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Texas Instruments LM536253QRNLRQ1
- Part No.:
- LM536253QRNLRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerVFQFN
- Datasheet:
-
LM536253QRNLRQ1.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 22VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM536253QRNLRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC-DC converter delivering a fixed 3.3-V output at up to 2.5 A, operating from 3.9 V to 36 V input with 2.1-MHz switching frequency, ±1% output voltage tolerance over –40°C to +125°C, and 15-µA quiescent current - deployed in instrument clusters and telematics head units.
For engineers reviewing the LM536253QRNLRQ1 datasheet, LM536253QRNLRQ1 pinout, LM536253QRNLRQ1 application, or LM536253QRNLRQ1 equivalent, key selection criteria include its wettable-flank VQFN-22 package, integrated RESET with 3-ms release timer, external frequency synchronization capability, and forced PWM mode via FPWM pin - all critical for automotive power rail design compliance and EMI-sensitive layouts.
Technical Context
The LM536253QRNLRQ1 implements peak-current-mode control with adaptive off-time extension to sustain regulation down to 300-mV dropout at 3.5 A (per family spec), enabling stable 3.3-V output from as low as 3.55-V input. Its 2.1-MHz fixed-frequency operation avoids AM-band interference and supports compact 2.2-µH inductors.
It integrates dual MOSFETs (HS RDSON ≤130 mΩ, LS RDSON ≤80 mΩ), internal compensation, soft-start (3.2 ms), thermal shutdown (155°C trip), and a dedicated BIAS pin for efficiency optimization. The HotRod QFN package reduces parasitic inductance, minimizing switch-node ringing and radiated EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V, ±1% tolerance over –40°C to +125°C junction temperature - ensures stable MCU/SOC core rail under automotive thermal cycling. |
| Max Output Current | 2.5 A continuous - matches LM53625-Q1 variant rating; sufficient for infotainment SoC I/O rails and display backlight drivers. |
| Input Voltage Range | 3.9 V to 36 V, with 42-V/500-ms transient tolerance - eliminates need for upstream TVS or load switch in 12-V/24-V vehicle systems. |
| Switching Frequency | 2.1 MHz nominal, ±3% spread-spectrum option - enables small passive filtering and avoids AM radio band (530–1710 kHz). |
| Quiescent Current | 15 µA typical at no load (3.3-V output) - sustains battery-powered sleep modes without auxiliary LDO. |
| Package | VQFN-HR (RNL), 5.0 mm × 4.0 mm, 22-pin, wettable flanks - supports automated optical solder-joint inspection per automotive AEC standards. |
| RESET Output | Open-drain, internally filtered, 3-ms release delay - replaces discrete supervisor IC for system power-good signaling. |
Pinout & Package
VQFN-HR (RNL) 22-pin package with 0.6-mm pin pitch, exposed thermal pad, and wettable flanks for solder inspection. Body size: 5.00 mm × 4.00 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Internal 3.1-V LDO output | Supplies internal control circuitry; requires 4.7-µF capacitor to AGND for stability. |
| CBOOT | Bootstrap capacitor node | Connects 470-nF capacitor to SW; enables high-side gate drive above VIN. |
| SYNC | Frequency synchronization input | Accepts 1.9–2.3 MHz external clock (rising-edge triggered); enables multi-rail timing coherence. |
| PVIN1 / PVIN2 | Main power input terminals | Dual high-current VIN paths; must be shorted on PCB to minimize loop inductance. |
| SW | Switch node | Connects to power inductor; high dv/dt node requiring tight layout and ground shielding. |
| PGND1 / PGND2 | Power ground terminals | Eight total PGND pins; must tie together and connect directly to AGND and system ground plane. |
| AVIN | Analog input supply reference | Connected to PVIN on PCB; supplies analog circuitry including error amplifier and reference. |
| FPWM | Forced PWM mode control | High = fixed 2.1-MHz operation; low = automatic light-load diode emulation mode. |
| EN | Enable input | Active-high; 1.7–2.0 V threshold; must not float; supports direct connection to VIN. |
| RESET | Open-drain power-good flag | Asserts low during fault or EN=low; requires external pull-up; 3-ms release timer prevents chatter. |
| FB | Feedback input | Internally connected to 3.3-V divider; no external resistors required for fixed-output configuration. |
| BIAS | Auxiliary bias supply input | Connected to output rail; improves light-load efficiency by powering internal LDO from regulated VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated HotRod QFN package | Reduces parasitic inductance by >50% vs standard QFN, suppressing switch-node ringing and lowering radiated EMI by 10 dB. |
| Adaptive frequency spreading | Smoothly extends off-time near dropout, enabling 98% duty cycle and 300-mV dropout regulation - critical for cold-crank scenarios. |
| Built-in RESET with filter & timer | Eliminates external supervisor IC; 12–45 µs glitch filter and 3-ms release delay ensure robust system reset sequencing. |
| Pin-selectable forced PWM mode | FPWM pin disables light-load diode emulation, guaranteeing constant 2.1-MHz switching for predictable EMI and transient response. |
| Low-noise peak-current-mode control | Stable with ceramic output capacitors ≥22 µF; insensitive to ESR variation; maintains regulation across wide VIN/VOUT ratios. |
Applications
| Instrumentation Cluster | Telematics Control Unit |
|---|---|
Use Scenario: Powering digital gauges, CAN transceivers, and microcontrollers in vehicle dashboards under wide ambient temperature and load transients. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying core logic and communication interfaces. Use Value: 15-µA quiescent current extends battery life during ignition-off; AEC-Q100 Grade 1 qualification ensures reliability at 125°C ambient. |
Use Scenario: Supplying GPS module, cellular modem, and application processor in connected car platforms with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency, low-EMI 3.3-V power rail synchronized to system clock via SYNC pin. Use Value: Spread-spectrum operation and HotRod packaging reduce radiated emissions below CISPR 25 Class 5 limits. |
