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Texas Instruments LM5161QPWPRQ1
- Part No.:
- LM5161QPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5161QPWPRQ1.pdf
- Description:
- IC REG BCK FLYBACK ADJ 14HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM5161QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified 100-V, 1-A synchronous buck/Fly-Buck™ converter with integrated high-side and low-side MOSFETs, constant ON-time control, ±1% feedback reference, and FPWM-selectable CCM/DCM operation - used in automotive IGBT gate drive bias supplies and isolated telecom DC/DC converters.
For engineers reviewing the LM5161QPWPRQ1 datasheet, LM5161QPWPRQ1 pinout, LM5161QPWPRQ1 application, or LM5161QPWPRQ1 equivalent, key selection criteria include input voltage range (4.5–100 V), integrated switch RDS(ON) (0.58 Ω HS / 0.24 Ω LS), thermal shutdown (175°C), FPWM logic interface, and HTSSOP-14 package compatibility with Fly-Buck transformer-coupled designs.
Technical Context
The LM5161QPWPRQ1 implements constant ON-time control with VIN-inversely scaled switching cycle, enabling fast transient response without external loop compensation. Its internal transconductance error amplifier (100 µA/V) and soft-start current source (10 µA) stabilize regulation during startup and load steps.
It integrates dual N-channel MOSFETs (100-V rated), a 7.3-V VCC linear regulator (30-mA current limit), bootstrap gate drive (BST-SW UVLO at 2.93 V), and programmable peak current limiting with VIN- and VFB-dependent off-time (2–21 µs). FPWM pin selects forced CCM for multi-output Fly-Buck or DCM for diode-emulation buck operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 100 V - supports 24 V industrial, 48 V telecom, and 72 V automotive battery systems without pre-regulation. |
| Max Output Current | 1 A - sufficient for IGBT gate drivers, PLC auxiliary rails, and low-power isolated bias supplies (<12 W). |
| Feedback Reference | 2.0 V ±1% - enables precise output regulation across –40°C to 125°C ambient temperature range. |
| Switch RDS(ON) | 0.58 Ω (HS), 0.24 Ω (LS) - reduces conduction loss and eliminates need for external Schottky diode in buck mode. |
| Switching Frequency | Adjustable up to 1 MHz - set via RON resistor; maintains near-constant frequency across line/load variations. |
| Thermal Shutdown | 175°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design in enclosed automotive modules. |
| ESD Rating | HBM ±2000 V, CDM ±750 V - meets AEC-Q100 stress requirements for automotive under-hood environments. |
Pinout & Package
LM5161QPWPRQ1 is housed in a thermally enhanced 14-pin HTSSOP (PWP) package (4.40 mm × 5.00 mm) with exposed pad connected to AGND for improved power dissipation (RθJA = 39.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog Ground | Reference node for internal control circuits; must be low-impedance connection to system analog ground plane. |
| PGND (Pin 2) | Power Ground | Return path for synchronous rectifier FET; requires separate low-inductance trace to minimize switching noise coupling. |
| VIN (Pin 3) | High-Voltage Input | Primary supply rail (4.5–100 V); connects to bulk capacitor and ESD protection; routing must minimize parasitic inductance. |
| EN/UVLO (Pin 4) | Enable & Input UVLO | Logic-enable input with precision 1.24 V threshold and adjustable hysteresis; used for system-level sequencing and brownout protection. |
| RON (Pin 5) | ON-Time Programming | Resistor-to-VIN sets switch ON-time inversely proportional to VIN; determines operating frequency and light-load behavior. |
| SS (Pin 6) | Soft-Start Control | Capacitor-connected node charged by 10-µA current source; controls output ramp rate and limits inrush current during startup. |
| NC (Pin 7) | No Connection | Unbonded pin; must remain floating or tied to AGND per layout guidelines - no signal routing allowed. |
| FPWM (Pin 8) | Forced PWM Mode Select | Logic input: AGND = DCM (diode emulation), VCC = forced CCM - enables Fly-Buck multi-output or tightly regulated buck operation. |
| FB (Pin 9) | Feedback Input | Compares output divider voltage to 2.0 V reference; senses secondary-side voltage in Fly-Buck configurations via optocoupler or transformer winding. |
| VCC (Pin 10) | VCC Bypass | Bypass capacitor node for internal 7.3-V regulator; accepts external 9–13 V bias to reduce power loss in high-VIN applications. |
| BST (Pin 11) | Bootstrap Supply | Connects to SW via 0.1-µF capacitor; provides gate drive voltage for high-side FET; requires low-ESR ceramic capacitor. |
