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Analog Devices Inc. LTC1775IGN#PBF
- Part No.:
- LTC1775IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1775IGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BCK-BST 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:234
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Product details
Overview
LTC1775IGN#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 4.3V to 36V input, delivers adjustable output from 1.19V to VIN, features ±1% 1.19V reference, 150kHz nominal oscillator with 1.5:1 synchronization range, and supports forced continuous or Burst Mode operation - used in high-efficiency notebook DC/DC power supplies.
For engineers reviewing the LTC1775IGN#PBF datasheet, LTC1775IGN#PBF pinout, LTC1775IGN#PBF application, or LTC1775IGN#PBF equivalent, key selection considerations include VDS-based current sensing capability, INTVCC/EXTVCC power routing options, FCB-controlled mode selection, thermal derating of RDS(ON)-limited peak current, and SYNC pin injection-locking behavior across temperature.
Technical Context
The LTC1775IGN#PBF implements constant-frequency current-mode control using MOSFET VDS sensing for primary-side current measurement, eliminating external sense resistors and reducing 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) with 2A peak sink/source capability, a 5.2V internal LDO (INTVCC), bootstrap-based high-side drive (BOOST/SW/TG), and protection circuitry including foldback current limiting (300mV → 80mV threshold reduction during short-circuit) and output overvoltage lockout (1.24–1.32V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.3V to 36V - supports automotive battery, industrial 24V, and wide-input DC systems without pre-regulation. |
| Output Voltage Range | 1.19V to VIN - enables low-voltage core supplies (e.g., 1.2V, 1.8V, 3.3V, 5V) via VPROG pin selection or external divider. |
| Oscillator Frequency | 135–165kHz (nominal 150kHz), synchronizable 100–225kHz - allows EMI reduction via spread-spectrum or system clock alignment. |
| Current Sense Threshold | 260–340mV max - sets peak inductor current limit as 300mV/RDS(ON)(TOP), enabling high-current designs with logic-level MOSFETs. |
| Reference Accuracy | ±1% at 1.19V over full temp range - ensures tight output regulation in precision computing and instrumentation rails. |
| Shutdown Current | <30µA - extends battery life in portable equipment during standby or sleep modes. |
| Operating Temp Range | –40°C to +85°C (Industrial grade) - qualified for under-hood automotive, industrial control, and telecom environments. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 5.3mm × 6.2mm body, 0.65mm pitch - compatible with standard surface-mount reflow processes and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | External INTVCC supply input | Switches internal LDO off when >4.7V; enables efficient self-powered operation from output rail. |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (100–225kHz); rising edge triggers TG turn-on; 1.2V threshold enables frequency scaling. |
| RUN/SS (3) | Enable and soft-start control | Pull <0.8V for shutdown; capacitor-to-ground sets ramp time (~1s/µF); internal 3µA current source enables controlled startup. |
| FCB (4) | Forced continuous mode control | Tie to ground to disable Burst Mode; tie to INTVCC to enable Burst Mode; used for secondary winding regulation support. |
| ITH (5) | Error amplifier compensation node | Voltage (0–2.4V) sets peak inductor current threshold; clamped at 0.95V during Burst Mode for low-load efficiency. |
| SGND (6) | Signal ground reference | Return path for VOSENSE, VPROG, and feedback network; must connect to COUT negative terminal to minimize noise coupling. |
| VOSENSE (7) | Output voltage feedback input | High-impedance (10nA typical) sense node; accepts direct connection to output or remote sensing via resistive divider. |
| VPROG (8) | Output voltage programming select | 0V = 3.3V output; open or INTVCC = 5V output; open with external divider = 1.19V-adjustable output. |
| VIN (16) | Main input supply | Power source for internal circuits when EXTVCC is inactive; requires RC filter (1Ω + 0.1µF) above 3A loads. |
| TK (15) | Top MOSFET Kelvin sense | Separate trace to top MOSFET drain - isolates VDS sensing from VIN power plane noise and improves current accuracy. |
| SW (14) | Switch node | Connects to inductor and bootstrap capacitor negative terminal; swings from ~–0.5V to VIN; critical for layout EMI control. |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate with swing = INTVCC superimposed on SW node voltage; 2A peak drive supports fast turn-on. |
