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Analog Devices Inc. LTC7852ERHE#TRPBF
- Part No.:
- LTC7852ERHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC7852ERHE#TRPBF.pdf
- Description:
- 6-PHASE BUCK CONTROLLER DRIVES D
- Quantity:
- Payment:
- Shipping:
Inventory:3,547
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Product details
Overview
LTC7852ERHE#TRPBF 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 ±0.5% output voltage accuracy over 0.5V–2.0V range, delivers tON(MIN) = 40ns for high-frequency operation up to 1.2MHz, and enables sub-milliohm DCR sensing with dual differential remote sense amplifiers - used in server power delivery and telecom DC distribution systems.
For engineers reviewing the LTC7852ERHE#TRPBF datasheet, LTC7852ERHE#TRPBF pinout, LTC7852ERHE#TRPBF application, or LTC7852ERHE#TRPBF equivalent, key selection criteria include phase configuration flexibility (4+2/3+3/5+1), DrMOS-agnostic current monitoring, hiccup-mode overcurrent protection, and GQFN-48 package thermal performance (θJA = 30°C/W).
Technical Context
The LTC7852ERHE#TRPBF implements a proprietary current-sense architecture with dual SNSAVG/SNSN inputs per phase to enhance SNR for ultra-low-DCR inductors (down to 0.2mΩ), using internal filtering with bandwidths tuned to L/DCR ratios. Its error amplifier compares remote-sensed VOSNS+–VOSNS− against a precise 500mV reference, while ITH voltage modulates peak current per phase.
Phase interleaving is programmable via PHCFG pin (ground/floating/INTVCC selects 4+2/3+3/5+1), and synchronization is supported via PLLIN input or CLKOUT daisy-chaining across multiple ICs - enabling up to 12-phase operation with two LTC7852ERHE#TRPBF devices without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0.5V to 2.0V - supports modern low-voltage core rails (e.g., 0.9V CPU, 1.2V GPU) with ±0.5% total accuracy including line/load/temp. |
| Switching Frequency | 250kHz to 1.2MHz - set by resistor on FREQ pin (20µA source); enables trade-off between efficiency (low fSW) and component size (high fSW). |
| tON(MIN) | 40ns - allows stable operation at very low duty cycles (e.g., 12V→0.9V @ 1MHz), critical for high-step-down-ratio VRMs. |
| Current Sense Threshold | 10mV to 30mV in 5mV steps - configured via ILIM1/ILIM2 pins; supports accurate current limiting with sub-mΩ DCR inductors. |
| Remote Sensing | Dual differential amplifiers (VOSNS1±, VOSNS2±) - reject PCB IR drop and noise; require matched trace routing to maintain <0.5% gain error. |
| Package & Thermal | 48-lead 5mm × 6mm GQFN - exposed pad soldered to PCB; θJA = 30°C/W enables 120A+ output with standard 2-layer thermal relief. |
Pinout & Package
48-lead plastic GQFN (5mm × 6mm) with exposed thermal pad (Pin 49). Package meets JEDEC MO-220, RoHS-compliant, moisture sensitivity level 3.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 20) | Bias supply input | 4.5V–5.5V external rail powering control logic; requires local 0.1–1µF ceramic bypass to GND. |
| PHCFG (Pin 21) | Phase configuration select | Ground = 4+2 mode; float = 3+3 mode; INTVCC = 5+1 mode - determines PWM phase angle distribution between outputs. |
| FREQ (Pin 22) | Oscillator frequency set | 20µA current source; resistor to GND sets fSW from 250kHz–1.2MHz - no external capacitor needed. |
| ITH1/ITH2 (Pins 27,12) | Error amplifier output / current threshold | Voltage sets per-output peak inductor current; also serves as compensation node for type-II/III loop filters. |
| VOSNS1+/VOSNS1− (Pins 25,26) | Differential remote sense inputs | Connect to feedback divider midpoint and load ground - rejects PCB voltage drop; unity-gain, high-Z inputs. |
| SNSP1–SNSP6 (Pins 31,34,37,2,5,8) | Positive current sense inputs | Accept DCR or DrMOS current-sense signals; each paired with SNSN/SNSAVG for noise-rejecting dual-path sensing. |
