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Texas Instruments LM43600PWP
- Part No.:
- LM43600PWP
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43600PWP.pdf
- Description:
- IC REG BUCK ADJ 500MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:157
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Product details
Overview
LM43600PWP 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 up to 0.5 A output current with 33 µA quiescent current in regulation, 500 kHz default switching frequency, and integrated synchronous rectification for high efficiency across load range. Used in industrial power supplies and sub-AM-band automotive systems where wide input voltage and low EMI are critical.
For engineers reviewing the LM43600PWP datasheet, LM43600PWP pinout, LM43600PWP application, or LM43600PWP equivalent, key selection factors include EN precision threshold (2.1 V typ), FB reference accuracy (±1.3% over –40°C to 125°C), PGOOD flag timing (220 µs deglitch), thermal shutdown (160°C), and EN55022 Class B radiated emissions compliance verified on LM43600PWPEVM.
Technical Context
The LM43600PWP employs fixed-frequency peak current mode control with automatic transition to DCM and PFM at light loads, enabling >90% efficiency down to 1 mA. Its internal compensation eliminates external loop components, while programmable RT-based frequency tuning (200 kHz–2.2 MHz) and external clock synchronization support layout-constrained or noise-sensitive designs.
It integrates dual MOSFETs (HS RDS(on) = 419 mΩ, LS RDS(on) = 231 mΩ), precision enable with 200 mV hysteresis, soft-start with 4.1 ms internal slew or external capacitor extension, and hiccup-mode short-circuit protection triggered by valley current limit (0.60 A typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports 12 V/24 V industrial rails and 36 V automotive transients (42 V absolute max). |
| Output Current | 0.5 A continuous - sufficient for point-of-load regulation of microcontrollers, sensors, and FPGAs. |
| Quiescent Current | 33 µA in regulation - enables always-on operation in battery-backed systems without rapid drain. |
| Switching Frequency | 200 kHz to 2.2 MHz adjustable via RT resistor - allows optimization for size (high-freq) or efficiency (low-freq). |
| Feedback Reference | 1.016 V ±1.3% (–40°C to 125°C) - ensures stable 1% output accuracy across temperature without trimming. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B radiated limits - validated on LM43600PWPEVM with no input filter required. |
| Thermal Shutdown | 160°C trip / 150°C recovery - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
LM43600PWP 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. The exposed thermal pad (PAD) must be soldered to PCB ground plane for effective heat dissipation (RθJB = 21.7°C/W).
| 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 to minimize EMI. |
| CBOOT (3) | Bootstrap supply | Drives high-side MOSFET gate; requires 470-nF ceramic capacitor between CBOOT and SW for reliable turn-on. |
| VCC (4) | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; powers internal circuitry - never connect external load or short to ground. |
| BIAS (5) | LDO input select | Tie to VOUT (3.3–28 V) to improve efficiency; tie to ground if unused - avoids floating state that causes instability. |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; requires proper termination to prevent ringing - ground if unused. |
| RT (7) | Frequency programming | Resistor to AGND sets frequency; open circuit defaults to 500 kHz - tolerance impacts accuracy (±10% typical). |
| PGOOD (8) | Power-good flag | Open-drain output; requires 10–100 kΩ pullup to ≤12 V rail - asserts after VOUT reaches 90% of target and stays within ±7%. |
| FB (9) | Feedback sense | Monitors resistive divider midpoint; 1.016 V reference sets VOUT = 1.016 × (1 + RFBT/RFBB) - avoid PCB leakage paths. |
| AGND (10) | Analog ground | Reference for FB, EN, SS/TRK, PGOOD - connect directly to system ground plane, separate from PGND return path. |
| SS/TRK (11) | Soft-start/tracking | Internal 4.1 ms ramp when floating; add capacitor to extend time or apply external ramp for voltage sequencing. |
| EN (12) | Enable control | Logic-compatible input; 2.1 V threshold enables regulator - supports precise UVLO programming with resistor divider. |
| VIN (13,14) | Main input supply | Connects to input capacitors (CIN); dual pins reduce IR drop and improve high-frequency decoupling. |
| PGND (15,16) | Power ground | Low-side MOSFET source return; tie to CIN/COUT ground, PAD, and AGND - shortest possible path to minimize noise. |
| PAD | Thermal pad | Internally connected to AGND/PGND; must be soldered to large copper area for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing solution size and improving full-load efficiency by ~5% vs asynchronous designs. |
| Internal compensation | Removes need for external Type-II/III compensation network - cuts BOM count and simplifies loop stability validation. |
| Stable with all capacitor types | Works reliably with ceramic, polymer, tantalum, and aluminum electrolytic output caps - avoids ESR dependency issues. |
| Power-good flag with deglitch | 220 µs digital filter prevents false PGOOD assertion during transient events - enables safe processor reset sequencing. |
| Soft-start into pre-biased load | Prevents reverse current flow when VOUT already present at startup - essential for hot-swap and multi-rail systems. |
| EMI-optimized pinout and layout | Separated power/analog grounds, dedicated PGND/VIN pairs, and SW routing guidance reduce radiated emissions by >10 dB. |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
Use Scenario: Providing isolated 3.3 V/5 V rails from 24 V or 48 V backplane in PLC I/O modules and gateway routers. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated output to FPGA I/O banks and Ethernet PHYs. Use Value: 33 µA quiescent current extends uptime in battery-buffered controllers; EN55022 compliance avoids costly shielding. |
Use Scenario: Point-of-load conversion for baseband processors and RF front-end bias in small-cell BTS equipment. IC Role / Device Role / Timing Role: Synchronous step-down regulator powering 1.2 V core and 3.3 V interface rails. Use Value: Adjustable 200 kHz–2.2 MHz switching enables noise avoidance in sensitive RF bands; PGOOD enables orderly boot. |
| Sub-AM Band Automotive | High Efficiency Point-Of-Load Regulation |
