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Texas Instruments LM5169FQDDARQ1
- Part No.:
- LM5169FQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5169FQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 650MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,277
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Product details
Overview
LM5169FQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter with integrated 1.9-Ω high-side and 0.71-Ω low-side NFETs, delivering up to 0.65-A output current across 6 V–120 V input range, supporting FPWM mode for isolated Fly-Buck™ converter operation in battery management systems and 48-V HEV/EV power rails.
For engineers reviewing the LM5169FQDDARQ1 datasheet, LM5169FQDDARQ1 pinout, LM5169FQDDARQ1 application, or LM5169FQDDARQ1 equivalent, key selection criteria include its 50 ns minimum on/off time, 3-µA shutdown IQ, 1.2-V internal reference, FPWM-forced CCM capability, and SO PowerPAD™ package thermal performance in high-voltage automotive environments.
Technical Context
The LM5169FQDDARQ1 implements a constant-on-time (COT) control architecture with VIN feed-forward to maintain quasi-fixed switching frequency up to 1 MHz, enabling fast transient response and stable regulation across wide input voltage swings. Its FPWM mode enforces continuous conduction across all load conditions, essential for reliable isolated Fly-Buck™ secondary output generation.
Integrated protection includes peak/valley current limiting (0.84-A peak, 0.672-A valley), input UVLO with programmable threshold (1.45–1.55 V enable), thermal shutdown at 175°C with 10°C hysteresis, and fixed 3-ms internal soft-start. The device operates from –40°C to +150°C junction temperature and supports monotonic start-up into prebiased loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 120 V - enables direct step-down from 48-V nominal or ≥10-S battery packs without external surge suppression. |
| Output Current | 0.65 A - sufficient for powering microcontrollers, sensors, and gate drivers in BMS and ADAS subsystems. |
| Switching Frequency | Up to 1 MHz - allows compact magnetics and reduced EMI filtering in space-constrained automotive modules. |
| Quiescent Current | <10 µA in auto mode - preserves battery life during vehicle sleep modes without compromising wake-up responsiveness. |
| Min On/Off Time | 50 ns - supports ultra-high step-down ratios (e.g., 48 V → 3.3 V) and near-100% duty cycle operation during cold-crank dips. |
| Reference Voltage | 1.2 V ±1.5% - provides precise output regulation stability over temperature and line/load variations. |
| Shutdown IQ | 3 µA - ensures minimal parasitic drain during system off-state, critical for always-on automotive domains. |
Pinout & Package
LM5169FQDDARQ1 is housed in an 8-pin SOIC PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to GND for enhanced thermal dissipation (RθJB = 14.1°C/W). The package supports 1.27-mm pin pitch for high-voltage creepage compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return path for internal circuits and thermal pad connection point; must be tied to large copper plane. |
| 2 VIN | Power input | Direct connection to 6–120 V supply; powers high-side FET and internal VCC regulator; requires low-impedance layout. |
| 3 EN/UVLO | Enable & UVLO control | Programmable startup threshold (1.45–1.55 V rising); enables precision undervoltage lockout and standby mode entry. |
| 4 RT | On-time programming | Resistor-to-GND sets COT pulse width; determines switching frequency in CCM; min RT ensures ≥50 ns on-time at 120 V. |
| 5 FB | Voltage feedback | Compares output against 1.2-V internal reference; requires ≥20 mV ripple for COT loop stability. |
| 6 PGOOD | Open-drain status indicator | Signals valid regulation (1.105–1.175 V FB rising threshold); used for power-rail sequencing and fault reporting. |
| 7 BST | Bootstrap supply | Connects 2.2-nF X7R ceramic capacitor to SW; biases high-side gate driver; internal diode recharges BST during low-SW phase. |
| 8 SW | Switching node | Internal connection between high-side FET source and low-side FET drain; drives external inductor; high dv/dt node requiring careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM mode | Forces CCM across full load range, enabling stable isolated Fly-Buck™ secondary output generation without output collapse. |
