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Analog Devices Inc. LT1507IS8#TRPBF
- Part No.:
- LT1507IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1507IS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,430
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Product details
Overview
LT1507IS8#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck-mode switching regulator in an 8-lead SOIC package, designed for 4V to 15V input and delivering up to 1.25A at fixed 3.3V output with 85%+ efficiency, cycle-by-cycle current limiting, and thermal shutdown-used in portable computers and battery-powered systems.
For engineers reviewing the LT1507IS8#TRPBF datasheet, LT1507IS8#TRPBF pinout, LT1507IS8#TRPBF application, or LT1507IS8#TRPBF equivalent, key selection criteria include its fixed 3.3V output, 0.3Ω switch on-resistance, 20µA shutdown current, -40°C to 85°C industrial temperature range, and external synchronization capability from 580kHz to 1MHz.
Technical Context
The LT1507IS8#TRPBF implements current-mode control with a 500kHz fixed-frequency oscillator and internal NPN power switch, enabling fast transient response and stable loop compensation. Its BOOST pin drives the switch into saturation using an external capacitor-diode network, reducing conduction loss to that of a 0.3Ω FET.
It features dual shutdown thresholds (2.38V UVLO and 0.4V deep shutdown), frequency foldback below 1V FB/SENSE voltage, and foldback current limiting below 1.5V SENSE voltage-both protecting external components during short-circuit conditions without requiring external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz ±40kHz; enables compact 2–5µH inductors and low-profile designs. |
| Output Voltage | Fixed 3.3V ±1.5%; no external feedback divider required-simplifies layout and improves accuracy. |
| Max Output Current | 1.25A continuous; limited by thermal design and inductor saturation, not just switch rating. |
| Switch On Resistance | 0.3Ω typical; achieved via BOOST-assisted saturation-reduces conduction loss vs. standard bipolar switches. |
| Shutdown Current | 20µA max; enables long battery life in standby mode for portable systems. |
| Input Voltage Range | 4V to 15V; supports single-cell Li-ion (4.2V) and multi-cell alkaline/NiMH inputs. |
| Operating Temp Range | –40°C to +85°C; qualified for industrial environments without derating. |
| Synchronization Range | 580kHz to 1MHz; allows EMI reduction via external clock alignment. |
Pinout & Package
LT1507IS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with standard 1.27mm pitch and JEDEC MS-012AC outline. Thermal resistance θJA = 120°C/W (typical, depending on PCB layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Switch drive boost supply | Accepts external capacitor-diode network to generate >VIN voltage-ensures NPN switch saturation and low VCE(sat). |
| VIN (2) | Main power input | Supplies bias and switch current; operates from 4V–15V-supports wide-input battery and distributed power rails. |
| VSW (3) | Internal switch collector | Swings from VIN to ~–0.7V (clamped by catch diode); requires external Schottky diode to GND. |
| SHDN (4) | Shutdown control | Two-threshold logic: ≥2.38V disables switching (UVLO), ≤0.4V forces micropower shutdown (20µA IQ). |
| SYNC (5) | External clock input | Logic-level compatible; synchronizes internal oscillator from 580kHz–1MHz-reduces EMI peak emissions. |
| GND (6) | Power and signal reference | Common return for VIN, BOOST, SHDN, SYNC, and SENSE-must be low-impedance plane for stability. |
| FB/SENSE (7) | Output voltage sense | Internally connected to 3.3V output; monitors regulation and triggers foldback protection below 1.5V. |
| VC (8) | Error amplifier output | Drives peak-current comparator; used for compensation, current clamping, or override-sets at 1V–2V under load. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables inherent cycle-by-cycle current limiting and stable operation with ceramic or tantalum output capacitors. |
| BOOST-assisted saturation | Reduces effective switch resistance to 0.3Ω-improves efficiency over conventional bipolar regulators by >15% at full load. |
| Frequency foldback | Reduces switching frequency 5:1 when SENSE <1V-limits power dissipation in IC and catch diode during short-circuit events. |
| Inductor flexibility | Supports 2µH–10µH surface-mount inductors-enables trade-offs between size, ripple, and thermal performance. |
| Industrial temperature grade | Rated for –40°C to +85°C ambient-validated for use in automotive infotainment, industrial HMIs, and outdoor IoT nodes. |
| Surface-mount compatibility | SOIC-8 footprint aligns with standard reflow profiles-no lead-forming or through-hole assembly required. |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Step-down conversion from 5V USB or Li-ion battery (4.2V) to clean 3.3V rail for microcontrollers and sensors in handheld test equipment. IC Role / Device Role / Timing Role: Primary DC/DC regulator providing regulated 3.3V at up to 1.25A with fast load transient response. Use Value: 85%+ efficiency extends battery runtime; 20µA shutdown current preserves charge during sleep modes. | Use Scenario: Powering low-power ADCs, op-amps, and wireless transceivers in field-deployable environmental sensors. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering stable 3.3V under varying battery voltage (4V–15V) and temperature (–40°C to +85°C). Use Value: Built-in UVLO prevents brownout operation; thermal shutdown protects against enclosure overheating. |
| Distributed Power Architecture | Battery Charger Auxiliary Supply |
