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Analog Devices Inc. LT1506CS8#PBF
- Part No.:
- LT1506CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1506CS8#PBF.pdf
- Description:
- IC REG BUCK ADJ 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:700
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Product details
Overview
LT1506CS8#PBF from Analog Devices (formerly Linear Technology) is a 4.5A, 500kHz monolithic buck switching regulator in SO-8 package, optimized for low-input-voltage applications (4V–15V). It integrates a saturated NPN power switch (0.07Ω RDS(on)-equivalent), current-mode control, cycle-by-cycle current limiting, and shutdown functionality. Used in portable computers and battery-powered systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1506CS8#PBF datasheet, LT1506CS8#PBF pinout, LT1506CS8#PBF application, or LT1506CS8#PBF equivalent, key selection factors include its 4V minimum input voltage, 3.3V fixed-output variant capability, 20µA shutdown current, 500kHz switching frequency with synchronization option, and thermal shutdown protection - all critical for space-constrained, battery-sensitive designs.
Technical Context
The LT1506CS8#PBF implements constant-frequency current-mode control using an internal 500kHz oscillator and peak-current sensing. Its bipolar NPN switch is driven via a BOOST pin to achieve saturation, reducing conduction loss to ~0.07Ω at 4.5A. The error amplifier (2000 µMho transconductance) drives the VC pin, which directly sets the switch current threshold.
It features dual-threshold shutdown (0.4V for micropower off, 2.38V for UVLO lockout), frequency foldback below 1V FB voltage, and slope compensation to prevent subharmonic oscillation at >50% duty cycle. Synchronization extends operating frequency up to 1MHz when SYNC replaces SHDN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 4.5A typical; sets maximum deliverable load current before foldback or shutdown |
| Switching Frequency | 460–540 kHz typical; enables small external inductors (e.g., 1.8µH) and tight transient response |
| Input Voltage Range | 4V to 15V; supports single-cell Li-ion (4.2V min) and 5V rail inputs without pre-regulation |
| Shutdown Current | 15–50 µA; preserves battery life in standby mode of portable systems |
| Feedback Voltage | 2.42 V ±1.25%; defines output regulation accuracy for adjustable versions |
| Sense Voltage (Fixed 3.3V) | 3.30 V ±1.5%; ensures stable 3.3V output without external resistor divider |
| Switch On Resistance | 0.07 Ω typical at 4.5A; minimizes conduction loss and thermal rise in SO-8 package |
Pinout & Package
LT1506CS8#PBF is housed in an 8-lead plastic SOIC (SO-8) package with fused GND pin attached to internal tab for enhanced thermal performance (θJA = 80°C/W). GND pin must be connected to large copper area for effective heat dissipation and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power switch collector & IC supply input | Carries high dI/dt; requires local bypass capacitor and short trace to minimize voltage spikes |
| BOOST | Boost capacitor drive node | Provides >VIN voltage to saturate NPN switch; enables 0.07Ω effective on-resistance |
| GND | Reference ground & thermal tab connection | Fused pin tied to internal tab; must connect to large copper pour for thermal and EMI control |
| VSW | Power switch emitter | Swings from VIN down to –0.8V; drives external catch diode and inductor |
| SYNC / SHDN | Logic-compatible sync input or shutdown control | On LT1506CS8#PBF: SHDN pin; <0.37V disables switching, <0.13V forces micropower mode |
| VC | Error amplifier output & current comparator input | Controls peak switch current; used for loop compensation or external override |
| FB / SENSE | Feedback reference or fixed-output sense node | LT1506CS8#PBF is adjustable version: FB pin accepts 2.42V reference for external divider |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent stability without complex compensation |
| BOOST-driven saturated switch | Achieves 0.07Ω effective on-resistance with bipolar process, improving efficiency over standard NPN |
| Cycle-by-cycle current limiting | Prevents switch damage during overload or short-circuit by limiting peak current per cycle |
| Frequency foldback under fault | Reduces switching frequency 5:1 when FB <1V, lowering power dissipation in IC and external components |
| Dual-threshold shutdown | Separate 2.38V UVLO and 0.4V deep-sleep thresholds enable precise input monitoring and ultra-low standby current |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for embedded controllers and peripherals in clamshell notebooks and tablets. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5V or single-cell Li-ion (4.2V–3.0V) to stable 3.3V or adjustable logic rail. Use Value: 4V minimum input allows operation down to near-end-of-discharge battery voltage; 20µA shutdown extends runtime in suspend mode. | Use Scenario: Power management in handheld test equipment, medical monitors, and IoT edge sensors. IC Role / Device Role / Timing Role: High-efficiency buck converter supplying microcontroller, ADC, and RF subsystems from primary battery. Use Value: 500kHz switching enables compact 1.8µH inductor and ceramic output caps; current-mode control maintains regulation during rapid load steps. |
| Battery Charger | Distributed Power |
