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Texas Instruments LMS36553QRNLTQ1
- Part No.:
- LMS36553QRNLTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LMS36553QRNLTQ1.pdf
- Description:
- IC REG BUCK 3.3V 5.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,007
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Product details
Overview
LMS36553QRNLTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 5.5-A continuous output at 3.3 V, with 36-V max input, 400-kHz fixed switching frequency, and integrated high- and low-side MOSFETs. It operates from –40°C to +125°C ambient, supports external frequency synchronization, and features a built-in open-drain RESET output with 3-ms release timer-used in driver monitoring and surround-view ECU power rails.
For engineers reviewing the LMS36553QRNLTQ1 datasheet, LMS36553QRNLTQ1 pinout, LMS36553QRNLTQ1 application, or LMS36553QRNLTQ1 equivalent, key selection criteria include its 3.3-V fixed output, 5.5-A load capability, wettable-flank VQFN-22 package, automotive-grade thermal robustness (150°C junction), and integrated soft-start/compensation eliminating external loop components.
Technical Context
The LMS36553QRNLTQ1 implements peak current mode control with internal compensation, enabling stable regulation across 3.9–36-V input while maintaining 400-kHz ±10% switching frequency. Its flip-chip VQFN construction minimizes switch-node ringing and conducted EMI, supported by integrated bootstrap circuitry (CBOOT-to-SW) and dual PVIN/PGND paths for low-inductance power delivery.
It features automatic light-load PFM/PWM transition and pin-selectable forced PWM mode via FPWM input, with built-in protection including thermal shutdown (160–185°C trip), overcurrent limiting (HS: 6.7–9.5 A, LS: 6–7.5 A), and input UVLO (3.2–3.9 V rising). The RESET output provides filtered system-status indication referenced to VOUT with ±1% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% to ±3% regulation over full load and temperature range |
| Max Continuous Output Current | 5.5 A - enables single-regulator supply for multi-rail automotive ECUs without parallel stages |
| Input Voltage Range | 3.9 V to 36 V - supports 12-V and 24-V automotive batteries with 42-V transient tolerance (≤500 ms) |
| Switching Frequency | 400 kHz ±10% - allows compact 2.2-µH inductors and reduces EMI filtering burden |
| Quiescent Current (IQ_VIN) | 18 µA at 3.3 VOUT, no load - extends battery life in always-on vehicle subsystems |
| Dropout Voltage | 0.65–0.85 V at 5.5 A - maintains regulation down to ~4.15 V input at 3.3 VOUT |
| RESET Threshold Accuracy | Rising: 105–110% of VOUT; Falling: 92–96.5% - ensures reliable power-good signaling without external supervisor |
Pinout & Package
Package: VQFN-22 (RNL), 4.0 mm × 5.0 mm, wettable flanks, exposed thermal pad (PGND-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Internal LDO output | 3.1-V bias rail for control circuitry; requires 4.7-µF ceramic capacitor to AGND |
| 2 CBOOT | Bootstrap capacitor node | Connects 470-nF capacitor to SW; enables high-side gate drive above VIN |
| 3 SYNC | Frequency sync input | Accepts 250–500 kHz external clock (rising-edge triggered); overrides internal oscillator |
| 4,14 PVIN1/PVIN2 | Main power inputs | Dual high-current VIN paths; must be shorted together on PCB for low-impedance routing |
| 5,10,11 PGND1/PGND2/PGND3 | Power ground terminals | Low-inductance return paths for internal MOSFETs; tied directly to thermal pad and AGND |
| 9 SW | Switch node | Connects to inductor; high dv/dt node requiring tight layout and guard ring |
| 15 AVIN | Analog supply input | Bias source for error amplifier and reference; connected to PVIN on PCB |
| 16 FPWM | Mode control input | High = forced PWM (no PFM); low = automatic light-load mode; must not float |
| 18 EN | Enable input | Active-high logic; 1.7–2.0 V threshold; internal hysteresis prevents chatter during slow-rising supplies |
| 19 RESET | Open-drain status flag | Asserts low on fault or EN deactivation; includes 24-µs glitch filter and 3-ms release timer |
| 20 AGND | Analog ground reference | Star point for FB, VCC, and BIAS; isolated from PGND except at single PCB tie-point |
| 21 FB | Feedback input | Direct connection to 3.3-V output (fixed version); no external divider required |
