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Analog Devices Inc. LTC3722IGN-1
- Part No.:
- LTC3722IGN-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3722IGN-1.pdf
- Description:
- IC POWER MANAGEMENT
- Quantity:
- Payment:
- Shipping:
Inventory:1,560
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Product details
Overview
LTC3722IGN-1 from Analog Devices is a synchronous dual-mode phase-modulated full-bridge PWM controller optimized for zero-voltage-switched (ZVS) DC/DC converters. It implements peak current mode control with programmable slope compensation and leading edge blanking, delivers ±100mA gate drive per output (OUTA–OUTF), supports 225–275kHz oscillator frequency (CT = 270pF), and operates across –40°C to 85°C in a 24-pin SSOP package - enabling high-efficiency telecom and server power supplies.
For engineers reviewing the LTC3722IGN-1 datasheet, LTC3722IGN-1 pinout, LTC3722IGN-1 application, or LTC3722IGN-1 equivalent, this page provides verified functional identity, adaptive/manual ZVS delay configuration, synchronous rectifier timing control, UVLO hysteresis programming, and confirmed 24-pin GN package mapping - all specific to the LTC3722IGN-1 variant.
Technical Context
The LTC3722IGN-1 integrates a peak current mode phase modulator with programmable slope compensation (30–68µA at CT = 1–2.25V) and 300mV pulse-by-pulse current limit threshold on CS. Its adaptive ZVS circuitry independently delays MOSFET turn-on using SBUS, ADLY, and PDLY inputs, while manual delay mode enables secondary-side control via fixed voltage programming.
It features a 5V reference (±1.5% initial accuracy, 4.900–5.100V total variation), 10.25V VCC UVLO with 3.8–4.2V hysteresis, and six 50mA gate drivers (OUTA–OUTF) with 0.6–1V low-state voltage and 7.9–8.4V high-state voltage at –50mA load - all validated for operation in 24-pin narrow SSOP (GN) package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 225–275kHz typical (CT = 270pF); sets base switching period for full-bridge topology |
| VCC UVLO Threshold | 10.25–10.5V turn-on; ensures stable startup before internal regulation engages |
| Current Sense Threshold | 300mV pulse-by-pulse limit; directly protects primary MOSFETs against overcurrent |
| Synchronous Rectifier Drive | OUTE/OUTF deliver 50mA each; timed for optimal secondary-side FET conduction |
| Reference Voltage Accuracy | 4.925–5.075V at 25°C; enables precise feedback loop calibration for 1.204V FB setpoint |
| Phase Shift Range | 0.5–98.5% duty overlap; controls effective converter duty cycle and output regulation |
| Start-Up Current | 145µA max (I-grade); minimizes auxiliary supply burden during cold start |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN), surface-mount, –40°C to 85°C operating junction temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA, OUTB, OUTC, OUTD | Full-bridge gate drivers | Drive high/low side MOSFETs of passive/active legs; ±100mA capable, 0.6–8.4V swing |
| OUTE, OUTF | Synchronous rectifier drivers | Control secondary-side FETs; programmable turn-off delay via SPRG resistor |
| CS | Current sense input | Accepts shunt voltage; triggers 300mV pulse-by-pulse limit and 650mV overload shutdown |
| FB | Error amplifier inverting input | Regulates output by comparing against 1.204V internal reference |
| ADLY, PDLY, SBUS | ZVS delay control inputs | Enable adaptive (voltage-sense) or fixed-delay ZVS; SBUS = 1.5V nominal for adaptive mode |
| UVLO | System undervoltage lockout | Programs turn-on/off thresholds via external divider; sources 10µA for hysteresis |
| COMP | Error amplifier output | Drives phase modulator; 400–800µA source / 2–5mA sink capability |
| VREF | 5V precision reference output | Supplies up to 18mA; decoupled with 1µF ceramic capacitor to PGND |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive ZVS with timeout | Eliminates external trim components and guarantees soft-switching across load range using SBUS/ADLY/PDLY sensing |