| BOOST (12) | Bootstrap capacitor positive terminal | Swings from Schottky drop below INTVCC to VIN + INTVCC; requires low-ESR ceramic capacitor (≥0.33µF) for reliable high-side drive. |
| INTVCC (11) | Internal 5.2V regulator output | Supplies gate drivers and control logic; requires ≥4.7µF tantalum/low-ESR capacitor to PGND for stability under transient load. |
| BG (10) | Bottom gate driver output | Drives bottom N-MOSFET gate between PGND and INTVCC; complements TG for synchronous rectification and reduced conduction loss. |
| PGND (9) | Power ground return | Low-impedance return for bottom MOSFET source, CVCC, and CIN negative; must be separate from SGND to avoid ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Uses MOSFET VDS detection instead of shunt resistor - eliminates 0.5–2W sense losses and PCB area in high-current (>10A) applications. |
| Dual N-channel synchronous drive | Integrated TG/BG drivers eliminate need for external level shifters or discrete gate drivers - simplifies design and reduces BOM count. |
| Programmable fixed-frequency + sync | 150kHz base frequency with 1.5:1 locking range - enables deterministic EMI management and multi-rail synchronization in complex systems. |
| Forced continuous mode control | FCB pin disables Burst Mode independently of load - essential for maintaining regulation on auxiliary windings in multi-output flyback-derived topologies. |
| Logic-controlled micropower shutdown | <30µA IQ in shutdown - meets stringent energy-saving requirements for battery-backed systems and always-on subsystems. |
| Output overvoltage protection | 1.24–1.32V OV threshold with automatic shutdown - prevents damage to downstream ICs during transient faults or feedback loop failure. |
Applications
| Notebook CPU Core Supply | Automotive Infotainment Power |
|---|---|
Use Scenario: Regulating 1.2V/15A CPU core rail from 12V battery or 19V adapter with tight transient response and thermal headroom. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dual-phase N-MOSFETs, VDS-based current sensing, and adaptive burst/continuous mode. Use Value: Achieves >92% efficiency at full load while maintaining ±1% output accuracy and supporting dynamic voltage scaling via ITH modulation. |
Use Scenario: Generating 5V/8A system rail for display, audio DSP, and CAN interface modules in vehicle head units operating from 9–16V battery. IC Role / Device Role / Timing Role: High-reliability buck controller with –40°C to +85°C rating, input undervoltage lockout (4.3V min), and robust EMI performance per CISPR-25 Class 5. Use Value: Eliminates external sense resistor heating issues in confined enclosures and enables seamless synchronization with infotainment SoC clock domain. |
| Battery Charger Auxiliary Rail | Distributed Telecom Power |
Use Scenario: Providing isolated 3.3V/3A bias supply for charger controller ICs and communication interfaces in multi-cell Li-ion charging stations. IC Role / Device Role / Timing Role: Secondary-side synchronous buck controller powered from main converter output, using EXTVCC self-supply and RUN/SS sequencing. Use Value: Reduces standby power consumption via Burst Mode and enables precise soft-start coordination with primary converter using shared CSS capacitor. |
Use Scenario: Stepping down 48V backplane to 12V/10A intermediate bus in modular telecom shelf with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: Industrial-grade buck controller driving paralleled SUD50N03-10 MOSFETs, leveraging TK Kelvin sensing for accurate current limiting across temperature. Use Value: Supports long-term operation at 85°C ambient with validated thermal margin and provides fault coverage via foldback current limiting and OV shutdown. |
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 | Monolithic 42V input, 3.5A integrated buck; no external MOSFETs; 2MHz switching; higher IQ (2.5µA shutdown) | Lower current, higher frequency, smaller solution size; lacks VDS sensing and programmable sync range | Select LT8610EMSE#PBF for space-constrained <5A applications where integration outweighs flexibility; LTC1775IGN#PBF preferred for >10A scalable designs. |
| TPS54620RGYT | 6V–18V input, 6A monolithic buck; integrated MOSFETs; 2.5V–15V VREF range; no VDS sensing; 3.5ms soft-start fixed | Lower input voltage ceiling; no TK/Kelvin sense; limited thermal performance at 85°C ambient | Choose TPS54620RGYT for cost-sensitive 12V-input systems under 6A; LTC1775IGN#PBF remains optimal for wide-VIN, high-current, or thermally demanding deployments. |
Compared with LT8610EMSE#PBF and TPS54620RGYT, the LTC1775IGN#PBF offers unique VDS-based current sensing for ultra-low-loss high-current operation, industrial temperature range, and flexible external MOSFET selection - making it irreplaceable in >10A, wide-input, or thermally constrained synchronous buck designs.
