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Texas Instruments LM5165DRCR
- Part No.:
- LM5165DRCR
- Manufacturer:
- Texas Instruments
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
LM5165DRCR.pdf
- Description:
- IC REG BUCK ADJ 150MA 10VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,624
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Product details
Overview
LM5165DRCR from Texas Instruments is a 3-V to 65-V input, 150-mA synchronous buck converter with ultra-low 10.5-µA no-load quiescent current, integrated 2-Ω PMOS high-side and 1-Ω NMOS low-side switches, and support for fixed (3.3 V/5 V) or adjustable output voltage - deployed in industrial control systems, 4–20 mA loop-powered sensors, and high-voltage LDO replacement applications.
For engineers reviewing the LM5165DRCR datasheet, LM5165DRCR pinout, LM5165DRCR application, or LM5165DRCR equivalent, this page delivers verified technical context, confirmed pin functions, real-world efficiency curves across VIN/VOUT combinations, validated soft-start and current-limit programming methods, and precise PFM/COT mode selection criteria - all aligned to TI's SNVSA47D revision D specification.
Technical Context
The LM5165DRCR implements a Constant On-Time (COT) or Pulse Frequency Modulation (PFM) control architecture with no external loop compensation required. Its COT mode uses VIN feedforward to maintain near-constant frequency across 3–65 V input, while PFM enables diode emulation and pulse skipping for >85% efficiency at 0.1 mA load.
It integrates a 100%-duty-cycle-capable PMOS high-side switch (eliminating bootstrap capacitor need) and NMOS synchronous rectifier (replacing external diode), with monotonic start-up into prebiased outputs and active slew-rate control to meet EN55022/CISPR 22 Class B EMI limits without shielding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 65 V - supports direct connection to 48-V industrial buses, automotive batteries, and unregulated HV rails without pre-regulation. |
| No-Load Quiescent Current | 10.5 µA - enables multi-year battery life in always-on 4–20 mA sensor nodes. |
| Max Output Current | 150 mA in COT mode - sufficient for biasing microcontrollers, ADCs, and isolated gate drivers in compact space-constrained designs. |
| Output Voltage Options | Adjustable (via FB pin, 1.223 V reference) or fixed 3.3 V / 5 V - eliminates external feedback resistors for standard rail generation. |
| Switching Architecture | Selectable PFM or COT - PFM maximizes light-load efficiency; COT delivers fast transient response and predictable frequency for EMI filtering. |
| Current Limit Programmability | Four discrete levels (48–264 mA) set by ILIM-to-GND resistor - allows precise inductor sizing for thermal and ripple optimization. |
| Soft-Start Options | Internally fixed 900 µs, disabled (immediate ramp), or externally programmable via SS capacitor - prevents inrush into capacitive loads. |
| Package | VSON-10 (DRC), 3 mm × 3 mm, 0.5-mm pitch, exposed thermal pad - enables high-power-density layouts with low θJB = 22.1°C/W. |
Pinout & Package
VSON-10 (DRC) package: 3 mm × 3 mm body, 0.5-mm pin pitch, thermally enhanced exposed pad soldered to PCB ground plane for optimal power dissipation (RθJB = 22.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Internal connection point of high-side PMOS drain and low-side NMOS drain - must be routed with minimal loop area to inductor and CIN for EMI control. |
| 2 VIN | Input supply | Primary power input for high-side MOSFET and internal LDO - requires low-ESR ceramic capacitor placed within 2 mm of pin. |
| 3 ILIM | Current limit select | Resistor-to-GND sets one of four peak current thresholds (48/100/155/240 mA) - determines inductor saturation margin and short-circuit protection level. |
| 4 SS | Soft-start control | Capacitor-to-GND programs ramp time; open circuit = 900 µs internal ramp; short to GND = immediate startup - prevents output overshoot into prebiased loads. |
| 5 RT | Mode select & on-time | Short to GND = PFM; resistor-to-GND = COT with programmable switching frequency - defines control law and transient behavior. |
| 6 PGOOD | Power-good flag | Open-drain NFET output pulled high externally - asserts low when VOUT drops below 94% of regulation threshold, enabling sequencing and fault reporting. |
| 7 EN | Enable input | Logic-level enable with 1.212 V threshold and 68 mV hysteresis - supports programmable UVLO using HYS pin and external resistor divider. |
| 8 VOUT/FB | Feedback input | Connects to internal resistor divider (fixed 3.3/5 V) or external divider (adjustable) - 1.223 V ±1% reference enables ±1% output accuracy. |
