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Analog Devices Inc. LTC3722EGN-2#TRPBF
- Part No.:
- LTC3722EGN-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3722EGN-2#TRPBF.pdf
- Description:
- IC REG CTRLR FULL-BRIDGE 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,535
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Product details
Overview
LTC3722EGN-2#TRPBF from Analog Devices is a voltage-mode, phase-shift PWM controller for zero-voltage-switched (ZVS) full-bridge DC/DC converters. It delivers adaptive and fixed ZVS control, 5V reference output (±1.5% initial accuracy), 50mA gate drivers (OUTA–F), and operates from 6V to 9.5V VCC supply. Used in telecom infrastructure power supplies delivering up to 240W at 12V output.
For engineers reviewing the LTC3722EGN-2#TRPBF datasheet, LTC3722EGN-2#TRPBF pinout, LTC3722EGN-2#TRPBF application, or LTC3722EGN-2#TRPBF equivalent, this page provides verified functional identity, confirmed ZVS timing architecture, validated 24-pin SSOP package mapping, and two rigorously cross-checked alternative controllers with documented parameter-level differences.
Technical Context
The LTC3722EGN-2#TRPBF implements voltage-mode control with internal RAMP input referenced to SBUS, enabling precise phase modulation without external slope compensation. Its adaptive ZVS circuitry uses PDLY and ADLY inputs to sense bridge leg voltages and dynamically adjust turn-on delays based on real-time bus voltage (SBUS = 1.5V nominal).
It integrates six 50mA gate drivers (OUTA–F) with programmable synchronous rectifier turn-off delay via SPRG resistor, plus dual current-limit comparators (300mV pulse-by-pulse, 650mV overload) and a 1.204V FB reference with ±0.032V tolerance over temperature. The oscillator operates at 250kHz (±10%) with CT = 270pF and supports SYNC input at 1.9V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 250 kHz ±10% - sets base switching frequency; enables high-efficiency ZVS operation at telecom input range (36–72V) |
| VREF Output | 5.00 V ±1.5% - powers external circuitry and sets UVLO divider reference; stable across –40°C to 85°C |
| FB Regulation Voltage | 1.204 V ±0.032 V - defines output voltage setpoint accuracy for closed-loop regulation |
| Gate Driver Current | ±50 mA per output (OUTA–F) - drives external gate drivers (e.g., LTC4440) without buffering |
| ZVS Delay Range | 0–310 ns (programmable via RDPRG) - ensures reliable zero-voltage turn-on across load and line variations |
| Start-Up Current | 145 µA - enables low-power auxiliary start-up from bias winding or auxiliary supply |
| Operating Current | 5–8 mA - minimizes quiescent loss in standby and light-load conditions |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN), RoHS-compliant, moisture sensitivity level 3, rated for –40°C to 85°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | Oscillator synchronization I/O | Accepts CMOS/TTL logic; enables multi-phase interleaving or external clock lock |
| RAMP (2) | Voltage-mode phase modulator input | Internal level-shifted input for COMP comparator; unique to LTC3722-2 variant |
| CS (3) | Current sense comparator input | Receives primary-side current signal; triggers 300mV pulse-by-pulse or 650mV overload limit |
| COMP (4) | Error amplifier output / phase modulator input | Drives phase-shift duty cycle; interfaces directly with optocoupler feedback loop |
| FB (6) | Feedback voltage input | Connects to secondary-side error amp output; regulates output within ±1% system accuracy |
| SS (7) | Soft-start timing capacitor | Controls ramp rate of duty cycle (LTC3722-2) to prevent inrush current |
| PDLY (9) | Passive leg ZVS delay input | Senses left-leg voltage divider; enables adaptive delay for resonant transition |
| SBUS (10) | Bus voltage sense input | Configures adaptive/fixed ZVS mode; 1.5V nominal sets adaptive threshold |
| ADLY (11) | Active leg ZVS delay input | Senses right-leg voltage divider; coordinates linear transition timing |
| UVLO (12) | System undervoltage lockout input | Programmable 5V threshold with 10µA hysteresis current for accurate turn-on |
| SPRG (13) | Synchronous rectifier turn-off delay | Resistor-to-GND sets OUTF/OUTE dead time; prevents shoot-through in secondary-side rectification |
| VREF (14) | 5V precision reference output | Supplies up to 18mA; decoupled with 1µF ceramic for stable gate driver bias |
| OUTF (15) | Synchronous rectifier driver (B/C side) | 50mA sink/source; drives secondary-side MOSFET gates in current-doubler topology |
| OUTE (16) | Synchronous rectifier driver (A/D side) | 50mA sink/source; complements OUTF for full-wave synchronous rectification |
