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Texas Instruments LM27313XMFX
- Part No.:
- LM27313XMFX
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM27313XMFX.pdf
- Description:
- IC REG BOOST ADJ 800MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,372
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Product details
Overview
LM27313XMFX from Texas Instruments is a current-mode boost DC-DC converter IC with fixed 1.6-MHz switching frequency, integrated 30-V/800-mA DMOS FET switch, and internal compensation. It operates from 2.7 V to 14 V input and delivers up to 260 mA typical output current at 12 V in compact SOT-23-5 packaging-ideal for space-constrained portable power rails.
For engineers reviewing the LM27313XMFX datasheet, LM27313XMFX pinout, LM27313XMFX application, or LM27313XMFX equivalent, key selection considerations include its cycle-by-cycle current limiting, logic-level shutdown (<1 µA quiescent), 1.23-V feedback reference, 500-mΩ RDS(ON), and thermal shutdown protection in automotive-grade variants.
Technical Context
The LM27313XMFX uses peak-current-mode control with an internal ramp generator and PWM comparator to regulate output voltage via external resistive divider on FB. Its current-sense path integrates directly with the switch FET's source-drain voltage drop, enabling fast transient response without external sense resistors.
It features internally compensated loop dynamics, eliminating need for external compensation components except feed-forward capacitor (CF = 220 pF typical). Shutdown functionality is implemented as active-low logic input (SHDN) with 0.5 V turn-off threshold and <24 nA shutdown current-enabling battery-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz (fixed); enables use of ≤10-µH inductors and ≤10-µF ceramic capacitors for ultra-compact layout |
| Input Voltage Range | 2.7 V to 14 V; supports single-cell Li-ion, multi-cell alkaline, and 12-V automotive auxiliary rails |
| Output Current (Typ) | 260 mA at 12 V (VIN = 5 V); limited by thermal design and duty cycle-dependent switch current (≤800 mA peak) |
| RDS(ON) | 500 mΩ (typ); minimizes conduction loss and self-heating at high load currents |
| Feedback Reference | 1.23 V (±2.5% over −40°C to +125°C); sets output via external resistor divider (e.g., R1 = 117 kΩ, R2 = 13.3 kΩ for 12 V) |
| Shutdown Current | 24 nA (typ); extends battery life in always-on systems with periodic wake-up cycles |
| Max Switch Voltage | 30 V; supports output voltages up to 28 V with margin for diode forward drop and ripple |
Pinout & Package
LM27313XMFX 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 RθJA = 166.3°C/W enables operation up to +125°C junction temperature with minimal copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch Drain Output | Connects to inductor and Schottky diode anode; carries pulsed 800-mA peak current and 30-V max voltage |
| 2 - GND | Analog & Power Ground | Single-point return for FB, SHDN, and VIN bypass; must be low-impedance path to minimize noise coupling |
| 3 - FB | Feedback Input | Senses output voltage via resistive divider; 60-nA bias current enables high-value dividers (e.g., 117k/13.3k) with low power loss |
| 4 - SHDN | Active-Low Enable | Pulled high to VIN for normal operation; driven low to disable switching and reduce IQ to 24 nA |
| 5 - VIN | Power Input | Supplies internal circuitry and switch gate driver; requires 2.2-µF ceramic capacitor placed within 3 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Current-Mode Control | Enables stable regulation across wide input/output ratios and fast load transient recovery without external compensation |
| Integrated 30-V FET | Eliminates external high-voltage MOSFET and associated gate drive complexity for 5–28 V boost applications |
| Logic-Level Shutdown | Supports direct interface to microcontroller GPIO without level-shifting; compatible with 1.8-V, 3.3-V, and 5-V I/O |
| Cycle-by-Cycle Current Limit | Prevents inductor saturation and thermal runaway during short-circuit or startup inrush conditions |
| Thermal Shutdown | Automatically disables switching if junction temperature exceeds safe limit, then auto-restarts when cooled |
Applications
| White LED Backlighting | PDA & Handheld Computing |
|---|---|
Use Scenario: Driving parallel strings of white LEDs from single-cell Li-ion (3.0–4.2 V) in portable displays. IC Role / Device Role / Timing Role: Boost controller regulating constant current via FB-sensed current-sense resistor; 1.6-MHz switching avoids audible noise. Use Value: Delivers 260 mA at 12 V with >88% efficiency at 250 mA, minimizing heat in thin form factors. | Use Scenario: Generating 5 V or 12 V system rail from 3.3 V or battery in palm-top computers and PDAs. IC Role / Device Role / Timing Role: Primary DC-DC boost stage powering USB peripherals, memory, or display drivers. Use Value: Internal compensation and 5-pin SOT-23 reduce BOM count and PCB area by >40% vs. controller+MOSFET solutions. |
| Digital Camera Power | Portable Media Player |
Use Scenario: Supplying 15 V flash LED driver or 20 V CCD sensor bias from 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: High-ratio boost converter operating at 62.5% duty cycle (5 V → 12 V); uses MBR0520 Schottky diode. Use Value: 30-V switch rating provides 5-V margin for diode drop and transients, ensuring reliability during burst-mode flash operation. | Use Scenario: Powering OLED display and audio codec from shared 3.6 V battery in MP3 players and gaming handhelds. IC Role / Device Role / Timing Role: Dual-rail generator (e.g., 5 V for display, 12 V for audio amplifier) using single inductor per rail. Use Value: 24-nA shutdown current extends standby time to weeks; logic-level SHDN enables MCU-controlled power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27314XMFX | Same SOT-23-5 package but 28-V switch rating and 1.2-MHz switching frequency; higher RDS(ON) (650 mΩ) | Better suited for lower-frequency, higher-output-voltage designs where EMI filtering is prioritized over size | Select LM27314XMFX only if 28-V switch rating is required and 1.2-MHz operation is acceptable for larger passive sizing |
| TPS61040DRVR | 28-V switch, 500-kHz switching, 1.22-V FB reference, and integrated soft-start; requires external compensation | Preferred for cost-sensitive, low-EMI applications needing soft-start and wider input range (1.8–6 V) | Choose TPS61040DRVR when soft-start, lower EMI, or sub-2-V input capability outweighs need for smallest solution size |
Compared with LM27314XMFX and TPS61040DRVR, LM27313XMFX offers highest power density due to 1.6-MHz operation and lowest RDS(ON), making it optimal for space-constrained 5–12 V boost where thermal headroom is limited.
