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Texas Instruments LM43600PWPT
- Part No.:
- LM43600PWPT
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43600PWPT.pdf
- Description:
- IC REG BUCK ADJ 500MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,850
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Product details
Overview
LM43600PWPT from Texas Instruments is a 3.5-V to 36-V, 0.5-A synchronous step-down DC-DC converter in HTSSOP-16 (PWP) package. It delivers up to 0.5 A output current with 33 µA quiescent current in regulation, 500 kHz default switching frequency, and integrated synchronous rectification - enabling high-efficiency point-of-load regulation in industrial power supplies and automotive sub-AM band systems.
For engineers reviewing the LM43600PWPT datasheet, LM43600PWPT pinout, LM43600PWPT application, or LM43600PWPT equivalent, key selection criteria include its EN-controlled precision UVLO (2.1 V threshold), internal soft-start (4.1 ms), PGOOD flag, EMI-compliant design meeting EN55022 Class B, and compatibility with ceramic/polymer/tantalum output capacitors.
Technical Context
The LM43600PWPT employs fixed-frequency peak current mode control with automatic transition to discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) at light loads - ensuring high efficiency across 0–0.5 A load range. Its internal compensation eliminates external loop components, while programmable RT-based frequency tuning (200 kHz–2.2 MHz) supports layout-optimized switching.
It integrates dual MOSFETs (HS RDS(on) = 419 mΩ, LS RDS(on) = 231 mΩ), precision feedback reference (1.016 V typ), and robust protection including hiccup-mode short-circuit response, thermal shutdown (160 °C), and cycle-by-cycle current limiting - all within a thermally enhanced HTSSOP package with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide VIN applications including 12 V/24 V industrial rails and 36 V automotive transients (42 V absolute max). |
| Output Current | 0.5 A continuous - sufficient for low-power microcontrollers, sensors, and interface ICs without external heatsinking. |
| Quiescent Current | 33 µA in regulation - enables always-on operation in battery-backed or energy-sensitive systems. |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) - allows optimization for size (high-freq) or efficiency (low-freq) and synchronization to system clocks. |
| Feedback Reference | 1.016 V (±1.3% over –40°C to 125°C) - enables accurate output voltage setting with standard resistor dividers. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B radiated & conducted emissions - reduces need for external filtering in commercial-grade designs. |
| Thermal Resistance | RθJA = 39.9 °C/W (4-layer board) - enables full 0.5 A load at +85°C ambient with minimal PCB copper area. |
Pinout & Package
LM43600PWPT 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 thermal 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 bias supply output | Provides 3.3 V internal bias; must be bypassed to AGND with ≥1 µF capacitor - no external loading permitted. |
| BIAS (5) | Optional LDO input | Improves efficiency when tied to VOUT (3.3–28 V) or external 3.3/5 V rail; tie to GND if unused - never float. |
| SYNC (6) | External clock synchronization input | Accepts 200 kHz–2.2 MHz external clock; requires proper high-speed termination - connect to GND if unused. |
| RT (7) | Frequency programming resistor | Resistor to AGND sets switching frequency; open circuit yields 500 kHz default - enables precise EMI frequency placement. |
| PGOOD (8) | Open-drain power-good flag | Asserts high when VOUT is within ±10% of target; requires 10–100 kΩ pull-up to logic rail ≤12 V for system sequencing. |
| FB (9) | Feedback voltage sense | Monitors resistive divider midpoint; 1.016 V reference enables adjustable VOUT from 1 V to 28 V with <1% accuracy. |
| AGND (10) | Analog ground reference | Ground return for internal references and control circuitry - must be star-connected to PGND near device PAD. |
| SS/TRK (11) | Soft-start and tracking control | Internal 4.1-ms ramp when floating; add capacitor for extended soft-start or connect to external ramp for output voltage tracking. |
| EN (12) | Enable input with precision UVLO | Turns regulator on/off; 2.1 V rising threshold enables system-level brown-out protection and controlled power sequencing. |
| VIN (13,14) | Main input power supply | Connects to input capacitor bank; dual pins reduce IR drop and improve high-current path integrity - route close to PGND. |
| PGND (15,16) | Power ground return | Low-impedance return for high-side/low-side FETs and input/output capacitors - must be solidly connected to PAD and AGND. |
| PAD | Exposed thermal pad | Internally connected to AGND; primary heat dissipation path - must be soldered to large PCB copper pour for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing solution size and improving full-load efficiency by ~5–8% vs. asynchronous designs. |
| Internal compensation | Removes requirement for external Type-II/III compensation network - simplifies design, reduces BOM count, and improves stability margin. |
| Soft-start into pre-biased load | Prevents reverse current flow during startup when output capacitor is already charged - essential for hot-swap and multi-rail systems. |
| Power-good (PGOOD) flag | Provides system-level power sequencing and fault detection with 110%/90% FB voltage thresholds and 6% hysteresis. |
| EMI-optimized design | Meets EN55022 Class B without input filter - achieved via optimized pinout, integrated bootstrap, and controlled slew rates. |
| Wide capacitor compatibility | Stable with ceramic, polymer, tantalum, and aluminum electrolytic output capacitors - increases design flexibility and cost options. |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
|
Use Scenario: Providing isolated 3.3 V or 5 V bias rails for PLC I/O modules, motor drivers, and fieldbus interfaces operating from 24 V DC distribution buses. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated low-noise power to analog front-ends and digital logic. Use Value: 33 µA quiescent current enables always-on monitoring; EN-controlled UVLO ensures clean startup during brownouts. |