| Integrated power FETs | 1.9-Ω HS and 0.71-Ω LS NFETs eliminate external MOSFETs and drivers, reducing BOM count and PCB area by >30% vs discrete solutions. |
| Ultra-low shutdown IQ | 3 µA - meets automotive OEM requirements for sub-5-µA system standby current in always-on domains like telematics. |
| Smart current limiting | Peak (0.84 A) + valley (0.672 A) detection with hiccup recovery - prevents thermal runaway during sustained short-circuit on primary or secondary outputs. |
| COT control with no compensation | Eliminates external loop compensation components (RC networks), simplifying design and improving reliability across temperature and aging. |
Applications
| Automotive Battery Management System (BMS) | 48-V HEV/EV Domain Controller Power Supply |
|---|---|
|
Use Scenario: Regulating 3.3-V/5-V rails from 48-V traction battery or 12-V auxiliary bus in cell monitoring units and pack controllers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing isolated auxiliary power via Fly-Buck™ topology for isolated CAN transceivers and ADC references. Use Value: 50 ns min on-time enables direct 48 V → 3.3 V conversion; FPWM mode ensures stable secondary output under dynamic load steps typical in cell voltage sampling. |
Use Scenario: Powering domain controllers (e.g., ADAS ECUs, gateway modules) requiring clean, regulated 5-V/3.3-V supplies from 48-V main bus. IC Role / Device Role / Timing Role: High-efficiency primary DC/DC stage with auto-mode diode emulation for >90% light-load efficiency during vehicle idle states. Use Value: <10 µA quiescent current extends battery hold-up time; 120-V abs max rating withstands load-dump transients per ISO 7637-2. |
| Industrial High-Cell-Count Battery Packs | e-Bike/E-Scooter Motor Control Power Stage |
|
Use Scenario: Generating gate-driver and MCU supplies from ≥10-S lithium-ion packs (up to 42 V nominal, 48 V max). IC Role / Device Role / Timing Role: Wide-input buck converter operating down to 6 V to sustain regulation during deep discharge and cold-crank events. Use Value: Near-100% duty cycle capability maintains output during low-VIN dips; thermal shutdown (175°C) protects against motor stall-induced overheating. |
Use Scenario: Providing isolated logic supply for BLDC inverter gate drivers and Hall sensor interfaces in e-mobility applications. IC Role / Device Role / Timing Role: Fly-Buck™ converter generating both non-isolated 5-V MCU rail and isolated 12-V gate-drive supply from single 36-V battery input. Use Value: Integrated BST diode and 2.2-nF bootstrap cap requirement simplify layout; hiccup protection recovers cleanly after motor stall overcurrents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5169PQDDARQ1 | Auto-mode (PFM/DEM) instead of FPWM; 0.84-A hiccup current limit vs same peak/valley thresholds. | Better light-load efficiency but lacks forced CCM; unsuitable for Fly-Buck™ isolation where secondary output stability is required. | Select LM5169PQDDARQ1 only when ultra-low IQ (<10 µA) dominates over isolated output needs. |
| LM5164FQDDARQ1 | Lower 0.3-A output current; identical FPWM mode, pinout, and Fly-Buck™ capability; shares same SO PowerPAD™ package. | Matches LM5169FQDDARQ1 functionality for lower-power subsystems (e.g., sensor hubs), but cannot support >0.3-A loads. | Use LM5164FQDDARQ1 as drop-in replacement only if output current demand is ≤0.3 A and thermal margin permits. |
Compared with LM5169PQDDARQ1, LM5169FQDDARQ1 guarantees CCM operation for isolated Fly-Buck™ use cases, while LM5164FQDDARQ1 offers identical FPWM behavior at reduced current capacity-making LM5169FQDDARQ1 the sole choice for 0.65-A automotive primary/secondary power delivery requiring robust transient immunity and thermal resilience.
Availability
LM5169FQDDARQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, 48-V HEV/EV domain controllers, industrial high-cell-count battery packs, and e-bike/e-scooter motor control systems requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for LM5169FQDDARQ1 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 and embedded processing technologies, with decades of automotive-grade product development and AEC-Q100 validation expertise.
