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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LTC3736EGN-2#PBF

Name: LTC3736EGN-2#PBF
Brand: Analog Devices Inc.
SKU: LTC3736EGN-2#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3736EGN-2#PBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 24-SSOP (0.154", 3.90mm Width)

Datasheet:: LTC3736EGN-2#PBF.pdf

Description:: IC REG CTRLR BUCK 24SSOP

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Product details

Overview

LTC3736EGN-2#PBF from Analog Devices (formerly Linear Technology) is a dual 2-phase synchronous step-down controller driving external complementary MOSFETs without current-sense resistors, featuring V_DS-based current sensing, 0.6V ±1% reference, 2.75V–9.8V input range, and out-of-phase operation to reduce input ripple. It enables high-efficiency power conversion in space-constrained battery-powered systems such as dual-rail notebook CPU/GPU core supplies.

For engineers reviewing the LTC3736EGN-2#PBF datasheet, LTC3736EGN-2#PBF pinout, LTC3736EGN-2#PBF application, or LTC3736EGN-2#PBF equivalent, key selection considerations include its no-R_SENSE architecture, dual-output tracking capability, 100% duty cycle dropout operation, and programmable 300–750kHz switching frequency with PLL synchronization support up to 850kHz.

Technical Context

The LTC3736EGN-2#PBF implements two independent constant-frequency current-mode controllers operating 180° out-of-phase, each using MOSFET V_DS sensing to eliminate sense resistors and improve efficiency. Its ITH pins set peak current thresholds via voltage-controlled comparators, while the TRACK pin enables precise output voltage sequencing between VOUT1 and VOUT2 during startup.

It integrates a true phase-locked loop (PLL) for external clock synchronization (250–850kHz), selectable pulse-skipping or forced continuous mode via SYNC/FCB, auxiliary winding regulation capability, and comprehensive protection including overvoltage (0.66–0.7V at VFB), short-circuit frequency foldback, and micropower shutdown (I_Q = 9μA).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.75V to 9.8V - supports single/dual Li-ion battery inputs and wide industrial rails.
Reference Voltage	0.6V ±1% - enables accurate output regulation down to sub-1V levels with tight load/line regulation.
Switching Frequency	300kHz to 750kHz (programmable); syncable 250–850kHz - balances efficiency vs. component size and EMI control.
Current Sensing	V_DS-based, no external R_SENSE - eliminates power loss and noise from sense resistors; supports 167–345mV ΔV_SENSE(MAX) per channel.
Output Tracking	True analog tracking via TRACK pin - ensures controlled, ratio-matched startup of second output relative to first.
Duty Cycle Range	0% to 100% - enables low-dropout operation essential for battery end-of-life runtime extension.
Shutdown Current	9μA - minimizes quiescent drain in always-on or standby subsystems.

Pinout & Package

The LTC3736EGN-2#PBF is packaged in a 24-lead plastic SSOP (GN package), 0.15mm lead pitch, thermally enhanced for high-current DC/DC applications. Exposed pad is not present in SSOP variant.

Pin	Circuit Role	Design Meaning
SW1/SW2	Switch node connection	Drain node of external P-MOSFET and N-MOSFET; negative input to current comparator and reverse-current detector.
TG1/TG2	Top gate drive output	Drives gates of external P-channel MOSFETs; swing from PGND to SENSE+.
BG1/BG2	Bottom gate drive output	Drives gates of external N-channel MOSFETs; swing from PGND to SENSE+.
SENSE1+/SENSE2+	Current sense positive input	Connects to source of P-MOSFET; powers gate drivers and serves as current comparator reference.
VFB1/VFB2	Feedback input	Receives resistor-divider voltage from respective output; compared to 0.6V internal reference.
ITH1/ITH2	Current threshold & compensation	Sets peak inductor current limit (0.7–2V range); also used for error amplifier compensation network.
RUN/SS	Enable & soft-start control	Pull below 0.65V to shut down; internal 0.7μA current source enables soft-start when released.
TRACK	Tracking reference input	Enables VOUT2 startup to follow VOUT1 via external resistor divider; regulates VFB2 to TRACK voltage during ramp.
SYNC/FCB	Multi-function pin	Supports auxiliary winding feedback, external clock sync (250–850kHz), or pulse-skipping/continuous mode selection.
PLLLPF	PLL low-pass filter / freq select	When syncing: RC filter node for PLL; when free-running: sets oscillator frequency (GND=300kHz, VIN=750kHz, float=550kHz).
PGOOD	Power good monitor	Open-drain output pulled low if either VFB deviates >±10% from 0.6V or device is in shutdown/UVLO.
IPRG1/IPRG2	Peak sense voltage select	Three-state inputs selecting max ΔV_SENSE: GND=167mV, float=240mV, VIN=345mV - enables optimization per FET R_DS(on).
PGND (x4)	Power ground	Return path for gate drivers and current comparators; must be low-impedance, separate from SGND.
SGND	Small-signal ground	Reference for internal analog circuits, error amplifiers, and comparators; isolated from PGND.
VIN	Chip supply input	Powers internal circuitry (excluding gate drivers); requires local RC filtering (e.g., 10Ω + 1μF) for noise immunity.

