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Analog Devices Inc. LTC3823IUH#TRPBF
- Part No.:
- LTC3823IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3823IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,109
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Product details
Overview
LTC3823IUH#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller with true remote differential output sensing, output voltage tracking, and PLL-based external clock synchronization. It delivers 0.6V to 3.3V outputs (with remote sense) from 4.5V–36V input, supports <100ns minimum on-time, ±0.67% reference accuracy, and operates up to 90% duty cycle at 200kHz-enabling high-efficiency power delivery for server memory and ASIC core rails.
For engineers reviewing the LTC3823IUH#TRPBF datasheet, LTC3823IUH#TRPBF pinout, LTC3823IUH#TRPBF application, or LTC3823IUH#TRPBF equivalent, key selection criteria include its valley current mode control without RSENSE, programmable current limit via VRNG, differential remote sensing architecture, and dual N-channel MOSFET driver capability with <20ns rise/fall times.
Technical Context
The LTC3823IUH#TRPBF implements constant on-time, valley current mode control using an internal one-shot timer whose duration is set by ION current and VON voltage-enabling stable operation across wide VIN ranges without requiring a sense resistor. Its differential remote sensing amplifier (ADA = 0.9965–1.0035 V/V, VOS = 2mV) rejects PCB trace IR drops to maintain ±0.67% regulation at the load.
Phase-locked loop synchronization accepts external clocks via PLLIN (50kΩ input impedance), with PLLFLTR providing low-pass filtering; overvoltage protection triggers immediate top-FET turn-off and bottom-FET latching when VFB exceeds ±11% of 0.6V reference; soft-start is implemented via 1.7μA current charging TRACK/SS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 36V - supports industrial and server input rails including 5V, 12V, 24V, and 28V supplies. |
| Output Voltage | 0.6V to 3.3V (with remote sense); up to 90% of VIN (without remote sense) - enables direct generation of DDR, CPU core, and FPGA I/O voltages. |
| Reference Accuracy | ±0.67% at 0.6V - ensures tight regulation critical for low-voltage, high-current digital loads. |
| tON(MIN) | <100ns - allows ultra-low duty cycle operation needed for high step-down ratios (e.g., 24V→1.2V). |
| Switching Frequency | Adjustable via RON; synchronized via PLLIN - enables EMI reduction and multi-rail coherence in dense power systems. |
| Current Limit Range | 50mV to 320mV (set by VRNG) - provides scalable overcurrent protection from 5A to 60A+ depending on RSENSE or MOSFET RDS(ON). |
| Driver Strength | TG/BG pull-up/down RON ≤2.5Ω; tr/tf ≤20ns (3300pF load) - drives large gate charges for efficient high-frequency switching. |
Pinout & Package
The LTC3823IUH#TRPBF is housed in a 32-lead (5mm × 5mm) plastic QFN package with exposed pad (Pin 33 = SGND), rated for –40°C to +85°C operation and θJA = 34°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (14) | Main input supply rail | Accepts 4.5V–36V; decoupled to PGND with 0.1–1μF capacitor for stability and noise rejection. |
| SW (25) | Switch node | Connects to source of top MOSFET and bootstrap capacitor negative terminal; swings from ~–0.7V to VIN. |
| TG (26) | Top gate driver output | Drives gate of high-side N-MOSFET with INTVCC-referenced swing superimposed on SW node voltage. |
| BG (21) | Bottom gate driver output | Drives gate of low-side N-MOSFET between PGND and INTVCC; supports synchronous rectification. |
| SENSE+ (24) / SENSE– (23) | Current sense comparator inputs | Support Kelvin sensing across RSENSE or bottom MOSFET; enable no-RSENSE operation when SENSE+ tied to SW. |
| VOUTSENSE+ (8) / VOUTSENSE– (9) | Differential remote sense inputs | Connect directly to load terminals; feed into precision differential amplifier (ADA = 1.000±0.0035) for true load regulation. |
| TRACK/SS (11) | Tracking & soft-start control | Internal 1.7μA current charges external capacitor for controlled ramp-up; accepts master VFB for coordinated multi-rail sequencing. |
| PLLIN (13) | External clock input | 50kΩ-terminated input accepting TTL/CMOS clock; enables deterministic frequency alignment with system timing sources. |
