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Texas Instruments LM43602QPWPRQ1
- Part No.:
- LM43602QPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43602QPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,685
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Product details
Overview
LM43602QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 2 automotive-qualified synchronous step-down DC-DC converter delivering up to 2 A output current across a 3.5 V to 36 V input range, featuring 27 µA quiescent current in regulation, internal compensation, and a default 500 kHz switching frequency. It integrates high-side and low-side MOSFETs (RDS(on) = 120 mΩ / 65 mΩ), supports soft-start into pre-biased loads, and provides power-good flag and precision enable for automotive sub-AM band power rails.
For engineers reviewing the LM43602QPWPRQ1 datasheet, LM43602QPWPRQ1 pinout, LM43602QPWPRQ1 application, or LM43602QPWPRQ1 equivalent, key selection criteria include its HTSSOP-16 package thermal performance (RθJA = 38.9°C/W), EN pin precision UVLO (2.2 V ±0.22 V), FB reference accuracy (1.015 V ±13 mV), and EMI-compliant operation meeting EN55022 Class B limits without external filtering.
Technical Context
The LM43602QPWPRQ1 employs fixed-frequency peak current mode control with automatic transition to DCM and PFM at light loads, enabling high efficiency across 0–2 A output. Its integrated synchronous rectification eliminates external diode losses, while internal compensation reduces loop stability design effort.
It features programmable switching frequency (200 kHz–2.2 MHz) via RT pin, external clock synchronization capability, and robust protection including cycle-by-cycle current limiting (HS peak limit = 4.5 A typ), hiccup-mode short-circuit response, and thermal shutdown at 160°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide automotive battery transients (cold crank, load dump) without external pre-regulation. |
| Output Current | Up to 2 A continuous - sufficient for powering infotainment SoCs, ADAS sensors, and body control modules. |
| Quiescent Current | 27 µA in regulation - enables always-on systems (e.g., telematics, gateway ECUs) to meet <100 µA sleep budget. |
| Feedback Reference | 1.015 V ±13 mV - enables precise output voltage setting (e.g., 3.3 V ±1%) with standard resistor tolerances. |
| Switching Frequency | Default 500 kHz, adjustable 200 kHz–2.2 MHz - balances efficiency (lower fSW) vs. size (higher fSW) per board constraints. |
| Thermal Resistance | RθJA = 38.9°C/W - allows 2 A operation at +85°C ambient with minimal copper area on 4-layer PCB. |
| EMI Compliance | Meets EN55022 Class B radiated emissions - reduces need for ferrite beads or shielding in automotive cabin modules. |
Pinout & Package
LM43602QPWPRQ1 is housed in a thermally enhanced HTSSOP-16 (PWP) package measuring 6.6 mm × 5.1 mm × 1.2 mm, with exposed thermal pad (PAD) tied to AGND/PGND for efficient heat dissipation. The 16-pin leaded package supports automated optical inspection and reflow soldering per J-STD-020.
| 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 turn-on. |
| VCC (4) | Internal LDO output | Bypassed to AGND; powers internal circuitry - no external loading permitted to avoid regulation failure. |
| BIAS (5) | Optional LDO input | Improves efficiency when tied to VOUT (3.3–28 V) or external rail; must not exceed VIN to prevent damage. |
| SYNC (6) | External clock input | Enables synchronization to system clock (200 kHz–2.2 MHz); requires proper high-speed termination to suppress ringing. |
| RT (7) | Frequency programming | Resistor to AGND sets fSW; open circuit defaults to 500 kHz - enables noise-sensitive timing alignment. |
| PGOOD (8) | Open-drain power-good flag | Signals valid VOUT (±13% FB threshold); requires 10–100 kΩ pull-up to logic rail ≤12 V for sequenced power-up. |
| FB (9) | Feedback sense input | Monitors resistive divider output; 1.015 V reference enables accurate output regulation with minimal offset error. |
| AGND (10) | Analog ground reference | Reference for internal references and comparators - must be connected to clean system ground plane, separate from PGND if possible. |
| SS/TRK (11) | Soft-start/tracking control | Internal 4.1 ms soft-start when floating; external capacitor extends ramp time; voltage injection enables output tracking. |
| EN (12) | Enable input | Logic-level control (2.2 V threshold) for system-level UVLO; supports resistor-divider biasing from VIN or external controller. |
| VIN (13,14) | Main input supply | High-current path for input capacitors - requires low-ESR CIN placed close to pins with minimal trace inductance. |
| PGND (15,16) | Power ground return | Low-side FET source connection - must tie directly to CIN, COUT, and thermal PAD for optimal thermal and EMI performance. |
| PAD | Exposed thermal pad | Primary heat dissipation path - must be soldered to solid ground plane with ≥6 thermal vias for RθJA compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | Eliminates external Schottky diode, reducing solution size by >30% and improving full-load efficiency by ~3% vs. asynchronous designs. |
| Internal compensation | Removes need for external Type II/III compensation network - cuts BOM count by 4–6 components and accelerates prototype validation. |
| Pre-biased soft-start | Allows safe startup into powered downstream circuits (e.g., FPGA banks, memory rails) without reverse current or latch-up risk. |
| EMI-optimized switching | Controlled slew rates and optimized pinout reduce radiated emissions - meets Class B limits at 500 kHz without snubbers or shielding. |
| Automotive-grade reliability | AEC-Q100 Grade 2 qualification (–40°C to +125°C ambient) ensures operation in engine bay, head unit, and ADAS ECU environments. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and display interface in automotive head units with 12 V battery input. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 1.1 V, 1.8 V, and 3.3 V rails with tight transient response. Use Value: 27 µA quiescent current enables low-power audio standby mode; PFM mode maintains >85% efficiency at 10 mA load. |
