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Texas Instruments LM43602PWPR
- Part No.:
- LM43602PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43602PWPR.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
LM43602PWPR from Texas Instruments is a 3.5-V to 36-V input, 2-A synchronous step-down DC-DC converter in a 16-pin HTSSOP package (5.1 mm × 6.6 mm), featuring 27-µA quiescent current in regulation, 500-kHz default switching frequency, and integrated power-good flag. It delivers high efficiency across load range via DCM/PFM light-load operation and supports output voltage tracking and soft-start into pre-biased loads - ideal for industrial power supplies and automotive sub-AM band systems.
For engineers reviewing the LM43602PWPR datasheet, LM43602PWPR pinout, LM43602PWPR application, or LM43602PWPR equivalent, key selection considerations include its wide VIN range (3.5–36 V), 2-A continuous output capability, EN pin with precision UVLO (2.2 V typical enable threshold), internal compensation, and EN55022 Class B EMI compliance without external filters.
Technical Context
The LM43602PWPR employs fixed-frequency peak current-mode control with cycle-by-cycle current limiting and automatic transition between PWM, PFM, and DCM modes to maintain high efficiency from full load down to µA-level currents. Its internal compensation eliminates external loop components, while the RT pin enables resistor-programmable frequency (200 kHz–2.2 MHz) and SYNC pin allows external clock synchronization within the same range.
Protection architecture includes hiccup-mode short-circuit response (32-cycle wait, 5.5-ms retry), thermal shutdown at 160°C, VCC UVLO (3.1 V), and precision enable with 290-mV hysteresis. The BIAS pin supports efficiency optimization by connecting to VOUT (3.3–28 V) or an external 3.3/5-V rail, reducing VIN supply current by shifting bias sourcing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide industrial and automotive battery-fed rails including 12-V and 24-V systems. |
| Output Current | 2 A continuous - sufficient for point-of-load regulation of FPGAs, microcontrollers, and communication ICs. |
| Quiescent Current | 27 µA in regulation - enables always-on subsystems with minimal standby power loss. |
| Switching Frequency | Default 500 kHz, adjustable 200 kHz–2.2 MHz - balances size (higher fSW → smaller inductor/capacitor) and efficiency (lower fSW → reduced switching loss). |
| Feedback Reference | 1.011 V ±1.2% over –40°C to +125°C - ensures tight output voltage accuracy across temperature without external trimming. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B - reduces need for external EMI filtering in commercial equipment designs. |
| Thermal Resistance | RθJA = 38.9°C/W (HTSSOP) - enables 2-A operation up to +85°C ambient with standard 2-layer PCB and minimal copper area. |
Pinout & Package
LM43602PWPR is housed in a 16-lead HTSSOP (PWP) package measuring 5.1 mm × 6.6 mm × 1.2 mm, with exposed thermal pad connected internally to AGND for enhanced heat dissipation. Pin 1 is SW (high-side switch node); pins 15–16 are PGND (power ground); pin 10 is AGND (analog ground); and pin 13–14 are VIN (input supply). The thermal pad must be soldered to a dedicated PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high di/dt switching current - requires shortest possible trace to minimize EMI and voltage spikes. |
| CBOOT (3) | Bootstrap capacitor connection | Supplies gate drive for high-side MOSFET; requires 470-nF ceramic capacitor from CBOOT to SW for reliable bootstrapping. |
| VCC (4) | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; no external loading permitted - powers internal circuitry only. |
| BIAS (5) | Optional LDO input | Tie to VOUT (if 3.3–28 V) or external 3.3/5 V rail to reduce VIN current and improve efficiency; bypass with 1–10 µF capacitor. |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; requires proper high-speed termination to prevent ringing and false triggering. |
| RT (7) | Frequency programming | Connect resistor to AGND to set frequency; open circuit defaults to 500 kHz - resistor value determines exact fSW. |
| PGOOD (8) | Open-drain power-good flag | Asserts high when VOUT is within ±10% of target; requires 10–100 kΩ pull-up to logic rail ≤12 V for system sequencing. |
| FB (9) | Feedback sense input | Connects to resistor divider midpoint; internal 1.011-V reference sets VOUT = 1.011 × (1 + RFBT/RFBB) - no shorting to ground allowed. |
