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Texas Instruments LM43601PWPR
- Part No.:
- LM43601PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43601PWPR.pdf
- Description:
- IC REG BUCK ADJ 1A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,977
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Product details
Overview
LM43601PWPR from Texas Instruments is a 3.5-V to 36-V, 1-A synchronous step-down DC-DC converter in HTSSOP-16 package. It delivers regulated output with 33-µA quiescent current in regulation, 500-kHz default switching frequency, and integrated power-good flag - enabling compact, high-efficiency point-of-load conversion in industrial and automotive sub-AM band systems.
For engineers reviewing the LM43601PWPR datasheet, LM43601PWPR pinout, LM43601PWPR application, or LM43601PWPR equivalent, key selection criteria include input voltage range (3.5–36 V), light-load efficiency via DCM/PFM, EN55022 Class B EMI compliance, precision enable threshold (2.1 V), and thermal shutdown at 160°C.
Technical Context
The LM43601PWPR employs fixed-frequency peak-current-mode control with internal compensation, supporting discontinuous conduction mode (DCM) and pulse-frequency modulation (PFM) at light loads to maintain high efficiency across 0–1 A output. Its architecture integrates both high-side (419 mΩ RDS(on)) and low-side (231 mΩ RDS(on)) NMOS switches, eliminating external rectifier losses.
Switching frequency is adjustable from 200 kHz to 2.2 MHz via RT pin resistor or synchronizable to external clock (200 kHz–2.2 MHz). The device features precision enable with 2.1 V rising threshold and 305-mV hysteresis, soft-start (4.1 ms internal), output tracking, and hiccup-mode short-circuit protection.
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 | 1 A continuous - sufficient for FPGA I/O, microcontroller cores, and sensor subsystems. |
| Quiescent Current | 33 µA in regulation - enables battery-backed or always-on applications without excessive standby drain. |
| Switching Frequency | 500 kHz default (200 kHz–2.2 MHz adjustable) - balances size (inductor/capacitor) and efficiency. |
| Feedback Reference | 1.016 V ±1.2% over –40°C to +125°C - ensures stable output accuracy across temperature. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B - reduces need for external filtering in emissions-sensitive designs. |
| Thermal Shutdown | 160°C trip / 150°C recovery - protects against sustained overload or poor heatsinking. |
Pinout & Package
LM43601PWPR 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. Thermal pad (PAD) connects internally to AGND and serves as primary heat dissipation path to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node | Connects to inductor; carries high di/dt switching current - requires short, low-inductance layout. |
| 3 CBOOT | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; requires 470-nF ceramic capacitor to SW. |
| 4 VCC | Internal LDO output | Bypass with capacitor to AGND; no external load permitted - powers internal circuitry. |
| 5 BIAS | Optional LDO input | Tie to VOUT (3.3–28 V) or external 3.3/5 V rail to improve efficiency; bypass with 1–10 µF. |
| 6 SYNC | External clock input | Synchronizes switching to external source (200 kHz–2.2 MHz); terminate properly to avoid ringing. |
| 7 RT | Frequency programming | Resistor to AGND sets frequency; open circuit = 500 kHz default. |
| 8 PGOOD | Open-drain power-good flag | Signals valid output (±7% FB window); requires 10–100 kΩ pull-up to ≤12 V logic rail. |
| 9 FB | Feedback sense input | Monitors resistive divider midpoint; 1.016 V reference sets VOUT = 1.016 × (1 + RFBT/RFBB). |
| 10 AGND | Analog ground reference | Ground for internal references and control logic - connect directly to system ground plane. |
| 11 SS/TRK | Soft-start / tracking control | Internal soft-start when floating; add capacitor to extend ramp time or apply external ramp for tracking. |
| 12 EN | Enable input | Active-high logic; 2.1 V threshold enables regulator - supports precise UVLO sequencing. |
| 13, 14 VIN | Main power input | Supplies high-side FET and internal LDO; bypass with high-frequency capacitors close to pins. |
| 15, 16 PGND | Power ground return | Low-side FET source connection; tie to AGND, PAD, and input/output capacitor grounds. |
| PAD | Exposed thermal pad | Internally connected to AGND; must be soldered to large PCB copper area for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and improves full-load efficiency by ~3–5%. |
| Internal compensation | Reduces external component count to only input/output caps, inductor, feedback divider, and optional RT - accelerates design cycle. |
| Stable with diverse output capacitors | Supports ceramic, polymer, tantalum, and aluminum electrolytic - simplifies sourcing and mitigates aging concerns. |
| Soft start into pre-biased load | Prevents reverse current flow during startup into powered rails - essential for hot-swap and multi-rail sequencing. |
| Output short-circuit protection | Hiccup mode limits average power during fault - avoids thermal runaway while enabling automatic recovery. |
| Adjustable precision enable | 2.1 V ±305 mV hysteresis allows accurate system-level undervoltage lockout without external comparators. |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
|
Use Scenario: 24-V DC distribution powering PLC I/O modules, sensors, and fieldbus interfaces. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 24 V to 3.3 V/5 V for digital logic and analog front-ends. Use Value: 33-µA quiescent current extends uptime in battery-buffered backup systems; EN55022 compliance avoids costly shielding. |
