My Inquiry
My Account
Analog Devices Inc. LTC1775CGN#TRPBF
- Part No.:
- LTC1775CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1775CGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BCK-BST 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,135
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1775CGN#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-efficiency notebook CPU core supplies.
For engineers reviewing the LTC1775CGN#TRPBF datasheet, LTC1775CGN#TRPBF pinout, LTC1775CGN#TRPBF application, or LTC1775CGN#TRPBF equivalent, key selection criteria include its no-RSENSE architecture, programmable output voltage via VPROG, 300mV max current sense threshold, 99% dropout duty cycle, and 16-lead narrow SSOP package compatibility with thermal design for >10A loads.
Technical Context
The LTC1775CGN#TRPBF implements constant-frequency current-mode control using MOSFET VDS sensing to eliminate external sense resistors. Its error amplifier adjusts ITH voltage (0–2.4V range) to regulate peak inductor current proportional to load, while internal 1.19V reference and VOSENSE feedback enable precise output voltage regulation across line and load.
It integrates dual gate drivers (TG/INTVCC-referenced top drive, BG/PGND-referenced bottom drive), a 5.2V INTVCC LDO, SYNC pin for injection-locking over 100–225kHz, FCB pin for forced continuous mode, and overvoltage protection clamping at 1.28V. Thermal shutdown activates at TJ = 125°C with θJA = 130°C/W in GN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide industrial and automotive battery inputs including 12V and 24V rails. |
| Output Voltage Range | 1.19V to VIN - adjustable down to sub-1.2V for modern low-voltage processors and ASICs. |
| Reference Accuracy | ±1% at 1.19V - ensures tight output regulation under varying temperature and load conditions. |
| Oscillator Frequency | 135–165kHz (typ. 150kHz), syncable 1.5:1 range - enables EMI reduction via external clock synchronization. |
| Max Current Sense Threshold | 260–340mV (typ. 300mV) - sets peak inductor current limit without sense resistor, enabling high-current designs. |
| Shutdown Current | 15–30µA - extends battery life in portable systems during standby or sleep modes. |
| Duty Cycle Limit | 99% - supports ultra-low dropout operation when VIN approaches VOUT, critical for battery-end-of-life operation. |
| Operating Temp Range | 0°C to 70°C (Commercial grade) - validated for ambient environments in consumer and industrial computing. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 5.3mm × 6.2mm body, 0.65mm pitch, exposed pad not present - optimized for thermal dissipation in high-current DC/DC applications with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC power source selector | Switches INTVCC supply from internal LDO to external 4.7–7V source - improves efficiency by bypassing VIN-to-5.2V conversion. |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (100–225kHz); pulls low internally when open - enables deterministic EMI management and multi-phase coordination. |
| RUN/SS (3) | Enable + soft-start control | Logic-level shutdown (≤0.8V) and 1µF capacitor ramp (≈1s/µF) - prevents inrush current and enables controlled power sequencing. |
| FCB (4) | Forced continuous mode control | Pull ≤1.19V to disable Burst Mode - essential for secondary winding regulation or noise-sensitive loads requiring constant switching. |
| ITH (5) | Error amplifier compensation node | 0–2.4V control voltage sets peak inductor current threshold - used for loop compensation and current limiting via external RC network. |
| SGND (6) | Signal ground reference | Return path for VOSENSE, VPROG, and feedback network - must be isolated from PGND to avoid noise coupling into regulation loop. |
| VOSENSE (7) | Output voltage feedback input | High-impedance sense node (10–50nA bias) - connects to output or remote sense point for accurate regulation under PCB trace IR drop. |
| VPROG (8) | Output voltage selection | 0V → 3.3V, INTVCC → 5V, open → adjustable - eliminates external resistor divider for common output voltages. |
| VIN (16) | Main input supply | 4–36V input with RC filter recommendation (1Ω + 0.1µF) - handles high di/dt transients in >3A applications. |
| TK (15) | Top MOSFET Kelvin sense | Direct connection to top MOSFET drain - enables accurate VDS sensing independent of VIN routing inductance. |
| SW (14) | Switch node | Connects to inductor and bootstrap capacitor negative terminal - swings from ≈–0.5V to VIN, requires low-inductance layout. |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate with swing = INTVCC superimposed on SW node - requires low-ESR bootstrap capacitor (≥0.33µF). |
