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Texas Instruments LM5168PDDAR
- Part No.:
- LM5168PDDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5168PDDAR.pdf
- Description:
- IC REG BUCK ADJ 300MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
LM5168PDDAR from Texas Instruments is a 0.3A synchronous step-down DC/DC converter with Fly-Buck™ capability, designed for wide-input industrial and battery-pack applications. It operates from 6V to 115V (120V abs max), integrates 1.9Ω high-side and 0.71Ω low-side NFETs, features constant-on-time (COT) control, and delivers regulated output with no external loop compensation required - used in e-bike battery packs and 48V telecom power modules.
For engineers reviewing the LM5168PDDAR datasheet, LM5168PDDAR pinout, LM5168PDDAR application, or LM5168PDDAR equivalent, key selection considerations include its 0.3A output current rating, AUTO-mode ultra-low IQ (<10µA), FPWM-enabled isolated Fly-Buck operation, 50ns minimum on/off time, and SOIC PowerPAD-8 package compatibility with rugged 150°C junction temperature support.
Technical Context
The LM5168PDDAR implements a constant-on-time (COT) control architecture with input-voltage feed-forward, enabling quasi-fixed switching frequency (100–1000 kHz) across 6V–115V input range. Its internal soft-start timer (3ms fixed), precision enable/UVLO (1.5V rising threshold), and open-drain PGOOD indicator support robust power-rail sequencing in high-reliability systems.
It integrates both high-side (1.9Ω RDSON) and low-side (0.71Ω RDSON) NFETs, eliminating external MOSFETs and gate drivers. The device supports two operational modes: AUTO mode (diode emulation + ultra-low IQ <10µA at light load) and FPWM mode (forced CCM for Fly-Buck isolation), with pin-selectable configuration via factory option - LM5168PDDAR is pre-configured for AUTO mode with no-hiccup overcurrent protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 0.3 A continuous - defines maximum sustained load capability without thermal derating under typical PCB layout conditions. |
| Input Voltage Range | 6 V to 115 V (120 V absolute max) - enables direct regulation from 10S+ Li-ion packs or 48V/96V industrial rails without pre-regulation. |
| Switching Frequency | 100 kHz to 1 MHz - adjustable via RT resistor; higher frequencies allow smaller magnetics but increase switching loss. |
| Quiescent Current | <10 µA in AUTO mode - minimizes standby power draw in battery-powered systems during sleep or idle states. |
| Min On/Off Time | 50 ns - supports large step-down ratios (e.g., 48V → 3.3V) and near-100% duty cycle operation during brownout conditions. |
| Current Limit | 0.42 A peak, no-hiccup - provides cycle-by-cycle overcurrent protection without latch-off, enabling self-recovery after transient overload. |
| Reference Voltage | 1.20 V ±1.5% - sets output voltage accuracy via external FB divider; stable over –40°C to +150°C junction temperature. |
Pinout & Package
LM5168PDDAR is housed in an 8-pin SOIC PowerPAD™ package (DDA), featuring exposed thermal pad (EP) soldered to GND for enhanced thermal dissipation. Pin pitch is 1.27 mm, optimized for high-voltage creepage and clearance in industrial designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuits and thermal path via EP; must be connected to large copper area. |
| 2 | VIN | Main input supply (6–115 V); powers high-side FET and internal VCC regulator; requires low-impedance connection. |
| 3 | EN/UVLO | Enable/undervoltage lockout input; rising threshold at 1.5 V enables startup; falling threshold at 1.4 V disables switching. |
| 4 | RT | On-time programming pin; resistor to GND sets tON and thus switching frequency in CCM operation. |
| 5 | FB | Feedback input for output voltage regulation; compares against 1.2 V internal reference to adjust duty cycle. |
| 6 | PGOOD | Open-drain power-good indicator; asserts high when output is within ±5% of target; requires external pullup. |
| 7 | BST | Bootstrap supply for high-side gate driver; requires 2.2 nF X7R ceramic capacitor between BST and SW. |
| 8 | SW | Switching node connecting internal high-side drain and low-side source; connects to inductor and BST capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 1.9Ω high-side + 0.71Ω low-side NFETs reduce BOM count and layout complexity while maintaining 0.3A output capability. |
| Constant-On-Time Control | No external compensation required; achieves fast transient response and stable operation across wide VIN and load ranges. |
| Fly-Buck™ Capability (FPWM) | Forced CCM operation enables isolated secondary output generation using coupled inductor - supported in FPWM variant, not LM5168PDDAR. |
| Ultra-Low IQ Auto Mode | <10 µA quiescent current extends battery life in always-on or intermittent-use applications like e-scooter controllers. |
| Robust Protection Suite | Peak/valley current limiting, thermal shutdown (175°C), input UVLO, and hiccup-free overcurrent ensure field reliability. |
Applications
| Industrial Battery Packs | 48V Telecom Power Modules |
|---|---|
|
Use Scenario: Regulation from 10S–16S Li-ion battery stacks (36–67V nominal) powering motor controllers and telemetry in e-bikes and LEVs. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 5V/3.3V rails; handles input dips down to 6V with near-100% duty cycle. Use Value: Eliminates need for pre-regulator stages, reduces system size/cost, and maintains operation during deep discharge events. |
Use Scenario: Point-of-load conversion in brick-style telecom power supplies accepting 36–75V DC inputs per GR-1089-CORE. IC Role / Device Role / Timing Role: Secondary-stage DC/DC converter delivering isolated auxiliary rails; leverages FPWM mode in compatible variants. Use Value: Enables compact, high-efficiency design meeting EMI and thermal constraints in space-constrained telecom chassis. |
| E-Bike Display & Sensor Hub | High-Voltage Industrial PLC I/O |
