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Texas Instruments LM43600QPWPRQ1
- Part No.:
- LM43600QPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43600QPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 500MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,997
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Product details
Overview
LM43600QPWPRQ1 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.
For engineers reviewing the LM43600QPWPRQ1 datasheet, LM43600QPWPRQ1 pinout, LM43600QPWPRQ1 application, or LM43600QPWPRQ1 equivalent, key selection considerations include its precision enable threshold (2.1 V ±0.22 V), PGOOD flag with 13% overvoltage/17% undervoltage hysteresis, adjustable 200–2200 kHz switching frequency, and HTSSOP-16 thermal performance (RθJA = 39.9°C/W).
Technical Context
The LM43600QPWPRQ1 employs fixed-frequency peak current mode control with automatic transition into 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 wide capacitor type compatibility.
It integrates high-side (419 mΩ) and low-side (231 mΩ) MOSFETs, a precision 1.016 V feedback reference (±1.5% over –40°C to +125°C), and robust protection including hiccup-mode short-circuit response, thermal shutdown at 160°C, and cycle-by-cycle current limiting with 1.33 A peak inductor current limit.
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 rail variations including cold-crank and load-dump conditions. |
| Output Current | 0.5 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in sub-AM band automotive systems. |
| Quiescent Current | 33 µA in regulation - enables always-on functionality without excessive battery drain in automotive infotainment or body control modules. |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) - allows optimization for EMI suppression (lower fSW) or compact solution size (higher fSW). |
| Feedback Reference | 1.016 V ±1.5% (–40°C to +125°C) - ensures accurate output voltage regulation across automotive temperature extremes. |
| Power-Good Flag | Open-drain PGOOD with 113% OV / 83% UV thresholds - provides reliable system power sequencing and fault detection. |
| Thermal Resistance | RθJA = 39.9°C/W (HTSSOP-16) - enables 0.5 A operation without forced airflow in typical automotive PCB layouts. |
Pinout & Package
LM43600QPWPRQ1 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 enhanced 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 PCB trace to minimize EMI and voltage spikes. |
| CBOOT (3) | Bootstrap capacitor connection | 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 capacitor; 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 capacitor required if used. |
| SYNC (6) | External clock input | Enables synchronization to master clock (200–2200 kHz); must be terminated properly or grounded if unused. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; floating defaults to 500 kHz - enables precise EMI tuning. |
| PGOOD (8) | Power-good flag | Open-drain output indicating regulated output; requires 10–100 kΩ pull-up to logic rail ≤12 V. |
| FB (9) | Feedback sense | Monitors output via resistor divider; 1.016 V reference sets VOUT = 1.016 × (1 + RFBT/RFBB). |
| AGND (10) | Analog ground | Reference for internal references and error amplifier - must connect to clean system ground plane. |
| SS/TRK (11) | Soft-start/track control | Controls startup slew rate (internal 4.1 ms) or enables output voltage tracking of another supply. |
| EN (12) | Enable input | Logic-level control (2.1 V threshold) for precision UVLO; supports resistor-divider bias from VIN or external logic. |
| VIN (13,14) | Main input supply | Connects to input capacitor (CIN) and high-side FET - shortest possible path to PGND critical for stability. |
| PGND (15,16) | Power ground | Low-side FET return; connects to CIN, COUT, 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 under-hood and cabin electronics with full reliability testing. |
| Light-load efficiency | DCM and PFM modes reduce IQ to 33 µA - extends battery life in always-on automotive subsystems without compromising regulation. |
| EMI compliance | Tested to EN55022/CISPR 22 Class B radiated/conducted emissions - simplifies automotive EMC validation with minimal external filtering. |
| Flexible soft-start | Internal 4.1 ms ramp + external capacitor extension - prevents inrush current and enables controlled power-up into pre-biased outputs. |
| Output voltage tracking | SS/TRK pin accepts external ramp - allows coordinated sequencing with other rails in multi-voltage systems like ADAS processors. |
| Short-circuit protection | Hiccup mode with 5.5 ms retry delay - limits power dissipation during sustained faults while maintaining system recoverability. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Powers SoC, memory, and display interface in automotive head units with variable battery input (6–16 V). IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 12 V battery to 3.3 V/5 V for digital subsystems. Use Value: 33 µA quiescent current prevents parasitic drain during vehicle sleep mode; PGOOD enables safe MCU reset sequencing. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view cameras requiring low-noise, stable 1.8 V/3.3 V rails. IC Role / Device Role / Timing Role: Synchronous buck converter with precise enable and tracking for multi-rail camera power sequencing. Use Value: Internal compensation and ceramic-capacitor compatibility reduce BOM count and board space; thermal performance sustains 0.5 A in sealed enclosures. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Regulates power for door lock actuators, lighting drivers, and CAN transceivers in harsh under-dash environments. IC Role / Device Role / Timing Role: Wide-VIN buck converter providing isolated 5 V rail from noisy 12 V battery with EMI robustness. Use Value: 42 V transient tolerance handles load-dump events; SYNC pin enables clock alignment with main processor to reduce system-wide EMI peaks. |
Use Scenario: Powers LTE modem, GNSS receiver, and security MCU in cellular-connected vehicle gateways operating across global voltage standards. IC Role / Device Role / Timing Role: Automotive-grade DC-DC converter delivering 0.5 A at 3.3 V with precision enable for secure boot sequencing. Use Value: AEC-Q100 qualification ensures long-term reliability; adjustable frequency avoids interference with cellular bands (700 MHz–2.6 GHz). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43601QPWPRQ1 | 1 A output current, identical pinout and feature set - higher current capability with same footprint and control interface. | Suitable for systems scaling beyond 0.5 A, e.g., multi-core MCUs or dual-sensor modules requiring >500 mA. | Select when future-proofing for higher load or consolidating BOMs across 0.5 A/1 A variants. |
| LM46002QPWPRQ1 | 2 A output, 3.5–60 V input, same HTSSOP-16 package - wider input range and doubled current, but higher RDS(on) (HS: 220 mΩ, LS: 120 mΩ). | Required for high-input-voltage applications (e.g., commercial truck 24 V systems) or dual-rail supplies drawing >1 A. | Choose when input exceeds 36 V or load exceeds 0.5 A - verify thermal margin due to higher power dissipation. |
Compared with LM43601QPWPRQ1 and LM46002QPWPRQ1, LM43600QPWPRQ1 offers optimal thermal and efficiency balance for 0.5 A automotive loads, with lower quiescent current than the 1 A/2 A variants and superior light-load performance due to its optimized control architecture.
