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Texas Instruments LM43600AQPWPTQ1
- Part No.:
- LM43600AQPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43600AQPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 500MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:488
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Product details
Overview
LM43600AQPWPTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC-DC converter delivering up to 0.5 A at output voltages from 1 V to 28 V, with input voltage range 3.5 V to 36 V (42 V transient), 33 µA quiescent current in regulation, and internal compensation enabling stable operation with ceramic, polymer, tantalum, or aluminum capacitors - deployed in sub-AM band automotive power rails.
For engineers reviewing the LM43600AQPWPTQ1 datasheet, LM43600AQPWPTQ1 pinout, LM43600AQPWPTQ1 application, or LM43600AQPWPTQ1 equivalent, key selection considerations include its PFM-optimized light-load efficiency, precision enable threshold (2.0–2.42 V), EN-controlled UVLO programming, 500 kHz default switching frequency (adjustable 200 kHz–2.2 MHz), and integrated power-good flag with 6% hysteresis.
Technical Context
The LM43600AQPWPTQ1 uses peak current mode control with automatic transition between continuous conduction mode (CCM), discontinuous conduction mode (DCM), and pulse frequency modulation (PFM) to maintain high efficiency across 0–0.5 A load range. Its internal compensation eliminates external loop components while supporting wide capacitor types.
It integrates high-side (419 mΩ) and low-side (231 mΩ) MOSFETs, features a dedicated BIAS pin for efficiency optimization (tied to VOUT or external 3.3/5 V rail), and provides synchronization capability via SYNC pin compatible with 200 kHz–2.2 MHz external clocks - all within a thermally enhanced HTSSOP-16 package with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V (42 V transient tolerant) - supports wide automotive battery and industrial supply variations without external protection. |
| Output Current | 0.5 A continuous - sufficient for microcontroller cores, sensors, and CAN transceivers in safety-critical subsystems. |
| Quiescent Current | 33 µA in regulation - enables always-on functionality in vehicle body electronics with minimal battery drain. |
| Switching Frequency | Default 500 kHz (200 kHz–2.2 MHz adjustable via RT pin) - balances EMI, inductor size, and efficiency for compact PCB layouts. |
| Feedback Reference | 1.009–1.023 V (±1.2% over –40°C to +125°C) - ensures tight output regulation across automotive temperature extremes. |
| Power-Good Flag | Open-drain PGOOD with 110%/83% trip thresholds and 6% hysteresis - provides reliable system sequencing and fault detection. |
| Thermal Protection | 160°C shutdown / 150°C recovery - safeguards against sustained overload or poor heatsinking in enclosed modules. |
Pinout & Package
The LM43600AQPWPTQ1 is housed in a 16-pin HTSSOP (PWP) package measuring 6.6 mm × 5.1 mm × 1.2 mm with 0.65-mm lead pitch and exposed thermal pad (PAD) connected internally to AGND for PCB-level 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 connection | Supplies gate drive for high-side MOSFET; requires 470-nF ceramic capacitor between CBOOT and SW for reliable operation. |
| VCC (4) | Internal LDO output | Bypassed to AGND; powers internal circuitry - no external load permitted; shorting to ground causes malfunction. |
| BIAS (5) | Optional LDO input | Improves efficiency when tied to VOUT (3.3–28 V) or external 3.3/5 V rail; bypass capacitor (1–10 µF) required if used. |
| SYNC (6) | External clock input | Enables synchronization to 200 kHz–2.2 MHz master clock; must be terminated properly to prevent ringing; tie to AGND if unused. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open circuit defaults to 500 kHz - enables EMI tuning and noise avoidance. |
| PGOOD (8) | Power-good flag | Open-drain output with 40–125 Ω pulldown; requires external pullup (10–100 kΩ) to logic rail ≤12 V for system sequencing. |
| FB (9) | Feedback sense | Monitors output voltage divider midpoint; 1.016 V nominal reference - determines VOUT = 1.016 × (1 + RFBT/RFBB). |
| AGND (10) | Analog ground | Reference for FB, SS/TRK, EN, PGOOD, and internal references - must connect to clean system ground plane, separate from PGND if possible. |
| SS/TRK (11) | Soft-start / tracking | Controls startup slew rate (4.1 ms internal); capacitor extends soft-start time; external ramp enables output voltage tracking. |
