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Analog Devices Inc. LT1506IR-SYNC#TRPBF
- Part No.:
- LT1506IR-SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1506IR-SYNC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4.5A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:3,320
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Product details
Overview
LT1506IR-SYNC#TRPBF from Analog Devices (formerly Linear Technology) is a 4.5A, 500kHz monolithic synchronous step-down switching regulator in SO-8 package with integrated NPN power switch, current-mode control, and external synchronization capability. It operates from 4V to 15V input, delivers fixed or adjustable output (this variant supports SYNC instead of SHDN), and targets portable computers and battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1506IR-SYNC#TRPBF datasheet, LT1506IR-SYNC#TRPBF pinout, LT1506IR-SYNC#TRPBF application, or LT1506IR-SYNC#TRPBF equivalent, key selection criteria include its 500kHz switching frequency, 0.07Ω switch on-resistance, 20µA shutdown current, cycle-by-cycle current limiting, and synchronization range up to 1MHz - all critical for low-noise, high-efficiency power supply design in space-constrained environments.
Technical Context
The LT1506IR-SYNC#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and peak-current sensing. Its bipolar NPN switch is driven via BOOST pin voltage boosting to ensure saturation, achieving low conduction loss (0.07Ω typ). The SYNC pin replaces SHDN and accepts logic-level signals (10–90% duty cycle) to synchronize the oscillator from 580kHz to 1MHz.
It features dual feedback paths: one for output regulation (via FB or SENSE pin) and another for real-time switch current monitoring. Internal slope compensation prevents subharmonic oscillation across 50–90% duty cycles, while foldback protection reduces switching frequency and current limit when FB voltage drops below 1V or 1.7V respectively - enhancing reliability under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 460–540 kHz (typ 500 kHz); enables compact magnetics and filtering |
| Max Output Current | 4.5 A at ≤50% duty cycle; derates nonlinearly above 50% due to slope compensation |
| Input Voltage Range | 4 V to 15 V; supports single-cell Li-ion and multi-cell battery inputs |
| Switch On Resistance | 0.07 Ω (typ); minimizes conduction loss and thermal rise at full load |
| Synchronization Range | 580 kHz to 1 MHz; allows EMI reduction via fixed-frequency coordination with system clock |
| Shutdown Current | 15–50 µA (typ 20 µA); extends battery life in standby mode |
| Feedback Accuracy | ±1.25% over temp (2.39–2.45 V ref); ensures tight output regulation for sensitive loads |
Pinout & Package
The LT1506IR-SYNC#TRPBF is housed in an 8-lead plastic SO package (SO-8) with fused GND pin connected to internal tab for enhanced thermal performance. Pin 1 is VIN; pin 2 is BOOST; pin 3 is GND; pin 4 is VSW; pin 5 is SYNC; pin 6 is VC; pin 7 is FB/SENSE; pin 8 is NC (no connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power collector | Supplies internal circuitry and powers NPN switch; requires low-inductance bypassing near pin |
| BOOST | Switch drive boost node | Accepts external capacitor-diode network to generate >VIN voltage for switch saturation |
| GND | Reference ground | Fused to internal tab; must connect to large copper area for thermal and EMI control |
| VSW | Switch emitter | Drives inductor; swings negative during off-time; clamped by external catch diode |
| SYNC | Oscillator sync input | Logic-compatible input (1.5–2.2 V threshold); replaces SHDN function in this variant |
| VC | Error amplifier output | Controls peak switch current; used for loop compensation or current clamp |
| FB/SENSE | Output voltage sense | 2.42 V reference point; for adjustable parts only - not used as SENSE in -SYNC variants |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and stable loop compensation without external type-II/III networks |
| Integrated BOOST drive | Reduces switch VCE(sat) to ~0.3 V at 4.5 A, improving efficiency over standard bipolar designs |
| Cycle-by-cycle current limiting | Prevents switch damage during overload or short-circuit by limiting peak current per switching cycle |
| Thermal shutdown | Protects die at TJ ≥ 125°C; auto-recovery after cooldown |
| Frequency foldback | Reduces switching frequency 5:1 when FB < 1 V, lowering power dissipation during fault conditions |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for low-power microcontrollers and FPGAs in clamshell notebooks. IC Role / Device Role / Timing Role: Primary buck converter delivering 3.3 V or adjustable output from 5–12 V battery input. Use Value: 500 kHz operation enables use of 1.8 µH inductors and small ceramic output caps, reducing board area by >40% vs lower-frequency alternatives. | Use Scenario: Power management in handheld medical monitors with strict battery life requirements. IC Role / Device Role / Timing Role: Main DC/DC regulator converting single Li-ion (3.0–4.2 V) to stable 3.3 V for analog front-end and digital logic. Use Value: 20 µA shutdown current extends runtime in sleep mode; SYNC pin allows noise-free alignment with data acquisition sampling clock. |
| Battery Charger | Distributed Power |
Use Scenario: Constant-current/constant-voltage charging stage for 2S Li-ion packs in portable tools. IC Role / Device Role / Timing Role: Adjustable-output buck controller regulating charger IC bias supply and gate drivers. Use Value: 4.5 A switch rating supports high-current charge paths; foldback current limiting prevents thermal runaway during cell mismatch faults. | Use Scenario: Point-of-load regulation in industrial IoT gateways with isolated 12 V backplane. IC Role / Device Role / Timing Role: Secondary-side buck converter generating 3.3 V for MCU, RF transceiver, and sensor interface. Use Value: Synchronization to master system clock eliminates beat frequencies and simplifies EMI filter design across multiple rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EFE#PBF | External MOSFET driver; supports higher Vin (4–38 V); no integrated switch | Used where >4.5 A output or wider input range required; needs external high-side FET | Select when designing for >15 V input or needing programmable current limit and phase synchronization |
| TPS54331DR | 3.5 A integrated buck; 570 kHz fixed freq; no SYNC pin; TI Eco-mode™ for light-load efficiency | Lower cost for ≤3.5 A loads; lacks synchronization and foldback protection | Choose for cost-sensitive consumer applications where EMI coordination is not required |
Compared with LTC3866EFE#PBF, LT1506IR-SYNC#TRPBF offers higher integration (integrated switch) and fault protection but lower current rating and input range; versus TPS54331DR, it provides superior short-circuit resilience and precise EMI control via SYNC, at the expense of light-load efficiency optimization.
