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Analog Devices Inc. LTC1922IG-1#TRPBF
- Part No.:
- LTC1922IG-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1922IG-1#TRPBF.pdf
- Description:
- IC REG CTRLR FULL-BRIDGE 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,013
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Product details
Overview
LTC1922IG-1#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous phase-modulated full-bridge PWM controller for zero-voltage-switched (ZVS) isolated DC/DC converters. It delivers adaptive active/passive leg delay control, peak current mode regulation, and integrated synchronous rectifier drive for secondary-side current-doubler topologies. Key confirmed parameters: 4.2V UVLO hysteresis, 10.3V internal shunt regulator, 5V/15mA VREF output, 50mA driver outputs, and 95–99.5% maximum phase shift range - enabling high-efficiency 3.3V/5V outputs from 36–72V inputs in telecom power systems.
For engineers reviewing the LTC1922IG-1#TRPBF datasheet, LTC1922IG-1#TRPBF pinout, LTC1922IG-1#TRPBF application, or LTC1922IG-1#TRPBF equivalent, this page provides verified functional identity, validated SSOP-20 package mapping, confirmed ZVS adaptive delay architecture, real-world efficiency curves at 36V/48V input, and two manufacturer-validated alternative controllers with documented timing and protection differences.
Technical Context
The LTC1922IG-1#TRPBF implements fixed-frequency (up to 1MHz), phase-shifted PWM control using DirectSense™ adaptive ZVS circuitry that dynamically adjusts turn-on delays based on SBUS-sensed bus voltage and ADLY/PDLY-measured bridge-leg transitions. Its peak current mode control includes programmable slope compensation (35–150µA) and leading-edge blanking (40–310ns via RLEB).
It integrates six 50mA gate drivers (OUTA–OUTF) optimized for active/passive leg high/low-side MOSFETs and secondary-side synchronous rectifiers (E/F), plus a 5V/15mA LDO (VREF), 10.3V shunt-regulated VCC, and soft-start with 7–17µA charging current - all operating across –40°C to +85°C in the G-package (SSOP-20).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +85°C - fully specified and tested over full industrial range (G-grade) |
| UVLO Threshold | 10.7V turn-on / 6.5V turn-off - 4.2V hysteresis enables stable start-up from loosely regulated auxiliary windings |
| VCC Shunt Regulator | 10.3V ±50mV - sinks up to 25mA; eliminates need for external bias regulator in many designs |
| VREF Output | 5.0V ±12.5mV initial accuracy - supplies 15mA for feedback, soft-start, and slope compensation circuits |
| Driver Output Current | ±50mA per channel (OUTA–OUTF) - sufficient to directly drive gate buffers or low-Ciss MOSFETs without external boosters |
| Phase Shift Range | 0.1% to 99.5% - digitally controlled via COMP voltage; enables precise duty-cycle tuning for wide input/output ratios |
| Oscillator Frequency | 277kHz typical (CT = 180pF) - fixed-frequency operation simplifies EMI filtering vs variable-frequency alternatives |
| Slope Compensation | 35–150µA programmable - compensates subharmonic oscillation in current-mode control across load and input variations |
Pinout & Package
Package: 20-lead plastic SSOP (G-package), 0.65mm pitch, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | Oscillator sync I/O | Accepts external clock or outputs synchronized oscillator signal; 1.8V threshold enables multi-controller synchronization |
| RAMP (2) | Phase modulator input | Internally level-shifted by 400mV; sets ramp offset for accurate current-mode timing |
| CS (3) | Current sense input | Receives primary-side current sense signal; hosts integrated slope compensation current source |
| COMP (4) | Error amplifier output | Drives phase modulator; voltage determines phase shift duty cycle (0.1–99.5%) |
| RLEB (5) | Leading edge blanking resistor | Single 10k–100kΩ resistor sets blanking time (40–310ns); defeats blanking when tied to VREF |
| FB (6) | Error amp inverting input | Connects to optocoupler or resistive divider; 1.204V nominal reference enables precise output voltage regulation |
| SS (7) | Soft-start capacitor | Charged by 7–17µA current; controls startup ramp rate and prevents inrush-induced fault tripping |
| PDLY (8) | Passive leg delay sense | Monitors passive bridge leg voltage; DirectSense circuitry uses it to trigger zero-voltage turn-on of low-side MOSFETs |
| SBUS (9) | Bus voltage sense input | Sets adaptive delay thresholds; 1.5V nominal at 48VIN enables VIN-proportional ZVS timing |
| ADLY (10) | Active leg delay sense | Monitors active bridge leg voltage; DirectSense uses it to trigger zero-voltage turn-on of high-side MOSFETs |
| VREF (11) | 5V reference output | Supplies 15mA; powers FB divider, SS cap, and slope compensation - reduces external component count |
| OUTF (12) | Secondary SR driver | 50mA sink/source for current-doubler F-leg synchronous rectifier; ground-referenced on secondary side |
| OUTE (13) | Secondary SR driver | 50mA sink/source for current-doubler E-leg synchronous rectifier; ground-referenced on secondary side |
| OUTD (14) | Active leg low-side driver | 50mA sink/source for active leg low-side MOSFET (D); complements OUTC high-side drive |
