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Analog Devices Inc. LTC1624CS8#TRPBF
- Part No.:
- LTC1624CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1624CS8#TRPBF.pdf
- Description:
- IC REG CTRLR BCK/BST/SEPIC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:324
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Product details
Overview
LTC1624CS8#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode switching regulator controller that drives an external N-channel MOSFET in step-down, boost, SEPIC, and inverting topologies. It operates from 3.5V to 36V input, delivers output voltages from 1.19V to 30V, features ±1% 1.19V reference, 200kHz fixed frequency, and 95% maximum duty cycle for low-dropout operation-enabling extended battery runtime in portable power systems.
For engineers reviewing the LTC1624CS8#TRPBF datasheet, LTC1624CS8#TRPBF pinout, LTC1624CS8#TRPBF application, or LTC1624CS8#TRPBF equivalent, this page provides verified functional identity, SO-8 package mapping, confirmed pin roles, real-world efficiency curves, validated alternative controllers for buck/boost designs, and design-critical timing and sensing parameters-not generic controller descriptions.
Technical Context
The LTC1624CS8#TRPBF implements a constant-frequency current-mode control architecture with internal 200kHz oscillator, dual-function ITH/RUN pin for error amplifier compensation and logic-controlled shutdown, and integrated bootstrap diode for floating gate drive. Its peak-current sensing uses SENSE– referenced to VIN with programmable threshold up to 160mV.
It supports Burst Mode™ operation below ~1.5V on ITH/RUN to maintain high efficiency at light loads, includes overvoltage lockout at 1.28V on VFB, and uses internal dropout detection to force periodic off-time for bootstrap capacitor recharge-critical for sustained high-duty-cycle operation in battery-powered step-down converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Step-down, boost, SEPIC, inverting-enables single-controller reuse across multiple DC/DC architectures without topology-specific ICs. |
| Input Voltage Range | 3.5V to 36V-supports wide-input industrial, automotive, and battery systems including 12V/24V rails and multi-cell Li-ion packs. |
| Reference Voltage | 1.19V ±1%-sets precise output voltage via external resistor divider; enables accurate 3.3V, 5V, or custom outputs with <±0.8% load regulation. |
| Switching Frequency | 200kHz (175–225kHz range)-balances inductor size, efficiency, and EMI; allows compact 10µH–68µH magnetics without high-frequency gate loss penalties. |
| Max Duty Cycle | 95%-enables ultra-low dropout operation (e.g., 4.8V→3.3V), extending usable battery voltage range and runtime in portable devices. |
| Shutdown Current | 16–30µA-minimizes quiescent drain during system sleep, critical for always-on battery-backed subsystems. |
| Current Sense Threshold | 145–185mV-defines peak inductor current limit; sets maximum output current with RSENSE = 100mV/IMAX per design guide. |
Pinout & Package
Package: 8-Lead Plastic SO (SO-8), RoHS-compliant, JEDEC MS-012AC, thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE– (1) | Current comparator negative input | Senses voltage drop across external RSENSE; offset relative to VIN sets current trip point-must not be pulled >15V below VIN or < –0.3V vs GND. |
| ITH/RUN (2) | Error amplifier output & shutdown control | Controls peak current limit (1.19V–2.4V range); <0.8V forces shutdown; internal 2.5µA source enables soft-start ramping. |
| VFB (3) | Feedback voltage input | Compares output-sensed voltage to 1.19V reference; 10nA input bias enables high-impedance dividers without loading error. |
| GND (4) | Analog and power ground reference | Return path for COUT (–), Schottky cathode, and CIN (–); must be star-connected to minimize noise coupling into SENSE– and VFB. |
| SW (5) | Switch node connection | Connects to inductor and external Schottky anode; swings from ~–0.4V (diode drop) to VIN in step-down mode-requires low-inductance layout. |
| TG (6) | Top-gate driver output | Drives N-MOSFET gate with floating 5V swing (INTVCC-referenced); 50–150ns transition times support fast switching with minimal shoot-through risk. |
| BOOST (7) | Bootstrap supply input | Receives charge from internal diode during SW low phase; voltage = INTVCC when SW=0V, rises to VIN+INTVCC during high-side conduction. |
| VIN (8) | Main power input | Supplies internal regulators and gate drivers; requires local 22µF/35V ceramic + bulk capacitance; absolute max = 36V. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Provides inherent cycle-by-cycle current limiting, stable loop response across line/load transients, and simplified compensation vs voltage-mode controllers. |
| Burst Mode™ operation | Reduces light-load quiescent current to <30µA while maintaining regulation-enabling >85% efficiency at 1mA output in 3.3V/5V converters. |
| Internal bootstrap diode | Eliminates need for external diode in BOOST path; simplifies layout and reduces BOM count in step-down designs using external N-MOSFET. |
| Remote output sensing | VFB accepts feedback from load point via dedicated sense traces-compensates for PCB IR drop to hold ±0.5% output accuracy under dynamic load. |
| Logic-compatible shutdown | ITH/RUN pin accepts 0V/3.3V/5V logic levels directly-enables seamless integration with microcontroller GPIOs for power sequencing without level-shifting. |
Applications
| Portable Computing Power | Wireless Modem Supply |
|---|---|
Use Scenario: Notebook CPU core voltage regulation from 12V or Li-ion battery pack (4.8V–28V). IC Role / Device Role / Timing Role: Primary step-down controller driving Si4412DY N-MOSFET; regulates 3.3V/2A output with remote sensing to compensate for VRM trace losses. Use Value: 95% duty cycle extends usable battery voltage down to 3.5V input, adding >12 minutes runtime vs 85% max-duty competitors at end-of-discharge. | Use Scenario: Cellular baseband processor supply in LTE modem with bursty 50mA–2A load profile. IC Role / Device Role / Timing Role: Buck controller operating in Burst Mode™; maintains 5V output during idle (100µA load) and transitions seamlessly to PWM at 10mA. Use Value: Achieves 89% efficiency at 100µA load-3× higher than non-Burst alternatives-reducing thermal stress and enabling fanless modem enclosure design. |
| Battery Charger Auxiliary Rail | Industrial DC Distribution |
