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Analog Devices Inc. LTC3722IGN-1#PBF
- Part No.:
- LTC3722IGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3722IGN-1#PBF.pdf
- Description:
- IC REG CTRLR FULL-BRIDGE 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:797
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Product details
Overview
LTC3722IGN-1#PBF from Analog Devices is a peak current mode, phase-shift PWM controller for zero-voltage-switched (ZVS) full-bridge DC/DC converters. It delivers adaptive ZVS delay control, programmable slope compensation, and 50mA synchronous rectifier drivers - enabling high-efficiency telecom and server power supplies operating from 36V–72V input with 12V/240W output capability.
For engineers reviewing the LTC3722IGN-1#PBF datasheet, LTC3722IGN-1#PBF pinout, LTC3722IGN-1#PBF application, or LTC3722IGN-1#PBF equivalent, this controller supports precise ZVS timing calibration, dual-mode (adaptive/fixed) delay configuration, and integrated 5V reference with ±1% accuracy - critical for stable high-power isolated converter design.
Technical Context
The LTC3722IGN-1#PBF implements peak current mode control with programmable slope compensation and leading edge blanking (40–310ns via RLEB), ensuring stability across wide load and line variations. Its adaptive ZVS circuitry independently delays each MOSFET turn-on using SBUS, ADLY, and PDLY inputs to sense bridge leg voltage transitions.
It features a 24-pin SSOP package with six 50mA gate drivers (OUTA–OUTF), internal 10.25V VCC UVLO with 4.2V hysteresis, and a 5V ±1% VREF output capable of sourcing 18mA - all optimized for interfacing with external gate drivers like LTC4440 and LTC3901 in full-bridge topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 250kHz typical (225–275kHz initial accuracy); sets base switching frequency for full-bridge operation. |
| VREF Accuracy | ±1% over temperature (4.925–5.075V); enables precise external biasing and feedback scaling. |
| Max Phase Shift | 98.5% at COMP = 4.5V; allows fine-grained duty cycle control for ZVS optimization across load range. |
| Start-Up Current | 145µA max (–40°C to 85°C); ensures reliable startup under low-VIN conditions without auxiliary supply. |
| Output Driver Sink/Source | 50mA sink/source per OUTx; directly drives high-side gate drivers or buffers without external amplification. |
| FB Regulation Voltage | 1.204V ±3mV; defines precise error amplifier setpoint for secondary-side voltage regulation. |
| UVLO Threshold | 5.0V system UVLO with programmable hysteresis; provides accurate, resistor-set turn-on/turn-off for input rail sequencing. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN), –40°C to 85°C junction temperature rating, θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA, OUTC, OUTD, OUTB | Full-bridge gate drive outputs | Four 50mA drivers for high/low side active/passive legs; OUTA/OUTC = high-side, OUTB/OUTD = low-side. |
| OUTE, OUTF | Synchronous rectifier drivers | 50mA ground-referenced outputs for secondary-side synchronous FETs; timed via SPRG resistor. |
| ADLY, PDLY, SBUS | ZVS sensing & delay programming | Enable adaptive ZVS by monitoring bridge leg voltages; support fixed-delay mode when SBUS = VREF. |
| CS, RLEB, COMP, FB | Current sensing & control loop | CS accepts current-sense signal; RLEB sets blanking time; COMP is error amp output; FB sets 1.204V regulation point. |
| VREF, UVLO, CT, SS | Reference, sequencing & timing | VREF = 5V ±1% reference; UVLO programs system turn-on; CT sets oscillator frequency; SS controls soft-start ramp. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive ZVS with timeout | DirectSense™ technology eliminates external trim components and maintains ZVS across full load range using SBUS/ADLY/PDLY feedback. |
| Programmable synchronous rectifier timing | SPRG resistor sets turn-off delay for OUTE/OUTF, optimizing secondary-side FET conduction overlap and reducing body diode losses. |
| Integrated 5V reference + LDO | VREF supplies up to 18mA with ±1% accuracy and <15mV load regulation - powers external circuits without discrete regulators. |
| Leading edge blanking (LEB) | RLEB resistor (10k–100kΩ) programs 40–310ns blanking window on CS pin, preventing false current-limit triggering during switching transients. |
| Low quiescent current | 145µA start-up and 5–8mA operating current enable high-efficiency standby and light-load performance in telecom systems. |
Applications
| Telecom Rectifier Modules | Server PSU Front-End |
|---|---|
Use Scenario: 48V input to 12V/20A isolated DC/DC conversion in distributed power architecture. IC Role / Device Role / Timing Role: Primary-side phase-shift PWM controller managing ZVS transitions and synchronous rectification timing. Use Value: Achieves >95% efficiency at full load by eliminating hard-switching losses and minimizing dead-time conduction loss. |
Use Scenario: High-density 72V input server power supply delivering 12V/240W with tight thermal constraints. IC Role / Device Role / Timing Role: Full-bridge controller with adaptive ZVS and programmable slope compensation for stable current-mode operation. Use Value: Enables compact transformer design and reduces EMI through controlled soft-switching transitions across 10–100% load range. |
| Industrial 48V DC Distribution | Base Station Power Conversion |