| 9 HYS | UVLO hysteresis | Drain of internal NFET - external resistor from HYS to EN divider sets hysteresis width for clean input undervoltage lockout recovery. |
| 10 GND | Ground return | Power and signal ground reference - must be connected directly to exposed thermal pad for thermal and noise integrity. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables dropout as low as VOUT – 0.1 V at full load - critical for high-VIN, low-VOUT conversion (e.g., 65 V → 5 V) without input pre-regulation. |
| No loop compensation required | Reduces BOM count by eliminating 3–4 external compensation components - accelerates design cycle and improves production yield consistency. |
| Active slew-rate control | Internally shapes SW node edge rates to suppress high-frequency EMI peaks - meets EN55022 Class B without ferrite beads or shielded inductors. |
| Monotonic start-up into prebiased output | Prevents reverse current flow during power-up when VOUT is already biased - essential for hot-swap and redundant power systems. |
| Diode emulation + pulse skipping | Maintains >80% efficiency down to 10 µA load in PFM mode - extends battery runtime in intermittent-sensing IoT endpoints. |
| Thermal shutdown with hysteresis | Triggers at 170°C junction temperature with 10°C hysteresis - ensures reliable self-protection during overload or poor heatsinking without oscillation. |
Applications
| 4–20 mA Loop-Powered Sensors | Industrial Control Systems |
|---|---|
Use Scenario: Powering analog sensor front-ends and signal conditioners from a 24-V loop supply with strict <100-µA quiescent budget. IC Role / Device Role / Timing Role: Primary DC-DC regulator generating stable 3.3-V or 5-V bias rail directly from loop voltage - operates in PFM mode to minimize idle current draw. Use Value: Enables >10-year battery-free operation using only loop energy; 10.5-µA IQ ensures compliance with HART protocol current headroom requirements. |
Use Scenario: Providing isolated auxiliary rails for PLC I/O modules, motor drives, and fieldbus transceivers in harsh factory environments. IC Role / Device Role / Timing Role: Compact, high-input-voltage buck converter delivering 150-mA 5-V rail for microcontrollers and interface ICs - selected in COT mode for fast load-step response to digital logic switching. Use Value: Eliminates need for bulky 78L05-style LDOs; 65-V max input withstands 48-V bus transients per IEC 61000-4-5; VSON-10 footprint saves >40% board area vs. SOIC-8 alternatives. |
| Automotive Battery-Powered Equipment | High-Voltage LDO Replacement |
Use Scenario: Regulating power for telematics ECUs, ADAS cameras, and infotainment peripherals across cold-crank (4.5 V) to load-dump (65 V) conditions. IC Role / Device Role / Timing Role: Input-tolerant synchronous buck replacing inefficient linear regulators - uses EN pin with programmable UVLO to disable during cranking and re-enable post-cranking. Use Value: Delivers 150-mA output with <15-µA shutdown current and 170°C thermal shutdown - survives under-hood temperatures and battery fault events without derating. |
Use Scenario: Replacing 78xx-series LDOs in legacy 24-V or 48-V systems where heat sink space is unavailable and efficiency matters. IC Role / Device Role / Timing Role: High-efficiency step-down converter delivering 3.3 V/5 V at up to 150 mA - configured in COT mode for stable 230-kHz operation and low output ripple. Use Value: Reduces power loss from >2 W (LDO) to <0.2 W (LM5165DRCR @ 24 V → 5 V), eliminating thermal runaway risk and enabling fully sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5166DRCR | Pin-to-pin compatible, identical pinout and feature set, but rated for 3–100 V input and 200-mA output - higher voltage headroom and current capability. | Better suited for 72-V telecom or railway applications requiring extended input range beyond 65 V. | Select LM5166DRCR if system VIN may exceed 65 V or sustained load exceeds 150 mA; otherwise LM5165DRCR offers optimized cost and thermal performance at 65-V max. |
| TPS63060DSCR | Buck-boost topology, 1.8–5.5 V input, 2.5–5.5 V output, 1-A continuous - not pin-compatible; requires different layout and control scheme. | Used where input can fall below output (e.g., single-cell Li-ion backup); LM5165DRCR is strictly buck-only with 3–65 V input. | Choose TPS63060DSCR only when input voltage dips below regulated output; LM5165DRCR remains preferred for high-VIN step-down with ultra-low IQ. |
Compared with LM5166DRCR, LM5165DRCR trades 35-V input headroom and +50-mA output for lower cost and tighter thermal resistance in VSON-10; versus TPS63060DSCR, it delivers superior efficiency above 5 V input but lacks buck-boost flexibility - making LM5165DRCR the optimal choice for fixed high-VIN, low-IQ, step-down-only systems.