Availability
LM27313XMFX is available at Aetrix Electronics and suitable for portable media players, digital cameras, white LED backlighting, and handheld computing applications requiring stable component supply, long-lifecycle support, and automotive-qualified alternatives (LM27313-Q1).
Supply support for LM27313XMFX 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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM27313XMFX belongs to TI's high-frequency boost converter product line, engineered specifically for miniaturized, battery-powered systems demanding high efficiency, low quiescent current, and simplified design with internal compensation.
FAQ
What is the maximum output voltage achievable with LM27313XMFX?
The LM27313XMFX supports output voltages up to 28 V, constrained by its 30-V internal FET switch rating and practical limits of external Schottky diode voltage rating (e.g., MBR0540 for ≥40 V). At 12 V output, typical efficiency exceeds 88% at 250 mA load with 5 V input. The actual maximum depends on duty cycle, diode forward voltage, and thermal management-designs above 20 V require careful attention to peak switch voltage stress and layout parasitics. LM27313XMFX achieves this using only five external components in standard SOT-23 footprint.
Does LM27313XMFX require external compensation components?
No, LM27313XMFX features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. However, a feed-forward capacitor (CF = 220 pF typical) between FB and VIN is mandatory for loop stability-it introduces a zero near 8 kHz to counteract right-half-plane zero effects inherent to boost topology. Omitting CF causes oscillation or poor transient response. All other compensation is embedded in the IC's error amplifier and PWM modulator, verified across −40°C to +125°C. LM27313XMFX thus reduces BOM count and layout sensitivity versus controller-based alternatives.
How does the shutdown pin (SHDN) function on LM27313XMFX?
The SHDN pin on LM27313XMFX is an active-low logic input with 0.5 V turn-off threshold and 500 nA bias current. When pulled below 0.5 V, the IC disables switching, reduces quiescent current to 24 nA (typ), and places SW in high-impedance state. For normal operation, SHDN must be tied to VIN (via 50–100 kΩ pullup) or actively driven high; leaving it floating risks erratic behavior. This feature enables MCU-controlled power gating in battery-powered devices. LM27313XMFX maintains full specification compliance across all operating modes, including shutdown entry/exit timing.
What type of diode is recommended for use with LM27313XMFX?
A Schottky diode is mandatory for LM27313XMFX due to its low forward voltage and fast recovery-critical for efficiency at 1.6-MHz switching. For output voltages ≤15 V, TI specifies MBR0520 (20-V, 500-mA avg) as the reference diode. For 15–25 V outputs, MBR0530 (30-V) is recommended; for ≥25 V, MBR0540 (40-V) is required. Diode selection directly impacts thermal performance: reverse leakage and forward drop affect light-load efficiency and thermal rise. LM27313XMFX's 30-V switch rating allows margin for diode VF and transient spikes, but diode voltage rating must exceed VOUT + VF + 20% safety margin.
Can LM27313XMFX operate in discontinuous conduction mode (DCM)?
Yes, LM27313XMFX naturally transitions into discontinuous conduction mode (DCM) at light loads-typically below ~33 mA for a 5 V → 12 V, 10-µH design-as confirmed by inductor current waveform analysis in the datasheet. In DCM, peak switch current decreases while maintaining regulation via pulse-frequency modulation (PFM)-like behavior. Efficiency remains >80% down to 10 mA load. The IC's current-mode architecture ensures stable operation across both continuous and discontinuous modes without external mode-control circuitry. LM27313XMFX does not include forced-CCM or valley-switching features, so DCM operation is inherent and benign for low-power standby states.
LM27313XMFX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 800mA (Switch)
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM27313XMFX FAQ
1.How can I place an order for LM27313XMFX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27313XMFX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM27313XMFX reliable?
The price and inventory of LM27313XMFX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27313XMFX is usually 5 days.
3.What payment methods are accepted for LM27313XMFX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27313XMFX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27313XMFX?
LM27313XMFX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27313XMFX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM27313XMFX?
For technical support, including LM27313XMFX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27313XMFX requirements.
6.How does Aetrix verify that LM27313XMFX is sourced from the original manufacturer or authorized distributors?
All LM27313XMFX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM27313XMFX meets industry standards.
7.What is the process for return or replacement of LM27313XMFX?
All LM27313XMFX units undergo pre-shipment inspection (PSI). If there is an issue with LM27313XMFX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM27313XMFX part is unused and in its original packaging.
Return procedure for LM27313XMFX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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