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Texas Instruments LM43600PWPR
- Part No.:
- LM43600PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43600PWPR.pdf
- Description:
- IC REG BUCK ADJ 500MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,239
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Product details
Overview
LM43600PWPR from Texas Instruments is a 3.5-V to 36-V, 0.5-A synchronous step-down DC-DC converter in HTSSOP-16 package. It delivers high efficiency across load range via peak current mode control with DCM/PFM light-load operation, features internal compensation, 33-µA quiescent current in regulation, and meets EN55022 Class B EMI limits - deployed in industrial power supplies and automotive sub-AM band systems.
For engineers reviewing the LM43600PWPR datasheet, LM43600PWPR pinout, LM43600PWPR application, or LM43600PWPR equivalent, key selection criteria include input voltage range (3.5–36 V), output current capability (0.5 A), switching frequency adjustability (200 kHz–2.2 MHz), power-good flag, and precision enable threshold (2.1 V typical) for system-level UVLO programming.
Technical Context
The LM43600PWPR 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. Its internal compensation eliminates external type-II/III networks, while the RT pin allows resistor-based frequency tuning from 200 kHz to 2.2 MHz (default 500 kHz).
It integrates high-side (419 mΩ) and low-side (231 mΩ) MOSFETs, supports soft-start into pre-biased loads, offers output voltage tracking via SS/TRK pin, and includes hiccup-mode short-circuit protection, thermal shutdown (160°C), and precision enable with 305-mV hysteresis - all in a thermally enhanced 16-pin 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-input industrial and automotive rails; withstands 42-V transients. |
| Output Current | 0.5 A continuous - sufficient for point-of-load regulation in FPGA I/O, microcontroller cores, and sensor subsystems. |
| Quiescent Current | 33 µA in regulation - enables always-on operation in battery-backed or energy-sensitive applications. |
| Switching Frequency | 200 kHz to 2.2 MHz adjustable - allows optimization for size (high-freq) or efficiency (low-freq); default 500 kHz. |
| Feedback Reference | 1.016 V ±12 mV - enables accurate output regulation from 1 V to 28 V using standard resistor dividers. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B - reduces need for external filtering in commercial-grade emissions environments. |
| Thermal Resistance | RθJA = 39.9°C/W - requires minimal PCB copper area for thermal management in compact layouts. |
Pinout & Package
LM43600PWPR 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 an exposed thermal pad (PAD) connected internally to AGND for efficient 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 trace routing. |
| CBOOT (3) | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; requires 470-nF ceramic capacitor tied to SW. |
| VCC (4) | Internal LDO output | Bypassed to AGND; powers internal circuitry - no external load permitted. |
| BIAS (5) | Optional LDO input | Tie to VOUT (3.3–28 V) or external 3.3/5 V rail to improve efficiency; ground if unused. |
| SYNC (6) | External clock input | Enables synchronization to external 200 kHz–2.2 MHz clock; terminate properly to avoid ringing. |
| RT (7) | Frequency set resistor | Resistor to AGND programs switching frequency; open circuit defaults to 500 kHz. |
| PGOOD (8) | Open-drain power-good flag | Asserts when VOUT is within ±10% of target; requires 10–100 kΩ pull-up to logic rail ≤12 V. |
| FB (9) | Feedback sense input | Monitors resistive divider midpoint; sets output voltage with 1.016-V reference. |
| AGND (10) | Analog ground reference | Reference for FB, SS/TRK, EN, SYNC - connect directly to system ground plane. |
| SS/TRK (11) | Soft-start / tracking control | Internal 4.1-ms ramp when floating; add capacitor to extend time or apply external ramp for tracking. |
| EN (12) | Enable input | Logic-high (>2.1 V) enables regulator; precision threshold allows programmable system UVLO. |
| VIN (13,14) | Main input supply | Connects to input capacitor CIN; dual pins reduce IR drop and improve thermal performance. |
| PGND (15,16) | Power ground return | Low-side FET source connection; tie to AGND, PAD, and CIN/COUT grounds with minimal loop area. |
| PAD | Exposed thermal pad | Internally connected to AGND; must be soldered to large PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and improves full-load efficiency by ~5% vs. asynchronous designs. |
| Internal compensation | Removes need for external compensation network - simplifies design, reduces BOM count, and accelerates layout validation. |
| Stable with diverse output capacitors | Supports ceramic, polymer, tantalum, and aluminum electrolytic capacitors - increases flexibility in cost, size, and reliability trade-offs. |
| Power-good flag with deglitching | 220-µs rise/fall deglitch ensures robust system sequencing - prevents false asserts during transient events or startup overshoot. |
| Pre-biased soft-start | Allows safe startup into pre-charged output rails - avoids reverse current flow and protects downstream loads during hot-swap scenarios. |
| Hiccup-mode short-circuit protection | Enters current-limited retry mode after fault - limits average power dissipation and prevents thermal runaway during sustained overload. |
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 output with high efficiency across variable load (10 mA–500 mA) and line (18–36 V) conditions. Use Value: 33-µA quiescent current extends standby runtime; EN pin enables remote on/off control synchronized with system wake/sleep states. |
Use Scenario: Generating intermediate 5-V or 12-V rails for baseband processors, Ethernet PHYs, and optical transceivers in access equipment powered from -48-V telecom rectifiers. IC Role / Device Role / Timing Role: Wide-VIN buck converter handling input ripple and transients up to 42 V while maintaining tight output regulation under dynamic load steps. Use Value: Meets EN55022 Class B emissions without added filters - reduces board space and cost in densely packed telecom cards. |
