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Analog Devices Inc. LTC1629IG-PG#TRPBF
- Part No.:
- LTC1629IG-PG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1629IG-PG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,298
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Product details
Overview
LTC1629IG-PG#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving external N-channel MOSFETs in 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 server power rails.
For engineers reviewing the LTC1629IG-PG#TRPBF datasheet, LTC1629IG-PG#TRPBF pinout, LTC1629IG-PG#TRPBF application, or LTC1629IG-PG#TRPBF equivalent, this controller is selected for high-efficiency, multi-phase DC/DC conversion in desktop/server VRMs where input ripple reduction, thermal sharing, and precise remote voltage regulation are critical design requirements.
Technical Context
The LTC1629IG-PG#TRPBF implements current-mode control with two independent PWM channels operating 180° out of phase, enabling 1.8MHz effective ripple cancellation at the input and output capacitors. Its OPTI-LOOP™ compensation supports wide output capacitance and ESR ranges without stability compromise.
It integrates a differential amplifier (VDIFFOUT, VOS±) for true remote sensing across load terminals, a RUN/SS pin combining soft-start ramping and short-circuit timeout, and a dedicated PGOOD open-drain output for system power sequencing - features absent in the non-PG variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Accuracy | ±1% over line, load, and temperature - ensures tight regulation for CPU/GPU core rails. |
| Switching Frequency Range | 150–300kHz (phase-lockable) - enables synchronized multi-controller expansion up to 12 phases. |
| Input Voltage Range | 4V to 36V - supports wide-input industrial and telecom power distribution systems. |
| Duty Cycle Capability | Up to 99% - maintains regulation during ultra-low dropout operation (e.g., 5V→4.95V). |
| Current Sense Threshold | 75mV typical - sets peak inductor current with minimal loss across RSENSE shunt resistors. |
| Power Good Threshold | ±7.5% of set output voltage - provides reliable rail monitoring with 10µs response time. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and server applications. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS | Soft-start timing & shutdown control | Capacitor-based ramp controls ITH startup; falling below 0.8V disables all functions. |
| SENSE1+/SENSE2+ | Positive current sense inputs | Connect to high-side of RSENSE; used with SENSE– to set per-phase current limit. |
| SENSE1–/SENSE2– | Negative current sense inputs | Return path for differential current sensing; referenced to SGND, not PGND. |
| EAIN | Error amplifier feedback input | Compares regulated output voltage (via VDIFFOUT divider) against 0.8V internal reference. |
| PGOOD | Open-drain power-good indicator | Pulled low when EAIN deviates >±7.5% from 0.8V - signals valid output for sequencer logic. |
| TG1/TG2 | Top gate drivers | Floating N-channel drivers with BOOST1/2 supply; drive external high-side MOSFET gates. |
| BG1/BG2 | Bottom gate drivers | GND-referenced N-channel drivers; control synchronous rectification with precise dead-time control. |
| VDIFFOUT | Differential amplifier output | Provides remote-sensed output voltage referenced to SGND; drives external resistor divider for EAIN. |
| VOS+/VOS– | Op-amp inputs | Configured as unity-gain differential amp in LTC1629IG-PG#TRPBF; no AMPMD pin required. |
| CLKOUT | Phase-synchronized clock output | Drives PLLIN of additional controllers to daisy-chain up to 12 phases with even phasing. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase™ dual-phase architecture | Reduces RMS input/output capacitor ripple by √2 vs single-phase - cuts required CIN/COUT volume by ~30%. |
| True remote differential sensing | Compensates for PCB trace IR drop up to 1.5V common-mode range - essential for >20A loads. |
| OPTI-LOOP™ compensation | Enables stable loop response across 10µF–10,000µF output capacitance with varying ESR - eliminates re-tuning for different bulk caps. |
| Internal 5V LDO + EXTVCC switchover | Auto-selects between internal LDO and external 4.7–7V supply for INTVCC - improves efficiency by bypassing linear regulator under high-load conditions. |
| Overvoltage soft-latch protection | Prevents nuisance trips during transient overvoltage events while still protecting downstream ICs - latches only on sustained >+9.5% excursion. |
Applications
| Desktop CPU Power Delivery | Internet Server VRM |
|---|---|
Use Scenario: Regulating 1.2V/40A core voltage for high-end x86 processors with dynamic load steps up to 30A/µs. IC Role / Device Role / Timing Role: Dual-phase controller managing interleaved top/bottom gate timing, current sharing, and remote voltage feedback via VDIFFOUT/VOS±. Use Value: 180° phase shift reduces input ripple current by 70%, allowing smaller ceramic CIN and lowering EMI filter cost. |
Use Scenario: Generating 3.3V/30A for memory subsystems in dual-socket servers with strict ±1% tolerance and hot-swap capability. IC Role / Device Role / Timing Role: Primary PolyPhase controller coordinating with secondary LTC1629-PG units via CLKOUT/PLLIN for 6-phase total solution. Use Value: PGOOD output enables safe power-up sequencing with BMC; ±7.5% trip threshold avoids false faults during load transients. |
| Large Memory Arrays | DC Power Distribution Systems |
Use Scenario: Supplying 1.8V/25A to DDR4 DIMM modules with tight regulation under burst read/write loads. IC Role / Device Role / Timing Role: Dual-phase buck controller using current-mode control to ensure per-phase current balance across parallel inductors. Use Value: Current foldback limits MOSFET dissipation during short-circuit events without full latchoff - preserves system availability. |
Use Scenario: Centralized 12V→5V conversion feeding multiple board-level point-of-load regulators in telecom shelf systems. IC Role / Device Role / Timing Role: High-current intermediate bus converter with VIN=36V support and 99% duty cycle for brownout resilience. Use Value: Wide 4–36V input range accommodates unregulated front-end supplies; thermal design simplified by phase interleaving. |
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 |
|---|---|---|---|
| MP2940AGQ-PR | Integrated MOSFETs (40V/30A), no external RSENSE needed; lacks PGOOD and CLKOUT sync capability. | Suitable for space-constrained designs but limited to ≤30A; cannot scale beyond 2 phases. | Select MP2940AGQ-PR for compact, lower-current solutions where board area outweighs scalability needs. |
| LTC3883IUH#PBF | Digital PMBus interface, 3.3V/5V/12V programmable outputs, integrated ADC; requires external EEPROM and firmware configuration. | Used in intelligent power systems requiring telemetry, margining, and fault logging - adds complexity vs analog-only LTC1629IG-PG#TRPBF. | Select LTC3883IUH#PBF when digital control, real-time monitoring, or multi-rail coordination is mandatory. |
Compared with MP2940AGQ-PR and LTC3883IUH#PBF, the LTC1629IG-PG#TRPBF offers superior analog simplicity, deterministic phase synchronization, and proven reliability in high-current server VRMs - making it optimal for cost-sensitive, high-volume, analog-controlled power stages.
