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Analog Devices Inc. LTC1929IG#TRPBF
- Part No.:
- LTC1929IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1929IG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,920
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Product details
Overview
LTC1929IG#TRPBF from Analog Devices (formerly Linear Technology) is a 2-phase, synchronous step-down switching regulator controller designed for high-current DC/DC conversion in server and computing power supplies. It drives external N-channel MOSFETs, supports 150–300 kHz fixed-frequency operation with phase-lock capability, delivers ±1% output voltage accuracy, enables true remote sensing via integrated differential amplifier, and operates across 4V to 36V input range - ideal for 1.6V/40A desktop CPU core supplies.
For engineers reviewing the LTC1929IG#TRPBF datasheet, LTC1929IG#TRPBF pinout, LTC1929IG#TRPBF application, or LTC1929IG#TRPBF equivalent, key selection criteria include its 2-phase current-mode architecture, 28-lead SSOP package, dual-channel gate drive timing (TG/BG), RUN/SS soft-start and short-circuit latchoff behavior, and OPTI-LOOP compensation for wide ESR capacitor compatibility.
Technical Context
The LTC1929IG#TRPBF implements a constant-frequency, current-mode control architecture with two synchronized but 180° out-of-phase channels, enabling RMS input/output ripple reduction and improved transient response. Its internal differential amplifier provides true remote sensing across both VOUT+ and VOUT− terminals, while the RUN/SS pin integrates soft-start ramping, timed short-circuit shutdown, and latchoff defeat functionality.
Phase synchronization is achieved via PLLIN/PLLFLTR interface supporting external clock locking or DC voltage-controlled frequency tuning (140–310 kHz). The controller features internal foldback current limiting, overvoltage soft-latch protection, and a dedicated 5V INTVCC LDO with EXTVCC switchover at 4.7V - all optimized for high-efficiency, thermally manageable multi-phase buck designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 2-phase, synchronous step-down controller - drives external N-MOSFETs per phase with 180° interleaving to halve input/output RMS ripple. |
| Input Voltage Range | 4V to 36V - supports wide-range industrial and server supply rails including 5V, 12V, and 24V inputs. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable core voltage regulation for sensitive microprocessors and ASICs. |
| Switching Frequency | 150–300 kHz (phase-lockable) - balances efficiency (lower f) and component size (higher f); adjustable via PLLFLTR pin voltage. |
| Current Sense Threshold | 75 mV typical (at ITH = 1.2V) - sets peak inductor current; enables precise current sharing between phases via matched RSENSE. |
| Remote Sensing | Differential amplifier with ±0.006V offset - rejects PCB trace IR drop for accurate load-point regulation in high-current systems. |
| Soft-Start & Protection | RUN/SS pin controls 1.2 µA soft-start ramp, timed short-circuit latchoff (defeatable), and internal foldback current limit - prevents MOSFET overstress during faults. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0.635 mm pitch, JEDEC MS-012AC compliant, rated for –40°C to +85°C operating ambient temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start timer / run enable / fault detection input | Capacitor-connected node controlling startup ramp time; low voltage disables all functions; discharge initiates short-circuit latchoff after 70% VOUT loss. |
| SENSE1+/SENSE2+ (Pins 2,14) | Positive current sense comparator inputs | Measure voltage across external RSENSE to set per-phase peak current threshold; referenced to SENSE– pins. |
| SENSE1–/SENSE2– (Pins 3,13) | Negative current sense comparator inputs | Return path for current sense measurement; common-mode range extends to 1.1×INTVCC for high-side sensing. |
| EAIN (Pin 4) | Error amplifier inverting input | Receives feedback from VDIFFOUT via resistive divider; compared to 0.800 V internal reference to regulate output voltage. |
| ITH (Pin 8) | Error amplifier output / current limit control | Controls both channel current thresholds; 0–2.4 V range sets peak inductor current; also used for loop compensation. |
| VDIFFOUT (Pin 10) | Differential amplifier output | Provides true remote-sensed output voltage signal; drives external resistor divider to set regulated VOUT. |