| BOOST (12) | Bootstrap capacitor positive terminal | Swings from INTVCC – 0.4V to VIN + INTVCC - powers TG driver during high-side conduction; Schottky diode required. |
| INTVCC (11) | Internal 5.2V regulator output | Supplies gate drivers and internal circuitry; decoupled with ≥4.7µF tantalum - critical for stable high-current switching. |
| BG (10) | Bottom gate driver output | Drives bottom N-MOSFET gate between PGND and INTVCC - enables synchronous rectification with <150ns transition times. |
| PGND (9) | Power ground return | Return for bottom MOSFET source, CIN(–), and CVCC(–) - must be low-impedance plane separate from SGND to minimize noise. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Uses MOSFET VDS to measure inductor current - eliminates 5–10W sense resistor losses and PCB area in >10A designs. |
| Burst Mode™ operation | Reduces quiescent current to <30µA at light loads - extends runtime in battery-powered systems without compromising regulation accuracy. |
| Programmable output voltage | VPROG pin selects 1.19V (adjustable), 3.3V, or 5V outputs - simplifies BOM by removing external resistor dividers for standard logic rails. |
| 99% dropout duty cycle | Enables operation with VIN as low as VOUT + 100mV - maintains regulation through full battery discharge in 3.3V/5V portable systems. |
| Output overvoltage lockout | Shuts down top MOSFET if VOSENSE exceeds 1.28V - protects downstream ICs from transient overshoot during load dump or startup. |
| Foldback current limiting | Reduces peak current from 300mV to 80mV during short-circuit - limits fault power dissipation and enables safe auto-recovery. |
Applications
| High-Efficiency Notebook CPU Core Supply | Automotive Infotainment Power Rail |
|---|---|
|
Use Scenario: Regulating 1.1–1.3V at up to 15A for Intel/AMD mobile processors under dynamic load from 0.1A to full scale. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dual N-MOSFET power stage with VDS-based current sensing and adaptive Burst Mode. Use Value: Achieves >92% efficiency at 10A/1.2V with no sense resistor loss, while 99% dropout sustains operation down to 3.0V battery input. |
Use Scenario: Generating stable 3.3V or 5V from 9–16V automotive battery for display controllers, audio codecs, and USB hubs. IC Role / Device Role / Timing Role: High-input-voltage buck controller with 36V absolute max rating, integrated OVP, and -40°C to 85°C qualified variants (LTC1775I). Use Value: Withstands load dump transients up to 36V and provides clean, low-noise output via forced continuous mode (FCB pin) for EMI-sensitive infotainment modules. |
| Industrial Battery Charger Auxiliary Supply | Distributed Telecom Power System |
|
Use Scenario: Providing isolated 5V/2A auxiliary bias for charger ICs, fans, and status LEDs in 24V/48V lithium-ion charging systems. IC Role / Device Role / Timing Role: Secondary buck controller powered from main converter output (via EXTVCC), enabling >95% system efficiency. Use Value: EXTVCC pin allows direct powering from 5V rail - eliminates standalone LDO, reduces component count, and improves thermal performance. |
Use Scenario: Point-of-load regulation for FPGA I/O banks (3.3V) or DDR memory termination (1.5V) in 48V intermediate bus architectures. IC Role / Device Role / Timing Role: Synchronous buck controller synchronized to system clock via SYNC pin - eliminates beat frequencies and eases EMI compliance. Use Value: 1.5:1 sync range (100–225kHz) enables precise frequency alignment across multiple LTC1775CGN#TRPBF channels in multi-rail systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP24894GQ-Z | Fixed 500kHz frequency, integrated MOSFETs (30V/8A), no VDS sensing - uses external sense resistor. | Lower BOM count but limited to ≤8A; lacks programmable VPROG and Burst Mode optimization for battery systems. | Select MP24894GQ-Z only for space-constrained ≤8A applications where fixed frequency and integration outweigh efficiency trade-offs. |
| LTC3891IFE#PBF | 4–60V input, dual-output, includes PMBus interface and digital margining - higher complexity and cost. | Targeted at high-reliability industrial/telecom systems requiring telemetry, fault logging, and remote configuration. | Choose LTC3891IFE#PBF when system-level monitoring, redundancy, or multi-rail coordination is required beyond basic regulation. |
Compared with MP24894GQ-Z and LTC3891IFE#PBF, the LTC1775CGN#TRPBF uniquely balances high-current capability (no RSENSE), flexible output programming, and ultra-low-light-load IQ - making it optimal for cost-sensitive, efficiency-critical 10–20A applications without digital control requirements.
