My Inquiry
My Account
Texas Instruments LM43601QPWPTQ1
- Part No.:
- LM43601QPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43601QPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,936
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM43601QPWPTQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC-DC converter delivering up to 1 A output current from a 3.5 V to 36 V input, featuring 33 µA quiescent current in regulation, adjustable 200 kHz–2.2 MHz switching frequency, and integrated power-good (PGOOD) flag. It enables compact, high-efficiency point-of-load regulation in automotive sub-AM band systems.
For engineers reviewing the LM43601QPWPTQ1 datasheet, LM43601QPWPTQ1 pinout, LM43601QPWPTQ1 application, or LM43601QPWPTQ1 equivalent, key selection considerations include its automotive-grade thermal performance (–40°C to +125°C ambient), precision enable threshold (2.1 V typical), internal soft-start (4.1 ms), and EN55022 Class B radiated emissions compliance without external filtering.
Technical Context
The LM43601QPWPTQ1 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 0–1 A load range. Its internal compensation eliminates the need for external loop components while supporting stable operation with ceramic, polymer, tantalum, or aluminum output capacitors.
It integrates both high-side (419 mΩ typical RDS(on)) and low-side (231 mΩ typical RDS(on)) MOSFETs, features programmable frequency via RT pin, supports external clock synchronization (200 kHz–2.2 MHz), and provides output voltage tracking and soft-start into pre-biased loads - all within a thermally enhanced HTSSOP-16 package with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide automotive battery transients up to 42 V, enabling direct connection to 12 V/24 V vehicle systems without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in ADAS and body electronics modules. |
| Quiescent Current | 33 µA in regulation - enables always-on functionality in low-power automotive subsystems without excessive battery drain. |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) - allows optimization for size (high-freq) or efficiency (low-freq), and avoids AM radio band interference. |
| Feedback Reference Voltage | 1.016 V ±12 mV - enables precise output regulation (e.g., 3.3 V ±1%) using standard resistor dividers with <1% tolerance. |
| Thermal Shutdown | 160°C junction shutdown with 150°C recovery - protects against sustained overload or poor heatsinking in enclosed automotive environments. |
| EMI Compliance | EN55022/CISPR 22 Class B radiated emissions met - reduces need for external EMI filters and simplifies EMC validation in automotive designs. |
Pinout & Package
LM43601QPWPTQ1 is housed in a thermally enhanced 16-pin HTSSOP (PWP) package (6.6 mm × 5.1 mm × 1.2 mm, 0.65 mm pitch) with an exposed thermal pad (PAD) connected internally to AGND and serving as the primary heat dissipation path to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high di/dt switching current - requires short, low-inductance layout 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 - no external load permitted; floating or shorted to ground causes malfunction. |
| BIAS (5) | Optional LDO input | Tie to VOUT (if ≥3.3 V) or external 3.3/5 V rail to improve light-load efficiency; tie to PGND if unused - never float. |
| SYNC (6) | External clock input | Enables synchronization to system clock (200 kHz–2.2 MHz); requires proper high-speed termination - connect to AGND if unused. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open-circuit defaults to 500 kHz - enables precise EMI band placement and noise avoidance. |
| PGOOD (8) | Power-good flag | Open-drain output asserting when VOUT is within ±7% of target; requires 10–100 kΩ pull-up to logic rail ≤12 V for system sequencing. |
| FB (9) | Feedback sense | Monitors output voltage divider midpoint; 1.016 V reference enables accurate output setting - avoid PCB leakage paths near this pin. |
| AGND (10) | Analog ground | Reference for feedback, soft-start, and internal references; must be connected to system ground with low-impedance path, separate from PGND where possible. |
| SS/TRK (11) | Soft-start / tracking | Controls startup slew rate (internal 4.1 ms) or enables output voltage tracking of another supply when driven externally. |
| EN (12) | Enable input | Logic-level control (2.1 V typical turn-on threshold); supports precision UVLO programming via resistor divider - never float. |
| VIN (13,14) | Main input supply | Connects to input capacitor (CIN); dual pins reduce IR drop and improve thermal performance - keep trace to CIN/PGND extremely short. |
