My Inquiry
My Account
Texas Instruments LM43601QPWPRQ1
- Part No.:
- LM43601QPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43601QPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,990
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM43601QPWPRQ1 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 (500 kHz default), and integrated power-good flag with ±7% threshold hysteresis.
For engineers reviewing the LM43601QPWPRQ1 datasheet, LM43601QPWPRQ1 pinout, LM43601QPWPRQ1 application, or LM43601QPWPRQ1 equivalent, key selection considerations include automotive-grade thermal shutdown at 160°C, precision enable thresholds (2.1 V typical), internal soft-start (4.1 ms), and EN55022 Class B radiated emissions compliance verified on evaluation board.
Technical Context
The LM43601QPWPRQ1 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. It integrates both high-side (419 mΩ RDS(on)) and low-side (231 mΩ RDS(on)) NMOS power switches.
Internal compensation eliminates external loop components; frequency is set via RT pin resistor (200 kHz–2.2 MHz) or synchronized to external clock (200 kHz–2.2 MHz). The device supports output voltage tracking, pre-biased soft-start, and precision enable with 305 mV hysteresis for system-level UVLO programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide automotive battery rails including cold-crank (3.5 V) and load-dump transients (42 V max) |
| Output Current | Up to 1 A continuous - sufficient for microcontroller cores, sensors, and infotainment subsystems |
| Quiescent Current | 33 µA in regulation - enables always-on functionality in automotive body electronics without excessive battery drain |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) - allows optimization for EMI filtering (low-f) or compact magnetics (high-f) |
| Feedback Reference | 1.016 V ±1.5% over –40°C to +125°C - ensures stable 1% output accuracy across automotive temperature range |
| Thermal Shutdown | 160°C junction shutdown with 150°C recovery - protects against sustained overload or poor heatsinking in enclosed modules |
| EMI Compliance | Tested to EN55022/CISPR 22 Class B - meets automotive radiated emission limits without external filters on standard layout |
Pinout & Package
LM43601QPWPRQ1 is housed in a thermally enhanced 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 and electrical connection to AGND/PGND.
| 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 and voltage spikes |
| CBOOT (3) | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; requires 470 nF ceramic capacitor between CBOOT and SW |
| VCC (4) | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; no external load permitted - powers internal logic and gate drivers |
| BIAS (5) | Optional LDO input | Tie to VOUT (if ≥3.3 V) or external 3.3/5 V rail to improve light-load efficiency; bypass with 1–10 µF capacitor |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; requires proper high-speed termination to prevent ringing - float or tie to AGND if unused |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open circuit = 500 kHz default - tolerance affects accuracy by ±10% |
| PGOOD (8) | Open-drain power-good flag | Asserts high when VOUT is within ±7% of target; requires 10–100 kΩ pull-up to ≤12 V logic rail |
| FB (9) | Feedback sense input | Monitors resistive divider midpoint; 1.016 V reference sets VOUT = 1.016 × (1 + RFBT/RFBB) - do not short to ground |
| AGND (10) | Analog ground reference | Reference for FB, SS/TRK, EN, PGOOD; connect directly to system ground plane - separate from PGND at single point |
| SS/TRK (11) | Soft-start / tracking control | Internal 4.1 ms ramp when floating; add capacitor to extend time or apply external ramp for output voltage tracking |
| EN (12) | Enable input | Logic-high (>2.1 V) enables regulator; precision threshold allows programmable system UVLO - do not float |
| VIN (13,14) | Main input supply | Connects to input capacitors (CIN); dual pins reduce IR drop and improve high-current path integrity |
| PGND (15,16) | Power ground return | Low-side FET source connection; tie to system ground, CIN/COUT grounds, and thermal pad - shortest possible path to CIN |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) - validated for under-hood and infotainment applications |
| Synchronous rectification | Integrated 419 mΩ HS / 231 mΩ LS MOSFETs - eliminates external Schottky loss, improves full-load efficiency by ~5% |
| Light-load efficiency mode | Automatic DCM and PFM operation - maintains >85% efficiency at 10 mA load (VIN=12 V, VOUT=3.3 V) |
| EMI-optimized design | Verified EN55022 Class B radiated emissions on EVM - reduces need for ferrite beads or metal shielding in production layout |
| Robust protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit response, thermal shutdown, and VCC UVLO - prevents damage during fault conditions |
| Flexible system integration | Tracking, pre-biased soft-start, and precision enable with hysteresis - supports multi-rail sequencing and battery-aware power management |
Applications
| ADAS Camera Power Supply | Automotive Infotainment Core Rail |
|---|---|
|
Use Scenario: Powers image sensor and ISP in rear-view or surround-view camera modules operating in engine bay or bumper locations. IC Role / Device Role / Timing Role: Primary 3.3 V or 5 V point-of-load regulator with tight output accuracy and low noise for analog pixel readout. Use Value: 1.016 V feedback reference ±1.5% ensures <±1% output drift over temperature; 33 µA IQ enables parking-mode operation without battery depletion. |
Use Scenario: Supplies core voltage to ARM-based application processors in head unit or digital cluster systems. IC Role / Device Role / Timing Role: High-efficiency buck converter with tracking capability to sequence with DDR memory or GPU rails. Use Value: SS/TRK pin supports voltage ramp alignment with companion regulators; 1 A output sustains burst processing loads without dropout. |
| Telematics Control Unit (TCU) Subsystem | Body Control Module (BCM) Sensor Hub |
|
