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Texas Instruments LM43600QPWPTQ1
- Part No.:
- LM43600QPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43600QPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 500MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LM43600QPWPTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC-DC converter delivering up to 0.5 A output current across a 3.5 V to 36 V input range, with 33 µA quiescent current in regulation, internal compensation, and 500 kHz default switching frequency. It integrates high-side and low-side MOSFETs (RDS(on) = 419 mΩ / 231 mΩ), supports soft-start into pre-biased loads, and provides power-good flag for automotive sub-AM band power rails.
For engineers reviewing the LM43600QPWPTQ1 datasheet, LM43600QPWPTQ1 pinout, LM43600QPWPTQ1 application, or LM43600QPWPTQ1 equivalent, key selection considerations include its 16-pin HTSSOP package with thermal pad, precision enable threshold (2.1 V typ), ±1.5% output voltage accuracy over temperature, EN55022 Class B radiated emissions compliance, and PFM/DCM light-load efficiency mode.
Technical Context
The LM43600QPWPTQ1 employs fixed-frequency peak current mode control with automatic transition to discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) at light loads to maintain high efficiency across the full 0–0.5 A load range. Its internal compensation eliminates external loop components while supporting stable operation with ceramic, polymer, tantalum, or aluminum output capacitors.
It features programmable switching frequency (200 kHz–2.2 MHz via RT pin), external clock synchronization capability, precision enable with 2.1 V rising threshold and 305 mV hysteresis, and integrated protection including cycle-by-cycle current limiting (1.33 A peak), hiccup-mode short-circuit response, and thermal shutdown at 160 °C.
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 | 0.5 A continuous - Sufficient for microcontroller cores, sensors, and CAN transceivers in automotive ECUs. |
| Quiescent Current | 33 µA in regulation - Enables always-on functionality in low-power automotive modules without excessive battery drain. |
| Switching Frequency | 500 kHz default (200 kHz–2.2 MHz adjustable) - Balances efficiency and size; higher frequencies allow smaller inductors and capacitors. |
| Feedback Accuracy | ±1.5% over –40°C to +125°C - Ensures precise output regulation across full automotive ambient temperature range. |
| Power-Good Flag | Open-drain PGOOD with 113% OV / 90% UV thresholds - Provides reliable system-level power sequencing and fault detection. |
| Thermal Shutdown | 160 °C trip, 150 °C recovery - Protects against sustained overload or poor PCB heat sinking in enclosed automotive environments. |
Pinout & Package
LM43600QPWPTQ1 is housed in a 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 and serving as primary heat dissipation path to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high di/dt switching current; requires minimal loop area to reduce EMI. |
| CBOOT (3) | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; requires 470 nF ceramic capacitor between CBOOT and SW. |
| VCC (4) | Internal LDO output | Bypassed to AGND; powers internal circuitry; must not be loaded externally or shorted to ground. |
| BIAS (5) | Optional LDO input | Improves efficiency when tied to VOUT (3.3–28 V) or external 3.3/5 V rail; bypass with 1–10 µF capacitor. |
| SYNC (6) | External clock input | Enables synchronization to system clock (200 kHz–2.2 MHz); requires proper high-speed termination. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open circuit defaults to 500 kHz. |
| PGOOD (8) | Power-good flag | Open-drain output; requires 10–100 kΩ pull-up; asserts after VOUT reaches 90% of target and remains stable. |
| FB (9) | Feedback sense | Monitors resistor divider midpoint; sets VOUT = 1.016 V × (1 + RFBT/RFBB); input leakage <65 nA. |
| AGND (10) | Analog ground reference | Ground for internal references and feedback circuitry; must connect to low-noise system ground point. |
| SS/TRK (11) | Soft-start/tracking control | Internal 4.1 ms soft-start when floating; external capacitor extends time; voltage ramp enables output tracking. |
| EN (12) | Enable input | Logic-compatible; 2.1 V threshold enables regulator; hysteresis prevents chatter near threshold. |
| VIN (13,14) | Main input supply | Connects to input capacitor (CIN) and high-side FET; dual pins reduce IR drop and improve thermal performance. |
| PGND (15,16) | Power ground return | Low-side FET source connection; must tie to AGND, PAD, and CIN/COUT grounds with shortest possible path. |
| PAD | Thermal pad / ground | Internally connected to AGND; mandatory for thermal management; solder to large PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) - Validated for under-hood and cabin ECU applications. |
| Integrated synchronous FETs | RDS(on) = 419 mΩ (HS) / 231 mΩ (LS) - Eliminates external rectifier losses and reduces solution footprint. |
| Light-load efficiency mode | Automatic DCM and PFM operation - Maintains >80% efficiency at 1 mA load, critical for always-on systems. |
| EMI compliance | Tested to EN55022/CISPR 22 Class B - Meets automotive radiated emission limits without external filters. |
| Pre-biased soft-start | Safe startup into existing VOUT - Prevents reverse current flow when powering up downstream circuits already biased. |
| Output voltage tracking | SS/TRK pin accepts external ramp - Enables coordinated power-up sequencing with other rails in multi-rail systems. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers SoC, image sensor, and ISP in automotive rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Primary 3.3 V or 5 V point-of-load regulator with fast transient response and low noise. Use Value: 33 µA quiescent current enables parking-mode operation; PFM mode maintains >85% efficiency at 10 mA load. |