| PGND (15,16) | Power ground | Low-side FET source connection; ties to CIN/COUT grounds and thermal pad - forms high-current return path requiring solid copper pour. |
| PAD | Thermal pad | Internally connected to AGND; must be soldered to large PCB ground plane for thermal management and EMI reduction - not electrically optional. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) - certified for under-hood and cabin applications without derating. |
| Synchronous rectification | Integrated high-side (419 mΩ) and low-side (231 mΩ) MOSFETs - eliminates external Schottky loss, improves full-load efficiency by >5% vs. asynchronous designs. |
| Light-load efficiency mode | Automatic DCM/PFM operation below ~100 mA - maintains >85% efficiency at 1 mA load, critical for always-on automotive modules. |
| Internal compensation | No external compensation network required - reduces BOM count, PCB area, and design iteration time for stable loop response. |
| Pre-biased soft-start | Safe startup into pre-charged output rails - prevents reverse current flow and protects downstream circuitry during hot-plug or power sequencing. |
| Short-circuit hiccup protection | Current-limit fault detection followed by 5.5 ms retry delay and 32-cycle wait - limits average power dissipation during sustained shorts, preventing thermal runaway. |
Applications
| Automotive Sub-AM Band Power Supply | Telecom Point-of-Load Regulation |
|---|---|
|
Use Scenario: Powering RF receivers, CAN transceivers, and microcontrollers in automotive infotainment head units operating near AM radio bands (530–1710 kHz). IC Role / Device Role / Timing Role: Primary buck regulator providing clean, low-noise 3.3 V/5 V rails with frequency programmability to avoid AM band interference. Use Value: 200 kHz–2.2 MHz adjustable switching frequency enables placement outside sensitive AM band; EN55022 Class B compliance eliminates need for ferrite beads or shielding. |
Use Scenario: Generating stable 5 V or 12 V supplies for line cards, optical modules, and baseband processors in telecom infrastructure equipment. IC Role / Device Role / Timing Role: High-efficiency, wide-input synchronous buck converter handling 24 V or 48 V backplane inputs with transient robustness. Use Value: 36 V max input and 42 V transient rating support unregulated telecom supplies; 1 A output sustains burst-mode processing loads without dropout. |
| Industrial Sensor Node Power | Automotive Body Control Module (BCM) |
|
Use Scenario: Powering ultra-low-power IoT sensor nodes with wake-on-event capability in factory automation or predictive maintenance systems. IC Role / Device Role / Timing Role: Always-on buck regulator supplying 3.3 V to MCU and analog front-end with minimal quiescent current draw. Use Value: 33 µA quiescent current extends battery life in energy-harvesting or long-life battery-powered deployments; precision enable supports controlled wake-up sequencing. |
Use Scenario: Regulating power for door modules, seat controllers, and lighting drivers in modern vehicle body electronics networks. IC Role / Device Role / Timing Role: AEC-Q100-compliant DC-DC converter delivering 1 A at 5 V or 3.3 V from 12 V battery with cold-crank support down to 3.5 V. Use Value: 3.5 V minimum input ensures operation during engine cranking; thermal shutdown and hiccup protection safeguard against motor stall or wiring faults. |
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 |
|---|---|---|---|
| LM43602QPWPTQ1 | 2 A output current, identical pinout and feature set; higher RDS(on) (HS: 220 mΩ, LS: 110 mΩ) optimized for higher load efficiency. | Required where sustained >1 A load current or higher thermal margin is needed; same PCB layout but larger input/output capacitance recommended. | Select when future-proofing for higher current or when operating near thermal limits with 1 A loads. |
| LM46002QPWPTQ1 | 2 A output, 3.5–60 V input range, same HTSSOP-16 package; includes spread-spectrum clocking and improved light-load PFM efficiency. | Better suited for 48 V industrial or commercial systems; spread spectrum reduces peak EMI but adds complexity to timing-critical applications. | Choose for wider VIN range or stricter EMI requirements; not drop-in due to different enable threshold and SS behavior. |
Compared with LM43602QPWPTQ1 and LM46002QPWPTQ1, the LM43601QPWPTQ1 offers optimal balance of size, cost, and thermal performance for 1 A automotive loads - avoiding overdesign while maintaining AEC-Q100 compliance and proven EMI behavior in production ECUs.
