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Texas Instruments LM5158RTER
- Part No.:
- LM5158RTER
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LM5158RTER.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,427
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Product details
Overview
LM5158RTER from Texas Instruments is a wide-input non-synchronous boost/SEPIC/flyback DC-DC controller with integrated 85-V, 3.26-A N-channel MOSFET, 2.2-MHz programmable switching frequency, ±1% feedback reference, and dual random spread spectrum for EMI reduction. It operates from 3.2 V to 60 V input (65-V abs max), delivers up to 83-V output (85-V abs max), and supports primary-side regulation in flyback without optocoupler - ideal for battery-powered industrial sensors and hold-up capacitor charging.
For engineers reviewing the LM5158RTER datasheet, LM5158RTER pinout, LM5158RTER application, or LM5158RTER equivalent, key selection criteria include its 133-mΩ RDS(ON), 2.6-µA shutdown current, 100–2200-kHz dynamically programmable fSW, hiccup-mode overload protection, and BIAS-pin-supported operation down to 1.5-V input when BIAS ≥ 3.2 V.
Technical Context
The LM5158RTER uses peak-current-mode control with an internal transconductance error amplifier (Gm = 2 mA/V) and programmable soft-start via external capacitor. Its dual random spread spectrum modulation (±7.8% frequency deviation) operates across the full 100 kHz–2.2 MHz range and is enabled/disabled via MODE pin voltage configuration.
It integrates a high-voltage BIAS-regulated VCC supply (4.66–5.14 V at 18 mA), line UVLO with 1.425–1.575-V threshold and 50-mV hysteresis, and accurate overvoltage (107–113% of VREF) and undervoltage (87–93% of VREF) protection on FB. Thermal shutdown triggers at 175°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2 V to 60 V (65-V absolute max); enables single-cell Li-ion start-up and transient robustness in industrial power rails |
| Output Voltage Capability | Up to 83 V (85-V abs max); supports high-voltage bias supplies for LED drivers and piezo actuators |
| Switching Frequency | 100 kHz to 2.2 MHz (resistor-programmable); 2.2-MHz operation minimizes AM-band interference and reduces passive size |
| RDS(ON) | 133 mΩ @ VBIAS = 12 V; lowers conduction loss and improves efficiency in high-current boost stages |
| Current Limit | 3.26 A (min), 3.75 A (typ), 4.24 A (max); accurate peak-current limit avoids overdesigning magnetics across input range |
| Feedback Reference | 0.99 V to 1.01 V (±1%); enables precise output regulation in primary-side flyback and SEPIC topologies |
| Shutdown Current | ≤2.6 µA @ VBIAS = 12 V; extends battery life in always-on sensor nodes and loop-powered systems |
Pinout & Package
LM5158RTER is housed in a 16-pin WQFN package (3.00 mm × 3.00 mm) with exposed thermal pad (EP) connected to AGND. The leadless QFN construction supports low-inductance layout and EMI mitigation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 PGND | Power ground return | Source connection of internal MOSFET; must be low-impedance path to minimize switching noise and thermal resistance |
| 2 VCC | VCC regulator output | Supplies internal circuitry and gate driver; requires 1-µF ceramic bypass to PGND |
| 3 BIAS | High-voltage bias input | Feeds internal VCC regulator; supports 3.2–60 V operation and enables 1.5-V min input when ≥3.2 V |
| 4 PGOOD | Open-drain power-good indicator | Signals valid output regulation (FB > VUVTH); requires external pullup for system sequencing |
| 5 RT | Frequency programming | Resistor-to-AGND sets fSW from 100 kHz to 2.2 MHz; defines minimum on-time and duty-cycle limits |
| 6 EN/UVLO/SYNC | Multi-function control | Enables converter, programs UVLO thresholds via resistor divider, or accepts external sync clock pulses |
| 7 AGND | Analog ground reference | Reference for FB, COMP, SS, MODE; must connect via short, wide trace to minimize noise coupling |
| 8 COMP | Error amplifier output | Drives external compensation network; sourcing capability (180 µA) and clamping (1–2.8 V) define loop stability |
| 9 FB | Inverting error amp input | Sets output voltage via resistive divider; ±1% reference enables <1% output tolerance in closed-loop designs |
| 10 SS | Soft-start ramp control | External capacitor sets output voltage ramp rate; internal 10-µA current source ensures controlled start-up |
