My Inquiry
My Account
Texas Instruments LM5168PQDDARQ1
- Part No.:
- LM5168PQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5168PQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 300MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:696
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM5168PQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 0.3-A output current, featuring 6 V to 120 V input range, 50 ns minimum on-time, FPWM mode for Fly-Buck™ capability, and integrated 1.9-Ω high-side and 0.71-Ω low-side NFETs. It targets HEV/EV battery management systems and high-cell-count e-bike/e-scooter power supplies.
For engineers reviewing the LM5168PQDDARQ1 datasheet, LM5168PQDDARQ1 pinout, LM5168PQDDARQ1 application, or LM5168PQDDARQ1 equivalent, key selection considerations include its 3-µA shutdown IQ, auto-mode diode emulation for light-load efficiency, 1.2-V internal reference, thermal shutdown at 175°C, and SO PowerPAD™ package with exposed pad for thermal management.
Technical Context
The LM5168PQDDARQ1 implements a constant-on-time (COT) control architecture with VIN feed-forward to maintain quasi-fixed switching frequency across 6–120 V input. Its 50 ns minimum on/off times enable direct 48-V-to-low-voltage conversion and near-100% duty cycle operation during input dips down to 6 V.
It integrates both high-side and low-side NFETs, supports FPWM mode for forced CCM operation required in isolated Fly-Buck™ topologies, and features smart peak/valley current limiting with hiccup protection-triggering after 16 consecutive overcurrent events and recovering via soft-start reset after four fault-free cycles.
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 ≥10-S battery packs without pre-regulation |
| Output Current | 0.3 A - sufficient for auxiliary rails in BMS, infotainment subsystems, and sensor power domains |
| Switching Frequency | Up to 1 MHz - allows compact magnetics and fast transient response in space-constrained automotive modules |
| Quiescent Current | < 10 µA in auto mode - preserves battery life during vehicle sleep states |
| Shutdown Current | 3–6 µA - minimizes standby drain in always-on vehicle networks |
| Thermal Shutdown | 175°C with 10°C hysteresis - ensures robust operation under sustained load in under-hood environments |
| Feedback Reference | 1.2 V ±1.5% - provides stable output regulation with minimal external resistor tolerance impact |
Pinout & Package
LM5168PQDDARQ1 is housed in an 8-pin SOIC PowerPAD™ package (4.89 mm × 3.90 mm, 1.27-mm pitch), with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJB = 14.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for internal circuits and power stage; connects directly to exposed pad |
| VIN (Pin 2) | Power input | Supplies high-side FET and internal VCC regulator; rated for 120 V DC with surge resilience |
| EN/UVLO (Pin 3) | Enable & undervoltage lockout | Enables startup at >1.5 V; enters standby at 1.1–1.5 V; disables at <1.1 V - programmable UVLO threshold |
| RT (Pin 4) | On-time programming | Resistor-to-ground sets tON; determines switching frequency in CCM (e.g., 75 kΩ → ~2550 ns @ 12 V) |
| FB (Pin 5) | Feedback input | Compares output voltage against 1.2-V internal reference; requires ≥20 mV ripple for COT stability |
| PGOOD (Pin 6) | Open-drain status indicator | Signals valid regulation (±3% window); requires external 10–100 kΩ pull-up for rail sequencing |
| BST (Pin 7) | Bootstrap supply | Drives high-side gate; requires 2.2-nF X7R ceramic capacitor between BST and SW |
| SW (Pin 8) | Switching node | Internal connection point of high-side source and low-side drain; interfaces with external inductor and catch diode |
Key Features
| Feature | Design Value |
|---|---|
| FPWM mode support | Forces continuous conduction mode across full load range - essential for stable isolated Fly-Buck™ secondary output generation |
| Integrated power FETs | 1.9-Ω HS + 0.71-Ω LS NFETs eliminate external switches - reduces BOM count and layout complexity |
| No loop compensation needed | COT architecture eliminates external RC network - accelerates design cycle and improves transient immunity |
| Diode emulation (auto mode) | Disables low-side FET at zero inductor current - prevents reverse conduction loss and boosts light-load efficiency |
| Fixed 3-ms soft-start | Monotonic VOUT ramp with pre-biased load compatibility - avoids inrush stress on downstream capacitors and ICs |
Applications
| Communications – Brick Power Module | Industrial Battery Pack (≥10 S) |
|---|---|
Use Scenario: Regulating 48-V telecom brick input to 3.3-V/5-V logic rails in distributed power architectures. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing tightly regulated auxiliary power with fast line/load transients. Use Value: 50 ns minimum on-time enables single-stage 48-V-to-3.3-V conversion, eliminating cascaded stages and reducing solution size by >30%. | Use Scenario: Powering MCU, CAN transceiver, and cell monitoring ICs in 36–48-V industrial battery packs. IC Role / Device Role / Timing Role: System-supply buck converter operating across wide input (e.g., 12–50 V) during charge/discharge cycles. Use Value: 6–120 V input range accommodates full pack voltage swing without input filtering or clamping components. |
| Battery Pack – E-bike/E-scooter/LEV | HEV/EV – Battery Management System |
Use Scenario: Generating 5-V USB power and 3.3-V sensor rails from 24–36-V e-bike battery packs with aggressive space constraints. IC Role / Device Role / Timing Role: Compact, thermally efficient buck regulator mounted directly on BMS PCB near battery connector. Use Value: SO PowerPAD™ package with RθJB = 14.1°C/W sustains 0.3-A load at ambient ≤85°C without heatsink. | Use Scenario: Supplying isolated analog front-end and digital isolator bias rails in high-voltage BMS modules. IC Role / Device Role / Timing Role: Fly-Buck™ controller generating both primary 5-V and isolated 5-Viso outputs from 48-V main bus. Use Value: FPWM mode ensures CCM operation on primary side, enabling predictable transformer coupling and stable secondary regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5168FQDDARQ1 | Same 0.3-A rating but hiccup overcurrent protection instead of no-hiccup; FPWM-only mode | Suitable for Fly-Buck™ where secondary overload recovery must be enforced via hiccup restart | Select when isolated output reliability under sustained short-circuit is prioritized over seamless light-load PFM transitions |
| LM5164PQDDARQ1 | Pin-compatible 1-A buck; higher RDSON (2.2 Ω HS / 1.1 Ω LS); same 6–120 V range and COT architecture | Used where higher output current is required without changing PCB layout | Choose when system load exceeds 0.3 A but board space and pinout must remain unchanged |
Compared with LM5168FQDDARQ1, LM5168PQDDARQ1 offers smoother light-load efficiency via auto-mode PFM/DEM but lacks hiccup recovery; versus LM5164PQDDARQ1, it trades current capacity for lower conduction loss and reduced thermal footprint in low-power auxiliary rails.
