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Analog Devices Inc. LT1506CR#TRPBF
- Part No.:
- LT1506CR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1506CR#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4.5A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,411
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Product details
Overview
LT1506CR#TRPBF from Analog Devices (formerly Linear Technology) is a 4.5A, 500kHz monolithic step-down switching regulator in SO-8 package, featuring current-mode control, cycle-by-cycle current limiting, and 0.07Ω internal NPN switch on-resistance. It operates from 4V to 15V input and delivers adjustable output voltage with 2.42V feedback reference, optimized for portable computers and battery-powered systems.
For engineers reviewing the LT1506CR#TRPBF datasheet, LT1506CR#TRPBF pinout, LT1506CR#TRPBF application, or LT1506CR#TRPBF equivalent, key selection criteria include minimum 4V input operation, 500kHz fixed-frequency current-mode architecture, shutdown current of 20µA, boost-capacitor-driven saturation, and SO-8 thermal performance with fused GND pin.
Technical Context
The LT1506CR#TRPBF implements a constant-frequency current-mode buck topology with internal 4.5A NPN power switch, error amplifier (2000 µMho transconductance), and slope compensation to prevent subharmonic oscillation at duty cycles above 50%. Its BOOST pin enables saturation drive, reducing switch voltage drop to ~0.3V at 4.5A.
It features dual-threshold shutdown (0.4V full shutdown, 2.38V UVLO lockout), FB pin-based frequency foldback below 1V, and programmable current limit via VC pin. Synchronization capability (580kHz–1MHz range) is disabled on this variant-SHDN pin is present, not SYNC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 4.5A typical; sets maximum deliverable load current before foldback or shutdown |
| Switch On Resistance | 0.07Ω typical; enables low conduction loss and >89% efficiency at 4.5A |
| Feedback Reference Voltage | 2.42V ±0.03V; defines output voltage via external resistor divider (VOUT = 2.42 × (1 + R1/R2)) |
| Switching Frequency | 500kHz ±40kHz; enables compact 1.8µH inductor and reduces EMI fundamental |
| Input Voltage Range | 4V to 15V; supports single-cell Li-ion (4.2V min) and 5V/12V rail inputs without pre-regulation |
| Shutdown Supply Current | 20µA typical; allows ultra-low-power standby in battery-critical applications |
| Thermal Shutdown Threshold | 125°C junction; protects device during overload or poor PCB heatsinking |
Pinout & Package
LT1506CR#TRPBF is housed in an 8-lead plastic SO package (SO-8) with fused GND pin connected to internal tab for enhanced thermal dissipation. θJA = 80°C/W with standard PCB layout; GND pin must be soldered to large copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power switch collector & IC supply input | Connects to input source; high dI/dt node requiring local bypass capacitor and short trace to GND |
| BOOST | Switch driver bootstrap supply | Must be biased 5V above VIN via external capacitor/diode to saturate NPN switch and minimize VCE(sat) |
| GND | Reference ground & thermal pad | Fused internal tab; requires direct connection to large PCB copper plane for thermal and noise control |
| VSW | Switch emitter output | Drives inductor; swings negative during off-time-requires catch diode clamping to −0.8V max |
| SHDN | Enable/disable control input | Logic-compatible; 0V = active shutdown (20µA IQ); 2.38V = UVLO lockout; 0.4V = full micropower mode |
| VC | Error amplifier output & current comparator input | Used for loop compensation; also serves as current clamp point (0.9V threshold, 2.1V clamp) |
| FB | Feedback voltage sense input | Monitors resistive divider; 2.42V reference enables precise adjustable output; enables foldback below 1.7V |
| NC | No connect | Pin 1 is unconnected-no internal circuitry attached; leave floating or omit from PCB footprint |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response and inherent stability across wide duty cycle range without external compensation |
| Boost-driven NPN switch | Achieves 0.07Ω effective on-resistance and >89% peak efficiency-superior to conventional bipolar designs |
| Programmable current limit | VC pin allows external override of peak switch current, enabling custom current limiting or soft-start |
| Frequency foldback protection | Reduces switching frequency 5:1 when FB < 1V, limiting power dissipation during short-circuit or start-up faults |
| Dual-threshold shutdown | Separate 2.38V (UVLO) and 0.4V (deep shutdown) thresholds enable robust input monitoring and battery preservation |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for low-power x86 or ARM processors in clamshell notebooks with Li-ion battery input. IC Role / Device Role / Timing Role: Primary step-down converter delivering 1.2V–3.3V at up to 4.5A with tight load transient response. Use Value: 4V minimum input enables operation down to depleted Li-ion (3.0V pack = ~4.2V at VIN after protection FET), extending runtime. | Use Scenario: Power management in handheld test equipment powered by 4×AA alkaline or single-cell LiFePO₄. IC Role / Device Role / Timing Role: Main DC/DC converter generating 3.3V system rail from variable 4.5V–12V input. Use Value: 20µA shutdown current preserves battery life during extended sleep modes without external load switches. |
| Battery Charger | Distributed Power |