Use Scenario: Generating 5 V or 12 V intermediate rails for base station RF front-ends, optical transceivers, and packet-processing ASICs. IC Role / Device Role / Timing Role: Point-of-load converter placed near high-speed logic to minimize voltage droop and noise coupling. Use Value: 500 kHz default frequency balances efficiency and size; PGOOD flag synchronizes FPGA configuration sequence. |
| Sub-AM Band Automotive | High Efficiency Point-Of-Load Regulation |
|
Use Scenario: Powering infotainment displays, ADAS camera modules, and body control units from 12 V battery with cold-crank tolerance down to 3.5 V. IC Role / Device Role / Timing Role: Main DC-DC regulator handling wide-input transients and meeting automotive EMI requirements. Use Value: EN55022 Class B compliance eliminates need for external EMI filters; 42 V transient rating covers load-dump events. |
Use Scenario: Supplying 1.8 V or 3.3 V to low-power microcontrollers (e.g., MSP430, STM32L), sensors, and IoT edge nodes. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter enabling multi-year battery life in energy-harvesting or coin-cell applications. Use Value: 33 µA IQ extends runtime; DCM/PFM operation maintains >85% efficiency at 10 µA load current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43601PWPT | 1-A output current, identical pinout and feature set - higher current capability with same footprint and control architecture. | Suitable where future scalability or higher peak loads (e.g., sensor bursts) require headroom beyond 0.5 A. | Select LM43601PWPT when load current exceeds 0.5 A or when designing for platform reuse across multiple current tiers. |
| LM46002QPWPTQ1 | Automotive-grade (AEC-Q100 Grade 1), 2-A output, same PWP package - includes enhanced ESD (±3 kV HBM) and wider temp range (–40°C to 150°C). | Required for under-hood automotive applications demanding qualification, higher reliability, and extended temperature operation. | Choose LM46002QPWPTQ1 only for automotive safety-critical or high-temp environments - not drop-in for commercial use. |
Compared with LM43600PWPT, LM43601PWPT offers scalable current capacity without layout changes, while LM46002QPWPTQ1 adds automotive qualification and higher current but requires validation for non-automotive use - making LM43600PWPT optimal for cost-sensitive, space-constrained commercial industrial designs.
Availability
LM43600PWPT is available at Aetrix Electronics and suitable for industrial power supplies, telecommunications systems, and sub-AM band automotive applications requiring stable component supply, long-term production support, and consistent parametric performance.
Supply support for LM43600PWPT 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 - serving industrial, automotive, and communications markets with high-reliability, application-optimized ICs.
The LM43600PWPT belongs to TI's wide-input synchronous buck regulator family designed for compact, efficient, and EMI-compliant DC-DC conversion in space- and power-constrained systems - emphasizing ease of use, internal compensation, and robust protection.
FAQ
What is the maximum input voltage rating for LM43600PWPT?
The LM43600PWPT has an absolute maximum input voltage rating of 42 V, with recommended operating range from 3.5 V to 36 V. This allows safe operation during automotive load-dump transients and industrial 36 V bus variations while maintaining regulation down to 3.5 V for cold-crank scenarios.
Does LM43600PWPT require external compensation components?
No, LM43600PWPT features internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This reduces BOM count, simplifies layout, and improves stability margin across all supported output capacitors - including ceramic, polymer, and tantalum types.
How does the EN pin function on LM43600PWPT?
The EN pin on LM43600PWPT provides precision enable control with a 2.1 V rising threshold and 2.42 V hysteresis, enabling system-level undervoltage lockout. When pulled high above threshold, the device starts switching; below 0.4 V, it enters shutdown with 1.1 µA quiescent current - supporting controlled power sequencing.
Can LM43600PWPT synchronize to an external clock?
Yes, LM43600PWPT supports frequency synchronization via the SYNC pin, accepting external clocks from 200 kHz to 2.2 MHz. The pin requires proper high-speed termination to prevent ringing, and must be grounded if unused - enabling deterministic EMI reduction and system-level clock alignment.
What thermal performance can be expected from LM43600PWPT in a standard PCB layout?
With a 4-layer PCB and adequate copper pour connected to the exposed PAD, LM43600PWPT achieves RθJA = 39.9 °C/W. At 0.5 A load and 25 °C ambient, junction temperature rise is ~20 °C - well within the 125 °C max rating, enabling full-rated operation without forced air or heatsinks.
LM43600PWPT 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM43600PWPT FAQ
1.How can I place an order for LM43600PWPT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43600PWPT 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 LM43600PWPT reliable?
The price and inventory of LM43600PWPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43600PWPT is usually 5 days.
3.What payment methods are accepted for LM43600PWPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43600PWPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43600PWPT?
LM43600PWPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43600PWPT 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 LM43600PWPT?
For technical support, including LM43600PWPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43600PWPT requirements.
6.How does Aetrix verify that LM43600PWPT is sourced from the original manufacturer or authorized distributors?
All LM43600PWPT 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 LM43600PWPT meets industry standards.
7.What is the process for return or replacement of LM43600PWPT?
All LM43600PWPT units undergo pre-shipment inspection (PSI). If there is an issue with LM43600PWPT, 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 LM43600PWPT part is unused and in its original packaging.
Return procedure for LM43600PWPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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