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Analog Devices Inc. LT1507CS8#TRPBF
- Part No.:
- LT1507CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1507CS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,994
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Product details
Overview
LT1507CS8#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck-mode switching regulator in an 8-lead SOIC package, designed for step-down conversion from 4V–15V input to fixed 3.3V output at up to 1.25A. It integrates a 1.5A NPN power switch with 0.3Ω on-resistance, current-mode control, and cycle-by-cycle current limiting-enabling compact, high-efficiency DC/DC conversion in portable computing and battery-powered systems.
For engineers reviewing the LT1507CS8#TRPBF datasheet, LT1507CS8#TRPBF pinout, LT1507CS8#TRPBF application, or LT1507CS8#TRPBF equivalent, this page delivers verified technical context, exact pin functions, real-world efficiency curves (≥85% at 1.25A/3.3V), thermal shutdown protection, and validated alternatives for 3.3V point-of-load regulation.
Technical Context
The LT1507CS8#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and dual feedback loops: one for voltage regulation via the error amplifier (VC pin), and another for cycle-by-cycle peak current sensing via the SENSE pin. Its bipolar NPN switch is driven by a BOOST-capacitor-assisted gate drive, enabling saturation and low conduction loss (0.3Ω typical).
It features two independent shutdown thresholds: 2.38V for undervoltage lockout (UVLO) and 0.4V for micropower shutdown (20µA quiescent current). The SYNC pin supports external synchronization from 580kHz to 1MHz, and the FB/SENSE pin provides foldback current limiting and frequency reduction during short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz nominal (460–540kHz over temperature); enables use of small inductors (as low as 2µH) and reduces filter component size. |
| Output Voltage | Fixed 3.3V ±1.5% (3.25–3.35V); internally trimmed reference eliminates external resistor divider in standard applications. |
| Max Output Current | 1.25A continuous (at VIN=5V, VOUT=3.3V); limited by internal 1.5A switch and thermal design with θJA = 120°C/W. |
| Input Voltage Range | 4V to 15V; minimum start-up voltage is ~4.3V, supporting operation down to 1V above output under load. |
| Efficiency | ≥85% at 1.25A/3.3V (VIN=5V); achieved via saturated NPN switch and 4mA quiescent supply current. |
| Shutdown Current | 20µA typical (15–50µA); enables long battery life in standby mode without external disconnect circuitry. |
| Thermal Protection | Full-cycle thermal shutdown at TJ ≥ 125°C; automatically recovers after cooldown-no latch required. |
Pinout & Package
LT1507CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm, with standard JEDEC MS-012AC footprint and 1.27mm pitch. Thermal resistance θJA = 120°C/W (dependent on PCB layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Switch driver boost supply | Accepts external capacitor to generate >VIN voltage; enables NPN saturation and 0.3Ω effective RDS(on). |
| VIN (Pin 2) | Main power input | Supplies bias and switch current; operates from 4V–15V; requires local 0.1µF ceramic bypass. |
| VSW (Pin 3) | Internal switch collector | Swings from VIN to ~–0.7V (clamped by catch diode); drives external inductor and catch diode node. |
| SHDN (Pin 4) | Enable/disable control | Logic-compatible input: >2.38V = UVLO active; <0.4V = full shutdown (20µA IQ). |
| SYNC (Pin 5) | External clock synchronization | Accepts TTL/CMOS logic signal (10–90% duty); locks internal oscillator from 580kHz to 1MHz. |
| GND (Pin 6) | Power and signal reference | Common return for VIN, BOOST, SHDN, and SENSE; must be low-impedance plane for stability. |
| FB/SENSE (Pin 7) | Output voltage sense | Direct connection to 3.3V output; triggers foldback current limit when voltage drops below 1.5V. |
| VC (Pin 8) | Error amplifier output | Drives peak current comparator; used for compensation (type II/III), current clamping, or loop override. |
Key Features
| Feature | Design Value |
|---|---|
| 500kHz fixed-frequency operation | Enables consistent EMI profile and predictable filter design; avoids audible noise and simplifies compliance testing. |
| Saturated NPN switch (0.3Ω) | Reduces conduction loss vs. conventional bipolar designs-improves efficiency by >15% at full load. |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting, fast transient response, and stable loop compensation without slope compensation below 700kHz. |
| Two-threshold shutdown (UVLO + deep sleep) | Eliminates need for external supervisor IC: 2.38V threshold prevents startup until input is valid; 0.4V threshold cuts IQ to 20µA. |
| Frequency and current foldback | Under short-circuit, reduces switching frequency ~5:1 and limits peak current to <1A-protecting IC, diode, and inductor. |
Applications
| Portable Computing Power Rails | Battery-Powered System Core Supply |
|---|---|
Use Scenario: Generating 3.3V main logic rail from single-cell Li-ion (4.2V) or 5V USB input in ultraportable laptops and tablets. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 3.3V at up to 1.25A with tight load transient response. Use Value: High 500kHz switching allows compact 5µH inductor and low-profile tantalum output capacitors-reducing board area by >30% vs. 100kHz solutions. |
Use Scenario: Powering microcontrollers, sensors, and RF modules in handheld medical devices and IoT edge nodes. IC Role / Device Role / Timing Role: Efficient step-down regulator operating across wide battery discharge range (4.2V → 3.4V). Use Value: 20µA shutdown current extends battery runtime; UVLO prevents brownout-induced MCU resets during low-battery operation. |
| Distributed Point-of-Load Regulation | Industrial Sensor Node Power |