Use Scenario: Constant-current/constant-voltage stage in multi-chemistry smart charger for 2S Li-ion packs. IC Role / Device Role / Timing Role: Adjustable-output buck regulator controlling charge current via feedback loop modulation. Use Value: Cycle-by-cycle current limiting ensures precise CC regulation and prevents overcurrent damage during cell impedance shifts. | Use Scenario: Local point-of-load conversion in industrial I/O modules with 12V backplane input. IC Role / Device Role / Timing Role: Compact 5V-to-3.3V or 5V-to-2.5V regulator on dense PCBs where space and thermal budget are constrained. Use Value: SO-8 fused-GND package with 80°C/W θJA supports 3.5A continuous output without heatsink in 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EMSE#TRPBF | Higher 600kHz switching frequency; MOSFET drivers; no integrated switch; requires external FETs | Designed for higher-efficiency, higher-current (>10A) applications with external power stage flexibility | Select when needing >5A output or synchronous rectification; not drop-in due to external FET requirement |
| TPS54331DR | 3.5A integrated switch; 570kHz frequency; 3.5V–28V input; different pinout and compensation scheme | Optimized for cost-sensitive industrial supplies; lacks BOOST pin and foldback protection | Select for wider input range and lower BOM cost; verify loop stability and fault behavior differ significantly |
Compared with LTC3850EMSE#TRPBF and TPS54331DR, the LT1506CR#TRPBF offers unique BOOST-driven NPN saturation for lowest conduction loss at 4.5A in SO-8, but requires external catch diode and lacks synchronous rectification-making it ideal for compact, medium-current, cost-optimized battery-fed designs where thermal headroom is limited.
Availability
LT1506CR#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed SO-8 packaging consistency.
Supply support for LT1506CR#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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1506 series.
The LT1506CR#TRPBF belongs to Linear's monolithic current-mode buck regulator family, designed specifically for high-efficiency, low-input-voltage DC/DC conversion in space-constrained portable and battery-operated equipment.
FAQ
What is the minimum input voltage required for stable operation of the LT1506CR#TRPBF?
The LT1506CR#TRPBF guarantees stable regulation down to 4.0V input (typical 4.3V), enabled by internal bias regulation and BOOST pin functionality. Below 4V, reference voltage and oscillator frequency may drift. For 3.3V output, minimum VIN depends on load: at 4.5A it is ~4.4V; at light loads, operation can sustain near 4.0V. Always verify with actual board layout and thermal conditions.
Does the LT1506CR#TRPBF support synchronization to an external clock?
No, the LT1506CR#TRPBF does not support synchronization. It features SHDN pin functionality only. Synchronization is available only on variants marked "-SYNC" (e.g., LT1506CR-SYNC), which replace SHDN with SYNC pin. Using an external clock signal on the SHDN pin of LT1506CR#TRPBF will cause unintended shutdown-not synchronization.
What is the purpose of the BOOST pin on the LT1506CR#TRPBF, and how must it be connected?
The BOOST pin on the LT1506CR#TRPBF provides elevated gate drive to saturate the internal NPN switch, reducing VCE(sat) to ~0.3V at 4.5A. It must be connected to a capacitor charged to VIN + 5V via a Schottky diode (e.g., MBRS330T3). The capacitor value is typically 10nF–100nF ceramic; improper BOOST voltage (<2.3V above VIN) causes increased conduction loss and thermal stress on LT1506CR#TRPBF.
Can the LT1506CR#TRPBF be used to generate a fixed 3.3V output without external resistors?
No-the LT1506CR#TRPBF is the adjustable-output version with FB pin. Fixed 3.3V output requires the LT1506CR-3.3 variant, which replaces FB with SENSE pin internally tied to the 3.3V reference. Using LT1506CR#TRPBF for 3.3V requires a precision resistor divider (R1/R2) targeting 2.42V at FB, with R2 ≤ 5kΩ to minimize bias current error.
What thermal considerations apply to the LT1506CR#TRPBF in SO-8 package?
The LT1506CR#TRPBF SO-8 package uses a fused GND pin directly bonded to the internal thermal tab. To achieve rated 4.5A output, the GND pad must be soldered to ≥1 square inch of 2oz copper on inner or outer layer, with multiple thermal vias to internal ground planes. Without this, θJA degrades from 80°C/W to >120°C/W, risking thermal shutdown at >2.5A continuous load in 50°C ambient.
LT1506CR#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1506CR#TRPBF FAQ
1.How can I place an order for LT1506CR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1506CR#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 LT1506CR#TRPBF reliable?
The price and inventory of LT1506CR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1506CR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1506CR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1506CR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1506CR#TRPBF?
LT1506CR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1506CR#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 LT1506CR#TRPBF?
For technical support, including LT1506CR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1506CR#TRPBF requirements.
6.How does Aetrix verify that LT1506CR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1506CR#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 LT1506CR#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1506CR#TRPBF?
All LT1506CR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1506CR#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 LT1506CR#TRPBF part is unused and in its original packaging.
Return procedure for LT1506CR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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