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Texas Instruments LM536033QPWPRQ1
- Part No.:
- LM536033QPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM536033QPWPRQ1.pdf
- Description:
- IC REG BUCK 3.3V 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,386
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Product details
Overview
LM536033QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 3 A at 3.3 V output, operating from 3.5 V to 36 V input with 2.1 MHz fixed switching frequency, ±2% output voltage tolerance, and integrated reset flag with 2–4 ms assertion delay - used in instrument cluster power rails requiring high transient immunity and compact layout.
For engineers reviewing the LM536033QPWPRQ1 datasheet, LM536033QPWPRQ1 pinout, LM536033QPWPRQ1 application, or LM536033QPWPRQ1 equivalent, key selection criteria include its 3 A load capability, 1.7 µA shutdown current, FPWM mode control, open-drain RESET with glitch filtering, and HTSSOP-16 thermal performance under -40°C to +125°C ambient conditions.
Technical Context
The LM536033QPWPRQ1 implements a current-mode synchronous buck architecture with automatic PWM/PFM transition, enabling high light-load efficiency (24 µA no-load supply current) while maintaining tight regulation across wide VIN (3.5–36 V) and temperature (-40°C to +150°C junction). Its valley-current limiting scheme provides robust overload protection without external sensing.
It integrates loop compensation, soft-start, thermal shutdown, UVLO, and external synchronization via SYNC pin. The BIAS pin connects directly to VOUT for improved line regulation, while the internal 3.15 V VCC regulator powers control circuitry - eliminating need for external bias supplies in 3.3 V/5 V fixed-output configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A maximum continuous - supports automotive infotainment SoC core rails and display backlight drivers without derating at 85°C ambient. |
| Input Voltage Range | 3.5 V to 36 V - withstands cold-crank (3.5 V) and load-dump transients (42 V ≤500 ms), simplifying front-end surge protection. |
| Switching Frequency | 2.1 MHz nominal - enables use of small 1–2.2 µH inductors and avoids AM radio band; synchronizable via SYNC pin (1.9–2.3 MHz range). |
| Output Voltage Accuracy | ±2% over temperature and line/load - ensures reliable operation of 3.3 V logic interfaces (e.g., CAN FD transceivers, LVDS serializers) without post-regulation. |
| Shutdown Current | 1.7 µA typical - meets automotive "always-on" module quiescent requirements (e.g., telematics wake-up circuits). |
| RESET Delay | 2–4 ms assertion time - prevents false power-good signals during startup overshoot or load-step recovery. |
| Junction Temperature Range | -40°C to +150°C - qualified for under-hood placement in ADAS camera modules and radar ECUs. |
Pinout & Package
LM536033QPWPRQ1 uses a thermally enhanced 16-pin HTSSOP package (5.00 mm × 4.40 mm × 1.00 mm) with exposed thermal pad (EP) for PCB-level heat sinking. Pin 17 (EP) must be soldered to a solid ground plane for optimal thermal performance (RθJC(bot) = 1.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; pins 1 and 2 must be shorted on PCB to minimize parasitic inductance in high-di/dt path. |
| CBOOT (3) | Bootstrap supply | Requires 470 nF X7R capacitor to SW; enables high-side NMOS gate drive above VIN. |
| VCC (4) | Internal regulator output | 3.15 V supply for control logic; decouple with 3.3 µF ceramic to AGND - not for external loading. |
| BIAS (5) | Bias regulator input | Connected to VOUT (3.3 V); improves line regulation and reduces IQ by powering internal LDO from output rail. |
| SYNC (6) | Frequency sync input | Accepts 1.5–5.5 V clock signal; ties to GND if unused - never left floating. |
| FPWM (7) | Forced PWM mode control | High = fixed-frequency PWM; Low = auto PFM/PWM transition - eliminates audible noise in cabin systems. |
| RESET (8) | Open-drain fault indicator | Pulled low when VOUT <94.5% nominal; requires external pull-up (e.g., to VCC or VOUT) for logic-level signaling. |
| FB (9) | Feedback input | Internally connected to 3.3 V divider; no external resistors needed - simplifies layout and improves accuracy. |
| AGND (10) | Analog ground reference | Reference point for FB, EN, FPWM, SYNC; must connect to EP and PGND at single-point star ground. |
