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Texas Instruments LM62435APPQRJRRQ1
- Part No.:
- LM62435APPQRJRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LM62435APPQRJRRQ1.pdf
- Description:
- IC REG BUCK ADJ 3.5A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,740
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Product details
Overview
LM62435APPQRJRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC-DC converter delivering up to 3.5 A output current across a 3 V–36 V input range, with 42 V load dump tolerance, ±1% total output regulation accuracy, and adjustable switching frequency from 200 kHz to 2.2 MHz. It powers infotainment head units and ADAS domain controllers requiring low EMI and high reliability.
For engineers reviewing the LM62435APPQRJRRQ1 datasheet, LM62435APPQRJRRQ1 pinout, LM62435APPQRJRRQ1 application, or LM62435APPQRJRRQ1 equivalent, key selection criteria include spread-spectrum EMI reduction, adjustable SW node rise time, FPWM mode for constant-frequency light-load operation, and integrated high-side/low-side MOSFETs with 41 mΩ/21 mΩ RDS(on).
Technical Context
The LM62435APPQRJRRQ1 implements peak-current-mode control with pseudo-random spread spectrum, frequency foldback in Auto mode, and soft recovery from dropout to eliminate output overshoot. Its dual-VIN architecture (VIN1/VIN2) and parallel input path minimize parasitic inductance and switch-node ringing.
It integrates a 3.3 V internal LDO (VCC), supports external bias for efficiency optimization, and features a precision enable input with 1.263 V threshold and 24–32% hysteresis. The MODE/SYNC pin enables pin-selectable FPWM, synchronization to external clocks, and spread-spectrum activation via resistor programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V operating; withstands 42 V load dump for 400 ms - enables direct battery connection without external TVS. |
| Output Current | Up to 3.5 A continuous - supports power rails for automotive display processors and radar SoCs. |
| Switching Frequency | Adjustable 200 kHz–2.2 MHz; factory-set to 2.1 MHz - allows AM-band avoidance and compact magnetics. |
| Output Accuracy | ±1% total regulation - ensures stable voltage for sensitive analog sensors and SerDes interfaces. |
| Quiescent Current | 7 µA at no load (13.5 VIN, 3.3 VOUT) - extends battery life in always-on vehicle modules. |
| RDS(on) | High-side: 41 mΩ typ; low-side: 21 mΩ typ - minimizes conduction loss and thermal stress at full load. |
| EMI Optimization | HotRod™ VQFN-HR package, spread spectrum, adjustable SW rise time - meets CISPR-25 Class 5 without shielding. |
Pinout & Package
VQFN-HR (14-pin) package, 4.00 mm × 3.50 mm body size, exposed thermal pad for enhanced PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal LDO input | Connects to output rail to improve efficiency; capacitor to AGND improves noise immunity; ground if VOUT > 12 V. |
| VCC (2) | Internal LDO output | Supplies internal control circuitry; requires 1-µF capacitor to AGND; no external loading permitted. |
| AGND (3) | Analog reference ground | Reference point for FB and VCC; must be tied to both PGND1 and PGND2 on PCB for stability. |
| FB (4) | Feedback input | Connects to output sense point (fixed 3.3 V/5 V) or divider tap (adjustable); not floatable. |
| PGOOD (5) | Open-drain status output | Indicates regulation status; pulls low during fault or EN = low; requires external pull-up resistor. |
| MODE/SYNC (6) | Mode control & sync input | Selects Auto/FPWM mode, enables spread spectrum, or accepts external clock; resistor-programmable. |
| EN (7) | Enable input | Precision UVLO-capable input; 1.263 V threshold with 24–32% hysteresis; supports adjustable turn-on. |
| VIN1 (8), VIN2 (12) | Dual input power pins | Parallel paths reduce input loop inductance; each requires local high-quality bypass capacitors to respective PGND. |
| PGND1 (9), PGND2 (11) | Power ground terminals | Low-impedance return paths for low-side MOSFET; must be connected together and to system ground. |
| SW (10) | Switch node | Connects to output inductor; high dv/dt node requiring tight layout; drives CBOOT via internal diode. |