Key Features

Feature	Design Value
No current-sense resistors	V_DS-based sensing eliminates 0.5–2W dissipation and PCB area for R_SENSE, improving thermal performance and efficiency.
Out-of-phase dual controllers	180° interleaving cuts RMS input capacitor current by ~50%, enabling smaller, lower-cost input capacitors and reduced EMI.
True analog output tracking	TRACK pin allows precise, resistor-based ratio-matching of VOUT2 startup to VOUT1 - critical for multi-rail SoC sequencing.
100% duty cycle operation	Enables dropout <100mV at full load - extends usable battery voltage range and runtime in portable Li-ion systems.
Programmable light-load mode	SYNC/FCB pin selects pulse-skipping (high efficiency) or forced continuous (low ripple/audio noise) - configurable per system needs.
Integrated short-circuit protection	Reduces switching frequency to 1/5th on fault - maintains partial regulation on healthy channel while limiting stress on failed rail.

Applications

Mobile Computing Power	Industrial Dual-Rail Systems
Use Scenario: Dual-output power for CPU core (2.5V) and GPU I/O (1.8V) in ultraportable notebooks powered by 2-cell Li-ion (7V–8.4V). IC Role / Device Role / Timing Role: Dual 2-phase synchronous controller managing independent current loops, out-of-phase timing, and coordinated tracking startup. Use Value: Reduces input capacitor RMS current by 49% versus single-phase, cutting board area and cost while extending battery runtime via 100% duty cycle.	Use Scenario: Distributed 3.3V and 1.2V supplies for FPGA + memory subsystem in ruggedized test equipment with wide input (4.5–9V). IC Role / Device Role / Timing Role: Dual-channel step-down controller delivering regulated outputs with independent current limits and synchronized switching via PLL. Use Value: Enables compact, low-noise design with minimal input filtering and robust protection (OVP, short-circuit foldback, UVLO).
Portable Medical Instrumentation	Automotive Infotainment Core Supply
Use Scenario: Precision dual-rail supply (3.3V analog + 1.8V digital) for handheld ultrasound processor with strict EMI and battery life requirements. IC Role / Device Role / Timing Role: No-R_SENSE controller minimizing heat and noise; uses pulse-skipping mode to maintain >85% efficiency at 10mA load. Use Value: Eliminates sense-resistor thermal drift and improves signal integrity in sensitive analog front-end stages.	Use Scenario: Primary 1.1V/1.8V core supply for automotive-grade SoC in head unit, operating from 5–16V nominal vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: High-input-range controller with UVLO (2.25V) and 100% duty cycle enabling operation down to 6V during cranking. Use Value: Maintains SoC functionality during engine start without brownout, supported by robust PGOOD monitoring and thermal shutdown.

Mobile Computing Power

Industrial Dual-Rail Systems

Use Scenario: Dual-output power for CPU core (2.5V) and GPU I/O (1.8V) in ultraportable notebooks powered by 2-cell Li-ion (7V–8.4V).

IC Role / Device Role / Timing Role: Dual 2-phase synchronous controller managing independent current loops, out-of-phase timing, and coordinated tracking startup.

Use Value: Reduces input capacitor RMS current by 49% versus single-phase, cutting board area and cost while extending battery runtime via 100% duty cycle.

Use Scenario: Distributed 3.3V and 1.2V supplies for FPGA + memory subsystem in ruggedized test equipment with wide input (4.5–9V).

IC Role / Device Role / Timing Role: Dual-channel step-down controller delivering regulated outputs with independent current limits and synchronized switching via PLL.

Use Value: Enables compact, low-noise design with minimal input filtering and robust protection (OVP, short-circuit foldback, UVLO).

Portable Medical Instrumentation

Automotive Infotainment Core Supply

Use Scenario: Precision dual-rail supply (3.3V analog + 1.8V digital) for handheld ultrasound processor with strict EMI and battery life requirements.

IC Role / Device Role / Timing Role: No-R_SENSE controller minimizing heat and noise; uses pulse-skipping mode to maintain >85% efficiency at 10mA load.

Use Value: Eliminates sense-resistor thermal drift and improves signal integrity in sensitive analog front-end stages.

Use Scenario: Primary 1.1V/1.8V core supply for automotive-grade SoC in head unit, operating from 5–16V nominal vehicle battery with cold-crank tolerance.

IC Role / Device Role / Timing Role: High-input-range controller with UVLO (2.25V) and 100% duty cycle enabling operation down to 6V during cranking.

Use Value: Maintains SoC functionality during engine start without brownout, supported by robust PGOOD monitoring and thermal shutdown.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-phase synchronous controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC3736EUF-2#PBF	Same die, 4mm × 4mm QFN-24 package with exposed thermal pad (θ_JA = 37°C/W vs SSOP's 130°C/W).	Better thermal performance for >3A/channel designs; requires soldered exposed pad for reliability.	Select for higher power density or elevated ambient temperature environments where thermal resistance matters.
MP2918GL-Z	Single-chip dual-phase controller with integrated MOSFET drivers only (no external FET support); fixed 500kHz frequency; no TRACK or PLL.	Lacks output tracking, external sync, and V_DS sensing - limited to mid-power, cost-sensitive applications without sequencing needs.	Choose only when board space is critical and advanced features like tracking or sync are unnecessary.

