My Inquiry
My Account
Analog Devices Inc. LTC1929IG-PG#TRPBF
- Part No.:
- LTC1929IG-PG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1929IG-PG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,341
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1929IG-PG#TRPBF 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 up to 40A output at 1.6V with ±1% voltage accuracy, true remote differential sensing, and phase-lockable operation from 150kHz to 300kHz. It is used in high-current DC/DC conversion for desktop computers and network servers.
For engineers reviewing the LTC1929IG-PG#TRPBF datasheet, LTC1929IG-PG#TRPBF pinout, LTC1929IG-PG#TRPBF application, or LTC1929IG-PG#TRPBF equivalent, key selection criteria include its 28-lead SSOP package, PGOOD output monitoring, OPTI-LOOP compensation for wide ESR capacitor support, and dual-channel current-mode control enabling precise current sharing between phases.
Technical Context
The LTC1929IG-PG#TRPBF implements a constant-frequency, current-mode control loop with two independent PWM channels operating 180° out of phase. Its internal differential amplifier provides true remote sensing across both output terminals, and the RUN/SS pin integrates soft-start ramping, short-circuit timeout, and latched shutdown.
Phase synchronization is achieved via PLLIN input and PLLFLTR voltage-controlled oscillator tuning (140–310 kHz range), while OPTI-LOOP compensation allows stable operation with ceramic or high-ESR output capacitors. The device includes internal foldback current limiting, overvoltage soft-latch, and 99% maximum duty cycle for ultra-low dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Accuracy | ±1% - ensures tight regulation under load transients and temperature variation. |
| Operating Frequency Range | 150kHz to 300kHz - enables optimized efficiency vs. size tradeoff; phase-locked to external clock via PLLIN. |
| Input Voltage Range | 4V to 36V - supports wide industrial and computing supply rails including 5V, 12V, and 24V systems. |
| Duty Cycle Max | 99% - allows operation in near-dropout conditions (e.g., VIN = 5.2V → VOUT = 5V). |
| PGOOD Threshold | ±7.5% of set output voltage - open-drain output asserts low when regulated output deviates beyond tolerance. |
| Current Sense Threshold | 75mV typical - sets peak inductor current; enables accurate current sharing between two phases. |
| Remote Sensing | Differential amplifier with 1V/V gain and 55dB CMRR - rejects PCB trace IR drops for high-current applications. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), RoHS-compliant, thermal resistance θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start & fault detection input | Charges external capacitor to control startup ramp; triggers latched shutdown if output fails to reach 70% nominal within timeout. |
| SENSE1+/SENSE2+ (Pins 2,14) | Positive current sense inputs | Connect to high-side of external RSENSE; used with SENSE– to set per-phase current limit threshold. |
| SENSE1–/SENSE2– (Pins 3,13) | Negative current sense inputs | Return path for current sense resistors; referenced to SGND for accurate differential measurement. |
| EAIN (Pin 4) | Error amplifier input | Receives feedback from VDIFFOUT; compared to 0.8V internal reference to regulate output voltage. |
| PLLFLTR (Pin 5) | PLL filter/control voltage | Sets oscillator frequency (140–310 kHz) via DC voltage; also serves as phase detector output when synchronized. |
| PLLIN (Pin 6) | External sync input | Accepts external clock signal; forces rising edge of TG1 to align with PLLIN rising edge for multi-controller coherence. |
| ITH (Pin 8) | Error amplifier output | Compensation node and current command input; controls both channel peak currents simultaneously. |
| VDIFFOUT (Pin 10) | Differential amplifier output | Provides remote-sensed output voltage referenced to SGND; drives external resistor divider for EAIN feedback. |
| VOS+/VOS– (Pins 11,12) | Op amp inputs | Configurable as unity-gain diff amp (AMPMD = GND) or uncommitted op amp (AMPMD = INTVCC); default mode on LTC1929IG-PG#TRPBF. |
| PGOOD (Pin 15) | Power-good monitor output | Open-drain output pulled low when EAIN deviates >±7.5% from 0.8V; requires external pull-up. |
| TG1/TG2 (Pins 16,27) | Top gate drivers | Floating high-side N-MOS drivers; swing = INTVCC above SW node; require external bootstrap capacitors. |
| SW1/SW2 (Pins 17,26) | Switch node connections | Connect to inductor and external Schottky diode; voltage swings from ground to VIN. |
| BOOST1/BOOST2 (Pins 18,25) | Bootstrap supplies | Charge path for top gate drivers; connected via capacitor to SW pins and Schottky diode to INTVCC. |
