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Analog Devices Inc. LTC3723EGN-2#PBF
- Part No.:
- LTC3723EGN-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3723EGN-2#PBF.pdf
- Description:
- IC REG CTRLR PUSH-PULL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC3723EGN-2#PBF from Analog Devices (formerly Linear Technology) is a voltage-mode synchronous push-pull PWM controller IC designed for isolated DC/DC converters. It delivers 1.5A sink / 1A source gate drive on DRVA/DRVB, supports programmable dead-time (90–300ns), operates up to 1MHz oscillator frequency (500kHz switching), and integrates a 5V/15mA LDO, 10.25V VCC shunt regulator, and system UVLO with 5.0V threshold - enabling robust telecom and infrastructure power systems.
For engineers reviewing the LTC3723EGN-2#PBF datasheet, LTC3723EGN-2#PBF pinout, LTC3723EGN-2#PBF application, or LTC3723EGN-2#PBF equivalent, key selection criteria include its voltage-mode control architecture (vs. LTC3723-1's current mode), RAMP pin interface for feedforward timing, absence of slope compensation circuitry, fixed 80ns leading edge blanking, and compatibility with push-pull, forward, and half-bridge topologies requiring precise duty-cycle control and synchronous rectifier timing.
Technical Context
The LTC3723EGN-2#PBF implements voltage-mode PWM control using an internal ramp generator referenced to the CT pin or an external R-C network on the RAMP pin, enabling input-voltage feedforward for improved line regulation. Its error amplifier drives COMP to modulate duty cycle against this ramp, with open-loop gain of 70–90dB and FB input regulated at 1.20V ±2mV over temperature.
Unlike the LTC3723-1, it omits slope compensation and programmable leading edge blanking (fixed 80ns), and replaces the RLEB pin with RAMP (Pin 9) for timing signal injection. The device uses a 16-pin SSOP package with dedicated synchronous rectifier drivers (SDRA/SDRB), independent SPRG-based turn-off delay programming, and dual UVLO thresholds - one for VCC (10.25V turn-on) and one for system-level input monitoring (5.0V threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Threshold | 10.25V turn-on ensures stable bias startup before switching begins; 6V hold-up allows operation under brownout. |
| System UVLO Threshold | 5.0V ±0.2V on UVLO pin enables precise input feed enable/disable with 10µA hysteresis current. |
| Oscillator Frequency | Up to 1MHz (CT-based); output drivers switch at half-frequency (max 500kHz), supporting high-density isolated designs. |
| Push-Pull Dead-Time | Programmable 90–300ns via resistor from DPRG to VREF; prevents shoot-through in transformer-coupled topologies. |
| Synchronous Driver Output | 50mA sink/source per SDRA/SDRB; supports external MOSFETs with adjustable turn-off delay via SPRG resistor. |
| Reference Voltage | 5.000V ±10mV over –40°C to 85°C; powers external circuitry and sets UVLO divider accuracy. |
| Error Amplifier FB Input | 1.200V ±2mV regulation point; defines output voltage setpoint in closed-loop configurations. |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 0.150" wide, JEDEC MO-153 compliant, θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (1) | 5V reference output | Stable 5.0V supply for external biasing and UVLO divider; capable of 18mA load. |
| SDRB (2) | Synchronous rectifier driver B | 50mA gate driver for secondary-side MOSFET paired with DRVB; turn-off delay set by SPRG. |
| SDRA (3) | Synchronous rectifier driver A | 50mA gate driver for secondary-side MOSFET paired with DRVA; independent timing control. |
| DRVB (4) | Push-pull driver B | 1.5A sink / 1A source totem-pole output; drives low-side MOSFET in push-pull or forward topology. |
| VCC (5) | Bias supply input | Accepts 4–10V; internal 10.25V shunt regulator provides self-bias and UVLO signaling. |
| DRVA (6) | Push-pull driver A | 1.5A sink / 1A source totem-pole output; 180° out-of-phase with DRVB; max 50% duty cycle. |
| GND (7) | Analog/digital ground reference | Common return for all internal circuits; requires star grounding near bypass capacitors. |
| CT (8) | Oscillator timing capacitor | Connects to 2.35V p-p ramp; sets oscillator frequency; CT = 1/(14.8k·fOSC) for fOSC ≤ 1MHz. |
| RAMP (9) | Voltage-mode timing input | Replaces RLEB on LTC3723-1; accepts external ramp for feedforward; internally level-shifted by 650mV. |
| CS (10) | Current sense input | 300mV pulse-by-pulse limit threshold; no slope compensation - used only for overload detection. |
| COMP (11) | Error amplifier output | Drives PWM comparator; sets duty cycle vs. RAMP or CT ramp; open-loop gain 70–90dB. |
