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Analog Devices Inc. LTC1625IGN#PBF
- Part No.:
- LTC1625IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1625IGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,513
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Product details
Overview
LTC1625IGN#PBF 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, and features ±1% 1.19V reference, 150kHz nominal oscillator, and forced continuous mode control - used in high-efficiency battery-powered DC/DC conversion for portable computing and wireless infrastructure.
For engineers reviewing the LTC1625IGN#PBF datasheet, LTC1625IGN#PBF pinout, LTC1625IGN#PBF application, or LTC1625IGN#PBF equivalent, key selection criteria include its no-RSENSE current-mode architecture, 16-lead SSOP package, Burst Mode™ operation for light-load efficiency, programmable soft start via RUN/SS, and compatibility with logic-level N-MOSFETs for high-current synchronous buck designs.
Technical Context
The LTC1625IGN#PBF implements constant-frequency current-mode control using internal VDS sensing across external top/bottom N-MOSFETs, eliminating sense resistors and improving efficiency. Its error amplifier adjusts ITH voltage (0–2.4V range) to regulate peak inductor current against a 1.19V reference, with load regulation of ±0.2% and line regulation of 0.01%/V.
It supports injection-lock synchronization over a 1.5:1 frequency range (e.g., 100–150kHz or 150–225kHz), provides foldback current limiting (150mV → 30mV threshold), and includes output overvoltage protection (1.28V trip). The INTVCC regulator delivers 5.2V ±2% at up to 50mA, powered either from VIN or an external EXTVCC source above 4.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.7V to 36V - supports wide-input industrial and automotive battery systems, including 12V/24V rails and multi-cell Li-ion packs. |
| Output Voltage Range | 1.19V to VIN - enables adjustable low-voltage rails (e.g., 1.2V, 1.8V, 3.3V, 5V) via external divider or pin-selectable fixed outputs. |
| Reference Accuracy | ±1% at 1.19V - ensures tight output regulation under varying load, temperature, and line conditions. |
| Oscillator Frequency | 135–165kHz (typ. 150kHz) - balances MOSFET switching loss vs. inductor size; synchronizable to external clock up to 225kHz. |
| Shutdown Current | <30µA - enables ultra-low-power standby in battery-critical applications like PDAs and cellular modems. |
| Current Sense Threshold | 120–170mV - sets peak inductor current limit without external resistor; scales with RDS(ON) of top MOSFET. |
| Max Duty Cycle | 99% - supports very low dropout operation (e.g., 5.1VIN → 5VOUT) by extending top-FET on-time near VIN ≈ VOUT. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), 0.15mm lead pitch, JEDEC MO-153 compliant, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC power switch input | Enables high-efficiency external biasing (e.g., from VOUT); switches INTVCC supply when >4.7V; max 7V rating. |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (100–225kHz); locks internal 150kHz oscillator; threshold = 1.2V rising edge. |
| RUN/SS (3) | Enable & soft-start control | Pull <1.4V to shut down; internal 3µA current charges CSS capacitor for controlled ramp-up of ITH. |
| FCB (4) | Forced continuous mode select | Tie to GND to disable Burst Mode; tie to INTVCC to enable Burst Mode; threshold = 1.19V. |
| ITH (5) | Error amplifier compensation node | 0–2.4V control voltage sets current comparator threshold; directly determines peak inductor current. |
| SGND (6) | Signal ground reference | Return for VOSENSE feedback path; must be connected to COUT negative terminal to minimize noise coupling. |
| VOSENSE (7) | Output voltage feedback input | High-impedance (10nA typical) sense node; accepts remote sensing or resistive divider for precision regulation. |
| VPROG (8) | Output voltage programming | Selects fixed 3.3V (VPROG < 0.8V) or 5V (VPROG > 3.5V); open for adjustable output via VOSENSE divider. |
| PGND (9) | Power ground return | Low-impedance return for bottom MOSFET source, CVCC, and CIN; separates power and signal grounds. |
| BG (10) | Bottom gate driver output | Drives bottom N-MOSFET gate between PGND and INTVCC (5.2V); 2A peak drive capability. |
| INTVCC (11) | Internal 5.2V regulator output | Supplies gate drivers and internal circuitry; requires ≥4.7µF tantalum decoupling to PGND. |
| BOOST (12) | Bootstrap capacitor positive terminal | Swings from ~4.5V below INTVCC to VIN + INTVCC; powers floating top-gate driver. |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate with swing equal to INTVCC minus diode drop, referenced to SW node. |