Use Scenario: Auxiliary supply generation in multi-cell Li-ion charger ICs for system bias rails and display backlight drivers. IC Role / Device Role / Timing Role: Secondary DC/DC stage regulating charge-management logic and interface circuitry from main charging bus. Use Value: Thermal shutdown and cycle-by-cycle current limit protect against overtemperature during high-current charging phases. | Use Scenario: Local point-of-load regulation in industrial PLC I/O modules and telecom line cards with distributed 5V/12V backplanes. IC Role / Device Role / Timing Role: Compact, robust buck regulator delivering isolated 3.3V or 5V rails from shared intermediate bus. Use Value: SO-8 package with fused GND provides reliable thermal path in dense layouts; synchronization option avoids beat frequencies in multi-regulator systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EMSE#PBF | External MOSFET driver; no integrated switch; supports up to 40V input | Used where higher input voltage or higher efficiency at light loads is required | Choose LTC3866EMSE#PBF only if discrete FET control, wider VIN range, or better light-load efficiency is needed - not a drop-in replacement |
| TPS54331DR | 3.5A integrated buck; 3.5V–28V input; 570kHz fixed frequency; different pinout and compensation scheme | Targeted at industrial supplies with higher VIN tolerance and lower quiescent current (146µA) | TPS54331DR offers broader input range but lower current rating and no BOOST pin architecture - verify layout and loop stability changes |
Compared with LTC3866EMSE#PBF and TPS54331DR, the LT1506CS8#PBF delivers higher peak current (4.5A vs. 3.5A/external), unique BOOST-driven saturation for low-loss operation at 4V–15V, and integrated fault protection - making it optimal for compact, battery-fed 3.3V systems where size and low-VIN performance are prioritized.
Availability
LT1506CS8#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-term lifecycle support, and guaranteed authenticity.
Supply support for LT1506CS8#PBF 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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1506 series.
The LT1506 belongs to Linear's monolithic buck regulator product line, designed specifically for high-current, low-input-voltage DC/DC conversion in space-constrained portable and battery-operated equipment.
FAQ
What is the minimum input voltage supported by the LT1506CS8#PBF?
The LT1506CS8#PBF supports a minimum input voltage of 4.0V, guaranteed across temperature. This enables operation directly from partially discharged single-cell Li-ion batteries (down to ~3.4V under load) while maintaining regulation - a key advantage over earlier regulators like the LT1374, which requires ≥5.5V. The 4V spec is validated by internal bias regulation tests, not direct measurement.
Does the LT1506CS8#PBF have built-in short-circuit protection?
Yes, the LT1506CS8#PBF includes full cycle-by-cycle current limiting and thermal shutdown. During output short-circuit, it reduces switching frequency (foldback) and lowers peak current limit when the FB pin voltage drops below 1.7V, preventing destructive power dissipation. These protections operate without external components and are active across the full junction temperature range.
Can the LT1506CS8#PBF be synchronized to an external clock?
No - the LT1506CS8#PBF uses the standard SO-8 pinout with SHDN on pin 5. Synchronization requires the -SYNC variant (e.g., LT1506CS8#TRPBF-SYNC), where SYNC replaces SHDN. Attempting to drive a clock signal into the SHDN pin of the LT1506CS8#PBF will trigger shutdown instead of synchronization.
What is the purpose of the BOOST pin on the LT1506CS8#PBF?
The BOOST pin on the LT1506CS8#PBF provides a voltage higher than VIN to fully saturate the internal bipolar NPN power switch, achieving an effective on-resistance of 0.07Ω. This is implemented with an external boost capacitor and diode (e.g., MBRS330T3). Without BOOST, switch losses would increase significantly, reducing efficiency from >89% to ~75% at full load.
Is the LT1506CS8#PBF RoHS compliant and lead-free?
Yes, the LT1506CS8#PBF is RoHS compliant and lead-free. The "#PBF" suffix explicitly denotes Pb-free (lead-free) packaging per Analog Devices' product marking convention. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020.
LT1506CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 13.95V
- Current - Output:
- 4.5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1506CS8#PBF FAQ
1.How can I place an order for LT1506CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1506CS8#PBF 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 LT1506CS8#PBF reliable?
The price and inventory of LT1506CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1506CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1506CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1506CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1506CS8#PBF?
LT1506CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1506CS8#PBF 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 LT1506CS8#PBF?
For technical support, including LT1506CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1506CS8#PBF requirements.
6.How does Aetrix verify that LT1506CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1506CS8#PBF 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 LT1506CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1506CS8#PBF?
All LT1506CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1506CS8#PBF, 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 LT1506CS8#PBF part is unused and in its original packaging.
Return procedure for LT1506CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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