Availability
LM5168PQDDARQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, e-mobility power modules, and industrial high-voltage DC-DC converters requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM5168PQDDARQ1 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 deep expertise in automotive-grade reliability and functional safety.
The LM516x-Q1 product line delivers scalable, high-voltage synchronous buck regulators optimized for HEV/EV power architectures, battery-powered industrial equipment, and ruggedized 48-V system designs.
FAQ
What is the maximum input voltage rating for LM5168PQDDARQ1?
The LM5168PQDDARQ1 has an absolute maximum input voltage rating of 120 V on the VIN pin, with recommended operating conditions spanning 6 V to 115 V. This wide range supports direct connection to 48-V automotive buses, ≥10-S lithium battery packs, and industrial 24–48-V systems without external pre-regulation or clamping circuitry. The device maintains regulation even during input dips down to 6 V at near-100% duty cycle.
Does LM5168PQDDARQ1 support Fly-Buck™ topology, and what configuration is required?
Yes, LM5168PQDDARQ1 supports Fly-Buck™ operation in FPWM mode, which forces continuous conduction mode across all load conditions. This ensures consistent transformer coupling and stable isolated secondary output regulation. To implement Fly-Buck™, configure the device in FPWM mode (via factory option), use a coupled inductor, and ensure minimum on-time exceeds 100 ns - verified by selecting RT ≥ 25 kΩ for typical 12-V input applications.
What is the quiescent current of LM5168PQDDARQ1 in auto mode versus shutdown?
In auto mode, LM5168PQDDARQ1 draws less than 10 µA at light loads due to diode emulation and ultra-low IQ sleep transitions. In shutdown state (EN/UVLO < 1.1 V), it consumes only 3–6 µA from VIN. These ultra-low currents make LM5168PQDDARQ1 ideal for always-on automotive subsystems such as CAN wake-up receivers and battery monitor ICs where standby power budget is critical.
How does the current-limit protection work in LM5168PQDDARQ1?
LM5168PQDDARQ1 employs dual-cycle current limiting: a peak limit of 0.42 A (typical) triggers immediate high-side turn-off, followed by valley current foldback at 0.34 A to sustain safe average output current. Unlike hiccup variants, LM5168PQDDARQ1 uses no-hiccup protection - maintaining regulation during overload with frequency foldback rather than latching off. This behavior prevents system brownouts during temporary overloads in BMS sensor rails.
What package type and thermal characteristics apply to LM5168PQDDARQ1?
LM5168PQDDARQ1 uses the 8-pin SOIC PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad. Its junction-to-board thermal resistance is 14.1°C/W, and junction-to-ambient (on standard EVM) is 22°C/W. The exposed pad must be soldered to a large GND copper area to achieve rated 0.3-A output current at ambient temperatures up to 85°C without forced airflow.
LM5168PQDDARQ1 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM5168PQDDARQ1 FAQ
1.How can I place an order for LM5168PQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5168PQDDARQ1 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 LM5168PQDDARQ1 reliable?
The price and inventory of LM5168PQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5168PQDDARQ1 is usually 5 days.
3.What payment methods are accepted for LM5168PQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5168PQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5168PQDDARQ1?
LM5168PQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5168PQDDARQ1 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 LM5168PQDDARQ1?
For technical support, including LM5168PQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5168PQDDARQ1 requirements.
6.How does Aetrix verify that LM5168PQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LM5168PQDDARQ1 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 LM5168PQDDARQ1 meets industry standards.
7.What is the process for return or replacement of LM5168PQDDARQ1?
All LM5168PQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM5168PQDDARQ1, 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 LM5168PQDDARQ1 part is unused and in its original packaging.
Return procedure for LM5168PQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM5168PQDDARQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
