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Analog Devices Inc. LTC3774IUHE#TRPBF
- Part No.:
- LTC3774IUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-WFQFN Exposed Pad
- Datasheet:
-
LTC3774IUHE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,362
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Product details
Overview
LTC3774IUHE#TRPBF from Analog Devices is a dual-phase, polyphase current-mode synchronous step-down controller optimized for sub-milliohm DCR sensing with 0.6V to 3.5V output regulation, 4.5V–38V input range, and programmable 200kHz–1.2MHz switching frequency. It drives external MOSFETs or power blocks in high-current DC/DC converters for telecom and industrial systems.
For engineers reviewing the LTC3774IUHE#TRPBF datasheet, LTC3774IUHE#TRPBF pinout, LTC3774IUHE#TRPBF application, or LTC3774IUHE#TRPBF equivalent, key selection criteria include ±0.75% total DC output error over temperature, dual differential remote sense amplifiers, phase-lockable operation, programmable DCR temperature compensation, and support for up to 12-phase paralleling.
Technical Context
The LTC3774IUHE#TRPBF implements a proprietary dual-channel current-mode architecture with separate AC/DC current sense paths (SNSA+/SNSD+) to enhance SNR for ultra-low-DCR inductors (down to 0.2mΩ). Each channel features independent ITH-based peak current control, soft recovery from overcurrent, and hiccup-mode protection.
It integrates a precision 0.6V reference, dual remote-sense differential amplifiers, internal 5.5V INTVCC regulator, and PLL-synchronizable oscillator. Phase relationships between CH1, CH2, and CLKOUT are controlled via PHSMD voltage levels (GND, INTVCC, or fractional INTVCC), enabling 3-, 4-, 6-, 8-, or 12-phase configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 38V - supports wide-input industrial and telecom rails without pre-regulation |
| VOUT Range | 0.6V to 3.5V - enables core voltage regulation for modern processors and ASICs |
| Max Output Error | ±0.75% over –40°C to 125°C - ensures stable load regulation across full operating range |
| Switching Frequency | 200kHz to 1.2MHz - selectable via FREQ pin resistor; balances efficiency vs. component size |
| Current Sense Threshold | Programmable 10mV–30mV in 5mV steps via ILIM pins - enables accurate current limiting with low-DCR inductors |
| DCR Temp Compensation | Supported via ITEMP pins with NTC thermistor - maintains current-sense accuracy under thermal drift |
| Operating Temp | –40°C to 125°C junction - qualified for harsh industrial and automotive under-hood environments |
Pinout & Package
Package: 36-lead (5mm × 6mm) plastic QFN with exposed thermal pad (Pin 37 = GND). Requires soldering of exposed pad for thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 35) | Main input supply | Accepts 4.5V–38V; decoupled with 0.1µF–1µF ceramic capacitor |
| INTVCC (Pin 34) | Internal 5.5V regulator output | Powers control circuitry; requires ≥4.7µF low-ESR capacitor to GND |
| PGOOD1,2 (Pins 15,14) | Open-drain power-good indicators | Pull low when VOSNS+ deviates >±7.5% from setpoint; enable sequencing |
| SNSA1+, SNSA2+ (Pins 16,13) | AC current sense comparator inputs | High-bandwidth path (5× L/DCR) for noise-rejecting DCR sensing |
| SNSD1+, SNSD2+ (Pins 18,11) | DC current sense comparator inputs | Matched L/DCR filter bandwidth for accurate average current measurement |
| ITH1, ITH2 (Pins 27,2) | Error amplifier output / current threshold | Controls peak inductor current; sets loop gain and transient response |
| FREQ (Pin 31) | Frequency programming node | Sources 20µA; resistor to GND sets switching frequency from 200kHz–1.2MHz |
| MODE/PLLIN (Pin 32) | Mode select / external clock input | GND = forced continuous; INTVCC = pulse-skipping; float = Burst Mode; driven = PLL sync |
| PHSMD (Pin 30) | Phase mode control | Voltage level selects CH1–CH2 and CH1–CLKOUT phase offsets (e.g., 180° or 120°) |
| TK/SS1,2 (Pins 24,5) | Soft-start / tracking inputs | 1.25µA pull-up charges external capacitor; controls output ramp rate or enables supply tracking |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase polyphase control | Enables interleaved operation for reduced input/output ripple and higher effective switching frequency |
| Sub-milliohm DCR sensing | Supports inductors as low as 0.2mΩ DCR with 14dB SNR improvement - maximizes efficiency and minimizes jitter |
| Programmable current limit | 10mV–30mV threshold in 5mV steps via ILIM pins - precise overcurrent protection without sense resistors |
| Dual differential remote sensing | Independent VOSNS1±/VOSNS2± inputs - eliminates PCB trace IR drop errors for tight output regulation |
| Phase shedding & redundancy | HIZB1/HIZB2 pins disable individual phases - supports N+1 fault tolerance and dynamic load scaling |
| Three light-load modes | Burst Mode (highest efficiency), pulse-skipping (low ripple), or forced continuous (lowest noise) - selectable per application need |
Applications
| Computer Systems | Telecom and Datacom Systems |
|---|---|
Use Scenario: High-current CPU/GPU core voltage regulation in servers and workstations. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing up to 60A per phase with precise DCR current sensing. Use Value: Enables use of ultra-low-DCR inductors to reduce conduction loss and thermal stress while maintaining ±0.75% output accuracy. |
Use Scenario: Point-of-load conversion for 48V intermediate bus systems in base stations and routers. IC Role / Device Role / Timing Role: Primary controller for 12V or 5V intermediate distribution with phase synchronization across multiple boards. Use Value: Supports daisy-chained multiphase operation up to 12 phases, reducing input capacitance requirements and EMI emissions. |
| Industrial Equipment | DC Power Distribution Systems |
