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Texas Instruments LM5161QPWPTQ1
- Part No.:
- LM5161QPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM5161QPWPTQ1.pdf
- Description:
- IC REG BCK FLYBACK ADJ 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:481
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Product details
Overview
LM5161QPWPTQ1 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 LM5161QPWPTQ1 datasheet, LM5161QPWPTQ1 pinout, LM5161QPWPTQ1 application, or LM5161QPWPTQ1 equivalent, key selection considerations include its 4.5–100 V input range, HTSSOP-14 package thermal performance (RθJA = 39.3°C/W), FPWM-mode flexibility for Fly-Buck vs. buck topologies, integrated current limiting (1.3–1.9 A high-side ILIM), and automotive-grade reliability (–40°C to 125°C TA).
Technical Context
The LM5161QPWPTQ1 implements constant ON-time control with VIN-inversely proportional on-time programming via RON, enabling fast transient response without external loop compensation. Its internal transconductance error amplifier (GM = 100 µA/V) and soft-start circuit (10 µA charge current) stabilize regulation during startup and load steps.
It integrates dual N-channel MOSFETs (RDS(ON) = 0.58 Ω HS / 0.24 Ω LS), a 7.3-V internal VCC regulator (30 mA current limit), and programmable UVLO (1.24 V threshold, 50 mV hysteresis) with independent EN/UVLO pin logic. FPWM pin selection determines CCM operation (for multi-output Fly-Buck) or DCM (for ripple-free buck output without external injection).
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 PoE+ systems without pre-regulation. |
| Output Current | 1 A maximum - sufficient for IGBT gate drivers, PLC auxiliary rails, and low-power isolated bias supplies. |
| Feedback Reference | 2.0 V ±1% - enables precise output voltage setting (e.g., 3.3 V, 5 V, 12 V) with standard resistor dividers. |
| Switching Frequency | Up to 1 MHz - adjustable via RON; typical 300 kHz at VIN = 48 V, RON = 402 kΩ for 12 V output. |
| Thermal Protection | 175°C shutdown with 20°C hysteresis - prevents latch-up during overload or poor PCB heatsinking. |
| ESD Rating | HBM ±2000 V, CDM ±750 V - meets AEC-Q100 stress requirements for automotive under-hood environments. |
| Operating Temperature | –40°C to 125°C ambient - qualified per AEC-Q100 Grade 1 for engine control, ADAS, and body electronics. |
Pinout & Package
LM5161QPWPTQ1 is housed in a thermally enhanced 14-pin HTSSOP (PWP) package (4.40 mm × 5.00 mm) with exposed pad (EP) tied to AGND for improved power dissipation (RθJCbot = 2.0°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return for internal control circuits; must be separated from PGND and connected to EP for noise immunity. |
| PGND (Pin 2) | Power ground return | Source node for low-side FET; connects to power plane under SW/BST path to minimize switching loop inductance. |
| VIN (Pin 3) | Main input supply | Accepts 4.5–100 V; requires local ceramic input capacitor (≥10 µF) near VIN-PGND pins. |
| EN/UVLO (Pin 4) | Enable & input UVLO input | Active-high logic; 1.24 V threshold with 50 mV hysteresis - enables programmable undervoltage lockout. |
| 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 to AGND (≥1 nF) controls output rise time and limits inrush; charged by 10 µA internal current source. |
| NC (Pin 7) | No connection | Not bonded; must remain unconnected and floating. |
| FPWM (Pin 8) | Forced PWM mode select | Ground = DCM (diode emulation); VCC = CCM - selects Fly-Buck capability or ripple-free buck regulation. |
| FB (Pin 9) | Feedback input | Compares output divider voltage to 2.0 V reference; sink/source current ≤100 nA ensures high-impedance sensing. |
| VCC (Pin 10) | Bias regulator output | 7.3 V internal LDO (30 mA limit); bypass with ≥1 µF ceramic cap; can be externally biased (9–13 V) to reduce dissipation. |
| BST (Pin 11) | Bootstrap supply | Connects BST–SW capacitor (≥0.1 µF) to drive high-side FET gate above VIN; internal diode recharges during SW low phase. |
| SW (Pins 12,13) | Switch node | Drain of HS FET / source of LS FET; high dv/dt node requiring tight layout and minimal trace area to reduce EMI. |
| NC (Pin 14) | No connection | Not bonded; must remain unconnected and floating. |