| SW (14) | Switch node connection | Connects to inductor, top MOSFET source, and bootstrap capacitor negative terminal; swings from –0.7V to VIN. |
| TK (15) | Top MOSFET Kelvin sense | Must be routed separately from VIN to top MOSFET drain to enable accurate VDS sensing. |
| VIN (16) | Main input supply | 3.7–36V input; requires RC filter (4.7Ω + 0.1µF) for >3A applications to suppress high-frequency noise. |
Key Features
| Feature | Design Value |
|---|---|
| No current-sense resistor required | Uses MOSFET VDS sensing (TK/VIN/SW pins) to eliminate 5–10% power loss and PCB area associated with discrete sense resistors. |
| Dual N-channel MOSFET synchronous drive | Integrated TG/BG drivers support logic-level N-MOSFETs (e.g., Si4410DY), enabling >90% efficiency at 4.5A loads. |
| Programmable fixed-frequency with injection lock | 150kHz base frequency lockable to external clock (±50% range), enabling EMI reduction and multi-rail synchronization. |
| Forced continuous mode control pin (FCB) | Disables Burst Mode™ to maintain regulation on secondary windings or during light-load transient response requirements. |
| Logic-controlled micropower shutdown | IQ < 30µA shutdown state enables long battery life in portable devices; RUN/SS pin provides clean enable/disable sequencing. |
| Output overvoltage protection | 1.28V comparator triggers immediate top-FET turn-off and bottom-FET turn-on to clamp overshoot during load dump or startup faults. |
Applications
| Notebook and Palmtop Computers | Cellular Telephones |
|---|---|
Use Scenario: Power management in space-constrained ultraportable notebooks requiring efficient 3.3V/5V rails from single-cell or multi-cell Li-ion batteries. IC Role / Device Role / Timing Role: Synchronous step-down controller managing high-current CPU/I/O core supplies with minimal thermal footprint. Use Value: 99% duty cycle operation extends runtime near battery end-of-discharge; Burst Mode™ reduces quiescent current to <30µA in sleep states. | Use Scenario: Main system power supply in 3G/4G handsets where efficiency, size, and thermal performance are critical under bursty RF transmit loads. IC Role / Device Role / Timing Role: Primary buck controller delivering stable 1.2V core and 3.3V interface voltages from 3.4–4.2V battery input. Use Value: No-RSENSE architecture avoids 50–100mΩ sense resistor losses; 16-pin SSOP fits tight board layouts without compromising thermal dissipation. |
| Battery Chargers | Distributed Power Systems |
Use Scenario: Constant-current/constant-voltage (CC/CV) charging stage for Li-ion packs, where precise VOUT regulation and fast transient response prevent overcharge. IC Role / Device Role / Timing Role: Adjustable-output buck controller regulating charger IC input voltage or directly driving charge FETs in linear+switching hybrid topologies. Use Value: ±1% 1.19V reference and 0.01%/V line regulation ensure <10mV output drift across full input range; foldback current limit protects during shorted-cell faults. | Use Scenario: Intermediate bus converter in telecom or industrial backplanes converting 48V or 24V to 5V/3.3V for point-of-load regulation. IC Role / Device Role / Timing Role: High-input-voltage synchronous buck controller supporting wide VIN (3.7–36V) and robust fault protection in harsh environments. Use Value: 36V absolute max VIN rating and integrated OVP/foldback protect against surges and hot-swap transients; EXTVCC option allows self-biasing from intermediate rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EGN#PBF | Higher 250kHz–750kHz frequency range; supports 4.5–38V input; includes current-sharing capability and PMBus interface. | Suitable for higher-frequency, multi-phase, or digitally managed power systems - not drop-in compatible due to different pinout and feature set. | Select LTC3850EGN#PBF only if programmable frequency, digital control, or parallel operation is required; otherwise LTC1625IGN#PBF offers simpler, lower-cost implementation. |
| MP2307DN-LF-Z | Integrated power stage (MOSFETs built-in); fixed 500kHz frequency; 4.5–28V input; no VDS sensing - uses external sense resistor. | Targeted at cost-sensitive, medium-current (<3A) applications where board space is less constrained than component count. | Choose MP2307DN-LF-Z for simplified BOM and layout when integrated FETs meet current needs; LTC1625IGN#PBF remains preferred for >4A, high-efficiency, or wide-VIN designs. |
Compared with LTC3850EGN#PBF and MP2307DN-LF-Z, the LTC1625IGN#PBF uniquely combines no-RSENSE operation, 36V input tolerance, and Burst Mode™ in a compact SSOP package - making it optimal for high-efficiency, battery-critical, and thermally constrained synchronous buck applications where external MOSFET flexibility is needed.