Availability
LM5165DRCR is available at Aetrix Electronics and suitable for industrial control systems, 4–20 mA loop-powered sensors, and automotive battery-powered equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
Supply support for LM5165DRCR 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 connectivity technologies - serving industrial, automotive, and communications markets with high-reliability, application-optimized silicon.
The LM5165DRCR belongs to TI's high-voltage DC-DC converter product line, designed specifically for space-constrained, wide-input industrial and automotive power supplies demanding ultra-low quiescent current and robust EMI performance.
FAQ
What is the maximum input voltage rating for the LM5165DRCR?
The LM5165DRCR has an absolute maximum input voltage rating of 68 V and a recommended operating maximum of 65 V per TI SNVSA47D Rev D. It is qualified for continuous operation from 3 V to 65 V, making it suitable for 48-V industrial buses and automotive load-dump conditions. Exceeding 65 V risks violating recommended operating conditions and may impact reliability or thermal performance.
Does the LM5165DRCR require external compensation components?
No, the LM5165DRCR does not require external compensation components in either PFM or COT operating modes. Its control architecture is inherently stable across the full input and load range, eliminating the need for type-II or type-III compensation networks. This simplifies design, reduces BOM count, and improves production consistency - a key advantage confirmed in Section 7.1 of the LM5165DRCR datasheet.
How is the output voltage configured on the LM5165DRCR?
The LM5165DRCR supports both fixed and adjustable output configurations. The LM5165DRCR itself is the adjustable version: connect an external resistor divider from VOUT/FB to GND to set output voltage using the internal 1.223-V reference. Fixed 3.3-V (LM5165Y) and 5-V (LM5165X) variants use internal dividers - the LM5165DRCR part number explicitly denotes the adjustable variant in VSON-10 packaging.
What are the supported switching modes for the LM5165DRCR?
The LM5165DRCR supports two selectable switching modes: Pulse Frequency Modulation (PFM) and Constant On-Time (COT). PFM is enabled by shorting the RT pin to GND and optimizes light-load efficiency. COT is enabled by connecting a resistor from RT to GND and provides nearly constant frequency and fast transient response. Mode selection is hardware-configured and does not require firmware or external clock signals.
Can the LM5165DRCR operate with 100% duty cycle?
Yes, the LM5165DRCR supports true 100% duty cycle operation due to its integrated high-side PMOS switch - no bootstrap capacitor is needed. This enables minimum dropout operation (e.g., 5.1 V out from 5.2 V in), critical for high-input, low-output voltage conversions like 65 V → 5 V without pre-regulation. The feature is explicitly documented in Section 7.3.1 and Figure 7-1 of the LM5165DRCR datasheet.
LM5165DRCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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):
- 1.223V
- Voltage - Output (Max):
- 65V
- Current - Output:
- 150mA
- Frequency - Switching:
- Up to 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSON (3x3)
LM5165DRCR FAQ
1.How can I place an order for LM5165DRCR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5165DRCR 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 LM5165DRCR reliable?
The price and inventory of LM5165DRCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5165DRCR is usually 5 days.
3.What payment methods are accepted for LM5165DRCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5165DRCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5165DRCR?
LM5165DRCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5165DRCR 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 LM5165DRCR?
For technical support, including LM5165DRCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5165DRCR requirements.
6.How does Aetrix verify that LM5165DRCR is sourced from the original manufacturer or authorized distributors?
All LM5165DRCR 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 LM5165DRCR meets industry standards.
7.What is the process for return or replacement of LM5165DRCR?
All LM5165DRCR units undergo pre-shipment inspection (PSI). If there is an issue with LM5165DRCR, 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 LM5165DRCR part is unused and in its original packaging.
Return procedure for LM5165DRCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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