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Texas Instruments LM43602PWP
- Part No.:
- LM43602PWP
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43602PWP.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,841
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Product details
Overview
LM43602PWP from Texas Instruments is a 3.5-V to 36-V, 2-A synchronous step-down DC-DC converter in HTSSOP-16 package, featuring 27-µA quiescent current, 500-kHz default switching frequency, and integrated power-good flag-designed for industrial power supplies and automotive sub-AM band applications requiring compact, EMI-compliant regulation.
For engineers reviewing the LM43602PWP datasheet, LM43602PWP pinout, LM43602PWP application, or LM43602PWP equivalent, key selection considerations include its EN-controlled UVLO threshold (2.2 V), internal soft-start (4.1 ms), ±1% FB reference accuracy, and EN55022 Class B radiated emission compliance verified on the LM43602PWPEVM evaluation board.
Technical Context
The LM43602PWP employs fixed-frequency peak current-mode control with DCM/PFM light-load operation, enabling high efficiency across 0–2 A load range while maintaining stable regulation under input transients from 3.5 V to 36 V. Its internal compensation eliminates external loop components, and the 200 kHz–2.2 MHz programmable frequency supports layout optimization for size or thermal performance.
It integrates dual N-channel MOSFETs (120 mΩ HS / 65 mΩ LS), precision enable with 290-mV hysteresis, and tracking-capable SS/TRK pin for sequencing. Protection includes hiccup-mode short-circuit response, thermal shutdown at 160°C, and cycle-by-cycle current limiting with 4.5-A typical peak limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide-VIN industrial and automotive rails without pre-regulation |
| Output Current | 2 A continuous - sufficient for point-of-load regulation of FPGAs, DSPs, and microcontrollers |
| Quiescent Current | 27 µA in regulation - enables battery-backed systems to maintain >1-year standby life |
| Switching Frequency | 500 kHz default, adjustable 200 kHz–2.2 MHz - balances inductor size vs. conduction loss |
| Feedback Accuracy | ±1% over –40°C to +125°C - ensures tight output tolerance without external trimming |
| EMI Compliance | Meets EN55022/CISPR 22 Class B radiated limits - validated on LM43602PWPEVM board |
| Thermal Resistance | RθJA = 38.9°C/W (HTSSOP) - enables 2-A operation at +85°C ambient with minimal copper |
Pinout & Package
LM43602PWP 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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | Connects to inductor; carries high di/dt switching current - requires shortest possible PCB trace |
| 3 CBOOT | Bootstrap capacitor terminal | Supplies gate drive for high-side MOSFET; requires 470-nF ceramic capacitor to SW |
| 4 VCC | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; no external loading permitted |
| 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 |
| 6 SYNC | External clock input | Synchronizes switching to external 200 kHz–2.2 MHz source; terminate properly to avoid ringing |
| 7 RT | Frequency programming | Resistor to AGND sets frequency; open circuit = 500 kHz default |
| 8 PGOOD | Open-drain power-good flag | Signals valid output after soft-start; requires 10–100 kΩ pull-up to ≤12 V logic rail |
| 9 FB | Feedback sense input | Monitors voltage divider midpoint; 1.011 V nominal reference sets VOUT = 1.011 × (1 + RFBT/RFBB) |
| 10 AGND | Analog ground reference | Ground for internal references and logic; connect directly to system ground plane |
| 11 SS/TRK | Soft-start/tracking control | Internal 4.1-ms ramp when floating; add capacitor to extend time or apply external ramp for sequencing |
| 12 EN | Enable input | Logic-level control with 2.2 V rising threshold; precision UVLO allows system-level brownout management |
| 13,14 VIN | Main input supply | Connects to input capacitor and high-side FET; path to CIN and PGND must be minimized |
| 15,16 PGND | Power ground | Low-side FET source connection; tie to AGND, PAD, and all capacitor grounds with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing BOM count and improving full-load efficiency by ≥3% |
| Internal soft-start with tracking capability | Prevents inrush current and enables controlled power-up sequencing with external voltage ramps |
| Stable with diverse output capacitors | Supports ceramic, polymer, tantalum, and aluminum electrolytic types - simplifies capacitor selection |
| Discontinuous conduction mode (DCM) | Maintains >85% efficiency at 10-mA loads - critical for always-on IoT and sensor nodes |
| Power-good flag with deglitching | 220-µs rise/fall delay prevents false triggering during transient events - improves system reliability |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
Use Scenario: 24-V DC distribution in PLC backplanes powering I/O modules and communication interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V to 3.3 V/5 V for FPGA configuration, Ethernet PHYs, and isolated UARTs. Use Value: 27-µA quiescent current extends backup battery life; EN55022 Class B compliance avoids costly shielding in DIN-rail enclosures. |
Use Scenario: Point-of-load conversion in 48-V telecom rectifier shelves feeding baseband processors and RF front-end bias rails. IC Role / Device Role / Timing Role: Secondary regulator delivering tightly regulated 1.2 V and 3.3 V from intermediate 12-V bus. Use Value: ±1% FB accuracy ensures stable core voltage under dynamic load steps; hiccup-mode protection prevents cascading failures in dense card cages. |
| Sub-AM Band Automotive | High Efficiency Point-Of-Load Regulation |
Use Scenario: Infotainment head-unit power tree where 12-V battery input must generate 5-V USB, 3.3-V MCU, and 1.8-V memory rails. IC Role / Device Role / Timing Role: Main buck converter handling cold-crank (4.5 V) to load-dump (36 V) transients without dropout or reset. Use Value: 3.5–36-V input range and 160°C thermal shutdown ensure robustness across automotive temperature extremes and fault conditions. |