| SW (Pins 12,13) | Switch Node | Drain of high-side FET and source of low-side FET; high dv/dt node requiring tight layout, minimal loop area, and guard ring. |
| NC (Pin 14) | No Connection | Unbonded pin; same handling as Pin 7 - no electrical connection or routing permitted. |
| EP | Exposed Pad | Internally connected to AGND; must be soldered to large copper pour for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side Switches | Eliminates external MOSFETs and Schottky diodes - reduces BOM count and PCB footprint in space-constrained automotive modules. |
| Constant ON-Time Control | Enables stable operation without external compensation components and delivers <100-ns current-limit response for robust short-circuit protection. |
| FPWM-Selectable Conduction Mode | DCM mode improves light-load efficiency (>85% at 10 mA); CCM mode enables isolated Fly-Buck topologies with multiple regulated outputs. |
| Prebias Start-Up Support | Allows safe startup into precharged output capacitors - critical for hot-swap applications in telecom and industrial PLC backplanes. |
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to 125°C ambient operation with HBM ±2 kV and CDM ±750 V - suitable for engine bay and ADAS power supplies. |
Applications
| IGBT Gate Drive Bias Supply | Telecom DC/DC Primary/Secondary Side Bias |
|---|---|
|
Use Scenario: Providing isolated +15 V / –5 V bias rails for high-voltage IGBT half-bridge drivers in EV traction inverters and industrial motor drives. IC Role / Device Role / Timing Role: Primary-side synchronous buck controller implementing Fly-Buck topology with transformer-coupled secondary outputs. Use Value: Integrated switches and FPWM-controlled CCM enable tightly regulated, ripple-free bias rails without optocoupler feedback complexity. |
Use Scenario: Generating isolated 5 V or 3.3 V bias for PoE-powered Ethernet PHYs, line cards, and remote radio units in 48 V telecom infrastructure. IC Role / Device Role / Timing Role: Primary-side flyback-derived controller operating in forced CCM to maintain regulation across wide load and line variations. Use Value: 100-V input rating withstands telecom surge transients; ±1% reference ensures stable PHY clocking and SerDes bias under dynamic loading. |
| Automotive Electronics | Industrial Programmable Logic Controller |
|
Use Scenario: Powering infotainment domain controllers, ADAS camera modules, and body control units directly from 12 V/24 V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary buck regulator with EN/UVLO hysteresis and prebias start-up supporting 4.5 V minimum input during cranking events. Use Value: Wide VIN range and AEC-Q100 qualification ensure uninterrupted operation during automotive load-dump and cold-crank conditions. |
Use Scenario: Delivering 5 V/3.3 V auxiliary power to FPGA-based logic, analog I/O, and communication interfaces in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Isolated Fly-Buck converter supplying multiple isolated rails from 24 V DC bus while meeting IEC 61000-4 immunity standards. Use Value: Integrated current limiting and thermal shutdown protect against field wiring faults; HTSSOP package fits compact DIN-rail enclosure footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck/Fly-Buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5160QPWPRQ1 | Lower 65-V max input; identical pinout and feature set except reduced voltage rating and no FPWM pin. | Suitable only for ≤65 V systems (e.g., 48 V telecom without surge margin); cannot replace LM5161QPWPRQ1 in 72 V automotive or 100 V industrial inputs. | Select when input stays below 65 V and Fly-Buck CCM operation is not required - lower cost but no FPWM flexibility. |
| UCC28740DR | PSR flyback controller (no integrated FETs); requires external MOSFET and transformer; no synchronous rectification. | Used in higher-isolation, lower-noise applications where primary-side regulation suffices; lacks integrated switches and Fly-Buck simplicity. | Choose for >5 kV isolation or ultra-low standby power; avoid if board space, BOM count, or Fly-Buck simplicity are priorities. |
Compared with LM5160QPWPRQ1 and UCC28740DR, LM5161QPWPRQ1 uniquely combines 100-V operation, integrated dual FETs, FPWM-selectable conduction modes, and AEC-Q100 Grade 1 qualification - making it the only option for automotive-grade, compact, isolated Fly-Buck bias supplies requiring full input voltage margin and design flexibility.
