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Analog Devices Inc. LTC1625CS#TRPBF
- Part No.:
- LTC1625CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1625CS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,996
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Product details
Overview
LTC1625CS#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller that drives external dual N-channel MOSFETs without requiring a current-sense resistor. It operates from 3.7V to 36V input, delivers 1.19V–VIN output with ±1% reference accuracy, supports 150kHz fixed or synchronized frequency, and enables >99% duty-cycle dropout operation - ideal for high-efficiency battery-powered DC/DC conversion in portable computing and wireless infrastructure.
For engineers reviewing the LTC1625CS#TRPBF datasheet, LTC1625CS#TRPBF pinout, LTC1625CS#TRPBF application, or LTC1625CS#TRPBF equivalent, key selection considerations include VDS-based current sensing architecture, forced continuous mode control via FCB pin, programmable soft start using RUN/SS, Burst Mode™ low-load efficiency optimization, and compatibility with logic-level N-MOSFETs rated ≥30V V(BR)DSS.
Technical Context
The LTC1625CS#TRPBF implements current-mode control using MOSFET VDS sensing to eliminate external sense resistors and reduce conduction losses. Its error amplifier adjusts ITH voltage (0–2.4V range) to regulate peak inductor current against a 1.19V internal reference, while the oscillator supports injection locking over a 1.5:1 ratio (100–225kHz) via SYNC pin.
Fault protection includes foldback current limiting (150mV → 30mV threshold reduction during overload), output overvoltage lockout at 1.28V, and dropout counter logic enabling 99% duty cycle by pulsing top gate drive off every 10th cycle to recharge the bootstrap capacitor when VIN approaches VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.7V to 36V - supports wide-input industrial and automotive battery systems without external regulators. |
| Output Voltage Range | 1.19V to VIN - adjustable via external divider or pin-selectable 3.3V/5V modes using VPROG. |
| Reference Accuracy | ±1% at 1.19V - ensures tight output regulation across temperature and line/load variations. |
| Switching Frequency | 150kHz nominal, syncable 100–225kHz - enables EMI control and power stage optimization. |
| Shutdown Current | <30µA - extends battery life in always-on portable devices during standby. |
| Duty Cycle Max | 99% - maintains regulation down to VIN − VOUT = ~100mV, critical for low-dropout battery discharge. |
| Current Sense Method | VDS sensing on top MOSFET - eliminates sense resistor losses and PCB area, improves efficiency >2% at high current. |
Pinout & Package
Package: 16-lead narrow SO (SO-16), RoHS-compliant, moisture-sensitive level 3, rated for 0°C to 70°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC power source selector | Accepts 4.7–7V external supply to bypass internal LDO and improve efficiency; defaults to internal 5.2V regulator if open. |
| SYNC (2) | Oscillator synchronization input | Enables injection locking to external clock (100–225kHz); open or grounded = 150kHz; >1.2V = 225kHz. |
| RUN/SS (3) | Enable + soft-start control | Pull <0.8V for shutdown (IQ <30µA); external capacitor sets ramp time (~1s/µF) for controlled startup. |
| FCB (4) | Forced continuous mode control | Tie to ground to disable Burst Mode™ and enforce continuous conduction - essential for secondary winding regulation. |
| ITH (5) | Error amplifier compensation node | 0–2.4V analog control of peak inductor current; connects to RC network for loop stability. |
| SGND (6) | Signal ground reference | Must connect to COUT (–) terminal only - separates signal return from power ground to avoid noise coupling. |
| VOSENSE (7) | Feedback voltage input | Monitors regulated output via resistive divider; supports remote sensing to reject PCB trace IR drop. |
| VPROG (8) | Output voltage selection | 0V = 3.3V output; INTVCC = 5V output; open = adjustable via VOSENSE divider (1.19V reference). |
| VIN (16) | Main input supply | 3.7–36V input; requires RC filter (4.7Ω + 0.1µF) for >3A applications to suppress high-frequency noise. |
| TK (15) | Top MOSFET Kelvin sense | Must route separately from VIN to top MOSFET drain - enables accurate VDS sensing independent of PCB trace resistance. |
| SW (14) | Switch node | Connects to inductor and bootstrap capacitor (–); swings from diode drop below GND to VIN. |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate with swing = INTVCC minus diode drop, referenced to SW node. |
