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Analog Devices Inc. LTC1629EG-6#PBF
- Part No.:
- LTC1629EG-6#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1629EG-6#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:219
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Product details
Overview
LTC1629EG-6 from Analog Devices (formerly Linear Technology) is a dual-phase, polyphase synchronous step-down switching regulator controller with 0.6V ±1% reference, phase-lockable 150–300kHz fixed-frequency operation, true remote differential sensing, and power-good monitoring - designed for high-current DC/DC conversion in desktop computers, internet servers, and large memory arrays.
For engineers reviewing the LTC1629EG-6 datasheet, LTC1629EG-6 pinout, LTC1629EG-6 application, or LTC1629EG-6 equivalent, this controller enables scalable multi-phase designs up to 12 phases, supports wide input voltage (4V–36V), delivers up to 200A output via expansion, and integrates OPTI-LOOP® compensation for stable transient response across diverse output capacitance and ESR.
Technical Context
The LTC1629EG-6 implements current-mode control with two independent N-channel MOSFET gate drivers (TG1/BG1 and TG2/BG2), synchronized out-of-phase to reduce RMS input/output capacitor ripple. Its internal 5V LDO (INTVCC) powers control circuitry, while EXTVCC switchover allows efficient external biasing above 4.7V.
A dedicated differential amplifier (VDIFFOUT, VOS±) provides true remote sensing across high-current load paths, and the RUN/SS pin combines soft-start ramping, short-circuit timeout, and shutdown control. The PLLIN/PLLFLTR interface enables precise frequency synchronization and phase alignment across multiple controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 0.600 V ±1% - sets precise output regulation point for 0.7V/40A and similar low-VOUT applications |
| Operating Frequency Range | 150 kHz to 300 kHz - fixed-frequency, phase-lockable architecture minimizes EMI and enables deterministic timing |
| Input Voltage Range | 4 V to 36 V - supports wide-range industrial and server power rails including 5V, 12V, and 24V inputs |
| Max Duty Cycle | 99.5% - enables very low dropout operation down to VIN − VOUT ≈ 0.1V, critical for high-efficiency near-rail conversion |
| Current Sense Threshold | 75 mV typical - defines peak inductor current limit per phase; scales linearly with RSENSE for accurate current sharing |
| Power-Good Accuracy | ±10% output window - PGOOD asserts when regulated output deviates beyond tolerance, enabling system-level fault management |
| Thermal Range | –40°C to +85°C - specified performance over full industrial temperature range for reliable server and embedded deployment |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0.635 mm pitch, 9.9 mm × 5.9 mm footprint, θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start & shutdown control | Capacitor-based ramp sets startup time; <0.8V forces full shutdown; discharge initiates short-circuit latchoff |
| SENSE1+/SENSE2+ (Pins 2,14) | Current sense positive inputs | Connect to high-side of current-sense resistors; define per-phase current trip threshold with SENSE– |
| SENSE1–/SENSE2– (Pins 3,13) | Current sense negative inputs | Return path for sense resistors; referenced to SGND; enable true Kelvin sensing of MOSFET source current |
| EAIN (Pin 4) | Error amplifier input | Receives scaled feedback from VDIFFOUT; compared against 0.6V reference to regulate output voltage |
| TG1/TG2 (Pins 16,27) | Top N-MOSFET gate drivers | Floating high-side drivers with BOOST supply; drive external high-voltage N-ch MOSFETs synchronously |
| BG1/BG2 (Pins 19,23) | Bottom N-MOSFET gate drivers | Ground-referenced drivers; switch synchronous rectifiers to replace Schottky diodes and improve efficiency |
| CLKOUT (Pin 28) | Phase-locked clock output | Drives additional LTC1629-6 controllers in daisy-chain configuration; enables up to 12-phase expansion |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase™ dual-phase architecture | Reduces input/output RMS ripple current by >70% vs single-phase, lowering capacitor stress and size requirements |
| True remote differential sensing (VDIFFOUT, VOS±) | Compensates for PCB trace IR drop in high-current systems (>20A), maintaining ±0.5% load regulation accuracy |
| OPTI-LOOP® compensation | Enables stable loop response across 10× variation in output capacitance and ESR without component changes |
| Phase-lockable oscillator (PLLIN/PLLFLTR) | Allows synchronization to external clock or master controller; supports precise phase offsets (60°/90°/120°) via PHASMD |
| Integrated 5V LDO with EXTVCC switchover | Reduces driver power loss by bypassing internal regulator when external 5V rail is available (e.g., from output stage) |
Applications
| Desktop Computer VRM | Internet Server Power Delivery |
|---|---|
Use Scenario: Regulating CPU core voltage (e.g., 0.7V/40A) from 12V intermediate bus under dynamic load transients. IC Role / Device Role / Timing Role: Dual-phase controller managing synchronous buck stages with out-of-phase switching to minimize input ripple and improve thermal distribution. Use Value: Enables compact, high-efficiency VRM design meeting Intel VR12/VR13 specs with <1% load regulation and fast transient recovery. |
Use Scenario: Delivering 12V-to-3.3V/20A power to memory modules in rack-mounted servers with strict thermal and noise constraints. IC Role / Device Role / Timing Role: Primary controller in 4-phase PolyPhase system using CLKOUT to synchronize auxiliary controllers for total 80A output. Use Value: Reduces required input bulk capacitance by 75% and cuts RMS input current losses, extending capacitor lifetime and easing board layout. |
| Large Memory Array Supply | DC Power Distribution System |
