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Analog Devices Inc. LTC1775CS#PBF
- Part No.:
- LTC1775CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1775CS#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BCK-BST 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:641
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Product details
Overview
LTC1775CS#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external dual N-channel MOSFETs for high-efficiency DC/DC conversion. It features no-RSENSE VDS current sensing, 150kHz nominal fixed-frequency operation with injection-lock synchronization, ±1% 1.19V reference, and 99% duty-cycle dropout capability - enabling stable 10A output in notebook computer power rails.
For engineers reviewing the LTC1775CS#PBF datasheet, LTC1775CS#PBF pinout, LTC1775CS#PBF application, or LTC1775CS#PBF equivalent, this controller is selected for high-current, wide-input (4V–36V), adjustable-output (1.19V–VIN) buck designs requiring burst-mode efficiency at light load and robust overvoltage/foldback protection.
Technical Context
The LTC1775CS#PBF implements constant-frequency current-mode control using MOSFET VDS sensing to eliminate external sense resistors. Its error amplifier drives the ITH pin (0–2.4V range) to set peak inductor current, while internal 1.19V reference and programmable VPROG pin support 3.3V/5V/adjustable outputs via resistor divider or direct selection.
Synchronization is achieved via the SYNC pin, accepting external clocks from 100% to 150% of nominal 150kHz (i.e., 135–225kHz), with lock-in confirmed across 1.5:1 ratio. Burst Mode operation activates when ITH falls below 0.95V, clamping peak current to ~60mV/RDS(ON), and disables automatically when FCB < 1.19V forces continuous conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports automotive battery input, industrial 24V rails, and wide-range adapter inputs without pre-regulation. |
| VOUT Range | 1.19V to VIN - enables direct 3.3V/5V generation or low-voltage core supplies down to sub-1.2V with external divider. |
| Oscillator Frequency | 135–165kHz (typ. 150kHz), synchronizable to 100–225kHz - balances MOSFET switching loss vs. inductor size in high-current designs. |
| Current Sense Threshold | 260–340mV (typ. 300mV) - sets maximum peak inductor current without RSENSE, enabling high-current operation with logic-level MOSFETs. |
| Reference Accuracy | ±1% at 1.19V over temperature - ensures tight output regulation for CPU/memory rail requirements in portable systems. |
| Shutdown Current | <30µA - extends battery runtime in standby mode for notebook and portable equipment applications. |
| Operating Temp Range | 0°C to 70°C (Commercial grade) - validated for ambient conditions in consumer and industrial edge computing enclosures. |
Pinout & Package
Package: 16-lead narrow SO (Small Outline) - surface-mount, RoHS-compliant, 110°C/W θJA, footprint compatible with standard SO-16 assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC Power Switch Input | Accepts 4.5–7V external supply to bypass internal LDO; reduces power loss when VOUT ≥ 4.7V is available. |
| SYNC (2) | Oscillator Synchronization Input | Enables clock injection lock across 1.5:1 frequency range; open or grounded = 150kHz; >1.2V = 225kHz. |
| RUN/SS (3) | Run Control & Soft-Start Capacitor Node | Pull <0.8V to shut down; capacitor to ground sets soft-start ramp time (~1s/µF) for controlled power-up sequencing. |
| FCB (4) | Forced Continuous Mode Bias | Tie to GND to disable Burst Mode; tie to INTVCC to enable Burst Mode; used for secondary-winding regulation in multi-output converters. |
| ITH (5) | Error Amplifier Compensation Output | 0–2.4V control voltage setting peak inductor current; compensation network connects here for loop stability. |
| SGND (6) | Signal Ground Reference | Return path for feedback network (VOSENSE, VPROG); must connect to COUT(–) to minimize noise coupling. |
| VOSENSE (7) | Output Voltage Feedback Input | High-impedance sense node for remote sensing or resistive divider; enables accurate regulation under PCB trace IR drop. |
| VPROG (8) | Output Voltage Selection Input | 0V = 3.3V output; INTVCC = 5V output; open = adjustable via VOSENSE divider - simplifies BOM across multiple output variants. |
| VIN (16) | Main Input Supply | 4–36V input connection; requires RC filter (1Ω + 0.1µF) for >3A applications to suppress high-frequency noise. |
| TK (15) | Top MOSFET Kelvin Sense | Direct connection to top MOSFET drain (separate from VIN) enables accurate VDS sensing independent of PCB trace resistance. |
| SW (14) | Switch Node | Connects to inductor and bootstrap capacitor (–); swings from diode-drop below GND 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; requires low-inductance path to minimize shoot-through. |