|
Use Scenario: Powering LCD displays, BLE modules, and IMU sensors from main 42V battery pack in smart e-bikes. IC Role / Device Role / Timing Role: Low-noise, low-IQ buck converter operating in AUTO mode during display sleep cycles. Use Value: Extends display runtime by >3× versus standard PWM converters due to sub-10µA quiescent current. |
Use Scenario: Generating 5V/12V rails for digital I/O and analog front-end circuitry in programmable logic controllers rated for 75V DC bus. IC Role / Device Role / Timing Role: Wide-input primary regulator supporting brownout resilience and surge immunity up to 120V transients. Use Value: Reduces need for external TVS/clamping networks, lowering bill-of-materials and improving long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5168FDDAR | Same package and pinout, but factory-configured for FPWM mode and hiccup overcurrent protection. | Required for Fly-Buck isolated outputs; unsuitable for ultra-low-IQ battery standby use cases. | Select LM5168FDDAR only when forced CCM and isolated secondary output are mandatory. |
| LM5164PDDAR | Higher 1.5A output, same 120V abs max rating, but uses different COT architecture and lacks integrated low-side FET. | Supports heavier loads but requires external synchronous rectifier and loop compensation components. | Choose LM5164PDDAR when >0.3A output or extended thermal margin is needed, accepting added design complexity. |
Compared with LM5168FDDAR, LM5168PDDAR offers superior light-load efficiency for battery longevity but cannot drive Fly-Buck topologies; versus LM5164PDDAR, it trades output current headroom for integration simplicity and lower quiescent power - making LM5168PDDAR optimal for compact, low-power industrial and mobility applications.
Availability
LM5168PDDAR is available at Aetrix Electronics and suitable for industrial battery packs, e-bike power systems, and 48V telecom power modules requiring stable component supply, long-lifecycle assurance, and automotive-grade reliability validation.
Supply support for LM5168PDDAR 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 was developed specifically for wide-input industrial and high-cell-count battery applications, emphasizing ruggedness, integration, and ease of use in harsh environments - LM5168PDDAR exemplifies this focus with its 120V absolute rating and 150°C junction capability.
FAQ
What is the maximum input voltage rating for LM5168PDDAR?
The LM5168PDDAR has an absolute maximum input voltage rating of 120 V, with recommended operating range up to 115 V. This allows direct connection to 10S–16S Li-ion battery packs and industrial 48V/72V/96V rails without external surge suppression. Operation beyond 115 V risks exceeding safe operating area limits and is not advised for sustained use.
Does LM5168PDDAR support Fly-Buck™ converter topology?
LM5168PDDAR is factory-configured for AUTO mode (PFM/diode emulation) and does not support Fly-Buck™ operation. Only FPWM variants like LM5168FDDAR provide forced continuous conduction mode required for isolated Fly-Buck designs. Using LM5168PDDAR in Fly-Buck configurations will result in unstable regulation and potential failure.
What is the quiescent current of LM5168PDDAR in shutdown mode?
In shutdown mode (EN/UVLO < 1.1 V), LM5168PDDAR draws only 3–6 µA typical from VIN at 25°C. This ultra-low shutdown current minimizes battery drain in always-connected systems such as e-scooter controllers or remote sensor nodes where long-term storage or infrequent wake-up is required.
How is output voltage set on LM5168PDDAR?
LM5168PDDAR uses a resistive feedback divider connected to the FB pin to set output voltage, referenced to its internal 1.20 V ±1.5% bandgap. For example, a 1.20 V reference with R1 = 100 kΩ and R2 = 12.1 kΩ yields VOUT = 1.2 × (1 + 100/12.1) ≈ 11.1 V. Layout best practices require short, low-impedance traces to FB and placement away from noisy SW/BST nodes.
What thermal performance can be expected from LM5168PDDAR in SOIC PowerPAD™ package?
In the DDA (SOIC PowerPAD™-8) package, LM5168PDDAR achieves a junction-to-ambient thermal resistance (RθJA) of 38.9°C/W on standard 2-layer PCBs, dropping to 22°C/W with 49 cm² copper area per evaluation module. With 0.3A load and 24V input, typical temperature rise is <35°C above ambient - enabling reliable operation up to +115°C ambient when properly heatsinked.
LM5168PDDAR 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:
- 300mA
- 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
LM5168PDDAR FAQ
1.How can I place an order for LM5168PDDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5168PDDAR 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 LM5168PDDAR reliable?
The price and inventory of LM5168PDDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5168PDDAR is usually 5 days.
3.What payment methods are accepted for LM5168PDDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5168PDDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5168PDDAR?
LM5168PDDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5168PDDAR 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 LM5168PDDAR?
For technical support, including LM5168PDDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5168PDDAR requirements.
6.How does Aetrix verify that LM5168PDDAR is sourced from the original manufacturer or authorized distributors?
All LM5168PDDAR 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 LM5168PDDAR meets industry standards.
7.What is the process for return or replacement of LM5168PDDAR?
All LM5168PDDAR units undergo pre-shipment inspection (PSI). If there is an issue with LM5168PDDAR, 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 LM5168PDDAR part is unused and in its original packaging.
Return procedure for LM5168PDDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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