Use Scenario: Providing tightly regulated 1.2V/30A to DDR4/DDR5 DIMMs with millivolt-level accuracy across temperature and load. IC Role / Device Role / Timing Role: Dual-phase controller with true remote sensing (SENSE1±/SENSE2±) compensating for >50mΩ interconnect resistance between VRM and memory socket. Use Value: Maintains ±0.5% output accuracy at full load, eliminating need for point-of-load regulators and reducing BOM count. |
Use Scenario: Centralized 48V-to-12V/50A conversion feeding distributed point-of-load converters in telecom infrastructure. IC Role / Device Role / Timing Role: High-current front-end controller operating in 99% duty cycle dropout mode during brownout conditions (VIN = 13V). Use Value: Sustains regulated output down to VIN − VOUT = 0.1V, avoiding system reset during brief input sags common in 48V DC distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855EUFD#PBF | Single-phase, 4V–36V input, 0.6V reference, but lacks PolyPhase expansion and CLKOUT daisy-chain capability | Suitable for lower-current (<25A) applications where phase count and synchronization are not required | Select LTC3855EUFD#PBF only when dual-phase operation and multi-controller coordination are unnecessary. |
| MP8765GL-Z | Monolithic dual-phase controller (integrated MOSFETs), 4.5V–16V input, no remote sensing, no PLLIN/CLKOUT | Targeted at space-constrained consumer electronics; limited to mid-range input voltages and lacks server-grade diagnostics | Choose MP8765GL-Z for cost-sensitive, low-power applications where external MOSFET flexibility and wide VIN are not needed. |
Compared with LTC3855EUFD#PBF and MP8765GL-Z, the LTC1629EG-6 uniquely supports scalable multi-phase expansion, true remote sensing for high-current accuracy, and robust industrial temperature operation - making it the only choice for high-reliability, high-current server and computing power delivery.
Availability
LTC1629EG-6 is available at Aetrix Electronics and suitable for desktop computers, internet servers, and large memory arrays requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.
Supply support for LTC1629EG-6 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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LTC1629EG-6 belongs to Linear's PolyPhase® controller family, engineered specifically for high-current, multi-phase DC/DC conversion in computing and data center infrastructure where efficiency, thermal management, and scalability are critical.
FAQ
What is the maximum number of phases supported by the LTC1629EG-6?
The LTC1629EG-6 natively controls two phases and provides a CLKOUT signal that enables daisy-chaining up to 12 evenly phased controllers. This allows system-level output currents from 15A to 200A using identical LTC1629EG-6 units, with phase offsets programmable via the PHASMD pin. Each LTC1629EG-6 contributes two synchronized channels to the overall PolyPhase array.
Does the LTC1629EG-6 support true remote voltage sensing?
Yes, the LTC1629EG-6 includes a dedicated differential amplifier (VDIFFOUT, VOS+, VOS−) that senses both the positive and negative output terminals independently. This true Kelvin sensing compensates for IR drops in high-current PCB traces or connectors, ensuring ±0.5% load regulation accuracy even at 40A output - a key requirement for CPU and memory VRMs.
How does the RUN/SS pin function in short-circuit protection?
The RUN/SS pin serves dual roles: during startup, an external capacitor sets soft-start ramp time; after startup, the same capacitor acts as a short-circuit timeout timer. If output voltage falls below 70% of nominal, the capacitor discharges via internal current sources. When voltage drops to 0.8V, the LTC1629EG-6 latches off - preventing thermal runaway during sustained overloads.
Can the LTC1629EG-6 operate with input voltage close to the output voltage?
Yes, the LTC1629EG-6 supports very low dropout operation with up to 99.5% duty cycle. Its dropout detector forces periodic top-FET turn-off to recharge bootstrap capacitors when VIN approaches VOUT, sustaining regulation down to VIN − VOUT ≈ 0.1V. This enables efficient 12V-to-1.2V or 5V-to-0.7V conversion without external assist circuits.
What is the purpose of the OPTI-LOOP® compensation in the LTC1629EG-6?
OPTI-LOOP® compensation in the LTC1629EG-6 dynamically adjusts loop response based on output capacitance and ESR, allowing stable operation across a 10× range of ceramic or polymer capacitor values without manual compensation network changes. This simplifies design reuse across platforms and ensures robust transient response in varying load and layout conditions.
LTC1629EG-6#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 220kHz
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1629EG-6#PBF FAQ
1.How can I place an order for LTC1629EG-6#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1629EG-6#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 LTC1629EG-6#PBF reliable?
The price and inventory of LTC1629EG-6#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1629EG-6#PBF is usually 5 days.
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4.How is shipping managed for LTC1629EG-6#PBF?
LTC1629EG-6#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1629EG-6#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 LTC1629EG-6#PBF?
For technical support, including LTC1629EG-6#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1629EG-6#PBF requirements.
6.How does Aetrix verify that LTC1629EG-6#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1629EG-6#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 LTC1629EG-6#PBF meets industry standards.
7.What is the process for return or replacement of LTC1629EG-6#PBF?
All LTC1629EG-6#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1629EG-6#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 LTC1629EG-6#PBF part is unused and in its original packaging.
Return procedure for LTC1629EG-6#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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