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Texas Instruments LM43602QPWPTQ1
- Part No.:
- LM43602QPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43602QPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,575
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Product details
Overview
LM43602QPWPTQ1 from Texas Instruments is an AEC-Q100 Grade 2 qualified synchronous step-down DC-DC converter delivering up to 2 A at output voltages from 1 V to 28 V, with input voltage range 3.5 V to 36 V (42 V abs max), 27 µA quiescent current in regulation, and integrated power-good flag - used in automotive sub-AM band power rails and industrial point-of-load systems.
For engineers reviewing the LM43602QPWPTQ1 datasheet, LM43602QPWPTQ1 pinout, LM43602QPWPTQ1 application, or LM43602QPWPTQ1 equivalent, key selection criteria include its 500 kHz default switching frequency (adjustable 200 kHz–2.2 MHz), internal compensation, PFM/DCM light-load efficiency mode, HTSSOP-16 thermal performance (RθJA = 38.9°C/W), and precision enable with 2.2 V ±0.22 V threshold.
Technical Context
The LM43602QPWPTQ1 employs fixed-frequency peak current mode control with cycle-by-cycle current limiting and automatic transition between continuous conduction mode (CCM), discontinuous conduction mode (DCM), and pulse frequency modulation (PFM) at light loads. Its internal compensation eliminates external loop components, while the 16-pin HTSSOP package integrates high-side (120 mΩ) and low-side (65 mΩ) MOSFETs with bootstrapped gate drive.
It supports synchronization to external clocks (200 kHz–2.2 MHz), programmable soft-start via external capacitor on SS/TRK, output voltage tracking, and precision enable with 290 mV hysteresis. Protection includes thermal shutdown (160°C), hiccup-mode short-circuit response, and VCC undervoltage lockout (3.1 V rising threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide automotive battery transients (42 V abs max); enables direct connection to 12 V/24 V vehicle systems without pre-regulation. |
| Output Current | 2 A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in ADAS and body control modules. |
| Switching Frequency | Default 500 kHz, adjustable 200 kHz–2.2 MHz via RT resistor - allows optimization for size (high-freq) or efficiency (low-freq) and EMI compliance. |
| Quiescent Current | 27 µA in regulation - extends battery life in always-on automotive subsystems such as telematics and infotainment standby modes. |
| Feedback Reference | 1.015 V ±13 mV (–40°C to +125°C) - enables accurate output regulation across automotive temperature range with minimal drift. |
| Thermal Resistance | RθJA = 38.9°C/W - validated on JEDEC 4-layer board; ensures reliable operation at full load in ambient up to +105°C with standard PCB copper area. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B radiated emissions - reduces need for external filtering in infotainment and cluster applications. |
Pinout & Package
LM43602QPWPTQ1 is housed in a thermally enhanced 16-pin HTSSOP (PWP) package measuring 6.6 mm × 5.1 mm × 1.2 mm, with exposed thermal pad (PAD) connected internally to AGND and serving as primary heat dissipation path to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | High-current connection to inductor; carries full switching waveform (0 V to VIN); requires low-inductance layout to minimize EMI and losses. |
| CBOOT (3) | Bootstrap supply | Connects 470 nF ceramic capacitor to SW; supplies gate drive voltage for high-side MOSFET; critical for stable 100% duty cycle capability. |
| VCC (4) | Internal LDO output | Bypassed with capacitor to AGND; powers internal circuitry; must not be externally loaded or shorted to ground during operation. |
| BIAS (5) | Optional LDO input | Improves efficiency when tied to VOUT (3.3–28 V) or external 3.3/5 V rail; bypassed with 1–10 µF capacitor; voltage must not exceed VIN. |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; enables synchronized operation across multiple converters to avoid beat frequencies. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open-circuit defaults to 500 kHz; tolerance impacts accuracy by ±10%. |
| PGOOD (8) | Power-good flag | Open-drain output asserting when VOUT is within ±12% of target; requires 10–100 kΩ pull-up; enables system sequencing and fault detection. |
| FB (9) | Feedback sense | Connects to resistor divider midpoint; regulates output using 1.015 V reference; leakage <65 nA minimizes divider error. |
| AGND (10) | Analog ground | Reference for FB, EN, SS/TRK, and internal references; must be star-connected to PGND near device to avoid noise coupling. |
| SS/TRK (11) | Soft-start / tracking | Internal 4.1 ms soft-start when floating; extended via external capacitor; accepts external ramp for output voltage tracking during power-up. |