| AGND (10) | Analog ground reference | Ground for internal references and error amplifier; connect directly to system ground plane with low-impedance path. |
| SS/TRK (11) | Soft-start and tracking control | Open for 4.1-ms internal soft-start; add capacitor to extend ramp time or apply external voltage ramp for output tracking. |
| EN (12) | Enable input | Logic-high (>2.2 V) enables regulator; precision UVLO allows programmable system-level undervoltage lockout. |
| VIN (13,14) | Main input supply | Connect to bulk input capacitor (CIN) with shortest possible path to PGND - critical for stability and EMI performance. |
| PGND (15,16) | Power ground return | Low-side MOSFET source connection; tie to AGND, CIN, COUT, and thermal pad - forms primary high-current return path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and improves full-load efficiency by ~3–5% vs. asynchronous designs. |
| Internal compensation | Removes requirement for external Type-II/III compensation network - simplifies layout and accelerates design cycle. |
| Stable with diverse output capacitors | Supports ceramic, polymer, tantalum, and aluminum electrolytic capacitors - increases flexibility in cost, size, and reliability trade-offs. |
| Pre-biased soft-start | Allows safe startup into powered outputs (e.g., hot-swap, backplane) without reverse current flow or output overshoot. |
| Output voltage tracking | Enables coordinated power-up/down sequencing with other rails using SS/TRK pin as slave or master control input. |
| Hiccup-mode short-circuit protection | Limits fault energy during sustained shorts - prevents thermal runaway and enables automatic recovery without manual reset. |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
Use Scenario: Distributed 3.3-V or 5-V rails powering PLC I/O modules, sensors, and fieldbus interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24-V DC bus to stable low-voltage logic supply with high PSRR and low noise. Use Value: 27-µA quiescent current extends battery backup runtime; EN pin enables remote on/off control via PLC logic outputs. |
Use Scenario: Intermediate 5-V or 12-V conversion stage in telecom line cards, optical transceivers, and baseband processing units. IC Role / Device Role / Timing Role: Point-of-load regulator delivering clean, regulated power to high-speed SerDes and DSPs with fast transient response. Use Value: Internal compensation and 500-kHz switching enable compact 12-mm² solution; meets EN55022 Class B without added ferrites. |
| Sub-AM Band Automotive | High Efficiency Point-Of-Load Regulation |
Use Scenario: Powering infotainment displays, ADAS camera modules, and body control units from 12-V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Wide-input buck converter maintaining regulation down to 3.5-V input during cranking events. Use Value: 36-V absolute max rating and robust EN UVLO (2.2 V) ensure reliable operation across automotive load-dump and start-stop conditions. |
Use Scenario: Local regulation for FPGA core, memory, and analog peripherals in embedded vision or edge AI devices. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC-DC converter placed adjacent to load to minimize IR drop and noise coupling. Use Value: 2-A capability with 65-mΩ low-side RDS(on) minimizes dropout and thermal rise; SS/TRK pin enables precise power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43603PWPR | 3-A output current, identical pinout and feature set; higher RDS(on) (HS: 85 mΩ, LS: 45 mΩ) but larger thermal footprint. | Suitable where higher load margin or future-proofing for 3-A peak loads is required; same PCB layout but increased copper area recommended. | Select LM43603PWPR if system peak current exceeds 2 A or long-term derating headroom is needed. |
| TPS54202HDDCR | 2-A, 4.5–17-V input, 500-kHz fixed frequency, no BIAS pin or tracking; smaller SOT-563 package (1.6 mm × 2.9 mm). | Targeted at space-constrained consumer electronics; lacks EN55022 compliance and wide-VIN capability of LM43602PWPR. | Choose TPS54202HDDCR only for low-cost, low-VIN (<17 V), ultra-compact applications where EMI certification is not required. |
Compared with LM43602PWPR, LM43603PWPR offers higher current capacity in identical packaging but requires more thermal management, while TPS54202HDDCR trades wide input range and EMI compliance for minimal footprint - making LM43602PWPR optimal for industrial and automotive 2-A applications demanding robustness and certification.