| BOOST (12) | Bootstrap capacitor (+) terminal | Connects to (+) of CB; swings from diode drop below INTVCC to VIN + INTVCC - supplies floating gate drive. |
| INTVCC (11) | Internal 5.2V regulator output | Supplies gate drivers and internal circuitry; decouple with ≥4.7µF tantalum to PGND. |
| BG (10) | Bottom gate driver output | Drives bottom N-MOSFET gate between PGND and INTVCC - enables synchronous rectification. |
| PGND (9) | Power ground return | Connects to bottom MOSFET source, CIN (–), and CVCC (–); must be low-inductance star point separate from SGND. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates 5–15mΩ sense resistor, saving >0.5W conduction loss at 5A and reducing thermal footprint. |
| Burst Mode™ operation | Reduces light-load quiescent current to <30µA and maintains >85% efficiency at 10mA output - extends runtime in sleep states. |
| Programmable soft start | External capacitor on RUN/SS pin controls inrush current ramp rate, preventing input rail collapse during cold start. |
| Output overvoltage protection | 1.28V comparator triggers immediate top-FET turn-off and bottom-FET turn-on to clamp overshoot - protects downstream ICs. |
| Forced continuous mode control | FCB pin disables Burst Mode™ to sustain minimum switching frequency, enabling stable regulation of auxiliary windings. |
| Wide VIN/VOUT operating range | Supports direct 12V/24V bus conversion to 1.2V–5V rails without pre-regulators - simplifies multi-rail power architecture. |
Applications
| Portable Computing Power | Wireless Baseband Supply |
|---|---|
|
Use Scenario: Step-down conversion from single-cell Li-ion (3.0–4.2V) or 5V USB-PD input to 3.3V core logic rail in ultrabooks and tablets. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing up to 4.5A load with adaptive Burst Mode™ for dynamic CPU power states. Use Value: Achieves >94% efficiency at 2A and >88% at 50mA, extending battery life while maintaining <15mV output ripple via VDS sensing precision. |
Use Scenario: Generating stable 5V supply for LTE/5G RF transceivers and baseband processors in small-cell radios. IC Role / Device Role / Timing Role: High-current buck controller synchronized to system clock via SYNC pin to minimize conducted EMI in sensitive RF bands. Use Value: Injection-lock capability reduces spectral spreading; 99% dropout enables full regulation until battery reaches 5.05V, maximizing usable capacity. |
| Battery Charger Auxiliary Rail | Distributed Industrial Power |
|
Use Scenario: Providing isolated 3.3V bias supply for charger IC communication interfaces (I²C, SMBus) during CC/CV charging phases. IC Role / Device Role / Timing Role: Secondary buck controller powered from main charger output, enabled via RUN/SS pin tied to charger status signal. Use Value: Micropower shutdown (<30µA) prevents parasitic drain when charger is inactive; FCB pin ensures continuous mode for clean digital signaling. |
Use Scenario: Local 12V-to-3.3V conversion for PLC I/O modules powered from 24V industrial bus with wide input transients. IC Role / Device Role / Timing Role: Robust buck controller tolerating 36V surges and −40°C to 70°C ambient, driving Si4410DY MOSFETs per reference design. Use Value: Absolute max rating of 36V input and integrated overvoltage/foldback protection eliminate need for external TVS or current-limiting circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Fixed 2MHz frequency, no SYNC or FCB pins, requires external sense resistor, lower VIN max (36V same but 3.3V min). | Lacks Burst Mode™ and forced continuous control - unsuitable for secondary winding regulation or ultra-low-IQ battery apps. | Select only if high-frequency operation (>1MHz) and minimal BOM count outweigh need for adaptive light-load efficiency. |
| TPS54202DRCT | Integrated high-side MOSFET, 4.5–28V input, no VDS sensing, uses external sense resistor, no programmable soft start. | Lower current capability (2A vs 5A+ with discrete FETs), no TK pin for Kelvin sensing - limits accuracy in high-current designs. | Choose when board space is constrained and 2A output suffices; avoid where >3A, precision current limit, or MOSFET flexibility are required. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the LTC1625CS#TRPBF uniquely combines resistorless VDS current sensing, Burst Mode™, FCB-controlled continuous operation, and 36V input tolerance - making it the only option supporting both high-efficiency battery discharge and auxiliary winding regulation in a single controller.