| EN (12) | Enable control | Logic-level input with precision 2.2 V ±0.22 V turn-on threshold; supports UVLO programming via resistor divider from VIN. |
| VIN (13,14) | Main input supply | Connects to bulk and high-frequency input capacitors; dual pins reduce IR drop and improve thermal performance under 2 A load. |
| PGND (15,16) | Power ground | Low-side MOSFET source return; connects to CIN/COUT grounds and thermal pad; shortest possible trace required for EMI and efficiency. |
| PAD | Thermal pad | Internally connected to AGND; must be soldered to large PCB ground plane for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | 120 mΩ high-side + 65 mΩ low-side MOSFETs eliminate external diode losses and simplify BOM for compact 2 A solutions. |
| Internal compensation | Eliminates external Type II/III compensation network - reduces design time, component count, and layout sensitivity. |
| Light-load efficiency modes | Automatic DCM and PFM operation maintains >85% efficiency down to 1 mA load - critical for automotive always-on functions. |
| Pre-biased soft-start | Safe startup into pre-charged output capacitors prevents reverse current flow and system reset glitches. |
| EMI-optimized design | Controlled slew rates, optimized pinout, and integrated boot capacitor support meet EN55022 Class B without added filters. |
| Automotive qualification | AEC-Q100 Grade 2 (–40°C to +125°C ambient) with full thermal, ESD (±2 kV HBM), and reliability validation for safety-critical ECUs. |
Applications
| Automotive Sub-AM Band Power Rail | Industrial Point-of-Load Regulation |
|---|---|
|
Use Scenario: Powering radar sensor modules and camera ECU logic rails in 12 V vehicle architectures with cold-crank (4.5 V) and load-dump (42 V) transients. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing stable 3.3 V/5 V from unregulated battery input with hiccup-mode short-circuit protection. Use Value: 27 µA quiescent current extends battery life during vehicle sleep; EN pin precision UVLO prevents brownout resets during cranking. |
Use Scenario: Generating 5 V for PLC I/O modules and motor controller logic from 24 V industrial bus with high reliability requirements. IC Role / Device Role / Timing Role: High-efficiency step-down converter with thermal shutdown and power-good signaling for system health monitoring. Use Value: RθJA = 38.9°C/W enables full 2 A load at +85°C ambient without heatsink; PGOOD flag coordinates FPGA configuration sequencing. |
| Telecom System Bias Supply | General Purpose Wide-VIN Regulation |
|
Use Scenario: Providing isolated 3.3 V bias for optical transceivers and Ethernet PHYs in telecom base stations operating from –48 V DC input via intermediate 12 V rail. IC Role / Device Role / Timing Role: Secondary buck stage regulating intermediate rail with synchronization capability to avoid interference with data clock domains. Use Value: SYNC pin accepts external 1 MHz clock to align switching edges with system timing; meets CISPR 22 Class B for CE-marked equipment. |
Use Scenario: Universal input power solution for test equipment and portable instrumentation accepting 9–36 V DC inputs across global markets. IC Role / Device Role / Timing Role: Flexible buck converter supporting adjustable VOUT (via FB divider), frequency (RT), and soft-start (SS/TRK) for rapid prototyping. Use Value: Internal soft-start (4.1 ms) and tracking capability enable seamless integration into multi-rail systems; stable with ceramic, tantalum, or polymer output caps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43603QPWPTQ1 | 3 A output current, identical pinout and feature set; higher RDS(on) (HS: 85 mΩ, LS: 45 mΩ) and slightly higher IQ (32 µA). | Suitable where future-proofing for higher load or margin is required; same PCB layout but higher thermal dissipation at full load. | Select LM43603QPWPTQ1 if system load may scale beyond 2 A; no layout change needed due to pin-to-pin compatibility. |
| LM46002QPWPTQ1 | 2 A rating, 3.5–65 V input range, lower IQ (15 µA), but no PGOOD or SYNC; different pinout (no RT, SS/TRK, or BIAS pins). | Better suited for ultra-low-IQ battery-powered applications where sequencing and synchronization are unnecessary. | Choose LM46002QPWPTQ1 only for cost-sensitive, low-power automotive sensors - requires new layout and firmware adaptation. |
Compared with LM43603QPWPTQ1 and LM46002QPWPTQ1, the LM43602QPWPTQ1 uniquely balances 2 A capability, comprehensive feature set (PGOOD, SYNC, BIAS, RT, SS/TRK), and AEC-Q100 Grade 2 qualification in a thermally optimized HTSSOP package - making it optimal for mid-complexity automotive and industrial buck applications requiring flexibility and reliability.
