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Analog Devices Inc. LT1506IS8-3.3#TRPBF
- Part No.:
- LT1506IS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1506IS8-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,541
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Product details
Overview
LT1506IS8-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 3.3V, 4.5A monolithic synchronous step-down switching regulator in SO-8 package, featuring 500kHz constant-frequency current-mode control, integrated 0.07Ω NPN power switch, and operation down to 4V input. It delivers high efficiency in portable computers and battery-powered systems using surface-mount inductors as small as 1.8µH.
For engineers reviewing the LT1506IS8-3.3#TRPBF datasheet, LT1506IS8-3.3#TRPBF pinout, LT1506IS8-3.3#TRPBF application, or LT1506IS8-3.3#TRPBF equivalent, key selection criteria include its fixed 3.3V output with ±1.5% tolerance, 20µA shutdown current, cycle-by-cycle current limiting, thermal shutdown, and compatibility with standard SO-8 PCB footprints and fused-ground layout requirements.
Technical Context
The LT1506IS8-3.3#TRPBF implements a current-mode buck topology with internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and slope compensation to prevent subharmonic oscillation. Its BOOST pin enables saturation of the on-die NPN switch, reducing conduction loss to that of a 0.07Ω FET while maintaining bipolar process advantages.
It uses SENSE pin (not FB) for fixed 3.3V regulation, with 3.25–3.35V output voltage accuracy over temperature and line. Shutdown threshold is 0.37V (start-up) and 0.60V (full micropower), and synchronization capability is omitted-this variant replaces SHDN with SENSE, confirming it is the fixed-output, non-synchronizable version per package marking and ordering table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% (3.25V–3.35V), guaranteed across –40°C to 125°C junction temp |
| Max Output Current | 4.5A at ≤50% duty cycle; derates to 3.7A at 80% duty cycle due to slope compensation |
| Switch On Resistance | 0.07Ω typical (measured at 4.5A), enabling >89% efficiency at 5V→3.3V/4A |
| Switching Frequency | 460–540kHz (typ 500kHz), fixed and internally compensated-no external sync support |
| Min Input Voltage | 4.0V minimum (guaranteed bias regulation), supports single-cell Li-ion and 5V rail inputs |
| Shutdown Current | 15–50µA (typ 20µA), enabling ultra-low-power standby in battery systems |
| Thermal Protection | Internal thermal shutdown active above 125°C junction temperature, with automatic recovery |
Pinout & Package
LT1506IS8-3.3#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with fused ground pin (Pin 4), rated θJA = 80°C/W on standard PCB layout. The GND pin is internally connected to the exposed tab for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply and collector of internal NPN switch | Must be bypassed near pin with low-ESR capacitor; handles full input current and high dI/dt transients |
| BOOST (Pin 2) | Boost capacitor drive node | Requires external boost capacitor (e.g., 1.5nF) tied to VIN via diode; enables switch saturation and low VCE(sat) |
| GND (Pin 4) | Power and signal reference ground | Fused lead connects directly to internal tab-must be soldered to large copper area for thermal and EMI control |
| VSW (Pin 5) | Emitter of internal NPN switch | Drives inductor; swings from ~0V to VIN during operation; requires catch diode clamping to –0.8V max |
| SENSE (Pin 6) | Fixed-output voltage sense input | Internally connected to 3.3V output divider; replaces FB pin-no external resistor network required |
| VC (Pin 7) | Error amplifier output / current limit comparator input | Used for loop compensation; voltage ranges from ~1V (light load) to ~2V (full load); can clamp for override |
| SHDN (Pin 8) | Shutdown control input | Logic-level input: <0.6V = shutdown (20µA IQ), >2.38V = UVLO lockout; no sync function on this variant |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4.5A NPN power switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout complexity |
| 0.07Ω switch RON | Enables high efficiency (>89%) at 4A without heatsinking in compact SO-8 footprint |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation |
| 4V minimum input operation | Supports direct regulation from single Li-ion (3.0–4.2V) with headroom, unlike LT1374 (5.5V min) |
| Thermal shutdown + full-cycle short-circuit protection | Ensures robustness under overload, ambient temperature variation, and PCB thermal gradients |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core logic rail in ultraportable notebooks requiring 3.3V/3A from 5V or Li-ion input. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 3.3V to CPU I/O, memory interfaces, and peripheral controllers. Use Value: Enables use of 1.8µH inductors and eliminates external feedback resistors-reducing solution size by >30% vs adjustable regulators. | Use Scenario: Power management in handheld test equipment operating from two AA cells (2.4–3.2V) boosted to 5V, then stepped to 3.3V. IC Role / Device Role / Timing Role: Secondary buck stage providing low-noise, high-efficiency 3.3V for microcontroller and sensor subsystems. Use Value: 20µA shutdown current extends battery life beyond 1 year in sleep mode; 4V min input ensures stable operation even at end-of-discharge. |
| Battery Charger Auxiliary Rail | Distributed Power Architecture |
