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Analog Devices Inc. LTC3722EGN-1#PBF
- Part No.:
- LTC3722EGN-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3722EGN-1#PBF.pdf
- Description:
- IC REG CTRLR FULL-BRIDGE 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,906
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Product details
Overview
LTC3722EGN-1#PBF from Analog Devices is a synchronous dual-mode phase-modulated full-bridge PWM controller for zero-voltage-switched (ZVS) DC/DC converters, featuring peak current mode control, programmable slope compensation, and 50mA gate drivers for six external MOSFETs. It operates from 6V to 9.5V VCC, delivers up to 240W output (e.g., 12V/20A), and targets telecom infrastructure power supplies.
For engineers reviewing the LTC3722EGN-1#PBF datasheet, LTC3722EGN-1#PBF pinout, LTC3722EGN-1#PBF application, or LTC3722EGN-1#PBF equivalent, key selection criteria include ZVS delay programmability, adaptive vs. fixed delay modes, synchronous rectifier timing control, UVLO hysteresis tuning, and compatibility with external gate drivers like LTC4440/LTC3901.
Technical Context
The LTC3722EGN-1#PBF implements a phase-shifted full-bridge topology with independent active-leg and passive-leg delay control via ADLY and PDLY pins, enabling precise ZVS timing across load and input voltage variations. Its adaptive ZVS circuitry uses SBUS-sensed line voltage to dynamically adjust turn-on delays without external trimming.
It integrates a 1.204V error amplifier reference, programmable leading edge blanking (via RLEB), and a 250kHz oscillator (±10% over temperature) with SYNC input/output capability. The device supports soft-start, cycle-by-cycle current limiting, hiccup-mode short-circuit protection, and features a 5V/18mA VREF output with ±1.5% initial accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 6V to 9.5V - enables stable operation after shunt regulator engages at 10.25V and sustains function down to 6V during transients. |
| Oscillator Frequency | 250kHz typical (225–275kHz) - sets base switching frequency; CT = 270pF defines timing, supporting high-efficiency ZVS at telecom voltages (36–72V input). |
| Error Amplifier FB Voltage | 1.204V ±3mV - precision reference for output voltage regulation; used with external resistor divider to set 12V, 48V, or other isolated outputs. |
| Output Driver Current | ±100mA per OUTx pin - drives external gate drivers (e.g., LTC4440) directly; OUTA–OUTD control primary-side bridge, OUTE/OUTF drive secondary-side synchronous rectifiers. |
| ZVS Delay Programmability | Adjustable via DPRG, ADLY, PDLY, and SBUS - enables both adaptive (line-sense) and manual fixed-delay modes for robust zero-voltage transitions across full load range. |
| Start-Up Current | 145µA max - ensures low-power enablement in standby systems; critical for distributed power architectures requiring fast wake-up from low-power states. |
| UVLO Threshold | 5.0V ±0.2V on UVLO pin - defines system turn-on voltage; hysteresis set by external resistor divider enables clean power sequencing in server PSUs. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN package), surface-mount, 0.15mm lead pitch, –40°C to 85°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA, OUTB, OUTC, OUTD | Full-bridge primary-side gate drivers | Drive high-side (A/C) and low-side (B/D) MOSFETs; each rated for ±100mA, compatible with discrete buffers or gate driver ICs. |
| OUTE, OUTF | Synchronous rectifier drivers | 50mA sink/source per pin; timed relative to primary outputs to minimize body-diode conduction loss on secondary side. |
| ADLY, PDLY, SBUS, DPRG | ZVS delay control inputs | Enable adaptive (SBUS + ADLY/PDLY) or fixed-delay (ADLY/PDLY voltage-programmed) ZVS; eliminate external timing ICs or trim pots. |
| CS, COMP, FB, SS | Control loop interface | CS senses primary current; COMP feeds phase modulator; FB closes output voltage loop; SS sets soft-start ramp time via capacitor. |