Availability
LM43602QPWPTQ1 is available at Aetrix Electronics and suitable for automotive sub-AM band power rails, industrial PLC I/O modules, and telecom bias supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LM43602QPWPTQ1 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 technologies, with decades of automotive-grade product development and manufacturing excellence.
The LM43602QPWPTQ1 belongs to TI's automotive-qualified SIMPLE SWITCHER® power converter family, designed specifically for robust, easy-to-use DC-DC regulation in harsh environments including engine control units, ADAS cameras, and body electronics.
FAQ
What is the absolute maximum input voltage rating for the LM43602QPWPTQ1?
The LM43602QPWPTQ1 has an absolute maximum input voltage of 42 V across VIN to PGND, as specified in Section 6.1 of the datasheet. This rating accommodates automotive load-dump transients per ISO 7637-2. Operation above 36 V (recommended max) is permitted only for transient events ≤200 ms and must remain within the 42 V limit to prevent permanent damage.
Does the LM43602QPWPTQ1 require external compensation components?
No, the LM43602QPWPTQ1 features internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces bill-of-materials count, and improves layout robustness - confirmed in Sections 7.1 and 7.3.1 of the datasheet and verified in typical application schematics.
How does the BIAS pin improve efficiency in the LM43602QPWPTQ1?
The BIAS pin on the LM43602QPWPTQ1 allows connection to VOUT (for 3.3–28 V outputs) or an external 3.3/5 V rail, enabling the internal LDO to operate more efficiently than from VIN. This reduces power dissipation in the bias circuit, lowering total quiescent current - especially beneficial in high-input-voltage applications like 24 V industrial systems.
Can the LM43602QPWPTQ1 start up into a pre-biased output?
Yes, the LM43602QPWPTQ1 supports soft-start into a pre-biased output, preventing reverse current flow and potential system instability. This behavior is enabled by default and documented in Section 7.3.10 (Soft-Start) and Figure 34 of the datasheet, confirming safe operation when VOUT is already charged at startup.
What thermal performance can be expected from the LM43602QPWPTQ1 in a standard 4-layer PCB?
On a JEDEC-standard 4-layer board, the LM43602QPWPTQ1 achieves RθJA = 38.9°C/W (Section 6.4). At 2 A load and 12 V input, typical power dissipation is ~0.4 W, resulting in ~15.6°C junction-to-ambient rise - well within the +125°C max junction limit even at +105°C ambient, provided the thermal pad is properly soldered to the ground plane.
LM43602QPWPTQ1 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:
- 2A
- 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
LM43602QPWPTQ1 FAQ
1.How can I place an order for LM43602QPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43602QPWPTQ1 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 LM43602QPWPTQ1 reliable?
The price and inventory of LM43602QPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43602QPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM43602QPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43602QPWPTQ1 transactions.
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4.How is shipping managed for LM43602QPWPTQ1?
LM43602QPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43602QPWPTQ1 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 LM43602QPWPTQ1?
For technical support, including LM43602QPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43602QPWPTQ1 requirements.
6.How does Aetrix verify that LM43602QPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM43602QPWPTQ1 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 LM43602QPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM43602QPWPTQ1?
All LM43602QPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43602QPWPTQ1, 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 LM43602QPWPTQ1 part is unused and in its original packaging.
Return procedure for LM43602QPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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