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Analog Devices Inc. LTC3722HGN-1
- Part No.:
- LTC3722HGN-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3722HGN-1.pdf
- Description:
- IC POWER MANAGEMENT
- Quantity:
- Payment:
- Shipping:
Inventory:4,132
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Product details
Overview
LTC3722HGN-1 from Analog Devices is a high-efficiency, zero-voltage-switched (ZVS) phase-shift PWM controller for full-bridge DC/DC converters, featuring peak current mode control, programmable slope compensation, and adaptive/manual ZVS delay tuning. It delivers precise phase modulation across six output drivers (OUTA–OUTF), supports 36V–72V input, regulates 12V/240W outputs, and operates up to 150°C junction temperature in telecom and server power supplies.
For engineers reviewing the LTC3722HGN-1 datasheet, LTC3722HGN-1 pinout, LTC3722HGN-1 application, or LTC3722HGN-1 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and two rigorously cross-referenced alternative controllers for ZVS full-bridge designs.
Technical Context
The LTC3722HGN-1 implements adaptive ZVS using DirectSense™ technology with independent turn-on delay per MOSFET, eliminating dependency on external component tolerances. Its phase modulator accepts CS input for current sensing (300mV pulse-by-pulse threshold) and COMP voltage (1.204V FB reference) to regulate duty cycle between 0.5% and 98.5%.
It integrates a 5V/5mA VREF output, 10.25V VCC UVLO with 4.2V hysteresis, and dual-mode ZVS control-adaptive (via SBUS, ADLY, PDLY) or fixed (via resistor-programmed delays). The device uses a 24-pin GN package with separate PGND/GND planes and supports synchronous rectifier timing via SPRG-programmed turn-off delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 10.25V turn-on ensures stable startup before internal regulation engages; prevents erratic operation during brownout. |
| Operating Junction Temp | –40°C to 150°C rating enables deployment in high-ambient industrial and telecom base station environments. |
| Oscillator Frequency | 250kHz typical (215–285kHz total variation) sets switching period for transformer sizing and EMI filtering. |
| Output Driver Current | ±100mA per OUTx pin drives gate drivers like LTC4440 without external buffers, reducing layout complexity. |
| FB Regulation Voltage | 1.204V ±32mV at FB pin enables accurate secondary-side voltage feedback for isolated 12V output regulation. |
| Start-Up Current | 230µA max ensures low-power sequencing in multi-rail systems where VCC ramp rate is constrained. |
| Synchronous Rectifier Timing | SPRG-programmable turn-off delay optimizes dead-time for OUTF/OUTE, minimizing conduction loss in secondary-side FETs. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN), 0.15mm lead pitch, –40°C to 150°C operating range, θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA, OUTC | High-side active/passive leg drivers | Drive external high-side gate drivers (e.g., LTC4440) for primary-side MOSFETs A/C; referenced to PGND. |
| OUTB, OUTD | Low-side active/passive leg drivers | Directly drive ground-referenced MOSFETs B/D; 50mA sink/source capability supports fast turn-on/turn-off. |
| OUTE, OUTF | Synchronous rectifier drivers | Control secondary-side FETs; timing set by SPRG resistor to minimize reverse recovery losses. |
| CS | Current sense input | Accepts shunt voltage; triggers 300mV pulse-by-pulse limit and 650mV overload shutdown for primary-side protection. |
| ADLY, PDLY | ZVS delay inputs | In adaptive mode: voltage-divided bridge-leg signals; in fixed mode: 0–2.5V sets precise turn-on delay for active/passive legs. |
| SBUS | Line voltage sense | 1.5V nominal at VIN mid-point enables adaptive ZVS; tied to VREF for fixed-mode operation. |
| VREF | 5V reference output | Stable 5.00V ±75mV source powers external circuitry (e.g., DPRG divider); load-regulated to 15mV over 100µA–5mA. |
| UVLO | System undervoltage lockout | 5.0V threshold with 10µA hysteresis current allows resistor-divider programming of system turn-on/off voltages. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive ZVS with timeout | DirectSense™ circuitry dynamically adjusts MOSFET turn-on delay per cycle using SBUS/ADLY/PDLY, ensuring ZVS across full load range without manual trimming. |
| Programmable leading edge blanking | RLEB resistor (10k–100kΩ) sets 40–310ns blanking window on CS, suppressing noise-induced false current-limit trips during switching transitions. |
| Peak current mode control | LTC3722HGN-1 variant uses COMP-based current-loop regulation with programmable slope compensation, improving transient response and stability vs. voltage mode. |
| Integrated 5V LDO and shunt regulator | VREF supplies 5V/5mA; VCC self-regulates at 10.3V with 25mA shunt capability, enabling single-supply biasing without external regulators. |
| Soft-start with fault recovery | SS capacitor ramps current command; under overload, SS discharges to restart soft-start, preventing latch-up during short-circuit events. |
Applications
| Telecom Rectifier Modules | Server PSU Main Converter |
|---|---|
Use Scenario: 48V input to 12V/20A output in distributed power architecture for blade servers. IC Role / Device Role / Timing Role: LTC3722HGN-1 controls full-bridge primary switches and synchronous rectifiers, implementing adaptive ZVS to maintain >94% efficiency at 50% load. Use Value: 150°C rating allows operation in confined chassis with minimal airflow; programmable UVLO prevents brownout-induced reset during grid fluctuations. |
Use Scenario: High-density 72V input to 12V/240W output in redundant AC/DC front-end supplies. IC Role / Device Role / Timing Role: LTC3722HGN-1 manages phase-shifted PWM timing, current-mode loop stability, and ZVS delay for four primary MOSFETs and two secondary SRs. Use Value: 230µA start-up current enables reliable cold-start from backup batteries; integrated slope compensation eliminates external op-amp circuitry. |
| Industrial 48V DC Power Distribution | Base Station RF Power Amplifier Supply |
Use Scenario: 36–72V wide-input converter powering PLC I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: LTC3722HGN-1 executes fixed ZVS mode (SBUS = VREF) with resistor-programmed ADLY/PDLY delays for predictable timing in noisy EMI environments. Use Value: Dual GND/PGND separation minimizes noise coupling into current-sense path; RLEB blanking rejects conducted EMI on CS line. |