Compared with LTC3736EUF-2#PBF, the LTC3736EGN-2#PBF offers identical electrical performance but higher thermal resistance due to SSOP packaging, making it suitable for moderate-power designs where PCB real estate favors narrow-body layout. Versus MP2918GL-Z, the LTC3736EGN-2#PBF provides superior flexibility via external FET control, precision tracking, and PLL synchronization - essential for high-reliability, multi-rail systems.

Availability

LTC3736EGN-2#PBF is available at Aetrix Electronics and suitable for mobile computing power, industrial dual-rail systems, portable medical instrumentation, and automotive infotainment core supplies requiring stable component supply and long-term manufacturability.

Supply support for LTC3736EGN-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 leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC3736 series belongs to ADI's high-efficiency DC/DC controller product line, designed specifically for demanding dual-output, multi-phase power conversion in battery-powered and space-constrained applications where thermal performance, sequencing, and EMI control are critical.

FAQ

What is the maximum input voltage rating for the LTC3736EGN-2#PBF?

The LTC3736EGN-2#PBF has an absolute maximum input supply voltage (VIN) rating of 10V. Its operational input range is specified from 2.75V to 9.8V. Exceeding 10V may cause permanent damage. The device incorporates undervoltage lockout (UVLO) that disables operation below ~2.25V (rising) to prevent unstable regulation.

Does the LTC3736EGN-2#PBF support output voltage tracking, and how is it implemented?

Yes, the LTC3736EGN-2#PBF supports true analog output voltage tracking via the TRACK pin. During startup, the controller regulates VFB2 to match the voltage applied to TRACK instead of the internal 0.6V reference. A resistor divider from VOUT1 to TRACK enables VOUT2 to track VOUT1 with a user-defined ratio - for 1:1 tracking, use identical divider values as those connected to VFB2.

How does the LTC3736EGN-2#PBF achieve current sensing without a sense resistor?

The LTC3736EGN-2#PBF uses MOSFET V_DS sensing: the SENSE+ pin connects to the source of the external P-channel MOSFET, while SW connects to its drain. The differential voltage across the FET (ΔV = V_SENSE+ – V_SW) is measured directly, eliminating R_SENSE losses and noise. Peak sense voltage is selectable (167/240/345mV) via IPRG1/IPRG2 pins.

Can the LTC3736EGN-2#PBF synchronize to an external clock, and what is the supported frequency range?

Yes, the LTC3736EGN-2#PBF supports external clock synchronization via the SYNC/FCB pin with a guaranteed lock range of 250kHz to 850kHz. When synchronized, the internal PLL adjusts the oscillator frequency and phase to align controller 1's top-FET turn-on with the external clock's rising edge, while controller 2 remains 180° out-of-phase.

What protection features are integrated into the LTC3736EGN-2#PBF?

The LTC3736EGN-2#PBF integrates output overvoltage protection (trips at 0.66–0.7V at VFB), short-circuit protection (frequency foldback to 1/5th normal rate), undervoltage lockout (UVLO), power-good monitoring (PGOOD open-drain), and thermal shutdown. It also prevents reverse inductor current in pulse-skipping mode and supports safe 100% duty cycle operation.

LTC3736EGN-2#PBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 24-SSOP (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 2

Output Phases:: 2

Voltage - Supply (Vcc/Vdd):: 2.75V ~ 9.8V

Frequency - Switching:: 300kHz ~ 750kHz

Duty Cycle (Max):: 100%

Synchronous Rectifier:: Yes

Clock Sync:: Yes

Serial Interfaces:: -

Control Features:: Current Limit, Enable, Power Good, Soft Start, Tracking

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SSOP

LTC3736EGN-2#PBF FAQ

1.How can I place an order for LTC3736EGN-2#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3736EGN-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 LTC3736EGN-2#PBF reliable?

The price and inventory of LTC3736EGN-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 LTC3736EGN-2#PBF is usually 5 days.

3.What payment methods are accepted for LTC3736EGN-2#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3736EGN-2#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3736EGN-2#PBF?

LTC3736EGN-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3736EGN-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 LTC3736EGN-2#PBF?

For technical support, including LTC3736EGN-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3736EGN-2#PBF requirements.

6.How does Aetrix verify that LTC3736EGN-2#PBF is sourced from the original manufacturer or authorized distributors?

All LTC3736EGN-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 LTC3736EGN-2#PBF meets industry standards.

7.What is the process for return or replacement of LTC3736EGN-2#PBF?

All LTC3736EGN-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3736EGN-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 LTC3736EGN-2#PBF part is unused and in its original packaging.

Return procedure for LTC3736EGN-2#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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