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Texas Instruments LM5157RTER
- Part No.:
- LM5157RTER
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LM5157RTER.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,199
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Product details
Overview
LM5157RTER from Texas Instruments is a wide-input non-synchronous boost/SEPIC/flyback DC-DC controller with integrated 50-V, 45-mΩ N-channel MOSFET. It operates from 2.9 V to 45 V input (down to 1.5 V with BIAS ≥ 2.9 V), delivers up to 48-V output, supports 100 kHz–2.2 MHz programmable switching frequency, and features dual random spread spectrum for EMI reduction - used in portable speaker power supplies and holdup capacitor chargers.
For engineers reviewing the LM5157RTER datasheet, LM5157RTER pinout, LM5157RTER application, or LM5157RTER equivalent, key selection criteria include its 6.5-A peak current limit, ±1% FB reference accuracy, PGOOD indicator, hiccup-mode overload protection, and 16-pin 3 mm × 3 mm WQFN package with exposed thermal pad.
Technical Context
The LM5157RTER uses peak-current-mode control and supports three topologies: boost, SEPIC, and primary-side regulated flyback. Its internal VCC regulator accepts BIAS input up to 45 V (50-V abs max) and delivers stable 4.9-V typical VCC for gate drive and logic, enabling operation below 5-V input when BIAS is externally supplied.
It implements digitally controlled dual random spread spectrum (DRSS) via MODE pin configuration (370 mV or >1 V), combining low-frequency triangular dithering with high-frequency cycle-by-cycle randomness to suppress conducted and radiated EMI across a broad band - independent of external sync clock, which disables DRSS when applied.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9 V to 45 V; supports single-cell Li-ion startup and transient immunity up to 50 V |
| Max Output Voltage | 48 V (SW pin rated 50 V absolute max); enables high-voltage bias rails for piezo/motor drivers |
| Switching Frequency | 100 kHz to 2.2 MHz; set by RT resistor; 2.2 MHz minimizes magnetics size and avoids AM band |
| Peak Current Limit | 6.5 A (min); accurate over input voltage range - reduces inductor overdesign margin |
| Feedback Reference | 1.0 V ±1%; enables precise output regulation in boost/SEPIC/flyback configurations |
| Shutdown IQ | ≤2.6 µA; extends battery life in always-on portable systems |
| rDS(ON) | 45 mΩ @ VBIAS = 12 V; lowers conduction loss and thermal stress at full load |
Pinout & Package
LM5157RTER is housed in a thermally enhanced 16-pin WQFN (RTE) package measuring 3.00 mm × 3.00 mm with an exposed thermal pad (EP) that must be soldered to AGND for optimal thermal performance (RθJB = 17.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 PGND | Power ground return | Source connection of internal MOSFET; requires low-inductance PCB plane tie to minimize switching noise |
| 2 VCC | VCC regulator output | Supplies internal logic and gate driver; bypass with 1-µF ceramic + 5-Ω series resistor to PGND |
| 3 BIAS | High-voltage supply input | Feeds internal VCC regulator; supports up to 45 V (50-V abs max); enables operation below 2.9 V input if ≥2.9 V |
| 4 PGOOD | Open-drain power-good flag | Asserts low when FB falls below 90% VREF; requires external pull-up for system sequencing |
| 5 RT | Frequency programming node | Resistor-to-AGND sets fSW from 100 kHz to 2.2 MHz; internally regulated to 0.5 V |
| 6 EN/UVLO/SYNC | Multi-function control pin | Enables device (VEN ≈ 0.52 V), programs UVLO threshold, or accepts external sync clock (negative pulse) |
| 7 AGND | Analog ground reference | Separate ground for error amp and feedback; must connect via short, wide trace to minimize noise coupling |
| 8 COMP | Error amplifier output | Transconductance amplifier (2 mA/V); connects to RC compensation network between COMP and AGND |
| 9 FB | Inverting feedback input | Senses output via resistive divider; referenced to 1.0 V ±1% internal reference |
| 10 SS | Soft-start ramp control | 10-µA current source charges external capacitor; controls output voltage rise time and limits inrush |
