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Analog Devices Inc. LTC1929CG-PG#TRPBF
- Part No.:
- LTC1929CG-PG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1929CG-PG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,757
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Product details
Overview
LTC1929CG-PG from Analog Devices (formerly Linear Technology) is a 2-phase, synchronous step-down switching regulator controller driving external N-channel MOSFETs in fixed-frequency current-mode architecture. It delivers ±1% output voltage accuracy, supports 4V–36V input, achieves up to 300kHz per phase with phase interleaving, and integrates true remote differential sensing for high-current server power rails.
For engineers reviewing the LTC1929CG-PG datasheet, LTC1929CG-PG pinout, LTC1929CG-PG application, or LTC1929CG-PG equivalent, this controller is selected for high-efficiency, low-ripple DC/DC conversion in multi-phase CPU core supplies, network server VRMs, and high-current memory arrays where thermal management, transient response, and input capacitor RMS current reduction are critical design constraints.
Technical Context
The LTC1929CG-PG implements a dual-channel, current-mode, phase-interleaved control architecture with independent top/bottom gate drivers (TG1/TG2, BG1/BG2), internal 5V LDO (INTVCC), and programmable oscillator (140–310kHz) via PLLFLTR. Its OPTI-LOOP™ compensation enables stable operation across wide output capacitance and ESR ranges.
It features integrated differential amplifier (VDIFFOUT, VOS±) for true remote sensing, RUN/SS pin with soft-start ramping and latched short-circuit shutdown, and PGOOD open-drain output (LTC1929-PG variant only) monitoring EAIN against ±7.5% trip threshold. The AMPMD pin configures internal precision resistors for unity-gain differential mode by default in LTC1929CG-PG.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 2-phase synchronous buck controller - enables interleaved operation to halve input/output RMS ripple current and improve transient response. |
| Input Voltage Range | 4V to 36V - supports wide-range industrial and telecom DC bus inputs without pre-regulation. |
| Output Voltage Accuracy | ±1% over temperature - ensures tight regulation for sensitive processor/memory rails. |
| Switching Frequency | 140kHz to 310kHz (PLLFLTR-controlled) - allows optimization of efficiency vs. size; 2-phase operation effectively doubles fundamental frequency at output. |
| Current Sense Threshold | 75mV typical (VSENSEMAX) - sets peak inductor current; enables precise current limiting and sharing between phases. |
| Duty Cycle Range | Up to 99.5% - supports very low dropout operation (e.g., 5V→4.95V), critical for point-of-load regulation near input rail. |
| PGOOD Threshold | ±7.5% of set output voltage (VEAIN) - provides reliable power-good signaling for system sequencing and fault detection. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0.025" pitch, RoHS-compliant, rated for 0°C to 85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start timing & latchable shutdown input | Capacitor-based ramp controls ITH release; <0.8V forces full shutdown; >4.1V arms short-circuit latchoff if VOUT fails to reach 70% of target. |
| SENSE1+/SENSE2+ (Pins 2,14) | Positive current sense inputs | Connect to high-side of RSENSE; used with SENSE– to set per-phase current limit threshold (75mV typical). |
| SENSE1–/SENSE2– (Pins 3,13) | Negative current sense inputs | Connect to low-side of RSENSE; differential pair defines current comparator reference for accurate phase current matching. |
| EAIN (Pin 4) | Error amplifier feedback input | Receives scaled VOUT from VDIFFOUT; compared to 0.800V internal reference to regulate output voltage. |
| VDIFFOUT (Pin 10) | Differential amplifier output | Provides remote-sensed VOUT referenced to SGND; drives external resistor divider to set regulated output voltage. |
| VOS+/VOS– (Pins 11,12) | Operational amplifier inputs | Configured as unity-gain differential amp by default (AMPMD grounded); supports high-CMRR remote sensing up to 5V common-mode. |
| PGOOD (Pin 15) | Open-drain power-good indicator | Pulled low when VEAIN deviates >±7.5% from 0.8V reference; enables system-level power sequencing and fault flagging. |
| TG1/TG2 (Pins 16,27) | Top N-MOSFET gate drivers | Floating drivers with INTVCC-referenced swing; drive external high-side FETs using BOOST1/BOOST2 bootstrap supplies. |
