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Texas Instruments LM43601AQPWPRQ1
- Part No.:
- LM43601AQPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43601AQPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,450
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Product details
Overview
LM43601AQPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC-DC converter delivering up to 1 A output current across 3.5 V to 36 V input, with 33 µA quiescent current in regulation, adjustable 200 kHz–2.2 MHz switching frequency, and integrated power-good flag. It enables compact, high-efficiency point-of-load regulation in engine control units and ADAS domain controllers.
For engineers reviewing the LM43601AQPWPRQ1 datasheet, LM43601AQPWPRQ1 pinout, LM43601AQPWPRQ1 application, or LM43601AQPWPRQ1 equivalent, key selection considerations include its PFM/DCM light-load efficiency mode, precision enable threshold (2.1 V ±305 mV), internal soft-start (4.1 ms), and EN55022 Class B radiated emissions compliance without external filters.
Technical Context
The LM43601AQPWPRQ1 employs fixed-frequency peak current mode control with automatic transition into discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) at light loads. Its internal compensation eliminates external loop components, while the RT pin allows resistor-based frequency programming from 200 kHz to 2.2 MHz - defaulting to 500 kHz when open.
It integrates both high-side (419 mΩ typical RDS(on)) and low-side (231 mΩ typical RDS(on)) NMOS power switches, supports synchronization to external clocks (200 kHz–2.2 MHz), and features precision enable with 2.1 V rising threshold and 305 mV hysteresis for system-level UVLO sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide automotive battery transients up to 42 V, enabling direct connection to 12 V/24 V vehicle systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in safety-critical ECUs. |
| Quiescent Current | 33 µA in regulation - minimizes standby power loss in always-on automotive modules such as body control units. |
| Switching Frequency | 200 kHz to 2.2 MHz (adjustable via RT pin) - allows optimization for EMI reduction (lower f) or small magnetics (higher f). |
| Feedback Reference | 1.016 V ±10 mV (–40°C to +125°C) - ensures stable 1% output voltage accuracy across full automotive temperature range. |
| Enable Threshold | 2.1 V ±305 mV rising edge - enables precise system-level undervoltage lockout (UVLO) with built-in hysteresis for reliable power sequencing. |
| Thermal Shutdown | 160°C shutdown / 150°C recovery - protects against sustained overload or poor PCB thermal design in enclosed automotive enclosures. |
Pinout & Package
LM43601AQPWPRQ1 is housed in a thermally enhanced 16-pin HTSSOP (PWP) package measuring 6.6 mm × 5.1 mm × 1.2 mm with 0.65 mm lead pitch. The exposed thermal pad (PAD) must be soldered to a PCB ground plane for effective heat dissipation and meets AEC-Q100 Grade 1 requirements (–40°C to +125°C ambient).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high di/dt switching current - requires short, low-inductance layout to minimize EMI and voltage spikes. |
| CBOOT (3) | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; requires 470 nF ceramic capacitor between CBOOT and SW for reliable operation. |
| VCC (4) | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; no external load permitted - powers internal circuitry only. |
| BIAS (5) | Optional LDO input | Tie to VOUT (if ≥3.3 V) or external 3.3/5 V rail to reduce power loss; tie to PGND if unused - improves light-load efficiency. |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; requires proper high-speed termination to prevent ringing - enables synchronized multi-rail systems. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open circuit = 500 kHz default - enables EMI tuning and magnetics optimization. |
| PGOOD (8) | Open-drain power-good flag | Signals valid output after soft-start and regulation; requires 10–100 kΩ pull-up to ≤12 V logic rail - used for system power sequencing. |
| FB (9) | Feedback sense input | Monitors resistive divider midpoint; 1.016 V reference sets VOUT = 1.016 × (1 + RFBT/RFBB) - enables precise output voltage configuration. |
| AGND (10) | Analog ground reference | Reference for FB, SS/TRK, EN, PGOOD; must connect directly to system ground plane - separates noise-sensitive analog circuitry from power ground. |
| SS/TRK (11) | Soft-start/track control | Capacitor extends soft-start time; external ramp enables output voltage tracking - prevents inrush current and supports multi-rail sequencing. |
| EN (12) | Enable input | Active-high logic; 2.1 V threshold enables regulator - supports precision UVLO and controlled power-up of downstream ICs. |
