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Texas Instruments LM43602AQPWPTQ1
- Part No.:
- LM43602AQPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43602AQPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LM43602AQPWPTQ1 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 500 kHz default switching frequency. It serves as the primary voltage regulator in automotive sub-AM band power rails, enabling compact, high-efficiency point-of-load conversion.
For engineers reviewing the LM43602AQPWPTQ1 datasheet, LM43602AQPWPTQ1 pinout, LM43602AQPWPTQ1 application, or LM43602AQPWPTQ1 equivalent, key selection criteria include its PFM/DCM light-load efficiency mode, precision enable with 2.2 V threshold, power-good flag with 6% hysteresis, and HTSSOP-16 thermal performance (RθJA = 38.9°C/W).
Technical Context
The LM43602AQPWPTQ1 employs fixed-frequency peak current mode control with automatic transition into discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) at light loads-enabling >90% efficiency down to 1 mA. Its integrated high-side (120 mΩ) and low-side (65 mΩ) MOSFETs, internal 1.015 V feedback reference, and programmable soft-start (4.1 ms default) support robust transient response and pre-biased startup.
Thermal management is enabled via the exposed thermal pad (connected to AGND/PGND), while EMI compliance is achieved through optimized pin layout, integrated boot-strapping, and EN55022 Class B–certified radiated emissions performance. Frequency synchronization (200 kHz–2.2 MHz) and external RT resistor programming allow system-level noise avoidance.
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 | 2 A continuous - sufficient for powering ADAS sensors, infotainment SoCs, or body control modules. |
| Quiescent Current | 27 µA in regulation - enables always-on subsystems (e.g., CAN wake-up receivers) with minimal battery drain. |
| Feedback Reference | 1.015 V ±13 mV (–40°C to +125°C) - ensures <±1% output accuracy over full automotive temperature range. |
| Switching Frequency | 500 kHz default, adjustable 200 kHz–2.2 MHz - balances PCB size (higher fSW) vs. efficiency (lower fSW) per design need. |
| Power-Good Flag | Open-drain PGOOD with 113% OV / 88% UV thresholds and 6% hysteresis - provides reliable rail sequencing and fault detection. |
| Enable Threshold | 2.2 V rising, 1.93 V falling (290 mV hysteresis) - allows precise system-level undervoltage lockout (UVLO) programming. |
Pinout & Package
LM43602AQPWPTQ1 is housed in a thermally enhanced HTSSOP-16 (PWP) package (6.6 mm × 5.1 mm × 1.2 mm) with an exposed thermal pad connected internally to AGND/PGND - requiring direct PCB copper connection for effective heat dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | High-current path connecting internal HS/LS FETs to external inductor; requires short, low-inductance routing. |
| CBOOT (3) | Bootstrap capacitor terminal | Connects 470 nF ceramic cap to SW; critical for high-side gate drive integrity and duty cycle stability. |
| VCC (4) | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; supplies bias for control circuitry - no external loading permitted. |
| BIAS (5) | Optional LDO input | Tie to VOUT (if 3.3–28 V) or external 3.3/5 V rail to reduce VIN current draw and improve light-load efficiency. |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; enables synchronized multi-rail systems and EMI frequency steering. |
| RT (7) | Frequency set resistor | Connect resistor to AGND to program fSW; open-circuit defaults to 500 kHz - eliminates timing component tolerance drift. |
| PGOOD (8) | Power-good flag | Open-drain output with internal pulldown; requires external 10–100 kΩ pullup to logic rail ≤12 V for sequencing. |
| FB (9) | Feedback sense input | Connects to resistor divider midpoint; internal 1.015 V reference sets VOUT = 1.015 × (1 + RFBT/RFBB). |
| AGND (10) | Analog ground reference | Low-noise ground for internal references and error amplifier - must be star-connected to PGND near device. |
| SS/TRK (11) | Soft-start/tracking control | Internal 4.1 ms ramp when floating; add capacitor for extended ramp or connect to external ramp for supply tracking. |
| EN (12) | Enable input | Active-high logic; 2.2 V threshold enables precise UVLO - connect directly to VIN or via resistor divider for system control. |
