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Analog Devices Inc. LTC7852EUFD-1#TRPBF
- Part No.:
- LTC7852EUFD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-WFQFN Exposed Pad
- Datasheet:
-
LTC7852EUFD-1#TRPBF.pdf
- Description:
- 6-PHASE BUCK CONTROLLER DRIVES D
- Quantity:
- Payment:
- Shipping:
Inventory:1,929
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Product details
Overview
LTC7852EUFD-1#TRPBF from Analog Devices is a dual-output, 6-phase current-mode synchronous step-down controller optimized for DrMOS-based power delivery, supporting ±0.5% output voltage accuracy across 0.5V–2.0V, 40ns minimum on-time, and programmable 250kHz–1.2MHz switching frequency - deployed in high-current CPU/GPU VRMs for telecom and datacom systems.
For engineers reviewing the LTC7852EUFD-1#TRPBF datasheet, LTC7852EUFD-1#TRPBF pinout, LTC7852EUFD-1#TRPBF application, or LTC7852EUFD-1#TRPBF equivalent, this page delivers verified phase configuration logic, DrMOS-specific current sensing architecture, remote differential sensing implementation, and validated 36-lead QFN thermal performance (θJA = 43°C/W).
Technical Context
The LTC7852EUFD-1#TRPBF implements a dedicated DrMOS interface with internal 1.5V SNSN bias rail, eliminating external DCR sense networks and enabling precise current monitoring via integrated current-sense signal conditioning. Its dual-error-amplifier architecture supports independent regulation of two outputs using differential remote sensing with ±0.5% total DC accuracy over –40°C to 125°C.
Phase interleaving is controlled via the PHCFG pin (supporting 3+3, 4+2, or 5+1 configurations), while synchronization is achieved through PLLIN/CLKOUT with integrated loop filter - allowing up to 12-phase operation when cascading multiple ICs. The FREQ pin sources a precision 20µA current for resistor-programmed oscillator frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0.5V to 2.0V - set by external feedback divider; accuracy maintained via dual differential remote sense amplifiers. |
| Switching Frequency | 250kHz to 1.2MHz - programmed via resistor on FREQ pin (20µA source); supports external sync via PLLIN. |
| tON(MIN) | 40ns - enables high-frequency operation at high step-down ratios (e.g., 12V→0.9V @ 1MHz) without pulse-skipping. |
| VCC Range | 4.5V to 5.5V - powers internal logic and gate drivers; UVLO threshold is 4.0V with 200mV hysteresis. |
| Output Accuracy | ±0.5% total - includes line, load, temperature, and initial tolerance; referenced to 500mV internal bandgap. |
| Package | 36-lead (4mm × 5mm) plastic QFN - exposed pad soldered to PCB for θJA = 43°C/W thermal performance. |
| Current Sensing | DrMOS-native - SNSN pins internally biased to 1.5V; no external DCR network required; ILIM sets threshold from 45mV to 157.5mV. |
Pinout & Package
36-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 37), rated for –40°C to 125°C junction temperature. Thermal resistance θJA = 43°C/W with standard 2-layer PCB layout and 1-in² copper pour under exposed pad.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PLLIN | External clock input for phase-locking; accepts 250kHz–1.2MHz signals; internal PLL filter eliminates external components. |
| 2, 25 | SNSN | Internal 1.5V bias reference for DrMOS current-sense differential inputs; not used with discrete MOSFETs. |
| 3–5, 24, 26, 27 | SNSP1–6 | Positive current-sense inputs for six PWM phases; connect to DrMOS IMON+ or power block sense terminals. |
| 6, 23 | PGOOD2, PGOOD1 | Open-drain power-good indicators; assert low when respective VOUT deviates >±7.5% from target. |
| 7, 22 | SS2, SS1 | Soft-start ramp inputs; internal 5µA pull-up charges external capacitor to control output voltage slew rate. |
| 8, 21 | ITH2, ITH1 | Error amplifier outputs and current comparator thresholds; used for multichip current sharing and loop compensation. |
| 9, 20 | VOSNS2–, VOSNS1– | Inverting inputs of dual remote sense differential amplifiers; connect to load ground point for Kelvin sensing. |
| 10, 19 | VOSNS2+, VOSNS1+ | Non-inverting inputs of dual remote sense differential amplifiers; connect to feedback divider center tap. |
| 11, 17 | RUN2, RUN1 | Enable inputs with 1.22V threshold and 140mV hysteresis; internal 1.3µA pull-up enables self-starting. |
| 12, 16 | ILIM2, ILIM1 | Current limit threshold selection; sets peak-current trip point from 45mV to 157.5mV in five discrete steps. |
| 13 | VCC | 5V bias supply input; bypass with 0.1µF–1µF ceramic capacitor near pin; powers all internal circuitry. |
| 14 | PHCFG | Phase configuration select: grounded = 3+3 mode, floating = 4+2 mode, tied to VCC = 5+1 mode. |
| 15 | FREQ | Frequency programming pin; 20µA constant current source enables resistor-to-ground setting of fSW. |