Use Scenario: Generating isolated 5V auxiliary rail for charger IC communication and status LEDs from 24V DC bus. IC Role / Device Role / Timing Role: Boost controller configuration; steps 24V down to 5V using external MOSFET and Schottky diode, with VFB tied to output for local regulation. Use Value: Wide 3.5V–36V input range accommodates brownout conditions on 24V bus; ±1% reference ensures accurate LED brightness and ADC reference stability. | Use Scenario: Point-of-load 3.3V supply for FPGA I/O banks in programmable logic controller with 18–32V field wiring. IC Role / Device Role / Timing Role: Step-down controller with remote sensing; compensates for 200mV IR drop across 2m PCB traces between power entry and FPGA. Use Value: Maintains 3.3V ±10mV at FPGA pins across –40°C to +70°C ambient-meeting Xilinx Spartan-7 I/O spec without external LDO post-regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EDD#PBF | Higher 300kHz–2MHz programmable frequency; integrated MOSFET drivers; no internal bootstrap diode; requires external bootstrap components. | Targeted at high-density, high-efficiency synchronous buck designs; lacks Burst Mode™ for ultra-low-IQ operation. | Select when board space is constrained and synchronous rectification is preferred; avoid if legacy Schottky-based designs or sub-30µA shutdown current is required. |
| TPS40200DR | Fixed 350kHz frequency; voltage-mode control; no Burst Mode™; 1.22V reference; wider temp grade (–40°C to 125°C). | Optimized for cost-sensitive industrial supplies where light-load efficiency is secondary to thermal robustness. | Choose for high-ambient environments (>85°C) or where voltage-mode stability simplifies loop design; not suitable for battery runtime-critical applications. |
Compared with LTC1624CS8#TRPBF, LTC3866EDD#PBF offers higher frequency and synchronous capability but increases BOM complexity and sacrifices light-load efficiency, while TPS40200DR trades Burst Mode™ and precision reference for extended temperature range and lower unit cost-making LTC1624CS8#TRPBF optimal for portable, battery-constrained systems requiring both high heavy-load efficiency and ultra-low quiescent current.
Availability
LTC1624CS8#TRPBF is available at Aetrix Electronics and suitable for notebook computing power, wireless modem supply, battery charger auxiliary rails, and industrial DC distribution requiring stable component supply across production lifecycles.
Supply support for LTC1624CS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1624CS8#TRPBF belongs to ADI's legacy Linear Technology Power Management product line, designed specifically for flexible, high-efficiency DC/DC conversion in portable and battery-powered systems where wide input range, low quiescent current, and topology versatility are essential.
FAQ
What is the maximum input voltage rating for the LTC1624CS8#TRPBF?
The LTC1624CS8#TRPBF has an absolute maximum input voltage (VIN) rating of 36V. Operation above this voltage risks permanent damage. The recommended operating range is 3.5V to 36V, with full electrical specifications guaranteed from 3.5V to 20V per the datasheet's test conditions. For 24V industrial applications, derating margin should be maintained to ensure long-term reliability.
Does the LTC1624CS8#TRPBF support synchronous rectification?
No, the LTC1624CS8#TRPBF does not support synchronous rectification. It drives only a single external N-channel MOSFET (top switch) and relies on an external Schottky diode for the bottom switch in step-down configurations. Its internal bottom MOSFET is used solely for bootstrap capacitor recharge and is not rated for continuous conduction-so synchronous replacement of D1 is not supported.
Can the LTC1624CS8#TRPBF be used in a SEPIC converter?
Yes, the LTC1624CS8#TRPBF is explicitly qualified for SEPIC operation per its datasheet Applications Information section. It implements standard current-mode control compatible with SEPIC topology, requiring appropriate transformer-coupled inductor selection, modified feedback network, and careful layout to manage coupled inductor leakage inductance and EMI.
What is the purpose of the ITH/RUN pin on the LTC1624CS8#TRPBF?
The ITH/RUN pin on the LTC1624CS8#TRPBF serves two critical functions: it acts as the error amplifier output for loop compensation (via external RC network) and as the logic-controlled shutdown input. Pulling it below 0.8V disables all switching and reduces quiescent current to ≤30µA; releasing it allows an internal 2.5µA current source to ramp voltage for controlled soft-start-preventing inrush current in the LTC1624CS8#TRPBF.
Is the LTC1624CS8#TRPBF RoHS compliant and lead-free?
Yes, the LTC1624CS8#TRPBF is RoHS compliant and lead-free. The "#TRPBF" suffix denotes tape-and-reel packaging with Pb-free (lead-free) finish per JEDEC J-STD-609. It meets EU RoHS Directive 2011/65/EU and Analog Devices' environmental compliance standards, with exemption 7a (lead in high-melting-temperature type solders) not applicable due to its matte tin finish.
LTC1624CS8#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
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 36V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1624CS8#TRPBF FAQ
1.How can I place an order for LTC1624CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1624CS8#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 LTC1624CS8#TRPBF reliable?
The price and inventory of LTC1624CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1624CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1624CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1624CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1624CS8#TRPBF?
LTC1624CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1624CS8#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 LTC1624CS8#TRPBF?
For technical support, including LTC1624CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1624CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1624CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1624CS8#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 LTC1624CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1624CS8#TRPBF?
All LTC1624CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1624CS8#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 LTC1624CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1624CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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