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Texas Instruments LM43601AQPWPTQ1
- Part No.:
- LM43601AQPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43601AQPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:236
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Product details
Overview
LM43601AQPWPTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC-DC converter delivering up to 1 A output current from a 3.5 V–36 V input, featuring 33 µA quiescent current in regulation, adjustable 200 kHz–2.2 MHz switching frequency (500 kHz default), and integrated power-good flag. It operates in PFM/DCM at light loads for high efficiency and supports soft-start into pre-biased outputs-ideal for sub-AM band automotive power rails.
For engineers reviewing the LM43601AQPWPTQ1 datasheet, LM43601AQPWPTQ1 pinout, LM43601AQPWPTQ1 application, or LM43601AQPWPTQ1 equivalent, key selection considerations include its automotive-grade thermal performance (–40°C to +125°C ambient), precision enable threshold (2.1 V typical), internal compensation, and EN55022 Class B EMI compliance without external filters.
Technical Context
The LM43601AQPWPTQ1 employs fixed-frequency peak current mode control with automatic transition to discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) at light loads-enabling >90% efficiency down to 1 mA load. Its internal compensation eliminates external loop components, while the RT pin allows resistor-based frequency programming across 200 kHz–2.2 MHz.
It integrates both high-side (419 mΩ typical RDS(on)) and low-side (231 mΩ typical RDS(on)) MOSFETs, supports synchronization to external clocks, and features precision enable with 2.1 V rising threshold and 305 mV hysteresis-critical for controlled system power sequencing in automotive infotainment and ADAS subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide automotive battery transients (42 V max); enables direct connection to 12 V/24 V systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in automotive body electronics. |
| Quiescent Current | 33 µA in regulation - extends battery life in always-on modules (e.g., telematics, gateway ECUs). |
| Switching Frequency | 200 kHz–2.2 MHz (adjustable via RT pin; 500 kHz default) - balances PCB size (high-freq) vs. efficiency (low-freq) per design constraints. |
| Feedback Reference Voltage | 1.016 V (±1.4% over –40°C to +125°C) - enables accurate output regulation across temperature for safety-critical loads. |
| Power-Good Flag | Open-drain PGOOD with 113% OV / 90% UV thresholds - provides reliable system-level power monitoring with built-in hysteresis. |
| Thermal Shutdown | 160°C shutdown / 150°C recovery - protects against sustained overload or poor heatsinking in enclosed automotive enclosures. |
Pinout & Package
LM43601AQPWPTQ1 is housed in a thermally enhanced 16-pin HTSSOP (PWP) package (6.6 mm × 5.1 mm × 1.2 mm, 0.65 mm pitch), with exposed thermal pad (PAD) connected internally to AGND for optimal PCB heat dissipation.
| 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 | Bypassed to AGND with 1–10 µF capacitor; powers internal circuitry-no external load permitted. |
| BIAS (5) | Optional LDO input | Tie to VOUT (if ≥3.3 V) or external 3.3/5 V rail to reduce VIN supply current and improve light-load efficiency. |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; enables synchronized multi-rail systems and EMI reduction via frequency dithering. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open-circuit = 500 kHz default; 1% tolerance resistors recommended. |
| PGOOD (8) | Power-good flag | Open-drain output; requires 10–100 kΩ pull-up to logic rail ≤12 V; asserts after soft-start and VOUT regulation. |
| FB (9) | Feedback sense | Monitors output via resistor divider; 1.016 V reference enables precise VOUT setting (e.g., 3.3 V, 5 V, 12 V). |
| AGND (10) | Analog ground | Reference for FB, SS/TRK, EN, PGOOD; must be star-connected to PGND near device to avoid noise coupling. |
| SS/TRK (11) | Soft-start / tracking | Capacitor to AGND extends soft-start time; external ramp enables output voltage tracking during power sequencing. |
| EN (12) | Enable input | Logic-compatible; 2.1 V rising threshold enables precise UVLO programming for system-level brownout protection. |
| VIN (13, 14) | Main input supply | High-current path for internal LDO and high-side FET; requires low-ESR input capacitors placed close to pins. |
| PGND (15, 16) | Power ground | Low-side FET source return; connects to CIN/COUT grounds and thermal pad-must be low-impedance copper pour. |
| PAD | Thermal pad | Internally tied to AGND; mandatory solder connection to PCB ground plane for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) - certified for under-hood and cabin applications without derating. |
| Integrated synchronous FETs | 419 mΩ HS / 231 mΩ LS RDS(on) - eliminates external rectifier, reduces conduction loss, and improves full-load efficiency by ~3% vs. diode-based solutions. |
| EMI-compliant design | Meets EN55022 Class B radiated/conducted emissions without input filter - reduces BOM cost and board area in ECU designs. |
| Pre-biased soft-start | Supports startup into pre-charged output - prevents reverse current flow in multi-rail systems with staggered power-up sequences. |
| Internal compensation | No external compensation network required - accelerates design cycle and eliminates tuning iterations for stable loop response. |
| Hiccup-mode short-circuit protection | Auto-retry after 5.5 ms delay upon LS current limit trip - limits fault energy and enables self-recovery without system reset. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers SoC, display controller, and audio codec in automotive head units with variable battery voltage (9–16 V) and strict EMI limits. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, regulated 3.3 V/5 V rails with PGOOD signaling for system boot coordination. Use Value: 33 µA quiescent current extends standby time; EN55022 Class B compliance avoids costly shielding; PFM mode maintains >85% efficiency at 10 mA load. |
Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view camera modules mounted near hot engine compartments. IC Role / Device Role / Timing Role: High-reliability point-of-load converter delivering 1.2 V/1.8 V/3.3 V with thermal shutdown at 160°C and automotive-grade lifetime. Use Value: AEC-Q100 Grade 1 rating ensures operation at +125°C ambient; internal soft-start prevents inrush damage to sensitive CMOS sensors. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) |
|
Use Scenario: Regulates power for LTE modem, GNSS receiver, and CAN transceivers in always-connected vehicle gateways with battery backup. IC Role / Device Role / Timing Role: Dual-role regulator supporting both main 12 V input and backup 3.3 V rail via BIAS pin configuration. Use Value: Precision enable (2.1 V threshold) enables seamless switchover between primary and backup sources; hiccup protection sustains operation during CAN bus short events. |
Use Scenario: Powers microcontroller, LIN transceivers, and LED drivers in door modules, seat controllers, and lighting nodes. IC Role / Device Role / Timing Role: Compact, low-noise buck converter enabling space-constrained PCB layouts in plastic housings with limited airflow. Use Value: HTSSOP package with thermal pad achieves <40°C/W θJA on 2-layer boards; tracking capability synchronizes multiple rails during wake-up sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43600QPWPTQ1 | 0.5 A output current; identical pinout and feature set except lower current rating and higher RDS(on) (HS: 620 mΩ, LS: 340 mΩ). | Suitable for lower-power MCU or sensor rails where 1 A headroom is unnecessary. | Select when load current remains ≤500 mA and thermal margin is constrained-reduces solution size and cost without redesign. |
| LM43602QPWPTQ1 | 2 A output current; same package, pinout, and control architecture; optimized for higher thermal dissipation (RθJA = 37.5°C/W). | Required for dual-core processors or multi-sensor clusters drawing >1.2 A peak current. | Choose for future-proofing or higher-current derivatives-no layout change needed due to pin-to-pin compatibility. |
Compared with LM43600QPWPTQ1 and LM43602QPWPTQ1, the LM43601AQPWPTQ1 delivers optimal balance of current capability, thermal performance, and footprint for mid-tier automotive ECUs-offering 1 A continuous output without overdesigning for 2 A or under-specifying for 0.5 A.
Availability
LM43601AQPWPTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, telematics control units, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM43601AQPWPTQ1 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.
The LM43601-Q1 family was designed specifically for automotive power conversion-emphasizing AEC-Q100 reliability, EN55022 EMI robustness, and simplified system integration in space- and thermal-constrained electronic control units.
FAQ
What is the maximum input voltage transient rating for LM43601AQPWPTQ1?
The LM43601AQPWPTQ1 supports 42 V absolute maximum input voltage transients, making it suitable for 12 V automotive systems experiencing load dump events per ISO 7637-2. This rating is validated across the full –40°C to +125°C operating range and does not require external clamping for standard vehicle battery profiles.
Does LM43601AQPWPTQ1 require external compensation components?
No, LM43601AQPWPTQ1 features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies layout, reduces BOM count, and guarantees stable operation across all supported output capacitors-including ceramic, polymer, tantalum, and aluminum electrolytic types-without loop tuning.
How does the BIAS pin improve efficiency in LM43601AQPWPTQ1 designs?
When the BIAS pin is tied to VOUT (≥3.3 V) or an external 3.3/5 V rail, LM43601AQPWPTQ1 bypasses its internal VIN-powered LDO, reducing quiescent current draw from VIN by up to 140 µA. This significantly improves light-load efficiency-especially critical in always-on automotive modules where standby current directly impacts battery drain.
Can LM43601AQPWPTQ1 synchronize to an external clock, and what are the timing requirements?
Yes, LM43601AQPWPTQ1 accepts external synchronization via the SYNC pin across 200 kHz–2.2 MHz. The clock must meet VHIGH ≥2 V, VLOW ≤0.4 V, duty cycle 10%–90%, and minimum pulse width ≥80 ns. Proper high-speed termination is required to prevent ringing that could cause erratic switching behavior.
What is the soft-start behavior of LM43601AQPWPTQ1 when driving a pre-biased output?
LM43601AQPWPTQ1 supports soft-start into pre-biased outputs without reverse current flow. Its internal control logic disables the high-side FET until the feedback voltage rises above the reference, allowing safe ramp-up even when the output capacitor is already charged-essential for hot-swap and multi-rail sequencing applications.
LM43601AQPWPTQ1 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
LM43601AQPWPTQ1 FAQ
1.How can I place an order for LM43601AQPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43601AQPWPTQ1 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 LM43601AQPWPTQ1 reliable?
The price and inventory of LM43601AQPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43601AQPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM43601AQPWPTQ1?
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4.How is shipping managed for LM43601AQPWPTQ1?
LM43601AQPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43601AQPWPTQ1 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 LM43601AQPWPTQ1?
For technical support, including LM43601AQPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43601AQPWPTQ1 requirements.
6.How does Aetrix verify that LM43601AQPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM43601AQPWPTQ1 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 LM43601AQPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM43601AQPWPTQ1?
All LM43601AQPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43601AQPWPTQ1, 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 LM43601AQPWPTQ1 part is unused and in its original packaging.
Return procedure for LM43601AQPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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