Texas Instruments LM2830ZMFX

Overview

LM2830ZMFX from Texas Instruments is a high-frequency, current-mode PWM step-down DC-DC regulator IC in a 5-pin SOT-23 package, delivering up to 1.0-A output current with 3.0-MHz fixed switching frequency, 0.6-V internal reference (±2%), and 130-mΩ PMOS switch. It regulates 3.0–5.5-V input to adjustable 0.6–4.5-V output for compact point-of-load power in USB-powered devices and set-top boxes.

For engineers reviewing the LM2830ZMFX datasheet, LM2830ZMFX pinout, LM2830ZMFX application, or LM2830ZMFX equivalent, key selection criteria include its 3.0-MHz operation enabling ultra-small magnetics, thermal shutdown at 165°C, 30-nA shutdown current, ±2% feedback voltage accuracy, and SOT-23 footprint compatibility with space-constrained embedded designs.

Technical Context

The LM2830ZMFX implements constant-frequency current-mode control with internal compensation, using a 0.6-V reference and pulse-by-pulse current limiting to maintain regulation across line and load transients. Its 3.0-MHz oscillator supports sub-1-µH inductors and low-ESR ceramic capacitors without stability compromise.

Functional modes include active regulation, enable-controlled shutdown (30-nA quiescent), soft-start (600-µs ramp), overvoltage protection (15% above VREF), and undervoltage lockout with 430-mV hysteresis (2.73-V turn-on, 2.3-V turn-off).

Key Specifications

Pinout & Package

LM2830ZMFX uses a 5-pin SOT-23 package (2.90 mm × 1.60 mm) with exposed pad not present; thermal path relies on PCB copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LM2830ZMFX, LM2830XMFX trades 3.0-MHz speed for slightly better light-load efficiency but increases solution size, while TPS62231DRVR offers synchronous rectification and improved accuracy at the cost of non-pin-compatible packaging and revised layout.

Availability

LM2830ZMFX is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, DSL modems, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.

Supply support for LM2830ZMFX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs since the 1980s.

The LM2830 product line delivers high-frequency, monolithic buck regulators optimized for space-constrained, battery-sensitive, and thermally demanding applications in consumer, industrial, and automotive electronics.

FAQ

What is the maximum output current supported by the LM2830ZMFX?

The LM2830ZMFX supports up to 1.0 A of continuous output current under recommended operating conditions (T_J ≤ 125°C, VIN = 3.0–5.5 V). Its typical current limit is 1.75 A, with a minimum guaranteed limit of 1.2 A across –40°C to +125°C. Actual deliverable current depends on thermal design, input voltage, and output voltage; at 3.3-V output from 5-V input, full 1.0-A load is sustainable with adequate PCB copper area.

Does the LM2830ZMFX require an external catch diode?

Yes, the LM2830ZMFX requires an external Schottky catch diode connected between SW and GND. The IC integrates only the high-side PMOS switch; the diode provides the return path for inductor current during the switch off-time. TI recommends a 0.3-V_F, 1.5-A Schottky diode such as Toshiba CRS08 to minimize conduction loss and maximize efficiency at 1-A load.

How is the output voltage set on the LM2830ZMFX?

The output voltage of the LM2830ZMFX is set using a resistor divider from V_OUT to FB to GND. With a precise 0.600-V internal reference, V_OUT = 0.6 × (1 + R1/R2). For example, R2 = 15 kΩ and R1 = 15 kΩ yields 1.2 V. The FB pin draws only 0.1–100 nA bias current, so standard 1% metal-film resistors provide stable, accurate regulation without loading error.

What is the purpose of the EN pin on the LM2830ZMFX?

The EN (Enable) pin on the LM2830ZMFX controls device startup and shutdown. Driving EN ≥1.8 V enables regulation; pulling EN ≤0.4 V places the IC in ultra-low-power shutdown mode drawing only 30 nA. The pin must never float-TI recommends connecting it to VIN via a 100-kΩ pull-up resistor if always-on operation is required. This pin enables power sequencing and battery-saving sleep modes in portable systems.

Can the LM2830ZMFX operate with a 3.3-V input to generate 1.2-V output?

Yes, the LM2830ZMFX operates with a 3.3-V input to generate 1.2-V output. Its 3.0-MHz switching frequency and current-mode architecture maintain stability and transient response across the full 3.0–5.5-V input range. At 3.3-V input, the duty cycle is ~36%, well within the 7–90% range specified. Efficiency remains >88% at 1-A load, and thermal performance is enhanced due to reduced voltage drop across the 130-mΩ PMOS switch.