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Texas Instruments LM5165QDGSRQ1
- Part No.:
- LM5165QDGSRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM5165QDGSRQ1.pdf
- Description:
- IC REG BUCK ADJ 150MA 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,796
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Product details
Overview
LM5165QDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 150 mA output current with fixed 3.3 V or 5 V, or adjustable output; operates from 3 V to 65 V input; features 10.5 µA no-load quiescent current and integrated 2-Ω PMOS high-side / 1-Ω NMOS low-side switches; used in automotive infotainment power rails and battery-supplied ADAS sensors.
For engineers reviewing the LM5165QDGSRQ1 datasheet, LM5165QDGSRQ1 pinout, LM5165QDGSRQ1 application, or LM5165QDGSRQ1 equivalent, key selection criteria include ultra-low IQ for always-on systems, 100% duty-cycle capability for low-dropout operation, selectable PFM/COT control modes, programmable current limit, and AEC-Q100 qualification for under-hood deployment.
Technical Context
The LM5165QDGSRQ1 implements a constant-on-time (COT) or pulse-frequency-modulation (PFM) control architecture with no loop compensation required. Its high-side P-channel MOSFET enables 100% duty cycle operation without bootstrap circuitry, while the integrated low-side N-channel MOSFET eliminates external rectification.
It supports monotonic start-up into prebiased outputs, active slew-rate control for EMI reduction, and precision enable/UVLO with programmable hysteresis via the HYS pin. The internal 1.223-V ±1% reference and 900-µs internal soft-start (or externally programmable) ensure stable regulation across wide VIN and temperature ranges (–40°C to 150°C junction).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 65 V - supports direct connection to automotive battery (cold-crank down to 3 V) and industrial HV rails without pre-regulation. |
| No-Load Quiescent Current | 10.5 µA - enables >1-year battery life in always-on vehicle modules with 10-mAh coin cell or low-power wake-up circuits. |
| Output Current Capability | 150 mA at 5 V (COT mode) - sufficient for powering microcontrollers, CAN transceivers, and sensor signal chains in compact ECUs. |
| Integrated Power Switches | 2 Ω high-side PMOS + 1 Ω low-side NMOS - eliminates external FETs and gate drivers; reduces BOM count and layout area by ~30% vs discrete solutions. |
| Control Modes | Selectable PFM or COT - PFM maximizes light-load efficiency (<1 mA); COT delivers near-constant frequency and fast transient response for dynamic loads. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B - achieves radiated emissions <40 dBµV/m at 30–230 MHz with standard 4-layer PCB layout and no shielding. |
| Thermal Protection | 170°C shutdown with 10°C hysteresis - prevents thermal runaway during overload or poor heatsinking; automatic recovery avoids system latch-up. |
Pinout & Package
LM5165QDGSRQ1 is packaged in a 10-pin VSON (DRC) package with 3.00 mm × 3.00 mm body size and 0.5-mm pin pitch, featuring an exposed thermal pad for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switching node | Internal connection point of high-side PMOS drain and low-side NMOS drain; must be routed with minimal loop area to reduce EMI and voltage spikes. |
| VIN | Input supply rail | Primary power input for high-side switch and internal LDO bias; requires local 1-µF ceramic capacitor placed within 2 mm of pin. |
| ILIM | Current limit programming | Selects one of four peak current thresholds (48–240 mA) via resistor-to-GND; determines inductor saturation margin and short-circuit robustness. |
| SS | Soft-start timing control | Disables (shorted), fixes (open), or programs (capacitor) ramp time for FB reference; prevents output overshoot and inrush into prebiased loads. |
| RT | Mode selection & on-time setting | Short to GND selects PFM; resistor-to-GND sets COT switching frequency (e.g., 107 kΩ → ~230 kHz); enables optimization of efficiency vs. EMI. |
| PGOOD | Power-good open-drain flag | Active-low indicator signaling regulated output; requires external 10–100 kΩ pull-up; used for sequencing, fault reporting, and MCU reset coordination. |
| EN | Precision enable/UVLO input | Enables converter when >1.212 V; UVLO hysteresis set via HYS pin; allows custom input undervoltage lockout (e.g., disable below 6 V battery). |
| VOUT/FB | Feedback input | Fixed-output versions connect internally to 3.3 V or 5 V divider; adjustable version accepts external resistor divider for user-defined output (1.223 V reference). |
