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Analog Devices Inc. LTC3722IGN-2#TRPBF
- Part No.:
- LTC3722IGN-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3722IGN-2#TRPBF.pdf
- Description:
- IC REG CTRLR FULL-BRIDGE 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,414
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Product details
Overview
LTC3722IGN-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 delay control, 50mA synchronous rectifier drivers (OUTE/OUTF), 5V reference output (±0.75% initial accuracy), and operates from 6V to 9.5V VCC with 8mA typical operating current. It targets high-efficiency telecom and server power supplies delivering up to 240W at 12V output.
For engineers reviewing the LTC3722IGN-2#TRPBF datasheet, LTC3722IGN-2#TRPBF pinout, LTC3722IGN-2#TRPBF application, or LTC3722IGN-2#TRPBF equivalent, key selection criteria include ZVS delay programmability via ADLY/PDLY pins, SBUS-based adaptive vs. fixed mode configuration, voltage-mode control architecture, and compatibility with external gate drivers such as LTC4440 and LTC3901.
Technical Context
The LTC3722IGN-2#TRPBF implements voltage-mode phase modulation using an internal RAMP input (Pin 2) level-shifted by 650mV, enabling precise duty cycle control independent of load current. Its adaptive ZVS circuitry monitors SBUS voltage to dynamically adjust active/passive leg delays, while fixed-mode operation is selected by tying SBUS to VREF.
It integrates six 50mA gate drivers (OUTA–OUTF) with programmable turn-off timing via SPRG, supports soft-start via SS capacitor, and features dual current-limit thresholds (300mV pulse-by-pulse, 650mV overload) on the CS pin. The error amplifier provides 90dB open-loop gain and 1.204V FB regulation voltage with ±3mV temperature drift over –40°C to 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Accuracy | ±0.75% (4.925V–5.075V) - enables precise biasing of external circuits without trimming |
| Oscillator Frequency | 250kHz ±10% (CT = 270pF) - sets base switching frequency for 12V/240W telecom converter design |
| Output Drive Current | ±100mA per driver (OUTA–OUTF) - directly drives high-side gate drivers like LTC4440 without buffer stages |
| FB Regulation Voltage | 1.204V ±3mV over temperature - ensures stable 12V output regulation with minimal feedback divider error |
| Start-Up Current | 145µA max - allows reliable start-up from low-power auxiliary rails in distributed power architectures |
| ZVS Delay Range | 0ns to 310ns (programmable via RDPRG/ADLY/PDLY) - supports full-load ZVS across 36V–72V input range |
| Operating Temperature | –40°C to +85°C (industrial grade) - validated for server PSU and telecom infrastructure environments |
Pinout & Package
24-pin narrow plastic SSOP (GN package), 0.635mm pitch, exposed pad not electrically connected. Package dimensions: 8.65mm × 3.90mm × 1.75mm (L×W×H). Thermal resistance θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA, OUTB, OUTC, OUTD | Full-bridge primary-side gate drivers | Drive high/low-side MOSFETs A–D; OUTA/OUTC are high-side referenced to PGND, OUTB/OUTD are low-side |
| OUTE, OUTF | Synchronous rectifier drivers | 50mA outputs for secondary-side synchronous FETs; timing programmable via SPRG resistor |
| ADLY, PDLY | ZVS active/passive leg delay inputs | Voltage-programmable (0–2.5V) fixed delays; in adaptive mode, connect to bridge-leg voltage dividers |
| SBUS | Bridge input voltage sense | Determines ZVS mode: tied to VREF → fixed delay; divided from VIN → adaptive delay proportional to line voltage |
| CS | Current-sense comparator input | Accepts 300mV pulse-by-pulse limit signal; internal blanking prevents false triggering during switching transitions |
| RAMP | Voltage-mode modulator input | Internal 650mV level-shifted ramp feeds phase modulator; replaces external slope compensation required in current-mode variants |
| UVLO | System undervoltage lockout input | 5.0V threshold with 10µA hysteresis current - sets accurate 36V–72V input turn-on/turn-off points via resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-mode control architecture | Eliminates need for external slope compensation and leading-edge blanking components required by current-mode controllers |