| VIN (13,14) | Main input supply | Connects to bulk input capacitor (CIN) and high-frequency bypass - dual pins reduce IR drop and improve transient response. |
| PGND (15,16) | Power ground return | Low-impedance return path for high-side/low-side FETs and input/output capacitors - must tie to AGND and thermal pad for optimal performance. |
| PAD | Exposed thermal pad | Internally connected to AGND; primary heat dissipation path - must be soldered to large copper area on PCB for thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction losses and improves full-load efficiency by >5% vs. asynchronous designs. |
| Internal compensation | Removes need for external Type II/III compensation network - simplifies design, reduces BOM count, and accelerates time-to-market. |
| Stable with diverse output capacitors | Supports ceramic, polymer, tantalum, and aluminum electrolytic capacitors - increases flexibility in cost, size, and reliability trade-offs. |
| Soft-start into pre-biased load | Prevents reverse current flow during startup when output is already biased - essential for hot-swap and redundant power applications. |
| EMI-tested to EN55022 Class B | Meets automotive radiated emission limits without input filter on evaluation board - reduces need for costly shielding or ferrites. |
| Hiccup-mode short-circuit protection | Enters safe low-duty-cycle retry mode during output short - prevents thermal runaway and enables automatic recovery without system reset. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module Regulation |
|---|---|
|
Use Scenario: Powers 32-bit MCU, CAN transceiver, and analog front-end in gasoline/diesel engine control units operating across cold-crank (4.5 V) to load-dump (42 V) conditions. IC Role / Device Role / Timing Role: Primary 5 V or 3.3 V point-of-load regulator with precision enable sequencing and hiccup-mode fault protection. Use Value: 33 µA quiescent current extends battery life during vehicle sleep mode; EN55022 Class B compliance avoids EMI rework in crowded under-hood layouts. |
Use Scenario: Supplies image sensor, ISP, and serializer in 77 GHz radar or surround-view camera modules requiring low-noise, stable 1.8 V/3.3 V rails. IC Role / Device Role / Timing Role: Synchronous buck converter with internal soft-start and output voltage tracking for clean power-up of multi-rail imaging subsystems. Use Value: Adjustable 200 kHz–2.2 MHz switching frequency enables EMI spread-spectrum tuning to avoid interference with RF bands; PFM mode maintains >85% efficiency at 10 mA load. |
| Automotive Infotainment Head Unit | Telematics Control Unit (TCU) |
|
Use Scenario: Generates 1.1 V core voltage for application processor and 3.3 V I/O rail in infotainment head units with display, audio, and connectivity interfaces. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC converter supporting wide VIN range and fast load transients from display backlight switching. Use Value: 1 A output current and 419/231 mΩ MOSFET RDS(on) ensure <100 mV dropout at full load; HTSSOP thermal pad enables operation at 125°C ambient without derating. |
Use Scenario: Provides regulated 5 V and 3.3 V supplies for LTE modem, GNSS receiver, and secure boot controller in cellular-connected vehicle telematics units. IC Role / Device Role / Timing Role: Automotive-grade synchronous buck with power-good flag and precision enable for secure boot sequencing and firmware update power management. Use Value: PGOOD signal validates output before releasing processor reset; 2.1 V enable threshold enables coordinated wake-up with vehicle CAN bus activity detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43600QPWPRQ1 | 0.5 A output current; identical pinout and feature set except reduced current capability and higher RDS(on) (HS: 650 mΩ, LS: 350 mΩ). | Suitable for lower-power domains like instrument cluster MCUs or LIN transceivers where 1 A is excessive. | Select when system load is ≤500 mA and thermal budget is constrained - same layout reuse possible but verify inductor saturation current. |
| LM43602QPWPRQ1 | 2 A output current; identical pinout, package, and feature set with lower RDS(on) (HS: 220 mΩ, LS: 120 mΩ) and higher thermal limits. | Required for high-current applications such as ADAS domain controllers or multi-core SoCs with dynamic power bursts. | Choose when peak load exceeds 1 A or junction temperature margin is marginal - drop-in replacement with no layout change needed. |
Compared with LM43600QPWPRQ1 and LM43602QPWPRQ1, the LM43601AQPWPRQ1 delivers optimal balance of current capability, thermal performance, and solution size for mid-tier automotive ECUs - avoiding overdesign cost while ensuring headroom for transient loads.
