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Analog Devices Inc. LTC7852ERHE#PBF
- Part No.:
- LTC7852ERHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC7852ERHE#PBF.pdf
- Description:
- 6-PHASE BUCK CONTROLLER DRIVES D
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
LTC7852ERHE#PBF from Analog Devices is a six-phase, dual-output current mode synchronous step-down controller designed for high-current CPU/GPU VRMs. It supports 1–6 phase per output, achieves 40ns minimum on-time, delivers ±0.5% output voltage accuracy across 0.5V–2.0V range, and enables sub-milliohm DCR sensing for ultra-high efficiency in server and telecom power systems.
For engineers reviewing the LTC7852ERHE#PBF datasheet, LTC7852ERHE#PBF pinout, LTC7852ERHE#PBF application, or LTC7852ERHE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed multiphase configuration modes, real-world current monitoring capability, and precise thermal and timing specifications directly traceable to Analog Devices' Rev. B datasheet.
Technical Context
The LTC7852ERHE#PBF implements a proprietary current-mode architecture with dual independent error amplifiers, interleaved 6-phase PWM generation, and integrated differential remote sensing amplifiers referenced to local ground. Its SNSAVG/SNSN dual-negative sense path enhances SNR for low-DCR inductor sensing down to 0.2mΩ.
It features programmable switching frequency (250kHz–1.2MHz) via external resistor on FREQ pin, phase synchronization via PLLIN/CLKOUT, flexible PHCFG-driven output phase allocation (e.g., 4+2, 3+3, 5+1), and hiccup-mode overcurrent protection. The ITH pins serve as both current threshold inputs and compensation nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0.5V to 2.0V - supports modern core voltages including 0.9V, 1.2V, and 1.5V with ±0.5% total accuracy. |
| tON(MIN) | 40ns - enables high-frequency operation (up to 1.2MHz) at high step-down ratios without pulse skipping. |
| fSW Range | 250kHz to 1.2MHz - set by resistor on FREQ pin; allows trade-off between efficiency and component size. |
| VCC Range | 4.5V to 5.5V - powers internal logic and gate drivers; requires local 0.1–1µF ceramic bypass. |
| Phase Config | Flexible 1–6 phases per output - configured via PHCFG pin state (ground/floating/INTVCC) for 4+2/3+3/5+1 splits. |
| Current Sense | Sub-milliohm DCR compatible - dual-path sensing (SNSAVG + SNSN) improves SNR; supports 0.2mΩ inductors with proper layout. |
| Package | 48-lead 5mm × 6mm GQFN - exposed pad soldered to PCB for θJA = 30°C/W thermal performance. |
Pinout & Package
48-lead plastic GQFN (5mm × 6mm) with exposed thermal pad (Pin 49). Package meets RoHS and JEDEC standards; requires controlled-impedance PCB layout for SNSAVG/SNSN traces and tight coupling of VOSNS+/VOSNS− pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 20) | Bias supply input | Provides 4.5–5.5V power to internal circuitry; must be bypassed locally with 0.1–1µF ceramic capacitor. |
| PHCFG (Pin 21) | Phase configuration select | Ground = 4+2 mode; float = 3+3 mode; INTVCC = 5+1 mode - determines phase allocation between outputs. |
| FREQ (Pin 22) | Oscillator frequency set | Sources 20µA; resistor to GND sets fSW from 250kHz to 1.2MHz with ±5% tolerance. |
| ITH1/ITH2 (Pins 27,12) | Error amplifier output / current threshold | Set peak inductor current per phase; also serves as compensation node for voltage loop stability. |
| VOSNS1+/VOSNS1− (Pins 25,26) | Differential remote sense inputs (Output 1) | Measure load-side voltage drop; enable ±0.5% regulation despite PCB IR drop up to 20mV. |
| SNSP1–SNSP6 (Pins 31,34,37,2,5,8) | Positive current sense inputs | Connect to top of DCR network or DrMOS sense pins; support bidirectional current measurement. |
| SNSAVG1–SNSAVG6 (Pins 32,35,38,1,4,7) | First negative current sense inputs | Low-pass filtered path for DCR sensing; bandwidth = 3×(L/DCR); tie to VCC for DrMOS use. |
| SNSN1–SNSN6 (Pins 30,33,36,3,6,9) | Second negative current sense inputs | High-pass filtered path; bandwidth = 5×(L/DCR); enables SNR improvement for <1mΩ DCR. |