Use Scenario: Local 3.3V supply for FPGA I/O banks or ADC/DAC interfaces in multi-rail industrial controllers. IC Role / Device Role / Timing Role: Isolated buck stage decoupled from system 5V/12V bus, minimizing noise coupling into analog sections. Use Value: Current-mode control rejects input ripple; BOOST-driven switch ensures stable regulation even with 100mV input droop at 1.25A load. |
Use Scenario: Powering low-power wireless sensor transceivers (e.g., BLE, LoRa) in harsh environments requiring extended temperature operation. IC Role / Device Role / Timing Role: Robust 3.3V regulator rated for –40°C to 85°C ambient, with thermal shutdown and short-circuit foldback. Use Value: Full-cycle thermal shutdown prevents damage during prolonged overload; foldback protects external components during field wiring faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1375CS8#TRPBF | Wider input range (5.5V–25V); higher min VIN (5.5V vs. 4V); same 500kHz, 1.5A switch, SO-8 package. | Not suitable for sub-5.5V inputs (e.g., single Li-ion); better for 12V/24V industrial rails. | Select LT1375CS8#TRPBF only if input exceeds 5.5V and 3.3V output is required-otherwise LT1507CS8#TRPBF offers superior low-VIN performance. |
| TPS54331DR | 3.5V–28V input; 3.5A switch; 570kHz–750kHz adjustable frequency; integrated MOSFET; different pinout and compensation scheme. | Higher current capability but larger solution size; requires external compensation and different layout rules. | Choose TPS54331DR for >1.5A loads or wider input range; avoid for space-constrained 1.25A designs where LT1507CS8#TRPBF's proven 8-pin SOIC layout suffices. |
Compared with LT1375CS8#TRPBF, LT1507CS8#TRPBF delivers usable regulation down to 4V input-critical for battery-fed systems-while maintaining identical package, pinout, and control architecture. Against TPS54331DR, it trades higher current for smaller footprint, lower BOM count, and simpler compensation, making it optimal for cost- and size-sensitive 3.3V/1.25A applications.
Availability
LT1507CS8#TRPBF is available at Aetrix Electronics and suitable for portable computing, battery-powered instrumentation, and distributed power management requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing.
Supply support for LT1507CS8#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LT1507CS8#TRPBF belongs to Linear's legacy monolithic buck regulator family, engineered specifically for high-efficiency, low-input-voltage DC/DC conversion in space-constrained portable and battery-operated equipment.
FAQ
What is the maximum continuous output current of the LT1507CS8#TRPBF?
The LT1507CS8#TRPBF delivers up to 1.25A continuous output current at 3.3V with VIN = 5V, based on thermal limits (θJA = 120°C/W) and internal 1.5A switch rating. Derating is required above 5V input or at elevated ambient temperatures-see the "Maximum Load Current" graphs in the official datasheet for precise derating curves.
Does the LT1507CS8#TRPBF require an external feedback resistor divider?
No. The LT1507CS8#TRPBF is the fixed 3.3V version: its FB/SENSE pin connects directly to the output and uses on-die resistors for regulation. External dividers are only needed for adjustable variants like LT1507CS8-ADJ. Using a divider with LT1507CS8#TRPBF will cause regulation error and instability.
Can the LT1507CS8#TRPBF be synchronized to an external clock?
Yes. The LT1507CS8#TRPBF supports external synchronization via its SYNC pin (Pin 5), accepting logic-level signals from 580kHz to 1MHz with 10–90% duty cycle. This allows EMI reduction through frequency dithering or alignment with system clocks-no additional components are required beyond the driving source.
What is the purpose of the BOOST pin on the LT1507CS8#TRPBF?
The BOOST pin (Pin 1) supplies an elevated voltage to the internal NPN switch driver, enabling saturation and reducing effective on-resistance to 0.3Ω. It requires an external flying capacitor (e.g., 3.3nF) and catch diode (e.g., 1N914); omitting this network degrades efficiency by ~15% and increases thermal stress on the LT1507CS8#TRPBF die.
How does the LT1507CS8#TRPBF handle short-circuit conditions?
The LT1507CS8#TRPBF employs dual protection: cycle-by-cycle current limiting (1.5A peak) plus foldback behavior. When SENSE voltage drops below 1.5V, peak current folds back; below 1V, switching frequency reduces ~5:1. This limits power dissipation in both the LT1507CS8#TRPBF and external components during sustained shorts-without requiring external current-sense resistors.
LT1507CS8#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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1507CS8#TRPBF FAQ
1.How can I place an order for LT1507CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1507CS8#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 LT1507CS8#TRPBF reliable?
The price and inventory of LT1507CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1507CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1507CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1507CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1507CS8#TRPBF?
LT1507CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1507CS8#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 LT1507CS8#TRPBF?
For technical support, including LT1507CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1507CS8#TRPBF requirements.
6.How does Aetrix verify that LT1507CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1507CS8#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 LT1507CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1507CS8#TRPBF?
All LT1507CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1507CS8#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 LT1507CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1507CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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