| EN (12) | Enable input | Logic-level control: >2.1 V enables, <2.0 V disables; hysteresis prevents chatter; supports precision UVLO programming. |
| VIN (13,14) | Main input supply | Connects to input capacitor (CIN); dual pins reduce IR drop and improve thermal performance - shortest possible path to PGND required. |
| PGND (15,16) | Power ground | Low-side FET source return; connects to CIN/COUT grounds and thermal pad - forms primary high-current return path. |
| PAD | Thermal pad | Internally connected to AGND; must be soldered to large PCB copper area 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 engine bay, ADAS, and infotainment power supplies. |
| Light-load efficiency | DCM and PFM modes reduce switching losses below ~100 mA - critical for always-on telematics and gateway modules. |
| EMI compliance | Tested to EN55022/CISPR 22 Class B radiated/conducted emissions - reduces need for external filtering in cost-sensitive designs. |
| Pre-biased soft-start | Safe startup into pre-charged output capacitors - prevents reverse current flow and protects downstream loads during hot-swap events. |
| Short-circuit protection | Hiccup-mode current limiting (32-cycle wait, 5.5 ms retry) - sustains fault condition without thermal runaway or latch-up. |
| Flexible enable control | Precision EN threshold (2.0–2.42 V) with 305 mV hysteresis - enables direct connection to MCU GPIO or resistor-divider UVLO networks. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codec in automotive head units with variable battery input (9–16 V) and strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3 V/5 V point-of-load regulator with PGOOD signaling for system boot sequencing and brownout detection. Use Value: 33 µA quiescent current minimizes standby drain; EN hysteresis prevents false resets during cranking; EN55022 compliance avoids costly shielding. |
Use Scenario: Supplies image sensor, ISP, and MIPI transmitter in rear-view or surround-view cameras mounted near engine compartments. IC Role / Device Role / Timing Role: High-reliability 1.8 V/2.8 V regulator with thermal shutdown and hiccup-mode fault handling under vibration and temperature cycling. Use Value: AEC-Q100 Grade 1 rating ensures operation at +125°C ambient; PFM mode maintains >85% efficiency at 10 mA idle current. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Regulates power for door lock actuators, window motors, and LED lighting drivers in centralized BCMs with shared 12 V bus. IC Role / Device Role / Timing Role: Secondary buck converter stepping down from main 12 V rail to 5 V for microcontroller peripherals and CAN transceivers. Use Value: Wide 3.5–36 V input accommodates load-dump transients; SYNC pin allows clock alignment with main system controller to reduce beat frequencies. |
Use Scenario: Provides stable 3.3 V for LTE modem, GNSS receiver, and secure element in always-connected vehicle-to-cloud gateways. IC Role / Device Role / Timing Role: Always-on regulator with programmable soft-start (via SS/TRK capacitor) and tracking for controlled power-up of multi-rail subsystems. Use Value: Internal soft-start (4.1 ms) prevents inrush current on cold start; BIAS pin tied to VOUT improves efficiency by >5% at full load. |
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 |
|---|---|---|---|
| LM43601QPWPTQ1 | 1 A output current, identical pinout and feature set - higher current capability with same footprint and thermal profile. | Suitable where future-proofing for higher load or parallel operation is required; shares same PCB layout but requires larger inductor/capacitor ratings. | Select when >0.5 A peak load is anticipated or when design reuse across 0.5 A/1 A variants simplifies BOM management. |
| TPS543320RHLT | 3 A output, 2.2 V to 18 V input, integrated FETs, and PMBus interface - higher integration but narrower VIN range and different package (14-pin QFN). | Targeted at high-density server or industrial PoL applications requiring digital monitoring; lacks AEC-Q100 qualification and automotive temp range. | Choose only for non-automotive systems needing telemetry or tighter output tolerance; not a drop-in replacement due to pinout and qualification mismatch. |
Compared with LM43600AQPWPTQ1, LM43601QPWPTQ1 offers scalable current capacity without layout change, while TPS543320RHLT trades automotive qualification for digital control and higher current - making LM43600AQPWPTQ1 optimal for cost-sensitive, thermally constrained automotive subsystems requiring guaranteed Grade 1 reliability.
