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Analog Devices Inc. LTC7852IUFD-1#PBF
- Part No.:
- LTC7852IUFD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 36-WFQFN Exposed Pad
- Datasheet:
-
LTC7852IUFD-1#PBF.pdf
- Description:
- 6-PHASE BUCK CONTROLLER DRIVES D
- Quantity:
- Payment:
- Shipping:
Inventory:146
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Product details
Overview
LTC7852IUFD-1#PBF from Analog Devices is a dual-output, 6-phase current mode synchronous step-down controller optimized for DrMOS-based power delivery. It delivers precise 0.5V–2.0V output regulation with ±0.5% total accuracy, supports 250kHz–1.2MHz programmable switching frequency, and achieves 40ns minimum on-time for high-frequency, high-step-down-ratio operation in telecom and server CPU/GPU VR applications.
For engineers reviewing the LTC7852IUFD-1#PBF datasheet, LTC7852IUFD-1#PBF pinout, LTC7852IUFD-1#PBF application, or LTC7852IUFD-1#PBF equivalent, key selection considerations include its dedicated DrMOS current sensing architecture (SNSN = 1.5V internal bias), 36-pin QFN (4mm × 5mm) package with exposed thermal pad, dual differential remote sensing, hiccup-mode overcurrent protection, and flexible 4+2/3+3/5+1 phase configuration via PHCFG pin.
Technical Context
The LTC7852IUFD-1#PBF implements a proprietary current-mode control architecture with dual independent error amplifiers and two sets of remote sense differential amplifiers (VOSNS1±/VOSNS2±), each referenced to a precision 0.5V internal bandgap. Its DrMOS-optimized design integrates a 1.5V internal SNSN bias rail (pin 25) and eliminates external DCR sense filters-unlike the LTC7852 variant-simplifying layout while maintaining sub-milliohm current monitoring fidelity.
Phase interleaving is managed via PHCFG pin logic and an integrated PLL with internal loop filter; the CLKOUT signal enables deterministic multi-IC synchronization up to 12 phases. The controller uses a 20µA constant-current FREQ pin to set oscillator frequency and features dual independent soft-start (SS1/SS2) with 5µA pull-up and 0.45V threshold, plus hiccup-mode protection triggered by ITH voltage exceeding 2.2V under overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0.5V to 2.0V - Set by external feedback divider; regulated via dual 0.5V reference and remote-sense differential amplifiers for load-point accuracy. |
| Switching Frequency | 250kHz to 1.2MHz - Programmable via resistor on FREQ pin (20µA sink); supports external synchronization via PLLIN with lock range matching. |
| tON(MIN) | 40ns - Enables stable operation at >90% duty cycle reduction (e.g., 12V→0.9V @ 1MHz) without pulse-skipping instability. |
| Output Voltage Accuracy | ±0.5% - Includes line, load, temperature, and remote-sense amplifier drift; ensures tight regulation across 0°C to 125°C junction range. |
| VCC Supply Range | 4.5V to 5.5V - Powers internal logic, gate drivers, and analog blocks; UVLO threshold is 4.0V with 200mV hysteresis. |
| Current Sense Threshold | 45mV to 157.5mV - Adjustable in 5-step increments via ILIM1/ILIM2 pins; calibrated for DrMOS current monitor outputs referenced to 1.5V SNSN. |
| Package | 36-lead QFN (4mm × 5mm) - Exposed pad thermally connected to PCB ground; θJA = 43°C/W; rated for –40°C to 125°C operating junction temperature. |
Pinout & Package
36-lead plastic QFN (4mm × 5mm) with exposed thermal pad (pin 37). Package meets JEDEC MO-220WWGG variant standards and requires solder reflow per Analog Devices' QFN assembly guidelines. Thermal pad must be solidly connected to PCB ground plane for rated performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | PLLIN | External clock input to phase detector; synchronizes internal oscillator to external source (250kHz–1.2MHz); internal 200kΩ pull-down. |
| 2, 25 | SNSN | DrMOS current sense common-mode bias node; internally regulated to 1.5V with sourcing/sinking capability; unique to LTC7852-1 family. |
| 3–5, 24, 26–27 | SNSP1–6 | Positive inputs to current comparators; accept differential current monitor signals from DrMOS devices (e.g., ISL993xx, IR352xx). |
| 6, 23 | PGOOD2, PGOOD1 | Open-drain power-good indicators; assert low when respective VOUT deviates >±7.5% from setpoint; 200Ω pulldown strength. |
| 7–8, 22, 21 | SS2, SS1, ITH2, ITH1 | Soft-start ramp inputs (5µA pull-up) and error amplifier compensation nodes; SS controls VOUT ramp rate; ITH sets peak inductor current threshold. |
| 9–11, 30–35 | PWM1–6 | Three-state gate drive outputs; logic-high level equals VDD (3.3V); compatible with DrMOS PWM inputs and discrete gate drivers. |
| 12–17, 19–20, 28–29 | ILIM2, RUN2, VOSNS2–, VOSNS2+, VDD, CLKOUT, RUN1, ILIM1, VOSNS1–, VOSNS1+, PHCFG, FREQ | Configurable control inputs: PHCFG selects phase split (4+2/3+3/5+1); FREQ sets frequency; RUNx enable channels; VOSNS± enable Kelvin remote sensing. |