Use Scenario: Isolated 48V-to-12V conversion for industrial PLC I/O modules requiring high reliability. IC Role / Device Role / Timing Role: Controller implementing fixed-delay ZVS mode (SBUS = VREF) for simplified secondary-side control integration. Use Value: Eliminates need for external ZVS timing ICs and reduces BOM count while maintaining >93% efficiency at 25% load. |
Use Scenario: 36–72V telecom rectifier feeding RF power amplifiers with strict ripple and transient response requirements. IC Role / Device Role / Timing Role: Peak current mode controller with programmable soft-start and hiccup-mode short-circuit protection. Use Value: Ensures safe startup into capacitive loads and recovers automatically from output shorts without manual reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar full-bridge phase-shift PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28950PWPR | Fixed-frequency voltage-mode control; no adaptive ZVS; requires external slope compensation. | Less suited for wide-input telecom rails; higher external component count for ZVS implementation. | Prefer LTC3722IGN-1#PBF when adaptive ZVS, low start-up current, or integrated 5V reference are required. |
| LM5045MTX/NOPB | Voltage-mode only; no current-mode option; lacks programmable LEB and synchronous rectifier timing. | Designed for lower-power applications (<150W); limited ZVS flexibility in variable-load telecom environments. | Choose LTC3722IGN-1#PBF for >200W designs needing peak current mode stability and precise ZVS tuning. |
Compared with UCC28950PWPR and LM5045MTX/NOPB, the LTC3722IGN-1#PBF uniquely combines adaptive ZVS, peak current mode control, and integrated synchronous rectifier timing - reducing external component count and improving light-load efficiency in high-power telecom and server PSUs.
Availability
LTC3722IGN-1#PBF is available at Aetrix Electronics and suitable for telecom rectifier modules, server power supplies, and industrial 48V DC distribution systems requiring stable component supply and long-term lifecycle support.
Supply support for LTC3722IGN-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and power management markets.
The LTC3722 product line delivers advanced phase-shift PWM controllers for ZVS full-bridge converters - designed specifically for high-efficiency, high-reliability infrastructure power systems in telecom and datacenter applications.
FAQ
What is the operating temperature range for the LTC3722IGN-1#PBF?
The LTC3722IGN-1#PBF is rated for –40°C to +85°C junction temperature operation. This specification is guaranteed per Analog Devices' datasheet Rev C, and the device uses a 24-lead GN (narrow SSOP) package with θJA = 100°C/W. The "I" grade designation confirms industrial temperature qualification.
Does the LTC3722IGN-1#PBF support both adaptive and fixed ZVS modes?
Yes, the LTC3722IGN-1#PBF supports both modes. In adaptive mode, SBUS, ADLY, and PDLY pins monitor bridge-leg voltages to dynamically adjust ZVS timing. In fixed mode, tying SBUS to VREF enables resistor-programmed delays via ADLY and PDLY - useful for secondary-side control architectures.
How is synchronous rectifier timing controlled on the LTC3722IGN-1#PBF?
Synchronous rectifier timing is controlled via the SPRG pin: a resistor between SPRG and GND sets the turn-off delay for OUTE and OUTF drivers. This allows precise adjustment of secondary-side FET conduction timing to minimize reverse recovery losses and maximize efficiency in full-bridge LLC or phase-shifted topologies.
What is the function of the RLEB pin on the LTC3722IGN-1#PBF?
The RLEB pin programs leading edge blanking time for the current-sense (CS) input. Using a 10k–100kΩ resistor, blanking is adjustable from 40ns to 310ns - suppressing false current-limit triggers caused by gate-drive-induced noise during MOSFET turn-on transitions.
Can the LTC3722IGN-1#PBF be used with voltage-mode control?
No - the LTC3722IGN-1#PBF implements peak current mode control only. The "-1" suffix denotes current-mode operation with programmable slope compensation and leading edge blanking. For voltage-mode control, the pin-compatible LTC3722IGN-2#PBF must be selected instead.
LTC3722IGN-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3.8V ~ 10.25V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- 98.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Ramp, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3722IGN-1#PBF FAQ
1.How can I place an order for LTC3722IGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3722IGN-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 LTC3722IGN-1#PBF reliable?
The price and inventory of LTC3722IGN-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 LTC3722IGN-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3722IGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3722IGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3722IGN-1#PBF?
LTC3722IGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3722IGN-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 LTC3722IGN-1#PBF?
For technical support, including LTC3722IGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3722IGN-1#PBF requirements.
6.How does Aetrix verify that LTC3722IGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3722IGN-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 LTC3722IGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3722IGN-1#PBF?
All LTC3722IGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3722IGN-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 LTC3722IGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC3722IGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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