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Analog Devices Inc. LTC1625CS#PBF
- Part No.:
- LTC1625CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1625CS#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:567
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Product details
Overview
LTC1625CS#PBF 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, features ±1% 1.19V reference, 150kHz nominal oscillator, and Burst Mode™ operation for high efficiency at light loads - used in notebook power supplies and battery-powered DC/DC conversion.
For engineers reviewing the LTC1625CS#PBF datasheet, LTC1625CS#PBF pinout, LTC1625CS#PBF application, or LTC1625CS#PBF equivalent, key selection criteria include MOSFET VDS-based current sensing, forced continuous mode control via FCB pin, programmable output voltage selection (3.3V/5V/adjustable), dropout operation up to 99% duty cycle, and synchronization capability over 1.5:1 frequency range.
Technical Context
The LTC1625CS#PBF implements current-mode control using MOSFET VDS sensing to eliminate RSENSE, with ITH pin voltage (0–2.4V) setting peak inductor current threshold. Its internal 5.2V LDO powers gate drivers, while EXTVCC switchover enables high-efficiency self-biasing from output rails.
Synchronization is achieved via the SYNC pin, supporting injection lock from 100% to 150% of nominal 150kHz (i.e., 150–225kHz); RUN/SS provides soft-start timing via external capacitor; FCB pin disables Burst Mode to enforce continuous conduction for secondary winding regulation.
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 - enables adjustable low-voltage rails (e.g., 1.2V, 1.8V, 3.3V, 5V) or direct pass-through configurations. |
| Reference Accuracy | ±1% at 1.19V - ensures tight output regulation across temperature and line/load variations. |
| Oscillator Frequency | 135–165kHz (typ. 150kHz) - balances efficiency (lower fSW) and component size (higher fSW) in buck designs. |
| Shutdown Quiescent Current | <30µA - extends battery life in portable systems during standby or deep sleep modes. |
| Current Sense Threshold | 120–170mV (ΔVSENSE(MAX)) - sets peak inductor current limit based on top MOSFET RDS(ON), enabling no-RSENSE design. |
| Duty Cycle Limit | Up to 99% - supports ultra-low dropout operation when VIN approaches VOUT, critical for battery end-of-discharge. |
Pinout & Package
Package: 16-lead narrow SO (SO-16), RoHS-compliant, surface-mount, JEDEC MS-012AC standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC supply switch input | Enables external biasing of INTVCC above 4.7V; bypasses internal LDO to improve efficiency. |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (150–225kHz); forces lock within 1.5:1 ratio; open or grounded = 150kHz free-run. |
| RUN/SS (3) | Enable + soft-start control | Pull below 0.8V to shut down; external capacitor sets ramp time (~1s/µF) for controlled startup. |
| FCB (4) | Forced continuous mode control | Tie to GND to disable Burst Mode; enables stable light-load regulation and secondary winding control. |
| ITH (5) | Error amplifier compensation node | Voltage (0–2.4V) sets current comparator threshold; used for loop compensation and current limiting. |
| SGND (6) | Signal ground reference | Return path for feedback network (VOSENSE) and error amplifier; must be star-connected to COUT negative. |
| VOSENSE (7) | Output voltage feedback input | Monitors regulated output directly or via resistive divider; determines regulation setpoint with VPROG. |
| VPROG (8) | Output voltage programming select | 0V = 3.3V output; INTVCC = 5V output; open = adjustable via VOSENSE divider (1.19V reference). |
| VIN (16) | Main input supply | Primary power source (3.7–36V); requires RC filter (4.7Ω + 0.1µF) for >3A applications to reduce noise. |
| TK (15) | Top MOSFET Kelvin sense | Must route separately from VIN to top MOSFET drain to enable accurate VDS sensing and eliminate PCB trace resistance error. |
| SW (14) | Switch node | Connects to inductor and bootstrap capacitor negative terminal; swings from ~−0.7V to VIN. |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate with swing referenced to SW node; requires bootstrap capacitor (CB) for high-side drive. |
| BOOST (12) | Bootstrap capacitor positive terminal | Connects to (+) of CB; swings from INTVCC − 0.7V to VIN + INTVCC - enables floating high-side 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; synchronous rectification reduces conduction loss. |
| PGND (9) | Power ground return | Source connection for bottom MOSFET, CVCC, and CIN negative terminals; separate from SGND to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| No sense resistor required | Uses MOSFET VDS sensing (TK + SW inputs) to eliminate power loss and board area of discrete RSENSE. |
| Programmable output voltage | VPROG pin selects fixed 3.3V, 5V, or adjustable mode - simplifies BOM and enables multi-rail designs with single controller. |
| Burst Mode™ operation | Reduces switching losses at light loads by gating entire switching cycles - improves light-load efficiency by >10% vs. forced continuous mode. |
| 99% maximum duty cycle | Enables operation with VIN as low as VOUT + dropout (e.g., 3.6V input for 3.3V output), extending usable battery range. |
| Output overvoltage protection | OV comparator triggers at 1.24–1.32V (VOVL) - clamps top MOSFET off and turns on bottom MOSFET to safely discharge overshoot. |
| Forced continuous mode control | FCB pin allows disabling Burst Mode under light load - essential for maintaining regulation on auxiliary windings in multi-output flyback-derived topologies. |
Applications
| Notebook CPU Core Power Supply | Portable Medical Device Battery Regulator |
|---|---|
Use Scenario: Provides tightly regulated 1.2V/1.8V core voltage for Intel/AMD mobile processors in ultrabooks with dynamic load steps up to 10A. IC Role / Device Role / Timing Role: Synchronous buck controller managing dual N-MOSFET power stage with VDS current sensing and fast transient response. Use Value: Eliminates sense resistor loss (≥0.5W saved at 5A), achieves >92% efficiency at 2A, and maintains ±1% output accuracy across –20°C to 70°C ambient. |
