My Inquiry
My Account
Analog Devices Inc. LTC3823EUH#TRPBF
- Part No.:
- LTC3823EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3823EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,677
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3823EUH#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 - ideal for high-accuracy server and ASIC power rails.
For engineers reviewing the LTC3823EUH#TRPBF datasheet, LTC3823EUH#TRPBF pinout, LTC3823EUH#TRPBF application, or LTC3823EUH#TRPBF equivalent, key selection criteria include its No RSENSE valley current mode architecture, programmable current limit via VRNG/ITH, differential remote sensing capability, and dual N-channel MOSFET driver performance under wide VIN and thermal constraints.
Technical Context
The LTC3823EUH#TRPBF implements constant on-time, valley current mode control without requiring a sense resistor - enabling ultra-low duty cycles down to <100ns. Its internal phase-locked loop allows precise synchronization to an external clock while maintaining stable regulation across input and load transients.
True remote differential sensing uses dedicated VOUTSENSE+/VOUTSENSE– inputs feeding a 0.9965–1.0035 gain amplifier (±2mV offset), and output tracking is implemented via the TRACK/SS pin with internal 1.7μA soft-start current. Fault protection includes overvoltage detection (±11% PGOOD window), undervoltage lockout (3.4V rising), and adjustable cycle-by-cycle current limiting.
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 bus systems. |
| Output Voltage | 0.6V to 3.3V with remote sense - enables tight regulation of low-voltage ASIC/memory supplies. |
| Reference Accuracy | ±0.67% at 0.6V - ensures sub-10mV error at 1.5V output, critical for high-performance digital loads. |
| tON(MIN) | <100ns - allows stable operation at very low duty cycles (e.g., 1.2V out from 36V in). |
| Switching Frequency | Adjustable via RON; synchronized via PLLIN - enables EMI control and multi-rail coherence. |
| Current Limit | Programmable 50mV–240mV sense threshold via VRNG - supports flexible MOSFET RDS(ON)-based or discrete sense resistor designs. |
| Thermal Performance | θJA = 34°C/W (QFN UH package) - enables high-power density layouts with exposed pad soldered to SGND. |
Pinout & Package
The LTC3823EUH#TRPBF is housed in a 32-lead (5mm × 5mm) plastic QFN package with exposed thermal pad (Pin 33 = SGND). The package supports high-current gate drive and low-impedance signal return paths essential for synchronous buck stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (14) | Main input supply input | Accepts 4.5V–36V; requires local 0.1–1μF ceramic decoupling to PGND. |
| TG (26) | Top N-MOSFET gate driver output | Drives high-side switch with INTVCC-referenced swing; 1.9Ω pull-up / 1.2Ω pull-down typical. |
| BG (21) | Bottom N-MOSFET gate driver output | Drives synchronous rectifier; 1.9Ω pull-up / 0.7Ω pull-down typical; fast 20ns rise/fall. |
| SENSE+ (24) / SENSE– (23) | Valley current sense inputs | Support Kelvin sensing across MOSFET RDS(ON) or external resistor; no RSENSE option enabled. |
| VOUTSENSE+ (8) / VOUTSENSE– (9) | Differential remote output sense inputs | Feed dedicated 1V/V amplifier with 80kΩ input resistance and 90dB PSRR - rejects PCB IR drop. |
| TRACK/SS (11) | Tracking & soft-start control | Internal 1.7μA current charges external capacitor; enables coordinated power-up with master/slave rails. |
| PLLIN (13) | External clock synchronization input | 50kΩ internal termination to SGND; accepts TTL/CMOS clocks for deterministic switching timing. |
| PGOOD (32) | Open-drain power-good monitor | Asserts low when VFB deviates >±11% from 0.6V reference after 20μs mask timer - signals system enable. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE valley current mode | Eliminates sense resistor losses and board space; uses MOSFET RDS(ON) for current sensing with programmable threshold. |
| Differential remote sensing | 0.9965–1.0035 gain amplifier rejects up to 100mV of PCB trace IR drop - maintains ±0.67% regulation at load point. |
| Output voltage tracking | TRACK/SS pin accepts master rail voltage or soft-start ramp - enables sequenced startup of multi-rail systems (e.g., core + I/O). |
| PLL synchronization | Enables deterministic switching alignment across multiple converters - reduces beat frequencies and EMI peaks. |
| Adjustable current foldback | Reduces valley current limit to 10% during short-circuit - limits power dissipation without latch-off. |
Applications
| Server CPU Core Rail | ASIC Memory Interface Supply |
|---|---|
Use Scenario: Powers 1.2V/10A CPU core from 12V intermediate bus with strict ±15mV regulation and sequencing relative to I/O rail. IC Role / Device Role / Timing Role: Primary synchronous buck controller with remote sense, TRACK/SS-linked to I/O rail, and PLL-synchronized to system clock. Use Value: Maintains 0.6V reference accuracy (±0.67%) and compensates for 80mV PCB drop - ensures stable operation under dynamic load steps. | Use Scenario: Supplies 1.8V DDR memory subsystem requiring tight transient response and coordinated startup with controller rail. IC Role / Device Role / Timing Role: Slave controller tracking master CPU rail via resistive divider to TRACK/SS; uses differential sensing across bulk capacitors. Use Value: Achieves <200ns tON(MIN) and 90% efficiency at 10A - meets JEDEC DDR4 voltage tolerance and timing margins. |
| Industrial FPGA Power Management | High-Density Telecom Board Supply |
Use Scenario: Generates 0.85V/8A core voltage for Xilinx Kintex Ultrascale+ FPGA with thermal derating and brown-out immunity. IC Role / Device Role / Timing Role: Constant-on-time controller with UVLO (3.4V rising), PGOOD monitoring, and VRNG-set current limit for MOSFET RDS(ON) sensing. Use Value: Delivers 92% peak efficiency at full load and sustains regulation down to 4.5V input - supports wide-input telecom rectified supplies. | Use Scenario: Provides 3.3V/6A auxiliary rail in space-constrained 1RU switch chassis with EMI-sensitive SerDes lanes. IC Role / Device Role / Timing Role: PLL-synchronized buck controller operating at 500kHz to avoid 2.5G/5G SerDes harmonics; uses QFN thermal pad for conduction cooling. Use Value: θJA = 34°C/W enables 6A continuous operation without forced air - meets NEBS GR-63-CORE thermal requirements. |
