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

Analog Devices Inc. LTC3736EUF-1#TRPBF

Name: LTC3736EUF-1#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3736EUF-1#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3736EUF-1#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 24-WFQFN Exposed Pad

Datasheet:: LTC3736EUF-1#TRPBF.pdf

Description:: IC REG CTRLR BUCK 24QFN

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Product details

Overview

LTC3736EUF-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual 2-phase synchronous step-down controller driving external complementary MOSFETs without current-sense resistors. It delivers two independent regulated outputs (e.g., 2.5V/1.8V), supports 2.75V–9.8V input, features spread-spectrum switching (450–580 kHz), and enables low-noise power delivery in space-constrained portable systems.

For engineers reviewing the LTC3736EUF-1#TRPBF datasheet, LTC3736EUF-1#TRPBF pinout, LTC3736EUF-1#TRPBF application, or LTC3736EUF-1#TRPBF equivalent, this page provides verified functional context, validated package mapping, confirmed 24-pin QFN pin roles, and real-world EMI-reduction trade-offs versus fixed-frequency alternatives.

Technical Context

The LTC3736EUF-1#TRPBF implements constant-frequency current-mode control with MOSFET V_DS sensing to eliminate R_SENSE, using two interleaved 180°-out-of-phase controllers to halve input capacitor RMS current. Its architecture integrates independent error amplifiers, slope-compensated peak-current comparators, and dual gate drivers for external P-channel high-side and N-channel low-side MOSFETs.

Spread spectrum is achieved via random frequency dithering between 450 kHz and 580 kHz, reducing peak conducted/radiated EMI by >20 dBm at fundamental and harmonics. Tracking startup is supported through the TRACK pin, enabling coordinated ramp-up of VOUT2 relative to VOUT1 using external resistor dividers.

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 without external regulation.
Output Voltage Reference	0.6V ±1.5% over –40°C to 85°C - enables precise output regulation with minimal drift across temperature.
Switching Frequency	450–580 kHz (spread spectrum enabled); 300/550/750 kHz selectable (SSDIS = VIN) - balances efficiency vs. component size and EMI compliance.
Peak Gate Drive Current	1A per driver (<10 µs pulse) - ensures fast turn-on/turn-off of external MOSFETs with low propagation delay.
Shutdown Quiescent Current	9 µA - extends battery life in always-on or standby modes of portable electronics.
Current Sense Threshold	70–223 mV (selectable via IPRG pins) - adapts peak current limit to MOSFET R_DS(on) and duty cycle for optimal efficiency.
Power Good Accuracy	±10% window on VFB - provides reliable system-level power sequencing and fault detection.

Pinout & Package

Package: 24-pin, 4 mm × 4 mm, 0.75 mm height thermally enhanced QFN (UF package). Exposed pad (Pin 25) must be soldered to PGND for thermal and electrical integrity.

Pin	Circuit Role	Design Meaning
ITH1 / ITH2 (Pins 1, 8)	Current threshold & compensation node	Sets peak inductor current limit (0.7–2.0 V range); connects to RC network for loop stability.
FREQ (Pin 3)	Frequency adjust / spread-spectrum filter	Selects fixed frequency (GND/VIN/floating) or filters dither signal when SSDIS = GND.
SGND (Pin 4)	Small-signal ground reference	Return for internal analog circuits; must be isolated from noisy PGND paths.
VIN (Pin 5)	Controller supply input	Powers bias circuitry (not gate drivers); requires local RC filtering (e.g., 10 Ω + 1 µF) for noise immunity.
TRACK (Pin 6)	Tracking reference input	Enables VOUT2 startup tracking of VOUT1 via external resistor divider; overrides VFB2 reference during ramp-up.
PGOOD (Pin 9)	Open-drain power-good monitor	Asserts low if either VFB1 or VFB2 deviates >±10% from 0.6 V; used for system enable/disable sequencing.
PGND (Pins 12, 16, 20, 25)	Power ground return	Common return for gate drivers and reverse-current comparators; exposed pad (Pin 25) is mandatory PGND connection.
RUN/SS (Pin 14)	Enable & external soft-start input	Pull <0.65 V to shut down (9 µA IQ); release for internal 1 ms soft-start or add CSS capacitor for extended ramp.
TG1/TG2 (Pins 17, 15)	Top-gate (PMOS) drive outputs	Drive external P-channel MOSFET gates from PGND to SENSE+; 40 ns rise/fall time into 3000 pF.
SSDIS (Pin 18)	Spread-spectrum disable control	Tie to VIN for fixed-frequency operation; tie to GND to enable dithered 450–580 kHz switching.
BG1/BG2 (Pins 19, 13)	Bottom-gate (NMOS) drive outputs	Drive external N-channel MOSFET gates from PGND to SENSE+; 50 ns rise / 40 ns fall into 3000 pF.
SENSE1+/SENSE2+ (Pins 21, 11)	Current sense positive input	Connects to P-MOSFET source; powers gate drivers and serves as differential sense reference.
SW1/SW2 (Pins 22, 10)	Switch-node connection	Connects to P-MOSFET drain, N-MOSFET drain, and inductor; negative input to current comparator.
IPRG1/IPRG2 (Pins 23, 2)	Peak sense voltage select	Three-state pins: float = 125 mV, GND = 85 mV, VIN = 204 mV - sets max V_SENSE per channel.
VFB1/VFB2 (Pins 24, 7)	Feedback voltage inputs	Accepts resistor-divider output voltage; compared to 0.6 V reference for closed-loop regulation.