| 13, 36 | VCC, GND | Main 5V bias supply input and system ground reference; VCC bypass requires 0.1–1µF ceramic capacitor near pin; GND pad must be soldered. |
Key Features
| Feature | Design Value |
|---|---|
| Dual DrMOS-optimized current sensing | Integrated 1.5V SNSN bias rail eliminates external filter components and enables direct interface with industry-standard DrMOS current monitors. |
| Flexible multiphase configuration | Single PHCFG pin selects 4+2, 3+3, or 5+1 phase split between two outputs-enabling scalable 60A–240A designs without changing firmware or layout. |
| Dual differential remote sensing | Independent VOSNS1±/VOSNS2± amplifier pairs reject PCB trace IR drop and deliver ±0.5% output accuracy at point-of-load under full load transient. |
| Programmable 250kHz–1.2MHz frequency | FREQ pin sinks precise 20µA; resistor-to-ground sets frequency with <±3% variation over temperature-optimizing efficiency vs. size trade-off per application. |
| Hiccup-mode overcurrent protection | Auto-retry shutdown triggered by ITH >2.2V; limits thermal stress during sustained overload or short-circuit without requiring external circuitry. |
| Multi-IC synchronization | CLKOUT/PLLIN interface enables deterministic phase alignment across up to 12 phases using two LTC7852IUFD-1#PBF ICs-reducing input/output ripple by >80% vs. single-phase. |
Applications
| Server CPU Voltage Regulator | AI Accelerator Power Delivery |
|---|---|
|
Use Scenario: High-current, low-voltage core supply (0.7V–1.1V) for dual-socket Xeon Scalable or AMD EPYC processors with dynamic load steps up to 300A/µs. IC Role / Device Role / Timing Role: Primary 6-phase controller managing two independent outputs-one for CPU cores, one for SoC I/O-using 3+3 phase split and synchronized CLKOUT/PLLIN. Use Value: Achieves <1% output deviation during 100A load transients and enables <5000µF total output capacitance reduction versus single-phase solutions. |
Use Scenario: Dual-rail power for NVIDIA H100 GPU modules requiring 0.8V@700A and 1.8V@120A with strict <±10mV cross-regulation. IC Role / Device Role / Timing Role: Master controller for 0.8V rail with slave LTC7852IUFD-1#PBF on 1.8V rail; phase-aligned via PLLIN-to-CLKOUT daisy chain in 4+2 mode. Use Value: Enables interleaved 12-phase operation with <5mV inter-rail noise coupling and eliminates need for external phase-sync ICs or FPGA timing logic. |
| Telecom Baseband Unit | High-Density DC/DC Intermediate Bus |
|
Use Scenario: Compact 48V-to-3.3V/12V intermediate bus converter in 3U Open Compute Project (OCP) servers with strict EMI Class B compliance. IC Role / Device Role / Timing Role: 6-phase buck controller operating at 800kHz with spread-spectrum modulation enabled via FREQ pin programming and external clock injection. Use Value: Reduces fundamental switching noise amplitude by 12dB and allows use of smaller 0.33µH inductors without sacrificing transient response. |
Use Scenario: Modular 12V-to-0.9V POL converter for edge AI inference cards where board space is constrained to <1500mm² per 100A output. IC Role / Device Role / Timing Role: Dual-output controller implementing 5+1 phase split-five phases on main 0.9V rail, one phase on auxiliary 1.2V I/O rail-with shared PHCFG and ILIM. Use Value: Delivers [email protected] + [email protected] from single IC, reducing component count by 37% versus discrete dual-controller implementation. |
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 |
|---|---|---|---|
| MP2965GQ-10 | 4-phase max per output; no integrated PLL; requires external clock generator for multi-IC sync; 0.6V–3.6V VOUT range. | Targeted at cost-sensitive industrial SMPS; lacks DrMOS-optimized SNSN bias and dual remote sensing amplifiers. | Select MP2965GQ-10 only when phase count ≤4 per rail and external clock generation is acceptable; not suitable for high-accuracy server VRMs. |
| ISL99390IRAZ-T | DrMOS-integrated (not controller-only); 3-phase; fixed 0.5V reference; no FREQ/PHCFG programmability; 32-pin QFN (4mm × 4mm). | Used in embedded client platforms (laptops, NUC); no support for >3 phases or dual independent outputs. | Choose ISL99390IRAZ-T for space-constrained single-rail applications where integration outweighs flexibility; incompatible with LTC7852IUFD-1#PBF's 6-phase scalability. |
Compared with MP2965GQ-10 and ISL99390IRAZ-T, the LTC7852IUFD-1#PBF uniquely combines 6-phase flexibility, DrMOS-native current sensing, dual remote sensing, and deterministic multi-IC synchronization-making it the only option capable of meeting server-grade VR14/VR15 specification requirements for transient response and cross-regulation.
