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Analog Devices Inc. LTC1775CGN#PBF
- Part No.:
- LTC1775CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1775CGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BCK-BST 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:180
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Product details
Overview
LTC1775CGN#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 VDS sensing. It operates from 4V to 36V input, delivers 1.19V–VIN output, features ±1% 1.19V reference, 150kHz nominal oscillator, and supports forced continuous or Burst Mode operation - ideal for high-efficiency notebook CPU core supplies.
For engineers reviewing the LTC1775CGN#PBF datasheet, LTC1775CGN#PBF pinout, LTC1775CGN#PBF application, or LTC1775CGN#PBF equivalent, key selection considerations include its no-RSENSE current sensing architecture, 300mV max sense threshold, 16-pin narrow SSOP package, temperature-rated 0°C to 70°C operation, and compatibility with logic-level N-MOSFETs in high-current DC/DC converters.
Technical Context
The LTC1775CGN#PBF implements constant-frequency 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 proportional to load demand, referenced to a stable 1.19V internal bandgap.
It integrates dual gate drivers (TG/BG) capable of 2A peak current, a 5.2V INTVCC LDO, programmable soft-start via RUN/SS pin, foldback current limiting, output overvoltage protection at 1.28V, and synchronization capability across 100–225kHz via the SYNC pin - enabling precise timing coordination in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Output Voltage Range | 1.19V to VIN - enables low-voltage CPU/GPU core rails and flexible point-of-load designs. |
| Reference Accuracy | ±1% at 1.19V - ensures tight output regulation under line/load/temperature variation. |
| Max Current Sense Threshold | 300mV - allows high-current operation with low RDS(ON) MOSFETs while minimizing power loss. |
| Oscillator Frequency | 135–165kHz (nominal 150kHz), syncable 1.5:1 range - balances efficiency vs. size; avoids EMI-sensitive bands. |
| Shutdown Quiescent Current | <30µA - extends battery life in portable equipment during standby. |
| Operating Temperature | 0°C to 70°C - commercial-grade thermal rating suitable for notebooks and distributed power systems. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 5.3mm × 6.2mm body, 0.65mm pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC switch input | Enables high-efficiency external supply (≥4.7V) to power internal circuitry, bypassing VIN-based LDO. |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (100–225kHz); >1.2V forces 225kHz, open/ground sets 150kHz, enables injection lock. |
| RUN/SS (3) | Enable & soft-start control | Pull <0.8V for shutdown; capacitor to ground sets ramp time (~1s/µF) for controlled startup sequencing. |
| FCB (4) | Forced continuous mode select | Tie to GND to disable Burst Mode; tie to INTVCC to enable it - critical for secondary winding regulation. |
| ITH (5) | Error amplifier compensation node | 0–2.4V control voltage sets peak inductor current threshold; used for loop compensation and current limiting. |
| SGND (6) | Signal ground reference | Return path for feedback network (VOSENSE, VPROG); must connect to COUT negative terminal. |
| VOSENSE (7) | Output voltage feedback input | High-impedance input for remote sensing or resistive divider; enables precision regulation independent of PCB drop. |
| VPROG (8) | Output voltage selection | Logic-level input: open → adjustable via VOSENSE divider; 0V → 3.3V; INTVCC → 5V - simplifies multi-rail designs. |
| VIN (16) | Main input supply | Primary power source for internal LDO and bootstrap charging; requires RC filter (1Ω + 0.1µF) above 3A. |
| TK (15) | Top MOSFET Kelvin sense | Separate trace to top MOSFET drain improves VDS sensing accuracy by eliminating PCB trace resistance error. |
| SW (14) | Switch node | Connects to inductor and bottom MOSFET source; swings from ~–0.3V to VIN - defines bootstrap capacitor return path. |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate with swing = INTVCC superimposed on SW node - requires bootstrap capacitor CB. |
| BOOST (12) | Bootstrap capacitor positive terminal | Connects to (+) of CB; swings from Schottky drop below INTVCC to VIN + INTVCC - enables high-side N-MOS drive. |
| INTVCC (11) | Internal 5.2V regulator output | Powers gate drivers and control logic; decouple with ≥4.7µF low-ESR capacitor 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 for bottom MOSFET source, CVCC, and CIN - must be low-inductance connection to minimize noise and dropout. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Uses MOSFET VDS detection to eliminate sense resistor losses, improving full-load efficiency by up to 2% in 10A applications. |
| Dual N-channel MOSFET drive | Integrated TG/BG drivers support logic-level N-MOSFETs (e.g., SUD50N03-10), enabling higher efficiency than P-channel alternatives. |
| Programmable output voltage | VPROG pin selects fixed 3.3V/5V outputs or enables adjustable configuration - reduces BOM count in multi-voltage systems. |
| Burst Mode™ operation | Reduces quiescent current to <30µA at light loads while maintaining regulation - extends runtime in battery-powered devices. |
| Output overvoltage protection | OV comparator triggers at 1.28V (typ.) to disable top MOSFET and activate bottom MOSFET - prevents damage to downstream ICs. |
| Forced continuous mode control | FCB pin disables Burst Mode to maintain minimum switching frequency - essential for cross-regulation in multi-output flyback designs. |
Applications
| Automotive Infotainment Power | Notebook CPU Core Supply |
|---|---|
Use Scenario: 12V vehicle battery powers 1.1V/20A CPU core rail in head unit with strict thermal and efficiency requirements. IC Role / Device Role / Timing Role: Primary controller for synchronous buck converter delivering tightly regulated low-voltage, high-current output. Use Value: No-RSENSE architecture minimizes heat generation in confined chassis; 99% duty cycle supports cold-crank operation down to 6V input. |