| PGOOD (32) | Open-drain power-good monitor | Pulls low if VFB deviates >±11% after 20μs mask timer; tracks reference input with hysteresis for reliable rail validation. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE operation | Uses bottom MOSFET RDS(ON) as current sense element-eliminates sense resistor losses and board space while maintaining accurate valley current control. |
| Differential remote sensing | True Kelvin feedback via VOUTSENSE+/– with 2mV offset and 90dB PSRR-rejects PCB trace resistance to hold ±0.67% regulation at point-of-load. |
| Programmable current limit | VRNG pin sets nominal sense threshold from 50mV to 200mV (10× scaling), enabling precise overcurrent protection tailored to specific MOSFET or RSENSE selection. |
| Constant on-time valley current mode | Delivers inherent line regulation and fast transient response without compensation network-simplifies design for varying input conditions. |
| PLL synchronization | Locks switching frequency to external clock (e.g., system master oscillator), eliminating beat frequencies and enabling deterministic EMI management. |
Applications
| Server Memory Power Rails | ASIC Core Voltage Regulation |
|---|---|
Use Scenario: Delivering tightly regulated 1.2V/1.5V/1.8V to DDR4/LPDDR4 memory modules in rack-mounted servers with strict ripple and transient requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current (20A–60A) point-of-load conversion with remote sense feedback at DIMM edge connectors. Use Value: Differential sensing maintains ±0.67% output accuracy despite 50mΩ PCB trace resistance; <100ns tON(MIN) supports 24V→1.2V conversion at 500kHz. | Use Scenario: Generating dynamically scaled core voltages (0.7V–1.2V) for high-performance ASICs in telecom baseband and AI accelerator cards. IC Role / Device Role / Timing Role: Fast-transient, valley-current-mode controller with TRACK/SS pin enabling precise voltage sequencing relative to I/O or auxiliary rails. Use Value: Programmable soft-start and output tracking ensure safe power-up of multi-domain ASICs; ±0.67% reference enables margining within 10mV tolerance windows. |
| Industrial PLC CPU Supplies | High-Density Telecom Power Modules |
Use Scenario: Providing robust 3.3V/5V logic rails in programmable logic controllers operating across –40°C to +85°C ambient with wide input variation (12V–36V). IC Role / Device Role / Timing Role: Wide-VIN synchronous controller with UVLO (3.4V/4.1V thresholds), OVP, and thermal shutdown protecting against brownouts and overloads. Use Value: Micropower shutdown (30μA) extends battery backup time; 36V max VIN accommodates unregulated 24V industrial bus transients. | Use Scenario: Building compact, high-efficiency 12V→3.3V/1.8V intermediate bus converters in 1RU telecom equipment with strict EMI limits. IC Role / Device Role / Timing Role: PLL-synchronized buck controller enabling deterministic switching frequency alignment across multiple rails to suppress beat frequencies. Use Value: External clock sync eliminates variable-frequency jitter; QFN-32 package (5mm × 5mm) supports >8A/in² power density with exposed pad thermal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855IUFD#TRPBF | Higher integration: includes 5V LDO for gate drive, integrated bootstrap diode, and enhanced current mode with slope compensation. | Designed for lower-component-count designs where gate-drive self-sufficiency and simplified layout are priorities over ultimate efficiency at light load. | Select LTC3855IUFD#TRPBF when reducing external components (e.g., eliminating DB, CB, DRVCC routing) outweighs need for minimal quiescent current or maximum light-load efficiency. |
| MP2918GL-Z | Fixed 600kHz frequency, no PLL sync; lacks differential remote sensing; uses single-ended VOUT sense only. | Targeted at cost-sensitive, medium-performance applications where ±1% regulation and basic sequencing suffice. | Select MP2918GL-Z only for non-critical 3.3V/5V rails where remote sensing, sub-100ns tON, or PLL synchronization are unnecessary. |
Compared with LTC3855IUFD#TRPBF and MP2918GL-Z, the LTC3823IUH#TRPBF offers superior precision (±0.67% vs ±1%), true differential remote sensing (vs single-ended), and PLL synchronization (vs fixed or free-running), making it optimal for high-accuracy, multi-rail, EMI-constrained server and ASIC power systems.
