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Texas Instruments LM43602DSUT
- Part No.:
- LM43602DSUT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VFDFN Exposed Pad
- Datasheet:
-
LM43602DSUT.pdf
- Description:
- IC REG BUCK ADJ 2A 16SON
- Quantity:
- Payment:
- Shipping:
Inventory:430
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Product details
Overview
LM43602DSUT from Texas Instruments is a 3.5-V to 36-V, 2-A synchronous step-down DC-DC converter in a 16-pin VSON package with wettable flanks. It delivers up to 2 A output current with 27-µA quiescent current in regulation, 500-kHz default switching frequency (adjustable 200 kHz–2.2 MHz), and integrated power-good flag-designed for industrial power supplies and automotive sub-AM band systems.
For engineers reviewing the LM43602DSUT datasheet, LM43602DSUT pinout, LM43602DSUT application, or LM43602DSUT equivalent, key selection criteria include its wide input range (3.5 V–36 V), internal compensation, EN pin precision UVLO (2.2 V typ), soft-start into pre-biased loads, and EN55022 Class B EMI compliance without external filters.
Technical Context
The LM43602DSUT employs fixed-frequency peak current-mode control with DCM and PFM operation at light load to maintain high efficiency across 0–2 A. Its internal compensation eliminates loop-stability tuning, while programmable RT resistor and SYNC pin enable flexible frequency control between 200 kHz and 2.2 MHz.
It integrates high-side (120 mΩ) and low-side (65 mΩ) MOSFETs, a precision 1.011-V feedback reference (±1.2% over –40°C to +125°C), and hiccup-mode short-circuit protection. Thermal shutdown triggers at 160°C with 10°C hysteresis, and the VSON package achieves 31.3°C/W θJA on JEDEC 4-layer board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide VIN applications including 12 V/24 V industrial rails and automotive battery transients. |
| Output Current | 2 A continuous - sufficient for point-of-load regulation of FPGAs, DSPs, and microcontrollers. |
| Quiescent Current | 27 µA in regulation - enables always-on subsystems with minimal standby power loss. |
| Switching Frequency | 500 kHz default (200 kHz–2.2 MHz adjustable) - balances size (inductor/capacitor) and efficiency for compact designs. |
| Feedback Reference | 1.011 V ±1.2% - ensures accurate output voltage setting (e.g., 3.3 V ±1.5% with 1% resistors). |
| Thermal Shutdown | 160°C trip / 150°C recovery - protects against sustained overload or poor heatsinking in enclosed enclosures. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B - reduces need for external EMI filtering in commercial-grade equipment. |
Pinout & Package
LM43602DSUT is housed in a 4.1 mm × 5.1 mm, 16-pin VSON package with wettable flanks for automated optical inspection (AOI) and enhanced thermal performance (θJA = 31.3°C/W). The exposed thermal pad (PAD) must be soldered to PCB ground plane for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2,3) | Switch node | Connects to inductor; carries high di/dt switching current - requires short, low-inductance layout to minimize EMI. |
| CBOOT (4) | Bootstrap capacitor connection | Supplies gate drive for high-side MOSFET; requires 470-nF ceramic capacitor tied to SW pin. |
| VCC (5) | Internal LDO bias supply output | Bypass with 1–10 µF capacitor to AGND; no external loading permitted. |
| BIAS (6) | Optional LDO input | Tie to VOUT (if 3.3 V ≤ VOUT ≤ 28 V) or external 3.3 V/5 V rail to improve light-load efficiency. |
| SYNC (7) | External clock synchronization input | Accepts 200 kHz–2.2 MHz CMOS clock; must be terminated to avoid ringing. |
| RT (8) | Frequency programming | Resistor to AGND sets frequency; open circuit = 500 kHz default. |
| PGOOD (9) | Open-drain power-good flag | Asserts when VOUT is within ±10% of target; requires 10 kΩ–100 kΩ pull-up to logic rail ≤12 V. |
| FB (10) | Feedback sense input | Monitors voltage divider output; 1.011-V reference sets VOUT = 1.011 × (1 + RFBT/RFBB). |
| AGND (11) | Analog ground reference | Ground for internal references and control logic; connect directly to system ground plane. |
| SS/TRK (11) | Soft-start and tracking control | Open = 4.1-ms internal soft-start; capacitor extends time; external ramp enables output voltage tracking. |
| EN (12) | Enable input | Logic-high (>2.2 V) enables regulator; precision UVLO allows system-level brownout control. |
| VIN (13,14) | Main input supply | Connects to input capacitors (CIN); path to PGND must be shortest possible to reduce noise. |
| PGND (15,16) | Power ground | Internal connection to low-side MOSFET source; tie to CIN/COUT grounds and thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction losses and improving full-load efficiency by ~3–5%. |
| Internal compensation | Reduces external component count to only input/output caps, inductor, feedback divider, and optional RT/SS capacitor. |
| Soft-start into pre-biased loads | Prevents reverse current flow during startup when output capacitor is already charged - critical for hot-swap and multi-rail systems. |
| Stable with diverse output capacitors | Works reliably with ceramic, polymer, tantalum, and aluminum electrolytic capacitors - simplifies BOM and sourcing. |
| Output short-circuit protection with hiccup mode | Enters safe low-duty-cycle retry after fault detection - avoids thermal runaway while maintaining system visibility. |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
Use Scenario: 24-V DC distribution in PLC backplanes and I/O modules requiring clean, regulated 3.3 V or 5 V for logic and sensors. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 2 A with tight output tolerance and low ripple. Use Value: 27-µA quiescent current enables energy-efficient standby modes; EN55022 Class B compliance avoids costly EMI filter redesign. |
Use Scenario: Intermediate bus conversion in remote radio units (RRUs) and baseband processing cards operating from 48-V telecom supply. IC Role / Device Role / Timing Role: Synchronous buck converter stepping 48 V down to 12 V or 5 V for FPGA core and I/O rails. Use Value: Adjustable 200 kHz–2.2 MHz frequency allows optimization for size (high-freq) or efficiency (low-freq); SYNC pin enables coherent multi-phase operation. |