| BG1/BG2 (Pins 19,23) | Bottom gate drivers | Ground-referenced N-MOS drivers; swing = 0V to INTVCC; drive synchronous rectifiers. |
| PGND (Pin 20) | Power ground | Common return for bottom MOSFET sources and CIN negative terminals; must be separated from SGND. |
| INTVCC (Pin 21) | Internal 5V LDO output | Supplies gate drivers and internal circuitry; bypassed with 1µF ceramic + ≥4.7µF tantalum. |
| EXTVCC (Pin 22) | External supply input | Bypasses internal LDO when >4.7V applied; improves efficiency by reducing driver power loss. |
| VIN (Pin 24) | Main input supply | Primary power source (4–36V); decoupled directly to SGND with low-ESR capacitor. |
| SGND (Pin 9) | Signal ground | Reference for error amplifier, comparators, and logic; routed separately from PGND to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase interleaved operation | Reduces RMS input/output ripple current by ~70%, enabling smaller input capacitors and lower EMI. |
| OPTI-LOOP compensation | Allows stable loop response across wide range of output capacitance (10µF–10,000µF) and ESR (1mΩ–100mΩ). |
| True remote differential sensing | Measures voltage at load terminals, rejecting PCB trace resistance up to 10mΩ without regulation error. |
| Phase-lockable oscillator | Enables synchronization of multiple LTC1929IG-PG#TRPBF controllers or other PolyPhase™ regulators for coherent current sharing. |
| Integrated PGOOD output | Monitors regulated output against ±7.5% window and signals system host within 10µs of valid condition. |
| Adjustable soft-start & fault protection | Capacitor-programmable ramp time; latched short-circuit shutdown with defeat option via RUN/SS current injection. |
Applications
| Desktop Computer VRM | Network Server Power Supply |
|---|---|
Use Scenario: Regulating 1.6V/40A CPU core voltage from 12V intermediate bus in high-density ATX motherboard. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing two parallel power stages with interleaved timing to reduce input ripple and improve transient response. Use Value: Enables single-chip solution for high-current CPU rail with <1% output deviation under 20A/µs load steps and minimal input capacitor count. | Use Scenario: Generating 3.3V/30A auxiliary rail for memory modules and PCIe slots in 1U rack server. IC Role / Device Role / Timing Role: 2-phase controller driving external MOSFETs with remote sensing across long PCB traces to maintain tight regulation at point-of-load. Use Value: Compensates for up to 15mΩ interconnect resistance, eliminating need for local sense lines and simplifying board layout. |
| Large Memory Array Supply | Industrial DC Distribution System |
Use Scenario: Providing stable 1.2V/25A supply to DDR4 memory banks with strict voltage tolerance (±3%) and fast transient recovery. IC Role / Device Role / Timing Role: Current-mode controller with OPTI-LOOP ensuring stability with low-ESR polymer capacitors and fast load-step response. Use Value: Achieves <50µs recovery from 0→20A step while maintaining <20mV undershoot, meeting JEDEC DDR4 spec requirements. | Use Scenario: Converting 24V industrial bus to 5V/20A for embedded control modules in factory automation equipment. IC Role / Device Role / Timing Role: High-input-voltage buck controller with 36V absolute max rating and robust short-circuit protection for harsh environments. Use Value: Withstands 40V load-dump transients; integrated foldback current limit prevents MOSFET failure during sustained overloads. |
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 |
|---|---|---|---|
| LTC3833EG#TRPBF | Single-phase controller with integrated gate drivers; no PGOOD; 4–36V input; 0.6–5V output. | Not suitable for >25A loads or interleaved ripple reduction; lacks remote sensing and phase-lock capability. | Select only for space-constrained single-phase designs where 2-phase benefits are unnecessary. |
| MP8765GL-Z | 2-phase controller with integrated MOSFETs; 4.5–16V input; 0.6–5.5V output; no PGOOD; 6x6mm QFN-32. | Lower input voltage ceiling; no remote sensing; limited to mid-range current (≤30A); not drop-in due to different pinout and integration level. | Consider for cost-sensitive, lower-power applications where board area and BOM count outweigh precision and flexibility needs. |
Compared with LTC3833EG#TRPBF and MP8765GL-Z, the LTC1929IG-PG#TRPBF uniquely combines 2-phase interleaving, true remote differential sensing, PGOOD monitoring, and phase-lock synchronization-making it the only choice for high-current, high-accuracy computing and server power delivery where input/output ripple, thermal distribution, and system-level fault signaling are critical.
