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Analog Devices Inc. LTC7852IRHE#PBF
- Part No.:
- LTC7852IRHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC7852IRHE#PBF.pdf
- Description:
- 6-PHASE BUCK CONTROLLER DRIVES D
- Quantity:
- Payment:
- Shipping:
Inventory:106
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Product details
Overview
LTC7852IRHE#PBF from Analog Devices is a dual-output, six-phase current-mode synchronous step-down controller designed for high-current CPU/GPU VRMs. It supports 1–6-phase per output, delivers ±0.5% output voltage accuracy (0.5V–2.0V), achieves 40ns minimum on-time, and operates with DrMOS, power blocks, or discrete MOSFETs - enabling 120A+ single-rail designs in telecom and server systems.
For engineers reviewing the LTC7852IRHE#PBF datasheet, LTC7852IRHE#PBF pinout, LTC7852IRHE#PBF application, or LTC7852IRHE#PBF equivalent, key selection factors include phase configuration flexibility (4+2/3+3/5+1), sub-milliohm DCR sensing capability, dual remote differential sensing, programmable 250kHz–1.2MHz switching frequency, and hiccup-mode overcurrent protection.
Technical Context
The LTC7852IRHE#PBF implements a proprietary current-mode architecture with dual independent error amplifiers and interleaved six-phase PWM generation. Its two-stage current sensing (SNSAVG/SNSN) enhances SNR for ultra-low-DCR inductors (<0.2mΩ), while integrated PLL synchronization enables precise multi-IC phase alignment up to 12 phases.
It features dual 1.5V/3.3V internal LDOs (V1P5/VDD), programmable current limit via ILIM pins (10–30mV steps), and flexible RUN/SS control with 1.22V enable threshold and 5µA soft-start charge current - all operating across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0.5V to 2.0V - supports modern low-voltage core rails with ±0.5% total accuracy including line/load/temp. |
| Switching Frequency | 250kHz to 1.2MHz - set by external resistor on FREQ pin; enables optimization of efficiency vs. size for high-density VRMs. |
| tON(MIN) | 40ns - allows stable operation at high step-down ratios (e.g., 12V→0.9V) with >1MHz switching. |
| Phase Configurations | 4+2, 3+3, or 5+1 - selected via PHCFG pin; enables asymmetric current sharing between outputs (e.g., 120A + 60A). |
| Current Sense Threshold | 10–30mV (LTC7852), adjustable in 5mV steps - sets peak inductor current limit without external components. |
| Remote Sensing | Dual differential amplifiers (VOSNS±1/2) - rejects PCB IR drop for <±10mV load regulation error at full current. |
| Package | 48-lead 5mm × 6mm plastic GQFN - exposes thermal pad for ≤30°C/W θJA; rated for –40°C to 125°C TJ. |
Pinout & Package
48-lead (5mm × 6mm) plastic GQFN package with exposed thermal pad (Pin 49), optimized for high-power density and thermal performance in multi-phase VRMs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 20) | Bias supply input | 4.5V–5.5V external supply powering control logic; bypassed with 0.1–1µF ceramic capacitor. |
| PHCFG (Pin 21) | Phase configuration select | GND/floating/INTVCC selects 4+2/3+3/5+1 phase split between outputs; determines PWM phase angles. |
| FREQ (Pin 22) | Oscillator frequency set | Sources 20µA; resistor to GND programs 250kHz–1.2MHz switching frequency. |
| ILIM1/ILIM2 (Pins 23,16) | Current limit threshold | Resistor-divider or direct voltage sets 10–30mV sense threshold in 5mV steps per channel. |
| RUN1/RUN2 (Pins 24,15) | Enable control inputs | 1.22V threshold with 140mV hysteresis; internal 1.3µA pull-up enables controlled startup. |
| VOSNS1+/VOSNS1– (Pins 25,26) | Output 1 remote sense inputs | Connect to feedback divider tap and load ground; unity-gain differential amplifier rejects IR drop. |
| ITH1/ITH2 (Pins 27,12) | Error amplifier output / compensation | Drives current comparator threshold; external RC network sets loop bandwidth and stability. |
| SS1/SS2 (Pins 28,11) | Soft-start ramp inputs | 5µA internal current charges external capacitor; 22nF min sets linear VOUT ramp from prebias. |
| SNSP1–6 (Pins 31,34,37,2,5,8) | Positive current sense inputs | Accept DCR or DrMOS current-sense signals; paired with SNSN/SNSAVG for noise-rejected sensing. |
| SNSN1–6 / SNSAVG1–6 (Pins 30,33,36,3,6,9 / 32,35,38,1,4,7) | Negative current sense inputs | LTC7852-specific dual-path sensing: SNSAVG (3× bandwidth) and SNSN (5× bandwidth) filter DCR signals. |
| PWM1–6 (Pins 41–46) | Gate drive outputs | Three-state compatible; logic-level outputs referenced to VDD (3.3V); drive external gate drivers or DrMOS. |