Availability
LM43602PWPR is available at Aetrix Electronics and suitable for industrial power supplies, telecommunications infrastructure, and sub-AM band automotive systems requiring stable component supply, long lifecycle support, and guaranteed traceability.
Supply support for LM43602PWPR 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 power management technologies, with decades of expertise in high-reliability DC-DC conversion.
The LM43602PWPR belongs to TI's LM436xx family of wide-input synchronous buck converters, designed specifically for industrial, automotive, and telecom applications demanding high efficiency, small solution size, and regulatory-compliant EMI performance.
FAQ
What is the absolute maximum input voltage rating for the LM43602PWPR?
The LM43602PWPR has an absolute maximum input voltage rating of 42 V across VIN to PGND, as specified in Section 6.1 of the datasheet. This rating applies under transient conditions (e.g., load dump), but continuous operation must remain within the recommended 3.5–36 V range to ensure reliability and thermal safety. Exceeding 42 V risks permanent damage to the internal high-side MOSFET and control circuitry. Always include appropriate input clamping or TVS protection in automotive or industrial environments where transients may occur.
Does the LM43602PWPR require external compensation components?
No, the LM43602PWPR features internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and improves layout robustness. The internal loop is optimized for stability with common output capacitor types (ceramic, polymer, tantalum, aluminum), and the device maintains phase margin >45° across all recommended operating conditions. External compensation is neither supported nor required for standard applications using the default 500-kHz frequency or resistor-programmed variants.
How does the BIAS pin improve efficiency in the LM43602PWPR?
The BIAS pin on the LM43602PWPR allows the internal LDO to draw bias current from VOUT (when 3.3–28 V) or an external 3.3/5-V rail instead of VIN, reducing total input supply current and improving overall efficiency - especially at higher output voltages. When tied to VOUT, the device shifts bias sourcing away from the high-voltage input rail, lowering power dissipation in the internal LDO. This configuration is recommended unless VOUT falls outside the 3.3–28 V range or an external rail is unavailable, in which case BIAS should be grounded.
Can the LM43602PWPR safely start up into a pre-biased output?
Yes, the LM43602PWPR supports soft-start into a pre-biased output via its internal soft-start circuitry and controlled gate drive sequencing. When enabled, the device monitors the FB pin voltage and initiates switching only after confirming the output is below the target regulation level, preventing reverse current flow through the low-side MOSFET. This capability is confirmed in Section 7.3.10 of the datasheet and makes LM43602PWPR suitable for hot-swap, redundant power, and multi-rail sequencing applications without requiring external isolation components.
What is the purpose of the SS/TRK pin on the LM43602PWPR?
The SS/TRK pin on the LM43602PWPR serves dual functions: soft-start control and output voltage tracking. When left floating, it provides a fixed 4.1-ms internal soft-start ramp. Connecting an external capacitor extends this time linearly; applying an external voltage ramp (e.g., from another regulator's SS pin) enables precise output voltage tracking during power-up/down. This functionality is essential for sequencing multiple rails in FPGAs, processors, or mixed-signal systems where voltage ordering and slew rate matching are critical to avoid latch-up or damage.
LM43602PWPR 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM43602PWPR FAQ
1.How can I place an order for LM43602PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43602PWPR 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 LM43602PWPR reliable?
The price and inventory of LM43602PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43602PWPR is usually 5 days.
3.What payment methods are accepted for LM43602PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43602PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43602PWPR?
LM43602PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43602PWPR 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 LM43602PWPR?
For technical support, including LM43602PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43602PWPR requirements.
6.How does Aetrix verify that LM43602PWPR is sourced from the original manufacturer or authorized distributors?
All LM43602PWPR 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 LM43602PWPR meets industry standards.
7.What is the process for return or replacement of LM43602PWPR?
All LM43602PWPR units undergo pre-shipment inspection (PSI). If there is an issue with LM43602PWPR, 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 LM43602PWPR part is unused and in its original packaging.
Return procedure for LM43602PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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