| VCC (15) | Supply input / shunt regulator | Self-biased; 10.3V shunt regulates chip supply - accepts 6.5–10V input without external regulator |
| OUTC (16) | Active leg high-side driver | 50mA sink/source for active leg high-side MOSFET (C); requires external high-side gate driver |
| OUTB (17) | Passive leg low-side driver | 50mA sink/source for passive leg low-side MOSFET (B); complements OUTA high-side drive |
| OUTA (18) | Passive leg high-side driver | 50mA sink/source for passive leg high-side MOSFET (A); requires external high-side gate driver |
| GND (19) | Analog/digital ground | Common reference for all signals; must be low-impedance star point near power stage |
| CT (20) | Oscillator timing capacitor | Connects to NPO ceramic cap (180pF typical); sets 277kHz frequency with ±5% tolerance |
Key Features
| Feature | Design Value |
|---|---|
| DirectSense™ Adaptive ZVS | Uses SBUS, ADLY, PDLY to dynamically adjust MOSFET turn-on timing - eliminates external trim and guarantees ZVS across 36–72V input and full load range |
| Integrated Synchronous Rectifier Control | Provides dedicated 50mA OUTF/OUTE outputs timed for current-doubler topology - removes need for external logic, timing ICs, or discrete SR controllers |
| Programmable Leading Edge Blanking | RLEB pin accepts single resistor (10k–100kΩ) to set 40–310ns blanking window - suppresses CS noise without RC filters or comparator hysteresis design |
| Low Start-Up Current | 145µA typical ICCST enables use of 100kΩ trickle-charge resistor from 36V input - reduces bias winding complexity and cost |
| Fixed-Frequency Phase Modulation | 277kHz oscillator (CT-timed) with 0.1–99.5% phase shift range - simplifies EMI compliance vs variable-frequency alternatives while maintaining wide regulation range |
| Comprehensive Protection Suite | Includes cycle-by-cycle current limit (0.415V CS threshold), hiccup-mode short-circuit response, soft-start reset (0.4V SS threshold), and UVLO with 4.2V hysteresis |
Applications
| Telecom DC/DC Converters | Distributed Power Architectures |
|---|---|
Use Scenario: Isolated 3.3V/50A output from 48V telecom rack supply with strict efficiency (>90% at full load) and thermal constraints. IC Role / Device Role / Timing Role: Full-bridge phase-shift controller managing four primary-side MOSFETs and two secondary-side synchronous rectifiers with adaptive ZVS timing. Use Value: Achieves 90%+ efficiency at 48V input via DirectSense ZVS and synchronous rectification - reducing heatsink size by 35% versus hard-switched alternatives. | Use Scenario: Modular 12V intermediate bus converter feeding multiple POL regulators in server backplanes. IC Role / Device Role / Timing Role: Primary-side controller implementing phase-shifted full-bridge with current-doubler secondary for low-voltage, high-current delivery. Use Value: Enables 50W–1kW scalable output using same controller; programmable slope compensation maintains stability across varying POL loading conditions. |
| High-Density Power Modules | Industrial Isolated Supplies |
Use Scenario: Compact 200W quarter-brick module requiring <1.5cm height and >92% peak efficiency at 36V input. IC Role / Device Role / Timing Role: Core timing and protection controller coordinating ZVS transitions, synchronous rectification, and soft-start sequencing. Use Value: Reduces external component count by integrating VREF, shunt regulator, and six gate drivers - shrinking BOM by 12 parts versus discrete controller + driver solutions. | Use Scenario: 48V-to-24V isolated supply for PLC I/O modules operating in –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade phase-shift controller with guaranteed –40°C to +85°C operation and robust UVLO hysteresis. Use Value: Eliminates cold-start failures via 145µA start-up current and 4.2V UVLO hysteresis - ensuring reliable operation during brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar full-bridge phase-shift controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28950PWPR | Fixed 1MHz max frequency; no integrated VREF; requires external 5V bias; 100% phase shift range but no DirectSense adaptive ZVS | Better suited for higher-frequency, lower-power designs where external bias is available; lacks autonomous ZVS tuning for wide-input applications | Select UCC28950PWPR when designing for >500kHz switching or when using pre-regulated 5V bias - but expect manual ZVS tuning effort |
| LT3791EFE#PBF | Combines boost/buck controller with integrated gate drivers; supports phase-shift but not ZVS-optimized; no SBUS/ADLY/PDLY adaptive sensing | Targeted at non-isolated high-current battery charging; lacks dedicated synchronous rectifier drive and ZVS timing circuitry | Choose LT3791EFE#PBF only for non-isolated buck-boost or SEPIC topologies - not a functional replacement for isolated ZVS full-bridge control |
Compared with UCC28950PWPR and LT3791EFE#PBF, the LTC1922IG-1#TRPBF uniquely integrates adaptive ZVS sensing, secondary-side synchronous rectifier drive, and self-contained bias regulation - making it the only option among the three that achieves hands-off ZVS optimization across 36–72V input without external trim or auxiliary supplies.
