Texas Instruments LM27313XMFX/NOPB

Overview

LM27313XMFX/NOPB from Texas Instruments is a current-mode boost DC-DC converter IC with 1.6-MHz fixed switching frequency, 30-V internal DMOS FET switch (R_DS(ON) = 650 mΩ max), and 800-mA peak switch current limit. It operates from 2.7 V to 14 V input and delivers up to 260 mA typical output current at 12 V in a 5-pin SOT-23 package - used in portable media players for 5 V-to-12 V rail generation.

For engineers reviewing the LM27313XMFX/NOPB datasheet, LM27313XMFX/NOPB pinout, LM27313XMFX/NOPB application, or LM27313XMFX/NOPB equivalent, key selection criteria include its internally compensated architecture, logic-level shutdown (<1 µA shutdown current), cycle-by-cycle current limiting, thermal shutdown protection, and compatibility with ceramic input/output capacitors (2.2 µF and 4.7 µF typical) and Schottky diodes like MBR0520.

Technical Context

This device implements peak current-mode control with an internal ramp generator and PWM comparator, enabling fast transient response across its 2.7–14 V input range. The feedback loop uses a 1.23-V reference voltage at the FB pin and regulates output via external resistive divider (e.g., R1 = 117 kΩ, R2 = 13.3 kΩ for 12 V).

Protection includes per-cycle current limiting triggered by the internal 50-mΩ sense path and thermal shutdown. The SHDN pin supports active-low logic-level control with 0.5 V turn-off threshold and 1.5 V turn-on threshold, and draws only 24 nA in shutdown mode.

Key Specifications

Pinout & Package

LM27313XMFX/NOPB is housed in a 5-pin SOT-23 package (2.90 mm × 1.60 mm body size) with exposed pad not electrically connected. Thermal resistance is R_θJA = 166.3°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Compared with TPS61040DRVR and MAX1706AESA+, LM27313XMFX/NOPB offers simpler implementation (no external compensation), lower shutdown current (24 nA vs. 1 µA), and proven thermal robustness in SOT-23 - making it preferred for cost-sensitive, battery-operated consumer electronics with 5–12 V output requirements.

Availability

LM27313XMFX/NOPB is available at Aetrix Electronics and suitable for portable media players, digital cameras, PDAs, GPS navigation devices, and handheld instrumentation requiring stable component supply and long-term production continuity.

Supply support for LM27313XMFX/NOPB 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, embedded processing, and power management solutions, with leadership in high-reliability, energy-efficient IC design.

The LM27313XMFX/NOPB belongs to TI's current-mode boost converter product line, engineered for compact, high-frequency DC-DC conversion in battery-powered portable electronics with stringent size and quiescent current constraints.

FAQ

What is the maximum output voltage achievable with LM27313XMFX/NOPB?

The LM27313XMFX/NOPB supports output voltages up to 28 V, constrained by its 30-V internal FET breakdown rating and maximum 80% duty cycle. At 5 V input, practical outputs reach 25 V (e.g., 5 V → 25 V at ~75% duty cycle). Output stability depends on proper selection of feedback resistors, Schottky diode (e.g., MBR0540 for ≥25 V), and output capacitor voltage rating. Always verify thermal performance at high V_OUT/I_LOAD combinations using the device's efficiency curves.

Does LM27313XMFX/NOPB require external compensation components?

No, LM27313XMFX/NOPB features fully internal compensation - no external RC network is needed. However, a feed-forward capacitor (C_F = 220 pF typical, placed between FB and VIN) is mandatory for loop stability and must be included per the datasheet's Figure 12. Omitting C_F causes oscillation due to missing zero in the control loop transfer function.

What is the recommended inductor value for LM27313XMFX/NOPB in a 5 V-to-12 V application?

TI recommends a 10-µH shielded power inductor (e.g., Coilcraft MSS5131-103) for 5 V-to-12 V operation at 250 mA load. This value ensures continuous conduction mode across the full load range, minimizes output ripple, and aligns with the device's 1.6-MHz switching frequency. Inductor saturation current must exceed 800 mA peak, and DCR should be ≤150 mΩ to maintain efficiency above 88%.

Can LM27313XMFX/NOPB operate from a single Li-ion cell?

Yes, LM27313XMFX/NOPB operates from 2.7 V minimum input, covering the full discharge range of a single Li-ion cell (2.7–4.2 V). At 3.3 V input, it delivers 12 V at 250 mA with >87% efficiency. Ensure the external Schottky diode (e.g., MBR0520) and output capacitor (≥4.7 µF X7R) are rated for low-voltage operation, and verify startup behavior down to 2.7 V using the typical startup waveform in Figure 18 of the datasheet.

What is the thermal performance of LM27313XMFX/NOPB in SOT-23?

LM27313XMFX/NOPB has R_θJA = 166.3°C/W (JEDEC JESD51-7, 2-layer board). At 250 mA output into 12 V with 5 V input, power dissipation is ~180 mW - resulting in ~30°C junction rise above ambient. For reliable operation at full load and high ambient temperature, use a 250-mm² copper pour under the exposed pad (if present) and minimize trace length to GND. Thermal shutdown activates at ~150°C junction temperature with ~20°C hysteresis.