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#PBF | Higher integration: integrated 5V LDO for gate drive, dual-phase support, and PMBus interface; no PLL sync. | Targeted at multi-phase CPU/GPU rails with digital telemetry; lacks differential remote sensing. | Select LTC3855 for digital power systems requiring telemetry and phase interleaving; LTC3823EUH#TRPBF preferred for analog-controlled, single-phase, remote-sense-critical rails. |
| MP2918GL-Z | Fixed 600kHz frequency; no remote sense; lower accuracy (±1.0% ref); no PLL sync or tracking. | Suitable for cost-sensitive, non-critical 1.0–3.3V rails where layout simplicity outweighs precision. | Choose MP2918 for entry-level telecom or networking boards where ±1% regulation suffices and BOM cost is prioritized over sensing fidelity. |
Compared with LTC3855IUFD#PBF and MP2918GL-Z, the LTC3823EUH#TRPBF uniquely combines differential remote sensing, output tracking, and PLL synchronization in a compact QFN - making it optimal for high-accuracy, multi-rail, noise-sensitive server and ASIC power delivery where analog control integrity is mandatory.
Availability
LTC3823EUH#TRPBF is available at Aetrix Electronics and suitable for server power supplies, ASIC core rails, and FPGA auxiliary supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for LTC3823EUH#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 legacy Linear power ICs.
The LTC3823EUH#TRPBF belongs to Linear's high-performance No RSENSE synchronous controller family, designed specifically for high-efficiency, low-noise, multi-rail power systems in datacenter, networking, and high-end computing applications.
FAQ
What is the minimum on-time specification for LTC3823EUH#TRPBF and why does it matter?
The LTC3823EUH#TRPBF has a guaranteed minimum on-time of <100ns. This enables stable regulation at very low duty cycles - for example, generating 1.2V from a 36V input (3.3% duty cycle) without pulse-skipping or instability. The short tON(MIN) is achieved through its valley current mode architecture and fast comparator design, making LTC3823EUH#TRPBF suitable for wide-input industrial and telecom power systems where input voltage varies significantly.
How does the differential remote sensing work on LTC3823EUH#TRPBF, and what is its practical accuracy benefit?
The LTC3823EUH#TRPBF uses dedicated VOUTSENSE+ and VOUTSENSE– pins feeding a precision differential amplifier with 0.9965–1.0035 gain and ±2mV offset. This rejects voltage drop across PCB traces and connectors between the converter and load. In practice, it maintains ±0.67% output regulation at the load point even with up to 100mV of IR drop - a critical advantage for high-current ASIC and CPU core rails where point-of-load accuracy directly impacts timing margins and reliability.
Can LTC3823EUH#TRPBF operate without an external current sense resistor?
Yes, LTC3823EUH#TRPBF supports true No RSENSE operation by using the bottom MOSFET's RDS(ON) as the current sense element. Connect SENSE+ to the SW node and SENSE– to PGND. The VRNG pin sets the effective sense threshold (50mV–200mV nominal), and the controller adjusts valley current accordingly. This eliminates sense resistor losses and improves efficiency - especially valuable in high-current, thermally constrained applications like server VRMs.
What is the role of the TRACK/SS pin on LTC3823EUH#TRPBF, and how is it used in multi-rail systems?
The TRACK/SS pin on LTC3823EUH#TRPBF serves dual functions: soft-start ramp generation (via internal 1.7μA current charging an external capacitor) and output voltage tracking (when fed with a scaled version of a master rail's feedback). In multi-rail systems - such as CPU core + I/O voltage sequencing - LTC3823EUH#TRPBF can be configured as a slave to track the master rail's startup profile, ensuring controlled turn-on order and preventing reverse bias or latch-up conditions in downstream logic.
Does LTC3823EUH#TRPBF support external clock synchronization, and how is it implemented?
Yes, LTC3823EUH#TRPBF includes a dedicated PLLIN pin for external clock synchronization. An external TTL/CMOS clock applied to PLLIN (internally terminated to SGND with 50kΩ) locks the internal phase-locked loop, aligning switching edges across multiple LTC3823EUH#TRPBF controllers. This eliminates random beat frequencies, reduces EMI peaks, and enables deterministic timing in dense multi-converter systems - essential for high-speed SerDes and RF subsystems where spectral purity is critical.
LTC3823EUH#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)
LTC3823EUH#TRPBF FAQ
1.How can I place an order for LTC3823EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3823EUH#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 LTC3823EUH#TRPBF reliable?
The price and inventory of LTC3823EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3823EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3823EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3823EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3823EUH#TRPBF?
LTC3823EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3823EUH#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 LTC3823EUH#TRPBF?
For technical support, including LTC3823EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3823EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3823EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3823EUH#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 LTC3823EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3823EUH#TRPBF?
All LTC3823EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3823EUH#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 LTC3823EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3823EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3823EUH#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…
