Analog Devices Inc. LTC3723EGN-1#PBF

Overview

LTC3723EGN-1#PBF from Analog Devices (formerly Linear Technology) is a synchronous push-pull PWM controller IC designed for isolated DC/DC power converters. It implements peak current mode control with programmable slope compensation and leading edge blanking, delivers 1.5A sink / 1A source gate drive on DRVA/DRVB, supports up to 1MHz oscillator frequency (500kHz switching), and operates across –40°C to 85°C in telecom and infrastructure power systems.

For engineers reviewing the LTC3723EGN-1#PBF datasheet, LTC3723EGN-1#PBF pinout, LTC3723EGN-1#PBF application, or LTC3723EGN-1#PBF equivalent, key selection criteria include its 16-pin SSOP package, adjustable dead-time via DPRG, UVLO programmability on UVLO pin, and dual-mode synchronous rectifier timing control via SPRG and RLEB.

Technical Context

The LTC3723EGN-1#PBF integrates a high-accuracy 2.35Vpp CT ramp oscillator, error amplifier with 70–90dB open-loop gain, and dual comparator-based overcurrent protection (300mV pulse-by-pulse, 600mV shutdown). Its peak current mode architecture uses CS as both current sense input and slope compensation node, with ISLP = 30µA (CT = 1V) and CLPP = 300mV typical.

Control logic generates complementary 180° out-of-phase drive signals on DRVA/DRVB with <50% maximum duty cycle, programmable dead-time (90–300ns via RDPRG), and independent synchronous rectifier turn-off delay (via SPRG). The device features a 5V/5mA reference (VREF), 10.25V VCC UVLO with 4.2V hysteresis, and 145µA start-up current enabling trickle-charge bias from auxiliary windings.

Key Specifications

Pinout & Package

Package: 16-lead plastic SSOP (GN), 0.150" wide, JEDEC MO-153 compliant, θJA = 100°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous push-pull controller applications.

Compared with LTC3723EGN-2#PBF, the LTC3723EGN-1#PBF provides superior transient response and inherent stability via peak current mode, while UCC3895PW offers simpler layout at the expense of precision regulation, programmability, and integrated bias management.

Availability

LTC3723EGN-1#PBF is available at Aetrix Electronics and suitable for telecom rectifier modules, distributed power architectures, and industrial PLC power supplies requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.

Supply support for LTC3723EGN-1#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.

The LTC3723 product line was engineered specifically for high-efficiency, isolated synchronous push-pull DC/DC converters in space-constrained telecom and infrastructure applications, emphasizing integration, programmability, and rugged protection features.

FAQ

What is the function of the DPRG pin on the LTC3723EGN-1#PBF?

The DPRG pin on the LTC3723EGN-1#PBF programs the minimum dead-time between DRVA and DRVB output transitions. A resistor connected from DPRG to VREF sets a current that determines dead-time from 90ns to 300ns, preventing shoot-through in push-pull MOSFET bridges. The LTC3723EGN-1#PBF uses this to ensure safe commutation under maximum duty cycle conditions.

Does the LTC3723EGN-1#PBF support synchronous rectification?

Yes, the LTC3723EGN-1#PBF supports synchronous rectification via dedicated SDRA and SDRB outputs capable of 50mA drive. Turn-off timing is independently adjustable using a resistor from SPRG to GND, allowing optimization of conduction loss versus reverse recovery trade-offs in center-tapped or full-bridge secondary topologies. This capability is integral to the LTC3723EGN-1#PBF's efficiency architecture.

What is the maximum switching frequency supported by the LTC3723EGN-1#PBF?

The LTC3723EGN-1#PBF oscillator operates up to 1MHz, resulting in a maximum push-pull switching frequency of 500kHz. This is achieved with CT = 68pF (per fOSC ≈ 2.56V•CT / 210µA). Higher frequencies reduce maximum achievable duty cycle due to fixed dead-time overhead, so practical designs typically target 200–400kHz for optimal efficiency and thermal performance in the LTC3723EGN-1#PBF.

How does the LTC3723EGN-1#PBF implement undervoltage lockout?

The LTC3723EGN-1#PBF implements dual-stage UVLO: VCC UVLO triggers at 10.25V (with 4.2V hysteresis) to enable internal circuitry, while the UVLO pin accepts an externally divided input voltage compared to the 5.0V reference - enabling programmable system-level turn-on/turn-off thresholds. This two-tier protection ensures robust startup from auxiliary windings and coordinated power sequencing in multi-rail systems using the LTC3723EGN-1#PBF.

Can the LTC3723EGN-1#PBF be used in forward converter topologies?

Yes, the LTC3723EGN-1#PBF supports forward converters via single-ended operation: DRVB can drive the main switch while DRVA remains unused or is repurposed for synchronization, and synchronous rectification is maintained on the secondary side. Application Note 12f confirms this configuration with duty cycle limited to <50% (minus dead-time), making the LTC3723EGN-1#PBF viable for two-transistor forward designs where isolation and efficiency are critical.