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Texas Instruments LM46002QPWPRQ1
- Part No.:
- LM46002QPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46002QPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,118
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Product details
Overview
LM46002QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC-DC converter delivering up to 2 A output current across a 3.5 V to 60 V input range, featuring 27 µA quiescent current in regulation, adjustable switching frequency (200 kHz–2.2 MHz), and integrated power-good flag. It serves as the primary voltage regulator in automotive sub-AM band 12-V/24-V systems.
For engineers reviewing the LM46002QPWPRQ1 datasheet, LM46002QPWPRQ1 pinout, LM46002QPWPRQ1 application, or LM46002QPWPRQ1 equivalent, key selection considerations include its wide VIN capability, PFM/DCM light-load efficiency mode, EN-controlled precision UVLO (2.1 V typical), thermal shutdown at 160°C, and HTSSOP-16 package with exposed thermal pad for automotive-grade thermal management.
Technical Context
The LM46002QPWPRQ1 uses peak-current-mode control with internal compensation, enabling stable operation with ceramic, polymer, tantalum, or aluminum output capacitors without external loop components. Its architecture integrates high-side (210 mΩ) and low-side (110 mΩ) MOSFETs, a 1.011 V ±1% feedback reference, and cycle-by-cycle current limiting with hiccup-mode short-circuit protection.
It supports frequency synchronization via the SYNC pin (2–5.5 V logic levels), programmable soft-start via SS/TRK (internal 4.1 ms or capacitor-extended), and output voltage tracking. The BIAS pin enables efficiency optimization by connecting to VOUT (3.3–28 V) or an external rail, while the PGOOD open-drain flag provides 80–113% FB threshold detection with 6% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports direct connection to automotive battery rails including cold-crank (≥3.5 V start-up) and load-dump transients. |
| Output Current | Up to 2 A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in automotive ECUs. |
| Quiescent Current | 27 µA in regulation - enables always-on functionality in vehicle body control modules without excessive battery drain. |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) - allows EMI optimization and compact magnetics; RT pin sets frequency with resistor. |
| Feedback Reference | 1.011 V ±1.2% over –40°C to +125°C - ensures precise output voltage accuracy across automotive temperature range. |
| Thermal Protection | Junction shutdown at 160°C with 150°C recovery - prevents damage during sustained overload or poor heatsinking in enclosed enclosures. |
| EMI Compliance | Tested to EN55022/CISPR 22 Class B - meets radiated and conducted emission limits for automotive infotainment and ADAS subsystems. |
Pinout & Package
LM46002QPWPRQ1 is housed in a 16-pin HTSSOP (PWP) package (6.6 mm × 5.1 mm × 1.2 mm, 0.65 mm pitch) with an exposed thermal pad (PAD) connected internally to AGND and PGND for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Power switch node | Connects to inductor; carries high di/dt switching current; requires tight layout to minimize EMI and voltage spikes. |
| 3 CBOOT | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; requires 470-nF ceramic capacitor between CBOOT and SW. |
| 4 VCC | Internal LDO bias supply | Bypass with capacitor to AGND; no external loading permitted; powers internal circuitry when VIN ≥3.8 V. |
| 5 BIAS | Optional LDO input | Tie to VOUT (3.3–28 V) or external 3.3/5 V rail to improve efficiency; bypass with 1–10 µF capacitor if used. |
| 6 SYNC | Frequency synchronization input | Accepts external clock (200 kHz–2.2 MHz); requires proper high-speed termination; ground if unused. |
| 7 RT | Frequency programming | Resistor to AGND sets switching frequency; floating = 500 kHz default; 1% tolerance recommended. |
| 8 PGOOD | Open-drain power-good flag | Signals valid VOUT (80–113% of FB setpoint); requires 10–100 kΩ pull-up to ≤12 V logic rail. |
| 9 FB | Feedback voltage sense | Monitors resistive divider midpoint; 1.011 V reference sets VOUT = 1.011 × (1 + RFBT/RFBB); avoid grounding. |
| 10 AGND | Analog ground reference | Ground for internal references and logic; connect directly to system ground plane with low-impedance path. |
| 11 SS/TRK | Soft-start / tracking control | Internal soft-start (4.1 ms) when floating; capacitor extends ramp time; external ramp enables output tracking. |
