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Texas Instruments LM5163QDDARQ1
- Part No.:
- LM5163QDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5163QDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:12,776
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Product details
Overview
LM5163QDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC/DC converter delivering up to 0.5A output current, operating from 6V to 100V input, featuring 10.5µA no-load quiescent current, 50ns minimum on-time, and integrated 0.725Ω high-side and 0.34Ω low-side NMOS switches. It targets 48V mild hybrid ECU bias supplies where wide VIN range and ultra-low IQ are critical.
For engineers reviewing the LM5163QDDARQ1 datasheet, LM5163QDDARQ1 pinout, LM5163QDDARQ1 application, or LM5163QDDARQ1 equivalent, key selection considerations include its COT control architecture, programmable on-time via RON pin, open-drain PGOOD indicator, SO PowerPAD™ thermal performance, and diode emulation mode for light-load efficiency in automotive 48V systems.
Technical Context
The LM5163QDDARQ1 implements a constant-on-time (COT) control scheme with input-voltage feedforward to maintain quasi-fixed switching frequency up to 1MHz; on-time is set by external resistor RON and inversely proportional to VIN. Its valley-current foldback protection activates at 0.6A after peak-current limit detection at 0.75A, enabling robust short-circuit handling without external components.
It integrates both high-side and low-side NMOS power switches, eliminating external Schottky diodes, and features internal VCC bias regulator, bootstrap diode, 1.2V reference, and no-loop-compensation design. The device supports monotonic start-up into prebiased loads and operates down to 6V input at near-100% duty cycle for automotive battery dips.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - enables direct step-down from 48V nominal bus to 3.3V/5V/12V rails without pre-regulator |
| Output Current | 0.5A continuous - sufficient for automotive sensor clusters, HVAC controllers, and PTC heater bias rails |
| Quiescent Current | 10.5µA at no load - minimizes battery drain during vehicle sleep modes in MHEV/EV systems |
| Min On-Time | 50ns - supports >10:1 step-down ratios (e.g., 48V → 3.3V) without external active clamping |
| Switching Frequency | Up to 1MHz - allows compact magnetics and reduces EMI filter size in space-constrained ECUs |
| Thermal Protection | 175°C shutdown with 10°C hysteresis - ensures safe operation under sustained overload or poor PCB heatsinking |
| Feedback Reference | 1.2V ±1.5% - enables precise output regulation across –40°C to +125°C ambient with minimal external divider error |
Pinout & Package
The LM5163QDDARQ1 is housed in an 8-pin SO PowerPAD™ (DDA) package with 1.27mm pin pitch and exposed thermal pad (EP), optimized for high-voltage spacing and low junction-to-board thermal resistance (16.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for internal circuits and EP solder connection - must tie to large copper plane for thermal management |
| VIN (Pin 2) | Power input | Direct connection to 6–100V source; powers high-side switch and internal VCC regulator - requires low-impedance layout |
| EN/UVLO (Pin 3) | Enable & UVLO control | Three-state logic: <1.1V = shutdown, 1.1–1.5V = standby, >1.5V = full operation - enables programmable input undervoltage lockout |
| RON (Pin 4) | On-time programming | Resistor-to-GND sets tON; determines switching frequency in CCM - enables VIN-adaptive timing without external clock |
| FB (Pin 5) | Feedback input | Compares output voltage (via resistor divider) to 1.2V internal reference - no compensation required due to COT stability |
| PGOOD (Pin 6) | Power-good indicator | Open-drain output signals valid regulation (±3% window); used for sequencing, fault reporting, and system monitoring |
| BST (Pin 7) | Bootstrap supply | Connects to SW via 2.2nF X7R capacitor - provides gate drive voltage for high-side NMOS; internal diode recharges it each cycle |
| SW (Pin 8) | Switching node | Internal connection between high-side source and low-side drain - routes to inductor; high dv/dt node requiring tight loop layout |
| EP | Exposed pad | No electrical function; soldered to GND plane for thermal conduction - mandatory for 0.5A operation at TJ ≤ 150°C |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual NMOS switches | 0.725Ω HS + 0.34Ω LS eliminates external Schottky diode and reduces BOM count by ≥3 components |
| Diode emulation mode (DEM) | Prevents reverse inductor current at light loads, increasing efficiency by 5–10% vs. forced-PWM below 50mA |
| Ultra-low IQ architecture | 10.5µA sleep current enables >1-year battery hold-up in always-on automotive modules without recharge |
| Peak-and-valley overcurrent protection | Dual-threshold (0.75A peak / 0.6A valley) prevents thermal runaway during short circuits while maintaining output regulation |
| Fixed 3ms internal soft-start | Ensures monotonic VOUT ramp into prebiased loads - eliminates inrush-induced system resets in multi-rail ECUs |
Applications
| Automotive 48V Mild Hybrid ECU Bias Supply | Automotive HVAC Compressor Control |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in 48V-based engine control unit during cold cranking when battery sags to 6V. IC Role / Device Role / Timing Role: Primary buck regulator converting 48V nominal bus to stable 3.3V/5V rail; maintains regulation at 99% duty cycle during 6V dips. Use Value: Enables uninterrupted ECU operation during transient battery conditions, meeting ISO 16750-2 Pulse 4 requirements without external surge suppressors. | Use Scenario: Supplies gate driver and logic for HVAC compressor inverter in electric vehicle cabin climate system. IC Role / Device Role / Timing Role: Secondary bias supply generating isolated 12V rail from 48V main bus; synchronized via PGOOD to enable inverter only after stable voltage. Use Value: Reduces solution size by 40% vs. discrete buck + LDO approach while achieving >85% efficiency at 300mA load across –40°C to +105°C. |
| Automotive PTC Heater Controller | Automotive ADAS Camera Module |