| RBOOT (13) | Rise-time control | Resistor between RBOOT and CBOOT sets SW node rise time (2.15 ns to 2.7 ns); optimizes EMI vs. efficiency trade-off. |
| CBOOT (14) | Bootstrap supply | Charged via internal diode from VCC when SW is low; requires 100-nF capacitor to SW for high-side gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +150°C TJ) - validated for under-hood and cockpit environments. |
| Ultra-low EMI architecture | HotRod™ package + parallel VIN paths + spread spectrum + adjustable SW rise time - eliminates need for metal shielding. |
| Light-load efficiency | 7 µA no-load IQ; 83% PFM efficiency at 1 mA - critical for always-on telematics and gateway modules. |
| Flexible output configuration | VOUT adjustable from 1 V to 95% of VIN; factory-trimmed 3.3 V and 5 V options - simplifies BOM across platforms. |
| Robust protection suite | Thermal shutdown (158–180°C), hiccup-mode overcurrent, PGOOD monitoring, and 42 V load dump tolerance - reduces external protection components. |
Applications
| Infotainment Head Unit Power | ADAS Radar Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and USB-C PD controller in automotive head units with strict EMC limits. IC Role / Device Role / Timing Role: Primary 5 V/3.3 V buck regulator delivering 3.5 A with <2.2 MHz switching to avoid AM band interference. Use Value: Spread spectrum and HotRod™ packaging meet CISPR-25 Class 5 without shielded inductors or ferrite beads. |
Use Scenario: Supplies 3.3 V to millimeter-wave radar transceivers requiring ultra-stable voltage and low noise. IC Role / Device Role / Timing Role: High-accuracy (±1%) synchronous buck with soft-dropout recovery to maintain radar lock during cold-crank. Use Value: ±1% regulation and 7 µA quiescent current ensure sensor uptime and battery longevity in parked mode. |
| Body Control Module (BCM) Core Rail | Automotive Gateway Processor Supply |
Use Scenario: Generates 5 V core rail for microcontrollers and CAN transceivers in door modules and lighting ECUs. IC Role / Device Role / Timing Role: Pin-compatible step-down converter supporting scalable designs across BCM variants. Use Value: Dual-VIN inputs and 42 V tolerance eliminate need for upstream TVS diodes during load dump events. |
Use Scenario: Provides 3.3 V supply to multi-core automotive gateway SoCs handling Ethernet AVB and CAN FD traffic. IC Role / Device Role / Timing Role: High-efficiency buck with external bias option to sustain >93% efficiency at 3.5 A load. Use Value: External bias input and low RDS(on) reduce thermal rise, enabling compact 4-layer PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM62440QPWRQ1 | 4 A output, fixed 2.1 MHz fSW, identical pinout and package - higher current rating but no adjustable frequency. | Better suited for future-proofing where >3.5 A margin is required; lacks frequency tuning for EMI-sensitive bands. | Select LM62440QPWRQ1 when design requires headroom beyond 3.5 A and fixed-frequency operation is acceptable. |
| LM61460QPWRQ1 | 6 A output, adjustable fSW, same package - higher current and identical frequency flexibility but larger die size. | Used in high-power ADAS ECUs; thermal performance differs due to higher RDS(on) scaling and junction temperature derating. | Choose LM61460QPWRQ1 only when 6 A capability is mandatory; verify thermal layout against LM62435APPQRJRRQ1's 25°C/W EVM RθJA. |
Compared with LM62440QPWRQ1 and LM61460QPWRQ1, the LM62435APPQRJRRQ1 offers optimal balance of 3.5 A capability, 200 kHz–2.2 MHz adjustability, and minimal EMI footprint - making it ideal for space-constrained infotainment and mid-tier ADAS modules where cost and layout area are critical.
Availability
LM62435APPQRJRRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS domain controllers, and body electronics requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM62435APPQRJRRQ1 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 LM62435-Q1 product line delivers high-efficiency, low-EMI DC-DC conversion for automotive subsystems demanding AEC-Q100 Grade 1 reliability, functional safety readiness, and robust transient response.