Key Features

Feature	Design Value
No R_SENSE operation	Eliminates power loss and board area associated with discrete current-sense resistors via MOSFET V_DS sensing.
2-phase interleaving	Reduces input capacitor RMS current by ~50% versus single-phase dual controllers, enabling smaller, lower-cost input caps.
Spread-spectrum switching	Spreads EMI energy across 450–580 kHz band, lowering peak radiated/conducted emissions by >20 dBm for EMC compliance.
100% duty-cycle capability	Supports dropout operation down to V_IN ≈ V_OUT, extending runtime in battery-powered systems under brownout.
Independent channel control	Each controller has dedicated ITH, VFB, IPRG, and SW nodes - allows asymmetric output voltages, currents, and protection thresholds.
Tracking startup	Ensures monotonic, coordinated power-up of multiple rails (e.g., core + I/O) using resistor-divided VOUT1 on TRACK pin.

Applications

Lithium-Ion Powered Portable Instruments	Notebook & Palmtop Computers
Use Scenario: Handheld test equipment requiring dual low-noise rails (e.g., 2.5V analog front-end, 1.8V digital core) powered from 2-cell Li-ion (7.2V–8.4V). IC Role / Device Role / Timing Role: Dual 2-phase controller managing independent buck stages with interleaved switching to minimize input ripple and EMI. Use Value: Enables compact, fanless design meeting Class B FCC emissions limits without added shielding or ferrites.	Use Scenario: Notebook motherboard supplying CPU core (1.2V) and memory I/O (1.5V) from 12V or 5V intermediate bus. IC Role / Device Role / Timing Role: Dual synchronous controller delivering tightly regulated outputs with tracking startup for safe power sequencing. Use Value: Reduces input capacitor count and footprint by 40% versus discrete single-phase controllers while maintaining transient response.
Distributed DC Power Systems	Industrial Embedded Controllers
Use Scenario: DIN-rail mounted PLC module deriving isolated 3.3V and 5V rails from 24V DC input, with strict conducted EMI requirements. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC controller stage providing clean, low-noise intermediate supplies for downstream isolated converters. Use Value: Spread-spectrum mode meets EN55022 Class A conducted emission limits without compromising efficiency or thermal performance.	Use Scenario: Ruggedized edge gateway operating in –40°C to 85°C ambient, powering FPGA, Ethernet PHY, and sensor interface from 5V rail. IC Role / Device Role / Timing Role: Dual-output controller supporting independent soft-start, overvoltage protection, and power-good signaling for system reliability. Use Value: Micropower shutdown (9 µA) and guaranteed –40°C to 85°C operation ensure long-term field deployment stability.

Lithium-Ion Powered Portable Instruments

Notebook & Palmtop Computers

Use Scenario: Handheld test equipment requiring dual low-noise rails (e.g., 2.5V analog front-end, 1.8V digital core) powered from 2-cell Li-ion (7.2V–8.4V).

IC Role / Device Role / Timing Role: Dual 2-phase controller managing independent buck stages with interleaved switching to minimize input ripple and EMI.

Use Value: Enables compact, fanless design meeting Class B FCC emissions limits without added shielding or ferrites.

Use Scenario: Notebook motherboard supplying CPU core (1.2V) and memory I/O (1.5V) from 12V or 5V intermediate bus.

IC Role / Device Role / Timing Role: Dual synchronous controller delivering tightly regulated outputs with tracking startup for safe power sequencing.

Use Value: Reduces input capacitor count and footprint by 40% versus discrete single-phase controllers while maintaining transient response.

Distributed DC Power Systems

Industrial Embedded Controllers

Use Scenario: DIN-rail mounted PLC module deriving isolated 3.3V and 5V rails from 24V DC input, with strict conducted EMI requirements.

IC Role / Device Role / Timing Role: Primary non-isolated DC/DC controller stage providing clean, low-noise intermediate supplies for downstream isolated converters.

Use Value: Spread-spectrum mode meets EN55022 Class A conducted emission limits without compromising efficiency or thermal performance.

Use Scenario: Ruggedized edge gateway operating in –40°C to 85°C ambient, powering FPGA, Ethernet PHY, and sensor interface from 5V rail.

IC Role / Device Role / Timing Role: Dual-output controller supporting independent soft-start, overvoltage protection, and power-good signaling for system reliability.

Use Value: Micropower shutdown (9 µA) and guaranteed –40°C to 85°C operation ensure long-term field deployment stability.

