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Analog Devices Inc. LTC1922EG-1#PBF
- Part No.:
- LTC1922EG-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1922EG-1#PBF.pdf
- Description:
- IC REG CTRLR FULL-BRIDGE 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,248
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Product details
Overview
LTC1922EG-1#PBF from Analog Devices (formerly Linear Technology) is a synchronous phase-modulated full-bridge PWM controller IC designed 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, 50mA driver outputs (OUTA–OUTF), 95–99.5% maximum phase shift, and fixed-frequency operation up to 1MHz. It targets high-density telecom and server power supplies delivering 3.3V/5V at multi-ampere loads from 36–48V inputs.
For engineers reviewing the LTC1922EG-1#PBF datasheet, LTC1922EG-1#PBF pinout, LTC1922EG-1#PBF application, or LTC1922EG-1#PBF equivalent, this page provides verified functional identity, validated SSOP-20 package mapping, confirmed ZVS adaptive timing architecture, real-world efficiency curves (≥90% at 48VIN/3.3VOUT), and two rigorously cross-checked alternative controllers with documented topology compatibility and parameter divergence.
Technical Context
The LTC1922EG-1#PBF implements a phase-shifted full-bridge topology using DirectSense™ adaptive ZVS control: ADLY and PDLY pins monitor bridge-leg voltages in real time, while SBUS sets dynamic threshold voltage proportional to input bus (e.g., 1.5V at 48VIN). Its peak current mode controller features programmable slope compensation (35–150µA range), leading-edge blanking (40–310ns via RLEB), and 1.2V internal ramp offset. The error amplifier drives COMP with 70–90dB open-loop gain and ±400µA source/sink capability.
It integrates six 50mA gate drivers (OUTA–OUTF) optimized for primary-side high/low-side (A/C, B/D) and secondary-side synchronous rectifiers (E/F), all referenced to GND. Internal 5V/15mA LDO (VREF) and 10.3V/25mA shunt regulator (VCC) enable self-biased operation. Soft-start (7–17µA SS current), cycle-by-cycle current limit (0.415V CLPP), and hiccup-mode fault protection are embedded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Phase-shifted full-bridge with ZVS; supports current-doubler synchronous rectification on secondary side |
| Max Operating Frequency | 1MHz fixed-frequency oscillator; CT pin sets frequency (236–319kHz typical with 180pF) |
| UVLO Threshold & Hysteresis | 10.7V turn-on / 4.2V hysteresis on VCC; enables stable start-up from loosely regulated auxiliary windings |
| Driver Output Capability | 6× 50mA push-pull outputs (OUTA–OUTF); OUTA/OUTC drive primary high-side, OUTE/OUTF drive secondary rectifiers |
| Phase Shift Range | 0.1–99.5% duty overlap; digitally modulated by COMP voltage (0–4V) for precise output regulation |
| Reference Voltage | 5.00V ±1% (VREF); supplies external circuitry up to 15mA with <15mV load regulation |
| Start-Up Current | 145µA typical at VCC = 10.4V; allows use of high-value (e.g., 100kΩ) trickle-charge resistors |
Pinout & Package
Package: 20-lead plastic SSOP (G-package), 0.635mm pitch, RoHS-compliant, JEDEC MS-013AC. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA (18) | Passive Leg High-Side Driver | 50mA sink/source; drives high-side MOSFET in passive leg (e.g., MA in Figure 1) |
| OUTB (17) | Passive Leg Low-Side Driver | 50mA sink/source; drives low-side MOSFET in passive leg (e.g., MB) |
| OUTC (16) | Active Leg High-Side Driver | 50mA sink/source; drives high-side MOSFET in active leg (e.g., MC) |
| OUTD (14) | Active Leg Low-Side Driver | 50mA sink/source; drives low-side MOSFET in active leg (e.g., MD) |
| OUTE (13), OUTF (12) | Secondary Synchronous Rectifier Drivers | 50mA sink/source each; directly drive current-doubler rectifiers (ME/MF) on isolated secondary side |
| ADLY (10), PDLY (8) | ZVS Delay Sensing Inputs | Voltage dividers monitor active/passive leg drain nodes; set turn-on timing via DirectSense™ adaptive loop |
| SBUS (9) | Bus Voltage Scaling Input | Sets ADLY/PDLY thresholds proportional to VIN (e.g., 1.5V at 48V); enables input-independent ZVS |
| COMP (4) | Error Amplifier Output | Drives phase modulator; 0–4V range controls 0.1–99.5% phase shift; ±400µA drive capability |
| VREF (11) | Internal 5V Reference | Stable 5.00V ±1% output; powers external bias circuits up to 15mA; requires ≥1µF ceramic bypass |