Availability
LM43601QPWPTQ1 is available at Aetrix Electronics and suitable for automotive sub-AM band power supplies, telecom point-of-load regulation, and industrial sensor node power requiring stable component supply, AEC-Q100 traceability, and long-term production continuity.
Supply support for LM43601QPWPTQ1 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 delivering analog, embedded processing, and connectivity solutions with deep automotive and industrial design expertise.
The LM43601QPWPTQ1 belongs to TI's automotive-qualified DC-DC converter family, engineered specifically for space-constrained, thermally demanding automotive subsystems requiring high reliability, low quiescent current, and EMI-compliant operation.
FAQ
What is the minimum input voltage required for the LM43601QPWPTQ1 to start switching?
The LM43601QPWPTQ1 requires a minimum input voltage of 3.8 V to initiate startup and enter regulation. Below this threshold, the device remains in undervoltage lockout (UVLO) and will not switch - ensuring reliable operation during automotive cold-crank events where battery voltage dips transiently.
Can the LM43601QPWPTQ1 safely start up into a pre-biased output voltage?
Yes, the LM43601QPWPTQ1 supports soft-start into pre-biased loads via its SS/TRK pin. When left floating, internal soft-start prevents reverse current flow; when driven externally, it enables controlled ramping of VOUT to match another supply - protecting downstream FETs and LDOs during hot-plug scenarios.
How does the BIAS pin affect efficiency in the LM43601QPWPTQ1?
When the BIAS pin is tied to VOUT (≥3.3 V) or an external 3.3 V/5 V rail, the LM43601QPWPTQ1 bypasses its internal VCC LDO, reducing quiescent current from 33 µA to ~6–11 µA (VIN-powered) or ~85–140 µA (BIAS-powered), significantly improving light-load efficiency in always-on automotive modules.
What is the purpose of the thermal pad (PAD) on the LM43601QPWPTQ1 package?
The exposed thermal pad on the LM43601QPWPTQ1 is internally connected to AGND and serves as the primary heat dissipation path. It must be soldered to a large PCB ground plane to achieve the specified RθJA of 39.9°C/W - omitting or undersizing this pad risks thermal shutdown under 1 A load at elevated ambient temperatures.
Does the LM43601QPWPTQ1 require external compensation components?
No, the LM43601QPWPTQ1 features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces component count, and guarantees stable loop response across all supported output capacitor types (ceramic, polymer, tantalum, aluminum) without tuning.
LM43601QPWPTQ1 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:
- 1A
- 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
LM43601QPWPTQ1 FAQ
1.How can I place an order for LM43601QPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43601QPWPTQ1 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 LM43601QPWPTQ1 reliable?
The price and inventory of LM43601QPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43601QPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM43601QPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43601QPWPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43601QPWPTQ1?
LM43601QPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43601QPWPTQ1 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 LM43601QPWPTQ1?
For technical support, including LM43601QPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43601QPWPTQ1 requirements.
6.How does Aetrix verify that LM43601QPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM43601QPWPTQ1 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 LM43601QPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM43601QPWPTQ1?
All LM43601QPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43601QPWPTQ1, 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 LM43601QPWPTQ1 part is unused and in its original packaging.
Return procedure for LM43601QPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM43601QPWPTQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