| CLKOUT (Pin 40) | Master clock output | Syncs secondary LTC7852/LTC7852-1 ICs; rising edge aligns with PWM1 for deterministic phase daisy-chaining. |
| PLLIN (Pin 47) | External sync input | Accepts 250kHz–1.2MHz clock; locks internal oscillator with integrated PLL filter for multi-IC coherence. |
| GND / Exposed Pad (Pins 48,49) | Signal and thermal ground | Must be soldered to large PCB copper area; primary return path for all analog/digital currents and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-milliohm DCR sensing | Enables use of <0.2mΩ inductors via dual-path SNSAVG/SNSN filtering, improving efficiency >1% at 100A and reducing thermal noise-induced jitter. |
| Dual independent remote sensing | Two matched differential amplifiers (VOSNS±1/2) provide <±10mV load regulation error across 0–120A, eliminating board-level IR drop errors. |
| Flexible multiphase configuration | Single-pin PHCFG selection of 4+2/3+3/5+1 splits allows asymmetric current allocation - e.g., 120A on VOUT1, 60A on VOUT2 - without redesign. |
| Programmable 40ns tON(MIN) | Supports >1MHz operation at 12V→0.9V conversion, enabling smaller magnetics and faster transient response in space-constrained server VRMs. |
| Hiccup-mode overcurrent protection | Auto-retry shutdown on short-circuit or overload limits thermal stress during fault conditions, extending MOSFET lifetime in unattended systems. |
| Integrated PLL synchronization | Allows precise phase alignment across multiple LTC7852/LTC7852-1 ICs - e.g., 12-phase system with 30° spacing - minimizing input/output ripple without external timing components. |
Applications
| Server CPU Voltage Regulator | AI Accelerator Power Delivery |
|---|---|
|
Use Scenario: High-current, low-voltage core rail (0.8V/120A) for x86 or Arm-based server CPUs with tight transient requirements. IC Role / Device Role / Timing Role: Dual-output six-phase controller managing phase interleaving, current balancing, and adaptive voltage positioning (AVP) via ITH loop. Use Value: ±0.5% output accuracy and 40ns tON(MIN) ensure stable operation under 50A/µs load steps while minimizing output capacitance. |
Use Scenario: Multi-rail power for GPU/AI ASICs requiring independent 0.75V/80A and 0.9V/60A supplies with synchronized switching. IC Role / Device Role / Timing Role: Asymmetric 4+2 phase configuration with PLL-synced CLKOUT/PLLIN enables deterministic 30° phase offset across rails. Use Value: Dual remote sensing eliminates IR drop errors across long PCB traces, maintaining <±5mV regulation at full load. |
| Telecom Baseband Processor | High-Density DC-DC Module |
|
Use Scenario: Compact 48V-to-1V intermediate bus converter in 5G baseband units with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Six-phase interleaved controller driving DrMOS devices; FREQ pin set to 800kHz for optimal efficiency/size trade-off. Use Value: Sub-milliohm DCR sensing reduces conduction losses by ~0.8W at 100A, lowering module temperature rise by 12°C. |
Use Scenario: Plug-in power module for industrial PLCs requiring field-replaceable, pre-tested VRM with dual 0.5V–2.0V outputs. IC Role / Device Role / Timing Role: Controller with integrated V1P5 (1.5V) and VDD (3.3V) LDOs powers external gate drivers and monitoring circuitry. Use Value: GQFN package with exposed pad enables 30°C/W thermal resistance, supporting 15W dissipation in convection-cooled modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95816IRZ-T7A | 6-phase, single-output only; no dual independent sensing; 50ns tON(MIN); supports Intel VR13/VR14 protocols. | Targeted at Intel client platforms; lacks asymmetric dual-output flexibility and sub-0.5mΩ DCR support. | Select when Intel compliance and single-rail simplicity outweigh need for dual-rail precision and ultra-low-DCR operation. |
| MP2960AGQ-Z | 6-phase, dual-output; 60ns tON(MIN); integrated MOSFET drivers; no PLL sync; supports SMBus/PMBus. | Designed for cost-sensitive embedded systems; lacks remote differential sensing and <40ns tON for extreme step-down ratios. | Prefer for SMBus-configurable, driver-integrated solutions where 0.5V–1.8V output range and digital interface are mandatory. |
Compared with ISL95816IRZ-T7A and MP2960AGQ-Z, the LTC7852IRHE#PBF uniquely combines dual independent remote sensing, 40ns tON(MIN), and sub-milliohm DCR capability - making it the only choice for high-accuracy, high-density, high-transient server and AI power delivery where board-level IR drop and efficiency at 100A+ are critical.