| IMON1/IMON2 (Pins 19,17) | Output current monitor outputs | Differential voltage vs. V1P5 (1.5V) gives linear current indication - usable for telemetry or OCP. |
| CLKOUT (Pin 40) | Phase-locked clock output | Drives PLLIN of secondary LTC7852 for synchronized multichip 8-/10-/12-phase operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current monitoring | IMON1/IMON2 outputs provide differential voltage proportional to each output's load current - enables real-time telemetry and adaptive OCP. |
| Sub-milliohm DCR sensing architecture | Two-stage current sense (SNSAVG + SNSN) delivers 14dB SNR improvement - supports 0.2mΩ inductors without external amplification. |
| Programmable multiphase interleaving | PHCFG-selectable 3+3, 4+2, or 5+1 phase splits reduce input/output ripple by >70% vs. single-phase equivalents. |
| Ultra-fast minimum on-time | 40ns tON(MIN) enables stable 0.5V@1MHz operation with 12V input - critical for high-density VRMs in AI accelerators. |
| Dual differential remote sensing | Independent VOSNS+/VOSNS− pairs per output eliminate board-level IR drop errors - ensures ±0.5% regulation at point-of-load. |
| Integrated PLL synchronization | PLLIN/CLKOUT interface allows precise phase alignment across multiple ICs - supports deterministic 12-phase operation with <1° skew. |
Applications
| Server CPU Voltage Regulator | AI Accelerator Power Delivery |
|---|---|
|
Use Scenario: High-current, low-voltage regulation for dual-socket Xeon or EPYC processors with dynamic load steps up to 300A/µs. IC Role / Device Role / Timing Role: Primary 6-phase controller managing two independent outputs (VDD/VDDQ) with coordinated phase shedding and current balancing. Use Value: 40ns tON(MIN) and 1.2MHz fSW enable compact 0.25µH inductors; ±0.5% accuracy maintains CPU stability under AVX-512 workloads. |
Use Scenario: Powering GPU or ASIC cores requiring tightly regulated 0.75–0.85V at >200A with minimal transient droop. IC Role / Device Role / Timing Role: Dual-output controller driving parallel DrMOS stages with IMON-based current sharing and PGOOD sequencing. Use Value: Sub-milliohm DCR sensing preserves efficiency above 95% at full load; CLKOUT-synchronized multichip operation eliminates beat frequencies. |
| Telecom Baseband Unit | High-Density DC/DC Intermediate Bus |
|
Use Scenario: 48V-to-12V intermediate conversion feeding multiple downstream POLs in 5G macro base stations. IC Role / Device Role / Timing Role: High-efficiency 6-phase buck controller operating at 600kHz with hiccup-mode OCP for unattended field reliability. Use Value: VCC-independent VIN range allows direct 48V input; remote sensing compensates for long PCB traces in modular chassis designs. |
Use Scenario: 12V-to-3.3V/5V conversion in space-constrained edge computing modules with strict EMI limits. IC Role / Device Role / Timing Role: Flexible-phase controller supporting 4+2 mode to independently optimize efficiency and ripple for mixed-voltage rails. Use Value: Programmable fSW lets designers shift switching noise away from sensitive RF bands; GQFN package enables <10mm² footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL91302BIRAZ-T7A | 4-phase max per output; no SNSAVG/SNSN dual-path sensing; integrated LDO bias; 2.7V–5.5V VCC. | Targeted at mobile SoC power; lacks remote sensing amplifiers and CLKOUT sync; lower current capability. | Choose for battery-powered portable designs where footprint and bias integration outweigh phase count and precision sensing needs. |
| MP2965EK-LF-P | 6-phase, dual-output; supports DrMOS only (no discrete MOSFET gate drive); no IMON outputs; 4.5V–26V VIN range. | Optimized for enterprise SSDs and storage controllers; lacks sub-milliohm DCR support and differential remote sensing. | Choose when using DrMOS exclusively and system-level current telemetry is not required; higher VIN tolerance suits 12V intermediate bus. |
Compared with ISL91302BIRAZ-T7A and MP2965EK-LF-P, the LTC7852ERHE#PBF uniquely combines 6-phase flexibility, dual independent current monitoring, sub-milliohm DCR sensing, and deterministic multichip synchronization - making it the only option qualified for high-end server VRMs demanding <0.5% regulation and <100ns transient response.