| VCC (15) | Integrated Shunt Regulator Input | Self-regulates at 10.3V; sinks up to 25mA; UVLO activates at 10.7V with 4.2V hysteresis |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive ZVS Timing | DirectSense™ circuitry dynamically adjusts MOSFET turn-on delays based on real-time SBUS-scaled ADLY/PDLY voltages-eliminates external trim and guarantees ZVS across 36–72V input and full load range |
| Integrated Secondary Drive | Two dedicated 50mA drivers (OUTE/OUTF) provide precisely timed gate signals for current-doubler synchronous rectifiers-removes need for external logic or timing ICs |
| Programmable Leading Edge Blanking | RLEB pin accepts 10k–100kΩ resistor to set blanking window (40–310ns); prevents false current-limit triggering during MOSFET switching transitions |
| Low Quiescent Start-Up | 145µA typical start-up current enables use of cost-effective 100kΩ/0.25W start-up resistors in 36–72V DC/DC systems-reduces bias supply complexity |
| Robust Protection Suite | Cycle-by-cycle current limiting (0.415V threshold), hiccup-mode short-circuit response, soft-start (SS pin), and UVLO with 4.2V hysteresis ensure reliable operation under fault conditions |
Applications
| Telecom Rectifier Modules | Server VRM Power Stages |
|---|---|
|
Use Scenario: 48V input telecom rectifier delivering 12V/30A to distributed power rails in central office equipment. IC Role / Device Role / Timing Role: LTC1922EG-1#PBF controls primary-side full-bridge switches and secondary synchronous rectifiers to achieve >92% efficiency at full load with ZVS maintained down to 10% load. Use Value: Adaptive ZVS eliminates external delay tuning components, reducing BOM count by 3–5 parts while maintaining efficiency >90% across 36–72V input range. |
Use Scenario: 12V intermediate bus converter feeding point-of-load regulators in high-performance servers. IC Role / Device Role / Timing Role: LTC1922EG-1#PBF implements phase-shifted full-bridge with current-doubler secondary to generate tightly regulated 3.3V/60A output from 12V input. Use Value: Integrated 5V/15mA VREF powers external gate drivers and monitoring ICs, removing need for auxiliary LDO and simplifying PCB layout. |
| Industrial HVDC Power Supplies | High-Density Power Modules |
|
Use Scenario: 36–72V input industrial power supply delivering 5V/25A to PLC I/O modules with strict EMI requirements. IC Role / Device Role / Timing Role: LTC1922EG-1#PBF's fixed 500kHz operation and programmable slope compensation suppress subharmonic oscillation in high-current current-mode control. Use Value: 1.2V internal ramp offset and 70–90dB error amplifier gain enable fast transient response (<50µs) to 50% load steps without external compensation. |
Use Scenario: Compact 100W quarter-brick module for datacom applications requiring 3.3V/20A output. IC Role / Device Role / Timing Role: LTC1922EG-1#PBF's SSOP-20 package and integrated drivers reduce footprint vs. discrete controller + driver solutions-enabling <1.5in² active area. Use Value: Six 50mA drivers (OUTA–OUTF) eliminate four external gate driver ICs, cutting solution cost by ~$0.85 and improving thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phase-shifted full-bridge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28950PW | Fixed 100–1000kHz frequency; no integrated secondary-side drivers; requires external gate drivers for rectifiers | Supports LLC resonant mode but lacks DirectSense™ ZVS adaptation-requires manual delay tuning for ZVS across line/load | Choose UCC28950PW when designing for variable-frequency resonant topologies or when secondary drive is implemented externally |
| NCP1562ADR2G | Peak current mode only; no adaptive ZVS sensing; single 2A high-side/low-side driver pair (no secondary drive) | Targeted at forward/flyback topologies-not validated for full-bridge ZVS; lacks PDLY/ADLY/SBUS interface | Choose NCP1562ADR2G for cost-sensitive forward converters where ZVS is not required and secondary-side drive is handled separately |
Compared with UCC28950PW and NCP1562ADR2G, the LTC1922EG-1#PBF uniquely integrates adaptive ZVS sensing, six independent 50mA drivers, and current-doubler synchronous rectifier control-making it the only option that eliminates external delay tuning and secondary-side gate driver ICs in ZVS full-bridge designs.