| Head Unit Audio Subsystem | ADAS Camera Power Module |
Use Scenario: Delivering clean 3.3-V bias to audio codecs and DSPs in infotainment head units with minimal noise coupling. IC Role / Device Role / Timing Role: Low-noise buck converter with integrated compensation and BIAS pin optimization. Use Value: 2.1-MHz switching moves noise spectrum away from audio band; BIAS connection improves light-load PSRR by 15 dB. |
Use Scenario: Powering image sensor and ISP in rear-view or surround-view cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Automotive-grade 3.3-V supply with thermal shutdown (155°C) and 150°C max junction rating. Use Value: Junction temperature range up to +150°C supports placement near heat sources; wettable flanks enable AOI verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM536353QRNLRQ1 | 3.5-A rated output, higher HS/LS current limits (4.5–6 A / 3.5–4.5 A), same 3.3-V fixed output and pinout. | Required where peak load exceeds 2.5 A (e.g., multi-camera ADAS modules with burst processing). | Select when higher current headroom is needed; identical layout and firmware interface. |
| TPS543320RTVR | 3-A, 18-V max input, 2.2-MHz sync-capable buck; no spread spectrum; different pinout and BIAS requirement. | Suitable for non-automotive industrial applications where AEC-Q100 is not mandated and EMI margin is less constrained. | Choose only if automotive qualification is unnecessary; requires PCB redesign and new layout validation. |
Compared with LM536353QRNLRQ1, the LM536253QRNLRQ1 offers lower cost and thermal footprint for sub-2.5-A loads; versus TPS543320RTVR, it provides mandatory AEC-Q100 Grade 1, spread-spectrum EMI reduction, and wettable-flank inspection - essential for production automotive programs.
Availability
LM536253QRNLRQ1 is available at Aetrix Electronics and suitable for instrumentation clusters, telematics control units, and head unit subsystems requiring stable component supply, full AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for LM536253QRNLRQ1 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 ICs, with decades of automotive power management expertise and ISO/TS 16949-certified manufacturing.
The LM536xx-Q1 product line delivers high-efficiency, low-EMI, AEC-Q100-qualified DC-DC converters optimized for automotive infotainment, body electronics, and ADAS power rails - emphasizing thermal robustness, functional safety readiness, and manufacturability.
FAQ
What is the maximum junction temperature rating for the LM536253QRNLRQ1?
The LM536253QRNLRQ1 is rated for a maximum junction temperature of +150°C, with thermal shutdown triggered at 155°C (rising) and 140°C (falling hysteresis). This enables operation in under-hood environments and supports 1000-hour lifetime at 125°C junction temperature per AEC-Q100 requirements.
Does the LM536253QRNLRQ1 require external feedback resistors for its 3.3-V output?
No, the LM536253QRNLRQ1 is a fixed 3.3-V output variant - the FB pin is internally connected to the voltage divider, eliminating the need for external resistors. This reduces BOM count, board space, and potential drift errors associated with resistor tolerance and temperature coefficients.
Can the LM536253QRNLRQ1 operate with input voltage below 3.9 V?
Yes - the LM536253QRNLRQ1 supports minimum input voltage of 3.55 V after startup (per Section 7.6), enabling operation during cold-crank events. However, full functionality (including 2.1-MHz switching and ±1% regulation) requires VIN ≥ 3.9 V; below that, frequency drops and dropout increases.
How does the BIAS pin improve efficiency in the LM536253QRNLRQ1?
The BIAS pin allows the LM536253QRNLRQ1 to power its internal LDO from the regulated 3.3-V output instead of VIN, reducing power dissipation in the bias regulator. This lowers quiescent current by ~30% at light loads and improves overall efficiency, especially in battery-backed standby modes.
Is the LM536253QRNLRQ1 pin-compatible with other LM536xx-Q1 variants?
Yes - all LM53625/35-Q1 devices share identical VQFN-HR (RNL) 22-pin package, pinout, and footprint. The LM536253QRNLRQ1 is mechanically and electrically compatible with LM536353QRNLRQ1, LM536255QRNLRQ1, and adjustable variants, enabling drop-in current or voltage scaling without layout change.
LM536253QRNLRQ1 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:
- 2.5A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- 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)
LM536253QRNLRQ1 FAQ
1.How can I place an order for LM536253QRNLRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM536253QRNLRQ1 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 LM536253QRNLRQ1 reliable?
The price and inventory of LM536253QRNLRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM536253QRNLRQ1 is usually 5 days.
3.What payment methods are accepted for LM536253QRNLRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM536253QRNLRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM536253QRNLRQ1?
LM536253QRNLRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM536253QRNLRQ1 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 LM536253QRNLRQ1?
For technical support, including LM536253QRNLRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM536253QRNLRQ1 requirements.
6.How does Aetrix verify that LM536253QRNLRQ1 is sourced from the original manufacturer or authorized distributors?
All LM536253QRNLRQ1 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 LM536253QRNLRQ1 meets industry standards.
7.What is the process for return or replacement of LM536253QRNLRQ1?
All LM536253QRNLRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM536253QRNLRQ1, 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 LM536253QRNLRQ1 part is unused and in its original packaging.
Return procedure for LM536253QRNLRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM536253QRNLRQ1 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
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