| 11 MODE | DRSS & hiccup mode selector | Voltage-programmed (370 mV/620 mV/>1 V) to enable/disable spread spectrum and hiccup protection |
| 12–14 SW | Internal MOSFET drain | Switch node for boost/SEPIC/flyback; handles up to 50-V transients; requires tight layout to PGND |
| 15 NC | No-connect terminal | Internally unconnected; may be tied to PGND for improved thermal conduction |
| EP | Exposed thermal pad | Must be soldered to AGND plane; primary thermal path (RθJC(bot) = 6.7°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Dual Random Spread Spectrum (DRSS) | Reduces peak EMI amplitude by spreading energy across ±7.8% frequency band - no external components required |
| Primary-side regulation (flyback) | Integrated error amplifier eliminates optocoupler and TL431, simplifying isolated design and reducing BOM cost |
| Programmable hiccup-mode overload | 64-cycle fault lockout with 8-cycle reset prevents thermal runaway during sustained overcurrent |
| Accurate line- and temperature-compensated current limit | 6.5-A min limit holds across –40°C to 125°C and full input range - enables consistent power delivery |
| Low-IQ pulse-skipping light-load mode | 670-µA operating current and 2.6-µA shutdown current extend runtime in battery-powered applications |
Applications
| Portable Speaker Power Supply | Holdup Capacitor Charger |
|---|---|
Use Scenario: Powers Class-D audio amplifier from single-cell Li-ion (3.0–4.2 V) while delivering 12–24 V rail for speaker bias. IC Role / Device Role / Timing Role: Non-synchronous boost controller regulating output via FB pin; 2.2-MHz switching enables ultra-compact inductor and ceramic output cap. Use Value: Eliminates need for external MOSFET and gate driver; DRSS suppresses audible noise from inductor vibration and EMI in sensitive audio bands. | Use Scenario: Charges large electrolytic holdup capacitor during AC line presence to sustain downstream 24-V PLC I/O during brief outages. IC Role / Device Role / Timing Role: Boost converter operating from rectified 12–24 V DC bus; uses programmable UVLO to initiate charge only above valid input threshold. Use Value: 45-mΩ rDS(ON) and 6.5-A current limit support high peak charge currents; PGOOD signals full capacitor voltage for system readiness. |
| Piezo Driver Bias Supply | Industrial PLC Auxiliary Rail |
Use Scenario: Generates stable 40–48 V bias for piezoelectric actuators requiring fast, ripple-free voltage slew in precision motion control. IC Role / Device Role / Timing Role: Flyback controller in primary-side regulated topology; uses COMP loop compensation for tight transient response without optocoupler. Use Value: ±1% FB reference and accurate current limit ensure repeatable actuator displacement; 50-V SW rating accommodates piezo back-EMF spikes. | Use Scenario: Provides isolated 5-V or 12-V auxiliary supply for PLC CPU and I/O modules from wide-range 12–48 V DC field bus. IC Role / Device Role / Timing Role: SEPIC converter handling input dips and surges; MODE pin configures hiccup protection to prevent latch-up during short-circuit faults. Use Value: Input transient protection to 50 V and 125°C junction rating ensure reliability in harsh industrial environments; small 3×3 mm footprint saves board space. |
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 |
|---|---|---|---|
| LM51571RTER | Lower 4.33-A peak current limit; identical package, pinout, and feature set | Better suited for lower-power boost designs (<15 W) where thermal headroom is constrained | Select LM51571RTER when full 6.5-A capability is unnecessary and cost optimization is prioritized |
| TPS61088RHLR | Higher 12-A current limit but fixed 500-kHz/1-MHz switching; no DRSS or hiccup mode; 5-V max input | Limited to low-input applications (2.7–5.5 V); unsuitable for 12–48 V industrial or battery-tethered use | Choose TPS61088RHLR only for compact, high-current boost from USB or single Li-Po; not drop-in for LM5157RTER's wide-VIN role |
Compared with LM51571RTER, the LM5157RTER delivers higher peak current for demanding flyback or SEPIC loads; versus TPS61088RHLR, it supports vastly wider input range and advanced EMI/thermal protection - making it the sole choice for ruggedized, high-voltage portable or industrial DC-DC designs.