| BOOST (12) | Bootstrap Capacitor Positive Terminal | Connects to (+) of bootstrap cap; swings from Schottky drop below INTVCC to VIN + INTVCC - enables high-side N-MOSFET drive. |
| INTVCC (11) | Internal 5.2V Regulator Output | Supplies gate drivers and internal circuitry; decoupled with ≥4.7µF tantalum to PGND; powered by VIN or EXTVCC if >4.7V. |
| BG (10) | Bottom Gate Driver Output | Drives bottom N-MOSFET gate between PGND and INTVCC; complements TG for synchronous rectification and high efficiency. |
| PGND (9) | Power Ground Return | Source connection for bottom MOSFET, CIN(–), and CVCC(–); separate from SGND to isolate high di/dt return paths. |
Key Features
| Feature | Design Value |
|---|---|
| No-RSENSE VDS Sensing | Eliminates power loss and board space of external current-sense resistor; uses MOSFET's intrinsic RDS(ON) for current measurement. |
| 99% Duty-Cycle Dropout Operation | Enables ultra-low dropout regulation near VIN = VOUT; critical for battery-powered systems operating down to single-cell Li-ion voltage. |
| Programmable Burst Mode | Reduces light-load quiescent current to <30µA and maintains >85% efficiency at 10mA load - extends runtime in portable electronics. |
| Dual N-Channel MOSFET Drive | Integrated high- and low-side gate drivers support logic-level MOSFETs (VGS(th) ≤ 2.5V); eliminates need for external level shifters or P-MOSFETs. |
| Output Overvoltage Protection | Hardware comparator triggers immediate top-FET turn-off if VOUT exceeds 1.24–1.32V (1.28V typ.), preventing damage to downstream ICs. |
| Pin-Selectable Output Voltage | VPROG pin selects 3.3V (0V), 5V (INTVCC), or adjustable (open) - reduces design iterations and simplifies qualification across multiple product SKUs. |
Applications
| Notebook Computer Core Power | Automotive Infotainment Supply |
|---|---|
|
Use Scenario: Generating 3.3V/5V rails for CPU I/O, display interface, and USB controllers in ultrabook platforms with dynamic load from 10mA to 10A. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current, wide-input (9–28V automotive or 5–20V adapter) to regulated low-voltage outputs. Use Value: Burst Mode extends battery life during idle; 99% duty cycle sustains operation as battery discharges to 3.3V; VDS sensing avoids resistor thermal drift errors. |
Use Scenario: Powering DSP, FPGA, and touchscreen controllers in head-unit systems exposed to 12V/24V battery transients and cold-crank conditions. IC Role / Device Role / Timing Role: High-reliability step-down controller with OVP and foldback current limiting to survive load-dump and reverse-battery events. Use Value: ±1% reference and line/load regulation ensure stable SoC operation; wide 4–36V input accommodates cranking dips and alternator surges. |
| Industrial Battery Charger Interface | Distributed Telecom Power System |
|
Use Scenario: Providing isolated auxiliary 5V/3.3V bias for charger management ICs and communication interfaces in 24V/48V LiFePO4 charging stations. IC Role / Device Role / Timing Role: Secondary-side synchronous buck controller delivering tightly regulated bias from main DC bus, synchronized to system clock via SYNC pin. Use Value: Injection-lock synchronization eliminates beat frequencies with primary-side converters; FCB pin enables forced continuous mode for cross-regulation in multi-output designs. |
Use Scenario: Local point-of-load regulation for FPGA and ASIC cores in 48V intermediate bus architecture, where efficiency and thermal management are critical. IC Role / Device Role / Timing Role: High-current (≥10A) current-mode controller driving paralleled MOSFETs with VDS sensing to avoid sense-resistor power loss at 40A+ total loads. Use Value: 300mV max sense threshold enables use of low-RDS(ON) MOSFETs; 110°C/W θJA package supports convection-cooled industrial chassis mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610ACDE#PBF | Monolithic 3.5A buck regulator (integrated MOSFETs); 2.8–42V input; 300ns min on-time; no VDS sensing. | Lower current, smaller solution size; lacks programmable VPROG and TK pin for Kelvin sensing. | Select LT8610ACDE#PBF for compact, lower-current designs where integration outweighs flexibility; LTC1775CS#PBF preferred for >5A, high-efficiency, or custom MOSFET optimization. |
| TPS54620RGYT | 6A integrated synchronous buck; 4.5–17V input; current-mode control; no VDS sensing; 2.5V–15V VOUT range. | Fixed internal MOSFETs limit max current and thermal design freedom; no 3.3V/5V pin-selectable output. | Choose TPS54620RGYT for cost-sensitive, medium-current applications with simpler layout; LTC1775CS#PBF offers higher current scalability and superior light-load efficiency via Burst Mode. |
Compared with LT8610ACDE#PBF and TPS54620RGYT, the LTC1775CS#PBF provides higher current capability through external MOSFET selection, true no-RSENSE operation for minimal loss, and pin-selectable outputs - making it optimal for scalable, thermally demanding, or battery-sensitive 10A+ buck designs.
