and 25uA quiescent current in an SO PowerPAD-8 package.

Key Specifications

Type 40V, 3.5A Step-Down DC-DC Converter
Input Voltage 4 V to 40 V
Output Current 3.5 A (continuous)
Output Voltage Adjustable (down to 1.25V)
Switching Frequency 200 kHz to 2.2 MHz (programmable)
Minimum On-Time 75 ns
Quiescent Current 25 uA (typical, standby)
Shutdown Current 1 uA (typical)
Reference Voltage 0.75 V (typical)
Efficiency Up to 92% @ VIN=12V, VOUT=5V, 3.5A
Package SO PowerPAD-8 (DDA)
Operating Temperature -40C to +125C

Features

  • 4V to 40V wide input range
  • 3.5A continuous output current
  • 2.2MHz maximum switching frequency
  • 25uA ultra-low quiescent current in standby
  • 75ns minimum on-time for high step-down ratios
  • Integrated 70mOhm NMOS switch
  • Programmable switching frequency via RT pin
  • Internal loop compensation

Applications

  • Automotive and industrial power supplies
  • Distributed power architecture point-of-load
  • Battery-powered systems
  • FPGA and processor power rails

The LMR14030SDDAR from Texas Instruments is a 40V, 3.5A synchronous step-down (buck) DC-DC converter in a thermally-enhanced SO PowerPAD-8 package. The wide 4V to 40V input range accommodates automotive 12V/24V batteries and industrial 24V/36V supplies. The 3.5A output current supports medium-power loads including FPGAs, processors, and motor drivers. The programmable switching frequency from 200 kHz to 2.2 MHz allows designers to optimize between efficiency (lower frequency) and solution size (higher frequency). The 75 ns minimum on-time enables high step-down conversion ratios at high switching frequencies (e.g., 36V to 1.2V at 2.2 MHz). The 25 uA standby quiescent current and 1 uA shutdown current minimize battery drain in always-on applications. The integrated 70 mOhm NMOS power switch eliminates the need for an external MOSFET. Internal loop compensation simplifies the design. The PowerPAD package provides low thermal resistance for reliable operation at high output currents.

The LMR14030SDDAR uses a peak-current-mode control architecture with an integrated high-side NMOS power switch and a low-side NMOS synchronous rectifier. The control loop operates as follows: the error amplifier compares the feedback voltage (FB pin) with the internal 0.75V reference, generating a control voltage that sets the peak switch current threshold. At the start of each switching cycle, the high-side NMOS turns on and inductor current ramps up. When the inductor current reaches the peak threshold (set by the error amplifier), the high-side NMOS turns off and the low-side synchronous rectifier turns on, allowing inductor current to ramp down. The switching frequency is set by an external resistor on the RT pin, which programs an internal oscillator. The peak-current-mode control provides inherent cycle-by-cycle current limiting and fast transient response. The internal loop compensation network stabilizes the converter over a wide range of output capacitances and inductor values. The 25 uA standby mode is entered when the FB voltage drops below the regulation threshold, reducing switching frequency to maintain regulation with minimum switching losses.

Pin Name Type Function
1 BOOT Power Bootstrap capacitor for high-side gate drive
2 VIN Power Input supply (4-40V)
3 SW Output Switch node (inductor connection)
4 GND Power Ground (connected to PowerPAD)
5 FB Input Feedback voltage (0.75V reference)
6 EN/UVLO Input Enable / undervoltage lockout
7 RT Input Switching frequency programming resistor
8 PG Output Power good indicator (open-drain)
  • 24V industrial to 5V/3.3V POL converter at 2.2MHz for compact design
  • 12V automotive battery to 3.3V MCU supply with 25uA standby current
  • 48V telecom intermediate bus to 12V distribution with 3.5A output
  • FPGA 1.2V core supply from 5V input with 75ns minimum on-time
Manufacturer Part Number Package Notes
TI LMR14050SDDAR SO-8 PP 5A version, higher current
TI LMR16030SDDAR SO-8 PP 60V input, lower current
TI LMR23630ADDAR SO-8 PP 36V, 3A, similar class
Monolithic Power MP8759GD-Z SOIC-8 36V, 5A, alternative
Richtek RT6208GQW DFN-10 36V, 2A, smaller package
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