| GND / Exposed Pad (Pins 48,49) | Signal & thermal ground | Must be connected to solid PCB ground plane; exposed pad soldering required for rated θJA = 30°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-milliohm DCR sensing | Uses dual-path SNSAVG/SNSN architecture to improve SNR by 14dB - enables use of 0.2mΩ inductors without external op-amps. |
| Flexible multiphase topology | Supports 1–6 phases per output; 4+2/3+3/5+1 configurations via single PHCFG pin - simplifies layout for asymmetric loads (e.g., CPU + GPU). |
| Dual independent current monitoring | IMON1/IMON2 outputs (LTC7852 only) provide linear voltage proportional to output current - enables real-time telemetry without shunt resistors. |
| Hiccup-mode overcurrent protection | Auto-retry shutdown on sustained overcurrent - limits thermal stress during short-circuit events without latching off. |
| Interleaved clock synchronization | Integrated PLL with CLKOUT/PLLIN allows daisy-chained multi-IC operation - supports 8/10/12-phase systems with deterministic phase alignment. |
Applications
| Server CPU Voltage Regulator | AI Accelerator Power Delivery |
|---|---|
|
Use Scenario: High-current, dynamically scaled core voltage for x86 or Arm-based servers requiring fast transient response and tight regulation. IC Role / Device Role / Timing Role: Dual-output controller managing 120A @ 0.9V (Output 1) and 60A @ 1.2V (Output 2) with independent phase interleaving and remote sensing. Use Value: ±0.5% output accuracy and 40ns minimum on-time enable stable 0.9V operation at 1MHz, reducing output capacitance by 30% vs. legacy controllers. |
Use Scenario: Powering GPU or AI ASICs with bursty workloads demanding >100A per rail and millivolt-level voltage tracking. IC Role / Device Role / Timing Role: Six-phase controller driving discrete MOSFETs or power blocks; uses IMON outputs for closed-loop current balancing across phases. Use Value: Dual differential remote sense amplifiers eliminate PCB IR drop errors, maintaining <±2mV regulation at full load under thermal gradient. |
| Telecom Baseband Power System | High-Density DC Distribution Unit |
|
Use Scenario: Compact, high-efficiency 48V-to-12V/5V conversion in 5G baseband units with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Configured in 3+3 mode to deliver dual regulated outputs; synchronized to system clock via PLLIN to reduce conducted EMI peaks. Use Value: 1.2MHz max switching frequency allows use of 0.22µH inductors, cutting solution size by 40% vs. 500kHz designs while maintaining <15mV ripple. |
Use Scenario: Modular DC-DC power shelf supplying multiple downstream boards with independent voltage and current monitoring. IC Role / Device Role / Timing Role: Master controller in daisy-chained 12-phase system (two LTC7852ERHE#TRPBF); CLKOUT drives PLLIN of slave IC for exact phase alignment. Use Value: Phase-aligned interleaving reduces input RMS current by 70%, allowing smaller bulk capacitors and lower conduction losses in shared bus design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL91302BIRZ-T7A | 4-phase dual-output; integrated MOSFET drivers; no SNSAVG/SNSN architecture; max fSW = 3MHz but no sub-mΩ DCR support. | Targeted at mobile SoC power; lacks remote sensing and phase scalability beyond 4 phases. | Choose for space-constrained portable designs where integrated drivers reduce BOM count, not for server-grade DCR sensing. |
| MP2965AGU-P | 6-phase dual-output; supports DrMOS only; no discrete MOSFET gate drive; fixed 0.6V reference (not 0.5V); no IMON outputs. | Optimized for DrMOS-based notebooks; lacks flexibility for discrete power stages or current telemetry. | Choose when using DrMOS modules exclusively and remote current monitoring is unnecessary. |
Compared with ISL91302BIRZ-T7A and MP2965AGU-P, the LTC7852ERHE#TRPBF uniquely combines sub-0.5mΩ DCR sensing capability, dual independent remote sense amplifiers, and scalable 1–6-phase per output configuration - making it the only option supporting both discrete MOSFET and DrMOS topologies with full telemetry in high-current infrastructure applications.
