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Analog Devices Inc. LTC1775IGN#TRPBF
- Part No.:
- LTC1775IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1775IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BCK-BST 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,649
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Product details
Overview
LTC1775IGN#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, supports 150kHz fixed or synchronized frequency, and enables >99% duty-cycle operation for ultra-low dropout. It is used in high-efficiency notebook DC/DC power supplies.
For engineers reviewing the LTC1775IGN#TRPBF datasheet, LTC1775IGN#TRPBF pinout, LTC1775IGN#TRPBF application, or LTC1775IGN#TRPBF equivalent, key selection criteria include its no-RSENSE architecture, programmable output voltage (1.19V/3.3V/5V), forced continuous mode control, Burst Mode™ efficiency optimization at light load, and integrated overvoltage/foldback protection.
Technical Context
The LTC1775IGN#TRPBF implements current-mode control via MOSFET VDS sensing-eliminating external sense resistors-and uses an internal 1.19V reference with ±1% accuracy across temperature. Its error amplifier (ITH pin) sets peak inductor current, while VOSENSE and VPROG jointly determine feedback topology and output voltage selection (open, 0V, or INTVCC).
It features dual gate drivers (TG/BG) optimized for logic-level N-MOSFETs, a bootstrap-based high-side drive (BOOST/SW/TG), and a dedicated Kelvin sense pin (TK) for accurate top-FET VDS measurement. The oscillator supports injection locking to external clocks over a 1.5:1 range (e.g., 100–150kHz or 150–225kHz), and the FCB pin disables Burst Mode to enforce continuous conduction for secondary winding regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-input industrial and automotive battery systems, including 12V/24V rails and notebook adapters. |
| Output Voltage Range | 1.19V to VIN - adjustable via external divider or pin-selectable 3.3V/5V outputs; 1.19V reference enables precise low-voltage regulation. |
| Max Current Sense Threshold | 300mV - enables high-current designs using MOSFET RDS(ON) as sense element, eliminating power loss and board space of shunt resistors. |
| Oscillator Frequency | 150kHz nominal, syncable 100–225kHz - balances efficiency (lower f) and size (higher f); injection lock ensures system-level clock coherence. |
| Shutdown Quiescent Current | <30µA - extends battery runtime in portable systems during standby or deep sleep modes. |
| Duty Cycle Capability | Up to 99% - supports ultra-low dropout operation near VIN ≈ VOUT, critical for battery-powered applications nearing end-of-discharge. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability; junction limit 125°C with θJA = 130°C/W (SSOP package). |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 5.3mm × 6.2mm, 0.635mm pitch, exposed pad not present. Compatible with standard reflow profiles; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC power source selector | Switches internal LDO off when ≥4.7V applied-enables high-efficiency self-powered INTVCC from converter output or auxiliary rail. |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (100–225kHz); rising edge triggers TG turn-on; enables deterministic timing across multiple converters. |
| RUN/SS (3) | Enable & soft-start control | Pull <0.8V to shut down; capacitor to ground sets ramp time (~1s/µF); internal 3µA current source enables controlled startup sequencing. |
| FCB (4) | Forced continuous mode enable | Tie to GND to disable Burst Mode-ensures minimum switching at light load for stable secondary winding regulation or noise-sensitive loads. |
| ITH (5) | Error amplifier output / current threshold | Voltage (0–2.4V) sets peak inductor current; directly controls loop gain and transient response; compensation network connects here. |
| SGND (6) | Signal ground reference | Return for VOSENSE, VPROG, ITH, and feedback network-must be star-connected to COUT(–) to avoid ground bounce errors. |
| VOSENSE (7) | Feedback voltage input | Monitors regulated output via remote sense or resistive divider; referenced to SGND; determines regulation setpoint with VPROG. |
| VPROG (8) | Output voltage configuration | Open → 1.19V (adjustable); 0V → 3.3V; INTVCC → 5V-enables three preset outputs without external resistors. |
| PGND (9) | Power ground return | Source connection for bottom MOSFET, CIN(–), and CVCC(–); separates high di/dt power return from signal ground. |
| BG (10) | Bottom N-MOSFET gate driver | Drives M2 gate between PGND and INTVCC (5.2V); designed for fast rise/fall (50–150ns) into 3300pF load. |
| INTVCC (11) | Internal 5.2V regulator output | Supplies TG/BG drivers and core logic; requires ≥4.7µF low-ESR tantalum or ceramic decoupling to PGND. |
| BOOST (12) | Bootstrap supply for top gate driver | Connects to (+) terminal of bootstrap capacitor; swings from ~INTVCC–0.3V to VIN+INTVCC; enables high-side N-MOSFET drive. |