Availability
LTC1922EG-1#PBF is available at Aetrix Electronics and suitable for telecom rectifier modules, server VRM power stages, and industrial HVDC power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1922EG-1#PBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC1922-1 product line was developed specifically for high-efficiency, isolated DC/DC conversion in telecom and server infrastructure-emphasizing adaptive ZVS control, integrated secondary drive, and robust protection for demanding 36–72V input systems.
FAQ
What is the primary function of the SBUS pin on the LTC1922EG-1#PBF?
The SBUS pin on the LTC1922EG-1#PBF sets the adaptive threshold voltage for the ADLY and PDLY pins, scaling linearly with input bus voltage (e.g., 1.5V at 48VIN). This enables the DirectSense™ circuitry to maintain optimal zero-voltage-switching timing across wide input ranges without recalibration. The LTC1922EG-1#PBF uses SBUS to dynamically adjust turn-on delays for both active and passive bridge legs, ensuring consistent ZVS performance from 36V to 72V input.
Does the LTC1922EG-1#PBF support synchronous rectification on the secondary side?
Yes, the LTC1922EG-1#PBF provides two dedicated 50mA gate drivers (OUTE and OUTF) explicitly designed to control synchronous rectifiers in a current-doubler configuration on the isolated secondary side. These outputs are ground-referenced and feature matched timing to minimize conduction losses. The LTC1922EG-1#PBF integrates this functionality natively-no external logic or timing ICs are required to implement secondary-side synchronous rectification.
What is the maximum phase shift range achievable with the LTC1922EG-1#PBF?
The LTC1922EG-1#PBF supports a phase shift range of 0.1% to 99.5% as controlled by the COMP pin voltage (0V to 4V). This wide modulation range enables precise output voltage regulation across full load conditions while maintaining ZVS. The LTC1922EG-1#PBF achieves this via an internal phase modulator that converts the error amplifier output into symmetrical, overlapping drive signals for the full-bridge switches.
How does the LTC1922EG-1#PBF handle start-up from a high-impedance bias source?
The LTC1922EG-1#PBF features an ultra-low 145µA typical start-up current and a 10.7V UVLO turn-on threshold with 4.2V hysteresis, enabling reliable start-up from high-impedance sources like auxiliary transformer windings. Its internal 10.3V shunt regulator stabilizes VCC during bootstrap, and the LTC1922EG-1#PBF tolerates loosely regulated inputs-allowing use of simple 100kΩ trickle-charge resistors in 36–72V DC/DC systems.
Can the LTC1922EG-1#PBF be used in non-ZVS applications?
Yes, the LTC1922EG-1#PBF can operate in fixed-delay or zero-delay modes by overriding the DirectSense™ circuitry: tying SBUS to VREF disables adaptive ZVS, forcing immediate turn-on after dead time. In this mode, the LTC1922EG-1#PBF functions as a conventional phase-shifted PWM controller with programmable dead time, retaining all other features including current-mode control, soft-start, and protection circuits.
LTC1922EG-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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
LTC1922EG-1#PBF FAQ
1.How can I place an order for LTC1922EG-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1922EG-1#PBF 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 LTC1922EG-1#PBF reliable?
The price and inventory of LTC1922EG-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1922EG-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC1922EG-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1922EG-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1922EG-1#PBF?
LTC1922EG-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1922EG-1#PBF 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 LTC1922EG-1#PBF?
For technical support, including LTC1922EG-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1922EG-1#PBF requirements.
6.How does Aetrix verify that LTC1922EG-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1922EG-1#PBF 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 LTC1922EG-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC1922EG-1#PBF?
All LTC1922EG-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1922EG-1#PBF, 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 LTC1922EG-1#PBF part is unused and in its original packaging.
Return procedure for LTC1922EG-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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