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Texas Instruments LM43602PWPT
- Part No.:
- LM43602PWPT
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43602PWPT.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,390
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Product details
Overview
LM43602PWPT 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 (PWP) package. It delivers regulated output voltage with 1.011-V feedback reference, 27-µA quiescent current in regulation, and integrated high-side/low-side MOSFETs (RDS(on) = 120 mΩ / 65 mΩ). Used in industrial power supplies and automotive sub-AM band systems where wide VIN and EMI-compliant operation are required.
For engineers reviewing the LM43602PWPT datasheet, LM43602PWPT pinout, LM43602PWPT application, or LM43602PWPT equivalent, key selection considerations include its EN precision UVLO (2.2 V typ), adjustable 200 kHz–2.2 MHz switching frequency, internal soft-start (4.1 ms), PGOOD flag, and stable operation with ceramic/polymer/tantalum capacitors.
Technical Context
The LM43602PWPT employs fixed-frequency peak current-mode control with DCM and PFM modes at light load to maintain high efficiency across 0–2 A. Its internal compensation eliminates external loop components, and the RT pin enables resistor-programmable frequency (200 kHz–2.2 MHz) or synchronization to an external clock within that range.
Protection architecture includes cycle-by-cycle current limiting (HS peak = 4.5 A typ, LS valley = 2 A typ), hiccup-mode short-circuit response, thermal shutdown (160°C), and VCC UVLO (3.1 V). The BIAS pin supports efficiency optimization by connecting to VOUT (3.3–28 V) or an external 3.3/5 V rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide-input industrial and automotive rails; absolute max 42 V. |
| Output Current | 2 A continuous - sufficient for point-of-load regulation of FPGAs, DSPs, and microcontrollers. |
| Feedback Reference | 1.011 V (typ) - enables precise output setting via resistor divider; ±1.2% over –40°C to +125°C. |
| Quiescent Current | 27 µA in regulation - enables battery-backed or always-on systems with minimal standby loss. |
| Switching Frequency | 200 kHz to 2.2 MHz - selectable via RT pin; default 500 kHz; allows trade-off between size (high f) and efficiency (low f). |
| EMI Compliance | Meets EN55022/CISPR 22 Class B - verified radiated emission performance without added filtering. |
| Thermal Resistance | RθJA = 38.9°C/W (HTSSOP) - enables 2 A operation at +85°C ambient with standard 4-layer PCB layout. |
Pinout & Package
LM43602PWPT 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 |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high di/dt switching waveform; requires low-inductance layout to minimize EMI. |
| CBOOT (3) | Bootstrap capacitor connection | Supplies gate drive for high-side MOSFET; requires 470-nF ceramic capacitor tied to SW. |
| VCC (4) | Internal LDO output | Bypass with capacitor to AGND; no external loading permitted; powers internal circuitry. |
| BIAS (5) | 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. |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; requires high-speed termination to prevent ringing. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open circuit defaults to 500 kHz. |
| PGOOD (8) | Power-good flag | Open-drain output; requires 10–100 kΩ pull-up; asserts when VOUT is within ±12% of target. |
| FB (9) | Feedback sense | Connects to resistor divider midpoint; regulates output via 1.011-V internal reference. |
| AGND (10) | Analog ground | Reference for internal references and logic; connect directly to system ground plane. |
| SS/TRK (11) | Soft-start/tracking control | Internal 4.1-ms soft-start when floating; add capacitor to extend time or apply external ramp for tracking. |
| EN (12) | Enable input | Logic-level control with precision UVLO (2.2 V rising threshold); hysteresis ensures clean turn-on/off. |
| VIN (13,14) | Main input supply | Connects to input capacitor (CIN) and high-side FET; shortest possible path to PGND required. |
| PGND (15,16) | Power ground | Low-side FET source connection; tie to system ground, CIN, COUT, and thermal pad. |
| PAD | Thermal pad | Internally connected to AGND; must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves full-load efficiency by >3% vs. asynchronous designs. |
| Internal compensation | Removes need for external Type-II/III compensation network; simplifies design and reduces BOM count by ≥4 components. |
| Stable with diverse output capacitors | Validated with ceramic, polymer, tantalum, and aluminum electrolytic capacitors - increases flexibility in cost/space-constrained designs. |
| Pre-biased soft-start | Allows safe startup into pre-charged output rails without reverse current flow - critical for hot-swap and multi-rail sequencing. |
| EMI-optimized layout & operation | Meets EN55022 Class B radiated emissions without ferrite beads or common-mode chokes - reduces solution footprint and cost. |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
Use Scenario: 24-V DC distribution powering FPGA I/O banks and auxiliary rails in programmable logic controllers. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 24 V to 3.3 V/1.8 V with tight regulation and fast transient response. Use Value: 2-A capability and 27-µA quiescent current support both active operation and low-power sleep states without compromising efficiency. |
Use Scenario: Intermediate bus conversion in 48-V telecom rectifiers supplying 12 V and 5 V to baseband processing modules. IC Role / Device Role / Timing Role: Wide-VIN buck regulator delivering stable output under varying line conditions and load transients. Use Value: EN precision UVLO (2.2 V) enables controlled power sequencing; PGOOD flag confirms rail readiness to host controller. |
| Sub-AM Band Automotive | General Purpose Wide VIN Regulation |
