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Analog Devices Inc. LT1507CN8#PBF
- Part No.:
- LT1507CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1507CN8#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
LT1507CN8#PBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck mode switching regulator in an 8-lead PDIP package, designed for 4V to 15V input and delivering up to 1.25A at 3.3V fixed output with 0.3Ω switch on-resistance, 85%+ efficiency at 1.25A, and cycle-by-cycle current limiting. It serves as a compact, high-efficiency DC/DC step-down converter in portable computing and battery-powered systems.
For engineers reviewing the LT1507CN8#PBF datasheet, LT1507CN8#PBF pinout, LT1507CN8#PBF application, or LT1507CN8#PBF equivalent, key selection considerations include its fixed 3.3V output configuration, 500kHz constant-frequency current-mode control, shutdown current of 20µA, thermal shutdown protection, and compatibility with standard surface-mount inductors down to 2µH.
Technical Context
The LT1507CN8#PBF implements a current-mode, constant-frequency buck topology with an internal 1.5A NPN power switch and external BOOST capacitor-assisted saturation drive, enabling low conduction loss (0.3Ω typical). Its dual-threshold shutdown pin provides both undervoltage lockout (2.38V) and deep micropower shutdown (0.4V).
Feedback is implemented via internal resistor divider for fixed 3.3V output (SENSE pin), while VC pin serves as error amplifier output and current limit threshold control point. Frequency foldback and current limit foldback activate below 1.5V and 1V on SENSE, respectively, enhancing short-circuit robustness without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz ±40kHz - enables compact magnetics and reduces EMI filtering burden. |
| Output Voltage | 3.3V ±1.5% - fixed, internally trimmed; eliminates external feedback resistors. |
| Max Output Current | 1.25A - limited by thermal design and inductor selection; supports portable system rails. |
| Input Voltage Range | 4V to 15V - optimized for single-cell Li-ion + boost or 5V bus applications. |
| Switch On Resistance | 0.3Ω typical - achieved via BOOST pin drive; reduces conduction loss vs. standard bipolar designs. |
| Shutdown Current | 20µA - enables long battery life in standby; triggered at SHDN < 0.4V. |
| Thermal Shutdown | 125°C junction - protects against sustained overload or poor heatsinking. |
Pinout & Package
LT1507CN8#PBF is housed in an 8-lead plastic DIP (PDIP) package with 0.3-inch width, through-hole compatible, rated for 0°C to 70°C ambient operation. Pin 1 is BOOST; pin 2 is VIN; pin 3 is VSW; pin 4 is SHDN; pin 5 is SYNC; pin 6 is GND; pin 7 is FB/SENSE; pin 8 is VC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Charge pump drive node | Supplies >VIN voltage to saturate internal NPN switch; requires external diode + capacitor. |
| VIN (2) | Main power input | Accepts 4V–15V; powers bias circuitry and switch driver; bypass with ≥10µF ceramic. |
| VSW (3) | Switch collector node | Connects to inductor; swings from VIN to ~–0.7V during off-time; requires catch diode to GND. |
| SHDN (4) | Enable/disable control | Two thresholds: 2.38V (UVLO) and 0.4V (full shutdown); logic-compatible with open-collector drivers. |
| SYNC (5) | External clock input | Accepts 570kHz–1MHz logic-level signal; overrides internal oscillator for EMI reduction or multi-rail synchronization. |
| GND (6) | Power and signal reference | Common return for VIN, BOOST, VSW catch diode, and feedback path; must be low-impedance. |
| FB/SENSE (7) | Output voltage sense | Internally connected to 3.3V divider; monitors output directly; enables foldback protection below 1.5V. |
| VC (8) | Error amplifier output | Controls peak switch current; used for compensation (type II/III), current clamping, or loop override. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external feedback resistors and associated layout sensitivity; improves production yield and stability. |
| Saturated NPN switch | 0.3Ω on-resistance reduces conduction loss and heat generation vs. conventional bipolar regulators. |
| Current-mode control | Provides inherent cycle-by-cycle overcurrent protection and fast transient response without external slope compensation. |
| Frequency foldback | Reduces switching frequency 5:1 when SENSE < 1V, lowering power dissipation during short-circuit faults. |
| Inductor flexibility | Supports 2µH–10µH surface-mount inductors; enables trade-offs between size, ripple, and peak current handling. |
Applications
| Portable Computing Power Rail | Battery-Powered IoT Node |
|---|---|
Use Scenario: Generating stable 3.3V supply for microcontroller, memory, and sensors in handheld devices with Li-ion or alkaline battery input. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator converting 4.5V–9V battery voltage to regulated 3.3V system rail. Use Value: High 85%+ efficiency across 0.1A–1.25A load range extends runtime; 20µA shutdown current preserves battery during sleep modes. | Use Scenario: Powering ultra-low-power wireless sensor nodes operating from coin-cell or small Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Efficient buck converter enabling direct battery-to-3.3V conversion without intermediate LDO stages. Use Value: 4V minimum input allows operation down to near-dead battery; thermal shutdown prevents damage during intermittent high-current RF bursts. |
| Distributed Power Subsystem | Battery Charger Auxiliary Supply |