Use Scenario: 19V adapter powers 1.25V/15A processor rail in ultrabook with dynamic load steps and battery backup. IC Role / Device Role / Timing Role: High-efficiency current-mode controller managing fast transient response and seamless transition between AC/battery modes. Use Value: Burst Mode reduces idle power to <10mW; programmable soft-start prevents inrush into large output capacitance during resume-from-sleep. |
| Industrial PLC I/O Module | Telecom Distributed Power |
Use Scenario: 24V DC bus powers isolated 3.3V/5A digital I/O section requiring high immunity to voltage transients and long-term reliability. IC Role / Device Role / Timing Role: Non-isolated buck controller providing clean, well-regulated auxiliary supply with fault protection. Use Value: Foldback current limiting and OVP protect against shorted field wiring; wide 0°C–70°C rating ensures operation in uncontrolled enclosures. |
Use Scenario: 48V telecom rack supplies multiple 5V/10A intermediate buses feeding point-of-load converters in base station radios. IC Role / Device Role / Timing Role: High-current primary buck controller synchronized to system clock to suppress conducted EMI. Use Value: SYNC pin enables deterministic 200kHz operation aligned with other rails, reducing beat frequencies and easing EMI filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EMSE#PBF | Wider VIN range (4.5V–60V), integrated MOSFET drivers with higher peak current (4A), supports phase modulation. | Targeted at higher-input industrial and automotive systems; lacks no-RSENSE VDS sensing - requires external sense resistor. | Select when input exceeds 36V or when higher gate drive strength is needed; avoid if RSENSE-free operation is mandatory. |
| TPS40210DGQ | Current-mode controller with external sense resistor; 4.5V–52V input; no Burst Mode; fixed 300kHz frequency. | Designed for cost-sensitive telecom and industrial supplies; no programmable output voltage or VDS sensing. | Choose for simpler, lower-cost designs where efficiency at light load is not critical and fixed frequency suffices. |
Compared with LTC1775CGN#PBF, LTC3891EMSE#PBF offers extended input voltage and stronger gate drive but sacrifices the no-RSENSE advantage, while TPS40210DGQ provides basic current-mode control at lower cost but lacks Burst Mode, programmable outputs, and VDS sensing - making LTC1775CGN#PBF optimal for efficiency-critical, medium-input, multi-voltage applications.
Availability
LTC1775CGN#PBF is available at Aetrix Electronics and suitable for notebook computers, automotive infotainment systems, and distributed power systems requiring stable component supply, long-lifecycle support, and commercial-temperature-grade performance.
Supply support for LTC1775CGN#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 LTC1775CGN#PBF belongs to Linear's legacy high-efficiency DC/DC controller family, designed specifically for synchronous step-down conversion in space-constrained, thermally demanding applications where RSENSE-free current sensing and wide input/output flexibility are critical.
FAQ
What is the maximum input voltage rating for the LTC1775CGN#PBF?
The LTC1775CGN#PBF has an absolute maximum input voltage rating of 36V on the VIN pin. Operation is specified from 4V to 36V, with reliable start-up guaranteed down to 4.3V at elevated temperatures. Exceeding 36V risks permanent damage to internal circuitry, including the INTVCC LDO and gate drivers.
Does the LTC1775CGN#PBF require an external current-sense resistor?
No, the LTC1775CGN#PBF does not require an external current-sense resistor. It implements no-RSENSE current sensing by monitoring the VDS voltage of the top N-channel MOSFET via the TK and SW pins, converting it into a proportional current signal for the current-mode control loop.
How is the output voltage programmed on the LTC1775CGN#PBF?
The LTC1775CGN#PBF supports three output configurations: leaving VPROG open enables adjustable output via an external resistor divider on VOSENSE; pulling VPROG to GND selects 3.3V (±2.4%); pulling VPROG to INTVCC selects 5.0V (±2%). The internal reference remains 1.19V ±1% in all modes.
What is the purpose of the FCB pin on the LTC1775CGN#PBF?
The FCB (Forced Continuous Mode) pin on the LTC1775CGN#PBF controls Burst Mode operation. When pulled below 1.19V (e.g., to GND), it forces continuous switching - essential for maintaining regulation on secondary windings in multi-output converters. When tied to INTVCC, Burst Mode is enabled for improved light-load efficiency.
Can the LTC1775CGN#PBF synchronize to an external clock?
Yes, the LTC1775CGN#PBF can synchronize its internal 150kHz oscillator to an external clock applied to the SYNC pin. It locks over a 1.5:1 frequency range (e.g., 100–150kHz or 150–225kHz), with rising-edge alignment. The SYNC pin threshold is 0.9–1.2V, and clock pulses must be 1–4µs wide for reliable locking.
LTC1775CGN#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, Buck-Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 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-SSOP
LTC1775CGN#PBF FAQ
1.How can I place an order for LTC1775CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1775CGN#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 LTC1775CGN#PBF reliable?
The price and inventory of LTC1775CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1775CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1775CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1775CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1775CGN#PBF?
LTC1775CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1775CGN#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 LTC1775CGN#PBF?
For technical support, including LTC1775CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1775CGN#PBF requirements.
6.How does Aetrix verify that LTC1775CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1775CGN#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 LTC1775CGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1775CGN#PBF?
All LTC1775CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1775CGN#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 LTC1775CGN#PBF part is unused and in its original packaging.
Return procedure for LTC1775CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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