| Sub-AM Band Automotive | High Efficiency Point-Of-Load Regulation |
|
Use Scenario: Powering infotainment display controllers, CAN transceivers, and sensor fusion units in 12-V vehicle architectures where cold-crank (up to 36 V) and load-dump (42 V) immunity are required. IC Role / Device Role / Timing Role: Primary DC-DC stage converting battery voltage to stable 3.3-V or 5-V supply with precision enable for ignition-synchronized power sequencing. Use Value: Precision enable threshold (2.1 V) and hysteresis (305 mV) allow reliable start-up above battery brownout thresholds and clean shutdown during cranking. |
Use Scenario: Delivering tightly regulated 1.2-V or 1.8-V core power to low-power microcontrollers (e.g., ARM Cortex-M), real-time clocks, and analog front-ends in portable instrumentation and IoT edge nodes. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck regulator operating in PFM/DCM at light loads (<10 mA) to maximize battery life. Use Value: 33-µA IQ enables multi-year operation on coin cells; internal soft-start prevents inrush current spikes that disrupt sensitive analog circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43601PWPR | 1-A output current, identical pinout and feature set - higher RDS(on) (HS: 470 mΩ, LS: 260 mΩ) but same thermal footprint. | Suitable for higher-current POE injectors or industrial sensors requiring >500 mA sustained load. | Select when load exceeds 0.5 A but board layout must remain unchanged. |
| TPS54331DR | 3-A rating, 3.5–28-V input, 1.5-MHz max frequency, no BIAS pin or EN hysteresis - uses external compensation. | Better suited for high-density, high-efficiency designs where layout space permits larger inductors and compensation components. | Choose for higher current or faster transient response where added design complexity is acceptable. |
Compared with LM43601PWPR, the LM43600PWPR provides lower conduction loss at ≤0.5-A loads and tighter enable hysteresis for robust cold-crank operation; versus TPS54331DR, it trades off current headroom for simpler layout, lower IQ, and integrated EMI mitigation - making it optimal for space-constrained, low-power industrial and automotive modules.
Availability
LM43600PWPR 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 lifecycle support, and consistent parametric performance across production batches.
Supply support for LM43600PWPR 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 decades of expertise in high-reliability DC-DC conversion and automotive-grade qualification.
The LM43600PWPR belongs to TI's wide-input synchronous buck regulator family designed for rugged, compact, and EMI-conscious power delivery in industrial automation, telecom infrastructure, and automotive subsystems - emphasizing ease-of-use, thermal resilience, and regulatory compliance.
FAQ
What is the maximum input voltage transient the LM43600PWPR can withstand?
The LM43600PWPR is rated for 42-V absolute maximum input voltage transients, as specified in Section 7.1 Absolute Maximum Ratings. This allows safe operation during automotive load-dump events and industrial surge conditions without external clamping - provided the steady-state VIN remains within the recommended 3.5–36-V operating range.
Does the LM43600PWPR require external compensation components?
No, the LM43600PWPR features internal compensation, eliminating the need for external type-II or type-III compensation networks. This simplifies design, reduces bill-of-materials count, and minimizes PCB layout sensitivity - confirmed in Section 8.3.2 and Figure 32 of the datasheet.
How does the BIAS pin improve efficiency in the LM43600PWPR?
When the BIAS pin is tied to VOUT (for 3.3–28 V outputs) or an external 3.3/5-V rail, the LM43600PWPR bypasses its internal VCC LDO, reducing power loss in the bias path. This lowers total quiescent current - especially beneficial in high-input-voltage, low-output-voltage configurations where VCC LDO dropout losses dominate.
Can the LM43600PWPR synchronize to an external clock, and what are the valid frequency ranges?
Yes, the LM43600PWPR accepts an external clock on the SYNC pin across 200 kHz to 2.2 MHz, matching its adjustable internal oscillator range. The clock must meet specified thresholds (VHIGH ≥2 V, VLOW ≤0.4 V) and duty cycle (10–90%), as detailed in Section 7.7 Switching Characteristics.
What thermal management considerations apply to the LM43600PWPR's exposed pad?
The exposed thermal pad (PAD) on the LM43600PWPR must be soldered to a large, low-thermal-resistance PCB ground plane - it is internally connected to AGND and serves as the primary heat dissipation path. Section 7.4 Thermal Information specifies RθJA = 39.9°C/W for a 4-layer board, and thermal performance degrades significantly if the pad is left unconnected or undersized.
LM43600PWPR 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
LM43600PWPR FAQ
1.How can I place an order for LM43600PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43600PWPR 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 LM43600PWPR reliable?
The price and inventory of LM43600PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43600PWPR is usually 5 days.
3.What payment methods are accepted for LM43600PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43600PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43600PWPR?
LM43600PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43600PWPR 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 LM43600PWPR?
For technical support, including LM43600PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43600PWPR requirements.
6.How does Aetrix verify that LM43600PWPR is sourced from the original manufacturer or authorized distributors?
All LM43600PWPR 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 LM43600PWPR meets industry standards.
7.What is the process for return or replacement of LM43600PWPR?
All LM43600PWPR units undergo pre-shipment inspection (PSI). If there is an issue with LM43600PWPR, 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 LM43600PWPR part is unused and in its original packaging.
Return procedure for LM43600PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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