Use Scenario: Intermediate bus conversion in remote radio units and base station control cards. IC Role / Device Role / Timing Role: Secondary regulator stepping down 48 V intermediate bus to 12 V or 5 V for FPGA, PHY, and memory rails. Use Value: 1-A capability and 36-V max input support transient surges on telecom lines; PFM mode maintains >85% efficiency at 10-mA load. |
| Sub-AM Band Automotive | High Efficiency Point-Of-Load Regulation |
|
Use Scenario: Infotainment display backlight and audio amplifier supply in 12-V vehicle architectures. IC Role / Device Role / Timing Role: Compact buck converter delivering stable 5 V from noisy battery rail (3.5–18 V cold-crank range). Use Value: 42-V transient tolerance eliminates need for upstream TVS; precision enable (2.1 V) enables clean ignition-controlled startup. |
Use Scenario: Core voltage regulation for ARM Cortex-M7 microcontrollers and low-power SoCs. IC Role / Device Role / Timing Role: Final-stage regulator providing tightly regulated 1.2 V or 1.8 V from intermediate 3.3 V or 5 V rail. Use Value: Internal soft-start (4.1 ms) prevents inrush into low-ESR ceramic output caps; tracking capability supports multi-rail sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43600PWPR | 0.5-A output rating; identical pinout and feature set except lower current limit (1.25 A valley vs 1.1 A). | Suitable for lower-power peripherals where 1-A headroom is unnecessary - reduces cost and thermal load. | Select when load current remains ≤500 mA and board space/layout reuse is prioritized. |
| LM43602PWPR | 2-A output rating; same package, pinout, and control features - higher RDS(on) (HS: 220 mΩ, LS: 110 mΩ). | Required for higher-current rails (e.g., DDR memory termination, motor drivers) without changing PCB layout. | Choose when future-proofing for 2-A loads or upgrading existing LM43601 designs with minimal redesign effort. |
Compared with LM43600PWPR and LM43602PWPR, the LM43601PWPR provides optimal balance of current capability (1 A), thermal performance (39.9°C/W RθJA), and solution size - making it ideal for mid-range embedded systems where neither 0.5-A nor 2-A ratings are required.
Availability
LM43601PWPR 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 LM43601PWPR 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 LM43601PWPR belongs to TI's LM436xx family of wide-input synchronous buck regulators, designed specifically for space-constrained, thermally demanding applications in industrial automation, telecom infrastructure, and automotive subsystems.
FAQ
What is the maximum input voltage transient the LM43601PWPR can withstand?
The LM43601PWPR supports 42-V absolute maximum input voltage transients per its Absolute Maximum Ratings table. This allows reliable operation during load-dump events in 12-V automotive systems and surge conditions in industrial 24-V rails - provided external input protection (e.g., TVS) is sized appropriately for energy absorption.
Does the LM43601PWPR require an external bootstrap capacitor?
Yes, the LM43601PWPR requires a 470-nF ceramic capacitor connected between CBOOT and SW pins. This capacitor supplies gate-drive voltage for the high-side MOSFET during each switching cycle. Omitting or undersizing it causes erratic operation or failure to regulate - TI specifies X7R or better dielectric with low ESR.
Can the LM43601PWPR operate with ceramic output capacitors only?
Yes, the LM43601PWPR is explicitly characterized and stabilized with ceramic, polymer, tantalum, and aluminum electrolytic capacitors. Its internal compensation and wide ESR tolerance eliminate the need for minimum ESR requirements - enabling use of low-ESR, high-reliability ceramic capacitors without phase-margin risk.
How does the precision enable function work on the LM43601PWPR?
The LM43601PWPR's EN pin provides precision enable with a 2.1-V rising threshold and 305-mV hysteresis. When VIN rises, the regulator enables only after EN reaches 2.1 V - allowing accurate sequencing ahead of other rails. Hysteresis prevents chatter near threshold, ensuring robust startup under noisy supply conditions.
Is the LM43601PWPR pin-compatible with other devices in the LM436xx family?
Yes, the LM43601PWPR is pin-to-pin compatible with LM43600PWPR (0.5 A), LM43602PWPR (2 A), and LM43603PWPR (3 A) in the same HTSSOP-16 package. This enables scalable power design - users can upgrade or downgrade output current without modifying PCB layout or schematic connectivity.
LM43601PWPR 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:
- 1A
- 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
LM43601PWPR FAQ
1.How can I place an order for LM43601PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43601PWPR 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 LM43601PWPR reliable?
The price and inventory of LM43601PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43601PWPR is usually 5 days.
3.What payment methods are accepted for LM43601PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43601PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43601PWPR?
LM43601PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43601PWPR 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 LM43601PWPR?
For technical support, including LM43601PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43601PWPR requirements.
6.How does Aetrix verify that LM43601PWPR is sourced from the original manufacturer or authorized distributors?
All LM43601PWPR 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 LM43601PWPR meets industry standards.
7.What is the process for return or replacement of LM43601PWPR?
All LM43601PWPR units undergo pre-shipment inspection (PSI). If there is an issue with LM43601PWPR, 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 LM43601PWPR part is unused and in its original packaging.
Return procedure for LM43601PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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