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
MP2918GL-Z	Fixed 500 kHz frequency; no spread spectrum; integrated MOSFETs (not external drive); 4.5–16V input.	Targets simpler, lower-cost designs where EMI is less critical and board space is premium; lacks V_DS-based sensing.	Choose MP2918GL-Z only if external MOSFET flexibility and ultra-low EMI are not required.
LTC3855EUFD-1#PBF	Single-output, 2-phase controller; no TRACK pin; supports 4.5–38V input; includes PMBus interface.	Used in higher-voltage industrial supplies where dual independent outputs are unnecessary but telemetry is needed.	Choose LTC3855EUFD-1#PBF when system requires digital monitoring and higher input voltage range, not dual-tracking outputs.

Compared with MP2918GL-Z and LTC3855EUFD-1#PBF, the LTC3736EUF-1#TRPBF uniquely combines dual independent 2-phase control, MOSFET V_DS current sensing, spread-spectrum EMI reduction, and analog tracking-making it optimal for portable, battery-sensitive, and EMI-constrained dual-rail applications.

Availability

LTC3736EUF-1#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and distributed DC power systems requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for LTC3736EUF-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 technical and manufacturing continuity for all Linear power products, including rigorous qualification and long-term product support.

The LTC3736EUF-1#TRPBF belongs to Linear's high-performance synchronous controller family, designed specifically for low-noise, high-efficiency multi-rail power delivery in portable and space-constrained applications.

FAQ

What is the function of the SSDIS pin on the LTC3736EUF-1#TRPBF?

The SSDIS (Spread Spectrum Disable) pin on the LTC3736EUF-1#TRPBF controls EMI reduction mode: tying SSDIS to GND enables random frequency dithering between 450 kHz and 580 kHz, while tying it to VIN locks the LTC3736EUF-1#TRPBF to a fixed frequency (300/550/750 kHz selectable via FREQ pin). This pin directly determines whether peak conducted/radiated noise is concentrated or spread.

Can the LTC3736EUF-1#TRPBF operate with only one output active?

Yes, the LTC3736EUF-1#TRPBF supports single-output operation: leave unused VFB, ITH, and IPRG pins properly terminated (e.g., VFB to 0.6 V via divider, ITH to SGND via cap), and disable the inactive channel's RUN/SS or use TRACK pin logic to suppress startup. The active channel retains full functionality-including spread spectrum, current-mode control, and 100% duty cycle-without performance degradation.

How does the LTC3736EUF-1#TRPBF achieve current sensing without a sense resistor?

The LTC3736EUF-1#TRPBF uses MOSFET V_DS sensing: it measures the voltage drop between SENSE+ (connected to P-MOSFET source) and SW (connected to P-MOSFET drain) to derive inductor current. This eliminates R_SENSE losses and PCB area, and the LTC3736EUF-1#TRPBF compensates for R_DS(on) variation with temperature via internal slope compensation and IPRG-selectable thresholds.

What is the purpose of the TRACK pin on the LTC3736EUF-1#TRPBF?

The TRACK pin on the LTC3736EUF-1#TRPBF enables coordinated startup of VOUT2 relative to VOUT1: during soft-start, the LTC3736EUF-1#TRPBF regulates VFB2 to match the TRACK voltage instead of the internal 0.6 V reference. A resistor divider from VOUT1 to TRACK replicates the VOUT2 feedback ratio, ensuring monotonic, slope-matched ramp-up-critical for FPGA or processor power sequencing.

Does the LTC3736EUF-1#TRPBF support short-circuit protection?

Yes, the LTC3736EUF-1#TRPBF includes per-channel short-circuit protection: if VFB drops below 0.12 V, the affected controller reduces switching frequency to 20% of nominal (e.g., 100 kHz from 500 kHz baseline), limiting power dissipation while maintaining regulation on the healthy channel. The LTC3736EUF-1#TRPBF also provides output overvoltage protection (OVP) that forces BG on and TG off when VFB exceeds 0.68 V.

LTC3736EUF-1#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 24-WFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

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:: No

Serial Interfaces:: -

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

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-QFN (4x4)

LTC3736EUF-1#TRPBF FAQ

1.How can I place an order for LTC3736EUF-1#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3736EUF-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 LTC3736EUF-1#TRPBF reliable?

The price and inventory of LTC3736EUF-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 LTC3736EUF-1#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC3736EUF-1#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3736EUF-1#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3736EUF-1#TRPBF?

LTC3736EUF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3736EUF-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 LTC3736EUF-1#TRPBF?

For technical support, including LTC3736EUF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3736EUF-1#TRPBF requirements.

6.How does Aetrix verify that LTC3736EUF-1#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3736EUF-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 LTC3736EUF-1#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3736EUF-1#TRPBF?

All LTC3736EUF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3736EUF-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 LTC3736EUF-1#TRPBF part is unused and in its original packaging.

Return procedure for LTC3736EUF-1#TRPBF:

1.Submit a request within 90 days.

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

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