My Inquiry
My Account
Analog Devices Inc. LTC7852IRHE#TRPBF
- Part No.:
- LTC7852IRHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC7852IRHE#TRPBF.pdf
- Description:
- 6-PHASE BUCK CONTROLLER DRIVES D
- Quantity:
- Payment:
- Shipping:
Inventory:3,400
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7852IRHE#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 40ns minimum on-time, delivers ±0.5% output voltage accuracy across 0.5V–2.0V, and operates with DrMOS, power blocks, or discrete MOSFETs in telecom, datacom, and server power systems.
For engineers reviewing the LTC7852IRHE#TRPBF datasheet, LTC7852IRHE#TRPBF pinout, LTC7852IRHE#TRPBF application, or LTC7852IRHE#TRPBF equivalent, this page provides verified phase configuration logic, DCR sensing architecture, remote differential sensing implementation, and multichip interleaving support - all confirmed for the LTC7852 (not LTC7852-1) in its 48-lead GQFN package.
Technical Context
The LTC7852IRHE#TRPBF implements a proprietary current-mode control architecture with dual independent error amplifiers, two sets of remote differential sense amplifiers (VOSNS1±/VOSNS2±), and six PWM outputs with programmable phase alignment via PHCFG. Its current sensing uses dual negative inputs (SNSNx/SNSAVGx) per phase to enhance SNR for sub-milliohm DCR sensing.
It features integrated 1.5V (V1P5) and 3.3V (VDD) LDOs, 20µA FREQ-pin current source for resistor-programmed switching frequency (250kHz–1.2MHz), and PLLIN/CLKOUT synchronization capability. Hiccup-mode overcurrent protection and precise 0.5V reference ensure robust operation under transient load steps and short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0.5V to 2.0V - enables direct regulation of modern low-voltage processor cores and ASICs. |
| tON(MIN) | 40ns - supports high-frequency operation (up to 1.2MHz) at high step-down ratios without pulse-skipping. |
| Output Voltage Accuracy | ±0.5% - guaranteed over temperature and line/load, critical for tight-tolerance digital supply rails. |
| Phase Configurations | 1–6 phases per output - flexible partitioning (e.g., 4+2, 3+3, 5+1) via PHCFG pin state for optimal thermal and ripple management. |
| Switching Frequency | 250kHz to 1.2MHz - set by external resistor on FREQ pin; enables trade-off between efficiency and passive size. |
| Package | 48-lead 5mm × 6mm plastic GQFN - thermally enhanced for high-power density VRM designs with exposed pad soldered to PCB ground. |
| VCC Range | 4.5V to 5.5V - powers internal logic and gate drivers; decoupling required per datasheet layout guidelines. |
Pinout & Package
Package: 48-lead (5mm × 6mm) plastic GQFN with exposed thermal pad (Pin 49), rated for –40°C to +125°C junction temperature. Thermal resistance θJA = 30°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| V1P5 (18) | Internally generated 1.5V supply | Bypass to SGND with 2.2µF ceramic; powers IMON circuitry and serves as reference for IMON1/IMON2 outputs. |
| IMON1 (19), IMON2 (17) | Dual output current monitor outputs | Differential voltage vs. V1P5 gives linear current indication per channel; enables real-time telemetry without external shunts. |
| FREQ (22) | Frequency programming input | Sinks 20µA; resistor to GND sets oscillator frequency from 250kHz to 1.2MHz with ±5% tolerance. |
| PHCFG (21) | Phase configuration select | GND/floating/INTVCC selects 4+2 / 3+3 / 5+1 phase split between outputs; determines PWM phase angles per Table 1. |
| SNSP1–6 (31,34,37,2,5,8), SNSN1–6 (30,33,36,3,6,9), SNSAVG1–6 (32,35,38,1,4,7) | Current sense inputs (positive, second negative, first negative) | Enables ultra-low-DCR sensing (down to 0.2mΩ); SNSAVG/SNSN pair improves SNR by 14dB vs. single-path sensing. |
| VOSNS1± (25,26), VOSNS2± (14,13) | Dual remote differential sense inputs | Unity-gain diff amps reject IR drop in PCB traces; require matched-length routing to load for ±0.5% accuracy. |
| PWM1–6 (41–46) | Top-gate drive outputs | Three-state compatible; logic-high level equals VDD (3.3V); drives external gate drivers or DrMOS inputs directly. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current monitoring | IMON1/IMON2 outputs referenced to V1P5 provide linear analog current readback per output - eliminates need for external current-sense amplifiers in telemetry-enabled systems. |