Availability
LTC7852ERHE#TRPBF is available at Aetrix Electronics and suitable for server CPU VRMs, AI accelerator power delivery, and telecom baseband systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and datacenter deployments.
Supply support for LTC7852ERHE#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, industrial automation, communications, and power management markets.
The LTC7852ERHE#TRPBF belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered specifically for high-efficiency, high-current DC/DC conversion in datacenter, AI, and telecom infrastructure where accuracy, thermal robustness, and phase scalability are critical.
FAQ
What is the minimum on-time specification for the LTC7852ERHE#TRPBF, and why does it matter?
The LTC7852ERHE#TRPBF has a guaranteed minimum on-time of 40ns. This enables stable operation at very high switching frequencies (up to 1.2MHz) and high input-to-output voltage step-down ratios - such as converting 12V to 0.9V at 1MHz. Without this spec, the controller would skip pulses or lose regulation under light-load or high-frequency conditions, compromising transient response and efficiency in modern CPU/GPU VRMs.
How does the LTC7852ERHE#TRPBF support sub-milliohm DCR current sensing?
The LTC7852ERHE#TRPBF uses a dual-path current sense architecture: each phase has separate SNSP (positive), SNSN (second negative), and SNSAVG (first negative) inputs. These paths are internally filtered with bandwidths tuned to the inductor's L/DCR time constant - improving SNR by 14dB. This allows reliable sensing down to 0.2mΩ DCR with minimal external components, eliminating need for dedicated current-sense amplifiers.
Can the LTC7852ERHE#TRPBF be used with both discrete MOSFETs and DrMOS modules?
Yes - the LTC7852ERHE#TRPBF supports both topologies. For discrete MOSFETs, it drives external gate drivers via PWM1–6 outputs and senses current via SNSP/SNSN/SNSAVG pins. For DrMOS, it accepts integrated current-sense signals directly - though the LTC7852-1 variant is optimized for DrMOS with internal 1.5V bias on SNSN. The LTC7852ERHE#TRPBF (standard version) retains full flexibility for either approach.
What is the role of the PHCFG pin on the LTC7852ERHE#TRPBF?
The PHCFG pin configures phase allocation between the two outputs: grounding selects 4+2 mode (4 phases on Output 1, 2 on Output 2), floating selects 3+3 mode, and tying to INTVCC selects 5+1 mode. This enables optimal current sharing and ripple cancellation for asymmetric loads - e.g., assigning more phases to a higher-current CPU rail while reserving fewer for a lower-current I/O rail.
Does the LTC7852ERHE#TRPBF include remote voltage sensing, and how is it implemented?
Yes - the LTC7852ERHE#TRPBF integrates two independent unity-gain differential amplifiers (VOSNS1± and VOSNS2±) for remote sensing. Each pair connects to the feedback divider midpoint and load ground point, rejecting PCB trace resistance and noise. The amplifier output feeds the error amplifier's inverting input, ensuring ±0.5% regulation accuracy regardless of board layout IR drop - critical for high-current, low-voltage rails.
LTC7852ERHE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-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:
- 48-GQFN (5x6)
LTC7852ERHE#TRPBF FAQ
1.How can I place an order for LTC7852ERHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7852ERHE#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 LTC7852ERHE#TRPBF reliable?
The price and inventory of LTC7852ERHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7852ERHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7852ERHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7852ERHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7852ERHE#TRPBF?
LTC7852ERHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7852ERHE#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 LTC7852ERHE#TRPBF?
For technical support, including LTC7852ERHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7852ERHE#TRPBF requirements.
6.How does Aetrix verify that LTC7852ERHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7852ERHE#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 LTC7852ERHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7852ERHE#TRPBF?
All LTC7852ERHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7852ERHE#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 LTC7852ERHE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7852ERHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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