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Texas Instruments LM5169PQDDARQ1
- Part No.:
- LM5169PQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5169PQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 650MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,361
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Product details
Overview
LM5169PQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 0.65 A output current, operating from 6 V to 120 V input, featuring FPWM mode for Fly-Buck™ isolated dual-output capability, integrated 1.9-Ω high-side and 0.71-Ω low-side NFETs, and fixed 3-ms soft-start - deployed in HEV/EV battery management systems and high-cell-count e-bike power supplies.
For engineers reviewing the LM5169PQDDARQ1 datasheet, LM5169PQDDARQ1 pinout, LM5169PQDDARQ1 application, or LM5169PQDDARQ1 equivalent, key selection considerations include its 50 ns minimum on/off time enabling 48-V-to-3.3-V direct step-down, FPWM-mode CCM operation for fly-buck isolation, <10 µA auto-mode quiescent current, and SOIC PowerPAD™ thermal performance with exposed pad grounding.
Technical Context
The LM5169PQDDARQ1 implements a constant-on-time (COT) control architecture with VIN feed-forward to maintain quasi-fixed switching frequency across 6–120 V input range; on-time is set by external RT resistor and inversely proportional to VIN, supporting up to 1 MHz operation with 50 ns minimum pulse width.
It integrates both high-side and low-side NFETs (1.9 Ω / 0.71 Ω), supports two operational modes - FPWM (forced continuous conduction for fly-buck) and auto-mode (diode emulation + ultra-low IQ <10 µA) - and includes peak/valley current limiting, thermal shutdown at 175°C, and open-drain PGOOD with 1.08 V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 120 V - enables direct regulation from 48-V automotive bus or ≥10S Li-ion packs without pre-regulator. |
| Output Current | 0.65 A - sufficient for powering MCU cores, CAN transceivers, and sensor interfaces in BMS modules. |
| Switching Frequency | Up to 1 MHz - allows compact magnetics and reduced EMI filtering in space-constrained EV ECUs. |
| Min On/Off Time | 50 ns - supports >10:1 step-down ratios (e.g., 48 V → 3.3 V) while maintaining stability and duty-cycle headroom. |
| Quiescent Current | <10 µA in auto mode - extends standby runtime in always-on vehicle subsystems without draining 12-V auxiliary battery. |
| Fly-Buck Capability | FPWM mode only - ensures CCM operation required for coupled-inductor isolated secondary output generation. |
| Thermal Shutdown | 175°C with 10°C hysteresis - protects against sustained overload or poor PCB heatsinking in under-hood environments. |
| Feedback Reference | 1.2 V ±1.5% - enables precise output regulation with standard resistor-divider networks for common rail voltages. |
Pinout & Package
LM5169PQDDARQ1 uses an 8-pin SOIC PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad (EP) soldered to GND for enhanced thermal dissipation in automotive under-hood applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return for internal circuits and EP connection point; must be tied to large copper pour for thermal and noise control. |
| VIN (Pin 2) | Power input | Direct connection to 6–120 V supply; requires low-impedance path to minimize voltage spikes during high di/dt switching. |
| EN/UVLO (Pin 3) | Enable & UVLO control | 1.5 V enable threshold enables programmable undervoltage lockout; 1.1 V standby entry preserves bias regulator functionality. |
| RT (Pin 4) | On-time programming | Resistor-to-GND sets COT on-time; determines switching frequency in CCM and ensures ≥50 ns minimum pulse width. |
| FB (Pin 5) | Feedback input | Monitors output via resistor divider; compares to 1.2 V reference to regulate VOUT; requires ≥20 mV ripple for COT stability. |
| PGOOD (Pin 6) | Open-drain status indicator | Signals valid regulation (1.08–1.14 V FB window); requires external 10–100 kΩ pull-up for power-rail sequencing or fault reporting. |
| BST (Pin 7) | Bootstrap supply | Connects 2.2-nF X7R ceramic capacitor to SW; powers high-side gate driver; improper sizing risks VCC regulator overstress. |