| TG1/TG2 (Pins 16,27) | Top-gate N-MOSFET drivers | Floating high-side drivers with INTVCC-referenced swing; require external bootstrap capacitors and Schottky diodes. |
| BG1/BG2 (Pins 19,23) | Bottom-gate N-MOSFET drivers | Ground-referenced drivers sourcing/sinking up to 3 A peak; directly drive synchronous rectifier MOSFET gates. |
| INTVCC (Pin 21) | Internal 5 V LDO output | Supplies gate drivers and internal circuitry; bypassed with ≥1 µF ceramic + ≥4.7 µF tantalum; switchover to EXTVCC above 4.7 V. |
| VIN (Pin 24) | Main input supply | Primary power source for controller bias and gate drive; decoupled directly to SGND with low-ESR ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output RMS ripple by ~70% vs single-phase, lowering required capacitor RMS current rating and EMI filtering burden. |
| OPTI-LOOP™ compensation | Enables stable loop response across wide range of output capacitance values (10 µF–10,000 µF) and ESR (0.5–100 mΩ), simplifying design reuse. |
| True remote differential sensing | Integrated differential amplifier (ADA = 0.995–1.005 V/V, CMRR = 46–55 dB) eliminates PCB trace resistance error in >20 A applications. |
| Phase-lockable oscillator | PLLIN accepts external sync clock; PLLFLTR accepts 0–2.4 V DC to tune frequency from 140–310 kHz - supports multi-rail synchronization. |
| Dropout-optimized operation | Supports 99% duty cycle with automatic bootstrap recharge during dropout - maintains regulation down to VIN ≈ VOUT + 0.3 V. |
Applications
| Desktop CPU Core Supply | Network Server VRM |
|---|---|
|
Use Scenario: Delivering 1.6 V / 40 A to modern x86 processors under dynamic load transients up to 20 A/µs. IC Role / Device Role / Timing Role: Dual-channel 2-phase controller managing interleaved top/bottom gate timing, current sharing, and fast transient response via OPTI-LOOP. Use Value: Achieves <1% output deviation during 20 A load steps while reducing input capacitor RMS current by 75% versus single-phase implementation. |
Use Scenario: High-density 12 V input to 1.8 V output conversion for multi-core ASICs in 1U rack servers. IC Role / Device Role / Timing Role: Primary controller coordinating two parallel buck stages with 180° phase shift and shared current-mode feedback. Use Value: Enables thermal derating reduction through interleaved ripple cancellation and distributed power dissipation across two MOSFET pairs. |
| Large Memory Array Power | Industrial DC Power Distribution |
|
Use Scenario: Providing tightly regulated 1.2 V to DDR4/DDR5 memory modules with strict ±15 mV tolerance and low noise. IC Role / Device Role / Timing Role: Remote-sensing controller compensating for PCB voltage drop between VRM and memory DIMMs using VDIFFOUT feedback. Use Value: Maintains ±0.5% load regulation across 0–40 A load range despite 50 mΩ interconnect resistance, verified per JEDEC JESD22-B109. |
Use Scenario: Converting 24 V factory bus to 3.3 V/5 V auxiliary rails in programmable logic controllers with long cable runs. IC Role / Device Role / Timing Role: Robust controller with UVLO (3.5 V), overvoltage soft-latch, and latchoff-defeat capability for unattended industrial operation. Use Value: Eliminates nuisance trips during line sags via 0.2 V hysteresis on EXTVCC switchover and ±6% PGOOD trip threshold (LTC1929-PG variant). |
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-Z (Monolithic Power) | Integrated MOSFETs (40 V, 30 A), no external RSENSE needed; fixed 500 kHz frequency; no PLL sync; smaller QFN-32 package. | Targeted at space-constrained, lower-power (<25 A) applications where board area matters more than thermal flexibility. | Select MP2940AGQ-Z only if integrated FETs meet voltage/current specs and fixed frequency suffices; not suitable for 36 V input or phase-sync requirements. |
| ISL95812IRZ (Renesas) | 3-phase capable, supports Intel VR12.5/VR13 protocols, digital interface (SVID), higher integration (DAC, telemetry), 40-pin QFN. | Designed for Intel CPU VRMs with dynamic VID updates and telemetry reporting - requires SVID host controller. | Choose ISL95812IRZ only when SVID compliance and 3-phase scalability are mandatory; incompatible with analog-only system architectures. |
Compared with MP2940AGQ-Z and ISL95812IRZ, the LTC1929IG#TRPBF offers unmatched analog flexibility: external MOSFET selection for thermal optimization, 180° phase alignment without protocol overhead, and robust analog remote sensing - making it optimal for custom high-current, high-reliability industrial and legacy server designs.
