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Analog Devices Inc. LTC1504IS8#TRPBF
- Part No.:
- LTC1504IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1504IS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,863
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Product details
Overview
LTC1504IS8#TRPBF from Analog Devices (formerly Linear Technology) is a self-contained, synchronous step-down DC/DC regulator IC delivering up to 500mA at 3.3V output with 92% peak efficiency, internal 1.5Ω power switches, and operation across 4V–10V input range. It serves as a compact, high-efficiency voltage source in space-constrained portable digital systems requiring stable low-voltage rails.
For engineers reviewing the LTC1504IS8#TRPBF datasheet, LTC1504IS8#TRPBF pinout, LTC1504IS8#TRPBF application, or LTC1504IS8#TRPBF equivalent, key selection considerations include its SO-8 package thermal performance, adjustable current limit via IMAX pin, soft-start control via external capacitor, ±1A peak switch current capability, and 200kHz fixed oscillator frequency synchronizable up to 500kHz.
Technical Context
The LTC1504IS8#TRPBF implements a synchronous buck topology using integrated P-channel high-side and N-channel low-side MOSFETs, enabling bidirectional output current sourcing/sinking for tight regulation under dynamic loads. Its feedback loop combines a precision 1.265V reference (±1% trimmed), transconductance error amplifier (gmV = 350–1100 µmho), and dual transient comparators (MIN/MAX) that enforce ±3% output window compliance independent of main loop response.
Current limiting is implemented via an ILIM amplifier comparing SW-to-GND voltage drop during Q1 conduction against a user-set threshold at IMAX, with reaction dynamics governed by the SS pin's external capacitor. The internal 200kHz sawtooth oscillator drives nonoverlapping gate logic, and COMP pin allows full external compensation of both voltage and current-limit loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500mA continuous at 3.3V - supports moderate-power microcontrollers and I/O rails without external switches |
| Efficiency | 92% peak - minimizes thermal load in sealed enclosures and extends battery runtime |
| Input Voltage Range | 4V to 10V - compatible with single-cell Li-ion (fully charged) and multi-cell alkaline/NiMH supplies |
| Switching Frequency | 200kHz typical, synchronizable to 500kHz - balances EMI, inductor size, and transient response |
| Feedback Reference | 1.265V ±1% - enables precise output setting with minimal resistor tolerance impact |
| Peak Switch Current | ±1A - accommodates short-term load surges and inductor saturation margins |
| Quiescent Current | 0.3–0.6mA (active), <1µA (shutdown) - preserves battery life in always-on standby modes |
| Thermal Resistance | θJA = 90°C/W - requires PCB copper pour on GND pin for sustained 500mA operation |
Pinout & Package
Package: 8-lead plastic SO-8 (S8), exposed GND pad recommended for thermal dissipation. Pin 4 (GND) acts as primary heat sink; layout must maximize copper area connected to this pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IMAX (Pin 1) | Current Limit Threshold Input | Internal 12µA sink sets overcurrent trip point via resistor to VCC; floating disables limit |
| VCC (Pin 2) | Power Supply Input | 4V–10V input; requires local low-ESR ceramic bypass capacitor adjacent to pin |
| SW (Pin 3) | Switch Node Output | Drives external inductor; connects to Q1 drain/Q2 source; avoid routing near sensitive analog traces |
| GND (Pin 4) | Power and Signal Ground | Primary thermal path; all bypass caps and feedback resistors must tie here with shortest possible traces |
| SENSE (Pin 5) | Fixed-Output Voltage Sense | Direct connection to 3.3V output node; internal 3.3V reference servo; no external divider needed |
| SHDN (Pin 6) | Active-Low Shutdown Control | Pull ≤0.8V to disable regulator; SW pulled low in shutdown to prevent backfeeding |
| SS (Pin 7) | Soft-Start and Current-Limit Control | External capacitor (e.g., 0.1µF) sets ramp rate; also serves as integrator for ILIM loop |
| COMP (Pin 8) | Error Amplifier Output | High-impedance node for external RC compensation network; critical for loop stability |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated 1.5Ω P- and N-channel MOSFETs eliminate external power devices and reduce BOM count |
| Dual Transient Comparators (MIN/MAX) | Enforce ±3% output window independently of main loop, improving load-step response by >3× vs standard error amp alone |
| Adjustable Current Limit | Single resistor from VCC to IMAX sets trip threshold from ~100mA to >600mA - no sense resistor required |
| Soft-Start + Current-Limit Integration | Shared SS pin enables coordinated startup and overload recovery; 0.1µF ceramic provides optimal timing and loop compensation |
| Shutdown with Active Pull-Down | SW pin driven low during SHDN asserts prevents reverse current flow and ensures clean rail collapse |
| Thermally Optimized SO-8 | GND pin (Pin 4) functions as integral heatsink; 90°C/W θJA achievable with ≥1 cm² copper pour |
Applications
| Portable Digital Systems | Active Termination |
|---|---|
Use Scenario: Powering 3.3V I/O banks in handheld test equipment with Li-ion battery input (4.2V–3.0V). IC Role / Device Role / Timing Role: Primary 3.3V supply regulator providing regulated rail with fast transient response to burst-mode data transfers. Use Value: 500mA output and 92% efficiency extend battery life while maintaining <1% output deviation during 200mA load steps. | Use Scenario: Providing termination voltage for SCSI or parallel bus lines in embedded controllers. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 3.3V source ensuring signal integrity and impedance matching. Use Value: Internal 1% reference and ±3% transient window guarantee stable termination voltage across temperature and line variations. |
| Auxiliary Output Supplies | Minimum Part Count Switchers |