Use Scenario: Generates isolated 5 V rail for LTE modem, GNSS receiver, and CAN transceivers in cellular-connected vehicle platforms. IC Role / Device Role / Timing Role: Wide-input buck regulator handling 6–16 V battery variations and 42 V load-dump transients. Use Value: 36 V max input and 42 V transient rating eliminate need for upstream TVS; EN55022 Class B compliance simplifies EMC certification. |
Use Scenario: Powers multiple LIN, CAN, and analog sensor interfaces in centralized body electronics architecture. IC Role / Device Role / Timing Role: Always-on 3.3 V supply with precision enable enabling wake-on-LIN/CAN and controlled system startup. Use Value: 2.1 V enable threshold with 305 mV hysteresis allows reliable wake-up from deep sleep; 160°C thermal shutdown prevents latch-up in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43602QPWPRQ1 | 2 A output current rating; identical pinout and feature set; higher RDS(on) (HS: 220 mΩ, LS: 110 mΩ) | Required where peak load exceeds 1 A (e.g., multi-core MCU or FPGA auxiliary rail) | Select when higher current headroom is needed without redesigning PCB layout |
| LM46002QPWPRQ1 | Same 1 A rating but optimized for lower IQ (15 µA) and wider frequency range (300 kHz–2.2 MHz); different pinout (no SYNC) | Preferred for ultra-low-power always-on nodes where EMI synchronization is unnecessary | Choose for battery-sensitive applications needing longer sleep duration, accepting loss of clock sync capability |
Compared with LM43602QPWPRQ1 and LM46002QPWPRQ1, the LM43601QPWPRQ1 provides optimal balance of automotive robustness, EMI control via SYNC, and moderate quiescent current - making it ideal for cost- and space-constrained 1 A subsystems requiring full feature integration.
Availability
LM43601QPWPRQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, telematics control units, and body control module designs requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LM43601QPWPRQ1 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 automotive-grade power management ICs with decades of automotive qualification expertise.
The LM43601-Q1 belongs to TI's automotive-qualified buck regulator family designed specifically for demanding vehicle subsystems requiring high reliability, wide input range, and EMI-compliant operation in constrained spaces.
FAQ
What is the maximum input voltage transient rating for the LM43601QPWPRQ1?
The LM43601QPWPRQ1 is rated for 42 V absolute maximum input voltage transients, supporting automotive load-dump conditions per ISO 7637-2. This rating applies to VIN-to-PGND stress; continuous operation remains limited to 36 V. The device incorporates internal clamping and thermal protection to survive these events without latch-up or parametric shift, provided PCB layout follows TI's recommended input capacitance and trace routing guidelines.
Does the LM43601QPWPRQ1 require external compensation components?
No, the LM43601QPWPRQ1 features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces BOM count, and improves production consistency. The internal loop is optimized for stability with ceramic, polymer, tantalum, or aluminum output capacitors - no additional RC networks or feed-forward capacitors are required for basic operation.
How does the precision enable function work on the LM43601QPWPRQ1?
The LM43601QPWPRQ1 EN pin provides precision enable with two distinct thresholds: 2.1 V (typical) for turn-on and 1.795 V (2.1 V − 305 mV hysteresis) for turn-off. This allows accurate system-level undervoltage lockout (UVLO) programming using simple resistor dividers from battery or intermediate rails. The hysteresis prevents oscillation near threshold and ensures clean, bounce-free startup and shutdown sequencing.
Can the LM43601QPWPRQ1 synchronize to an external clock, and what are the timing requirements?
Yes, the LM43601QPWPRQ1 accepts external synchronization via the SYNC pin across 200 kHz–2.2 MHz. Input thresholds are 2 V (high) and 0.4 V (low), with minimum pulse width of 80 ns and duty cycle range of 10%–90%. Proper high-speed termination (e.g., series resistor near source) is required to suppress ringing. When unused, SYNC must be tied to AGND - floating is prohibited.
What thermal performance can be expected from the LM43601QPWPRQ1 in a standard 4-layer PCB layout?
In a standard 4-layer PCB with 1-inch² copper pour connected to the thermal pad, the LM43601QPWPRQ1 achieves a junction-to-ambient thermal resistance (RθJA) of 39.9°C/W. At 1 A output with 12 V input and 3.3 V output, typical power dissipation is ~0.5 W, resulting in ~20°C junction-to-ambient rise above ambient - well within the –40°C to +125°C operating range. TI recommends minimum 250 mil² thermal pad area with ≥4 thermal vias to inner ground plane.
LM43601QPWPRQ1 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
LM43601QPWPRQ1 FAQ
1.How can I place an order for LM43601QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43601QPWPRQ1 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 LM43601QPWPRQ1 reliable?
The price and inventory of LM43601QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43601QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM43601QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43601QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43601QPWPRQ1?
LM43601QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43601QPWPRQ1 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 LM43601QPWPRQ1?
For technical support, including LM43601QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43601QPWPRQ1 requirements.
6.How does Aetrix verify that LM43601QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM43601QPWPRQ1 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 LM43601QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM43601QPWPRQ1?
All LM43601QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43601QPWPRQ1, 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 LM43601QPWPRQ1 part is unused and in its original packaging.
Return procedure for LM43601QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM43601QPWPRQ1 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…