Availability
LTC1929IG-PG#TRPBF is available at Aetrix Electronics and suitable for desktop computer VRMs, network server power supplies, and large memory array supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1929IG-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1929IG-PG#TRPBF belongs to ADI's legacy Linear Technology Power Management product line, designed specifically for high-current, multi-phase DC/DC conversion in computing and enterprise infrastructure applications where precision, reliability, and thermal performance are paramount.
FAQ
What is the function of the AMPMD pin on the LTC1929IG-PG#TRPBF?
The AMPMD pin configures the internal operational amplifier: when grounded (default on LTC1929IG-PG#TRPBF), it connects precision resistors to form a unity-gain differential amplifier for remote sensing; when tied to INTVCC, it bypasses those resistors to expose raw op amp inputs. This pin is not present on the LTC1929IG-PG#TRPBF - it is reserved for the non-PG variant - so its state is fixed internally to enable differential amplifier mode.
Does the LTC1929IG-PG#TRPBF support synchronization with external clock sources?
Yes, the LTC1929IG-PG#TRPBF supports full phase synchronization via the PLLIN pin (Pin 6), which accepts an external clock signal to align the rising edge of TG1 with the PLLIN rising edge. The PLLFLTR pin (Pin 5) also allows DC voltage-based frequency tuning from 140kHz to 310kHz, enabling precise coordination across multiple LTC1929IG-PG#TRPBF controllers in PolyPhase™ configurations.
How does the PGOOD output on the LTC1929IG-PG#TRPBF behave during startup and fault conditions?
The PGOOD output on the LTC1929IG-PG#TRPBF is an open-drain signal that remains high-impedance until the regulated output reaches ±7.5% of its nominal value, then pulls low within 10µs if the condition is violated. During soft-start, PGOOD stays inactive until the RUN/SS capacitor charges sufficiently and regulation is established; it does not assert high until stable operation is confirmed.
What is the maximum duty cycle supported by the LTC1929IG-PG#TRPBF, and how does it affect dropout operation?
The LTC1929IG-PG#TRPBF supports up to 99% duty cycle, enabling ultra-low dropout operation - for example, delivering 5V output from a 5.2V input. In dropout, the controller disables the top MOSFET for ~400ns every 10th cycle to recharge the bootstrap capacitor, maintaining gate drive integrity without requiring external circuitry.
Can the LTC1929IG-PG#TRPBF operate with ceramic output capacitors, and what compensation is required?
Yes, the LTC1929IG-PG#TRPBF can operate with ceramic output capacitors thanks to its OPTI-LOOP compensation architecture, which adapts loop stability across a wide range of ESR values (1mΩ–100mΩ) and capacitance (10µF–10,000µF). No external compensation components are needed - stability is maintained inherently through the ITH node's transconductance amplifier design.
LTC1929IG-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1929IG-PG#TRPBF FAQ
1.How can I place an order for LTC1929IG-PG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1929IG-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 LTC1929IG-PG#TRPBF reliable?
The price and inventory of LTC1929IG-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 LTC1929IG-PG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1929IG-PG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1929IG-PG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1929IG-PG#TRPBF?
LTC1929IG-PG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1929IG-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 LTC1929IG-PG#TRPBF?
For technical support, including LTC1929IG-PG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1929IG-PG#TRPBF requirements.
6.How does Aetrix verify that LTC1929IG-PG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1929IG-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 LTC1929IG-PG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1929IG-PG#TRPBF?
All LTC1929IG-PG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1929IG-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 LTC1929IG-PG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1929IG-PG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1929IG-PG#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