| 11 MODE | Protection & spread-spectrum mode select | Voltage-selectable: 0 V (hiccup off, SS off), 370 mV (hiccup on, SS on), 620 mV (hiccup on, SS off), >1 V (hiccup off, SS on) |
| 13, 14 SW | Internal MOSFET drain | Connects to inductor/transformer; withstands 85-V transients; 133-mΩ RDS(ON) defines conduction loss |
| 12, 15 NC | No connect | No internal connection; must remain unconnected per datasheet |
| EP | Exposed thermal pad | Must be soldered to AGND plane for thermal performance (RθJB = 19.1°C/W) and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation support | Integrated error amplifier and accurate VREF enable optocoupler-free flyback designs, reducing BOM cost and improving reliability |
| Dual random spread spectrum | Selectable ±7.8% frequency modulation across full fSW range suppresses narrowband EMI peaks without compromising transient response |
| Programmable hiccup-mode protection | Configurable via MODE pin; limits fault energy during sustained overload while enabling automatic recovery after reset cycles |
| Low-power operation | 670-µA operating current and 2.6-µA shutdown current extend runtime in battery-backed applications such as fire detection and portable instrumentation |
| Wide-frequency synchronization | EN/UVLO/SYNC pin accepts external clock signals from 100 kHz to 2.2 MHz, enabling deterministic timing in multi-rail power systems |
Applications
| Battery-Powered Wide-Input Boost | LED Bias Supply |
|---|---|
Use Scenario: Portable gas detector powered by single Li-ion cell (3.0–4.2 V) requiring stable 24-V rail for sensor bias and signal conditioning. IC Role / Device Role / Timing Role: Non-synchronous boost controller regulating 24 V from variable battery input; uses BIAS pin tied to output to sustain operation below 3.2 V. Use Value: Enables >10-year battery life via 2.6-µA shutdown current and pulse-skipping light-load efficiency; 2.2-MHz operation allows miniature 2.2-µH inductor. | Use Scenario: High-brightness LED string in industrial signage requiring constant-current drive from 12-V bus with 48-V compliance voltage. IC Role / Device Role / Timing Role: Boost controller generating regulated 48-V bias rail; FB divider sets output, PGOOD enables LED driver enable logic. Use Value: ±1% VREF ensures <1% LED current variation; 133-mΩ RDS(ON) maintains >92% efficiency at 1-A load. |
| Multiple-Output Flyback (PSR) | Hold-Up Capacitor Charger |
Use Scenario: Isolated 5-V/3.3-V/12-V power supply for PLC I/O module using transformer auxiliary winding for BIAS. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller eliminating optocoupler; BIAS supplied from auxiliary winding for improved cross-regulation. Use Value: Reduces component count and failure points; dual spread spectrum meets Class B conducted EMI limits without Y-capacitors. | Use Scenario: UPS front-end charger maintaining 350-V DC bus during AC outage using supercapacitor bank. IC Role / Device Role / Timing Role: Boost converter charging 350-V hold-up capacitor from 48-V backup battery; operates in discontinuous conduction mode for precise charge control. Use Value: 83-V output rating and 85-V abs max SW rating ensure safe operation at 350-V bus with snubber margin; programmable UVLO prevents deep discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC/flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5157RTER | Lower 65-V max SW voltage, 2.1-A current limit, no dual spread spectrum (single only), same 16-pin WQFN | Not suitable for >65-V output or stringent EMI environments requiring dual modulation | Select when output ≤65 V and EMI requirements are less demanding; lower cost alternative |
| LM5122MHX/NOPB | Wider 3–75-V input, 100-V SW rating, external MOSFET, 1.5-MHz max fSW, no integrated spread spectrum | Requires external high-voltage FET and gate driver; better for >83-V outputs or higher power (>100 W) | Choose for designs needing >83-V output or higher efficiency at >50-W level; adds complexity but increases voltage headroom |
Compared with LM5157RTER and LM5122MHX/NOPB, the LM5158RTER uniquely combines 85-V SW rating, dual random spread spectrum, and primary-side regulation in a 3-mm QFN - making it optimal for compact, high-voltage, low-EMI industrial converters where board space and regulatory compliance are critical.