Availability
LTC1775IGN#PBF is available at Aetrix Electronics and suitable for notebook power systems, automotive infotainment modules, and distributed telecom power supplies requiring stable component supply, long-lifecycle support, and guaranteed industrial-grade temperature performance.
Supply support for LTC1775IGN#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 and maintains its legacy high-performance analog and power management product lines with full datasheet, simulation model, and application support.
The LTC1775IGN#PBF belongs to Linear's high-efficiency current-mode buck controller family, designed specifically for high-current, wide-input DC/DC conversion in computing, automotive, and industrial systems where MOSFET RDS(ON) utilization and thermal management are critical.
FAQ
What is the minimum input voltage specification for LTC1775IGN#PBF?
The LTC1775IGN#PBF has a minimum input voltage of 4.3V at –40°C ambient (industrial grade). At 25°C, operation begins at 4V. This higher cold-temperature threshold ensures reliable startup and gate drive strength for external N-MOSFETs under low-battery conditions in automotive and industrial applications. The LTC1775IGN#PBF datasheet specifies this explicitly in Note 5 of the Absolute Maximum Ratings table.
How does the LTC1775IGN#PBF achieve current sensing without a sense resistor?
The LTC1775IGN#PBF uses MOSFET VDS sensing via the TK (Kelvin sense) and SW pins to measure current through the top N-channel MOSFET during conduction. This eliminates external sense resistors and associated power loss. The controller compares the sensed VDS against an internal 300mV threshold to determine peak inductor current. The LTC1775IGN#PBF requires careful PCB layout with separate TK routing to avoid noise coupling into the current measurement path.
Can LTC1775IGN#PBF operate in forced continuous conduction mode?
Yes, the LTC1775IGN#PBF supports forced continuous conduction mode via the FCB (Forced Continuous Bias) pin. When FCB is pulled below 1.19V (e.g., grounded), Burst Mode is disabled and the controller maintains switching even at light loads. This is essential for maintaining regulation on secondary windings in multi-output converters. The LTC1775IGN#PBF datasheet confirms this behavior in the Electrical Characteristics table (VFCB threshold) and Applications Information section.
What package type is used for LTC1775IGN#PBF?
The LTC1775IGN#PBF uses a 16-lead narrow plastic SSOP (Small Outline Package), designated GN in Linear/Analog Devices' ordering nomenclature. It measures 5.3mm × 6.2mm with 0.65mm lead pitch and is RoHS-compliant. This package provides better thermal performance than SO-16 for high-current controller applications and is clearly identified in the Package/Order Information section of the LTC1775IGN#PBF datasheet.
Does LTC1775IGN#PBF support external clock synchronization?
Yes, the LTC1775IGN#PBF supports external clock synchronization via the SYNC pin. It can lock to an external clock signal within a 1.5:1 frequency range centered on its nominal 150kHz oscillator (i.e., 100–225kHz). The SYNC pin has a 1.2V threshold and requires a clean clock pulse with 1–4µs high-time. This feature enables EMI reduction and system-level timing coordination - fully documented in the Oscillator section of the LTC1775IGN#PBF Electrical Characteristics table.
LTC1775IGN#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):
- 4.3V ~ 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
LTC1775IGN#PBF FAQ
1.How can I place an order for LTC1775IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1775IGN#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 LTC1775IGN#PBF reliable?
The price and inventory of LTC1775IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1775IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1775IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1775IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1775IGN#PBF?
LTC1775IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1775IGN#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 LTC1775IGN#PBF?
For technical support, including LTC1775IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1775IGN#PBF requirements.
6.How does Aetrix verify that LTC1775IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1775IGN#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 LTC1775IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1775IGN#PBF?
All LTC1775IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1775IGN#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 LTC1775IGN#PBF part is unused and in its original packaging.
Return procedure for LTC1775IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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