FAQ
What is the maximum input voltage the LM62435APPQRJRRQ1 can withstand during automotive load dump?
The LM62435APPQRJRRQ1 supports 42 V input for durations up to 400 ms, meeting ISO 7637-2 Pulse 5a requirements for automotive load dump. This eliminates the need for external TVS diodes in most 12 V and 24 V battery architectures. The device maintains regulation and does not latch off during such events, ensuring uninterrupted operation of downstream circuits powered by the LM62435APPQRJRRQ1.
Does the LM62435APPQRJRRQ1 support adjustable output voltage, and what is the minimum programmable value?
Yes, the LM62435APPQRJRRQ1 supports adjustable output voltage from 1 V to 95% of VIN using an external resistor divider on the FB pin. The minimum output is strictly limited to 1 V - below this, regulation is not guaranteed per datasheet specifications. Factory-trimmed 3.3 V and 5 V fixed-output variants are also available, but the LM62435APPQRJRRQ1 itself is the adjustable version with full 1 V–VIN×0.95 range.
How does the MODE/SYNC pin configure spread spectrum and FPWM operation on the LM62435APPQRJRRQ1?
The MODE/SYNC pin on the LM62435APPQRJRRQ1 uses resistor-based voltage thresholds to select modes: connecting to AGND enables Auto mode (PFM/PWM transition), pulling to VIN via 6 kΩ enables spread spectrum, and pulling to VIN via 30 kΩ disables spread spectrum. A logic-high signal (>1.6 V) forces FPWM mode. These configurations are confirmed in Section 8.3.2 of the datasheet and do not require external clock sources unless synchronization is explicitly needed.
What thermal performance can be expected from the LM62435APPQRJRRQ1 in a typical 4-layer automotive PCB layout?
In a standard 4-layer JEDEC board, the LM62435APPQRJRRQ1 achieves RθJA = 25°C/W (EVM measurement) and RθJB = 19.2°C/W. With proper thermal pad soldering and 2 oz copper on inner layers, junction temperature rise remains within AEC-Q100 Grade 1 limits (<150°C) at 3.5 A output across –40°C to +105°C ambient. Layout guidelines in Section 11 of the datasheet specify minimum thermal via count and copper area for reliable operation.
Is the LM62435APPQRJRRQ1 pin-compatible with other devices in the LM624xx-Q1 family, and which ones?
Yes, the LM62435APPQRJRRQ1 is pin-compatible with the LM62440-Q1 (4 A) and LM61460-Q1 (6 A) in the same VQFN-HR 14-pin package. This enables scalable power design - users can upgrade current capability without changing PCB layout. However, note that LM62440-Q1 has fixed 2.1 MHz switching, while LM61460-Q1 retains adjustable frequency; both share identical pin functions and thermal pad geometry with the LM62435APPQRJRRQ1.
LM62435APPQRJRRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerVFQFN
- 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):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VQFN-HR (4x3.5)
LM62435APPQRJRRQ1 FAQ
1.How can I place an order for LM62435APPQRJRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM62435APPQRJRRQ1 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 LM62435APPQRJRRQ1 reliable?
The price and inventory of LM62435APPQRJRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM62435APPQRJRRQ1 is usually 5 days.
3.What payment methods are accepted for LM62435APPQRJRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM62435APPQRJRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM62435APPQRJRRQ1?
LM62435APPQRJRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM62435APPQRJRRQ1 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 LM62435APPQRJRRQ1?
For technical support, including LM62435APPQRJRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM62435APPQRJRRQ1 requirements.
6.How does Aetrix verify that LM62435APPQRJRRQ1 is sourced from the original manufacturer or authorized distributors?
All LM62435APPQRJRRQ1 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 LM62435APPQRJRRQ1 meets industry standards.
7.What is the process for return or replacement of LM62435APPQRJRRQ1?
All LM62435APPQRJRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM62435APPQRJRRQ1, 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 LM62435APPQRJRRQ1 part is unused and in its original packaging.
Return procedure for LM62435APPQRJRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM62435APPQRJRRQ1 Tags
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