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Analog Devices Inc. LTC1629IG#PBF
- Part No.:
- LTC1629IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1629IG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,454
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Product details
Overview
LTC1629IG#PBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving external N-channel MOSFETs in current-mode PolyPhase architecture. It delivers up to 40A output with ±1% voltage accuracy, 150–300kHz phase-lockable switching frequency, and true remote differential sensing for high-current desktop/server power rails.
For engineers reviewing the LTC1629IG#PBF datasheet, LTC1629IG#PBF pinout, LTC1629IG#PBF application, or LTC1629IG#PBF equivalent, this controller enables high-efficiency, low-noise, multi-phase DC/DC conversion in space-constrained industrial and computing systems requiring stable 1.6V–5V outputs at >20A.
Technical Context
The LTC1629IG#PBF implements fixed-frequency current-mode control with two independent PWM channels operating 180° out of phase, reducing input/output RMS ripple by √2× versus single-phase designs. Its OPTI-LOOP™ compensation supports wide output capacitance/ESR ranges without stability compromise.
It integrates a differential amplifier (ADA = 0.995–1.005 V/V, CMRR = 46–55 dB) for true remote sensing, a 5V internal LDO (INTVCC), and phase-locked loop synchronization (PLLIN, CLKOUT) supporting up to 12-phase expansion. The RUN/SS pin combines soft-start ramping (1.2µA current source), short-circuit timeout, and shutdown control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Accuracy | ±1% over temperature and line - ensures tight regulation for CPU/GPU core rails |
| Switching Frequency Range | 150–300kHz (phase-lockable) - balances efficiency vs. component size; 1.8MHz effective ripple frequency with 2-phase operation |
| Input Voltage Range | 4V to 36V - supports wide-input industrial and telecom supply rails |
| Duty Cycle Max | 99% - enables ultra-low dropout operation down to VIN − VOUT ≈ 0.1V |
| Current Sense Threshold | 75mV typical (62–88mV) - sets peak inductor current with <1% gain error across temp |
| Remote Sensing Accuracy | Differential amp gain = 0.995–1.005 V/V, CMRR ≥ 46dB - rejects PCB trace IR drop in high-current paths |
| Soft-Start Control | Adjustable via external capacitor on RUN/SS pin - prevents inrush current during power-up |
Pinout & Package
Available in 28-lead plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm pitch. Thermal resistance θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start timer / run enable / short-circuit detector | 1.2µA current source charges external cap; latchoff triggered if VEAIN drops below 70% of setpoint |
| SENSE1+/SENSE2+ (Pins 2,14) | Positive current sense inputs | Connect to high-side of RSENSE; referenced to SENSE1−/2− for accurate peak-current detection |
| SENSE1−/SENSE2− (Pins 3,13) | Negative current sense inputs | Return path for sense resistors; forms Kelvin connection to minimize layout-induced offset |
| EAIN (Pin 4) | Error amplifier inverting input | Compares feedback voltage to 0.800V reference; determines ITH voltage and thus output current limit |
| PLLFLTR (Pin 5) | PLL loop filter node | DC voltage (0–2.4V) sets oscillator frequency; also accepts AC sync signal on PLLIN (Pin 6) |
| PHASMD (Pin 7) | Phase mode select | Configures controller 2 and CLKOUT phase offsets: 180°, 180°, or 240° relative to controller 1 |
| ITH (Pin 8) | Error amplifier output / current threshold control | Voltage (0–2.4V) directly scales current comparator threshold; primary compensation node |
| SGND (Pin 9) | Signal ground reference | Must be isolated from PGND; serves as common return for all analog circuitry and sense paths |
| VDIFFOUT (Pin 10) | Differential amplifier output | Drives external resistor divider to set output voltage; provides true remote sensing of VOUT+/VOUT− |
| VOS+/VOS− (Pins 11,12) | Op-amp inputs | Configurable as unity-gain diff amp (LTC1629-PG) or uncommitted op-amp (LTC1629); gain-bandwidth = 2MHz |
| TG1/TG2 (Pins 16,27) | Top gate drivers | Floating N-channel drivers (INTVCC swing above SW node); 30–90ns transition times |
| SW1/SW2 (Pins 17,26) | Switch node connections | Connect to inductor high-side; voltage swings from −0.3V (Schottky drop) to VIN |