Use Scenario: Powers microcontroller, sensor front-end, and Bluetooth radio in handheld ECG monitor running from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Step-down controller delivering 3.3V at up to 2A with Burst Mode™ to extend runtime during 95% idle time. Use Value: Achieves 28µA total system quiescent current in shutdown, supports 99% duty cycle for full battery utilization down to 3.1V, and includes OV protection for safety-critical compliance. |
| Industrial PLC I/O Module Power | Automotive Infotainment USB Hub Regulator |
Use Scenario: Generates isolated 5V rail for digital I/O conditioning circuits in DIN-rail mounted programmable logic controllers with 24V nominal input. IC Role / Device Role / Timing Role: High-input-voltage buck controller driving Si4410DY MOSFETs, synchronized to system clock to reduce EMI in dense PCB layouts. Use Value: Operates reliably from 3.7V to 36V input, withstands 40V transients per ISO 7637-2, and provides foldback current limiting during field-wiring faults. |
Use Scenario: Supplies clean 5V power to USB 2.0 peripherals (keyboard, flash drive) in vehicle infotainment head units powered from 12V battery (9–16V range). IC Role / Device Role / Timing Role: Automotive-grade synchronous buck controller with EXTVCC self-biasing from 5V output to minimize heat generation. Use Value: Delivers 3A continuous with <15mV p-p ripple, meets CISPR-25 Class 5 conducted EMI limits via SYNC pin synchronization, and supports cold-crank operation down to 6V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | Integrated power stage (2A), 3.4–42V input, 200kHz–3MHz sync range, higher IQ (2.5µA shutdown) | Lower solution size but fixed 2A limit; lacks VPROG-selectable outputs and TK Kelvin sense | Choose LT8610EMSE#PBF for compact, integrated 2A solutions where external MOSFET flexibility is unnecessary. |
| TPS54202DRCT | Integrated FETs (2A), 4.5–28V input, 500kHz–2.2MHz sync, no VDS sensing - uses current-sense resistor | Higher efficiency at mid-load but adds RSENSE loss and layout complexity; no 99% duty cycle | Choose TPS54202DRCT for cost-sensitive 2A applications where RSENSE is acceptable and input voltage stays above 4.5V. |
Compared with LT8610EMSE#PBF and TPS54202DRCT, the LTC1625CS#PBF uniquely supports external high-current N-MOSFETs, no-RSENSE operation, and ultra-low dropout - making it optimal for >3A, wide-input, or battery-end-of-life designs where integration is secondary to performance and flexibility.
Availability
LTC1625CS#PBF is available at Aetrix Electronics and suitable for notebook power supplies, portable medical devices, industrial PLC modules, and automotive infotainment systems requiring stable component supply with long-term manufacturability.
Supply support for LTC1625CS#PBF 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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, communications, and industrial markets.
The LTC1625CS#PBF belongs to Linear's legacy high-efficiency DC/DC controller family, designed specifically for synchronous step-down conversion in space-constrained, battery-sensitive, and wide-input applications where RSENSE-free current sensing and ultra-low dropout are critical.
FAQ
What is the maximum input voltage rating for the LTC1625CS#PBF?
The LTC1625CS#PBF has an absolute maximum input voltage rating of 36V on the VIN and TK pins. Operation beyond this voltage risks permanent damage. The recommended operating range remains 3.7V to 36V, with minimum input dropping to 3.9V for industrial-grade variants at –40°C ambient.
Does the LTC1625CS#PBF require an external current-sense resistor?
No, the LTC1625CS#PBF does not require an external current-sense resistor. It implements MOSFET VDS sensing using the TK (Kelvin sense) and SW pins to measure top MOSFET conduction voltage drop - eliminating sense resistor power loss and board area while maintaining accurate current limiting.
How is output voltage selected on the LTC1625CS#PBF?
Output voltage on the LTC1625CS#PBF is selected via the VPROG pin: grounding VPROG sets 3.3V output, connecting VPROG to INTVCC selects 5V output, and leaving VPROG open enables adjustable mode using a resistive divider from VOSENSE to GND with the internal 1.19V reference.
What package type is used for the LTC1625CS#PBF?
The LTC1625CS#PBF uses a 16-lead narrow SO (SO-16) plastic surface-mount package per JEDEC MS-012AC, with 0.150" body width and 0.050" lead pitch. It is RoHS-compliant and rated for 0°C to 70°C operating ambient temperature.
Can the LTC1625CS#PBF synchronize to an external clock?
Yes, the LTC1625CS#PBF can synchronize its internal oscillator to an external clock applied to the SYNC pin. It supports injection locking over a 1.5:1 frequency range - e.g., 150kHz nominal oscillator locks to 100–225kHz clocks - with rising-edge alignment and 1.2V threshold detection.
LTC1625CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1625CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1625CS#PBF 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#PBF reliable?
The price and inventory of LTC1625CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1625CS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1625CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1625CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1625CS#PBF?
LTC1625CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1625CS#PBF 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#PBF?
For technical support, including LTC1625CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1625CS#PBF requirements.
6.How does Aetrix verify that LTC1625CS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1625CS#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1625CS#PBF?
All LTC1625CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1625CS#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1625CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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