| 22 BIAS | Auxiliary bias input | Connected to output for improved efficiency; grounded or externally powered if VOUT > 15 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side MOSFETs | RDS(on) = 60–130 mΩ (HS) and 40–80 mΩ (LS) - eliminates external power switches and reduces BOM count |
| Automotive AEC-Q100 Grade 1 qualification | –40°C to +125°C ambient operation with HBM ±2.5 kV / CDM ±1 kV - validated for under-hood deployment |
| Built-in compensation and soft-start | 2.5–5 ms ramp time; no external RC network needed - simplifies design and improves startup reliability |
| Low EMI switch-node waveform | Flip-chip VQFN layout with partial magnetic field cancellation - reduces radiated emissions without snubbers |
| RESET output with internal timing | 3-ms release delay and 24-µs glitch filter - replaces discrete supervisor IC and saves board space |
| Wide input range with frequency foldback | Regulates 3.3 V from as low as 3.5 V input - supports cold-crank scenarios in 12-V systems |
Applications
| Automotive USB Charge | Driver Monitoring System |
|---|---|
Use Scenario: Powering dual-lane USB Type-C ports in center console with BC1.2 compliance and overvoltage protection. IC Role / Device Role / Timing Role: Primary 3.3-V rail generator for USB controller, PD PHY, and level-shifters; delivers stable voltage during engine cranking transients. Use Value: 5.5-A rating supports simultaneous charging of two devices; 42-V transient tolerance eliminates need for upstream TVS clamping. |
Use Scenario: Supplying image signal processor (ISP), CMOS sensor interface, and eye-tracking ASIC in cabin-facing camera module. IC Role / Device Role / Timing Role: Main 3.3-V power stage for real-time vision processing subsystem; RESET output synchronizes firmware boot sequence. Use Value: Low 18-µA quiescent current extends sleep-mode battery life; wettable flanks enable AOI inspection for zero-defect automotive manufacturing. |
| Surround View System ECU | Mechanically Scanning LIDAR |
Use Scenario: Powering four-channel video decoder SoC, Ethernet PHY, and CAN FD transceiver in 360° camera fusion controller. IC Role / Device Role / Timing Role: High-current 3.3-V source for multi-core processor and memory interfaces; SYNC input aligns switching to system clock tree. Use Value: 400-kHz fixed frequency enables predictable EMI filtering; integrated current limits protect against shorted camera cable faults. |
Use Scenario: Generating clean 3.3-V bias for MEMS mirror drivers, laser diode monitor ADCs, and time-of-flight timing circuits. IC Role / Device Role / Timing Role: Precision low-noise supply for analog front-end and high-speed timing references; low dropout ensures operation during battery sag. Use Value: Minimal switch-node ringing preserves signal integrity in ns-level ToF measurements; thermal shutdown (160°C) prevents lens misalignment from overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 4.5-A rated, 2.5-V to 36-V input, 400-kHz sync-capable, but lacks integrated RESET output and wettable flanks | Suitable for non-safety-critical 3.3-V rails where external supervision is acceptable | Choose when lower cost and footprint are prioritized over integrated system monitoring |
| TPS54560QDGRRQ1 | 5.5-A rated, 3.5-V to 60-V input, adjustable output only, no fixed 3.3-V option or RESET pin | Requires external feedback divider and supervisor IC; better for wide-input industrial use than automotive ECU integration | Prefer when input exceeds 36 V or adjustable output is mandatory |
Compared with LM61480QRNXTQ1 and TPS54560QDGRRQ1, the LMS36553QRNLTQ1 uniquely combines fixed 3.3-V output, automotive-grade RESET functionality, wettable-flank packaging, and guaranteed 5.5-A delivery in a single AEC-Q100-compliant device-reducing total system component count and validation effort.
Availability
LMS36553QRNLTQ1 is available at Aetrix Electronics and suitable for automotive USB charge, driver monitoring, surround view system ECU, and mechanically scanning LIDAR applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LMS36553QRNLTQ1 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 automotive electronics, with decades of automotive qualification expertise and broad power management portfolio.