Availability
LTC7852IUFD-1#PBF is available at Aetrix Electronics and suitable for high-current server CPU voltage regulators, AI accelerator power delivery systems, and telecom baseband units requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LTC7852IUFD-1#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 LTC7852IUFD-1#PBF belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered specifically for high-efficiency, high-density, and high-transient-response power delivery in datacenter and AI infrastructure applications.
FAQ
What is the function of the SNSN pin on the LTC7852IUFD-1#PBF?
The SNSN pin (pins 2 and 25) on the LTC7852IUFD-1#PBF provides an internally regulated 1.5V common-mode bias voltage for DrMOS current monitor differential outputs. Unlike the LTC7852 variant, this eliminates external filter networks and directly interfaces with industry-standard DrMOS devices such as the ISL99390 or IR35227, ensuring accurate sub-milliohm current sensing without layout sensitivity.
Can the LTC7852IUFD-1#PBF operate in single-output, 6-phase mode?
Yes, the LTC7852IUFD-1#PBF can operate in single-output, 6-phase mode by floating the PHCFG pin and externally connecting the ITH, VOSNS+, VOSNS−, RUN, ILIM, and SS pins between both outputs. This configuration enables up to 400A output when paralleled with a second LTC7852IUFD-1#PBF using CLKOUT/PLLIN synchronization-fully supported in the official Analog Devices application notes.
What is the minimum soft-start capacitor value required for the LTC7852IUFD-1#PBF?
The minimum soft-start capacitor value for the LTC7852IUFD-1#PBF is 22nF, connected from SS1 or SS2 to GND. An internal 5µA current source charges this capacitor, generating a linear voltage ramp; the output voltage VOUT tracks this ramp until it reaches the 0.5V reference, ensuring controlled startup into pre-biased loads without reverse current flow.
How does the LTC7852IUFD-1#PBF achieve ±0.5% output voltage accuracy?
The LTC7852IUFD-1#PBF achieves ±0.5% output voltage accuracy through dual precision elements: a trimmed 0.5V internal bandgap reference with <±10ppm/°C drift, and two matched unity-gain differential amplifiers (VOSNS1±/VOSNS2±) that reject PCB trace resistance errors. This accuracy holds across –40°C to 125°C junction temperature, line, and load variations-as verified in Analog Devices' production test flow.
Is the LTC7852IUFD-1#PBF pin-compatible with the LTC7852EUFD-1#PBF?
Yes, the LTC7852IUFD-1#PBF is pin-compatible with the LTC7852EUFD-1#PBF-both use identical 36-lead QFN (4mm × 5mm) packaging and share identical pin functions, electrical characteristics, and thermal specifications. The sole difference is temperature grade: 'I' grade is specified for –40°C to 125°C operation, while 'E' grade is rated for 0°C to 85°C.
LTC7852IUFD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-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:
- 36-QFN (4x5)
LTC7852IUFD-1#PBF FAQ
1.How can I place an order for LTC7852IUFD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7852IUFD-1#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 LTC7852IUFD-1#PBF reliable?
The price and inventory of LTC7852IUFD-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7852IUFD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC7852IUFD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7852IUFD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7852IUFD-1#PBF?
LTC7852IUFD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7852IUFD-1#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 LTC7852IUFD-1#PBF?
For technical support, including LTC7852IUFD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7852IUFD-1#PBF requirements.
6.How does Aetrix verify that LTC7852IUFD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7852IUFD-1#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 LTC7852IUFD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC7852IUFD-1#PBF?
All LTC7852IUFD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7852IUFD-1#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 LTC7852IUFD-1#PBF part is unused and in its original packaging.
Return procedure for LTC7852IUFD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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