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Texas Instruments LM5169PDDAR
- Part No.:
- LM5169PDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5169PDDAR.pdf
- Description:
- IC REG BUCK ADJ 650MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:909
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Product details
Overview
LM5169PDDAR from Texas Instruments is a synchronous step-down DC/DC converter IC with integrated 1.9Ω high-side and 0.71Ω low-side NMOS FETs, delivering up to 0.65A output current. It operates from 6V to 115V input (120V absolute max), features constant-on-time (COT) control, FPWM/auto mode selection, and supports Fly-Buck™ isolated dual-output topologies in industrial battery packs and 48V telecom systems.
For engineers reviewing the LM5169PDDAR datasheet, LM5169PDDAR pinout, LM5169PDDAR application, or LM5169PDDAR equivalent, this page delivers verified technical context, validated pin functions, confirmed Fly-Buck capability, real-world thermal performance (RθJA = 38.9°C/W in SOIC-8), and precise alternative part comparisons - all grounded in TI's SNVSBS7B production datasheet.
Technical Context
The LM5169PDDAR implements a constant-on-time (COT) control architecture with VIN feed-forward, enabling quasi-fixed switching frequency (100–1000 kHz) across wide input ranges. Its 50ns minimum on/off times support ultra-high step-down ratios (e.g., 48V-to-3.3V) and near-100% duty cycle operation down to 6V input.
It integrates both power FETs, internal 1.2V reference, VCC bias regulator, boot diode, and open-drain PGOOD indicator. Protection includes peak/valley current limiting (0.84A hiccup), input UVLO (1.45V rising threshold), thermal shutdown (175°C), and fixed 3ms soft-start - all without external loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 115V operating; 120V absolute maximum - enables direct regulation from 48V/60V/96V battery stacks without pre-regulators. |
| Output Current | 0.65A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in high-voltage industrial nodes. |
| Switching Frequency | 100–1000 kHz, adjustable via RT resistor - balances EMI control, inductor size, and efficiency across load conditions. |
| Quiescent Current | <10µA in auto-mode ultra-low-IQ state - extends standby time in battery-powered e-bike or LEV applications. |
| Current Limit | 0.84A hiccup-mode peak limit - provides robust short-circuit protection while maintaining thermal safety at 150°C junction. |
| Thermal Resistance | RθJA = 38.9°C/W (SOIC-8 PowerPAD™) - requires minimal PCB copper area for reliable 0.65A operation at 125°C ambient. |
| Feedback Reference | 1.2V ±1.5% (1.181–1.218V) - enables accurate output regulation with standard resistor dividers for 3.3V, 5V, or custom rails. |
Pinout & Package
LM5169PDDAR uses the SOIC PowerPAD™-8 (DDA) package: 4.9mm × 6mm body, 1.27mm pin pitch, exposed thermal pad (EP) soldered to GND for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuits and thermal path via EP; must connect EP directly to large GND copper pour. |
| 2 | VIN | Main input supply (6–115V); powers high-side FET and internal VCC regulator - requires low-inductance path to bulk capacitor. |
| 3 | EN/UVLO | Enable/undervoltage lockout input; 1.45V rising threshold enables startup, 1.1V rising enters standby (LDO only). |
| 4 | RT | On-time programming pin; sets tON via resistor to GND - determines switching frequency and minimum controllable duty cycle. |
| 5 | FB | Feedback input for output voltage regulation; compares against 1.2V reference - requires ≥20mV ripple for COT stability. |
| 6 | PGOOD | Open-drain power-good indicator; asserts high when FB > 1.105V - used for rail sequencing and fault reporting. |
| 7 | BST | Bootstrap supply for high-side gate driver; requires 2.2nF X7R ceramic capacitor between BST and SW. |
| 8 | SW | Switching node; connects internally to source of HS-FET and drain of LS-FET - critical for layout; minimize loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Fly-Buck™ capability | FPWM mode forces CCM across full load range - enables isolated secondary output using coupled inductor without optocoupler. |
| Ultra-low IQ auto mode | <10µA quiescent current at light loads - preserves battery energy in e-scooter or industrial sensor sleep states. |
| Integrated power stage | 1.9Ω HS + 0.71Ω LS NMOS FETs - eliminates external MOSFETs and drivers, reducing BOM count and layout complexity. |
| No loop compensation | COT architecture with built-in stability margin - removes external RC networks, accelerates design, improves transient response. |
| Hiccup overcurrent protection | 0.84A peak limit with 64ms hiccup timer - prevents thermal runaway during sustained overload or short-circuit events. |
Applications
| Industrial Battery Packs (≥10S) | 48V Telecom / PoE Systems |
|---|---|
|
Use Scenario: Regulating 54V nominal battery stack (15S Li-ion) to 5V/3.3V for MCU and CAN transceivers in warehouse AGVs. IC Role / Device Role / Timing Role: Primary buck regulator with Fly-Buck capability to generate isolated 12V for analog front-end isolation. Use Value: Eliminates need for separate isolated DC/DC; 0.65A output sustains peak MCU + radio loads; 120V abs max withstands load-dump transients. |
Use Scenario: Converting 48V PoE++ (IEEE 802.3bt) input to 12V for fan control and 3.3V for Ethernet PHY in network switches. IC Role / Device Role / Timing Role: High-input-voltage synchronous buck controller with fast line/load transient response for dynamic PoE power allocation. Use Value: 50ns min on-time enables stable 48V→3.3V conversion; COT control ensures <1% output deviation during 50% load steps. |
| E-Bike / LEV Power Management | Brick Power Modules |
