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Analog Devices Inc. LTC3721EGN-1#TRPBF
- Part No.:
- LTC3721EGN-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3721EGN-1#TRPBF.pdf
- Description:
- IC REG CTRLR PUSH-PULL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,624
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Product details
Overview
LTC3721EGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency push-pull PWM controller IC for isolated DC/DC power converters, featuring peak current mode control, 1.5A sink / 1A source gate drivers, programmable dead-time (90–300ns), and integrated 5V reference with ±1% initial accuracy. It operates from –40°C to 85°C in 16-pin SSOP packaging and targets telecom infrastructure and high-density server power supplies.
For engineers reviewing the LTC3721EGN-1#TRPBF datasheet, LTC3721EGN-1#TRPBF pinout, LTC3721EGN-1#TRPBF application, or LTC3721EGN-1#TRPBF equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options - all grounded in official Linear Technology documentation and product specifications.
Technical Context
The LTC3721EGN-1#TRPBF implements fixed-frequency, pulse-by-pulse peak current mode control with independent slope compensation via external resistor on CS and leading edge blanking programmed by RLEB (40–320ns). Its oscillator generates a 2.35Vpp ramp on CT, enabling up to 1MHz frequency (driver outputs switch at half that rate).
It integrates dual 180° out-of-phase totem-pole drivers (DRVA/DRVB), a 10.25V VCC shunt regulator with 4.2V hysteresis, system UVLO programming via UVLO pin (5.0V threshold, 10µA hysteresis current), and hiccup-mode short-circuit protection triggered at 600mV CS overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 10.25V (enables chip operation; ensures stable bias before switching) |
| Max Oscillator Frequency | 1MHz (CT-based; driver outputs run at 500kHz max - critical for transformer size and EMI) |
| Driver Output Capability | 1.5A sink / 1A source (directly drives low-side N-MOSFET gates without external buffers) |
| Reference Voltage Accuracy | ±1% over temperature (5.000V ±10mV total variation - enables precise FB regulation at 1.2V) |
| Dead-Time Range | 90–300ns (programmed via DPRG–VREF resistor - prevents shoot-through in push-pull stage) |
| Start-Up Current | 145µA typical (allows use of high-value trickle-charge resistors for auxiliary winding bias) |
| Operating Temperature | –40°C to +85°C (fully specified performance across industrial range) |
Pinout & Package
Package: 16-pin plastic SSOP (GN), 0.150" narrow body, exposed pad not present (unlike QFN variant). Pin 1 = VREF; Pin 16 = DPRG; Pin 7 = GND; Pin 17 is not present - GN package has 16 pins only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | 5.0V precision reference output | Supplies up to 18mA; decoupled with 1µF ceramic; used to bias DPRG, RLEB, and feedback dividers |
| DRVA (Pin 6) | High-speed MOSFET gate driver A | 1.5A sink / 1A source; drives one side of push-pull primary; requires short PCB trace to MOSFET gate |
| DRVB (Pin 4) | High-speed MOSFET gate driver B | 180° out-of-phase with DRVA; identical drive strength; enables balanced transformer utilization |
| CS (Pin 10) | Current sense input & slope compensation node | Accepts voltage from sense resistor; hosts internal 300mV pulse-by-pulse and 600mV shutdown comparators |
| DPRG (Pin 9) | Dead-time programming input | 2V nominal bias; resistor to VREF sets dead-time (90–300ns); limits shoot-through risk during max duty cycle |
| RLEB (Pin 12) | Leading edge blanking timing input | 10k–100k to GND programs 40–320ns blanking; suppresses switching noise on CS during MOSFET turn-on |
| UVLO (Pin 15) | System undervoltage lockout input | 5.0V threshold; enables soft-start when exceeded; sources 10µA for hysteresis programming via divider |
| GND (Pin 7) | Main signal ground reference | All internal circuits referenced here; star-point connection recommended for VIN/VREF bypass caps |
Key Features
| Feature | Design Value |
|---|---|
| Programmable push-pull dead-time | Adjustable 90–300ns via single resistor - eliminates need for external timing logic or matched gate delays |
| Integrated 5V reference with load regulation | ±15mV load regulation (100µA–5mA) - supports stable feedback divider biasing across load transients |
| Hiccup-mode short-circuit protection | Auto-retry after SS capacitor discharges to ~0.5V and recharges to ~4V - prevents thermal runaway during sustained overload |
| Single-resistor slope compensation | Current sourced from CT ramp into CS - eliminates need for op-amp circuitry while ensuring stable current-mode loop |
| Low start-up current (145µA) | Enables use of 100kΩ start-up resistor from 36V rail - reduces bias supply losses in telecom systems |
Applications
| Telecom Power Shelf | Server VRM Auxiliary Bias |
|---|---|
Use Scenario: Isolated 48V-to-12V intermediate bus converter in distributed telecom power shelf with strict efficiency and footprint requirements. IC Role / Device Role / Timing Role: Push-pull PWM controller generating complementary 500kHz gate signals with programmable dead-time to drive primary-side MOSFETs. Use Value: High integration (integrated ref, shunt reg, drivers) reduces BOM count by ≥7 discrete parts vs. discrete controller + driver solution. |
Use Scenario: Auxiliary 12V bias supply for server VRM controllers, derived from main transformer auxiliary winding with minimal component count. IC Role / Device Role / Timing Role: Self-biased push-pull controller using VCC shunt regulation and UVLO-programmed startup sequencing. Use Value: 145µA start-up current allows direct derivation from low-power auxiliary winding - no dedicated LDO or charge pump required. |
| Industrial PLC Power Module | Medical Imaging DC/DC Isolation Stage |
Use Scenario: Compact 24V-to-5V isolated module powering I/O interfaces in programmable logic controllers with wide input range and safety isolation. IC Role / Device Role / Timing Role: Peak current mode controller with leading edge blanking (RLEB) enabling robust operation with ground-referenced current sensing. Use Value: Programmable blanking (40–320ns) eliminates need for RC filters on CS - improves transient response and simplifies layout. |