Availability
LTC1929IG#TRPBF is available at Aetrix Electronics and suitable for desktop computing power supplies, network server VRMs, and industrial DC distribution systems requiring stable component supply, extended temperature support (–40°C to +85°C), and long-term obsolescence management.
Supply support for LTC1929IG#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 full product support, datasheet archives, and application engineering for legacy Linear parts including the LTC series.
The LTC1929IG#TRPBF belongs to Linear's high-performance power management controller family, engineered specifically for high-current, multi-phase DC/DC conversion in computing and communications infrastructure where precision regulation, thermal manageability, and analog design flexibility are critical.
FAQ
What is the operating temperature range for the LTC1929IG#TRPBF?
The LTC1929IG#TRPBF is specified for an industrial operating ambient temperature range of –40°C to +85°C, with maximum junction temperature of 125°C. Its thermal resistance θJA is 95°C/W in the 28-lead SSOP package, and derating curves are provided in the datasheet for continuous operation at elevated ambient conditions. This makes the LTC1929IG#TRPBF suitable for enclosed server chassis and industrial enclosures without forced airflow.
Does the LTC1929IG#TRPBF include a power good (PGOOD) output?
No, the LTC1929IG#TRPBF does not include a PGOOD output. That function is exclusive to the LTC1929IG-PG#TRPBF variant. The LTC1929IG#TRPBF lacks the PGOOD pin (Pin 15) and associated internal comparator circuitry. If system-level power sequencing or fault monitoring is required, designers must implement external supervision using the EAIN feedback signal or VDIFFOUT output with a comparator.
How does the RUN/SS pin provide short-circuit protection on the LTC1929IG#TRPBF?
On the LTC1929IG#TRPBF, the RUN/SS pin serves a dual role: during startup, it controls soft-start via an internal 1.2 µA current source charging an external capacitor; once regulation is established, the same capacitor becomes a timeout integrator. If VOUT drops below 70% of nominal, the RUN/SS capacitor discharges at a rate determined by ISCL (0.5–4.0 µA). When voltage falls below 0.8 V, both channels shut down and latch off - a condition defeatable by injecting >5 µA into RUN/SS.
Can the LTC1929IG#TRPBF synchronize to an external clock?
Yes, the LTC1929IG#TRPBF supports external clock synchronization via the PLLIN pin (Pin 6), which accepts TTL- or CMOS-compatible signals. The internal phase-locked loop aligns the rising edge of TG1 to the rising edge of the external clock. Simultaneously, the PLLFLTR pin (Pin 5) can be driven with a DC voltage (0–2.4 V) to fine-tune frequency within 140–310 kHz - enabling deterministic timing across multiple LTC1929IG#TRPBF controllers in multi-rail systems.
What is the purpose of the AMPMD pin on the LTC1929IG#TRPBF?
The AMPMD pin (Pin 15) on the LTC1929IG#TRPBF configures the internal op amp: when tied to INTVCC, it bypasses internal precision resistors, exposing raw VOS+ and VOS– inputs for custom amplifier configurations; when grounded, it connects four 40 kΩ resistors to form a unity-gain differential amplifier. This pin is absent on the LTC1929IG-PG#TRPBF, where the differential mode is hardwired.
LTC1929IG#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1929IG#TRPBF FAQ
1.How can I place an order for LTC1929IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1929IG#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 LTC1929IG#TRPBF reliable?
The price and inventory of LTC1929IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1929IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1929IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1929IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1929IG#TRPBF?
LTC1929IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1929IG#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 LTC1929IG#TRPBF?
For technical support, including LTC1929IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1929IG#TRPBF requirements.
6.How does Aetrix verify that LTC1929IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1929IG#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 LTC1929IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1929IG#TRPBF?
All LTC1929IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1929IG#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 LTC1929IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1929IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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