Use Scenario: Supplies image sensor, ISP, and MIPI transmitter in rear-view or surround-view camera ECU. IC Role / Device Role / Timing Role: Point-of-load regulator delivering 1.2 V @ 1.5 A with fast load-step response (<50 µs settling). Use Value: Internal soft-start prevents inrush current during hot-plug camera insertion; PGOOD enables safe sensor initialization sequence. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
|
Use Scenario: Regulates power for microcontroller, CAN transceivers, and LED drivers in door modules and lighting controllers. IC Role / Device Role / Timing Role: Wide-VIN buck converter supporting cold-crank (4.5 V) to load-dump (36 V) conditions. Use Value: 36 V absolute max rating and hiccup-mode short-circuit protection ensure robustness against wiring faults and ESD events. |
Use Scenario: Provides always-on 3.3 V rail for cellular modem, GNSS receiver, and secure element in vehicle connectivity units. IC Role / Device Role / Timing Role: Low-IQ regulator enabling <100 µA system sleep current for LTE/NB-IoT deep-sleep modes. Use Value: Precision enable (2.2 V threshold) allows direct connection to MCU GPIO for controlled wake-up; BIAS pin improves light-load efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43603QPWPRQ1 | 3 A output current, identical pinout and feature set; higher RDS(on) (HS: 90 mΩ, LS: 45 mΩ) but same thermal footprint. | Suitable for higher-current ADAS domain controllers or multi-rail power trees requiring margin. | Select when >2 A sustained load or future-proofing for higher-power derivatives is required; no PCB change needed. |
| TPS54360BQDDAQ1 | 3.5–60 V input, 3.5 A output; external compensation, no integrated BIAS pin; higher IQ (146 µA). | Better suited for 48 V mild-hybrid systems or industrial applications beyond automotive temperature range. | Choose for extended input range or where external loop tuning is preferred; requires redesign of compensation and layout. |
Compared with LM43603QPWPRQ1, the LM43602QPWPRQ1 offers lower cost and optimized thermal performance at 2 A, while the TPS54360BQDDAQ1 trades off quiescent current and integration for wider VIN and higher current - making LM43602QPWPRQ1 ideal for cost- and space-constrained automotive sub-AM band applications.
Availability
LM43602QPWPRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control modules requiring stable component supply under AEC-Q100 qualification and long-term production support.
Supply support for LM43602QPWPRQ1 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 and embedded processing technologies, with decades of automotive IC design expertise and ISO/TS 16949-certified manufacturing.
The LM43602-Q1 product line delivers compact, high-efficiency synchronous buck regulators specifically engineered for automotive subsystems operating across harsh battery voltage ranges and temperature extremes.
FAQ
What is the maximum input voltage rating for LM43602QPWPRQ1?
The LM43602QPWPRQ1 has an absolute maximum input voltage rating of 42 V, with recommended operating input range from 3.5 V to 36 V. This allows it to withstand automotive load-dump transients (up to 40 V per ISO 7637-2 Pulse 5a) while maintaining regulation across cold-crank conditions down to 3.5 V. Operation above 36 V is permissible only for transient events within specified duration limits defined in the datasheet.
Does LM43602QPWPRQ1 require external compensation components?
No, the LM43602QPWPRQ1 features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This reduces bill-of-materials count by up to six passive components and simplifies PCB layout - particularly beneficial for space-constrained automotive modules where layout parasitics can destabilize externally compensated loops.
How does the BIAS pin improve efficiency in LM43602QPWPRQ1?
The BIAS pin on LM43602QPWPRQ1 allows connection to VOUT (for 3.3–28 V outputs) or an external 3.3 V/5 V rail, bypassing the internal VCC LDO. This reduces power loss in the bias supply path, lowering total quiescent current by up to 50% at light loads - critical for meeting automotive "always-on" sleep current budgets below 100 µA.
Can LM43602QPWPRQ1 synchronize to an external clock signal?
Yes, LM43602QPWPRQ1 supports external clock synchronization via the SYNC pin, accepting TTL/CMOS-compatible signals from 200 kHz to 2.2 MHz. This enables noise-sensitive systems (e.g., radar receivers, audio amplifiers) to align switching edges away from critical frequency bands, reducing beat frequencies and easing EMI filter design.
What thermal management provisions are built into the LM43602QPWPRQ1 package?
The LM43602QPWPRQ1 uses an HTSSOP-16 (PWP) package with an exposed thermal pad (PAD) that serves as the primary heat dissipation path. When soldered to a 4-layer PCB with ≥6 thermal vias connecting to inner ground planes, it achieves RθJA = 38.9°C/W - enabling 2 A continuous operation at +85°C ambient without forced airflow or heatsinks.
LM43602QPWPRQ1 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
LM43602QPWPRQ1 FAQ
1.How can I place an order for LM43602QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43602QPWPRQ1 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 LM43602QPWPRQ1 reliable?
The price and inventory of LM43602QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43602QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM43602QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43602QPWPRQ1 transactions.
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4.How is shipping managed for LM43602QPWPRQ1?
LM43602QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43602QPWPRQ1 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 LM43602QPWPRQ1?
For technical support, including LM43602QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43602QPWPRQ1 requirements.
6.How does Aetrix verify that LM43602QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM43602QPWPRQ1 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 LM43602QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM43602QPWPRQ1?
All LM43602QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43602QPWPRQ1, 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 LM43602QPWPRQ1 part is unused and in its original packaging.
Return procedure for LM43602QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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