Use Scenario: Supplies 12 V or 5 V rail for radar front-end ICs and RF amplifiers in forward collision warning systems. IC Role / Device Role / Timing Role: Wide-input buck converter handling cold-crank (3.5 V) and load-dump (36 V) conditions. Use Value: 42 V absolute max input rating and thermal shutdown protect against automotive transients and enclosure overheating. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
|
Use Scenario: Generates 5 V for microcontroller, CAN transceivers, and LIN interfaces in door modules or lighting controllers. IC Role / Device Role / Timing Role: Regulator with precision enable and PGOOD for safe power sequencing and fault reporting. Use Value: 2.1 V enable threshold allows direct connection to MCU GPIO; PGOOD enables firmware-controlled power validation. |
Use Scenario: Provides stable 3.3 V supply for cellular modem, GNSS receiver, and secure boot processor in vehicle connectivity units. IC Role / Device Role / Timing Role: EMI-compliant buck converter meeting CISPR 22 Class B for wireless coexistence. Use Value: Radiated emissions below limit line without input filter simplifies layout and reduces BOM cost in space-constrained TCU designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43601QPWPTQ1 | 1 A output current, identical pinout and feature set; higher RDS(on) (HS: 220 mΩ, LS: 120 mΩ). | Required where load exceeds 0.5 A but board space and thermal design support same footprint. | Select when future-proofing for higher current or margin expansion without layout change. |
| LM46002QPWPTQ1 | 2 A output, 16-pin HTSSOP, same VIN range and features; optimized for lower RDS(on) (HS: 110 mΩ, LS: 65 mΩ). | Suitable for multi-rail systems needing higher current on adjacent rails with shared thermal constraints. | Choose for new designs targeting >1 A loads where thermal headroom permits same package size. |
Compared with LM43600QPWPTQ1, LM43601QPWPTQ1 offers 100% higher current capacity in identical packaging-ideal for incremental upgrades-while LM46002QPWPTQ1 delivers double the current with significantly lower conduction losses, better suited for thermally demanding 2 A applications where efficiency and junction temperature are critical.
Availability
LM43600QPWPTQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control units requiring stable component supply with AEC-Q100 qualification and long-term production support.
Supply support for LM43600QPWPTQ1 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 and embedded processing technologies, with deep expertise in automotive-grade power management ICs.
The LM43600-Q1 belongs to TI's automotive-optimized DC-DC buck converter family, designed specifically for robust, low-EMI, wide-input power conversion in safety-critical vehicle subsystems.
FAQ
What is the maximum input voltage rating for LM43600QPWPTQ1?
The LM43600QPWPTQ1 has an absolute maximum input voltage rating of 42 V, with recommended operating range from 3.5 V to 36 V. This allows it to withstand automotive load-dump transients while maintaining regulation during cold-crank conditions down to 3.5 V. The 42 V rating is validated per AEC-Q100 stress testing protocols.
Does LM43600QPWPTQ1 support synchronization to an external clock?
Yes, LM43600QPWPTQ1 supports external clock synchronization via the SYNC pin, accepting input frequencies from 200 kHz to 2.2 MHz with TTL-compatible thresholds (0.4 V low, 2 V high). This enables deterministic switching alignment in multi-rail systems to avoid beat frequencies and reduce conducted EMI.
How does the precision enable function work on LM43600QPWPTQ1?
The LM43600QPWPTQ1 features a precision enable input (EN pin) with a typical rising threshold of 2.1 V and 305 mV hysteresis, allowing accurate system-level undervoltage lockout (UVLO) programming. When EN rises above 2.1 V, the device starts switching; when it falls below 1.8 V, regulation stops-enabling controlled power sequencing in automotive ECUs.
Can LM43600QPWPTQ1 operate with ceramic output capacitors only?
Yes, LM43600QPWPTQ1 is internally compensated and stable with "almost any combination" of ceramic, polymer, tantalum, or aluminum output capacitors-as confirmed in the datasheet. No external compensation network is required, reducing BOM count and simplifying layout for compact automotive power supplies.
What thermal management provisions does LM43600QPWPTQ1 include?
LM43600QPWPTQ1 incorporates thermal shutdown at 160 °C with 10 °C hysteresis, and its 16-pin HTSSOP package features an exposed thermal pad (PAD) connected to AGND. The datasheet specifies RθJA = 39.9 °C/W on a 4-layer board, requiring direct soldering of the PAD to a large PCB ground plane for effective heat dissipation in automotive enclosures.
LM43600QPWPTQ1 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:
- Not For New Designs
- 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
LM43600QPWPTQ1 FAQ
1.How can I place an order for LM43600QPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43600QPWPTQ1 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 LM43600QPWPTQ1 reliable?
The price and inventory of LM43600QPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43600QPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM43600QPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43600QPWPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43600QPWPTQ1?
LM43600QPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43600QPWPTQ1 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 LM43600QPWPTQ1?
For technical support, including LM43600QPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43600QPWPTQ1 requirements.
6.How does Aetrix verify that LM43600QPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM43600QPWPTQ1 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 LM43600QPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM43600QPWPTQ1?
All LM43600QPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43600QPWPTQ1, 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 LM43600QPWPTQ1 part is unused and in its original packaging.
Return procedure for LM43600QPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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