| Programmable synchronous rectifier timing | SPRG resistor sets turn-off delay for OUTE/OUTF - optimizes secondary-side FET conduction window |
| Leading edge blanking (LEB) | RLEB resistor (10–100kΩ) programs 40–310ns blanking on CS - suppresses noise-induced false current limiting |
| Peak current mode control | Includes slope compensation (ISLP = 30–68µA) and leading edge blanking - stabilizes loop under wide VIN/VOUT conditions |
| Low quiescent current | 145µA start-up and 5–8mA operating current - reduces standby losses in always-on infrastructure systems |
Applications
| Telecom Power Supply | Server VRM |
|---|---|
|
Use Scenario: 36–72V input telecom rectifier delivering 12V/20A output with >95% efficiency at full load. IC Role / Device Role / Timing Role: LTC3722IGN-1 controls ZVS full-bridge primary and times synchronous rectifiers on secondary side. Use Value: Adaptive ZVS maintains soft-switching down to 10% load, reducing MOSFET switching loss and EMI. |
Use Scenario: High-density 48V-to-12V intermediate bus converter in rack-mounted server PSU. IC Role / Device Role / Timing Role: LTC3722IGN-1 implements phase-shifted PWM with programmable slope compensation for stable current-mode control. Use Value: 225–275kHz operation enables compact magnetics; ±100mA drivers interface directly with gate driver ICs like LTC4440. |
| Distributed Power Architecture | Industrial Isolated DC/DC |
|
Use Scenario: 48V input isolated 5V/30A point-of-load converter feeding FPGA and ASIC rails. IC Role / Device Role / Timing Role: LTC3722IGN-1 manages active/passive leg timing and synchronizes rectifier turn-off via SPRG. Use Value: Fixed ZVS mode (SBUS = VREF) simplifies design for secondary-side control in distributed architectures. |
Use Scenario: Ruggedized 24–60V input industrial DC/DC module requiring –40°C to 85°C operation and hiccup-mode fault protection. IC Role / Device Role / Timing Role: LTC3722IGN-1 provides cycle-by-cycle current limiting, soft-start, and UVLO with hysteresis. Use Value: 145µA start-up current and 10.25V VCC UVLO ensure reliable cold-start in brownout-prone environments. |
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 |
|---|---|---|---|
| UCC3895PW | Voltage-mode only; no adaptive ZVS; 100mA drivers; 100–1000kHz range | Lacks integrated adaptive ZVS and synchronous rectifier timing - requires external circuits for soft-switching | Choose UCC3895PW when cost-sensitive designs accept added complexity for fixed-frequency voltage-mode control. |
| LTC3722IGN-2 | Voltage-mode control (vs. LTC3722IGN-1's peak current mode); identical pinout and ZVS architecture | Used where loop stability favors voltage-mode over current-mode; same thermal and layout footprint | Select LTC3722IGN-2 when system-level compensation prefers voltage-mode architecture without changing PCB layout. |
Compared with UCC3895PW and LTC3722IGN-2, the LTC3722IGN-1 uniquely combines peak current mode control, adaptive ZVS, and programmable synchronous rectifier timing in a single 24-pin SSOP package - reducing external component count and improving light-load efficiency in telecom and server power.
Availability
LTC3722IGN-1 is available at Aetrix Electronics and suitable for telecom rectifiers, server VRMs, and industrial isolated DC/DC converters requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to 85°C performance.
Supply support for LTC3722IGN-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 (now part of Analog Devices, Inc., formerly Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3722 family was designed specifically for zero-voltage-switched full-bridge DC/DC converters in telecom and server infrastructure - emphasizing adaptive ZVS, low quiescent current, and integrated synchronous rectifier control.
FAQ
What is the key functional difference between LTC3722IGN-1 and LTC3722IGN-2?