| EN (11) | Enable input | Active-high (≥2 V); shutdown threshold ≤0.8 V - supports direct connection to microcontroller GPIO or battery-sense circuit. |
| VIN (12,13) | Main input supply | 3.5–36 V input; pins 12 and 13 must be shorted on PCB and bypassed with ≥10 µF X7R ceramic near package. |
| N/C (14) | No connection | Unbonded die pad - leave unconnected and unmasked on PCB. |
| PGND (15,16) | Power ground return | Low-side MOSFET source return; tie directly to AGND and EP with wide copper pour to minimize EMI. |
| EP (17) | Exposed thermal pad | Must be soldered to inner-layer ground plane; accounts for >80% of total heat dissipation in 3 A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RESET with glitch filter | 25 µs filter window prevents false triggers during load transients; 2–4 ms delay ensures stable VOUT before system release. |
| BIAS-connected topology | Reduces no-load IQ to 24 µA by powering internal regulators from VOUT instead of VIN - critical for always-on modules. |
| Valley current limiting | 3.0–4.3 A programmable limit protects against sustained overloads and short circuits without external sense resistors. |
| Thermally optimized HTSSOP | RθJA = 42.5°C/W on 4-layer JEDEC board - enables 3 A operation at 85°C ambient with minimal heatsinking. |
| Automotive qualification | AEC-Q100 Grade 1 (-40°C to +125°C ambient), HBM ±2500 V (EN/RESET/FB), CDM ±750 V - validated for safety-critical domains. |
Applications
| Instrument Cluster Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Supplies 3.3 V to MCU, TFT display controller, and CAN transceiver in digital instrument clusters exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator with integrated RESET for system power sequencing and brownout detection. Use Value: Eliminates discrete supervisor IC and reduces BOM count by 2 components while meeting ASIL-B diagnostic coverage requirements via filtered RESET. |
Use Scenario: Powers image sensor, ISP, and gigabit Ethernet PHY in forward-facing ADAS cameras mounted behind windshield. IC Role / Device Role / Timing Role: High-efficiency 3.3 V step-down converter with FPWM mode to suppress EMI in high-speed serial links (e.g., MIPI CSI-2). Use Value: 2.1 MHz switching avoids interference with radar bands (76–81 GHz) and enables compact 1210-size inductors for space-constrained camera housings. |
| Infotainment Head Unit Core Rail | HUD Projection Driver Supply |
Use Scenario: Delivers clean 3.3 V to application processor, audio codec, and Wi-Fi/BT SoC in center-stack infotainment units. IC Role / Device Role / Timing Role: Main DC/DC converter with automatic PFM/PWM transition to maintain >85% efficiency from 10 µA to 3 A load. Use Value: 24 µA no-load current extends battery runtime in accessory-off state; ±2% accuracy ensures reliable DDR memory interface timing margins. |
Use Scenario: Provides regulated 3.3 V to DLP or LCoS microdisplay driver ICs and laser diode modulation circuitry in automotive head-up displays. IC Role / Device Role / Timing Role: Low-noise power stage with minimized output ripple (<15 mVpp) to prevent visible artifacts in projected imagery. Use Value: Integrated soft-start (1–3 ms) prevents optical flicker during ignition; BIAS connection reduces output impedance for dynamic load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53602QPWPRQ1 | 2 A max output current; identical pinout, features, and package - lower valley current limit (2.0–2.8 A) and reduced thermal margin at 3 A loads. | Suitable for lower-power instrument clusters or body control modules where peak load <2 A. | Select only if full 3 A capability is unnecessary; verify thermal design with RθJA = 42.5°C/W and 2 A derating curve. |
| MPQ4333GQ-AEC1 | Monolithic 3 A buck with 2.2 MHz switching; requires external feedback resistors for 3.3 V; no integrated RESET output. | Used where system-level supervision is handled by MCU or separate PMIC; lacks built-in power-good signaling. | Choose when footprint compatibility is secondary to cost optimization and RESET functionality is implemented elsewhere. |
Compared with LM53602QPWPRQ1 and MPQ4333GQ-AEC1, LM536033QPWPRQ1 uniquely combines 3 A capability, pin-compatible 3.3 V fixed output, integrated glitch-filtered RESET, and BIAS-connected efficiency - making it optimal for space- and reliability-constrained automotive subsystems requiring autonomous power monitoring.