| VIN (13,14) | Main input supply | Dual pins reduce IR drop and thermal stress; bypass with high-frequency ceramic cap placed adjacent to pins. |
| PGND (15,16) | Power ground return | Internal connection to LS FET source; tie to PCB ground plane, CIN/COUT grounds, and thermal pad. |
| PAD | Thermal pad | Exposed die attach pad - must be soldered to large copper area for thermal conduction and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 2 (–40°C to +125°C ambient) - validated for under-hood and cabin applications with full reliability testing. |
| Integrated synchronous FETs | 120 mΩ HS + 65 mΩ LS MOSFETs - eliminates external rectifier losses and reduces BOM count by two components. |
| EMI-compliant design | Meets EN55022 Class B radiated emissions - achieved via optimized pinout, internal boot diode, and spread-spectrum-ready architecture. |
| Pre-biased soft-start | Supports startup into pre-charged output capacitors - prevents reverse current flow and protects downstream loads during hot-plug events. |
| Short-circuit hiccup protection | Trips at 4.5 A peak inductor current, then enters 5.5 ms retry cycle - limits power dissipation during sustained faults without latch-off. |
| Stable with diverse output caps | Compatible with ceramic, polymer, tantalum, and aluminum electrolytic capacitors - simplifies sourcing and improves design flexibility. |
Applications
| Automotive Sub-AM Band Power | Industrial Wide-VIN Point-of-Load |
|---|---|
|
Use Scenario: Powering radar sensor modules, camera ECUs, or gateway controllers in 12 V/24 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 or 5 V rail with fast transient response and automotive-grade reliability. Use Value: Eliminates need for external TVS and pre-regulator stages due to 36 V max operating input and integrated overvoltage/overtemperature protection. |
Use Scenario: Converting unregulated industrial 24 V or 48 V bus to 5 V/3.3 V for PLC I/O modules, motor drives, or HMI displays operating in harsh environments. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC-DC converter supporting continuous 2 A load with minimal heatsinking. Use Value: Delivers >92% efficiency at 1 A (12 VIN → 3.3 VOUT) and maintains regulation down to 3.5 VIN, enabling brownout resilience. |
| Telecom Remote Radio Units | Automotive Infotainment Core Supply |
|
Use Scenario: Generating isolated 5 V bias for RF front-end amplifiers and ADCs in outdoor small-cell base stations powered from 48 V PoE or battery backup. IC Role / Device Role / Timing Role: Compact, low-noise buck converter with frequency synchronization capability to avoid interference with sensitive RF bands. Use Value: 200 kHz–2.2 MHz adjustable switching frequency enables EMI notch placement away from LTE/5G carrier frequencies. |
Use Scenario: Supplying core voltage to application processors (e.g., NXP i.MX8, TI Jacinto) in head units and digital clusters requiring tight output accuracy and sequencing. IC Role / Device Role / Timing Role: Precision-regulated buck stage with PGOOD flag and voltage tracking for coordinated multi-rail startup/shutdown. Use Value: Internal 1.015 V reference and 6% PGOOD hysteresis ensure ±1% output tolerance and reliable SoC reset signaling across temperature. |
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) but larger thermal footprint. | Suitable for higher-current automotive loads (e.g., display backlight drivers); requires same PCB layout but higher output capacitance. | Select when >2 A continuous load or higher peak surge current is required; retains full compatibility with LM43602AQPWPTQ1 layout and firmware. |
| TPS54360BQDDAQ1 | Non-synchronous buck (external diode), 3.5–60 V input, 3.5 A output; lacks PGOOD, tracking, and internal compensation. | Used where cost sensitivity outweighs efficiency needs; requires external compensation network and diode, increasing BOM and layout complexity. | Choose only if input voltage exceeds 36 V or budget constraints prohibit synchronous topology; not drop-in compatible due to different pin functions and compensation requirements. |
Compared with LM43603QPWPTQ1, LM43602AQPWPTQ1 offers lower solution size and thermal density for 2 A loads; versus TPS54360BQDDAQ1, it delivers superior light-load efficiency, reduced component count, and automotive-optimized protection features - making it the preferred choice for space-constrained, high-reliability 2 A applications.
