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Analog Devices Inc. LTC1625IS#TRPBF
- Part No.:
- LTC1625IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1625IS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,393
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Product details
Overview
LTC1625IS#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller that drives external dual N-channel MOSFETs without a current-sense resistor, using MOSFET VDS sensing. It operates from 3.7V to 36V input, delivers 1.19V–VIN output, features ±1% 1.19V reference, 150kHz nominal oscillator, and 99% duty-cycle dropout capability - ideal for high-efficiency battery-powered DC/DC conversion in portable computing and wireless infrastructure.
For engineers reviewing the LTC1625IS#TRPBF datasheet, LTC1625IS#TRPBF pinout, LTC1625IS#TRPBF application, or LTC1625IS#TRPBF equivalent, key selection considerations include its no-RSENSE current-mode architecture, programmable fixed-frequency synchronization (100–225kHz), forced continuous mode control via FCB pin, Burst Mode™ operation for light-load efficiency, and industrial-grade temperature range (–40°C to +85°C) in 16-lead SO package.
Technical Context
The LTC1625IS#TRPBF implements constant-frequency current-mode control with MOSFET VDS sensing to eliminate external sense resistors and maximize efficiency. Its error amplifier adjusts ITH voltage (0–2.4V range) to regulate peak inductor current against a precise 1.19V internal reference, while the oscillator supports injection locking over a 1.5:1 frequency range (e.g., 100–225kHz) via SYNC pin.
Fault protection includes foldback current limiting (150mV → 30mV threshold reduction under short-circuit) and output overvoltage lockout at 1.28V. Power management integrates dual gate drivers (TG/BG), bootstrap-based high-side drive (BOOST/SW/TK), and flexible INTVCC sourcing (via internal LDO or external EXTVCC ≥4.7V), enabling robust high-current synchronous buck operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.7V to 36V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Output Voltage Range | 1.19V to VIN - enables adjustable low-voltage rails (e.g., 1.2V, 1.8V, 3.3V, 5V) via VPROG pin selection or external divider. |
| Reference Accuracy | ±1% at 1.19V - ensures tight output regulation across temperature and line/load variations. |
| Oscillator Frequency | 135–165kHz (typ. 150kHz), synchronizable up to 225kHz - allows EMI reduction via frequency dithering or system clock alignment. |
| Shutdown Current | <30µA - extends battery life in standby mode for portable devices. |
| Duty Cycle Limit | 99% - enables ultra-low dropout operation when VIN ≈ VOUT, critical for single-cell Li-ion or backup power applications. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial environments without derating. |
Pinout & Package
Package: 16-lead plastic SO (Small Outline) - surface-mount, industry-standard footprint compatible with automated assembly and thermal relief pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC switch input | Enables high-efficiency external bias supply (≥4.7V); bypasses internal LDO to reduce power loss. |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (100–225kHz) for EMI control or multi-phase coordination; open = 150kHz default. |
| RUN/SS (3) | Run control & soft-start | Pull <1.4V for shutdown; capacitor to ground sets ramp time (~1s/µF) for controlled startup and supply sequencing. |
| 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 point | 0–2.4V control voltage sets peak inductor current threshold; used for loop compensation and current limit setting. |
| SGND (6) | Signal ground reference | Return path for feedback network (VOSENSE) and error amplifier - must be star-connected to COUT negative terminal. |
| VOSENSE (7) | Output voltage feedback input | High-impedance sense node for remote sensing or resistive divider; enables precision regulation independent of PCB trace IR drop. |
| VPROG (8) | Output voltage programming | Selects preset outputs: open = adjustable, 0V = 3.3V, INTVCC = 5V - simplifies design for common rail voltages. |
| VIN (16) | Main supply input | Primary power source (3.7–36V); requires RC filter (4.7Ω/0.1µF) for >3A applications to suppress noise and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Eliminates power loss and board space of external sense resistor by using MOSFET VDS as current transducer. |
| Burst Mode™ operation | Reduces light-load quiescent current to <30µA and maintains >80% efficiency down to 1mA load - critical for always-on battery systems. |
| Dual N-channel MOSFET drive | Integrated TG and BG drivers support logic-level MOSFETs (VGS(th) ≤ 2.5V) with 2A peak current, enabling high-efficiency synchronous rectification. |
| Programmable soft start | External capacitor on RUN/SS pin controls inrush current and prevents output overshoot during power-up or hot-swap events. |
| Output overvoltage protection | Hardware comparator triggers immediate top-FET turn-off if VOSENSE exceeds 1.28V - protects downstream loads from transient damage. |
Applications
| Notebook Power Management | Wireless Modem DC/DC Conversion |
|---|---|
Use Scenario: Regulating 3.3V/5V rails from 5–24V battery or adapter input in ultraportable notebooks and 2-in-1 tablets. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing CPU core, memory, and peripheral supplies with dynamic load response. Use Value: Achieves >92% efficiency at 2A load and maintains stable regulation during rapid CPU burst loads due to fast current-mode control and 150kHz bandwidth. | Use Scenario: Generating clean 3.3V supply for LTE/Wi-Fi baseband processors and RF front-end ICs in cellular modems and IoT gateways. IC Role / Device Role / Timing Role: High-PWM-frequency (225kHz sync) buck controller minimizing conducted EMI near sensitive RF receivers. Use Value: Synchronization capability eliminates beat frequencies with system clocks; Burst Mode™ extends battery runtime during idle/sleep states. |
| Battery Charger Auxiliary Supply | Industrial Distributed Power |