Availability
LM43600AQPWPTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control units requiring stable component supply with AEC-Q100 traceability and long-term production support.
Supply support for LM43600AQPWPTQ1 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 power management ICs, with deep expertise in automotive-grade reliability and functional safety.
The LM43600-Q1 family was designed specifically for automotive power conversion - emphasizing low quiescent current, wide input range, EMI robustness, and AEC-Q100 qualification to meet stringent vehicle subsystem requirements.
FAQ
What is the maximum input voltage transient rating for LM43600AQPWPTQ1?
The LM43600AQPWPTQ1 supports 42 V transient input voltage per absolute maximum ratings, enabling robust operation during automotive load-dump events without external TVS clamping in many configurations. This rating applies to VIN-to-PGND stress and is validated per ISO 7637-2 Pulse 5a test conditions. The device remains functional after transient exposure as long as junction temperature stays within limits and external components (e.g., input capacitor voltage rating) are appropriately selected for the application.
Does LM43600AQPWPTQ1 support output voltage tracking during power-up?
Yes, LM43600AQPWPTQ1 supports output voltage tracking via the SS/TRK pin: applying an external voltage ramp to this pin forces the FB node to follow that ramp, enabling coordinated startup with other regulators in multi-rail systems. This function is explicitly documented in the datasheet's "Feature Description" section and verified in typical application circuits. Tracking accuracy depends on external ramp generator stability and PCB layout integrity, not internal calibration.
How does the BIAS pin improve efficiency in LM43600AQPWPTQ1?
The BIAS pin in LM43600AQPWPTQ1 reduces power loss by supplying the internal high-side gate driver from VOUT (when 3.3 V ≤ VOUT ≤ 28 V) instead of the less efficient VCC LDO. When configured this way, measured efficiency improves by up to 5% at full load compared to BIAS grounded. The datasheet specifies mandatory 1–10 µF bypass capacitance on BIAS when used, and prohibits floating the pin - confirming its role as a dedicated efficiency-optimization path, not a general-purpose supply input.
What is the purpose of the PAD terminal in LM43600AQPWPTQ1's HTSSOP package?
The PAD terminal in LM43600AQPWPTQ1 is an exposed thermal pad electrically connected to AGND, serving as the primary heat dissipation path from the die to the PCB. It must be soldered to a large copper pour tied to system ground - not left floating or isolated. Thermal testing shows RθJB = 21.7 °C/W with proper pad connection, directly impacting maximum sustainable output current at high ambient temperatures. Its grounding also contributes to EMI suppression by providing low-impedance return for high-frequency currents.
Can LM43600AQPWPTQ1 operate without an external RT resistor?
Yes, LM43600AQPWPTQ1 operates at its default 500 kHz switching frequency when the RT pin is left unconnected (open circuit), as confirmed in Section 6.7 of the datasheet. This configuration is production-validated and commonly used in reference designs like the LM43600QPWPEVM. Adding an RT resistor enables precise frequency adjustment between 200 kHz and 2.2 MHz, but omission introduces no functional risk - only loss of tunability for EMI or efficiency optimization.
LM43600AQPWPTQ1 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:
- 500mA
- 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
LM43600AQPWPTQ1 FAQ
1.How can I place an order for LM43600AQPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43600AQPWPTQ1 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 LM43600AQPWPTQ1 reliable?
The price and inventory of LM43600AQPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43600AQPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM43600AQPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43600AQPWPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43600AQPWPTQ1?
LM43600AQPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43600AQPWPTQ1 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 LM43600AQPWPTQ1?
For technical support, including LM43600AQPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43600AQPWPTQ1 requirements.
6.How does Aetrix verify that LM43600AQPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM43600AQPWPTQ1 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 LM43600AQPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM43600AQPWPTQ1?
All LM43600AQPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43600AQPWPTQ1, 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 LM43600AQPWPTQ1 part is unused and in its original packaging.
Return procedure for LM43600AQPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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