| EP | Exposed thermal pad | Internally connected to AGND; must be soldered to large PCB copper area for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFETs | Eliminates external Schottky diode and reduces BOM count - RDS(ON) = 0.58 Ω (HS) / 0.24 Ω (LS) minimizes conduction loss at 1 A. |
| Constant ON-time control | Enables fast load-step response (<10 µs recovery) without external compensation components - simplifies design for dynamic loads. |
| FPWM-selectable conduction mode | DCM mode (FPWM = GND) delivers tightly regulated buck output without external ripple injection; CCM mode (FPWM = VCC) enables Fly-Buck isolation. |
| Programmable soft-start | 10 µA internal current source charges SS capacitor - prevents output overshoot and inrush into capacitive loads (e.g., downstream LDOs). |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to 125°C), HBM ±2kV, CDM ±750V - validated for safety-critical vehicle subsystems including ADAS and powertrain. |
| Internal VCC regulator | 7.3 V LDO with 30 mA limit - powers gate drivers and logic; external VCC bias (9–13 V) reduces thermal stress in high-VIN applications (e.g., 72 V battery transients). |
Applications
| IGBT Gate Drive Bias Supply | Telecom DC/DC Primary/Secondary Side Bias |
|---|---|
Use Scenario: Provides isolated 12-V/0.5-A bias rail for high-side IGBT drivers in automotive traction inverters or industrial motor drives. IC Role / Device Role / Timing Role: Synchronous buck controller implementing Fly-Buck topology with CCM forced via FPWM = VCC to maintain regulation across wide input transients (45–90 V). Use Value: Eliminates need for optocoupler feedback or secondary-side regulation - achieves <±3% output accuracy over temperature using primary-side sensing. |
Use Scenario: Generates 5-V/1-A auxiliary supply from 48-V telecom rectified bus for DSP, PHY, and management ICs on line cards. IC Role / Device Role / Timing Role: Buck converter operating in DCM (FPWM = GND) to maintain >85% efficiency at 10% load while suppressing output ripple without external injection. Use Value: Delivers clean, low-noise 5-V rail meeting GR-63-CORE EMI requirements - no additional LC filter needed due to inherent DCM ripple suppression. |
| Industrial Programmable Logic Controller | Automotive Electronics |
Use Scenario: Powers 3.3-V FPGA core and 5-V I/O rails in DIN-rail mounted PLCs fed from 24-V DC field supply with surge tolerance. IC Role / Device Role / Timing Role: Primary buck regulator with UVLO hysteresis (50 mV) and thermal shutdown (175°C) ensuring robust operation during brownouts and ambient spikes up to 70°C. Use Value: Maintains stable 3.3-V output under 24-V input dips to 18 V - critical for deterministic PLC scan timing and watchdog reset prevention. |
Use Scenario: Supplies 12-V/0.3-A bias for camera module power management ICs in rear-view ADAS systems. IC Role / Device Role / Timing Role: Automotive-qualified buck converter operating in CCM mode (FPWM = VCC) to support low-noise, ripple-sensitive image sensor analog front-ends. Use Value: Achieves <15 mVpp output ripple at full load - prevents clock jitter and pixel noise in 12-MP CMOS image sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5160QPWPTQ1 | Same architecture but 65-V max input (vs. 100 V); identical pinout, FPWM, and RON programming; lower thermal rating (RθJA = 42.5°C/W). | Suitable for 24/48-V systems only; not rated for 72-V automotive cold-crank or 100-V industrial surges. | Select LM5160QPWPTQ1 only when input never exceeds 65 V and board-level thermal margin allows higher junction temperature. |
| LM5017MRX/NOPB | 75-V input, 600-mA output, SO PowerPAD; no FPWM pin; fixed 500-kHz frequency; requires external compensation. | Lacks Fly-Buck capability and programmable conduction mode; limited to non-isolated buck with lower current capacity. | Choose LM5017MRX/NOPB for cost-sensitive, lower-current 24-V applications where Fly-Buck is unnecessary and layout space permits SOIC-8. |
Compared with LM5160QPWPTQ1 and LM5017MRX/NOPB, LM5161QPWPTQ1 uniquely supports 100-V input with 1-A output and FPWM-selectable CCM/DCM - making it the only option among the three for automotive 72-V cold-crank compliance and isolated Fly-Buck designs.