| SW (Pin 8) | Switching node | Internal connection between HS-FET source and LS-FET drain; routes to power inductor; critical for EMI layout and snubber design. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 1.9-Ω HS and 0.71-Ω LS NFETs eliminate external MOSFETs and drivers, reducing BOM count and layout complexity. |
| FPWM Mode Support | Forced CCM across full load range enables stable Fly-Buck™ isolated secondary output generation without regulation loss. |
| Ultra-Low IQ Auto Mode | <10 µA quiescent current extends battery life in always-on automotive modules such as telematics or ADAS sensors. |
| Robust Protection Suite | Peak/valley current limit, input UVLO, thermal shutdown, hiccup-mode overcurrent recovery, and monotonic start-up into prebiased loads. |
| COT Control Architecture | No external compensation required; fast transient response with predictive on-time pulses and inherent line/feed-forward stability. |
| AEC-Q100 Grade 1 | Qualified for –40°C to +125°C ambient operation - meets stringent reliability requirements for engine bay and battery pack mounting. |
Applications
| Battery Management System (BMS) | 48-V Automotive Telematics Module |
|---|---|
|
Use Scenario: Regulating 3.3-V and 5-V rails from a 48-V traction battery pack in electric vehicle battery monitoring units. IC Role / Device Role / Timing Role: Primary synchronous buck controller providing isolated auxiliary outputs via Fly-Buck™ topology for communication ICs and analog front-ends. Use Value: Eliminates need for separate isolated DC/DC; 50 ns min on-time enables direct 48-V-to-3.3-V conversion; FPWM mode ensures stable secondary regulation under dynamic load. |
Use Scenario: Powering LTE/CAN/FPGA subsystems in connected vehicle telematics control units operating from 48-V vehicle bus. IC Role / Device Role / Timing Role: Main step-down regulator delivering 1.2-V core and 3.3-V I/O rails with strict low-noise and fast transient requirements. Use Value: COT architecture delivers sub-100-µs load transient response; integrated FETs reduce footprint; SOIC PowerPAD™ maintains junction temp <125°C at 0.65-A load. |
| E-Bike Battery Pack Interface | Industrial High-Cell-Count Energy Storage |
|
Use Scenario: Generating system rails from 52-V nominal e-bike battery (13S Li-ion) with cold-cranking support down to 6 V. IC Role / Device Role / Timing Role: Input-tolerant buck converter sustaining operation during motor startup voltage sag; provides regulated 5-V USB and 3.3-V MCU supply. Use Value: 6–120 V input range accommodates full battery discharge curve; 3-ms soft-start prevents inrush into capacitive loads; hiccup protection guards against shorted USB ports. |
Use Scenario: Powering monitoring and balancing circuitry in 24S–32S industrial lithium battery racks used in UPS and grid storage systems. IC Role / Device Role / Timing Role: Centralized auxiliary supply converting high-voltage battery string voltage to isolated 12-V and 5-V rails for microcontrollers and optocouplers. Use Value: Fly-Buck™ capability eliminates need for separate isolated converters; AEC-Q100 qualification ensures long-term reliability in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5169FQDDARQ1 | Same 0.65-A rating and FPWM mode, but factory-configured for hiccup overcurrent protection instead of auto-mode PFM. | Preferred where secondary-side overload recovery must be guaranteed (e.g., Fly-Buck™ with unregulated secondary loads). | Select LM5169FQDDARQ1 when hiccup-mode fault handling is required; LM5169PQDDARQ1 is optimal for ultra-low-IQ standby operation. |
| LM5164PQDDARQ1 | Lower 0.3-A output, same package and FPWM/auto-mode options; shares pinout but differs in current-limit thresholds (0.42 A vs. 0.84 A). | Suitable for lower-power domains like sensor hubs or CAN nodes where 0.65-A headroom is unnecessary. | Choose LM5164PQDDARQ1 for cost-sensitive, lower-current applications; LM5169PQDDARQ1 provides necessary headroom for BMS host processors. |
Compared with LM5169FQDDARQ1, LM5169PQDDARQ1 offers superior light-load efficiency via auto-mode PFM but lacks hiccup recovery; versus LM5164PQDDARQ1, it doubles output current capacity and increases current-limit margin - critical for BMS processor rail stability during cell balancing surges.