The LM516x-Q1 product line was designed specifically for high-reliability automotive and industrial DC/DC conversion, targeting wide-input, high-step-down, and isolated Fly-Buck™ applications in battery-powered and harsh-environment systems.
FAQ
What distinguishes LM5169FQDDARQ1 from LM5169PQDDARQ1?
The LM5169FQDDARQ1 is factory-configured for FPWM (forced pulse-width modulation) mode, ensuring continuous conduction across all load conditions-critical for stable Fly-Buck™ isolated output generation. In contrast, LM5169PQDDARQ1 uses auto mode with diode emulation and PFM, achieving lower light-load IQ (<10 µA) but losing CCM guarantee. Both share identical pinout, package, and protection features, but only LM5169FQDDARQ1 supports reliable secondary-side regulation under dynamic loads.
Does LM5169FQDDARQ1 support Fly-Buck™ converter topology?
Yes, LM5169FQDDARQ1 explicitly supports Fly-Buck™ operation through its FPWM mode, which maintains continuous conduction regardless of load. This prevents secondary output collapse during light-load conditions-a known failure mode in PFM-based buck converters. The device's 50 ns minimum on/off time, integrated BST circuit, and hiccup-protected current limiting ensure robust dual-output (isolated + non-isolated) performance in automotive BMS and gate-driver applications.
What is the maximum input voltage rating for LM5169FQDDARQ1?
The absolute maximum input voltage rating for LM5169FQDDARQ1 is 120 V, with recommended operating range from 6 V to 115 V. This rating allows direct interface with 48-V automotive systems, high-cell-count battery packs (≥10 S Li-ion), and industrial 24–48-V rails while surviving load-dump transients per ISO 7637-2. Operation at 120 V is limited to short-duration transients; sustained operation above 115 V risks exceeding thermal limits.
How does the LM5169FQDDARQ1 achieve ultra-low quiescent current?
LM5169FQDDARQ1 achieves 3 µA shutdown IQ by disabling all switching and bias circuits except the EN/UVLO comparator and internal VCC LDO during shutdown. In FPWM active mode, it draws 420–880 µA (typical), but enters ultra-low IQ state only in auto-mode variants-not LM5169FQDDARQ1. For LM5169FQDDARQ1, low IQ is maintained via optimized gate drive and integrated regulators, not diode emulation, prioritizing CCM stability over sub-10-µA light-load operation.
Is LM5169FQDDARQ1 pin-compatible with other LM516x-Q1 devices?
Yes, LM5169FQDDARQ1 is pin-to-pin compatible with LM5164FQDDARQ1, LM5163-Q1, LM5017, LM5013-Q1, and LM34927 per TI documentation. All share the same 8-pin SO PowerPAD™ footprint, identical pin functions (VIN, SW, BST, etc.), and matching thermal pad layout. This enables hardware reuse across power levels-from 0.3-A (LM5164) to 0.65-A (LM5169)-with only RT resistor and output filter adjustments needed for frequency and current scaling.
LM5169FQDDARQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6V
- Voltage - Input (Max):
- 120V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 120V
- Current - Output:
- 650mA
- Frequency - Switching:
- 100kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM5169FQDDARQ1 FAQ
1.How can I place an order for LM5169FQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5169FQDDARQ1 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 LM5169FQDDARQ1 reliable?
The price and inventory of LM5169FQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5169FQDDARQ1 is usually 5 days.
3.What payment methods are accepted for LM5169FQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5169FQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5169FQDDARQ1?
LM5169FQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5169FQDDARQ1 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 LM5169FQDDARQ1?
For technical support, including LM5169FQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5169FQDDARQ1 requirements.
6.How does Aetrix verify that LM5169FQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LM5169FQDDARQ1 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 LM5169FQDDARQ1 meets industry standards.
7.What is the process for return or replacement of LM5169FQDDARQ1?
All LM5169FQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM5169FQDDARQ1, 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 LM5169FQDDARQ1 part is unused and in its original packaging.
Return procedure for LM5169FQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5169FQDDARQ1 Tags
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