| HYS | UVLO hysteresis programming | Drain of internal NFET; resistor from HYS to EN divider sets UVLO hysteresis voltage - critical for stable startup during slow-rising battery conditions. |
| GND | Power ground return | Main ground reference for all internal circuits; must be connected directly to exposed thermal pad and system ground plane with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables dropout as low as 100 mV at full load - supports regulation down to VIN = VOUT + 0.1 V, critical for cold-crank automotive scenarios. |
| No loop compensation required | Reduces external component count to only inductor, input/output capacitors, and optional programming resistors - accelerates design validation and lowers cost. |
| Monotonic start-up into prebiased output | Prevents reverse current flow and output collapse when powering circuits with stored charge - essential for hot-swap and multi-rail sequencing applications. |
| Active slew-rate control | Internally limits dV/dt on SW node - reduces high-frequency EMI peaks by >10 dBµV without adding snubbers or ferrites. |
| Programmable current limit (4 levels) | Allows precise matching of inductor saturation current and fault current threshold - improves reliability and enables smaller magnetics in space-constrained designs. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Bias Rail |
|---|---|
Use Scenario: Powers SoC core logic, display interface, and audio codec in head-unit systems with wide battery voltage swing (6–16 V nominal, 3–65 V transient). IC Role / Device Role / Timing Role: Primary 5-V synchronous buck regulator providing clean, low-noise power with ultra-low standby IQ to meet OEM sleep-mode requirements. Use Value: 10.5 µA quiescent current extends parked vehicle battery life; 65-V max input withstands load-dump transients without external TVS clamping. | Use Scenario: Supplies 3.3-V bias to CMOS image sensor and ISP in forward-facing camera modules mounted behind windshield. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC converter operating in engine bay ambient up to 105°C ambient (150°C junction). Use Value: VSON package with exposed pad enables >100 mW dissipation at 150°C; AEC-Q100 Grade 1 qualification ensures reliability over 15-year vehicle lifetime. |
| Telematics Control Unit (TCU) LDO Replacement | Body Control Module (BCM) Sensor Hub |
Use Scenario: Replaces inefficient linear regulators in LTE/GNSS modem power domains where input voltage exceeds output by >2 V. IC Role / Device Role / Timing Role: High-efficiency step-down converter delivering 150 mA at 3.3 V from 12-V vehicle bus, eliminating thermal derating issues. Use Value: >85% efficiency at 100 mA (VIN = 12 V) reduces heat generation by >90% vs. LDO; eliminates need for heatsinks or airflow in sealed enclosures. | Use Scenario: Powers multiple LIN transceivers, door-lock actuators, and ambient light sensors in centralized BCM with shared 12-V input rail. IC Role / Device Role / Timing Role: Programmable current-limited buck stage providing fault-isolated 5-V rail with PGOOD sequencing and thermal foldback. Use Value: Four-level ILIM setting allows tailoring short-circuit current to actuator inrush; PGOOD enables safe power-up sequence before enabling downstream LIN communication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDGSRQ1 | Same AEC-Q100 Grade 1 rating, but 3–100 V input range and 200 mA output; higher IQ (15 µA) and no PFM mode; uses external MOSFETs. | Better suited for higher-input-voltage systems (e.g., 48-V mild-hybrid architectures); requires more external components and layout effort. | Select LM5164QDGSRQ1 only when input exceeds 65 V or output current >150 mA is needed; avoid if ultra-low IQ or minimal BOM is critical. |
| TPS63060-Q1 | Buck-boost topology; 2.5–12 V input; 1.8–5.5 V adjustable output; 1-A output; 25 µA IQ; requires external inductor and MOSFETs. | Supports output regulation even when VIN drops below VOUT - ideal for backup power paths and dual-battery systems. | Choose TPS63060-Q1 when input voltage may fall below output (e.g., start-stop systems); not suitable as direct replacement due to different topology and pinout. |
Compared with LM5164QDGSRQ1 and TPS63060-Q1, the LM5165QDGSRQ1 offers the lowest quiescent current and smallest solution size for fixed 3.3/5-V or adjustable outputs in 3–65-V automotive applications, with integrated switches eliminating gate-drive complexity and reducing EMI risk.