Availability
LTC1625CS#TRPBF is available at Aetrix Electronics and suitable for portable computing power, wireless infrastructure supplies, battery charger auxiliary rails, and distributed industrial power requiring stable component supply with full production lifecycle support.
Supply support for LTC1625CS#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 of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LTC1625CS#TRPBF belongs to Linear's synchronous buck controller family designed specifically for high-efficiency, high-current DC/DC conversion in space-constrained portable and industrial systems where resistorless current sensing and adaptive light-load operation are critical.
FAQ
What is the maximum input voltage rating for the LTC1625CS#TRPBF?
The LTC1625CS#TRPBF has an absolute maximum input voltage rating of 36V on VIN and TK pins. Operation above 36V risks permanent damage. The recommended operating range is 3.7V to 36V, with guaranteed functionality down to 3.7V at 0°C to 70°C ambient per the C-grade specification. Always observe derating guidelines for reliability at temperature extremes.
Does the LTC1625CS#TRPBF require an external current-sense resistor?
No, the LTC1625CS#TRPBF does not require an external current-sense resistor. It implements MOSFET VDS sensing using the top MOSFET's on-resistance (RDS(ON)) as the current-sense element. This architecture eliminates sense resistor losses and PCB area, directly contributing to the >94% peak efficiency documented in typical applications.
How does the FCB pin affect Burst Mode™ operation in the LTC1625CS#TRPBF?
The FCB pin on the LTC1625CS#TRPBF disables Burst Mode™ when pulled below 1.19V (typically grounded), forcing continuous conduction mode regardless of load. This is essential for maintaining regulation on auxiliary windings or ensuring minimum switching frequency in noise-sensitive applications. Leaving FCB open or tying it to INTVCC enables default Burst Mode™ operation.
What package type and temperature grade does the LTC1625CS#TRPBF use?
The LTC1625CS#TRPBF uses a 16-lead narrow SO (SO-16) package and is specified for 0°C to 70°C ambient operation (Commercial grade). The "CS" suffix explicitly denotes this SO package and commercial temperature range, distinguishing it from the SSOP-packaged "CGN" and industrial-grade "IS" variants.
Can the LTC1625CS#TRPBF synchronize its switching frequency to an external clock?
Yes, the LTC1625CS#TRPBF supports external synchronization via the SYNC pin. It can injection-lock to an external clock signal within a 1.5:1 range of its nominal 150kHz frequency - i.e., 100kHz to 225kHz. The clock high level must exceed 1.2V for 1–4µs, and the top MOSFET turn-on aligns with the rising edge of the synchronized clock.
LTC1625CS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.7V ~ 36V
- Frequency - Switching:
- 150kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1625CS#TRPBF FAQ
1.How can I place an order for LTC1625CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1625CS#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 LTC1625CS#TRPBF reliable?
The price and inventory of LTC1625CS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1625CS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1625CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1625CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1625CS#TRPBF?
LTC1625CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1625CS#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 LTC1625CS#TRPBF?
For technical support, including LTC1625CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1625CS#TRPBF requirements.
6.How does Aetrix verify that LTC1625CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1625CS#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 LTC1625CS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1625CS#TRPBF?
All LTC1625CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1625CS#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 LTC1625CS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1625CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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