Availability
LM43600QPWPRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control modules requiring stable component supply with AEC-Q100 qualification and long-term production support.
Supply support for LM43600QPWPRQ1 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 technologies with deep expertise in automotive-grade IC design and manufacturing.
The LM43600-Q1 belongs to TI's automotive-qualified DC-DC converter family designed specifically for demanding automotive power applications requiring high reliability, wide input range, and integrated protection features.
FAQ
What is the maximum input voltage transient rating for LM43600QPWPRQ1?
The LM43600QPWPRQ1 is rated for 42 V transient input voltage, allowing it to withstand automotive load-dump events without damage or regulation loss. This specification is defined in the Absolute Maximum Ratings table and validated per ISO 7637-2 Pulse 5a requirements. The device maintains regulation down to 3.5 V input, making LM43600QPWPRQ1 suitable for cold-crank and wide-battery-range automotive applications.
Does LM43600QPWPRQ1 require external compensation components?
No, LM43600QPWPRQ1 features internal compensation, eliminating the need for external Type II or Type III compensation networks. This reduces BOM count, PCB area, and design complexity while ensuring stable operation with ceramic, polymer, tantalum, or aluminum output capacitors. The internal loop is optimized for the integrated MOSFETs and typical external component values specified in the datasheet for LM43600QPWPRQ1.
How does the PGOOD flag on LM43600QPWPRQ1 behave during startup and fault conditions?
The PGOOD flag on LM43600QPWPRQ1 asserts high after output voltage reaches 113% of the FB reference (≈1.15 V) and remains high until VOUT falls below 83% of reference (≈0.84 V), providing 6% hysteresis. During startup, it transitions high after soft-start completes; during overvoltage, undervoltage, or thermal shutdown, it pulls low via 40–125 Ω internal pulldown. This behavior is fully characterized in the Electrical Characteristics table for LM43600QPWPRQ1.
Can LM43600QPWPRQ1 synchronize to an external clock, and what are the valid frequency and duty cycle ranges?
Yes, LM43600QPWPRQ1 supports external clock synchronization via the SYNC pin across 200 kHz to 2.2 MHz, matching its adjustable frequency range. Valid input requires logic-high ≥2 V and logic-low ≤0.4 V, with minimum ON/OFF time of 80 ns and duty cycle between 10% and 90%. These timing constraints ensure reliable edge detection and prevent false triggering, as verified in the Switching Characteristics section of the LM43600QPWPRQ1 datasheet.
What thermal performance can be expected from LM43600QPWPRQ1 in a standard 4-layer PCB layout?
In a standard 4-layer PCB with 1-inch² copper pour under the thermal pad, LM43600QPWPRQ1 achieves RθJA = 39.9°C/W. At 0.5 A load with 12 V input and 3.3 V output, power dissipation is ~0.4 W, resulting in ~16°C junction-to-ambient rise above ambient - well within the –40°C to +125°C operating range. This thermal performance is measured per JESD 51-7 and confirmed in the Thermal Information table for LM43600QPWPRQ1.
LM43600QPWPRQ1 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
LM43600QPWPRQ1 FAQ
1.How can I place an order for LM43600QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43600QPWPRQ1 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 LM43600QPWPRQ1 reliable?
The price and inventory of LM43600QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43600QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM43600QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43600QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43600QPWPRQ1?
LM43600QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43600QPWPRQ1 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 LM43600QPWPRQ1?
For technical support, including LM43600QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43600QPWPRQ1 requirements.
6.How does Aetrix verify that LM43600QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM43600QPWPRQ1 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 LM43600QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM43600QPWPRQ1?
All LM43600QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43600QPWPRQ1, 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 LM43600QPWPRQ1 part is unused and in its original packaging.
Return procedure for LM43600QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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