Use Scenario: FPGA or SoC power delivery in edge AI accelerators requiring fast transient response and low-noise 0.85-V core supply. IC Role / Device Role / Timing Role: Core voltage regulator with SS/TRK pin synchronized to processor reset assertion for safe power sequencing. Use Value: Internal compensation and 200–2200-kHz frequency tuning allow optimal trade-off between transient response and EMI filtering component size. |
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 |
|---|---|---|---|
| LM43603PWP | 3-A output rating, identical pinout and feature set; higher RDS(on) (HS: 90 mΩ, LS: 45 mΩ) but same thermal footprint | Required for >2-A loads; same PCB layout usable with minor inductor/capacitor upgrades | Select when future-proofing for higher current or parallel operation; shares same design files and layout |
| TPS54202HDDCR | 2-A, 4.5–17-V input, 500-kHz fixed frequency, no SYNC or tracking; smaller SOT-563 package (1.6 mm × 2.9 mm) | Targeted at space-constrained consumer electronics; lacks EN55022 validation and wide-VIN capability | Choose for cost-sensitive, low-input-voltage apps where EMI certification and 36-V surge immunity are not required |
Compared with LM43602PWP, LM43603PWP offers scalable current capacity in identical packaging, while TPS54202HDDCR trades wide-VIN robustness and EMI certification for ultra-compact size-making LM43602PWP the optimal balance for industrial and automotive designs demanding both reliability and regulatory compliance.
Availability
LM43602PWP 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 support, and traceable sourcing.
Supply support for LM43602PWP 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 expertise in power management ICs for mission-critical applications.
The LM43602PWP belongs to TI's LM436xx family of wide-input synchronous buck converters, designed specifically for industrial, automotive, and telecom systems needing high efficiency, small solution size, and certified EMI performance without complex layout constraints.
FAQ
What is the absolute maximum input voltage rating for the LM43602PWP?
The LM43602PWP has an absolute maximum input voltage of 42 V across VIN to PGND, as specified in Section 6.1 of the datasheet. This rating applies only for transient conditions-not continuous operation-which is limited to 36 V per recommended operating conditions. Exceeding 42 V risks permanent damage, and the device incorporates VCC undervoltage lockout and thermal shutdown to protect against sustained overvoltage or overload scenarios.
Does the LM43602PWP require external compensation components?
No, the LM43602PWP features internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and ensures stable operation across the full 3.5–36-V input range and 1–28-V output range with standard output capacitors. The internal loop is optimized for use with common ceramic, polymer, and electrolytic capacitors without additional stability tuning.
How does the BIAS pin improve efficiency in the LM43602PWP?
The BIAS pin on the LM43602PWP allows the internal LDO to be powered from the output rail (when 3.3 V ≤ VOUT ≤ 28 V) instead of VIN, reducing power dissipation in the bias circuitry. When tied to VOUT, it lowers total quiescent current and improves light-load efficiency by up to 15% compared to VIN-powered operation-particularly beneficial in battery-powered or energy-harvesting systems where every microamp counts.
Can the LM43602PWP synchronize to an external clock, and what are the timing requirements?
Yes, the LM43602PWP supports synchronization via its SYNC pin across 200 kHz–2.2 MHz. The external clock must meet VSYNC-HIGH ≥ 2 V, VSYNC-LOW ≤ 0.4 V, duty cycle 10–90%, and minimum ON/OFF time ≥ 80 ns. Proper high-speed termination is required to prevent ringing, and the SYNC signal must be free of jitter exceeding ±1% to maintain stable phase alignment and avoid beat frequencies in multi-rail systems.
What is the purpose of the SS/TRK pin on the LM43602PWP, and how is it configured for voltage tracking?
The SS/TRK pin on the LM43602PWP serves dual functions: internal soft-start (4.1 ms when floating) and output voltage tracking. For tracking, an external voltage ramp (e.g., from another regulator's SS pin) is applied to SS/TRK, forcing the LM43602PWP's output to follow that ramp with unity gain-enabling precise power sequencing in multi-rail systems. No additional components are needed beyond the driving source, and the pin accepts voltages from 0 V to VREF (1.011 V) for accurate proportional control.
LM43602PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM43602PWP FAQ
1.How can I place an order for LM43602PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43602PWP 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 LM43602PWP reliable?
The price and inventory of LM43602PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43602PWP is usually 5 days.
3.What payment methods are accepted for LM43602PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43602PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43602PWP?
LM43602PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43602PWP 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 LM43602PWP?
For technical support, including LM43602PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43602PWP requirements.
6.How does Aetrix verify that LM43602PWP is sourced from the original manufacturer or authorized distributors?
All LM43602PWP 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 LM43602PWP meets industry standards.
7.What is the process for return or replacement of LM43602PWP?
All LM43602PWP units undergo pre-shipment inspection (PSI). If there is an issue with LM43602PWP, 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 LM43602PWP part is unused and in its original packaging.
Return procedure for LM43602PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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