| 12 EN | Enable input with precision UVLO | Active-high; 2.1 V typical enable threshold; hysteresis prevents chatter near trip point; do not float. |
| 13, 14 VIN | Main power input | Connects to input capacitor (CIN); dual pins reduce IR drop and improve high-frequency decoupling. |
| 15, 16 PGND | Power ground return | Low-side FET source return; tie to AGND, PAD, and CIN/COUT grounds; shortest possible PCB trace required. |
| PAD | Exposed thermal pad | Internally connected to AGND and PGND; must be soldered to large copper pour for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) - validated for under-hood and cabin-mounted automotive electronics. |
| Synchronous rectification | Integrated 210 mΩ HS / 110 mΩ LS MOSFETs - eliminates external Schottky losses, improves full-load efficiency by ~5% vs. asynchronous designs. |
| Light-load efficiency mode | Automatic DCM and PFM operation - maintains >85% efficiency at 1 mA load, critical for always-on vehicle modules. |
| Pre-biased soft-start | Safe startup into pre-charged output - prevents reverse current flow and protects downstream circuitry during hot-plug events. |
| Output short-circuit protection | Hiccup-mode current limiting - cycles on/off after fault detection (32 cycles, 5.5 ms retry delay) to limit power dissipation and prevent thermal runaway. |
| Stable with diverse capacitors | No ESR requirement - supports low-ESR ceramic, polymer, tantalum, and aluminum electrolytic output caps without compensation changes. |
Applications
| Automotive Body Control Module (BCM) | Commercial Vehicle Telematics Unit |
|---|---|
Use Scenario: Regulates 12 V battery input to 3.3 V/5 V for MCU, LIN transceivers, and door lock actuators in passenger vehicles. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, low-noise, thermally robust power domain with PGOOD sequencing. Use Value: 27 µA IQ enables <10 µA system standby current; AEC-Q100 Grade 1 ensures reliability across thermal cycling and vibration. |
Use Scenario: Powers GPS, cellular modem, and CAN FD gateway in heavy-duty truck telematics boxes exposed to 24 V nominal + load dump. IC Role / Device Role / Timing Role: Wide-VIN step-down converter with hiccup-mode fault protection and EN-controlled wake-up for remote diagnostics. Use Value: 60 V absolute max rating withstands 40 V load dump transients; SYNC pin enables spread-spectrum EMI reduction in dense PCB layouts. |
| Industrial Motor Drive I/O Module | Railway Signaling Power Supply |
Use Scenario: Supplies 5 V to isolated digital I/O, encoder interfaces, and safety relays in motor control cabinets with 24–48 V DC bus. IC Role / Device Role / Timing Role: Point-of-load regulator with precision enable (2.1 V threshold) for controlled power-up sequencing with PLC backplane logic. Use Value: Adjustable frequency avoids noise coupling into analog sensor circuits; SS/TRK pin enables synchronized startup with other rails. |
Use Scenario: Converts 72 V or 110 V DC traction battery to 12 V for LED signal lamps, microcontroller, and watchdog timers in rail signaling cabinets. IC Role / Device Role / Timing Role: High-input-voltage buck converter with thermal shutdown and PGOOD monitoring for SIL-2 functional safety compliance. Use Value: 160°C junction shutdown and 150°C recovery provide margin for sealed enclosures; EN hysteresis prevents false resets during voltage sags. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM46002AQPWPRQ1 | Optimized for PFM operation; lower light-load IQ (typical 22 µA vs. 27 µA); identical pinout and specs otherwise. | Better suited for battery-backed always-on nodes where sub-mA idle current is critical. | Select LM46002AQPWPRQ1 for new designs prioritizing ultra-low IQ; LM46002QPWPRQ1 remains valid for legacy compatibility. |
| LM61480QRNXTQ1 | Higher 8-A output, 3.5–60 V input, 2.1-MHz max frequency; QFN-16 package; different pinout and compensation scheme. | Targets higher-power domains (e.g., ADAS camera modules); requires full schematic/layout redesign. | Choose LM61480QRNXTQ1 only when >2 A output or smaller solution size is required; not a drop-in replacement. |
Compared with LM46002AQPWPRQ1, the LM46002QPWPRQ1 trades 5 µA higher light-load IQ for broader design familiarity and legacy validation; versus LM61480QRNXTQ1, it offers proven 2-A performance in a mature, cost-optimized HTSSOP package without requiring layout rework.