Availability
LTC7852IRHE#PBF is available at Aetrix Electronics and suitable for server motherboard design, AI accelerator power modules, and telecom baseband processor VRMs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC7852IRHE#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and computing markets with precision signal chain and power solutions.
The LTC7852IRHE#PBF belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered specifically for high-efficiency, high-current, low-voltage VRMs in datacenter CPUs, GPUs, and AI accelerators - emphasizing accuracy, thermal robustness, and multi-IC scalability.
FAQ
What is the minimum on-time specification for the LTC7852IRHE#PBF, and why does it matter?
The LTC7852IRHE#PBF has a guaranteed minimum on-time of 40ns. This enables stable operation at very high step-down ratios (e.g., 12V input to 0.9V output) with switching frequencies above 1MHz, allowing smaller inductors and capacitors while maintaining transient response. It directly supports modern low-voltage, high-current CPU/GPU rails where traditional controllers fail to regulate cleanly.
How does the LTC7852IRHE#PBF support dual-output configurations with different current requirements?
The LTC7852IRHE#PBF uses the PHCFG pin to configure asymmetric phase splits: grounding selects 4+2 mode (e.g., 80A + 40A), floating selects 3+3 mode (60A + 60A), and tying to INTVCC selects 5+1 mode (100A + 20A). Each output has independent RUN, SS, ITH, and remote sensing paths - enabling true independent regulation and current limiting for heterogeneous loads like CPU cores and I/O rails.
Can the LTC7852IRHE#PBF be used with discrete MOSFETs instead of DrMOS?
Yes, the LTC7852IRHE#PBF is explicitly designed to drive discrete N-channel MOSFETs via external gate drivers. Its PWM outputs are logic-level (3.3V referenced to VDD) and three-state compatible. The controller's current sensing architecture supports both DCR-based inductor sensing (via SNSP/SNSN/SNSAVG) and DrMOS current monitor inputs - giving designers full flexibility in power stage selection.
What is the purpose of the dual negative sense pins (SNSN and SNSAVG) on the LTC7852IRHE#PBF?
The LTC7852IRHE#PBF uses SNSN and SNSAVG as complementary negative inputs paired with each SNSP positive input to implement a patented two-pole filtering technique. SNSAVG provides higher bandwidth (3× L/DCR), while SNSN provides lower bandwidth (5× L/DCR), jointly enhancing SNR by 14dB for ultra-low-DCR inductors (<0.2mΩ). This preserves current measurement fidelity in noisy high-dI/dt environments.
Does the LTC7852IRHE#PBF require external components for soft-start, and what is the minimum value?
Yes, soft-start is implemented by charging an external capacitor from the SS1/SS2 pins using an internal 5µA current source. The minimum recommended capacitor value is 22nF, which yields a ~22ms ramp time to reach the 0.5V reference. Larger capacitors extend soft-start duration linearly - e.g., 100nF gives ~100ms - enabling controlled inrush current limiting during power-up of large output capacitor banks.
LTC7852IRHE#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)
LTC7852IRHE#PBF FAQ
1.How can I place an order for LTC7852IRHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7852IRHE#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 LTC7852IRHE#PBF reliable?
The price and inventory of LTC7852IRHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7852IRHE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7852IRHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7852IRHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7852IRHE#PBF?
LTC7852IRHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7852IRHE#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 LTC7852IRHE#PBF?
For technical support, including LTC7852IRHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7852IRHE#PBF requirements.
6.How does Aetrix verify that LTC7852IRHE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7852IRHE#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 LTC7852IRHE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7852IRHE#PBF?
All LTC7852IRHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7852IRHE#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 LTC7852IRHE#PBF part is unused and in its original packaging.
Return procedure for LTC7852IRHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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