Availability
LTC1775CGN#TRPBF is available at Aetrix Electronics and suitable for notebook computing power delivery, automotive infotainment subsystems, and industrial battery charger auxiliary supplies requiring stable component supply and long-term manufacturability.
Supply support for LTC1775CGN#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 acquired Linear Technology in 2017 and maintains full technical support, datasheet documentation, and long-term product availability for legacy Linear parts including the LTC1775 series.
The LTC1775 belongs to Linear's high-efficiency DC/DC controller family designed specifically for high-current, no-RSENSE synchronous buck applications in portable and industrial power systems where thermal performance and light-load efficiency are critical.
FAQ
What is the maximum output current supported by the LTC1775CGN#TRPBF?
The LTC1775CGN#TRPBF itself does not set a hard current limit - it controls external MOSFETs. Maximum output current depends on MOSFET RDS(ON), thermal design, and layout. With typical 3mΩ MOSFETs and proper heatsinking, the LTC1775CGN#TRPBF enables >15A continuous output while maintaining <300mV sense threshold and stable current-mode operation.
Does the LTC1775CGN#TRPBF require an external current-sense resistor?
No. The LTC1775CGN#TRPBF uses MOSFET VDS sensing via TK and SW pins to measure inductor current - eliminating the need for a discrete sense resistor, associated power loss, and PCB area. This architecture is central to its "No RSENSE" feature and high-efficiency operation.
How does the VPROG pin configure output voltage on the LTC1775CGN#TRPBF?
The LTC1775CGN#TRPBF's VPROG pin selects preset outputs: open → adjustable (via VOSENSE divider), 0V → 3.3V, INTVCC → 5V. This eliminates external resistors for common rails. When VPROG is open, VOSENSE connects directly to output for precision regulation; no internal divider is active unless VPROG is asserted.
What is the purpose of the FCB pin on the LTC1775CGN#TRPBF?
The FCB (Forced Continuous Mode) pin on the LTC1775CGN#TRPBF disables Burst Mode operation when pulled below 1.19V. This ensures constant switching frequency - critical for secondary winding regulation in flyback-derived supplies or noise-sensitive analog circuits where variable-frequency operation causes interference.
Can the LTC1775CGN#TRPBF operate with input voltage below 4.3V?
The LTC1775CGN#TRPBF (Commercial grade) is specified for 4V minimum input. Operation below 4.3V is possible but not guaranteed across temperature - the LTC1775I variant is rated for 4.3V min at –40°C. Below 4V, INTVCC may drop out, causing gate driver failure and loss of regulation; use EXTVCC or pre-regulation for sub-4V inputs.
LTC1775CGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (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-SSOP
LTC1775CGN#TRPBF FAQ
1.How can I place an order for LTC1775CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1775CGN#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 LTC1775CGN#TRPBF reliable?
The price and inventory of LTC1775CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1775CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1775CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1775CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1775CGN#TRPBF?
LTC1775CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1775CGN#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 LTC1775CGN#TRPBF?
For technical support, including LTC1775CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1775CGN#TRPBF requirements.
6.How does Aetrix verify that LTC1775CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1775CGN#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 LTC1775CGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1775CGN#TRPBF?
All LTC1775CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1775CGN#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 LTC1775CGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1775CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1775CGN#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