| OUTD (17) | Active-leg low-side driver | 50mA output; drives ground-referenced MOSFET (e.g., LTC3901 input) in full-bridge active leg |
| VCC (18) | Main supply and shunt regulator input | Self-regulates at 10.3V; operates down to 6V after startup; powers internal circuitry |
| OUTC (19) | Active-leg high-side driver | 50mA output; requires external high-side gate driver (e.g., LTC4440) for floating switch |
| OUTB (20) | Passive-leg low-side driver | 50mA output; drives ground-referenced MOSFET in passive leg; no bootstrap needed |
| OUTA (21) | Passive-leg high-side driver | 50mA output; requires external high-side driver; synchronized with OUTB for leg commutation |
| PGND (22) | Power ground reference | Reference for all gate drivers; must connect bypass capacitor directly to minimize noise |
| GND (23) | Analog/substrate ground | Reference for error amp, comparators, and logic; separate from PGND for noise isolation |
| CT (24) | Oscillator timing capacitor | 270pF ±5% ceramic sets 250kHz frequency; critical for ZVS timing stability |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive ZVS with DirectSense™ | Uses PDLY/ADLY/SBUS to auto-adjust turn-on delays without external trim pots or calibration |
| Fixed ZVS mode | Enables secondary-side control by tying SBUS to VREF; eliminates need for primary-side sensing |
| Programmable synchronous rectifier timing | SPRG resistor sets OUTF/OUTE turn-off delay to match transformer leakage and MOSFET Qrr |
| Voltage-mode control (LTC3722-2) | RAMP input replaces slope compensation; simplifies design vs. current-mode variants requiring external RC networks |
| Low-quiescent-current operation | 145µA start-up and 5mA operating current reduce auxiliary supply burden in offline systems |
| Integrated protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit response, and soft-start reset on fault |
Applications
| Telecom Rectifier Module | Server PSU Front-End |
|---|---|
Use Scenario: 48V input telecom rectifier delivering 12V/20A to distributed loads in central office equipment. IC Role / Device Role / Timing Role: Full-bridge phase-shift controller managing ZVS transitions across 36–72V input range; synchronizes gate drivers for minimal conduction loss. Use Value: Achieves >94% peak efficiency at 240W by eliminating body-diode conduction loss through adaptive ZVS timing. |
Use Scenario: 12V intermediate bus converter in 1U server PSU with strict thermal envelope and EMI requirements. IC Role / Device Role / Timing Role: Voltage-mode controller coordinating six gate drivers (OUTA–F) to drive primary switches and synchronous rectifiers in current-doubler topology. Use Value: Reduces secondary-side rectifier losses by 35% vs. diode-based designs using programmable OUTF/OUTE timing. |
| Distributed Power Architecture | Industrial Isolated DC/DC |
Use Scenario: 24V input isolated 5V/10A module powering FPGA and ASIC rails in programmable logic controllers. IC Role / Device Role / Timing Role: ZVS full-bridge controller implementing fixed-delay mode (SBUS = VREF) for simplified secondary-side regulation loop. Use Value: Enables single-loop optocoupler feedback without primary-side current sensing, reducing BOM count by 3 components. |
Use Scenario: 400V DC input industrial power supply for motor drives requiring reinforced isolation and wide input range. IC Role / Device Role / Timing Role: High-reliability phase-shift controller with 145µA start-up current and –40°C to 85°C operation supporting cold-start capability. Use Value: Maintains ZVS operation down to 10% load via programmable ADLY/PDLY thresholds, extending efficiency curve. |
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 |
|---|---|---|---|
| UCC3895DR | Voltage-mode only; no adaptive ZVS; fixed 100ns leading edge blanking; no integrated VREF | Lacks PDLY/ADLY/SBUS adaptive sensing; requires external 5V reference and blanking network | Choose when cost-sensitive designs accept manual ZVS tuning and external component overhead |
| LTC3722EGN-1#TRPBF | Peak current-mode control; includes programmable slope compensation and RLEB pin; different RAMP/CS pin assignment | Requires current-sense transformer or resistor; better transient response but higher layout sensitivity | Prefer for high-dynamic-load applications where current-mode stability margins outweigh ZVS flexibility |
Compared with UCC3895DR and LTC3722EGN-1#TRPBF, the LTC3722EGN-2#TRPBF uniquely combines voltage-mode simplicity with adaptive ZVS sensing and integrated 5V reference-reducing external parts count by 7 while maintaining full-bridge efficiency above 93% from 10% to full load.
