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Analog Devices Inc. LTC1775CS#TRPBF
- Part No.:
- LTC1775CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1775CS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BCK-BST 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,742
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Product details
Overview
LTC1775CS#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 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-current notebook CPU core supplies.
For engineers reviewing the LTC1775CS#TRPBF datasheet, LTC1775CS#TRPBF pinout, LTC1775CS#TRPBF application, or LTC1775CS#TRPBF equivalent, key selection criteria include its no-RSENSE architecture, 300mV max current sense threshold, 16-pin SO package, -40°C to 85°C industrial temperature grade, and compatibility with logic-level MOSFETs in high-efficiency DC/DC converters.
Technical Context
The LTC1775CS#TRPBF implements constant-frequency current-mode control using MOSFET VDS sensing to eliminate external sense resistors and reduce power loss. Its error amplifier adjusts ITH voltage based on VOSENSE feedback against a 1.19V internal reference, enabling precise output regulation across load and line variations.
It integrates dual gate drivers (TG/BG) with 5.2V INTVCC supply, supports external clock synchronization over 1.5:1 range via SYNC pin, and includes dedicated circuitry for bootstrap capacitor recharge during dropout (99% duty cycle), foldback current limiting, and output overvoltage protection at 1.28V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-input industrial and automotive battery-fed systems |
| 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 varying thermal and load conditions |
| Max Current Sense Voltage | 300mV - allows high-current operation with low RDS(ON) MOSFETs while minimizing conduction loss |
| Oscillator Frequency | 135–165kHz (nominal 150kHz) - balances efficiency and magnetics size; synchronizable up to 225kHz |
| Shutdown Quiescent Current | <30µA - extends runtime in battery-powered systems during standby |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
| Package | 16-lead SO - surface-mount compatible with standard PCB assembly and thermal relief design |
Pinout & Package
Package: 16-lead plastic SO (Small Outline), 1.27mm pitch, JEDEC MS-012AC compliant. Thermal resistance θJA = 110°C/W. Exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC switch input | Enables high-efficiency external biasing of INTVCC above 4.7V; limits voltage to 7V max |
| SYNC (2) | Oscillator synchronization input | Locks internal 150kHz oscillator to external clock over 1.5:1 range; 1.2V threshold |
| RUN/SS (3) | Run control & soft-start | Pull below 0.8V to shut down; capacitor to ground sets ramp time (~1s/µF) |
| FCB (4) | Forced continuous mode control | Tie to GND to disable Burst Mode; tie to INTVCC to enable it |
| ITH (5) | Error amplifier compensation node | Voltage sets peak inductor current threshold; 0–2.4V range controls loop gain |
| SGND (6) | Signal ground reference | Return for VOSENSE, VPROG, and feedback network; separate from PGND |
| VOSENSE (7) | Output voltage feedback input | Accepts remote sense or resistive divider; referenced to SGND |
| VPROG (8) | Output voltage selection | 0V → 3.3V, INTVCC → 5V, open → adjustable via external divider |
| VIN (16) | Main input supply | Power source for internal LDO and logic; requires RC filter for >3A applications |
| TK (15) | Top MOSFET Kelvin sense | Direct connection to top MOSFET drain for accurate VDS sensing, independent of VIN routing |
| SW (14) | Switch node | Connects to inductor and bootstrap capacitor negative terminal; swings from –0.3V to VIN |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate with swing equal to INTVCC superimposed on SW node |
| BOOST (12) | Bootstrap supply | Connects to (+) terminal of bootstrap capacitor; swings from INTVCC–0.4V to VIN+INTVCC |
| INTVCC (11) | Internal 5.2V regulator output | Powers gate drivers and internal circuits; requires ≥4.7µF low-ESR capacitor to PGND |
| BG (10) | Bottom gate driver output | Drives bottom N-MOSFET gate between PGND and INTVCC |
| PGND (9) | Power ground | Return for bottom MOSFET source, CIN, and CVCC; must be low-inductance path to minimize noise |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Uses MOSFET VDS to eliminate sense resistor losses and improve full-load efficiency by up to 2% |
| Dual N-channel synchronous drive | Integrated TG/BG drivers support logic-level MOSFETs, reducing BOM count and layout complexity |
| Programmable output voltage | VPROG pin selects 3.3V, 5V, or adjustable output - eliminates external resistor networks for common rails |
| Burst Mode operation | Reduces light-load quiescent current to <30µA and maintains >85% efficiency down to 1mA load |
| Output overvoltage protection | 1.28V OVLO threshold disables top MOSFET and activates bottom MOSFET to clamp overshoot |
| Forced continuous mode control | FCB pin enables stable regulation of secondary windings in multi-output flyback-derived topologies |
Applications
| High-Efficiency Notebook CPU Core Supply | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: Regulating 1.1V–1.5V core voltage for Intel/AMD mobile processors under dynamic load from 0.1A to 20A. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing phase alignment, current-mode loop stability, and fast transient response. Use Value: Achieves >92% peak efficiency at 15A with no sense resistor loss; Burst Mode extends battery life during idle states. |