| BOOST1/BOOST2 (Pins 18,25) | Bootstrap supplies | Capacitors between BOOST–SW provide floating gate drive; voltage = INTVCC + SW |
| BG1/BG2 (Pins 19,23) | Bottom gate drivers | Ground-referenced N-channel drivers (0–INTVCC swing); optimized for synchronous rectification |
| PGND (Pin 20) | Power ground | Return for bottom MOSFET sources and CIN negative terminals; separate from SGND |
| INTVCC (Pin 21) | Internal 5V LDO output | Powers drivers and logic; bypassed with 1µF ceramic + ≥4.7µF tantalum; switchover to EXTVCC at 4.7V |
| EXTVCC (Pin 22) | External bias input | Optional high-efficiency supply for INTVCC; must be ≤7V; reduces thermal load vs. internal LDO |
| VIN (Pin 24) | Main input supply | 4–36V input; decoupled directly to SGND with low-ESR ceramic capacitors |
| CLKOUT (Pin 28) | Phase-synchronized clock output | Drives PLLIN of additional LTC1629 controllers for seamless 3–12 phase expansion |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase™ dual-phase interleaving | Reduces input/output RMS ripple by √2×, enabling smaller CIN/COUT and lower ESR requirements |
| OPTI-LOOP™ compensation | Allows stable operation across 10µF–10,000µF output capacitance and 0.5–100mΩ ESR without redesign |
| True remote differential sensing | Integrated differential amplifier eliminates PCB trace IR drop errors in >20A applications |
| Phase-lockable architecture | Supports daisy-chained multi-phase systems up to 12 controllers with evenly spaced phases |
| 99% max duty cycle | Enables ultra-low dropout operation essential for high-current, low-VOUT rails (e.g., 1.6V @ 40A) |
| Integrated 5V LDO with EXTVCC switchover | Reduces self-heating by bypassing internal regulator when external 5V is available |
Applications
| Desktop CPU Core Power | Internet Server VRM |
|---|---|
|
Use Scenario: Delivering 1.2–1.8V at 30–60A to modern x86 processors under dynamic load transients. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing top/bottom MOSFET timing, current sharing, and remote voltage sensing. Use Value: 180° phase shift cuts input ripple current by 70%, reducing required CIN RMS rating and EMI filtering complexity. |
Use Scenario: High-density 12V-to-3.3V/5V conversion for memory modules and ASICs in 1U rack servers. IC Role / Device Role / Timing Role: PolyPhase controller coordinating multiple power stages with synchronized CLKOUT to minimize system-level noise coupling. Use Value: ±1% output accuracy and true remote sensing maintain regulation despite >100mΩ board interconnect resistance. |
| Large Memory Arrays | DC Power Distribution Systems |
|
Use Scenario: Providing tightly regulated 1.5V/1.8V to DDR4/LPDDR5 memory banks with fast load-step response. IC Role / Device Role / Timing Role: Current-mode controller with OPTI-LOOP™ ensuring stable transient response across varying COUT configurations. Use Value: Adjustable soft-start (via RUN/SS cap) prevents inrush into large memory capacitor banks during cold boot. |
Use Scenario: Centralized 48V-to-12V/5V conversion feeding distributed point-of-load regulators in telecom infrastructure. IC Role / Device Role / Timing Role: Master phase controller synchronizing up to 11 slave LTC1629 units via CLKOUT/PLLIN for coherent multi-kW output. Use Value: Phase-locking eliminates beat frequencies between converters, simplifying system-level EMI compliance testing. |
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 |
|---|---|---|---|
| MP2940AGQSE-LF-Z | Single-chip dual-phase controller with integrated MOSFET drivers; no external bootstrap diodes required; 4.5–16V VIN range | Targeted at mid-power client platforms (≤35A); lacks CLKOUT for >2-phase expansion; no true remote differential sensing | Select MP2940 for cost-sensitive, space-constrained designs where 2-phase suffices and input voltage is ≤16V |
| ISL95836IRZ | Intel VR12.5-compliant dual-phase controller; supports DVID, PROCHOT#, and SVID interface; 4.5–24V VIN | Designed specifically for Intel CPU VRMs; requires SVID host communication; no standalone analog mode | Select ISL95836 for Intel-based server/desktop platforms requiring full VR12.5 compliance and digital telemetry |
Compared with MP2940AGQSE-LF-Z and ISL95836IRZ, the LTC1629IG#PBF offers broader input range (4–36V), true remote sensing, and scalable PolyPhase expansion - making it uniquely suited for high-current industrial and custom computing power supplies where flexibility and analog control integrity are critical.