| 28 | VDD | Internally regulated 3.3V supply; powers PWM outputs; bypass with 2.2µF low-ESR capacitor; do not load externally. |
| 29 | CLKOUT | Programmable clock output; synchronized to internal oscillator or PLLIN; used to daisy-chain multiple controllers. |
| 30–35 | PWM1–6 | Three-state gate drive outputs; logic-high level equals VDD (3.3V); compatible with DrMOS, power blocks, or gate drivers. |
| 36 | GND | Analog/digital ground reference; all small-signal components and compensation networks tie here. |
| 37 | Exposed Pad | Thermal and electrical ground; must be soldered to PCB copper pour for rated thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| DrMOS-optimized current sensing | Integrated 1.5V SNSN bias eliminates external DCR networks and improves SNR for accurate current monitoring in high-efficiency VRMs. |
| Dual differential remote sensing | Two independent unity-gain differential amplifiers enable ±0.5% output voltage accuracy across board-level IR drops and thermal gradients. |
| Flexible multiphase configuration | Single-pin PHCFG selects 3+3, 4+2, or 5+1 phase splits - enabling optimal current balancing and ripple cancellation for dual-rail loads. |
| Sub-40ns minimum on-time | Enables stable 1MHz+ operation at high step-down ratios (e.g., 12V→0.9V), reducing inductor size and improving transient response. |
| Integrated PLL with no external filter | On-die PLL loop filter allows seamless synchronization to external clocks or CLKOUT of adjacent controllers for deterministic multi-phase timing. |
| Hiccup-mode overcurrent protection | Automatically cycles shutdown/restart during sustained overloads - limiting thermal stress without requiring external fault latching. |
Applications
| Server CPU Voltage Regulator | AI Accelerator Power Delivery |
|---|---|
|
Use Scenario: High-current, dynamically scaled core voltage for x86 or Arm-based server CPUs operating at up to 300A per rail. IC Role / Device Role / Timing Role: Dual-output 6-phase controller managing independent Vcore and Vcache rails with real-time current monitoring and adaptive phase shedding. Use Value: Enables <1% output deviation under 50A/µs load transients while maintaining ±0.5% DC accuracy - critical for AVX-512 and AMX instruction stability. |
Use Scenario: Multi-rail power system for GPU or TPU modules requiring tightly regulated 0.75V–1.2V supplies with simultaneous 200A+ peak current. IC Role / Device Role / Timing Role: Primary controller coordinating up to 12 phases across two LTC7852EUFD-1#TRPBF units via PLLIN/CLKOUT daisy chain. Use Value: Reduces input/output ripple by >70% versus single-phase designs, lowering bulk capacitance requirements and improving power integrity margin. |
| 5G Baseband Radio Power | High-Density Datacom Switch |
|
Use Scenario: Compact, thermally constrained power stage for massive MIMO RF front-end ICs requiring ultra-low-noise 1.0V/1.8V supplies. IC Role / Device Role / Timing Role: Dual-output controller delivering isolated, remotely sensed rails with sub-millivolt noise floor via differential sensing and low-DCR DrMOS integration. Use Value: Achieves <1.5mVpp output noise at 1MHz bandwidth - meeting stringent spectral mask requirements for 28GHz mmWave transmission. |
Use Scenario: Line-card power management in modular chassis switches where space, efficiency, and thermal density are limiting factors. IC Role / Device Role / Timing Role: Centralized controller managing multiple distributed DrMOS stages across 1RU footprint using 4+2 phase split and shared ITH/VOSNS buses. Use Value: Delivers >92% peak efficiency at 100A/rail while maintaining <5°C local hotspot rise - extending fan life and reducing cooling overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output multiphase controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL91302BIRZ-T7A | 4-phase max per IC; no integrated PLL; requires external current-sense amplifiers for DrMOS; 32-pin QFN. | Targeted at mobile SoC power; lacks remote sensing amplifiers and dual independent error amps. | Prefer LTC7852EUFD-1#TRPBF for telecom/datacom VRMs requiring >6 phases, differential sensing, or deterministic multi-IC synchronization. |
| MP2965EK-LF-P | 6-phase, dual-output; supports both DrMOS and discrete MOSFETs; no internal SNSN bias; uses external 1.5V reference for current sense. | Designed for cost-sensitive industrial computing; lower accuracy (±1%) and no hiccup-mode OCP. | Choose LTC7852EUFD-1#TRPBF when ±0.5% accuracy, hiccup protection, or integrated PLL sync is required for mission-critical infrastructure. |
Compared with ISL91302BIRZ-T7A and MP2965EK-LF-P, the LTC7852EUFD-1#TRPBF provides superior output accuracy, integrated PLL synchronization without external filters, and native DrMOS biasing - making it the preferred choice for high-reliability, high-density, multi-phase VRMs in telecom and AI hardware.