Availability
LM43602AQPWPTQ1 is available at Aetrix Electronics and suitable for automotive sub-AM band power, industrial wide-VIN point-of-load regulation, and telecom remote radio unit designs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM43602AQPWPTQ1 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 rigorous AEC-Q100 qualification infrastructure.
The LM43602-Q1 product line delivers highly integrated, thermally optimized synchronous buck regulators targeting automotive and industrial applications demanding wide input range, low quiescent current, and robust fault protection - all in compact leaded packages.
FAQ
What is the maximum absolute input voltage rating for LM43602AQPWPTQ1?
The LM43602AQPWPTQ1 has an absolute maximum input voltage rating of 42 V across VIN to PGND. This rating accommodates automotive load-dump transients without damage. Operation above 36 V is not recommended for continuous use, as the device's recommended operating range is 3.5 V to 36 V. Exceeding 42 V risks permanent damage per the Absolute Maximum Ratings table in the datasheet.
Does LM43602AQPWPTQ1 support startup into a pre-biased output?
Yes, LM43602AQPWPTQ1 supports soft-start into a pre-biased output. Its internal soft-start circuitry prevents reverse current flow during startup by controlling the FB pin voltage ramp, even when the output capacitor is already charged. This capability is explicitly documented in the Features and Description sections of the datasheet and verified in typical application circuits.
How does the BIAS pin improve efficiency in LM43602AQPWPTQ1?
The BIAS pin on LM43602AQPWPTQ1 allows connection to VOUT (for 3.3–28 V outputs) or an external 3.3/5 V rail, enabling the internal LDO to draw bias current from that source instead of VIN. This reduces total input current draw and improves light-load efficiency - particularly valuable in always-on automotive subsystems where quiescent power is critical.
What is the thermal resistance (RθJA) of LM43602AQPWPTQ1 in its HTSSOP package?
The junction-to-ambient thermal resistance (RθJA) of LM43602AQPWPTQ1 in the PWP (HTSSOP-16) package is 38.9°C/W, measured on a standard 4-layer JEDEC board. This value assumes proper PCB layout with the exposed thermal pad fully soldered to a minimum 100 mm² copper area. Actual thermal performance improves with larger copper pours and internal ground planes.
Can LM43602AQPWPTQ1 be synchronized to an external clock, and what is the supported frequency range?
Yes, LM43602AQPWPTQ1 supports external clock synchronization via the SYNC pin across a 200 kHz to 2.2 MHz frequency range. The device accepts TTL/CMOS-compatible square waves with 10%–90% duty cycle and requires proper high-speed termination to prevent ringing. Synchronization enables noise-sensitive systems (e.g., radar, audio) to avoid critical frequency bands.
LM43602AQPWPTQ1 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:
- 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
LM43602AQPWPTQ1 FAQ
1.How can I place an order for LM43602AQPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43602AQPWPTQ1 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 LM43602AQPWPTQ1 reliable?
The price and inventory of LM43602AQPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43602AQPWPTQ1 is usually 5 days.
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Once your LM43602AQPWPTQ1 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 LM43602AQPWPTQ1?
For technical support, including LM43602AQPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43602AQPWPTQ1 requirements.
6.How does Aetrix verify that LM43602AQPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM43602AQPWPTQ1 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 LM43602AQPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM43602AQPWPTQ1?
All LM43602AQPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43602AQPWPTQ1, 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 LM43602AQPWPTQ1 part is unused and in its original packaging.
Return procedure for LM43602AQPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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