Availability
LM5169PQDDARQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, 48-V telematics modules, and high-cell-count e-bike power supplies requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM5169PQDDARQ1 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 technologies, with decades of automotive-grade product development and manufacturing excellence.
LM5169PQDDARQ1 belongs to TI's automotive-grade wide-input buck converter family, designed specifically for HEV/EV power architectures requiring high-voltage tolerance, functional safety readiness, and robust operation in harsh thermal environments.
FAQ
What is the maximum input voltage rating for LM5169PQDDARQ1?
The LM5169PQDDARQ1 has an absolute maximum input voltage rating of 120 V on the VIN pin, with recommended operating range from 6 V to 115 V. This wide range supports direct regulation from 48-V automotive buses, high-cell-count battery packs (e.g., 13S Li-ion), and industrial 24/48-V systems without external surge suppression components.
Does LM5169PQDDARQ1 support isolated Fly-Buck™ converter topologies?
Yes, LM5169PQDDARQ1 supports Fly-Buck™ operation exclusively in FPWM mode, which enforces continuous conduction mode across all load conditions - a requirement for stable coupled-inductor isolated secondary output regulation. Auto-mode disables FPWM and is unsuitable for Fly-Buck™ configurations.
What is the purpose of the EN/UVLO pin on LM5169PQDDARQ1?
The EN/UVLO pin on LM5169PQDDARQ1 serves dual functions: precision enable control (1.5 V rising threshold initiates startup) and programmable undervoltage lockout (1.1 V rising threshold enables standby mode with internal VCC regulator active but no switching). This allows flexible system-level power sequencing and brownout protection.
How does the COT control architecture improve transient response in LM5169PQDDARQ1?
The constant-on-time (COT) architecture in LM5169PQDDARQ1 delivers near-instantaneous load transient response by generating predictive on-pulses based on feedback error - eliminating traditional loop compensation delays. During rapid load steps, it minimizes off-time to sustain duty cycle, reducing output voltage undershoot to typically <2% in automotive BMS applications.
What thermal performance can be expected from LM5169PQDDARQ1 in a typical automotive PCB layout?
In a standard 4-layer PCB with 2 oz copper and 49 cm² thermal pad area, LM5169PQDDARQ1 achieves a junction-to-ambient thermal resistance (RθJA) of 22°C/W on evaluation modules. With proper EP grounding and thermal vias, it sustains 0.65-A output at +125°C ambient while maintaining junction temperature below 150°C - meeting AEC-Q100 Grade 1 requirements.
LM5169PQDDARQ1 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
LM5169PQDDARQ1 FAQ
1.How can I place an order for LM5169PQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5169PQDDARQ1 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 LM5169PQDDARQ1 reliable?
The price and inventory of LM5169PQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5169PQDDARQ1 is usually 5 days.
3.What payment methods are accepted for LM5169PQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5169PQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5169PQDDARQ1?
LM5169PQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5169PQDDARQ1 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 LM5169PQDDARQ1?
For technical support, including LM5169PQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5169PQDDARQ1 requirements.
6.How does Aetrix verify that LM5169PQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LM5169PQDDARQ1 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 LM5169PQDDARQ1 meets industry standards.
7.What is the process for return or replacement of LM5169PQDDARQ1?
All LM5169PQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM5169PQDDARQ1, 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 LM5169PQDDARQ1 part is unused and in its original packaging.
Return procedure for LM5169PQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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