Availability
LM46002QPWPRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, commercial vehicle telematics units, and industrial motor drive I/O modules requiring stable component supply with AEC-Q100 qualification and long-term production support.
Supply support for LM46002QPWPRQ1 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 ICs, with decades of experience in power management innovation and automotive qualification.
The LM46002QPWPRQ1 belongs to TI's automotive-grade DC-DC converter family designed specifically for demanding vehicle subsystems-emphasizing wide input range, low quiescent current, EMI robustness, and AEC-Q100 reliability from the outset.
FAQ
What is the minimum input voltage required for the LM46002QPWPRQ1 to start switching?
The LM46002QPWPRQ1 requires a minimum input voltage of 3.8 V to initiate startup and enter regulation. Below this threshold, the device remains in shutdown with only 2.3–5 µA quiescent current drawn. This ensures reliable operation during automotive cold-crank conditions where battery voltage may dip transiently but recover above 3.8 V.
Can the LM46002QPWPRQ1 operate with an output voltage lower than 1 V?
No-the LM46002QPWPRQ1 has a guaranteed minimum output voltage of 1 V, defined by its 1.011 V feedback reference and practical resistor-divider limitations. Attempting to set VOUT below 1 V violates the device's electrical specifications and risks instability or inaccurate regulation due to FB pin leakage and reference tolerance effects.
How does the BIAS pin improve efficiency in the LM46002QPWPRQ1?
When the BIAS pin is tied to VOUT (3.3–28 V), the LM46002QPWPRQ1 powers its internal circuitry from the regulated output instead of VIN, reducing input current draw and associated I²R losses-especially beneficial at high VIN-to-VOUT ratios (e.g., 48 V → 3.3 V). This configuration lowers total operating IQ by up to 30% compared to VCC-only operation.
Is the LM46002QPWPRQ1 pin-compatible with the LM43602QPWPRQ1?
Yes-the LM46002QPWPRQ1 is explicitly stated as pin-to-pin compatible with the LM4360x and LM4600x families in the same HTSSOP-16 package. This allows direct substitution in existing designs using those converters, provided the input voltage range (LM43602 supports up to 36 V) and output current requirements align.
What is the purpose of the exposed thermal pad (PAD) on the LM46002QPWPRQ1 package?
The exposed thermal pad on the LM46002QPWPRQ1 serves as the primary heat conduction path from the die to the PCB ground plane. It is electrically connected to AGND and PGND internally, so it must be soldered to a large, low-thermal-resistance copper area-ideally with multiple thermal vias-to maintain junction temperature below 125°C under 2-A load at +85°C ambient.
LM46002QPWPRQ1 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):
- 60V
- 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
LM46002QPWPRQ1 FAQ
1.How can I place an order for LM46002QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46002QPWPRQ1 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 LM46002QPWPRQ1 reliable?
The price and inventory of LM46002QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46002QPWPRQ1 is usually 5 days.
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4.How is shipping managed for LM46002QPWPRQ1?
LM46002QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46002QPWPRQ1 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 LM46002QPWPRQ1?
For technical support, including LM46002QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46002QPWPRQ1 requirements.
6.How does Aetrix verify that LM46002QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM46002QPWPRQ1 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 LM46002QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM46002QPWPRQ1?
All LM46002QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46002QPWPRQ1, 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 LM46002QPWPRQ1 part is unused and in its original packaging.
Return procedure for LM46002QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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