Availability
LM5158RTER is available at Aetrix Electronics and suitable for battery-powered sensors, industrial PLCs, and LED bias supplies requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for LM5158RTER 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 LM5158x product line is designed for high-voltage, wide-input DC-DC conversion in space-constrained battery and industrial applications - emphasizing low quiescent current, EMI robustness, and topology flexibility (boost/SEPIC/flyback).
FAQ
What is the minimum input voltage required for LM5158RTER startup?
The LM5158RTER starts up from a minimum 3.2-V input when powered solely from VSUPPLY. However, if the BIAS pin is supplied with ≥3.2 V from an auxiliary source (e.g., output rail or separate supply), the device operates with input as low as 1.5 V - enabling ultra-low-voltage battery operation after initial start-up. This behavior is confirmed in Section 3 and Figure 9-5 of the SNVSBZ7 datasheet.
How does the MODE pin configure spread spectrum and hiccup protection on LM5158RTER?
The MODE pin on LM5158RTER selects operating modes via applied voltage: 0 V disables both hiccup mode and spread spectrum; 370 mV enables both; 620 mV enables hiccup mode only; >1 V enables spread spectrum only. These thresholds correspond to specific resistor dividers to AGND (e.g., 37.4 kΩ for 370 mV), as defined in Table 7-1 and Section 9.3.11 of the datasheet.
Can LM5158RTER be used in primary-side regulated flyback without an optocoupler?
Yes, LM5158RTER supports primary-side regulation in flyback topology using its integrated transconductance error amplifier and ±1% accurate 1-V reference. When configured with appropriate transformer auxiliary winding for BIAS and proper compensation on COMP, it eliminates the need for optocoupler and secondary-side TL431, reducing cost and improving reliability - as demonstrated in Figure 10-5 and Section 10.3 of SNVSBZ7.
What is the maximum achievable switching frequency and how is it set on LM5158RTER?
The LM5158RTER supports a maximum switching frequency of 2.2 MHz, set by connecting a 9.09-kΩ resistor between RT and AGND. Frequency scales inversely with RT value (e.g., 220 kΩ yields ~100 kHz). Minimum on-time is 80 ns at 2.2 MHz, and maximum duty cycle is 80–90% depending on RT, as specified in Section 8.5 and Figure 8-10 of the datasheet.
Does LM5158RTER provide overvoltage protection, and how is it implemented?
Yes, LM5158RTER includes output overvoltage protection (OVP) triggered when FB voltage exceeds 107–113% of the 1-V reference. Upon OVP detection, the controller immediately disables the power switch and holds shutdown until reset via UVLO or EN cycling. This protection is independent of loop regulation and operates even during soft-start, as detailed in Section 8.5 (VOVTH parameter) and Section 9.3.9 of SNVSBZ7.
LM5158RTER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 83V
- Current - Output:
- 3.26A (Switch)
- Frequency - Switching:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (3x3)
LM5158RTER FAQ
1.How can I place an order for LM5158RTER through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5158RTER 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 LM5158RTER reliable?
The price and inventory of LM5158RTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5158RTER is usually 5 days.
3.What payment methods are accepted for LM5158RTER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5158RTER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5158RTER?
LM5158RTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5158RTER 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 LM5158RTER?
For technical support, including LM5158RTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5158RTER requirements.
6.How does Aetrix verify that LM5158RTER is sourced from the original manufacturer or authorized distributors?
All LM5158RTER 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 LM5158RTER meets industry standards.
7.What is the process for return or replacement of LM5158RTER?
All LM5158RTER units undergo pre-shipment inspection (PSI). If there is an issue with LM5158RTER, 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 LM5158RTER part is unused and in its original packaging.
Return procedure for LM5158RTER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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