Use Scenario: Providing isolated 5V auxiliary power for charger controller ICs and status LEDs in multi-cell Li-ion battery chargers. IC Role / Device Role / Timing Role: Secondary buck regulator powered from main charger output, operating in forced continuous mode for stable feedback loop. Use Value: FCB pin enables continuous conduction to avoid interaction with primary charger control loop and ensure consistent LED brightness. | Use Scenario: Point-of-load regulation for FPGA I/O banks or sensor signal chains in factory automation controllers with 24V DC bus. IC Role / Device Role / Timing Role: Robust industrial-grade buck controller handling wide input transients (up to 36V) and maintaining regulation across –40°C to +85°C ambient. Use Value: Absolute max ratings and thermal design (θJA = 110°C/W) ensure reliable operation without derating in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850IGN#TRPBF | Higher integration: integrated 5V LDO bias, dual-phase capability, and PMBus interface; 4–36V input, 0.6–5V output. | Targeted at multi-rail, high-density server and telecom power; requires more complex layout and firmware support. | Choose for systems needing digital control, tighter output tolerance (±0.5%), or dual-output coordination - not a drop-in replacement. |
| MP2307DN-LF-Z | Monolithic 3A buck converter (integrated MOSFETs); 4.5–23V input, 0.925–15V output; no VDS sensing or SYNC capability. | Designed for cost-sensitive, low-component-count applications where external MOSFET flexibility is unnecessary. | Choose when board space and BOM count are prioritized over efficiency optimization and programmability. |
Compared with LTC1625IS#TRPBF, LTC3850IGN#TRPBF offers digital configurability and higher integration but demands greater design effort, while MP2307DN-LF-Z trades external MOSFET flexibility and no-RSENSE efficiency for simplicity and lower cost - making LTC1625IS#TRPBF optimal for high-efficiency, thermally demanding, or multi-source MOSFET designs.
Availability
LTC1625IS#TRPBF is available at Aetrix Electronics and suitable for notebook power management, wireless modem DC/DC conversion, battery charger auxiliary supply, industrial distributed power, and portable medical device power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1625IS#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1625 product line was designed specifically for high-efficiency, no-RSENSE synchronous buck controller applications in portable and battery-powered systems - emphasizing light-load efficiency, wide input range, and robust fault protection.
FAQ
What is the maximum input voltage rating for the LTC1625IS#TRPBF?
The LTC1625IS#TRPBF has an absolute maximum input voltage rating of 36V on the VIN and TK pins. Operation above this level risks permanent damage. The recommended operating range is 3.7V to 36V, with minimum input dropping to 3.9V at –40°C for industrial-grade parts like the LTC1625IS#TRPBF. Always observe the 36V limit in transient conditions, including load-dump spikes.
How does the LTC1625IS#TRPBF achieve current sensing without a sense resistor?
The LTC1625IS#TRPBF uses MOSFET VDS sensing: it monitors the voltage drop across the conducting channel of the top or bottom N-channel MOSFET to derive inductor current. This eliminates external sense resistors, reducing power loss and board area. The controller selects the appropriate sense amplifier (TA or BA) based on MOSFET conduction state, and the ITH pin voltage sets the current threshold (max ~150mV).
Can the LTC1625IS#TRPBF operate in forced continuous conduction mode?
Yes, the LTC1625IS#TRPBF supports forced continuous conduction mode via the FCB (Forced Continuous Bias) pin. When FCB is pulled below 1.19V (e.g., grounded), Burst Mode™ operation is disabled and the controller maintains continuous switching regardless of load current - essential for maintaining regulation on secondary windings or avoiding audible noise in sensitive applications.
What package type and lead count does the LTC1625IS#TRPBF use?
The LTC1625IS#TRPBF is supplied in a 16-lead plastic SO (Small Outline) package, with standard JEDEC MS-012AC dimensions (10.3mm × 7.5mm × 1.75mm). This surface-mount package features gull-wing leads, RoHS-compliant matte tin plating, and a thermal resistance θJA of 110°C/W - optimized for industrial temperature operation and reflow soldering compatibility.
Does the LTC1625IS#TRPBF support external clock synchronization?
Yes, the LTC1625IS#TRPBF supports external clock synchronization via the SYNC pin. It can injection-lock to an external clock signal over a 1.5:1 frequency range - e.g., 100–225kHz when the nominal oscillator is 150kHz. The SYNC pin threshold is 1.2V (rising), and the clock high pulse must be between 1µs and 4µs. This feature enables EMI reduction and multi-phase interleaving in complex power systems.
LTC1625IS#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):
- 3.9V ~ 36V
- Frequency - Switching:
- 150kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1625IS#TRPBF FAQ
1.How can I place an order for LTC1625IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1625IS#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 LTC1625IS#TRPBF reliable?
The price and inventory of LTC1625IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1625IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1625IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1625IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1625IS#TRPBF?
LTC1625IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1625IS#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 LTC1625IS#TRPBF?
For technical support, including LTC1625IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1625IS#TRPBF requirements.
6.How does Aetrix verify that LTC1625IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1625IS#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 LTC1625IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1625IS#TRPBF?
All LTC1625IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1625IS#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 LTC1625IS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1625IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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