Availability
LM5165QDGSRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for LM5165QDGSRQ1 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 deep expertise in automotive-grade reliability and functional safety.
The LM5165-Q1 belongs to TI's automotive DC-DC converter product line, designed specifically for high-voltage, ultra-low-IQ power conversion in engine control, infotainment, and ADAS subsystems operating across harsh automotive temperature and EMC environments.
FAQ
What is the maximum output current capability of the LM5165QDGSRQ1?
The LM5165QDGSRQ1 delivers up to 150 mA of continuous DC output current in Constant On-Time (COT) mode at 5 V output and typical ambient conditions. In Pulse Frequency Modulation (PFM) mode, the rated output current is 100 mA. Actual current depends on input voltage, ambient temperature, PCB thermal design, and inductor selection - the device includes programmable current limiting (four levels) to match specific load requirements and prevent thermal overload.
Does the LM5165QDGSRQ1 support 100% duty-cycle operation, and why does it matter?
Yes, the LM5165QDGSRQ1 supports true 100% duty-cycle operation using its integrated high-side P-channel MOSFET. This eliminates the need for a bootstrap capacitor and enables regulation when input voltage approaches or equals the output voltage - critical for automotive cold-crank scenarios where battery voltage can drop to 3 V while maintaining a stable 3.3-V or 5-V rail. It directly improves system uptime and simplifies power architecture.
How is EMI performance achieved in the LM5165QDGSRQ1 without external filters?
The LM5165QDGSRQ1 achieves EN55022/CISPR 22 Class B compliance through integrated active slew-rate control on the SW node, optimized internal gate drive timing, and minimized parasitic loop areas enabled by the VSON package and pinout. These features suppress high-frequency harmonics at the source, allowing compliant operation with only standard input/output capacitors and a single inductor - no additional ferrite beads or common-mode chokes required in most layouts.
Can the LM5165QDGSRQ1 be used with an adjustable output voltage, and what is the reference accuracy?
Yes, the LM5165QDGSRQ1 supports adjustable output voltage via the FB pin using an external resistor divider. Its internal voltage reference is 1.223 V with ±1% initial accuracy (1.205 V to 1.241 V) over –40°C to +125°C junction temperature. Line regulation is 0.001%/V, ensuring stable output across the full 3–65-V input range - making it suitable for precision bias supplies in sensor and ADC front-ends.
What thermal protection features does the LM5165QDGSRQ1 include?
The LM5165QDGSRQ1 incorporates thermal shutdown protection that activates at 170°C junction temperature, with 10°C hysteresis to prevent oscillation near the trip point. Upon shutdown, the device halts switching and enters a low-power state until temperature falls below 160°C, then automatically resumes operation. This behavior protects against sustained overload, poor PCB heatsinking, or high ambient conditions - a key requirement for under-hood automotive deployments.
LM5165QDGSRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm 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):
- 3V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 65V
- Current - Output:
- 150mA
- Frequency - Switching:
- 50kHz ~ 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
LM5165QDGSRQ1 FAQ
1.How can I place an order for LM5165QDGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5165QDGSRQ1 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 LM5165QDGSRQ1 reliable?
The price and inventory of LM5165QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5165QDGSRQ1 is usually 5 days.
3.What payment methods are accepted for LM5165QDGSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5165QDGSRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5165QDGSRQ1?
LM5165QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5165QDGSRQ1 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 LM5165QDGSRQ1?
For technical support, including LM5165QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5165QDGSRQ1 requirements.
6.How does Aetrix verify that LM5165QDGSRQ1 is sourced from the original manufacturer or authorized distributors?
All LM5165QDGSRQ1 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 LM5165QDGSRQ1 meets industry standards.
7.What is the process for return or replacement of LM5165QDGSRQ1?
All LM5165QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM5165QDGSRQ1, 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 LM5165QDGSRQ1 part is unused and in its original packaging.
Return procedure for LM5165QDGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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