| VREF, UVLO, CT, GND, PGND | Reference, protection, timing, grounding | VREF = 5.00V ±0.075V source for biasing; UVLO programs system ON/OFF thresholds; CT sets oscillator frequency; PGND separates power return paths. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive ZVS with DirectSense™ | Uses SBUS voltage feedback to auto-adjust ADLY/PDLY delays - eliminates manual tuning and maintains ZVS across 10–100% load in telecom 48V systems. |
| Programmable synchronous rectifier timing | SPRG resistor sets turn-off delay for OUTE/OUTF - optimizes dead-time to prevent shoot-through while minimizing reverse recovery losses. |
| Integrated 5V/18mA reference | VREF output powers external circuitry (e.g., optocoupler bias, sense resistors) - reduces need for auxiliary LDOs in isolated designs. |
| Leading edge blanking (LEB) | RLEB resistor programs 40–310ns blanking window on CS pin - suppresses noise-induced false current-limit trips during MOSFET switching edges. |
| Peak current mode control | Includes programmable slope compensation (via CT) - stabilizes duty cycle >50%, prevents subharmonic oscillation in high-ratio transformers. |
Applications
| Telecom Rectifier Modules | Server PSU Main Converter |
|---|---|
|
Use Scenario: 48V input, 12V/20A output DC/DC stage in -48V telecom rectifier rack units. IC Role / Device Role / Timing Role: Full-bridge phase-shift controller managing four primary MOSFETs and two synchronous rectifiers with adaptive ZVS timing. Use Value: Achieves >94% efficiency at full load by eliminating hard-switching losses and enabling optimal synchronous rectification timing. |
Use Scenario: High-density 54V input, 12V output main converter in 1U server power supply with strict thermal limits. IC Role / Device Role / Timing Role: Primary-side PWM controller implementing ZVS with programmable delay timeout and soft-start sequencing. Use Value: Reduces EMI and MOSFET temperature rise via controlled zero-voltage transitions, enabling smaller heatsinks and higher power density. |
| Distributed Power Architecture (DPA) | Industrial 48V Intermediate Bus Converter |
|
Use Scenario: 48V intermediate bus supplying multiple point-of-load regulators in programmable logic controller (PLC) backplanes. IC Role / Device Role / Timing Role: Isolated full-bridge controller with UVLO hysteresis programming and fault reset via SS pin. Use Value: Ensures clean power-up/down sequencing and hiccup-mode protection against sustained overload, improving system reliability. |
Use Scenario: 48V-to-12V conversion in industrial motor drive control modules requiring wide temperature operation (–40°C to 85°C). IC Role / Device Role / Timing Role: Phase-modulated controller with programmable slope compensation and leading edge blanking for stable current-mode operation. Use Value: Maintains regulation accuracy and loop stability across temperature extremes and varying line/load conditions without external compensation. |
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 |
|---|---|---|---|
| UCC3895PW | Voltage-mode only; no adaptive ZVS; fixed 100kHz–1MHz frequency range; no integrated VREF or synchronous rectifier drivers. | Requires external gate drivers, LDO, and ZVS timing circuitry - increases BOM count and layout complexity for telecom-grade efficiency. | Choose UCC3895PW only if legacy design reuse or cost-sensitive non-ZVS applications are prioritized over efficiency and integration. |
| LTC3722EGN-2#PBF | Voltage-mode control instead of peak current mode; no slope compensation or RLEB; identical pinout, ZVS architecture, and driver specs. | Better suited for systems with stable input voltage and minimal transient response demands; avoids current-sense noise sensitivity. | Select LTC3722EGN-2#PBF when output regulation stability under steady-state conditions outweighs need for fast current-loop response. |
Compared with UCC3895PW and LTC3722EGN-2#PBF, the LTC3722EGN-1#PBF uniquely combines peak current mode control, adaptive ZVS, integrated synchronous rectifier timing, and a 5V reference - reducing external components by ≥40% and enabling <1% output voltage regulation error in telecom rectifiers.