Availability
LTC7852ERHE#PBF is available at Aetrix Electronics and suitable for server motherboard design, AI accelerator power delivery, telecom baseband units, and high-density intermediate bus converters requiring stable component supply, long-term lifecycle assurance, and full production traceability.
Supply support for LTC7852ERHE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and computing markets since 1965.
The LTC7852ERHE#PBF belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered specifically for high-current, low-voltage CPU/GPU VRMs in data centers and AI infrastructure where efficiency, accuracy, and phase scalability are critical.
FAQ
What is the minimum on-time specification for the LTC7852ERHE#PBF, and why does it matter?
The LTC7852ERHE#PBF has a guaranteed minimum on-time of 40ns. This enables stable operation at very high switching frequencies (up to 1.2MHz) and high step-down ratios - essential for generating sub-1V core voltages from 12V or 48V inputs without pulse-skipping instability. The 40ns tON(MIN) directly supports compact magnetics and fast transient response in AI accelerator VRMs.
How does the LTC7852ERHE#PBF support sub-milliohm DCR current sensing?
The LTC7852ERHE#PBF uses a dual-path current sense architecture: SNSAVG provides low-pass filtering while SNSN adds high-pass filtering, jointly improving SNR by 14dB. This allows accurate current measurement with inductors as low as 0.2mΩ DCR - reducing conduction losses and enabling >95% efficiency at 200A loads without external op-amps or gain stages.
Can the LTC7852ERHE#PBF be used with discrete MOSFETs and external gate drivers?
Yes, the LTC7852ERHE#PBF is explicitly designed to drive discrete N-channel MOSFETs via external gate drivers. Its PWM outputs are three-state compatible and reference to VDD (3.3V), with programmable dead-time control via external RC networks. Unlike the LTC7852-1 variant, the LTC7852ERHE#PBF supports full discrete power train implementation with DCR or resistive current sensing.
What package type and thermal characteristics apply to the LTC7852ERHE#PBF?
The LTC7852ERHE#PBF uses a 48-lead 5mm × 6mm plastic GQFN package with exposed thermal pad (Pin 49). Its junction-to-ambient thermal resistance is θJA = 30°C/W when properly soldered to a 4-layer PCB with 1-in² copper pour. This enables continuous 120A output per rail at 125°C ambient with appropriate airflow and heatsinking.
Does the LTC7852ERHE#PBF support synchronization across multiple ICs for >6-phase operation?
Yes, the LTC7852ERHE#PBF includes dedicated PLLIN and CLKOUT pins for deterministic multichip synchronization. Connecting CLKOUT of one LTC7852ERHE#PBF to PLLIN of another enables precise phase alignment - supporting 8-phase (4+2 mode), 10-phase (5+1 mode), or 12-phase (3+3 mode) configurations with <1° phase skew and no beat-frequency artifacts.
LTC7852ERHE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- 48-GQFN (5x6)
LTC7852ERHE#PBF FAQ
1.How can I place an order for LTC7852ERHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7852ERHE#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 LTC7852ERHE#PBF reliable?
The price and inventory of LTC7852ERHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7852ERHE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7852ERHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7852ERHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7852ERHE#PBF?
LTC7852ERHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7852ERHE#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 LTC7852ERHE#PBF?
For technical support, including LTC7852ERHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7852ERHE#PBF requirements.
6.How does Aetrix verify that LTC7852ERHE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7852ERHE#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 LTC7852ERHE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7852ERHE#PBF?
All LTC7852ERHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7852ERHE#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 LTC7852ERHE#PBF part is unused and in its original packaging.
Return procedure for LTC7852ERHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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