Use Scenario: Infotainment head unit power management where input may drop to 4.5 V during cold crank and surge to 36 V during load dump. IC Role / Device Role / Timing Role: Input-tolerant DC-DC converter maintaining 5 V or 3.3 V output across automotive transients. Use Value: 3.5–36 V input range and 42-V absolute max rating eliminate need for upstream protection circuitry in 12-V systems. |
Use Scenario: Universal adapter design supporting multiple output voltages (3.3 V, 5 V, 12 V) from variable AC/DC inputs. IC Role / Device Role / Timing Role: Flexible, single-chip regulator configurable via FB divider and RT resistor for diverse output requirements. Use Value: Adjustable frequency and tracking capability simplify multi-rail designs; internal soft-start prevents inrush into downstream capacitance. |
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 |
|---|---|---|---|
| LM43603PWPT | 3-A output current, identical pinout and feature set; higher RDS(on) (HS: 85 mΩ, LS: 40 mΩ) and slightly higher IQ (32 µA). | Required where sustained >2 A load or higher peak current margin is needed; same PCB layout usable. | Select LM43603PWPT if future-proofing for higher current or derating is required; otherwise LM43602PWPT offers optimal size/cost balance at 2 A. |
| TPS54202HDDCR | 2-A, 4.5–28 V input, 500-kHz fixed frequency, no SYNC or BIAS pins; lower IQ (14 µA) but lacks PGOOD and precision EN. | Suitable for cost-sensitive, non-automotive applications where EMI compliance and rail sequencing are less critical. | Choose TPS54202HDDCR only for simpler, lower-cost designs without tracking, sync, or strict EN thresholds; LM43602PWPT provides broader system integration features. |
Compared with LM43603PWPT and TPS54202HDDCR, the LM43602PWPT uniquely balances 2-A capability, EN precision (2.2 V), PGOOD flag, and EN55022 Class B compliance in a compact HTSSOP package-making it optimal for space-constrained, safety-aware industrial and automotive point-of-load designs.
Availability
LM43602PWPT 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 LM43602PWPT 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 over 90 years of innovation history.
The LM43602PWPT belongs to TI's wide-input synchronous buck regulator product line, designed specifically for robust, high-efficiency DC-DC conversion in harsh environments including industrial automation, telecom infrastructure, and automotive subsystems.
FAQ
What is the absolute maximum input voltage rating for the LM43602PWPT?
The LM43602PWPT has an absolute maximum input voltage (VIN to PGND) of 42 V. This rating applies under transient conditions only; continuous operation must remain within the recommended 3.5 V to 36 V range. Exceeding 42 V risks permanent damage, and operation near this limit requires careful attention to voltage spikes and layout parasitics.
Does the LM43602PWPT require external compensation components?
No, the LM43602PWPT features internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This reduces design complexity, saves board space, and lowers BOM count. The device achieves stable operation across its full load and input voltage range without user-adjusted compensation.
How does the BIAS pin improve efficiency in the LM43602PWPT?
The BIAS pin on the LM43602PWPT allows connection to the output rail (3.3–28 V) or an external 3.3/5 V supply, enabling the internal LDO to operate more efficiently than from VIN alone. When used, it reduces power dissipation in the bias circuitry and improves overall converter efficiency-especially at higher input voltages.
Can the LM43602PWPT synchronize to an external clock, and what are the valid frequency ranges?
Yes, the LM43602PWPT supports frequency synchronization via the SYNC pin across 200 kHz to 2.2 MHz. The external clock must meet TTL-compatible thresholds (VH ≥ 2 V, VL ≤ 0.4 V) and maintain 10%–90% duty cycle. Proper high-speed termination is required to prevent signal ringing and ensure reliable locking.
What thermal performance can be expected from the LM43602PWPT in a standard 4-layer PCB layout?
In a JEDEC-standard 4-layer PCB layout, the LM43602PWPT (HTSSOP) exhibits RθJA = 38.9°C/W. At 2 A load and 12 V input, typical power dissipation is ~0.5 W, resulting in ~20°C junction-to-ambient rise above ambient-well within the –40°C to +125°C operating range. Thermal pad soldering to the ground plane is mandatory for this performance.
LM43602PWPT 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
LM43602PWPT FAQ
1.How can I place an order for LM43602PWPT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43602PWPT 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 LM43602PWPT reliable?
The price and inventory of LM43602PWPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43602PWPT is usually 5 days.
3.What payment methods are accepted for LM43602PWPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43602PWPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43602PWPT?
LM43602PWPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43602PWPT 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 LM43602PWPT?
For technical support, including LM43602PWPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43602PWPT requirements.
6.How does Aetrix verify that LM43602PWPT is sourced from the original manufacturer or authorized distributors?
All LM43602PWPT 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 LM43602PWPT meets industry standards.
7.What is the process for return or replacement of LM43602PWPT?
All LM43602PWPT units undergo pre-shipment inspection (PSI). If there is an issue with LM43602PWPT, 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 LM43602PWPT part is unused and in its original packaging.
Return procedure for LM43602PWPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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