Availability
LM5157RTER is available at Aetrix Electronics and suitable for portable speaker power supplies, holdup capacitor chargers, piezo driver bias supplies, and industrial PLC auxiliary rails requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM5157RTER 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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.
The LM5157RTER belongs to TI's wide-input DC-DC controller product line, engineered for rugged battery-powered and industrial systems needing flexible topology support, high-voltage resilience, and EMI-compliant operation without external complexity.
FAQ
What is the minimum input voltage required for LM5157RTER to start up?
The LM5157RTER starts up from a minimum 2.9-V input when powered solely from VSUPPLY. However, if the BIAS pin is supplied with ≥2.9 V from an auxiliary source (e.g., output rail or external supply), the device can operate with VSUPPLY as low as 1.5 V - enabling ultra-low-voltage battery backup scenarios. Startup behavior is confirmed in Section 8.1 and Figure 8-2 of the LM5157RTER datasheet.
Does LM5157RTER support primary-side regulation in flyback topology without an optocoupler?
Yes, the LM5157RTER integrates a transconductance error amplifier (Gm = 2 mA/V) and accurate 1.0-V ±1% reference, enabling stable primary-side regulation in flyback converters. This eliminates the need for optocouplers and secondary-side TL431 circuits, reducing component count, cost, and board area - as validated in Figure 9-3 and Section 9.2 of the LM5157RTER datasheet.
How is dual random spread spectrum (DRSS) enabled on LM5157RTER?
DRSS is enabled by setting the MODE pin voltage to either 370 mV (via 37.4-kΩ resistor to AGND) or >1.0 V (via 100-kΩ resistor to AGND) during initial power-up. This activates both triangular and cycle-by-cycle random modulation, reducing peak EMI by ±7.8% frequency dithering. Note: applying an external clock to the EN/UVLO/SYNC pin disables DRSS - per Section 8.3.5 of the LM5157RTER datasheet.
What protection features are integrated into LM5157RTER?
The LM5157RTER includes overvoltage protection (OVP), line undervoltage lockout (UVLO), thermal shutdown (175°C), programmable hiccup-mode overload protection (64-cycle lockout), and accurate peak current limiting. All protections are hardware-based and fully specified across –40°C to 125°C - ensuring robust operation in automotive, industrial, and portable applications per Sections 7.5 and 8.3 of the LM5157RTER datasheet.
Can LM5157RTER synchronize to an external clock signal?
Yes, the EN/UVLO/SYNC pin accepts negative-pulse synchronization signals from 100 kHz to 2.2 MHz, allowing precise timing alignment with other system clocks or noise-sensitive subsystems. When external sync is active, internal DRSS is automatically disabled. The pin also serves dual roles: enable control (VEN ≈ 0.52 V) and programmable UVLO threshold - all detailed in Table 6-1 and Section 8.3.1 of the LM5157RTER datasheet.
LM5157RTER 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):
- 2.9V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 48V
- Current - Output:
- 6.5A (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)
LM5157RTER FAQ
1.How can I place an order for LM5157RTER through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5157RTER 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 LM5157RTER reliable?
The price and inventory of LM5157RTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5157RTER is usually 5 days.
3.What payment methods are accepted for LM5157RTER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5157RTER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5157RTER?
LM5157RTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5157RTER 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 LM5157RTER?
For technical support, including LM5157RTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5157RTER requirements.
6.How does Aetrix verify that LM5157RTER is sourced from the original manufacturer or authorized distributors?
All LM5157RTER 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 LM5157RTER meets industry standards.
7.What is the process for return or replacement of LM5157RTER?
All LM5157RTER units undergo pre-shipment inspection (PSI). If there is an issue with LM5157RTER, 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 LM5157RTER part is unused and in its original packaging.
Return procedure for LM5157RTER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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