Availability
LM5161QPWPRQ1 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom DC/DC bias supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LM5161QPWPRQ1 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 for automotive, industrial, and communications markets.
The LM5161QPWPRQ1 belongs to TI's automotive-qualified wide-input DC/DC converter product line, designed specifically for high-reliability isolated and non-isolated power conversion in harsh environments - including engine control, ADAS, and industrial automation.
FAQ
What is the maximum input voltage rating for LM5161QPWPRQ1?
The LM5161QPWPRQ1 supports a maximum input voltage of 100 V, verified per Absolute Maximum Ratings in the official datasheet (SNVSAF9A). This allows direct operation from 72 V industrial buses and 48 V telecom lines with surge margin, and accommodates automotive cold-crank and load-dump transients without external clamping.
Does LM5161QPWPRQ1 require external compensation components?
No, LM5161QPWPRQ1 uses constant ON-time control architecture and does not require external loop compensation components. Its internal transconductance error amplifier (100 µA/V) and soft-start capacitor provide inherent stability - confirmed in Section 7.3.5 of the datasheet and validated across all recommended operating conditions.
How does the FPWM pin affect LM5161QPWPRQ1 operation?
The FPWM pin on LM5161QPWPRQ1 selects conduction mode: grounding it enables DCM for high-efficiency light-load buck operation; connecting it to VCC forces CCM for stable multi-output Fly-Buck applications. This behavior is explicitly defined in Section 7.3.1 and Figure 12 of the LM5161QPWPRQ1 datasheet.
What package type and thermal performance does LM5161QPWPRQ1 use?
LM5161QPWPRQ1 uses a 14-pin HTSSOP (PWP) package with 4.40 mm × 5.00 mm body and exposed pad. Its junction-to-ambient thermal resistance is 39.3°C/W, and junction-to-case (bottom) is 2.0°C/W - values measured and published in Section 6.4 of the official datasheet for the PWP variant.
Is LM5161QPWPRQ1 qualified for automotive applications?
Yes, LM5161QPWPRQ1 is AEC-Q100 Grade 1 qualified (-40°C to +125°C ambient), with documented results for HBM ESD (±2000 V) and CDM ESD (±750 V). This qualification is stated in Section 1 (Features) and Section 4 (Revision History) of the SNVSAF9A datasheet.
LM5161QPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Buck, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 92V
- Current - Output:
- 1A
- Frequency - Switching:
- 50kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM5161QPWPRQ1 FAQ
1.How can I place an order for LM5161QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5161QPWPRQ1 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 LM5161QPWPRQ1 reliable?
The price and inventory of LM5161QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5161QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM5161QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5161QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5161QPWPRQ1?
LM5161QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5161QPWPRQ1 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 LM5161QPWPRQ1?
For technical support, including LM5161QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5161QPWPRQ1 requirements.
6.How does Aetrix verify that LM5161QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM5161QPWPRQ1 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 LM5161QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM5161QPWPRQ1?
All LM5161QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM5161QPWPRQ1, 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 LM5161QPWPRQ1 part is unused and in its original packaging.
Return procedure for LM5161QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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