Use Scenario: Generating isolated 3.3V auxiliary rail from main 5V system supply in industrial PLC modules. IC Role / Device Role / Timing Role: Secondary regulator delivering clean, well-regulated power to isolated communication interfaces (e.g., RS-485 transceivers). Use Value: SO-8 footprint and four-component design (CIN, COUT, L, CSS) minimize board area and assembly cost. | Use Scenario: Replacing linear regulators in legacy designs where space and thermal constraints prohibit redesign. IC Role / Device Role / Timing Role: Drop-in synchronous buck replacement offering >3× efficiency improvement over 78L33. Use Value: Pin-compatible upgrade path (SO-8) with identical footprint and minimal external component changes required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz switching frequency, 300mA output, smaller 6-pin WSON package, no IMAX current limit adjustment | Better suited for ultra-compact, high-frequency designs with lower current needs; lacks adjustable overcurrent protection | Select when board space is critical and 300mA suffices; avoid if adjustable current limit or 500mA output is required |
| MP2307DN-LF-Z | 40V max input, 2A output, external MOSFET drivers, requires external bootstrap capacitor and compensation | Targeted at higher-power, wider-input applications; significantly more complex external circuitry needed | Select only for >1A loads or >10V inputs; not a functional substitute due to architecture and pinout differences |
Compared with TPS62231DRVR and MP2307DN-LF-Z, the LTC1504IS8#TRPBF uniquely balances 500mA output, integrated switches, adjustable current limit, and SO-8 manufacturability - making it optimal for mid-power portable systems where simplicity, thermal manageability, and protection flexibility are prioritized over ultra-high frequency or extreme input voltage range.
Availability
LTC1504IS8#TRPBF is available at Aetrix Electronics and suitable for portable digital systems, active termination circuits, auxiliary voltage supplies, and minimum-part-count switcher designs requiring stable component supply and long-term industrial availability.
Supply support for LTC1504IS8#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 technical and manufacturing continuity for legacy Linear products including the LTC portfolio.
The LTC1504IS8#TRPBF belongs to Linear's precision monolithic DC/DC regulator family, designed specifically for space- and efficiency-constrained applications where integration, thermal performance, and robust protection features outweigh the need for ultra-high switching frequencies.
FAQ
What is the maximum continuous output current of the LTC1504IS8#TRPBF?
The LTC1504IS8#TRPBF delivers up to 500mA continuous output current at 3.3V with proper PCB thermal design - specifically, a minimum 1 cm² copper pour connected to Pin 4 (GND). This rating assumes 5V input, 25°C ambient, and adequate input/output capacitance per the datasheet recommendations. Peak switch current capability is ±1A, supporting short-duration transients beyond the continuous rating.
Does the LTC1504IS8#TRPBF require external MOSFETs?
No, the LTC1504IS8#TRPBF integrates both high-side (P-channel) and low-side (N-channel) power MOSFETs with 1.5Ω typical on-resistance. This eliminates the need for external switches, reducing BOM count and layout complexity. The device operates as a complete synchronous buck regulator with only an inductor, input/output capacitors, soft-start capacitor, and optional current-limit resistor required for full functionality.
How is output voltage set on the LTC1504IS8#TRPBF?
The LTC1504IS8#TRPBF is the fixed 3.3V output variant. Its SENSE pin (Pin 5) connects directly to the output node and is internally referenced to 3.3V ±3.4%, eliminating the need for external feedback resistors. This differs from the adjustable LTC1504CS8 variant, which uses the FB pin with an external resistor divider to set output voltage. No configuration or trimming is required for nominal 3.3V operation.
Can the LTC1504IS8#TRPBF be synchronized to an external clock?
Yes, the LTC1504IS8#TRPBF supports external synchronization up to 500kHz. Its internal 200kHz oscillator can be overridden by applying a clean square wave to the SHDN pin (with appropriate AC coupling and biasing), allowing phase alignment with system clocks or noise-sensitive frequency bands. This feature helps reduce beat frequencies and simplifies EMI filtering in multi-rail power systems.
What thermal considerations apply to the LTC1504IS8#TRPBF in SO-8 package?
The LTC1504IS8#TRPBF has a junction-to-ambient thermal resistance (θJA) of 90°C/W in standard SO-8 layout. To sustain 500mA output, Pin 4 (GND) must be connected to a large copper area acting as a heatsink - minimum 1 cm² recommended. Thermal vias under the GND pad further improve dissipation. Without adequate copper, junction temperature may exceed 115°C (TJMAX) under full load, triggering thermal shutdown or degrading reliability.
LTC1504IS8#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):
- 10V
- Voltage - Output (Min/Fixed):
- 1.265V
- Voltage - Output (Max):
- 9V
- Current - Output:
- 500mA
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1504IS8#TRPBF FAQ
1.How can I place an order for LTC1504IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1504IS8#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 LTC1504IS8#TRPBF reliable?
The price and inventory of LTC1504IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1504IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1504IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1504IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1504IS8#TRPBF?
LTC1504IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1504IS8#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 LTC1504IS8#TRPBF?
For technical support, including LTC1504IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1504IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1504IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1504IS8#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 LTC1504IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1504IS8#TRPBF?
All LTC1504IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1504IS8#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 LTC1504IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1504IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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