Use Scenario: Galvanically isolated 400V-to-24V converter in portable medical imaging equipment requiring low EMI and high reliability. IC Role / Device Role / Timing Role: Fixed-frequency push-pull controller with soft-start (SS pin) and hiccup-mode fault recovery for patient-safety-critical operation. Use Value: Hiccup-mode protection limits average fault power to <1W during short-circuit - avoids thermal damage and enables safe auto-recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar push-pull PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2897A | Requires external gate drivers; no integrated 5V reference; fixed 100ns dead-time (not adjustable) | Used in higher-power (>500W) telecom rectifiers where driver headroom exceeds LTC3721EGN-1#TRPBF's 1.5A sink capability | Select UCC2897A when needing >2A gate drive or operating above 1MHz with external oscillator sync |
| MAX5069B | Lower drive strength (0.5A sink); no programmable dead-time; only 100kHz–600kHz range; no hiccup-mode protection | Fits cost-sensitive industrial AC/DC adapters where full telecom-grade protection is unnecessary | Choose MAX5069B for sub-100W isolated supplies where board space and BOM cost outweigh advanced protection needs |
Compared with UCC2897A and MAX5069B, the LTC3721EGN-1#TRPBF uniquely combines integrated high-current drivers, adjustable dead-time, hiccup-mode fault recovery, and a precision 5V reference - making it optimal for compact, high-reliability 100–300W isolated DC/DC designs where layout simplicity and thermal safety are prioritized.
Availability
LTC3721EGN-1#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure power systems, server power supplies, and high-density power modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3721EGN-1#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 acquired Linear Technology in 2017 and maintains full product support, datasheet archives, and application engineering for legacy Linear parts including the LTC3721 series.
The LTC3721-1 product line was designed specifically for high-efficiency, isolated push-pull DC/DC converters in space-constrained telecom and server applications - emphasizing integration, thermal resilience, and simplified transformer drive.
FAQ
What is the maximum operating frequency of the LTC3721EGN-1#TRPBF?
The LTC3721EGN-1#TRPBF oscillator supports up to 1MHz, but its DRVA/DRVB outputs switch at half that frequency - i.e., maximum 500kHz. This is due to the push-pull topology requiring complementary 180° phase-shifted signals. The CT pin ramp amplitude remains 2.35Vpp across the full range, and frequency is set by CT = 1/(14.8k × FOSC).
Does the LTC3721EGN-1#TRPBF require an external gate driver?
No, the LTC3721EGN-1#TRPBF does not require an external gate driver. Its integrated DRVA and DRVB outputs deliver 1.5A sink and 1A source capability - sufficient to directly drive standard low-side N-channel MOSFETs in push-pull configurations up to ~300W. Layout best practices (short traces, local 1µF VCC bypass) are essential to maintain signal integrity.
How is dead-time programmed on the LTC3721EGN-1#TRPBF?
Dead-time on the LTC3721EGN-1#TRPBF is programmed by connecting a resistor between DPRG (Pin 9) and VREF (Pin 1). With VREF regulated at 5.0V, this creates a current that sets dead-time from 90ns to 300ns. A 200kΩ resistor to GND may be added to linearize the curve. Floating DPRG yields ~130ns default, per datasheet Figure 1 and Typical Performance Characteristics.
What protection features does the LTC3721EGN-1#TRPBF include?
The LTC3721EGN-1#TRPBF includes pulse-by-pulse current limiting (300mV CS threshold), hiccup-mode short-circuit protection (600mV CS shutdown with SS-based retry), overtemperature shutdown, VCC undervoltage lockout (10.25V turn-on), and system UVLO programming via the UVLO pin. All protections are fully integrated - no external comparators or timers needed.
Is the LTC3721EGN-1#TRPBF pin-compatible with the QFN-packaged LTC3721EUF-1#TRPBF?
No, the LTC3721EGN-1#TRPBF (16-pin SSOP) is not pin-compatible with the LTC3721EUF-1#TRPBF (16-pin 4mm×4mm QFN). While both share identical electrical functionality and pin numbering logic, their physical pinouts differ: GN places GND at Pin 7, whereas UF assigns PGND to Pin 4 and SGND to Pin 5. PCB layout and thermal pad handling are not interchangeable.
LTC3721EGN-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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:
- Push-Pull
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- Up to 10V
- Frequency - Switching:
- Up to 1MHz
- Duty Cycle (Max):
- 50%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3721EGN-1#TRPBF FAQ
1.How can I place an order for LTC3721EGN-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3721EGN-1#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 LTC3721EGN-1#TRPBF reliable?
The price and inventory of LTC3721EGN-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3721EGN-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3721EGN-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3721EGN-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3721EGN-1#TRPBF?
LTC3721EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3721EGN-1#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 LTC3721EGN-1#TRPBF?
For technical support, including LTC3721EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3721EGN-1#TRPBF requirements.
6.How does Aetrix verify that LTC3721EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3721EGN-1#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 LTC3721EGN-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3721EGN-1#TRPBF?
All LTC3721EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3721EGN-1#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 LTC3721EGN-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3721EGN-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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