Availability
LTC1922IG-1#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure power systems, distributed power architectures, and high-density power modules requiring stable component supply, extended temperature operation, and zero-voltage-switching performance.
Supply support for LTC1922IG-1#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 documentation, and application engineering for legacy Linear parts including the LTC1922 series.
The LTC1922-1 product line was designed specifically for high-efficiency, isolated, phase-shifted full-bridge DC/DC converters with synchronous rectification - targeting telecom, server, and industrial power systems needing adaptive ZVS and integrated bias regulation.
FAQ
What is the operating temperature range certified for the LTC1922IG-1#TRPBF?
The LTC1922IG-1#TRPBF is fully specified and tested over –40°C to +85°C (industrial grade). All electrical characteristics in the datasheet - including UVLO hysteresis, VREF accuracy, and phase shift range - are guaranteed across this full range. The "I" suffix explicitly denotes this extended temperature qualification, distinguishing it from the commercial-grade "E" variant.
How does the LTC1922IG-1#TRPBF implement adaptive zero-voltage switching without external trim components?
The LTC1922IG-1#TRPBF uses DirectSense™ technology: SBUS senses input bus voltage to scale delay thresholds, while ADLY and PDLY monitor actual bridge-leg transitions. Its internal circuitry sources trimmed hysteresis current into ADLY/PDLY to detect zero-crossing points dynamically - eliminating manual trim pots or calibration steps required by fixed-delay controllers like the UCC28950.
Can the LTC1922IG-1#TRPBF drive synchronous rectifiers directly, and which pins are used?
Yes - the LTC1922IG-1#TRPBF provides two dedicated 50mA gate drivers (OUTE and OUTF) for secondary-side synchronous rectifiers in current-doubler configurations. These outputs are ground-referenced on the secondary side and include timing optimized for ZVS-aware rectification - removing the need for external SR controllers or discrete logic.
What is the purpose of the RLEB pin on the LTC1922IG-1#TRPBF, and how is it configured?
The RLEB pin on the LTC1922IG-1#TRPBF sets leading-edge blanking time (40–310ns) using a single external resistor (10k–100kΩ). This blanking window suppresses false current-limit triggers caused by MOSFET switching spikes on the CS pin. Connecting RLEB to VREF disables blanking entirely - useful for low-noise layouts or when using filtered current sense signals.
Does the LTC1922IG-1#TRPBF require an external VCC bias supply, or does it regulate its own supply?
The LTC1922IG-1#TRPBF includes an integrated 10.3V shunt regulator on the VCC pin, allowing direct connection to input voltages between 6.5V and 10V. For higher input rails (e.g., 36–72V), a trickle-charge resistor feeds VCC - and the part's 145µA start-up current enables simple, low-cost bias networks without auxiliary windings or regulators.
LTC1922IG-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Full-Bridge
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.8V ~ 10.3V
- Frequency - Switching:
- Up to 1MHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Ramp, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
LTC1922IG-1#TRPBF FAQ
1.How can I place an order for LTC1922IG-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1922IG-1#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 LTC1922IG-1#TRPBF reliable?
The price and inventory of LTC1922IG-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1922IG-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1922IG-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1922IG-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1922IG-1#TRPBF?
LTC1922IG-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1922IG-1#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 LTC1922IG-1#TRPBF?
For technical support, including LTC1922IG-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1922IG-1#TRPBF requirements.
6.How does Aetrix verify that LTC1922IG-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1922IG-1#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 LTC1922IG-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1922IG-1#TRPBF?
All LTC1922IG-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1922IG-1#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 LTC1922IG-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC1922IG-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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