| TG (13) | Top N-MOSFET gate driver | Drives M1 gate with swing equal to INTVCC superimposed on SW node; requires careful PCB layout to minimize shoot-through risk. |
| SW (14) | Switch node | Connects to (–) terminal of bootstrap capacitor and drain of M2; swings from ~–0.3V to VIN; high di/dt node requiring minimized loop area. |
| TK (15) | Top MOSFET Kelvin sense | Must route separately from VIN to top-FET drain-rejects PCB trace resistance and improves current-sense accuracy under high load. |
| VIN (16) | Main input supply | 4V–36V input; requires RC filter (1Ω + 0.1µF) for >3A applications to suppress high-frequency noise coupling into control circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE current sensing | Uses MOSFET VDS to measure inductor current-eliminates 0.5–2W sense resistor losses and associated thermal management. |
| Burst Mode™ operation | Reduces switching losses at light load by gating bursts of full cycles; maintains high efficiency down to µA load levels in battery systems. |
| Programmable output voltage | Three factory-configurable outputs (1.19V/3.3V/5V) selected via VPROG pin-reduces BOM count and eliminates external resistor networks. |
| Output overvoltage protection | Hardware comparator trips at 1.28V (±0.04V) on VOSENSE-immediately disables TG and enables BG to clamp overshoot before damage occurs. |
| Foldback current limiting | Reduces peak current from 300mV to ~80mV during output short-limits fault power dissipation and prevents thermal runaway in sustained shorts. |
| Forced continuous mode control | FCB pin allows disabling Burst Mode independently-essential for maintaining regulation on auxiliary windings in multi-output flyback-derived topologies. |
Applications
| High-Efficiency Notebook Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Primary 5V or 3.3V rail generation from 12V battery in ultrabook platforms with strict thermal and efficiency targets. IC Role / Device Role / Timing Role: Synchronous buck controller managing dual N-MOSFET power stage; regulates output using VDS-based current sensing and 150kHz switching. Use Value: Eliminates sense resistor losses (up to 1.5W at 10A), enabling >94% efficiency at full load and extending battery life by 12–18 minutes per charge cycle. |
Use Scenario: 3.3V supply for microcontroller, CAN transceiver, and sensor interface in vehicle body electronics with 9–16V unregulated input. IC Role / Device Role / Timing Role: Industrial-grade DC/DC controller providing stable low-noise 3.3V output; withstands cold-crank (4.3V min) and load-dump transients. Use Value: –40°C to +85°C operation and 300mV current threshold ensure reliable start-up and current limiting across automotive temperature extremes. |
| Battery Charger Auxiliary Supply | Distributed Telecom Power |
|
Use Scenario: Standby 3.3V rail for charger monitoring IC and communication interface during battery charging and maintenance phases. IC Role / Device Role / Timing Role: Low-quiescent controller operating in Burst Mode at µA loads; enabled via RUN/SS pin for sequenced power-up. Use Value: <30µA shutdown current and programmable soft-start prevent inrush into downstream capacitors, reducing stress on AC/DC front-end. |
Use Scenario: Point-of-load (POL) 5V supply in 48V telecom shelf, feeding FPGA I/O banks and SerDes power domains. IC Role / Device Role / Timing Role: High-input buck controller synchronized via SYNC pin to system master clock-minimizing EMI peaks and enabling deterministic timing. Use Value: 1.5:1 sync range and injection lock allow tight frequency alignment across dozens of POL converters, simplifying EMI filter design and compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610IMSE#TRPBF | Integrated power MOSFETs (42V IN, 3.5A), 2MHz switching, lower IQ (2.5µA), but no VDS sensing or programmable VOUT. | Best for compact, medium-current designs where board space > efficiency; unsuitable for >10A or no-shunt requirements. | Select LT8610IMSE#TRPBF only if integrated FETs and ultra-low IQ outweigh need for high-current scalability and RSENSE-free operation. |
| TPS546D24RSAR | 40V IN, 60A capable, PMBus-enabled digital controller with telemetry; requires external MOSFETs but uses current-sense amplifiers-not VDS sensing. | Targeted at server/enterprise POL with digital monitoring; lacks Burst Mode and analog simplicity of LTC1775IGN#TRPBF. | Choose TPS546D24RSAR when telemetry, margining, and dynamic loop adjustment are required-avoid if analog simplicity and minimal external components are priorities. |
Compared with LT8610IMSE#TRPBF and TPS546D24RSAR, the LTC1775IGN#TRPBF uniquely combines no-RSENSE operation, pin-selectable outputs, and industrial temperature range in a cost-optimized analog controller-making it optimal for high-current, efficiency-critical, non-digital power stages.