The LMS36553QRNLTQ1 belongs to TI's LMS36x5-Q1 family of high-current synchronous buck converters designed specifically for demanding automotive power rails-emphasizing low EMI, high efficiency across light-to-full load, and integrated system-level features like RESET and synchronization.
FAQ
What is the maximum output current capability of the LMS36553QRNLTQ1?
The LMS36553QRNLTQ1 delivers up to 5.5 A continuous output current at 3.3 V under recommended operating conditions (–40°C to +125°C ambient, proper PCB thermal design). This rating is validated per AEC-Q100 stress testing and accounts for internal MOSFET RDS(on), thermal derating, and current-limit thresholds specified in the datasheet. The LMS36553QRNLTQ1 achieves this with no external current-sense resistors or parallel phases.
Does the LMS36553QRNLTQ1 require external compensation components?
No, the LMS36553QRNLTQ1 features fully integrated compensation circuitry optimized for its internal control loop. Unlike many buck controllers, it does not require external type-II or type-III compensation networks. This simplifies layout, reduces BOM count, and ensures stability across its full input/output operating range-verified by TI's characterization and included in the typical application schematic for the LMS36553QRNLTQ1.
How does the RESET output of the LMS36553QRNLTQ1 function during power-up and fault conditions?
The LMS36553QRNLTQ1 RESET output is an open-drain flag that goes low when EN is deasserted, output voltage falls below 92–96.5% of nominal 3.3 V, or thermal shutdown activates. After fault clearance, it remains low for a fixed 3-ms release timer before going high-impedance. During power-up, RESET stays low until the soft-start completes and output reaches regulation-ensuring synchronized boot of downstream processors using the LMS36553QRNLTQ1.
Can the LMS36553QRNLTQ1 operate with an input voltage below 3.9 V?
Yes-the LMS36553QRNLTQ1 supports extended low-input operation down to 3.5 V after startup, enabled by its frequency foldback architecture. However, full 5.5-A output capability and 3.3-V regulation accuracy are only guaranteed above 3.8 V input. Below 3.5 V, the device may cease switching or enter dropout; the minimum operating input is 3.2 V (rising) per UVLO specification, but sustained regulation at 3.3 V requires ≥3.5 V input per LMS36553QRNLTQ1 datasheet Section 7.7.
What package and assembly features make the LMS36553QRNLTQ1 suitable for automotive production?
The LMS36553QRNLTQ1 uses a VQFN-22 (RNL) package with wettable flanks, enabling automated optical inspection (AOI) of solder joints without x-ray. It is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), features HBM ±2.5 kV / CDM ±1 kV ESD protection, and undergoes rigorous automotive process controls. These attributes-combined with its integrated RESET and thermal shutdown-make the LMS36553QRNLTQ1 compliant with IATF 16949 manufacturing requirements for zero-defect automotive electronics.
LMS36553QRNLTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 22-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.9V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 5.5A
- Frequency - Switching:
- 250kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 22-VQFN-HR (5x4)
LMS36553QRNLTQ1 FAQ
1.How can I place an order for LMS36553QRNLTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMS36553QRNLTQ1 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 LMS36553QRNLTQ1 reliable?
The price and inventory of LMS36553QRNLTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMS36553QRNLTQ1 is usually 5 days.
3.What payment methods are accepted for LMS36553QRNLTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMS36553QRNLTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMS36553QRNLTQ1?
LMS36553QRNLTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMS36553QRNLTQ1 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 LMS36553QRNLTQ1?
For technical support, including LMS36553QRNLTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMS36553QRNLTQ1 requirements.
6.How does Aetrix verify that LMS36553QRNLTQ1 is sourced from the original manufacturer or authorized distributors?
All LMS36553QRNLTQ1 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 LMS36553QRNLTQ1 meets industry standards.
7.What is the process for return or replacement of LMS36553QRNLTQ1?
All LMS36553QRNLTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMS36553QRNLTQ1, 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 LMS36553QRNLTQ1 part is unused and in its original packaging.
Return procedure for LMS36553QRNLTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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