Use Scenario: Provides regulated 5V rail to MCU and temperature sensors in high-power PTC heater module for battery thermal management. IC Role / Device Role / Timing Role: High-reliability buck converter operating continuously at 125°C ambient; uses thermal shutdown with auto-recovery to survive intermittent overloads. Use Value: Eliminates need for external thermal monitoring circuitry - built-in 175°C shutdown and 10°C hysteresis ensure safe derating without firmware intervention. | Use Scenario: Powers image signal processor and MIPI interface in rear-view camera module mounted near exhaust manifold. IC Role / Device Role / Timing Role: Input-filtered buck regulator accepting 9–16V automotive battery; delivers clean 1.8V core and 3.3V I/O rails with <10mV ripple. Use Value: Achieves <15mVpp output noise at 1MHz switching - meets CISPR-25 Class 5 EMI limits without ferrite beads or shielding cans. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | Higher 1A output current; identical 6–100V input, 50ns min on-time, and AEC-Q100 Grade 1 qualification | Targeted at higher-power ECUs (e.g., ADAS domain controllers) requiring >0.5A sustained load | Select when output current demand exceeds 0.5A but same thermal and layout constraints apply |
| TPS54160AQRTQRQ1 | Lower 1.5A rating but wider 3.5–60V input; uses current-mode control instead of COT; 115µA IQ vs. 10.5µA | Suitable for 12V/24V legacy automotive systems where ultra-low IQ is less critical than cost | Choose for cost-sensitive 24V applications where 115µA IQ is acceptable and 100V capability unnecessary |
Compared with LM5164QDDARQ1, the LM5163QDDARQ1 offers lower BOM cost and smaller footprint for sub-0.5A loads; versus TPS54160AQRTQRQ1, it delivers 10× lower quiescent current and superior 48V–100V transient handling, making it optimal for next-gen MHEV power architectures.
Availability
LM5163QDDARQ1 is available at Aetrix Electronics and suitable for automotive 48V mild hybrid ECU bias supplies, HVAC compressor control, and PTC heater controller designs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM5163QDDARQ1 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 qualification expertise.
The LM5163QDDARQ1 belongs to TI's automotive-grade DC/DC converter portfolio, designed specifically for high-input-voltage, ultra-low-IQ power conversion in 48V mild hybrid and EV systems where reliability, thermal robustness, and EMI performance are critical.
FAQ
What is the maximum output current supported by the LM5163QDDARQ1?
The LM5163QDDARQ1 delivers up to 0.5A of continuous output current under recommended operating conditions (TJ ≤ 150°C, proper PCB thermal design). Peak current limit is specified at 0.75A typical, with valley-foldback activation at 0.6A to prevent thermal runaway. Derating is required above 125°C ambient; full 0.5A is guaranteed from –40°C to +125°C ambient with adequate copper area on the EP pad.
Does the LM5163QDDARQ1 require external compensation components?
No, the LM5163QDDARQ1 does not require external loop compensation components. Its constant-on-time (COT) control architecture with input-voltage feedforward provides inherent stability across the full 6V–100V input range and load conditions. Only two external resistors (RFB1/RFB2) and one capacitor (CBST) are mandatory; no RC networks or type-2/type-3 compensators are needed.
How does the LM5163QDDARQ1 achieve ultra-low quiescent current?
The LM5163QDDARQ1 achieves 10.5µA no-load IQ through a dedicated low-power sleep mode that disables switching, gate drivers, and non-essential bias circuits while maintaining feedback monitoring. When EN/UVLO voltage drops below 1.5V, it enters shutdown with only 3µA draw. This architecture is validated across –40°C to +125°C and enables >1-year battery hold-up in always-on automotive modules powered by LM5163QDDARQ1.
What is the purpose of the RON pin on the LM5163QDDARQ1?
RON pin on the LM5163QDDARQ1 sets the programmable on-time for the high-side NMOS switch via an external resistor to GND. This resistor determines switching frequency in continuous conduction mode (CCM) and enables VIN-adaptive timing - on-time decreases as VIN increases to maintain quasi-constant frequency. RON also enables precise control of minimum duty cycle for large step-down ratios without external timing ICs.
Can the LM5163QDDARQ1 operate with input voltage as low as 6V?
Yes, the LM5163QDDARQ1 operates down to 6V input while maintaining regulation, supporting near-100% duty cycle operation. At 6V VIN, it sustains output regulation even when VOUT is close to VIN (e.g., 5.5V out), making it ideal for automotive cold-crank scenarios per ISO 16750-2. The internal VCC regulator remains functional across this range, and bootstrap capacitor charging is ensured by the 50ns minimum off-time.
LM5163QDDARQ1 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):
- 100V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 100V
- Current - Output:
- 500mA
- Frequency - Switching:
- 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
LM5163QDDARQ1 FAQ
1.How can I place an order for LM5163QDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5163QDDARQ1 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 LM5163QDDARQ1 reliable?
The price and inventory of LM5163QDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5163QDDARQ1 is usually 5 days.
3.What payment methods are accepted for LM5163QDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5163QDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5163QDDARQ1?
LM5163QDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5163QDDARQ1 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 LM5163QDDARQ1?
For technical support, including LM5163QDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5163QDDARQ1 requirements.
6.How does Aetrix verify that LM5163QDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LM5163QDDARQ1 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 LM5163QDDARQ1 meets industry standards.
7.What is the process for return or replacement of LM5163QDDARQ1?
All LM5163QDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM5163QDDARQ1, 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 LM5163QDDARQ1 part is unused and in its original packaging.
Return procedure for LM5163QDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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