| Sub-AM Band Automotive | High Efficiency Point-Of-Load Regulation |
Use Scenario: Infotainment head units and ADAS camera modules powered from 12-V battery with cold-crank (4.5 V) and load-dump (42 V) transients. IC Role / Device Role / Timing Role: Wide-input buck regulator providing stable 3.3 V or 5 V under harsh automotive conditions. Use Value: 3.5 V–36 V input range covers cold-crank to load-dump; thermal shutdown (160°C) and hiccup protection ensure robustness in sealed enclosures. |
Use Scenario: Powering ARM Cortex-M7 microcontrollers, Ethernet PHYs, or USB 3.0 controllers in edge IoT gateways. IC Role / Device Role / Timing Role: Compact, high-efficiency DC-DC stage converting 12 V or 24 V to 1.2 V, 1.8 V, or 3.3 V. Use Value: VSON package with wettable flanks supports automated AOI; 4.1 mm × 5.1 mm footprint saves board space versus HTSSOP alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43603DSQT | 3-A output rating, same 3.5–36 V input, identical pinout and features - higher current capability in same VSON package. | Suitable where future-proofing for >2 A or margin headroom is required; shares same layout and support components. | Select when design may scale to 3 A or requires additional current headroom without changing PCB. |
| TPS54202DDCR | 2-A, 4.5–28 V input, 500-kHz fixed frequency, smaller 6-pin SOT-563 package - lacks SYNC, PGOOD, and BIAS pins. | Better suited for cost-sensitive, space-constrained consumer applications where EMI and tracking are not critical. | Choose for simpler, lower-cost designs without need for synchronization, power-good signaling, or ultra-wide VIN. |
Compared with LM43603DSQT, LM43602DSUT offers tighter current rating match and identical feature set at lower cost; versus TPS54202DDCR, it provides broader input range, more robust protection, and advanced system integration features at the expense of package size.
Availability
LM43602DSUT is available at Aetrix Electronics and suitable for industrial power supplies, telecommunications systems, and sub-AM band automotive applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM43602DSUT 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM43602DSUT belongs to TI's LM436xx family of wide-input synchronous buck converters, designed specifically for high-reliability, compact, and EMI-conscious DC-DC conversion in harsh environments.
FAQ
What is the absolute maximum input voltage rating for the LM43602DSUT?
The LM43602DSUT has an absolute maximum input voltage of 42 V across VIN to PGND, as specified in the Absolute Maximum Ratings table. This rating applies for transient conditions only; continuous operation must remain within the recommended 3.5 V to 36 V range to ensure reliability and thermal stability. Exceeding 42 V risks permanent damage to internal MOSFETs and control circuitry.
Does the LM43602DSUT require external compensation components?
No, the LM43602DSUT 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 consistency across production units. Only the feedback resistor divider, input/output capacitors, inductor, and optional RT/SS capacitors are required for basic operation.
Can the LM43602DSUT safely start up into a pre-biased output?
Yes, the LM43602DSUT supports soft-start into a pre-biased output via its SS/TRK pin functionality. When enabled, the internal soft-start circuit prevents reverse current flow by controlling the high-side MOSFET gate drive until the output voltage ramps up - essential for hot-swap and multi-rail sequencing applications where downstream capacitance is already charged.
How does the BIAS pin improve efficiency in the LM43602DSUT?
The BIAS pin allows the LM43602DSUT to draw bias current from the output rail (when 3.3 V ≤ VOUT ≤ 28 V) instead of VIN, reducing switching losses and improving light-load efficiency by up to 5–8%. When used, a 1–10 µF bypass capacitor must be placed from BIAS to ground; if unused, the pin must be tied to ground.
What thermal performance can be expected from the LM43602DSUT in a standard 4-layer PCB layout?
In a JEDEC-standard 4-layer board configuration, the LM43602DSUT in VSON package achieves a junction-to-ambient thermal resistance (θJA) of 31.3°C/W. With 2 A load and typical efficiency (~92% at 12 V → 3.3 V), power dissipation is ~0.6 W, resulting in ~19°C junction-to-ambient rise - well within the 125°C max operating junction temperature limit when ambient is ≤106°C.
LM43602DSUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-VFDFN Exposed Pad
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 16-SON (4x5)
LM43602DSUT FAQ
1.How can I place an order for LM43602DSUT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43602DSUT 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 LM43602DSUT reliable?
The price and inventory of LM43602DSUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43602DSUT is usually 5 days.
3.What payment methods are accepted for LM43602DSUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43602DSUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43602DSUT?
LM43602DSUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43602DSUT 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 LM43602DSUT?
For technical support, including LM43602DSUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43602DSUT requirements.
6.How does Aetrix verify that LM43602DSUT is sourced from the original manufacturer or authorized distributors?
All LM43602DSUT 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 LM43602DSUT meets industry standards.
7.What is the process for return or replacement of LM43602DSUT?
All LM43602DSUT units undergo pre-shipment inspection (PSI). If there is an issue with LM43602DSUT, 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 LM43602DSUT part is unused and in its original packaging.
Return procedure for LM43602DSUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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