Availability
LTC1629IG-PG#TRPBF is available at Aetrix Electronics and suitable for desktop computing, internet server power delivery, and large memory array applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC1629IG-PG#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 acquired Linear Technology in 2017 and maintains its legacy high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC1629 product line was designed specifically for high-current, multi-phase DC/DC conversion in computing and data center infrastructure - emphasizing thermal sharing, input ripple suppression, and robust remote sensing.
FAQ
What is the function of the PGOOD pin on the LTC1629IG-PG#TRPBF?
The PGOOD pin on the LTC1629IG-PG#TRPBF is an open-drain output that signals valid regulation: it pulls low when the EAIN voltage deviates more than ±7.5% from the 0.8V reference, indicating the output is outside specification. When within tolerance, PGOOD remains high-impedance and must be pulled up externally to ≤7V. This enables precise power sequencing in server motherboards and ensures downstream logic only activates after stable voltage is established - a key safety feature absent in the non-PG LTC1629IG#TRPBF.
How does the LTC1629IG-PG#TRPBF achieve true remote voltage sensing?
The LTC1629IG-PG#TRPBF achieves true remote voltage sensing using its integrated differential amplifier with VDIFFOUT, VOS+, and VOS− pins. The amplifier measures the voltage difference directly across the load's positive and negative terminals - not at the regulator's output pads - compensating for IR drops in PCB traces and connectors. In the LTC1629IG-PG#TRPBF, this amplifier is pre-configured as a unity-gain differential stage (no AMPMD pin required), delivering a ground-referenced VDIFFOUT signal that feeds the EAIN error amplifier - ensuring ±1% accuracy even at 40A output currents.
Can the LTC1629IG-PG#TRPBF operate in single-phase mode?
Yes, the LTC1629IG-PG#TRPBF can operate in single-phase mode by disabling one channel: tie PHASMD to GND to fix Controller 2 at 180° phase offset, then leave TG2/BG2/SW2/BOOST2/SENSE2± unconnected and unused. However, doing so forfeits PolyPhase benefits - input/output ripple increases, thermal load concentrates on one MOSFET pair, and maximum output current drops to ~20A. For true single-phase applications, Linear's LTC1772 or Analog Devices' LTC3850 are more optimized alternatives.
What is the purpose of the RUN/SS pin on the LTC1629IG-PG#TRPBF?
The RUN/SS pin on the LTC1629IG-PG#TRPBF serves three integrated functions: (1) enabling/disabling the controller (pull <0.8V to shut down), (2) controlling soft-start timing (capacitor ramp sets ITH rise rate), and (3) acting as a short-circuit timeout circuit (discharges if output falls below 70% nominal). During startup, a 1.2µA current charges the external capacitor; reaching 1.5V enables regulation, and hitting 4.1V triggers latchoff if output hasn't stabilized - providing both controlled ramp-up and fault protection in one pin.
Does the LTC1629IG-PG#TRPBF support external frequency synchronization?
Yes, the LTC1629IG-PG#TRPBF supports external frequency synchronization via the PLLIN pin, which accepts a TTL/CMOS clock input. The internal phase-locked loop locks the rising edge of TG1 to the rising edge of the PLLIN signal, enabling precise inter-controller alignment. When PLLIN is left open, the oscillator defaults to minimum frequency (~140kHz); applying a DC voltage to PLLFLTR also allows analog frequency tuning from 140kHz to 310kHz. This capability allows daisy-chaining up to 12 controllers using CLKOUT outputs for high-current (>100A) systems.
LTC1629IG-PG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- 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:
- 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-PG#TRPBF FAQ
1.How can I place an order for LTC1629IG-PG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1629IG-PG#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 LTC1629IG-PG#TRPBF reliable?
The price and inventory of LTC1629IG-PG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1629IG-PG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1629IG-PG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1629IG-PG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1629IG-PG#TRPBF?
LTC1629IG-PG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1629IG-PG#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 LTC1629IG-PG#TRPBF?
For technical support, including LTC1629IG-PG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1629IG-PG#TRPBF requirements.
6.How does Aetrix verify that LTC1629IG-PG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1629IG-PG#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 LTC1629IG-PG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1629IG-PG#TRPBF?
All LTC1629IG-PG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1629IG-PG#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 LTC1629IG-PG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1629IG-PG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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