|
Use Scenario: Deriving 15V gate drive and 5V logic rails from 36V/48V e-bike battery pack in motor controller PCB. IC Role / Device Role / Timing Role: Dual-rail power supply IC with integrated FETs and thermal shutdown - operates reliably at 105°C under chassis heat. Use Value: 150°C junction rating and 38.9°C/W RθJA allow full 0.65A output without derating in compact sealed enclosures. |
Use Scenario: Secondary-side regulation in 200W AC/DC brick supplying 12V/5V/3.3V outputs for industrial PLC backplanes. IC Role / Device Role / Timing Role: Input-stage buck converter accepting wide-range 24–75V DC input from primary LLC stage. Use Value: 6V–115V input range absorbs line variations and hold-up dips; FPWM mode maintains regulation during brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5169FDDAR | Same SOIC-8 package and 0.65A rating, but factory-configured for FPWM-only mode (no auto/PFM). | Required where Fly-Buck operation is mandatory and light-load efficiency is secondary. | Select LM5169FDDAR if CCM-only behavior is needed; LM5169PDDAR offers flexibility with auto-mode for battery longevity. |
| LM5164QPWPRQ1 | Automotive-grade (AEC-Q100), 1A output, 100V max, WSON-16 package - no Fly-Buck support, higher IQ (420µA active). | Suitable for automotive infotainment or ADAS power rails where qualification and higher current outweigh isolation needs. | Choose LM5164QPWPRQ1 only for automotive-qualified designs; LM5169PDDAR provides Fly-Buck and lower IQ for industrial/LEV use. |
Compared with LM5169FDDAR, LM5169PDDAR adds auto-mode for superior light-load efficiency and battery runtime; compared with LM5164QPWPRQ1, it trades AEC-Q100 qualification and higher current for Fly-Buck capability, lower IQ, and cost-effective SOIC-8 packaging.
Availability
LM5169PDDAR is available at Aetrix Electronics and suitable for industrial battery packs, 48V telecom systems, and e-bike power management requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for LM5169PDDAR 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 LM516x product line targets rugged industrial and high-cell-count battery applications, delivering wide-input synchronous buck regulation with integrated FETs, Fly-Buck capability, and functional safety support - optimized for minimal external components and robust field operation.
FAQ
What is the maximum input voltage rating for LM5169PDDAR?
The LM5169PDDAR has an absolute maximum input voltage rating of 120V, with recommended operating range up to 115V. This allows direct connection to 48V, 60V, or 96V battery systems while surviving transient surges common in industrial and automotive environments. Operation beyond 115V is not advised for long-term reliability per TI's SNVSBS7B datasheet.
Does LM5169PDDAR support isolated Fly-Buck™ converter topologies?
Yes, LM5169PDDAR supports Fly-Buck™ operation in FPWM mode, which forces continuous conduction mode across all load conditions. This enables generation of an isolated secondary output using a coupled inductor - confirmed in TI's device description, Figure 8-2, and Section 8.2 of SNVSBS7B. Auto-mode disables Fly-Buck capability.
What is the thermal performance of LM5169PDDAR in its SOIC-8 PowerPAD™ package?
In the DDA (SOIC PowerPAD™-8) package, LM5169PDDAR has a junction-to-ambient thermal resistance (RθJA) of 38.9°C/W on standard EVM layout. With proper EP grounding to a 49 cm² copper area, it sustains 0.65A output continuously at 125°C ambient - verified in Section 6.4 and Figure 6-6 of the official datasheet.
How does the current-limit protection work in LM5169PDDAR?
LM5169PDDAR implements hiccup-mode overcurrent protection with a 0.84A typical peak current limit and 64ms restart delay. When triggered, the high-side FET shuts off and the device enters recovery timeout - preventing thermal damage during sustained shorts. Valley current limiting (0.672A) further enhances robustness during low-duty-cycle operation.
Can LM5169PDDAR operate efficiently at very light loads?
Yes - in auto mode, LM5169PDDAR transitions to ultra-low IQ state (<10µA) when load current drops below ~1mA, significantly extending battery life in standby. This is achieved via diode emulation and pulse-skipping, with monotonic start-up into pre-biased loads confirmed in Section 7.1 and Table 6-5 of SNVSBS7B.
LM5169PDDAR 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM5169PDDAR FAQ
1.How can I place an order for LM5169PDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5169PDDAR 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 LM5169PDDAR reliable?
The price and inventory of LM5169PDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5169PDDAR is usually 5 days.
3.What payment methods are accepted for LM5169PDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5169PDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5169PDDAR?
LM5169PDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5169PDDAR 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 LM5169PDDAR?
For technical support, including LM5169PDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5169PDDAR requirements.
6.How does Aetrix verify that LM5169PDDAR is sourced from the original manufacturer or authorized distributors?
All LM5169PDDAR 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 LM5169PDDAR meets industry standards.
7.What is the process for return or replacement of LM5169PDDAR?
All LM5169PDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LM5169PDDAR, 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 LM5169PDDAR part is unused and in its original packaging.
Return procedure for LM5169PDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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