Availability
LTC1775CS#PBF is available at Aetrix Electronics and suitable for notebook computer power rails, automotive infotainment supplies, and industrial battery charger interfaces requiring stable component supply, long-term lifecycle support, and consistent parametric performance across commercial temperature range.
Supply support for LTC1775CS#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, serving precision, industrial, automotive, and communications markets.
The LTC1775CS#PBF belongs to Linear's legacy high-current synchronous buck controller family, designed specifically for efficiency-critical, wide-input DC/DC conversion in portable and ruggedized power systems where MOSFET RDS(ON) sensing delivers superior thermal and accuracy performance.
FAQ
What is the maximum output current supported by the LTC1775CS#PBF?
The LTC1775CS#PBF itself does not define a fixed maximum output current - it is a controller that drives external MOSFETs. With appropriately selected N-channel MOSFETs (e.g., SUD50N03-10), the LTC1775CS#PBF enables stable 10A continuous output, as verified in the典型 application circuit (Figure 1). Peak current depends on MOSFET RDS(ON), thermal design, and layout; the 300mV current sense threshold sets IPEAK ≈ 300mV / RDS(ON).
Does the LTC1775CS#PBF require an external current-sense resistor?
No, the LTC1775CS#PBF does not require an external current-sense resistor. It implements No-RSENSE™ technology by measuring the voltage drop (VDS) across the conducting top or bottom N-channel MOSFET to derive inductor current - eliminating sense-resistor power loss and board area while improving efficiency, especially at high currents.
How does the SYNC pin function on the LTC1775CS#PBF?
The SYNC pin on the LTC1775CS#PBF enables oscillator synchronization: left open or grounded → 150kHz nominal frequency; pulled above 1.2V → 225kHz; driven with external clock (135–225kHz) → injection lock with 1.5:1 frequency range. The rising edge of the external clock aligns top-MOSFET turn-on, reducing system EMI through deterministic switching.
Can the LTC1775CS#PBF be used for 3.3V and 5V outputs without external resistors?
Yes - the LTC1775CS#PBF supports pin-selectable outputs: tie VPROG to GND for 3.3V (±2.4%), tie VPROG to INTVCC for 5V (±2%), or leave VPROG open and use an external resistor divider from VOUT to VOSENSE for adjustable outputs (e.g., 1.19V–VIN). This eliminates trimming resistors in many standard voltage designs.
What protection features are built into the LTC1775CS#PBF?
The LTC1775CS#PBF integrates foldback current limiting (reducing peak current from 300mV to ~80mV during short-circuit), output overvoltage lockout (1.24–1.32V threshold), logic-controlled micropower shutdown (<30µA), and dropout counter for bootstrap capacitor recharge. These features protect both the controller and downstream loads during fault conditions without external components.
LTC1775CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (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-SO
LTC1775CS#PBF FAQ
1.How can I place an order for LTC1775CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1775CS#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 LTC1775CS#PBF reliable?
The price and inventory of LTC1775CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1775CS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1775CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1775CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1775CS#PBF?
LTC1775CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1775CS#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 LTC1775CS#PBF?
For technical support, including LTC1775CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1775CS#PBF requirements.
6.How does Aetrix verify that LTC1775CS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1775CS#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 LTC1775CS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1775CS#PBF?
All LTC1775CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1775CS#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 LTC1775CS#PBF part is unused and in its original packaging.
Return procedure for LTC1775CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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