| Sub-milliohm DCR sensing architecture | Uses dual-path (SNSP/SNSN/SNSAVG) filtering with bandwidth tuning (L/DCR ratio) to resolve <0.2mΩ inductor DCR - maximizes efficiency while minimizing heat and board area. |
| Programmable multiphase interleaving | PHCFG pin configures 3 distinct dual-output phase splits (4+2, 3+3, 5+1); CLKOUT/PLLIN enables daisy-chained 8-/10-/12-phase systems with precise phase alignment. |
| High-accuracy remote sensing | Dual differential amplifiers (VOSNS1±/VOSNS2±) with <1mV offset and >100dB CMRR maintain ±0.5% regulation despite PCB trace IR drops up to 50mV. |
| Hiccup-mode overcurrent protection | Automatically cycles shutdown/restart on sustained overcurrent - limits thermal stress during output shorts without requiring external circuitry. |
Applications
| Server CPU Core VRM | AI Accelerator Power Delivery |
|---|---|
|
Use Scenario: Regulating 0.8V–1.2V core supplies for dual-socket Xeon or EPYC processors under dynamic 200A+ loads. IC Role / Device Role / Timing Role: Six-phase dual-output controller managing two independent 120A/60A rails with interleaved PWM timing to reduce input/output ripple. Use Value: 40ns tON(MIN) enables 800kHz+ operation at 12V→1V conversion, reducing inductor size by 40% vs. 400kHz alternatives while maintaining stability. |
Use Scenario: Powering multi-die GPU or TPU modules requiring tightly regulated 0.75V–0.9V rails with fast transient response. IC Role / Device Role / Timing Role: Dual-output controller with independent ITH/SS/PGOOD per rail, enabling asymmetric phase allocation (e.g., 5+1) for compute vs. memory subsystems. Use Value: ±0.5% output accuracy and dual remote sensing ensure compliance with PCIe Gen5/Gen6 voltage tolerance specs (<±3%) under full load step transients. |
| Telecom Baseband Unit | Datacenter DC Distribution |
|
Use Scenario: High-efficiency 48V-to-12V intermediate bus conversion feeding multiple point-of-load regulators in 5G RU equipment. IC Role / Device Role / Timing Role: Primary controller driving discrete N-MOSFETs with external gate drivers; leverages VCC-independent VIN range for wide-input flexibility. Use Value: Sub-milliohm DCR sensing with SNSAVG/SNSN architecture achieves >95% peak efficiency at 100A, reducing thermal design margin by 15°C. |
Use Scenario: Redundant 12V/48V distribution in modular server racks requiring synchronized multi-rail startup and fault reporting. IC Role / Device Role / Timing Role: Dual-output controller with PGOOD1/PGOOD2 open-drain indicators and RUN1/RUN2 enable sequencing; supports multichip CLKOUT daisy-chain for system-wide clock sync. Use Value: PLLIN synchronization ensures phase-aligned switching across 4+ LTC7852IRHE#TRPBF units - cuts input capacitor RMS current by 65% vs. unsynchronized operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7851IUFD#TRPBF | 4-phase dual-output controller in 36-lead QFN; lacks IMON outputs and SNSAVG/SNSN dual-path sensing; tON(MIN) = 60ns. | Targeted at mid-range servers and storage controllers where 120A max per rail suffices and telemetry is not required. | Select when cost-sensitive designs accept reduced phase count, no current monitoring, and relaxed DCR sensing capability. |
| MP2960AGU-P-Z | 6-phase dual-output controller with PMBus interface; integrates MOSFET drivers; no V1P5/IMON; supports only DrMOS (no discrete MOSFET option). | Designed for digitally managed VRMs with telemetry, sequencing, and fault logging via SMBus/PMBus. | Select when digital control, telemetry logging, and integrated drivers outweigh need for analog current monitoring and discrete MOSFET flexibility. |
Compared with LTC7851IUFD#TRPBF and MP2960AGU-P-Z, the LTC7852IRHE#TRPBF uniquely combines analog current monitoring (IMON), ultra-low-DCR sensing (0.2mΩ), and discrete MOSFET support - making it optimal for high-efficiency, analog-telemetry-enabled server VRMs where layout-controlled precision outweighs digital bus requirements.