Use Scenario: Local point-of-load regulation on PCBs with multiple voltage domains, fed from a shared 5V or 12V backplane. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator eliminating need for external feedback resistors or compensation networks. Use Value: SOIC-8 footprint simplifies layout; 500kHz switching minimizes filter component size and cost. | Use Scenario: Generating isolated 3.3V bias for charger controller ICs and status LEDs in multi-cell Li-ion charging modules. IC Role / Device Role / Timing Role: Secondary-side regulator powered from auxiliary winding or main DC bus-immune to primary-side noise. Use Value: Foldback current limiting prevents thermal runaway during charger fault conditions (e.g., cell open-circuit). |
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, 2.7V–5.5V input | Higher frequency enables smaller inductors/caps but narrower input range; no BOOST pin or external diode needed | Select for space-constrained designs where input is tightly regulated 3.3V–5V; avoid if input may dip below 2.7V or exceed 5.5V |
| TPS54331DR | 3.5MHz adjustable buck, 3A, integrated high-side FET, 3.5V–28V input, requires external feedback divider | Wider input range and higher current, but lacks fixed 3.3V option and foldback protection | Select when adjustable output or >1.25A is required; add external resistor divider and verify short-circuit behavior |
Compared with LTC3605EDE#TRPBF and TPS54331DR, the LT1507IS8#TRPBF offers unique BOOST-assisted bipolar switching for high efficiency at low input voltages (4V), fixed 3.3V output without external resistors, and robust foldback protection-making it optimal for cost-sensitive, industrial-grade 5V-to-3.3V conversion where input stability is moderate.
Availability
LT1507IS8#TRPBF is available at Aetrix Electronics and suitable for portable computing, battery-powered instrumentation, and distributed power applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1507IS8#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 analog power portfolio with full technical support and long-term product commitments.
The LT1507IS8#TRPBF belongs to Linear's monolithic buck regulator family, engineered for high-efficiency, low-noise DC/DC conversion in space- and cost-constrained industrial and portable systems.
FAQ
What is the maximum output current of the LT1507IS8#TRPBF under continuous operation?
The LT1507IS8#TRPBF delivers up to 1.25A continuously at 3.3V output when properly heatsinked on a 2-layer PCB with 1oz copper and adequate airflow. This limit is constrained by thermal rise-not just the 1.5A switch rating-as shown in the "Maximum Load Current at VOUT = 3.3V" graph (TPC14). Inductor selection (e.g., 5µH Coiltronics CTX5-1) and input voltage (≥4.5V) are critical to sustaining this current without foldback activation.
Does the LT1507IS8#TRPBF require an external feedback resistor network?
No, the LT1507IS8#TRPBF is the fixed 3.3V version and does not require external feedback resistors. Its internal voltage divider connects the SENSE pin directly to the output, maintaining 3.3V ±1.5% regulation across line, load, and temperature. The adjustable variant (e.g., LT1507IS8#TRPBF-ADJ) would require R1/R2, but the -3.3 suffix confirms factory-trimmed fixed output.
How does the BOOST pin function in the LT1507IS8#TRPBF, and what external components are needed?
The BOOST pin on the LT1507IS8#TRPBF supplies elevated gate drive to the internal NPN switch, enabling saturation and 0.3Ω on-resistance. It requires an external flying capacitor (e.g., 3.3nF ceramic) and Schottky diode (e.g., 1N914) from VIN to BOOST. During switch ON, the diode charges the capacitor; during OFF, the capacitor lifts BOOST above VIN-ensuring low VCE(sat) and >85% efficiency at full load.
Can the LT1507IS8#TRPBF be synchronized to an external clock, and what are the valid frequency and logic levels?
Yes, the LT1507IS8#TRPBF accepts external synchronization on the SYNC pin (Pin 5) from 580kHz to 1MHz with logic-level inputs (1.5V–2.2V min high, 0V–0.8V max low, 10%–90% duty cycle). No level-shifting is needed-it directly interfaces with CMOS or TTL clocks. Above 700kHz and >50% duty cycle, external slope compensation may be required per the Applications Information section.
What protection features are built into the LT1507IS8#TRPBF, and how do they activate?
The LT1507IS8#TRPBF integrates cycle-by-cycle current limiting, thermal shutdown, and dual-threshold shutdown (2.38V UVLO, 0.4V deep shutdown). Under short-circuit, SENSE voltage drops below 1.5V, triggering foldback current limiting and frequency reduction (to ~100kHz)-limiting power dissipation in the IC and external diode. Thermal shutdown activates at 125°C junction temperature and auto-recovers upon cooling.
LT1507IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1507IS8#TRPBF FAQ
1.How can I place an order for LT1507IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1507IS8#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 LT1507IS8#TRPBF reliable?
The price and inventory of LT1507IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1507IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1507IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1507IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1507IS8#TRPBF?
LT1507IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1507IS8#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 LT1507IS8#TRPBF?
For technical support, including LT1507IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1507IS8#TRPBF requirements.
6.How does Aetrix verify that LT1507IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1507IS8#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 LT1507IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1507IS8#TRPBF?
All LT1507IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1507IS8#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 LT1507IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1507IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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