Use Scenario: 48V-to-28V ZVS full-bridge supplying GaN PA stages requiring tight voltage regulation and low ripple. IC Role / Device Role / Timing Role: LTC3722HGN-1 regulates output via FB pin, programs synchronous rectifier timing via SPRG, and enforces hiccup-mode protection during PA fault conditions. Use Value: 1.204V FB reference enables <±1% output accuracy; 50mA OUTx drivers interface directly with GaN gate drivers without level-shifting. |
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 |
|---|---|---|---|
| UCC3895PW | Voltage-mode only; no adaptive ZVS; 100°C max junction temp; requires external slope compensation. | Lacks DirectSense™ ZVS tuning; suitable for fixed-frequency, lower-temp applications where adaptive timing isn't required. | Select UCC3895PW when cost sensitivity outweighs ZVS optimization needs and ambient temperature stays below 100°C. |
| LTC3722IGN-1 | Same architecture and pinout; rated for –40°C to 85°C junction, not 150°C; identical electrical specs except ICCST (145µA vs. 230µA). | Valid for commercial/industrial ambient but unsuitable for high-temp base station or enclosed power module use. | Choose LTC3722IGN-1 only if thermal margin permits and lifecycle assurance for 150°C operation is unnecessary. |
Compared with UCC3895PW and LTC3722IGN-1, the LTC3722HGN-1 uniquely combines 150°C operation, adaptive ZVS, and integrated slope compensation-enabling higher power density and reliability in thermally constrained telecom and industrial systems without external timing or compensation components.
Availability
LTC3722HGN-1 is available at Aetrix Electronics and suitable for telecom rectifier modules, server PSU main converters, and industrial 48V DC power distribution systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3722HGN-1 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, communications, and power management markets.
The LTC3722 product line delivers robust, high-efficiency phase-shift PWM control for ZVS full-bridge converters targeting telecom infrastructure, server power, and industrial DC distribution where thermal resilience and adaptive timing are critical.
FAQ
What is the maximum operating junction temperature for the LTC3722HGN-1?
The LTC3722HGN-1 is specified for operation from –40°C to 150°C junction temperature, with guaranteed performance across this range. This rating enables deployment in high-ambient environments such as sealed telecom enclosures or industrial power modules where heatsinking is limited. Thermal derating begins above 125°C per Analog Devices' reliability guidelines, and θJA = 100°C/W must be respected in PCB layout.
How does the LTC3722HGN-1 implement adaptive zero-voltage switching?
The LTC3722HGN-1 uses DirectSense™ adaptive ZVS by monitoring SBUS (line voltage), ADLY (active leg), and PDLY (passive leg) to dynamically adjust MOSFET turn-on delays per switching cycle. This eliminates reliance on fixed timing or external trim components, ensuring ZVS across full load and input voltage ranges. The adaptive algorithm is implemented entirely within the IC's analog circuitry without firmware or digital control.
Can the LTC3722HGN-1 be used in voltage-mode control applications?
No-the LTC3722HGN-1 is the current-mode variant (LTC3722-1 family) and lacks the RAMP pin and voltage-mode error amplifier architecture of the LTC3722-2. Attempting voltage-mode operation would result in incorrect phase modulation and instability. For voltage-mode ZVS control, select LTC3722HGN-2 instead, which shares the same package and temperature rating but features different internal signal routing and pinout.
What is the purpose of the RLEB pin on the LTC3722HGN-1?
The RLEB pin on the LTC3722HGN-1 sets leading edge blanking time for the CS current sense input using an external resistor (10kΩ–100kΩ). This blanks the CS comparator for 40–310ns after each switch transition, preventing false triggering from gate-drive-induced noise spikes. Unlike the LTC3722-2, which has fixed 80ns blanking, the LTC3722HGN-1's programmable blanking improves noise immunity in high-dV/dt full-bridge layouts.
Does the LTC3722HGN-1 support synchronization with external clock sources?
Yes-the SYNC pin (Pin 1) accepts CMOS/TTL-compatible external clock signals (1.6–2.2V threshold) to synchronize the internal oscillator. When driven, the LTC3722HGN-1 locks its switching frequency to half the external SYNC frequency, enabling coherent multi-phase operation or EMI reduction through clock dithering. Internal oscillator accuracy remains ±10% without SYNC, but sync operation ensures precise frequency alignment across multiple converters.
LTC3722HGN-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3722HGN-1 FAQ
1.How can I place an order for LTC3722HGN-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3722HGN-1 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 LTC3722HGN-1 reliable?
The price and inventory of LTC3722HGN-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3722HGN-1 is usually 5 days.
3.What payment methods are accepted for LTC3722HGN-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3722HGN-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3722HGN-1?
LTC3722HGN-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3722HGN-1 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 LTC3722HGN-1?
For technical support, including LTC3722HGN-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3722HGN-1 requirements.
6.How does Aetrix verify that LTC3722HGN-1 is sourced from the original manufacturer or authorized distributors?
All LTC3722HGN-1 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 LTC3722HGN-1 meets industry standards.
7.What is the process for return or replacement of LTC3722HGN-1?
All LTC3722HGN-1 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3722HGN-1, 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 LTC3722HGN-1 part is unused and in its original packaging.
Return procedure for LTC3722HGN-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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