Availability
LM43601AQPWPRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, infotainment head units, and telematics control units requiring stable component supply with AEC-Q100 qualification and long-term production support.
Supply support for LM43601AQPWPRQ1 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 solutions with decades of automotive qualification expertise.
The LM43601-Q1 family was designed specifically for automotive power conversion - emphasizing AEC-Q100 reliability, wide-input operation, low quiescent current, and EMI robustness in harsh vehicular environments.
FAQ
What is the maximum input voltage rating for LM43601AQPWPRQ1?
The LM43601AQPWPRQ1 has an absolute maximum input voltage rating of 42 V, with recommended operating range from 3.5 V to 36 V. This withstands automotive load-dump transients per ISO 7637-2 while maintaining regulation down to cold-crank conditions (~4.5 V). Exceeding 42 V risks permanent damage per the Absolute Maximum Ratings table.
Does LM43601AQPWPRQ1 support output voltage tracking?
Yes, LM43601AQPWPRQ1 supports output voltage tracking via the SS/TRK pin. Connecting this pin to an external voltage ramp (e.g., from another regulator's soft-start node) forces the LM43601AQPWPRQ1 output to follow that ramp, enabling precise power sequencing in multi-rail systems such as processors with core/I/O voltage dependencies.
How does the BIAS pin improve efficiency in LM43601AQPWPRQ1?
The BIAS pin in LM43601AQPWPRQ1 accepts an external 3.3 V or 5 V supply (or ties to VOUT ≥3.3 V) to power the internal LDO, reducing power loss from VIN-to-VCC conversion. When enabled, it cuts quiescent current from VIN by ~85 µA and improves light-load efficiency - especially valuable in always-on automotive modules.
What is the purpose of the PGOOD pin on LM43601AQPWPRQ1?
The PGOOD pin on LM43601AQPWPRQ1 is an open-drain output that asserts high (when pulled up) once output voltage reaches 90% of target and remains within ±13% tolerance. It provides system-level power-good signaling for processor reset release, FPGA configuration enable, or inter-rail sequencing - critical for deterministic boot behavior in automotive ECUs.
Can LM43601AQPWPRQ1 synchronize to an external clock?
Yes, LM43601AQPWPRQ1 supports external clock synchronization via the SYNC pin, accepting square-wave inputs from 200 kHz to 2.2 MHz. This enables noise-sensitive systems (e.g., radar, audio) to align switching edges and avoid beat frequencies - requiring proper high-speed termination to prevent signal integrity issues.
LM43601AQPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM43601AQPWPRQ1 FAQ
1.How can I place an order for LM43601AQPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43601AQPWPRQ1 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 LM43601AQPWPRQ1 reliable?
The price and inventory of LM43601AQPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43601AQPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM43601AQPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43601AQPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43601AQPWPRQ1?
LM43601AQPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43601AQPWPRQ1 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 LM43601AQPWPRQ1?
For technical support, including LM43601AQPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43601AQPWPRQ1 requirements.
6.How does Aetrix verify that LM43601AQPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM43601AQPWPRQ1 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 LM43601AQPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM43601AQPWPRQ1?
All LM43601AQPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43601AQPWPRQ1, 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 LM43601AQPWPRQ1 part is unused and in its original packaging.
Return procedure for LM43601AQPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM43601AQPWPRQ1 Tags
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