Use Scenario: Generating stable 3.3V or 5V rail for DSPs, displays, and CAN transceivers in vehicle head units operating from 9V–16V battery. IC Role / Device Role / Timing Role: High-reliability DC/DC controller with overvoltage lockout and wide input range tolerance for cold-crank and load-dump events. Use Value: Withstands 36V transients; 125°C junction rating and industrial temp grade ensure operation in under-dash thermal environments. |
| Industrial Battery Charger Auxiliary Supply | Distributed Power System Intermediate Bus Converter |
Use Scenario: Providing isolated 5V/3A auxiliary power for microcontroller, sensors, and communication ICs in Li-ion charger modules. IC Role / Device Role / Timing Role: Secondary-side synchronous controller synchronized to primary-side clock via SYNC pin for EMI reduction. Use Value: Synchronization eliminates beat frequencies; forced continuous mode ensures clean sequencing with isolated gate drivers. |
Use Scenario: Stepping down 48V intermediate bus to 12V/10A for downstream POL converters in telecom/datacom equipment. IC Role / Device Role / Timing Role: High-current, fixed-frequency buck controller driving paralleled MOSFETs with Kelvin-sensed VDS for accuracy. Use Value: 300mV sense threshold enables use of 2mΩ MOSFETs; 99% duty cycle supports high-VIN/low-VOUT ratios without dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EDD#PBF | Wider VIN range (4.5V–60V), integrated MOSFET drivers with higher peak current (4A), supports dual-phase operation | Better suited for 48V industrial bus conversion; requires more complex layout and compensation | Select when input exceeds 36V or multi-phase scalability is required; not drop-in compatible |
| MP2918GL-Z | Lower IQ (<15µA shutdown), integrated 5V LDO, no VDS sensing (uses RSENSE), 200kHz–2MHz programmable frequency | Optimized for ultra-low-power IoT edge nodes; lacks no-RSENSE advantage and industrial temp grade | Prefer for cost-sensitive, low-IQ consumer applications where sense resistor loss is acceptable |
Compared with LTC1775CS#TRPBF, LTC3891EDD#PBF offers higher input voltage and multi-phase capability but increases system complexity, while MP2918GL-Z reduces quiescent current and simplifies biasing at the expense of no-RSENSE efficiency and temperature robustness.
Availability
LTC1775CS#TRPBF is available at Aetrix Electronics and suitable for high-current notebook power supplies, automotive infotainment systems, and industrial battery charger auxiliary rails requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1775CS#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.
The LTC1775CS#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for no-RSENSE, synchronous step-down regulation in space-constrained, thermally demanding applications.
FAQ
What is the maximum supported input voltage for the LTC1775CS#TRPBF?
The LTC1775CS#TRPBF supports an absolute maximum input voltage of 36V on the VIN pin. Operation is specified from 4V to 36V, with minimum startup voltage of 4.3V for industrial-grade parts at –40°C ambient. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
Does the LTC1775CS#TRPBF require an external current-sense resistor?
No, the LTC1775CS#TRPBF does not require an external current-sense resistor. It uses MOSFET VDS sensing via the TK and SW pins to measure inductor current, eliminating sense resistor power loss and improving efficiency - a defining feature of the LTC1775CS#TRPBF architecture.
How is output voltage selected on the LTC1775CS#TRPBF?
Output voltage on the LTC1775CS#TRPBF is selected via the VPROG pin: grounding VPROG sets 3.3V output, connecting VPROG to INTVCC sets 5V output, and leaving VPROG open enables adjustable output using an external resistive divider from VOSENSE to ground.
What is the purpose of the FCB pin on the LTC1775CS#TRPBF?
The FCB (Forced Continuous Mode) pin on the LTC1775CS#TRPBF controls Burst Mode operation. Pulling FCB below 1.19V forces continuous conduction - critical for maintaining regulation on secondary windings in multi-output converters. Tying FCB to INTVCC enables Burst Mode for improved light-load efficiency.
Is the LTC1775CS#TRPBF pin-compatible with other members of the LTC1775 family?
Yes, the LTC1775CS#TRPBF shares identical pinout and functionality with LTC1775CGN, LTC1775IGN, and LTC1775IS - all are 16-pin SO or SSOP packages with identical pin assignments and electrical behavior. Only temperature grade (C vs I) and package type differ; no PCB redesign is needed when substituting within the same package.
LTC1775CS#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, 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-SO
LTC1775CS#TRPBF FAQ
1.How can I place an order for LTC1775CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1775CS#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 LTC1775CS#TRPBF reliable?
The price and inventory of LTC1775CS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1775CS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1775CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1775CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1775CS#TRPBF?
LTC1775CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1775CS#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 LTC1775CS#TRPBF?
For technical support, including LTC1775CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1775CS#TRPBF requirements.
6.How does Aetrix verify that LTC1775CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1775CS#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 LTC1775CS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1775CS#TRPBF?
All LTC1775CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1775CS#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 LTC1775CS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1775CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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