Availability
LTC3823IUH#TRPBF is available at Aetrix Electronics and suitable for server memory power rails, ASIC core voltage regulation, and industrial PLC CPU supplies requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to +85°C operation.
Supply support for LTC3823IUH#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 product continuity, technical documentation, and manufacturing for all Linear power ICs including the LTC3823 series.
The LTC3823 belongs to Linear's high-performance synchronous buck controller family, designed specifically for demanding digital power applications requiring precision regulation, remote sensing, and multi-rail coordination in servers, networking, and test equipment.
FAQ
What is the minimum on-time specification for the LTC3823IUH#TRPBF?
The LTC3823IUH#TRPBF has a guaranteed minimum on-time of 50ns (typical 100ns) under worst-case conditions (ION = –180μA, VON = 0V). This enables stable operation at very low duty cycles-for example, stepping down 24V to 1.2V at 500kHz-without pulse-skipping or instability, a key advantage over controllers with >200ns tON(MIN).
Does the LTC3823IUH#TRPBF require an external sense resistor?
No-the LTC3823IUH#TRPBF supports true No RSENSE operation by using the bottom N-MOSFET's RDS(ON) as the current sensing element. Connect SENSE+ to the SW node and SENSE– to PGND. The controller automatically scales current limit thresholds based on VRNG voltage, preserving accuracy without added loss or cost.
How does the differential remote sensing work on the LTC3823IUH#TRPBF?
The LTC3823IUH#TRPBF uses dedicated VOUTSENSE+ and VOUTSENSE– pins feeding a precision differential amplifier (gain = 1.000±0.0035, offset = 2mV) that drives the error amplifier. This architecture rejects voltage drop across PCB traces between the converter and load, ensuring the 0.6V reference is enforced *at the load terminals*, not at the regulator output.
Can the LTC3823IUH#TRPBF be synchronized to an external clock?
Yes-the LTC3823IUH#TRPBF includes a dedicated PLLIN pin with 50kΩ internal termination and phase detector circuitry. When an external clock is applied, the internal PLL locks the switching frequency to match it, enabling deterministic EMI suppression and multi-rail coherence-critical in dense, noise-sensitive systems like 5G base stations and high-speed data centers.
What is the purpose of the VRNG pin on the LTC3823IUH#TRPBF?
The VRNG pin on the LTC3823IUH#TRPBF sets the nominal current sense threshold voltage: 0.133 × VRNG. By applying 0.5V–2V (e.g., via resistive divider from INTVCC), users scale the current limit from 50mV to 200mV-allowing precise tailoring of overcurrent protection for different RSENSE values or MOSFET RDS(ON), without changing external components.
LTC3823IUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 36V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, On Time Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3823IUH#TRPBF FAQ
1.How can I place an order for LTC3823IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3823IUH#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 LTC3823IUH#TRPBF reliable?
The price and inventory of LTC3823IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3823IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3823IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3823IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3823IUH#TRPBF?
LTC3823IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3823IUH#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 LTC3823IUH#TRPBF?
For technical support, including LTC3823IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3823IUH#TRPBF requirements.
6.How does Aetrix verify that LTC3823IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3823IUH#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 LTC3823IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3823IUH#TRPBF?
All LTC3823IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3823IUH#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 LTC3823IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3823IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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