| FB (13) | Feedback input | Inverting input of error amp; regulates output to 1.20V; supports resistive divider for VOUT scaling. |
| SS (14) | Soft-start timing | 13µA charging current; controls startup ramp; discharges during fault for hiccup-mode recovery. |
| UVLO (15) | System undervoltage lockout | 5.0V threshold enables/disables converter; 10µA hysteresis current sets turn-off hysteresis. |
| SPRG (16) | Synchronous rectifier delay | Resistor-to-GND sets turn-off delay for SDRA/SDRB; optimizes body-diode conduction loss. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-mode control | Enables input-voltage feedforward via RAMP pin, improving transient response and line regulation without slope compensation. |
| Programmable dead-time | External resistor on DPRG sets 90–300ns non-overlap between DRVA/DRVB, preventing transformer saturation and shoot-through. |
| Dual UVLO protection | Independent VCC (10.25V) and system (5.0V) lockouts ensure safe startup and graceful shutdown across varying input conditions. |
| Integrated 5V LDO | 15mA low-dropout regulator powers external circuitry and references UVLO divider, eliminating need for auxiliary bias rail. |
| Synchronous rectifier timing | SPRG-programmable turn-off delay minimizes reverse conduction loss in secondary-side MOSFETs for >90% efficiency. |
Applications
| Telecom Power Supply | Industrial Isolated DC/DC |
|---|---|
Use Scenario: 48V input telecom rectifier supplying 12V/20A to base station RF modules with strict efficiency and thermal constraints. IC Role / Device Role / Timing Role: LTC3723EGN-2#PBF acts as primary-side voltage-mode PWM controller driving push-pull MOSFETs; RAMP pin accepts feedforward signal from input bus for dynamic duty adjustment. Use Value: Achieves >92% peak efficiency at full load with programmable dead-time preventing core saturation and SPRG-tuned synchronous rectification reducing secondary conduction loss. | Use Scenario: 24–72V industrial input powering isolated 5V/10A logic rails in PLC backplanes with EMI-sensitive analog sections. IC Role / Device Role / Timing Role: LTC3723EGN-2#PBF configures as forward converter with LTC4440 high-side driver; UVLO pin monitors main DC feed for graceful brownout response. Use Value: Dual UVLO thresholds (VCC + system) ensure reliable startup under weak auxiliary windings and controlled shutdown during input dips, meeting IEC 61000-4-29 immunity requirements. |
| Medical Imaging Power | Server VRM Auxiliary Bias |
Use Scenario: Isolated 3.3V/30A supply for digital detector ASICs in portable X-ray units requiring low-noise, low-EMI operation. IC Role / Device Role / Timing Role: LTC3723EGN-2#PBF operates in half-bridge mode with synchronous rectifiers; CT pin sets 350kHz switching to balance efficiency and EMI filter size. Use Value: Fixed 80ns leading edge blanking eliminates noise-induced false triggering on CS, while 5V VREF powers precision ADC reference circuits without added regulators. | Use Scenario: Auxiliary 12V-to-5V isolated bias supply for server motherboard VRM controllers, requiring fast transient response and tight load regulation. IC Role / Device Role / Timing Role: LTC3723EGN-2#PBF implements single-ended forward topology; FB pin closes loop on 5V output; COMP drives optocoupler feedback path. Use Value: 1.20V FB reference tolerance (±2mV) enables ±0.5% output regulation; soft-start current (13µA) ensures monotonic 5V ramp without overshoot during cold boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-mode PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2897A | Voltage-mode controller with integrated 5V/100mA LDO; no RAMP pin - uses CT-derived ramp; 100V start-up capability. | Supports higher input voltages (up to 100V) without external bias; lacks programmable synchronous rectifier delay (SPRG). | Select UCC2897A when direct high-voltage startup is required and SPRG-level rectifier optimization is unnecessary. |
| LTC3722-2 | Pin-compatible predecessor with identical voltage-mode architecture; lower max oscillator frequency (600kHz vs. 1MHz) and no RAMP pin - relies solely on CT ramp. | Same footprint and basic feature set but limited switching speed; suitable for cost-sensitive legacy upgrades where 500kHz suffices. | Choose LTC3722-2 only if board space reuse is critical and 1MHz operation is not needed. |
Compared with UCC2897A and LTC3722-2, the LTC3723EGN-2#PBF uniquely combines RAMP-based feedforward flexibility, 1MHz-capable oscillator, and SPRG-programmable synchronous timing - making it optimal for high-efficiency, thermally constrained isolated supplies where input line dynamics and secondary-side loss minimization are prioritized.