| BG1/BG2 (Pins 19,23) | Bottom N-MOSFET gate drivers | Ground-referenced drivers sourcing/sinking ≥3A peak; control synchronous rectification for high efficiency. |
| INTVCC (Pin 21) | Internal 5V LDO output | Supplies gate drivers and control circuitry; bypassed with 1µF ceramic + ≥4.7µF tantalum; switchover to EXTVCC occurs at 4.7V. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input capacitor RMS current by ~70% and output ripple amplitude by cancellation-enables smaller, lower-cost bulk capacitors. |
| OPTI-LOOP™ compensation | Allows stable loop response across wide range of output capacitance (10µF–10,000µF) and ESR (0.5mΩ–50mΩ), simplifying design for diverse load conditions. |
| True remote differential sensing | VDIFFOUT + VOS± path rejects PCB trace IR drop and noise-maintains ±1% regulation accuracy even with 100mΩ interconnect resistance. |
| Phase-lockable oscillator | PLLIN accepts external clock (e.g., system master clock); PLLFLTR pin enables DC voltage tuning (0–2.4V) for precise frequency setting from 140–310kHz. |
| Latched short-circuit protection | RUN/SS capacitor discharges during severe overcurrent; shutdown persists until RUN/SS is recycled-prevents uncontrolled restart under fault. |
Applications
| Desktop CPU Core Supply | Network Server VRM |
|---|---|
|
Use Scenario: Delivering 1.2V/60A to modern x86 CPU cores with fast load transients (0→50A in <1µs). IC Role / Device Role / Timing Role: Dual-channel current-mode controller coordinating two parallel buck stages with 180° phase offset to minimize input ripple and enhance dynamic response. Use Value: Achieves <1% output deviation during 50A load steps while reducing required input bulk capacitance by 75% versus single-phase implementation. |
Use Scenario: Generating 1.8V/40A for ASIC/FPGA logic rails in 1U rack-mounted servers with strict thermal envelope. IC Role / Device Role / Timing Role: 2-phase controller managing thermally distributed power delivery across two PCB layers; leverages phase interleaving to lower peak inductor temperature rise. Use Value: Enables use of smaller 1µH inductors per phase while maintaining <10mVpp output ripple-reducing board area by 35% vs. conventional designs. |
| Large Memory Array Power | Industrial DC Power Distribution |
|
Use Scenario: Supplying 1.35V/30A to DDR4 memory modules with tight voltage tolerance (±3%) and high PSRR requirements. IC Role / Device Role / Timing Role: Controller with true remote sensing (VDIFFOUT + VOS±) compensating for 50mΩ PCB plane resistance between VRM and DIMM socket. Use Value: Maintains ±0.8% regulation at load point despite 150mV IR drop-eliminates need for costly 4-layer power planes. |
Use Scenario: Converting 24V industrial bus to 5V/20A for PLC I/O modules operating in -40°C to 85°C ambient. IC Role / Device Role / Timing Role: High-input-voltage controller with 99.5% max duty cycle enabling direct 24V→5V conversion without pre-regulator stage. Use Value: Reduces BOM count by 3 components (no boost pre-regulator), improves system efficiency by 4.2% at full load, and lowers thermal stress on downstream regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2940AGQ-0000-Z (Monolithic Power) | Integrated power stages (no external MOSFETs); 4.5–16V VIN; no remote sensing; fixed 500kHz switching. | Suitable for space-constrained, medium-current (≤25A) applications where layout simplicity outweighs remote sensing and wide VIN needs. | Select MP2940 for compact, low-component-count designs below 30A; avoid when remote sensing, >16V input, or phase synchronization is required. |
| ISL95836IRZ (Renesas) | 3-phase capable; supports Intel VR12.5/VR13 protocols; includes SMBus interface; no PGOOD pin; 4.5–24V VIN. | Targeted at laptop CPU VRMs requiring dynamic VID updates and telemetry-lacks standalone PGOOD and wide-VIN flexibility of LTC1929CG-PG. | Choose ISL95836 for Intel-compliant mobile platforms; LTC1929CG-PG remains preferred for industrial/server applications needing robust fault signaling and 4–36V operation. |
Compared with MP2940AGQ-0000-Z and ISL95836IRZ, the LTC1929CG-PG uniquely combines wide-input operation (4–36V), true remote differential sensing, dedicated PGOOD output, and phase-lockable frequency control-making it optimal for high-reliability, high-current, thermally demanding server and infrastructure power systems.