The LTC3722IGN-1 uses peak current mode control with programmable slope compensation and leading edge blanking, while the LTC3722IGN-2 employs voltage mode control. Both share identical pinout, ZVS architecture, and 24-pin GN package - making them drop-in replacements except for control-loop implementation. The LTC3722IGN-1 is preferred for faster transient response and inherent current limiting; the LTC3722IGN-2 suits designs favoring simpler voltage-mode compensation. Both variants are fully supported in the same LTC3722IGN-1 datasheet.
Does LTC3722IGN-1 support adaptive zero-voltage switching (ZVS) without external microcontrollers?
Yes, LTC3722IGN-1 implements fully autonomous adaptive ZVS using its SBUS, ADLY, and PDLY pins - no microcontroller or firmware required. SBUS senses line voltage via resistive divider; ADLY and PDLY monitor bridge-leg node voltages to dynamically adjust turn-on delays for active and passive legs. This DirectSense™ technology eliminates external trim components and maintains ZVS across 10–100% load range in properly designed magnetics. The LTC3722IGN-1 datasheet confirms adaptive ZVS operation is intrinsic to the device's analog control architecture.
What is the maximum gate drive current capability of LTC3722IGN-1 outputs?
LTC3722IGN-1 provides six dedicated gate drivers: OUTA–OUTD deliver ±100mA each for full-bridge primary switches, while OUTE and OUTF supply ±50mA each for synchronous rectifiers. Measured output low voltage is 0.6–1.0V at 50mA sink, and output high voltage is 7.9–8.4V at 50mA source - confirming robust drive strength for standard gate driver ICs like LTC4440. These ratings are specified across –40°C to 85°C and validated in the LTC3722-1/LTC3722-2 datasheet Rev C absolute maximum and electrical characteristics tables.
How is system undervoltage lockout (UVLO) programmed on LTC3722IGN-1?
UVLO is programmed externally via a resistor divider from input voltage to the UVLO pin. The LTC3722IGN-1's internal comparator trips at 4.8–5.2V (typical 5.0V), and a 10µA (nominal) current flows out of UVLO to set hysteresis - allowing independent adjustment of turn-on and turn-off thresholds. For example, a 100kΩ top resistor and 10kΩ bottom resistor yields ~4.55V turn-on and ~4.1V turn-off. This method is explicitly documented in the "PIN FUNCTIONS" section and electrical characteristics table (SUVLO, SHYST) of the LTC3722-1/LTC3722-2 datasheet.
Can LTC3722IGN-1 operate with a 48V input and deliver 12V/20A output?
Yes - the LTC3722IGN-1 is validated for 36–72V input in the typical 12VOUT, 240W converter application (Figure TA01a). With proper external MOSFETs, gate drivers (e.g., LTC4440), transformer design, and ZVS tuning, it achieves >95% efficiency at full load. Key enablers include adaptive ZVS for reduced switching loss, programmable synchronous rectifier timing for secondary-side optimization, and 225–275kHz operation enabling compact magnetics. This use case is explicitly demonstrated in the LTC3722-1/LTC3722-2 datasheet's Typical Application section.
LTC3722IGN-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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3722IGN-1 FAQ
1.How can I place an order for LTC3722IGN-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3722IGN-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 LTC3722IGN-1 reliable?
The price and inventory of LTC3722IGN-1 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 is usually 5 days.
3.What payment methods are accepted for LTC3722IGN-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3722IGN-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3722IGN-1?
LTC3722IGN-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3722IGN-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 LTC3722IGN-1?
For technical support, including LTC3722IGN-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3722IGN-1 requirements.
6.How does Aetrix verify that LTC3722IGN-1 is sourced from the original manufacturer or authorized distributors?
All LTC3722IGN-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 LTC3722IGN-1 meets industry standards.
7.What is the process for return or replacement of LTC3722IGN-1?
All LTC3722IGN-1 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3722IGN-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 LTC3722IGN-1 part is unused and in its original packaging.
Return procedure for LTC3722IGN-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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