Availability
LTC3723EGN-2#PBF is available at Aetrix Electronics and suitable for telecom infrastructure power systems, industrial isolated DC/DC converters, and medical imaging power supplies requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 85°C.
Supply support for LTC3723EGN-2#PBF 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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, power, and reliability-critical applications.
The LTC3723-2 product line was engineered for high-efficiency isolated power conversion in space-constrained telecom and industrial systems, emphasizing voltage-mode control stability, flexible synchronization, and integrated gate drive for push-pull and forward topologies.
FAQ
What is the key functional difference between LTC3723EGN-2#PBF and LTC3723EGN-1#PBF?
The LTC3723EGN-2#PBF uses voltage-mode control with a dedicated RAMP pin for external feedforward timing, while the LTC3723EGN-1#PBF uses peak current-mode control with slope compensation and programmable leading edge blanking. The LTC3723EGN-2#PBF omits slope compensation circuitry and fixes blanking at 80ns, simplifying design for applications where line regulation dominates over current-loop stability.
Does LTC3723EGN-2#PBF support synchronization to an external clock source?
Yes, LTC3723EGN-2#PBF supports external synchronization: applying a clean TTL/CMOS clock to the CT pin forces the internal oscillator to align with the external frequency, provided fEXT is between fOSC and 1.25×fOSC. This enables phase-aligned operation in multi-rail systems and reduces beat-frequency EMI.
What is the maximum recommended operating temperature for LTC3723EGN-2#PBF?
The LTC3723EGN-2#PBF is rated for continuous operation from –40°C to 85°C ambient temperature. Its thermal shutdown activates at TJ = 125°C, and with θJA = 100°C/W, it requires ≤400mW dissipation in still air to remain within spec - achievable with proper PCB copper area and minimal gate-drive losses.
Can LTC3723EGN-2#PBF be used in a flyback topology?
Yes, LTC3723EGN-2#PBF can implement flyback via single-ended operation: tie DRVB to GND and use DRVA as the active switch driver, with UVLO and FB providing regulation. Duty cycle remains <50% unless modified with external timing tricks (e.g., Figure 7 in datasheet), and synchronous rectification on the secondary is fully supported via SDRA/SDRB.
What is the purpose of the SPRG pin on LTC3723EGN-2#PBF?
The SPRG pin on LTC3723EGN-2#PBF programs the turn-off delay for synchronous rectifier drivers SDRA and SDRB. A resistor from SPRG to GND sets the delay (typically 50–350ns), allowing precise timing to minimize reverse conduction loss in secondary MOSFETs - critical for achieving >93% efficiency at low output voltages like 3.3V or 5V.
LTC3723EGN-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -
- Duty Cycle (Max):
- 50%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- 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:
- 16-SSOP
LTC3723EGN-2#PBF FAQ
1.How can I place an order for LTC3723EGN-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3723EGN-2#PBF 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 LTC3723EGN-2#PBF reliable?
The price and inventory of LTC3723EGN-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3723EGN-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3723EGN-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3723EGN-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3723EGN-2#PBF?
LTC3723EGN-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3723EGN-2#PBF 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 LTC3723EGN-2#PBF?
For technical support, including LTC3723EGN-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3723EGN-2#PBF requirements.
6.How does Aetrix verify that LTC3723EGN-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3723EGN-2#PBF 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 LTC3723EGN-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3723EGN-2#PBF?
All LTC3723EGN-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3723EGN-2#PBF, 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 LTC3723EGN-2#PBF part is unused and in its original packaging.
Return procedure for LTC3723EGN-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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