Use Scenario: Providing isolated 3.3V logic supply in industrial PLC modules where main 12V/24V bus powers multiple subsystems. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling noise-sensitive digital circuits from noisy power bus. Use Value: 500kHz switching minimizes filter component size; SYNC pin allows alignment with master clock to reduce beat frequencies. | Use Scenario: Generating 3.3V bias for charger management IC, status LEDs, and USB interface in single-cell Li-ion chargers. IC Role / Device Role / Timing Role: Secondary regulator powered from charger IC's 5V output or battery input during charging phases. Use Value: Fixed 3.3V output ensures consistent logic levels; shutdown pin ties to charger enable signal for coordinated power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 4MHz synchronous buck, 3.3V fixed, 1.2A, integrated MOSFETs; no BOOST pin required. | Higher frequency enables smaller inductors/caps but increases switching loss at high load. | Preferred for space-constrained designs where efficiency >85% at light loads matters more than cost. |
| TPS54331DR | 3.5V–28V input, adjustable output, 3A capability, external compensation; no fixed 3.3V variant. | Wider input range suits 12V/24V systems; requires external feedback resistors and compensation network. | Chosen when design needs flexibility across multiple output voltages or higher current headroom. |
Compared with LTC3605EDE#TRPBF and TPS54331DR, the LT1507CN8#PBF offers lower BOM count for fixed 3.3V use, proven reliability in legacy industrial designs, and superior thermal performance at 1.25A due to its saturated bipolar switch architecture-making it optimal for cost-sensitive, thermally constrained 4V–15V applications.
Availability
LT1507CN8#PBF is available at Aetrix Electronics and suitable for portable computing, battery-powered IoT nodes, distributed power subsystems, and battery charger auxiliary supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for LT1507CN8#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 its portfolio of high-performance analog and power management ICs with emphasis on precision, reliability, and ruggedness.
The LT1507CN8#PBF belongs to Linear's monolithic switching regulator product line, engineered specifically for high-efficiency, low-input-voltage DC/DC conversion in portable and battery-operated equipment where thermal management and board space are critical.
FAQ
What is the maximum output current capability of the LT1507CN8#PBF?
The LT1507CN8#PBF delivers up to 1.25A continuous output current at 3.3V under typical conditions (VIN = 5V, TA = 25°C, adequate PCB copper area). This is limited by internal switch current rating (1.5A typ), thermal rise, and external inductor saturation current. Derating is required above 70°C ambient or with poor thermal layout.
Does the LT1507CN8#PBF require an external BOOST capacitor?
Yes, the LT1507CN8#PBF requires an external BOOST capacitor (e.g., 3.3nF ceramic) and diode (e.g., 1N914) connected between VIN and BOOST (Pin 1) to generate a voltage higher than VIN. This drives the internal NPN switch into saturation, achieving the specified 0.3Ω on-resistance and high efficiency.
Can the LT1507CN8#PBF be synchronized to an external clock?
Yes, the LT1507CN8#PBF supports external synchronization via the SYNC pin (Pin 5), accepting logic-level signals from 570kHz to 1MHz. This allows EMI reduction through frequency dithering or alignment with system clocks-critical in noise-sensitive mixed-signal applications.
What protection features are built into the LT1507CN8#PBF?
The LT1507CN8#PBF integrates full cycle-by-cycle current limiting, thermal shutdown at 125°C junction temperature, undervoltage lockout (2.38V on SHDN), and foldback current/frequency reduction when SENSE voltage drops below 1.5V or 1V-providing robust fault tolerance without external components.
Is the LT1507CN8#PBF pin-compatible with other members of the LT1507 family?
Yes, all LT1507 variants-including LT1507CN8#PBF, LT1507CS8#PBF, and LT1507IN8#PBF-share identical pinouts across PDIP (N8) and SO (S8) packages. The only differences are output voltage (fixed 3.3V vs. adjustable), temperature grade (C/I), and package type; no PCB redesign is needed when substituting within the same package.
LT1507CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 16V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 14.88V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1507CN8#PBF FAQ
1.How can I place an order for LT1507CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1507CN8#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 LT1507CN8#PBF reliable?
The price and inventory of LT1507CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1507CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1507CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1507CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1507CN8#PBF?
LT1507CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1507CN8#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 LT1507CN8#PBF?
For technical support, including LT1507CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1507CN8#PBF requirements.
6.How does Aetrix verify that LT1507CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1507CN8#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 LT1507CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1507CN8#PBF?
All LT1507CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1507CN8#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 LT1507CN8#PBF part is unused and in its original packaging.
Return procedure for LT1507CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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