Availability
LTC1929CG-PG is available at Aetrix Electronics and suitable for desktop CPU core supplies, network server VRMs, and industrial DC power distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC1929CG-PG 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 high-performance power management portfolio with rigorous automotive-grade qualification and military-grade screening options.
The LTC1929 product line was designed specifically for high-current, multi-phase DC/DC conversion in computing and communications infrastructure-emphasizing thermal efficiency, ripple reduction, and system-level reliability under dynamic load conditions.
FAQ
What is the maximum supported input voltage for the LTC1929CG-PG?
The LTC1929CG-PG supports an absolute maximum input voltage of 36V on the VIN pin, with continuous operation specified from 4V to 36V. This wide input range enables direct integration into 24V industrial buses and telecom -48V-derived intermediate rails without pre-regulation. Exceeding 36V risks permanent damage to internal circuitry including the INTVCC LDO and gate drivers.
Does the LTC1929CG-PG include built-in power-good signaling?
Yes, the LTC1929CG-PG includes a dedicated open-drain PGOOD pin (Pin 15) that asserts low when the EAIN voltage deviates more than ±7.5% from the 0.800V internal reference-corresponding directly to output voltage error. This signal meets standard power sequencing requirements and responds within 10µs of fault detection, providing deterministic system-level fault reporting for the LTC1929CG-PG.
How does the LTC1929CG-PG achieve current sharing between its two phases?
The LTC1929CG-PG achieves inherent current sharing through identical current-mode control architecture per channel, matched current sense thresholds (75mV typical), and synchronized 180° phase offset. Each phase uses separate SENSE1+/– and SENSE2+/– inputs with matched internal comparator offsets, ensuring balanced peak inductor currents without external balun circuits or current-sharing resistors-verified across temperature and load for the LTC1929CG-PG.
Can the LTC1929CG-PG operate in dropout mode, and what is its minimum on-time?
Yes, the LTC1929CG-PG supports very low dropout operation with up to 99.5% duty cycle and includes a dropout detector that forces periodic top-FET off-time to recharge bootstrap capacitors. Its minimum on-time is 180ns (tested with square wave), enabling stable regulation down to VOUT ≈ 0.98 × VIN-critical for high-efficiency point-of-load conversion in the LTC1929CG-PG's target applications.
What is the function of the AMPMD pin on the LTC1929CG-PG?
On the LTC1929CG-PG, the AMPMD pin is internally grounded to configure the VOS+/VOS– operational amplifier as a unity-gain differential amplifier by default. This enables high-common-mode-rejection remote sensing (CMRR ≥55dB) without external resistor networks. Unlike the base LTC1929, the LTC1929CG-PG does not support reconfiguration to uncommitted op-amp mode-the AMPMD function is fixed for differential sensing in this variant.
LTC1929CG-PG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- -
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1929CG-PG#TRPBF FAQ
1.How can I place an order for LTC1929CG-PG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1929CG-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 LTC1929CG-PG#TRPBF reliable?
The price and inventory of LTC1929CG-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 LTC1929CG-PG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1929CG-PG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1929CG-PG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1929CG-PG#TRPBF?
LTC1929CG-PG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1929CG-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 LTC1929CG-PG#TRPBF?
For technical support, including LTC1929CG-PG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1929CG-PG#TRPBF requirements.
6.How does Aetrix verify that LTC1929CG-PG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1929CG-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 LTC1929CG-PG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1929CG-PG#TRPBF?
All LTC1929CG-PG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1929CG-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 LTC1929CG-PG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1929CG-PG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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