Availability
LM536033QPWPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, infotainment head units, and HUD projection systems requiring stable component supply with AEC-Q100 compliance and long-term production continuity.
Supply support for LM536033QPWPRQ1 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-grade power management ICs, with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The LM5360x-Q1 product line was designed specifically for automotive power conversion - emphasizing wide-input operation, AEC-Q100 reliability, integrated diagnostics (RESET), and thermal robustness for under-hood and cabin-mounted ECUs.
FAQ
What is the minimum input voltage required for LM536033QPWPRQ1 to regulate a stable 3.3 V output?
The LM536033QPWPRQ1 requires a minimum input voltage of 3.9 V to maintain ±2% regulation at 3 A output current, per the System Characteristics table. At lighter loads (1 A), it can regulate down to 3.55 V input. This 3.5 V to 36 V operating range supports cold-crank conditions common in 12 V automotive systems.
Does LM536033QPWPRQ1 require external feedback resistors to set the 3.3 V output?
No, LM536033QPWPRQ1 does not require external feedback resistors for 3.3 V output. It features an internally trimmed resistor divider connected to the FB pin, enabling fixed 3.3 V operation out-of-the-box - reducing component count, layout area, and potential accuracy errors from external resistor tolerances.
How does the RESET function of LM536033QPWPRQ1 differ from a standard power-good signal?
The LM536033QPWPRQ1 RESET output includes a 12–45 µs glitch filter and 2–4 ms assertion delay, preventing false triggers during transient events. Its thresholds track the output voltage (e.g., 94.5%–96.5% falling, 105%–110% rising), offering tighter accuracy than discrete supervisors - eliminating need for external monitoring ICs in ASIL-B designs.
Can LM536033QPWPRQ1 operate in forced PWM mode, and how is it enabled?
Yes, LM536033QPWPRQ1 supports forced PWM (FPWM) mode to maintain constant 2.1 MHz switching regardless of load. This is enabled by driving the FPWM pin high (>1.5 V); when low (<0.4 V), the device automatically transitions between PWM and PFM for optimal light-load efficiency - critical for reducing audible noise in cabin systems.
What thermal considerations apply to LM536033QPWPRQ1 in a 3 A automotive application?
At 3 A output and 13.5 V input, LM536033QPWPRQ1 dissipates ~1.2 W. With its HTSSOP package and exposed thermal pad (EP), proper PCB layout - including soldering EP to a 4-layer internal ground plane - achieves RθJA ≈ 42.5°C/W. This allows operation up to 85°C ambient without derating, verified per JESD 51-7 thermal testing standards.
LM536033QPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- 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:
- 3A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM536033QPWPRQ1 FAQ
1.How can I place an order for LM536033QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM536033QPWPRQ1 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 LM536033QPWPRQ1 reliable?
The price and inventory of LM536033QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM536033QPWPRQ1 is usually 5 days.
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LM536033QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM536033QPWPRQ1 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 LM536033QPWPRQ1?
For technical support, including LM536033QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM536033QPWPRQ1 requirements.
6.How does Aetrix verify that LM536033QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM536033QPWPRQ1 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 LM536033QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM536033QPWPRQ1?
All LM536033QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM536033QPWPRQ1, 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 LM536033QPWPRQ1 part is unused and in its original packaging.
Return procedure for LM536033QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM536033QPWPRQ1 Tags
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