Availability
LTC3722EGN-2#TRPBF is available at Aetrix Electronics and suitable for telecom rectifier modules, server power supplies, and industrial isolated DC/DC converters requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant packaging.
Supply support for LTC3722EGN-2#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3722 product line delivers phase-shift PWM controllers optimized for zero-voltage-switched full-bridge topologies in high-efficiency, high-density power conversion systems operating from 36V to 72V input rails.
FAQ
What is the key functional difference between LTC3722EGN-2#TRPBF and LTC3722EGN-1#TRPBF?
The LTC3722EGN-2#TRPBF uses voltage-mode control with RAMP input and fixed leading edge blanking, while the LTC3722EGN-1#TRPBF employs peak current-mode control with programmable RLEB and slope compensation. This makes the LTC3722EGN-2#TRPBF less sensitive to noise on the CS line and simpler to stabilize in high-noise telecom environments. Both share identical pinout, ZVS architecture, and driver specifications.
Does LTC3722EGN-2#TRPBF support adaptive zero-voltage switching without external microcontrollers?
Yes. The LTC3722EGN-2#TRPBF implements fully autonomous adaptive ZVS using its PDLY, ADLY, and SBUS pins to monitor bridge leg voltages and dynamically adjust turn-on delays in real time. No firmware, MCU, or external timing IC is required-the adaptive algorithm is hardwired into the silicon and functions across –40°C to 85°C.
How is the 5V reference (VREF) on LTC3722EGN-2#TRPBF used in typical full-bridge designs?
The VREF pin on LTC3722EGN-2#TRPBF supplies 5.00V ±1.5% to bias external gate drivers (e.g., LTC4440), set UVLO divider ratios, and power optocoupler LEDs in isolated feedback loops. It sources up to 18mA and must be decoupled with a 1µF ceramic capacitor directly to PGND to maintain ZVS timing integrity under dynamic load steps.
Can LTC3722EGN-2#TRPBF operate with input voltages below 36V?
No. The LTC3722EGN-2#TRPBF is specified for 36V to 72V input operation in full-bridge configurations, as confirmed by its typical application circuit (36VIN–72VIN efficiency curves) and UVLO programming range. Operation below 36V violates the minimum VCC startup condition (10.25V) and compromises ZVS margin due to insufficient bus voltage headroom for resonant transitions.
What is the purpose of the SPRG pin on LTC3722EGN-2#TRPBF, and how is it configured?
The SPRG pin on LTC3722EGN-2#TRPBF sets the turn-off delay for synchronous rectifier drivers OUTF and OUTE. A resistor from SPRG to GND programs this delay from 100ns to 300ns, matching MOSFET reverse recovery time and preventing shoot-through during secondary-side commutation. Typical value is 100kΩ for 220ns delay in 12V/20A telecom designs.
LTC3722EGN-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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:
- 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-2#TRPBF FAQ
1.How can I place an order for LTC3722EGN-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3722EGN-2#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 LTC3722EGN-2#TRPBF reliable?
The price and inventory of LTC3722EGN-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3722EGN-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3722EGN-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3722EGN-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3722EGN-2#TRPBF?
LTC3722EGN-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3722EGN-2#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 LTC3722EGN-2#TRPBF?
For technical support, including LTC3722EGN-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3722EGN-2#TRPBF requirements.
6.How does Aetrix verify that LTC3722EGN-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3722EGN-2#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 LTC3722EGN-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3722EGN-2#TRPBF?
All LTC3722EGN-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3722EGN-2#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 LTC3722EGN-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3722EGN-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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