Availability
LM5161QPWPTQ1 is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and telecom DC/DC primary/secondary side bias applications requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LM5161QPWPTQ1 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 designing analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The LM5161QPWPTQ1 belongs to TI's automotive-qualified wide-input DC/DC converter product line, engineered specifically for high-voltage, isolated, and safety-critical power conversion in vehicles and ruggedized industrial equipment.
FAQ
What is the maximum input voltage rating for LM5161QPWPTQ1?
The LM5161QPWPTQ1 has an absolute maximum input voltage rating of 100 V applied between VIN and AGND. Its recommended operating input range is 4.5 V to 100 V, enabling direct operation from 24-V, 48-V, and 72-V automotive or industrial buses without pre-regulation. This 100-V rating supports cold-crank events in automotive Grade 1 applications.
How does the FPWM pin affect LM5161QPWPTQ1 operation?
The FPWM pin on LM5161QPWPTQ1 selects conduction mode: connecting FPWM to AGND enables discontinuous conduction mode (DCM) with diode emulation for ripple-free buck regulation at light loads; connecting FPWM to VCC forces continuous conduction mode (CCM) across all loads, enabling multi-output Fly-Buck™ isolated topologies. This pin directly configures the device's fundamental operating architecture.
Can LM5161QPWPTQ1 be used in Fly-Buck™ configurations?
Yes, LM5161QPWPTQ1 supports Fly-Buck™ isolated DC/DC conversion when configured in forced CCM mode (FPWM = VCC). In this mode, the transformer-coupled secondary output is regulated via primary-side sensing, eliminating the need for optocouplers or secondary-side feedback. The device's integrated high- and low-side MOSFETs and constant ON-time control ensure stable cross-regulation across multiple outputs.
What thermal performance metrics apply to LM5161QPWPTQ1 in HTSSOP package?
LM5161QPWPTQ1 in the PWP (HTSSOP-14) package has RθJA = 39.3°C/W (junction-to-ambient), RθJCbot = 2.0°C/W (junction-to-case bottom), and ψJB = 19.3°C/W (junction-to-board). These values assume proper PCB layout with the exposed pad (EP) soldered to a ≥100 mm² copper area - critical for maintaining TJ ≤ 125°C at 1-A load in 70°C ambient.
Is LM5161QPWPTQ1 qualified for automotive applications?
Yes, LM5161QPWPTQ1 is AEC-Q100 Grade 1 qualified, with device temperature range –40°C to 125°C ambient, HBM ESD rating ±2000 V, and CDM ESD rating ±750 V. It is explicitly designed for automotive electronics including ADAS camera modules, body control units, and infotainment power supplies - with full production data sheet validation per automotive reliability standards.
LM5161QPWPTQ1 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
LM5161QPWPTQ1 FAQ
1.How can I place an order for LM5161QPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5161QPWPTQ1 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 LM5161QPWPTQ1 reliable?
The price and inventory of LM5161QPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5161QPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM5161QPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5161QPWPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5161QPWPTQ1?
LM5161QPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5161QPWPTQ1 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 LM5161QPWPTQ1?
For technical support, including LM5161QPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5161QPWPTQ1 requirements.
6.How does Aetrix verify that LM5161QPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM5161QPWPTQ1 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 LM5161QPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM5161QPWPTQ1?
All LM5161QPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM5161QPWPTQ1, 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 LM5161QPWPTQ1 part is unused and in its original packaging.
Return procedure for LM5161QPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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