Use Scenario: Powering infotainment display controllers and ADAS camera modules in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Wide-VIN buck converter handling cold-crank (3.5 V) and load-dump (36 V) transients. Use Value: 42 V absolute input rating and thermal shutdown ensure reliability under harsh automotive conditions; SYNC pin enables spread-spectrum clocking. |
Use Scenario: Regulating 5 V or 12 V intermediate bus down to 1.8 V/3.3 V for MCU, sensor, and wireless SoC subsystems. IC Role / Device Role / Timing Role: Compact, high-efficiency DC-DC stage minimizing board space and heat generation. Use Value: HTSSOP-16 footprint (6.6 × 5.1 mm) fits dense layouts; internal soft-start prevents inrush current damage to downstream LDOs. |
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 |
|---|---|---|---|
| LM43601PWP | 1-A output current, identical pinout and feature set; higher RDS(on) (HS: 290 mΩ, LS: 160 mΩ) but same thermal package. | Required where load exceeds 0.5 A but board space and layout must remain unchanged. | Select LM43601PWP only if sustained >0.5 A load is confirmed; verify thermal margin with RθJA = 39.9°C/W. |
| LM46002QPWPRQ1 | Automotive-grade (AEC-Q100 Grade 1), 2-A output, same 16-pin HTSSOP; adds enhanced ESD (±4 kV HBM) and wider temp range (–40°C to 150°C). | Needed for under-hood or safety-critical automotive applications requiring qualification and extended temperature operation. | Choose LM46002QPWPRQ1 when automotive qualification, higher current, or 150°C junction operation is mandatory - not a drop-in replacement. |
Compared with LM43600PWP, LM43601PWP offers higher current in identical footprint but requires thermal reassessment, while LM46002QPWPRQ1 provides automotive qualification and 2× current at the cost of non-drop-in qualification overhead and higher BOM cost.
Availability
LM43600PWP 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.
Supply support for LM43600PWP 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.
The LM43600PWP belongs to TI's wide-input-voltage synchronous buck regulator family, designed specifically for space-constrained, thermally demanding applications in industrial, telecom, and automotive environments where efficiency, EMI, and robustness are critical.
FAQ
What is the minimum input voltage required for the LM43600PWP to start switching?
The LM43600PWP requires a minimum input voltage of 3.8 V to initiate startup and enter regulation. Below this threshold, the device remains in shutdown with only 1.1–3.1 µA quiescent current drawn. This VIN-MIN-ST specification ensures reliable turn-on across temperature and process variation, and is distinct from the wider 3.5–36 V operating range once regulation is established. Always verify input rail stability above 3.8 V during cold-crank or brownout conditions for LM43600PWP.
Can the LM43600PWP safely power a pre-biased output rail?
Yes, the LM43600PWP supports soft-start into pre-biased loads without reverse current flow. Its internal control logic disables the high-side MOSFET until the feedback voltage rises above the soft-start ramp, preventing output capacitor discharge through the IC. This behavior is confirmed in the functional description and validated on the LM43600PWPEVM. For reliable operation, ensure the SS/TRK pin is left floating or properly configured - do not force an external voltage ramp during pre-bias scenarios for LM43600PWP.
How does the BIAS pin affect efficiency in the LM43600PWP?
When the BIAS pin is tied to VOUT (for 3.3 V ≤ VOUT ≤ 28 V), the LM43600PWP bypasses its internal VCC LDO and uses the output rail to power internal circuitry, reducing total input current by ~130 µA compared to VCC-only operation. This improves light-load efficiency by up to 2% at 10 mA output. If BIAS is unused, it must be grounded - floating BIAS causes erratic operation. The efficiency gain is measurable and documented in TI's Electrical Characteristics table for LM43600PWP.
What is the purpose of the PAD pin on the LM43600PWP package?
The PAD is an exposed thermal pad on the underside of the HTSSOP-16 package, internally connected to AGND and PGND. It serves as the primary heat dissipation path - with RθJB = 21.7°C/W - and must be soldered to a large PCB copper area tied to system ground. Omitting PAD connection raises junction temperature by >30°C under 0.5 A load and degrades EMI performance. TI's layout guidelines require ≥8 thermal vias under the PAD for LM43600PWP to meet thermal and reliability specs.
Does the LM43600PWP require external compensation components?
No, the LM43600PWP features fully internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This reduces BOM count, PCB area, and design iteration time. The internal loop is optimized for stability with standard output capacitor types (ceramic, polymer, tantalum, aluminum), and TI's WEBENCH® Power Designer validates loop response using only the LM43600PWP's built-in compensation - no external RC components are specified or recommended in the datasheet.
LM43600PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM43600PWP FAQ
1.How can I place an order for LM43600PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43600PWP 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 LM43600PWP reliable?
The price and inventory of LM43600PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43600PWP is usually 5 days.
3.What payment methods are accepted for LM43600PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43600PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43600PWP?
LM43600PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43600PWP 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 LM43600PWP?
For technical support, including LM43600PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43600PWP requirements.
6.How does Aetrix verify that LM43600PWP is sourced from the original manufacturer or authorized distributors?
All LM43600PWP 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 LM43600PWP meets industry standards.
7.What is the process for return or replacement of LM43600PWP?
All LM43600PWP units undergo pre-shipment inspection (PSI). If there is an issue with LM43600PWP, 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 LM43600PWP part is unused and in its original packaging.
Return procedure for LM43600PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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