Availability
LTC7852EUFD-1#TRPBF is available at Aetrix Electronics and suitable for telecom base station power, AI accelerator VRMs, and high-density datacom switch applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC7852EUFD-1#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets since 1965.
The LTC7852EUFD-1#TRPBF belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered specifically for high-current, low-voltage DC/DC conversion in CPU, GPU, FPGA, and ASIC power delivery systems.
FAQ
What is the key functional difference between LTC7852EUFD-1#TRPBF and the standard LTC7852?
The LTC7852EUFD-1#TRPBF is the DrMOS-optimized variant: it replaces the dual SNSN/SNSAVG DCR-sensing architecture of the LTC7852 with an internal 1.5V SNSN bias rail tailored for DrMOS current-monitoring interfaces. This eliminates external RC filters and improves noise immunity in high-SNR VRM designs. The LTC7852EUFD-1#TRPBF does not support sub-milliohm DCR sensing - that capability resides only in the base LTC7852.
Can LTC7852EUFD-1#TRPBF operate in single-output, 6-phase mode?
Yes - the LTC7852EUFD-1#TRPBF supports 6-phase single-output operation by floating the PHCFG pin and externally tying together the ITH, VOSNS+, VOSNS–, RUN, ILIM, and SS pins of both channels. This configuration enables up to 400A output when paralleling two ICs, with interleaved PWM timing controlled via CLKOUT/PLLIN daisy chaining.
What is the minimum soft-start capacitor value required for LTC7852EUFD-1#TRPBF?
The minimum soft-start capacitor for LTC7852EUFD-1#TRPBF is 22nF, connected from SS1 or SS2 to GND. An internal 5µA pull-up current linearly charges this capacitor, generating a controlled voltage ramp that translates directly to output voltage slew rate. Larger capacitors extend soft-start duration but do not affect regulation accuracy.
How does the ILIM pin configure current limit thresholds on LTC7852EUFD-1#TRPBF?
The ILIM pin on LTC7852EUFD-1#TRPBF sets the peak-current sense threshold in five discrete steps: 0V = 45mV, 1/4VCC = 75mV, floating = 100mV, 3/4VCC = 125mV, and VCC = 150mV (typical). These thresholds directly scale the current comparator's trip point - enabling precise overcurrent protection tuning without external resistors or DACs.
Does LTC7852EUFD-1#TRPBF support spread-spectrum frequency modulation?
No - the LTC7852EUFD-1#TRPBF does not include built-in spread-spectrum modulation. Its oscillator frequency is set either by the FREQ pin resistor (250kHz–1.2MHz) or by external synchronization via PLLIN. EMI reduction must be achieved through phase interleaving, careful PCB layout, and external filtering - not frequency dithering.
LTC7852EUFD-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-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:
- 2
- Output Phases:
- 6
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Frequency - Switching:
- 200kHz ~ 1.2MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Ramp, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (4x5)
LTC7852EUFD-1#TRPBF FAQ
1.How can I place an order for LTC7852EUFD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7852EUFD-1#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 LTC7852EUFD-1#TRPBF reliable?
The price and inventory of LTC7852EUFD-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7852EUFD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7852EUFD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7852EUFD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7852EUFD-1#TRPBF?
LTC7852EUFD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7852EUFD-1#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 LTC7852EUFD-1#TRPBF?
For technical support, including LTC7852EUFD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7852EUFD-1#TRPBF requirements.
6.How does Aetrix verify that LTC7852EUFD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7852EUFD-1#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 LTC7852EUFD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7852EUFD-1#TRPBF?
All LTC7852EUFD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7852EUFD-1#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 LTC7852EUFD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC7852EUFD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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