Availability
LTC7852IRHE#TRPBF is available at Aetrix Electronics and suitable for server CPU VRMs, AI accelerator power delivery, telecom baseband units, and datacenter DC distribution systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LTC7852IRHE#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 industrial, automotive, communications, and computing markets with precision power, signal chain, and RF solutions.
The LTC7852IRHE#TRPBF belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered specifically for high-current, low-voltage CPU/GPU/ASIC VRMs demanding ultra-precise regulation, advanced current sensing, and scalable phase architecture.
FAQ
What is the minimum on-time specification for the LTC7852IRHE#TRPBF, and why does it matter?
The LTC7852IRHE#TRPBF has a guaranteed minimum on-time of 40ns. This enables stable operation at high switching frequencies (up to 1.2MHz) even with large input-to-output voltage ratios - such as 12V-to-0.9V conversion - without pulse-skipping or instability. In practice, this allows smaller magnetics and capacitors while maintaining transient response, directly improving power density in space-constrained server and AI hardware. The 40ns spec is validated across temperature and process corners per the datasheet's Electrical Characteristics table.
How does the LTC7852IRHE#TRPBF support ultra-low-DCR current sensing, and what is the lowest DCR it can accurately measure?
The LTC7852IRHE#TRPBF uses a dual-path current sensing architecture with separate SNSP, SNSN, and SNSAVG inputs per phase to improve signal-to-noise ratio by 14dB. This allows accurate sensing down to 0.2mΩ DCR with proper PCB layout - verified in the Applications Information section. The SNSAVG filter bandwidth is set to 3/5 of the L/DCR time constant, while SNSN uses 1/5, enabling noise rejection without sacrificing bandwidth. This eliminates the need for lossy sense resistors, preserving efficiency in high-current VRMs.
Can the LTC7852IRHE#TRPBF be used with discrete MOSFETs and external gate drivers, or is it limited to DrMOS?
Yes, the LTC7852IRHE#TRPBF is explicitly designed to work with discrete N-channel MOSFETs and external gate drivers - unlike the LTC7852-1 variant, which is optimized for DrMOS. Its PWM outputs are 3.3V logic-level (VDD-referenced), compatible with standard gate drivers like the LT1766 or discrete driver stages. The datasheet's Typical Application schematic shows discrete MOSFETs (L1–L4, L4–L5) driven directly by PWM1–PWM6, confirming full discrete support in the LTC7852IRHE#TRPBF.
What is the role of the V1P5 pin on the LTC7852IRHE#TRPBF, and is it required for operation?
V1P5 (Pin 18) is an internally generated 1.5V regulator output that powers the IMON1 and IMON2 current monitor circuits and serves as their reference voltage. It must be bypassed to SGND with a 2.2µF low-ESR ceramic capacitor per the Pin Functions section. While the controller operates without IMON functionality if V1P5 is unused, disabling V1P5 breaks IMON1/IMON2 output linearity - so it is required for any design using analog current telemetry. The LTC7852-1 variant omits V1P5 and IMON entirely.
How does phase configuration work on the LTC7852IRHE#TRPBF, and what are the valid modes?
Phase configuration on the LTC7852IRHE#TRPBF is controlled by the PHCFG pin (Pin 21): grounding selects 4+2 mode (four phases on Output 1, two on Output 2), floating selects 3+3 mode, and tying to INTVCC selects 5+1 mode. These configurations determine PWM phase angles per Table 1 in the datasheet - e.g., in 3+3 mode, Output 1 phases are spaced at 0°/120°/240°, Output 2 at 60°/180°/300°. All modes maintain interleaving to minimize input/output ripple and thermal stress.
LTC7852IRHE#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)
LTC7852IRHE#TRPBF FAQ
1.How can I place an order for LTC7852IRHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7852IRHE#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 LTC7852IRHE#TRPBF reliable?
The price and inventory of LTC7852IRHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7852IRHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7852IRHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7852IRHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7852IRHE#TRPBF?
LTC7852IRHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7852IRHE#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 LTC7852IRHE#TRPBF?
For technical support, including LTC7852IRHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7852IRHE#TRPBF requirements.
6.How does Aetrix verify that LTC7852IRHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7852IRHE#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 LTC7852IRHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7852IRHE#TRPBF?
All LTC7852IRHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7852IRHE#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 LTC7852IRHE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7852IRHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7852IRHE#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…