Use Scenario: Providing isolated 3.3V bias for charger IC communication, LED indicators, and USB interface in multi-cell Li-ion chargers. IC Role / Device Role / Timing Role: Standalone point-of-load regulator powered from main charger output (e.g., 12V or 19V bus). Use Value: Fixed 3.3V output eliminates calibration drift; fused-GND SO-8 layout simplifies compliance with IEC 62368 creepage/clearance requirements. | Use Scenario: Local 3.3V regulation on daughterboards in industrial PLC backplanes where 12V or 24V intermediate bus is available. IC Role / Device Role / Timing Role: Compact, thermally robust POL converter replacing discrete buck modules in space-constrained slots. Use Value: 80°C/W thermal resistance allows 4.5A continuous output without airflow; cycle-by-cycle current limiting prevents fault propagation across distributed rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-3.3#TRPBF | 4A, 3MHz synchronous buck; 2.7–5.5V input; integrated MOSFETs; 12-lead DFN | Higher frequency enables smaller inductors (1.0µH), but requires tighter layout and has lower max current | Select for ultra-compact designs where board area is critical and 4A suffices; not drop-in due to different pinout and package |
| TPS54331DR | 3A, 570kHz adjustable buck; 3.5–28V input; external MOSFETs; SO-8 with power pad | Wider input range and adjustable output, but lacks fixed 3.3V option and requires FB resistor network | Select when input exceeds 15V or output voltage flexibility is needed; requires redesign of feedback and compensation network |
Compared with LTC3605EDE-3.3#TRPBF and TPS54331DR, the LT1506IS8-3.3#TRPBF offers higher current (4.5A), lower minimum input (4V), and true fixed-output simplicity-but trades off switching frequency headroom and modern synchronous rectification.
Availability
LT1506IS8-3.3#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across temperature and production lots.
Supply support for LT1506IS8-3.3#TRPBF 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
Analog Devices acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LT® product family, known for precision analog and power management ICs serving industrial, automotive, and communications markets.
The LT1506 series was designed specifically for high-current, low-input-voltage DC/DC conversion in space-constrained portable and battery-operated equipment-emphasizing integration, thermal robustness, and ease of use without external compensation.
FAQ
What is the output voltage tolerance of the LT1506IS8-3.3#TRPBF over temperature and line?
The LT1506IS8-3.3#TRPBF guarantees a fixed 3.3V output with ±1.5% tolerance (3.25V to 3.35V) across the full –40°C to 125°C junction temperature range and 4V to 15V input voltage range. This specification is validated per the Electrical Characteristics table and confirmed in Typical Performance Characteristics graphs showing <±0.015V drift over temperature.
Does the LT1506IS8-3.3#TRPBF support external synchronization?
No, the LT1506IS8-3.3#TRPBF does not support external synchronization. Per the PACKAGE/ORDER INFORMATION table and Pin Functions section, the -3.3 variant replaces the SHDN pin with SENSE and omits SYNC functionality entirely. Only variants marked "-SYNC" or "-3.3 SYNC" provide synchronization capability; this part is strictly shutdown-only.
What is the maximum allowable input voltage for the LT1506IS8-3.3#TRPBF?
The absolute maximum input voltage for the LT1506IS8-3.3#TRPBF is 16V, as specified in the Absolute Maximum Ratings table. Continuous operation above 15V is not recommended; the device is characterized for reliable operation from 4V to 15V input, with efficiency and thermal performance optimized in that range.
How does the BOOST pin function in the LT1506IS8-3.3#TRPBF, and what external components are required?
The BOOST pin in the LT1506IS8-3.3#TRPBF supplies a voltage higher than VIN to saturate the internal NPN power switch, reducing conduction loss. It requires an external boost capacitor (typically 1.5nF ceramic) connected between BOOST and VIN via a Schottky diode (e.g., MBRS330T3). This configuration ensures the switch operates with ~0.07Ω effective RON, enabling >89% efficiency.
Is the LT1506IS8-3.3#TRPBF RoHS compliant and halogen-free?
Yes, the LT1506IS8-3.3#TRPBF is RoHS compliant and halogen-free. The #TRPBF suffix explicitly denotes lead-free (Pb-free), RoHS-compliant packaging with matte tin finish, per Analog Devices' official product change notices and material declarations for the LT1506 family.
LT1506IS8-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 4.5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1506IS8-3.3#TRPBF FAQ
1.How can I place an order for LT1506IS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1506IS8-3.3#TRPBF 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 LT1506IS8-3.3#TRPBF reliable?
The price and inventory of LT1506IS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1506IS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1506IS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1506IS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1506IS8-3.3#TRPBF?
LT1506IS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1506IS8-3.3#TRPBF 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 LT1506IS8-3.3#TRPBF?
For technical support, including LT1506IS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1506IS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LT1506IS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1506IS8-3.3#TRPBF 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 LT1506IS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1506IS8-3.3#TRPBF?
All LT1506IS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1506IS8-3.3#TRPBF, 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 LT1506IS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT1506IS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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