Availability
LTC3722EGN-1#PBF is available at Aetrix Electronics and suitable for telecom rectifier modules, server power supplies, and industrial intermediate bus converters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3722EGN-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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.
The LTC3722 product line was designed specifically for high-efficiency, isolated full-bridge DC/DC converters in telecom, server, and industrial infrastructure - emphasizing adaptive ZVS, integrated protection, and minimal external component count.
FAQ
What is the primary function of the LTC3722EGN-1#PBF in a power supply design?
The LTC3722EGN-1#PBF serves as a phase-shifted full-bridge PWM controller that manages four primary-side MOSFETs and two secondary-side synchronous rectifiers to implement zero-voltage switching (ZVS). Its core function is to regulate output voltage via feedback while dynamically adjusting gate timing to minimize switching losses - a critical requirement in high-efficiency telecom and server power supplies where the LTC3722EGN-1#PBF delivers up to 94% efficiency at 240W.
How does the LTC3722EGN-1#PBF achieve adaptive zero-voltage switching?
The LTC3722EGN-1#PBF achieves adaptive ZVS by monitoring the main DC input voltage via the SBUS pin and using that signal to dynamically adjust the turn-on delays applied to the ADLY and PDLY pins. This real-time adjustment compensates for variations in input voltage and load current, ensuring MOSFETs switch precisely when drain-source voltage reaches zero - eliminating body-diode conduction losses without external calibration. The LTC3722EGN-1#PBF implements this through its proprietary DirectSense™ circuitry, which is confirmed in the device's block diagram and timing specifications.
Can the LTC3722EGN-1#PBF operate without an external gate driver IC?
No - the LTC3722EGN-1#PBF is not intended to drive power MOSFETs directly. Its OUTA–OUTF outputs deliver ±100mA peak current and are optimized to interface with dedicated gate driver ICs such as the LTC4440 (for high-side primary switches) and LTC3901 (for synchronous rectifiers). Driving MOSFETs directly would exceed safe SOA limits due to capacitive gate charge requirements and lack of level-shifting capability. The LTC3722EGN-1#PBF datasheet explicitly specifies external driver use in all application circuits.
What is the role of the RLEB pin on the LTC3722EGN-1#PBF?
The RLEB pin on the LTC3722EGN-1#PBF sets the duration of leading edge blanking for the current-sense (CS) signal - a critical feature for noise immunity in high-dv/dt full-bridge environments. A resistor (10k–100kΩ) between RLEB and GND programs blanking from 40ns to 310ns, preventing false triggering of the pulse-by-pulse current limit comparator during MOSFET turn-on transients. This function is exclusive to the LTC3722EGN-1#PBF variant and is absent in the LTC3722-2 family.
Does the LTC3722EGN-1#PBF support synchronization with an external clock source?
Yes - the LTC3722EGN-1#PBF supports external clock synchronization via the SYNC pin (Pin 1), which accepts CMOS- or TTL-compatible signals with a 1.9V threshold. When driven externally, the internal oscillator locks to half the input frequency, enabling multi-phase interleaving or EMI reduction in multi-rail systems. The SYNC pin also functions as an output, allowing one LTC3722EGN-1#PBF to drive others - a capability verified in the device's timing diagram and electrical characteristics table.
LTC3722EGN-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
LTC3722EGN-1#PBF FAQ
1.How can I place an order for LTC3722EGN-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3722EGN-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 LTC3722EGN-1#PBF reliable?
The price and inventory of LTC3722EGN-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 LTC3722EGN-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3722EGN-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3722EGN-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3722EGN-1#PBF?
LTC3722EGN-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3722EGN-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 LTC3722EGN-1#PBF?
For technical support, including LTC3722EGN-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3722EGN-1#PBF requirements.
6.How does Aetrix verify that LTC3722EGN-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3722EGN-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 LTC3722EGN-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3722EGN-1#PBF?
All LTC3722EGN-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3722EGN-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 LTC3722EGN-1#PBF part is unused and in its original packaging.
Return procedure for LTC3722EGN-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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