Availability
LTC1775IGN#TRPBF is available at Aetrix Electronics and suitable for high-efficiency notebook power, automotive body control modules, and distributed telecom power applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade temperature performance.
Supply support for LTC1775IGN#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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1775IGN#TRPBF belongs to ADI's legacy Linear Technology power controller family, engineered specifically for high-current, high-efficiency synchronous buck conversion in space- and thermal-constrained systems where sense-resistor elimination is critical.
FAQ
What is the maximum input voltage rating for the LTC1775IGN#TRPBF?
The LTC1775IGN#TRPBF has an absolute maximum input voltage (VIN, TK pins) of 36V. Operation above this level risks permanent damage. For reliable long-term use, the recommended maximum continuous input is 36V, with transient spikes limited to ≤36V per the Absolute Maximum Ratings table. The BOOST pin tolerates up to 42V, but this is not an input supply rating.
Does the LTC1775IGN#TRPBF require an external current-sense resistor?
No, the LTC1775IGN#TRPBF does not require an external current-sense resistor. It implements No RSENSE technology by measuring the voltage drop (VDS) across the external top N-channel MOSFET to derive inductor current-reducing power loss, board area, and thermal design complexity. This is confirmed in the Features list and Functional Diagram.
How is the output voltage configured on the LTC1775IGN#TRPBF?
The LTC1775IGN#TRPBF supports three output voltage configurations via the VPROG pin: open circuit selects 1.19V (adjustable via external divider), 0V selects 3.3V, and connection to INTVCC selects 5V. These settings are validated in the Electrical Characteristics table under "VOUT Regulated Output Voltage" and are independent of VOSENSE connection method.
What protection features does the LTC1775IGN#TRPBF include?
The LTC1775IGN#TRPBF integrates foldback current limiting (reducing peak current from 300mV to ~80mV during short circuits), output overvoltage lockout (trips at 1.28V on VOSENSE), and thermal shutdown (junction limit 125°C). These are documented in the Features section and Electrical Characteristics table under VOVL and foldback descriptions.
Can the LTC1775IGN#TRPBF synchronize to an external clock?
Yes, the LTC1775IGN#TRPBF supports external clock synchronization via the SYNC pin. It can injection-lock to frequencies from 100kHz to 225kHz (1.5:1 range around nominal 150kHz), with clock high time between 1µs and 4µs. This capability is specified in the Oscillator section and Typical Performance Characteristics (Figure G12).
LTC1775IGN#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC1775IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1775IGN#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 LTC1775IGN#TRPBF reliable?
The price and inventory of LTC1775IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1775IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1775IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1775IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1775IGN#TRPBF?
LTC1775IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1775IGN#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 LTC1775IGN#TRPBF?
For technical support, including LTC1775IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1775IGN#TRPBF requirements.
6.How does Aetrix verify that LTC1775IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1775IGN#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 LTC1775IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1775IGN#TRPBF?
All LTC1775IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1775IGN#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 LTC1775IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC1775IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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