| Adaptive ZVS with DirectSense™ technology | Monitors SBUS to auto-adjust ADLY/PDLY delays across input voltage and load variations - no manual tuning needed |
| Programmable synchronous rectifier timing | SPRG resistor sets precise turn-off delay for OUTE/OUTF - maximizes secondary-side efficiency by minimizing reverse conduction loss |
| Integrated 5V/15mA LDO and 10.3V shunt regulator | Powers external circuitry and self-regulates VCC - removes need for discrete bias supply in isolated topologies |
| Low 145µA start-up current | Enables reliable cold-start from standby rails in multi-rail server PSUs without auxiliary winding dependency |
| 24-pin SSOP with thermal pad option | Standard footprint compatible with automated assembly; PGND pin (22) and GND pin (23) separated for noise isolation between power and signal grounds |
Applications
| Telecom Rectifier Module | Server Primary-Side Controller |
|---|---|
Use Scenario: 48V input, 12V/20A output telecom rectifier in -48V DC plant systems. IC Role / Device Role / Timing Role: Full-bridge phase-shift controller managing ZVS transitions across 36V–72V input range with adaptive SBUS sensing. Use Value: Achieves >95% peak efficiency at full load by eliminating body-diode conduction loss via precise ADLY/PDLY delay tuning. |
Use Scenario: 12V intermediate bus converter in 1U server PSU with strict thermal constraints. IC Role / Device Role / Timing Role: Voltage-mode controller driving four primary MOSFETs and two synchronous rectifiers with SPRG-timed turn-off. Use Value: Reduces secondary-side conduction loss by 12% versus diode rectification, lowering output stage temperature rise by 8°C. |
| Distributed Power Architecture | Industrial Isolated DC/DC |
Use Scenario: Point-of-load (POL) 48V-to-12V converter feeding FPGA and ASIC power rails. IC Role / Device Role / Timing Role: ZVS full-bridge controller with fixed-mode operation (SBUS = VREF) for predictable timing in compact layouts. Use Value: Enables 250kHz switching with <100ns dead-time control - reduces transformer size by 35% versus 100kHz designs. |
Use Scenario: 36V–75V input industrial DC/DC module requiring extended temperature operation. IC Role / Device Role / Timing Role: Industrial-grade controller (–40°C to +85°C) managing ZVS under wide input and load transients. Use Value: Maintains ZVS down to 10% load via programmable minimum delay, improving light-load efficiency by 4.2 percentage points. |
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 |
|---|---|---|---|
| UCC28950PW | Voltage-mode controller with integrated 1.5A gate drivers; no separate synchronous rectifier outputs; requires external VREF | Better suited for higher-current primary-side drive but lacks dedicated OUTE/OUTF timing control | Select when driving discrete high-current gate drivers directly and secondary-side timing is managed externally |
| LTC3722IGN-1#TRPBF | Peak current-mode variant with programmable slope compensation and RLEB pin; different RAMP/CS pin assignments | Preferred for designs requiring tighter current-loop response and inherent cycle-by-cycle current limiting | Select when input line rejection and transient response are prioritized over simplified layout and reduced external components |
Compared with UCC28950PW and LTC3722IGN-1#TRPBF, the LTC3722IGN-2#TRPBF offers dedicated synchronous rectifier timing control and eliminates slope compensation components, reducing BOM count by three resistors and one capacitor while maintaining ZVS across telecom input ranges.
Availability
LTC3722IGN-2#TRPBF is available at Aetrix Electronics and suitable for telecom rectifier modules, server primary-side controllers, and distributed power architecture converters requiring stable component supply, long-term lifecycle support, and industrial temperature grade performance.
Supply support for LTC3722IGN-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and industrial applications.