Availability
LT1506IR-SYNC#TRPBF 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 traceable sourcing.
Supply support for LT1506IR-SYNC#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 its legacy power management portfolio with full technical documentation and application support.
The LT1506 series was designed specifically for high-efficiency, low-input-voltage DC/DC conversion in portable and battery-operated equipment, emphasizing compact size, thermal robustness, and fault tolerance without external complexity.
FAQ
What is the maximum input voltage rating for the LT1506IR-SYNC#TRPBF?
The absolute maximum input voltage for the LT1506IR-SYNC#TRPBF is 16 V. Operation beyond this level risks permanent damage to the internal NPN power switch and control circuitry. The recommended operating range remains 4 V to 15 V, with minimum input voltage dependent on output voltage and load current - for example, maintaining 3.3 V output requires ≥4.0 V input at light loads but may need ≥4.3 V under full load at low VIN.
Does the LT1506IR-SYNC#TRPBF support fixed 3.3 V output, or is it adjustable only?
The LT1506IR-SYNC#TRPBF is an adjustable-output variant - it retains the FB pin and does not integrate the 3.3 V feedback divider. To achieve fixed 3.3 V output, external resistors must be used to set the feedback voltage to 2.42 V. For factory-configured fixed 3.3 V operation, the part number LT1506IR-3.3-SYNC#TRPBF would be required instead.
How does the SYNC pin function differ from the SHDN pin in other LT1506 variants?
In the LT1506IR-SYNC#TRPBF, the SYNC pin replaces the SHDN pin found on standard variants. It accepts logic-level input (1.5–2.2 V threshold) to synchronize the internal oscillator from 580 kHz to 1 MHz. Unlike SHDN, it does not provide shutdown functionality - the device remains fully operational during synchronization, and no micropower state is entered. This enables deterministic EMI management without interrupting regulation.
What is the purpose of the BOOST pin, and what external components are required?
The BOOST pin on the LT1506IR-SYNC#TRPBF supplies elevated gate drive to saturate the internal NPN switch, reducing conduction loss. It requires an external bootstrap capacitor (typically 10–100 nF) and Schottky diode (e.g., MBRS330T3) connected between VIN and BOOST. During switch-on, the diode charges the capacitor to VIN + Vf; during switch-off, the capacitor discharges into the base drive, ensuring full saturation and 0.07 Ω on-resistance.
Can the LT1506IR-SYNC#TRPBF operate in discontinuous conduction mode (DCM)?
Yes, the LT1506IR-SYNC#TRPBF is explicitly designed to operate stably in both continuous and discontinuous conduction modes. Its current-mode architecture and slope compensation maintain loop stability regardless of inductor current waveform. DCM occurs naturally at light loads or with larger inductors, and the device automatically adjusts duty cycle and peak current without oscillation or regulation error - verified across temperature and line/load conditions in the datasheet's typical performance curves.
LT1506IR-SYNC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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):
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1506IR-SYNC#TRPBF FAQ
1.How can I place an order for LT1506IR-SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1506IR-SYNC#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 LT1506IR-SYNC#TRPBF reliable?
The price and inventory of LT1506IR-SYNC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1506IR-SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1506IR-SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1506IR-SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1506IR-SYNC#TRPBF?
LT1506IR-SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1506IR-SYNC#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 LT1506IR-SYNC#TRPBF?
For technical support, including LT1506IR-SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1506IR-SYNC#TRPBF requirements.
6.How does Aetrix verify that LT1506IR-SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1506IR-SYNC#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 LT1506IR-SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1506IR-SYNC#TRPBF?
All LT1506IR-SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1506IR-SYNC#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 LT1506IR-SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LT1506IR-SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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