Availability
LTC1629IG#PBF is available at Aetrix Electronics and suitable for desktop CPU core power, internet server VRMs, and DC power distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1629IG#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and computing markets.
The LTC1629IG#PBF belongs to Linear's PolyPhase® high-current controller family, designed specifically for efficient, low-noise, multi-phase DC/DC conversion in high-performance computing and data center power systems.
FAQ
What is the maximum output current capability of the LTC1629IG#PBF?
The LTC1629IG#PBF itself does not deliver current - it controls external N-channel MOSFETs. In a properly designed 2-phase system with appropriate magnetics and FETs (e.g., IRF7811/IRF7809), the LTC1629IG#PBF enables up to 40A continuous output. Peak current depends on RSENSE, inductor value, and thermal design; the current sense threshold is 75mV typical, setting peak inductor current per phase.
Does the LTC1629IG#PBF include a power good (PGOOD) output?
No - the LTC1629IG#PBF is the base variant without PGOOD. The LTC1629IG-PG#PBF includes the open-drain PGOOD pin (replacing AMPMD). For LTC1629IG#PBF, system-level power good monitoring must be implemented externally using the EAIN feedback signal or VDIFFOUT output.
How does the RUN/SS pin function in the LTC1629IG#PBF?
The RUN/SS pin on the LTC1629IG#PBF serves three functions: (1) applying >1.5V enables operation after soft-start; (2) an external capacitor sets soft-start ramp time via a 1.2µA internal current source; (3) if VEAIN falls below 70% of nominal during operation, the capacitor discharges to trigger short-circuit shutdown. Pulling RUN/SS below 0.8V forces immediate shutdown.
Can the LTC1629IG#PBF synchronize with other controllers?
Yes - the LTC1629IG#PBF supports full phase synchronization via its PLLIN and CLKOUT pins. The PLLIN pin accepts an external clock (e.g., from another LTC1629), and CLKOUT provides a phase-aligned output to drive the PLLIN of up to 11 additional controllers, enabling seamless 3–12 phase systems with evenly spaced switching events.
What package type and temperature range does the LTC1629IG#PBF use?
The LTC1629IG#PBF uses a 28-lead plastic SSOP (G package) with 0.635mm lead pitch and operates over –40°C to +85°C ambient temperature. Its junction-to-ambient thermal resistance is 95°C/W, requiring appropriate PCB copper area and airflow for high-current applications.
LTC1629IG#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
LTC1629IG#PBF FAQ
1.How can I place an order for LTC1629IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1629IG#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 LTC1629IG#PBF reliable?
The price and inventory of LTC1629IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1629IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC1629IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1629IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1629IG#PBF?
LTC1629IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1629IG#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 LTC1629IG#PBF?
For technical support, including LTC1629IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1629IG#PBF requirements.
6.How does Aetrix verify that LTC1629IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1629IG#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 LTC1629IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1629IG#PBF?
All LTC1629IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1629IG#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 LTC1629IG#PBF part is unused and in its original packaging.
Return procedure for LTC1629IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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