The LTC3722 product line delivers phase-shifted full-bridge controllers optimized for zero-voltage-switched DC/DC conversion in telecom, server, and industrial power systems - emphasizing adaptive ZVS, integrated synchronous rectifier timing, and robust thermal performance.
FAQ
What is the function of the SBUS pin on the LTC3722IGN-2#TRPBF?
The SBUS pin on the LTC3722IGN-2#TRPBF senses the main DC input voltage via a resistor divider to enable adaptive zero-voltage switching. When SBUS is tied to VREF, the LTC3722IGN-2#TRPBF enters fixed-delay ZVS mode for simplified secondary-side control. In adaptive mode, SBUS voltage directly scales ADLY and PDLY delay times to maintain ZVS across input voltage variations - a core feature of the LTC3722IGN-2#TRPBF's DirectSense™ architecture.
How does the LTC3722IGN-2#TRPBF differ from the LTC3722IGN-1#TRPBF in control architecture?
The LTC3722IGN-2#TRPBF uses voltage-mode control with an internal RAMP input (Pin 2), eliminating the need for external slope compensation. In contrast, the LTC3722IGN-1#TRPBF employs peak current-mode control with programmable slope compensation via the CS pin and RLEB resistor. This makes the LTC3722IGN-2#TRPBF simpler to stabilize and less sensitive to noise on the current-sense path, while the LTC3722IGN-1#TRPBF offers faster transient response and inherent cycle-by-cycle current limiting - a key distinction between the two variants of the LTC3722IGN-2#TRPBF family.
Can the LTC3722IGN-2#TRPBF drive MOSFETs directly, or does it require external gate drivers?
The LTC3722IGN-2#TRPBF provides six 50mA gate drivers (OUTA–OUTF) optimized for interfacing with external high-speed gate driver ICs like the LTC4440 and LTC3901, not for direct MOSFET drive. Its outputs lack the peak current capability (>1A) needed for low-RDS(on) power MOSFETs. Using external drivers ensures fast edge rates, proper level shifting for high-side switches, and robust shoot-through protection - all essential for reliable ZVS operation in full-bridge topologies powered by the LTC3722IGN-2#TRPBF.
What is the purpose of the SPRG pin on the LTC3722IGN-2#TRPBF?
The SPRG pin on the LTC3722IGN-2#TRPBF sets the turn-off delay for synchronous rectifier drivers OUTF and OUTE via an external resistor to ground. This programmable delay prevents cross-conduction between primary-side and secondary-side FETs during dead-time transitions. For example, a 100kΩ resistor yields ~180ns turn-off delay - critical for maximizing efficiency in 12V output converters by minimizing reverse recovery losses in the synchronous rectifiers controlled by the LTC3722IGN-2#TRPBF.
Does the LTC3722IGN-2#TRPBF support synchronization with an external clock source?
Yes, the LTC3722IGN-2#TRPBF supports external synchronization via the SYNC pin (Pin 1), which accepts CMOS/TTL-compatible signals with a 1.9V threshold. When driven by an external clock, the internal oscillator locks to half the input frequency - ensuring precise phase alignment across multiple converters in parallel or multiphase systems. This capability is essential for EMI reduction and current sharing in high-power telecom and server PSUs using the LTC3722IGN-2#TRPBF.
LTC3722IGN-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
LTC3722IGN-2#TRPBF FAQ
1.How can I place an order for LTC3722IGN-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3722IGN-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 LTC3722IGN-2#TRPBF reliable?
The price and inventory of LTC3722IGN-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 LTC3722IGN-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3722IGN-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3722IGN-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3722IGN-2#TRPBF?
LTC3722IGN-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3722IGN-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 LTC3722IGN-2#TRPBF?
For technical support, including LTC3722IGN-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3722IGN-2#TRPBF requirements.
6.How does Aetrix verify that LTC3722IGN-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3722IGN-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 LTC3722IGN-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3722IGN-2#TRPBF?
All LTC3722IGN-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3722IGN-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 LTC3722IGN-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3722IGN-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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