Availability
LTC1625IGN#PBF is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1625IGN#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 semiconductors.
The LTC1625IGN#PBF belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for synchronous step-down conversion in portable, battery-powered, and wide-input industrial systems where efficiency, thermal performance, and reliability are paramount.
FAQ
What is the maximum input voltage rating for the LTC1625IGN#PBF?
The LTC1625IGN#PBF has an absolute maximum input voltage rating of 36V on the VIN and TK pins. Operation is specified from 3.7V to 36V, with industrial-grade versions (e.g., LTC1625IGN#PBF) requiring minimum 3.9V at –40°C ambient. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
Does the LTC1625IGN#PBF require an external current-sense resistor?
No, the LTC1625IGN#PBF does not require an external current-sense resistor. It implements MOSFET VDS sensing using dedicated TK (top Kelvin sense) and SW pins to measure conduction voltage across the external top N-MOSFET, eliminating sense resistor losses and PCB area while maintaining accurate current-mode control.
How is the output voltage programmed on the LTC1625IGN#PBF?
The LTC1625IGN#PBF supports three output voltage configurations: (1) adjustable via external resistor divider from VOSENSE to ground; (2) fixed 3.3V when VPROG < 0.8V; (3) fixed 5V when VPROG > 3.5V. Leaving VPROG open enables the adjustable mode. All configurations use the same ±1% 1.19V internal reference.
What package type is used for the LTC1625IGN#PBF?
The LTC1625IGN#PBF is packaged in a 16-lead narrow SSOP (Small Outline Package), also designated GN package per Linear/Analog Devices ordering nomenclature. It measures 4.9mm × 6.0mm with 0.15mm lead pitch and has a thermal resistance θJA of 130°C/W.
Can the LTC1625IGN#PBF operate in forced continuous conduction mode?
Yes, the LTC1625IGN#PBF supports forced continuous conduction mode via the FCB (Forced Continuous Bias) pin. Pulling FCB below 1.19V disables Burst Mode™ operation, ensuring uninterrupted switching even at light loads - critical for maintaining regulation on auxiliary windings or meeting strict transient response requirements.
LTC1625IGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (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):
- 3.9V ~ 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-SSOP
LTC1625IGN#PBF FAQ
1.How can I place an order for LTC1625IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1625IGN#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 LTC1625IGN#PBF reliable?
The price and inventory of LTC1625IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1625IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1625IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1625IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1625IGN#PBF?
LTC1625IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1625IGN#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 LTC1625IGN#PBF?
For technical support, including LTC1625IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1625IGN#PBF requirements.
6.How does Aetrix verify that LTC1625IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1625IGN#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 LTC1625IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1625IGN#PBF?
All LTC1625IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1625IGN#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 LTC1625IGN#PBF part is unused and in its original packaging.
Return procedure for LTC1625IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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