Use Scenario: Motor drive auxiliary power supply requiring robust operation across wide ambient temperatures. IC Role / Device Role / Timing Role: Dual-channel controller delivering isolated 3.3V/5V rails with hiccup-mode overcurrent protection. Use Value: –40°C to 125°C operating range and programmable DCR temperature compensation ensure stable performance in uncontrolled enclosures. |
Use Scenario: Redundant 24V/48V DC distribution in data centers with N+1 phase backup. IC Role / Device Role / Timing Role: Master/slave synchronized controller enabling seamless phase shedding during partial failure. Use Value: HIZB-controlled phase disable and PHSMD-configurable phase offsets allow graceful degradation without output disturbance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3874IUFD#TRPBF | Single-channel version in 28-lead QFN; lacks second phase, CLKOUT, and PHSMD functionality | Suitable only for single-phase designs; cannot support multiphase paralleling or phase synchronization | Select when system current demand is ≤30A and no phase coordination is required |
| MP2960AGU-Z | Monolithic dual-phase controller with integrated MOSFET drivers; fixed 0.6V reference; no DCR temp compensation | Higher integration reduces external component count but limits flexibility in gate drive and sensing topology | Select for cost-sensitive, space-constrained designs where discrete power stage control is not needed |
Compared with LTC3774IUHE#TRPBF, LTC3874IUFD#TRPBF offers half the channel count and no multiphase capability, while MP2960AGU-Z trades external power stage flexibility for monolithic integration and simplified layout - choice depends on whether phase scalability or driver integration is prioritized.
Availability
LTC3774IUHE#TRPBF is available at Aetrix Electronics and suitable for computer systems, telecom infrastructure, and industrial equipment requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 125°C.
Supply support for LTC3774IUHE#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and computing markets.
The LTC3774IUHE#TRPBF belongs to Linear's PolyPhase® controller family, designed specifically for high-efficiency, high-current DC/DC conversion using low-DCR inductor sensing in demanding telecom and server applications.
FAQ
What is the maximum supported switching frequency for the LTC3774IUHE#TRPBF?
The LTC3774IUHE#TRPBF supports a linearly programmable switching frequency from 200kHz to 1.2MHz via the FREQ pin. A precision 20µA current source flows out of this pin, allowing frequency setting with a single resistor to ground. The maximum frequency of 1.2MHz is confirmed in the Electrical Characteristics table under fOSC Max Frequency (LTC3774 datasheet Rev. C, p.4).
Does the LTC3774IUHE#TRPBF support remote voltage sensing?
Yes, the LTC3774IUHE#TRPBF supports dual independent remote voltage sensing via VOSNS1± and VOSNS2± pins. These differential inputs connect directly to the load terminals to compensate for PCB trace resistance, ensuring ±0.75% total DC output error over temperature. This capability is explicitly stated in the FEATURES section and verified in the PIN FUNCTIONS description (p.8).
Can the LTC3774IUHE#TRPBF operate with inductors having DCR below 1mΩ?
Yes, the LTC3774IUHE#TRPBF is specifically engineered for sub-milliohm DCR sensing, supporting inductors down to 0.2mΩ with its dual-path (SNSA+/SNSD+) architecture and 14dB SNR enhancement. This is documented in the DESCRIPTION and OPERATION sections (pp.1,10), and confirmed by typical performance curves showing stable operation at 0.32mΩ DCR (TA01a schematic, p.2).
How does the LTC3774IUHE#TRPBF handle overcurrent conditions?
The LTC3774IUHE#TRPBF provides hiccup-mode/soft recovery from output overcurrent: upon current limit trip, it disables switching, waits for fault clearance, then restarts with soft-start to minimize output overshoot. This behavior is specified under FEATURES ("Hiccup Mode/Soft Recovery") and detailed in the OPERATION section (p.10), distinguishing it from hard latch-off or immediate retry schemes.
Is the LTC3774IUHE#TRPBF pin-compatible with other members of the LTC377x family?
No, the LTC3774IUHE#TRPBF is not pin-compatible with other LTC377x variants such as LTC3775 or LTC3776. It uses a unique 36-lead QFN package with dedicated pins for dual-phase control (e.g., dual RUN, PWMEN, HIZB, TK/SS), whereas LTC3775 is a single-phase controller in 28-lead QFN. Pin compatibility is neither claimed nor implied in the datasheet or order information tables.
LTC3774IUHE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 36-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- PWM Signal
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 150kHz ~ 1.2MHz
- Duty Cycle (Max):
- 98%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LTC3774IUHE#TRPBF FAQ
1.How can I place an order for LTC3774IUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3774IUHE#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 LTC3774IUHE#TRPBF reliable?
The price and inventory of LTC3774IUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3774IUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3774IUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3774IUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3774IUHE#TRPBF?
LTC3774IUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3774IUHE#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 LTC3774IUHE#TRPBF?
For technical support, including LTC3774IUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3774IUHE#TRPBF requirements.
6.How does Aetrix verify that LTC3774IUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3774IUHE#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 LTC3774IUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3774IUHE#TRPBF?
All LTC3774IUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3774IUHE#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 LTC3774IUHE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3774IUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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