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

Analog Devices Inc. LTC3736EGN-1#TRPBF

Name: LTC3736EGN-1#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3736EGN-1#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3736EGN-1#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

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

Datasheet:: LTC3736EGN-1#TRPBF.pdf

Description:: IC REG CTRLR BUCK 24SSOP

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Product details

Overview

LTC3736EGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual 2-phase synchronous step-down controller driving external complementary MOSFETs for high-efficiency DC/DC conversion. It features no-RSENSE current sensing via V_DS, spread spectrum switching (450–580 kHz), 0.6 V ±1.5% reference, and 2.75 V to 9.8 V input range - enabling compact, low-noise power supplies in battery-powered portable electronics.

For engineers reviewing the LTC3736EGN-1#TRPBF datasheet, LTC3736EGN-1#TRPBF pinout, LTC3736EGN-1#TRPBF application, or LTC3736EGN-1#TRPBF equivalent, key selection criteria include its dual 2-phase interleaved architecture, out-of-phase operation reducing input RMS current, micropower shutdown (9 µA), and tracking capability for coordinated multi-rail start-up.

Technical Context

The LTC3736EGN-1#TRPBF implements constant-frequency current-mode control with MOSFET V_DS sensing to eliminate sense resistors, improving efficiency and thermal performance. Its two controllers operate 180° out of phase, minimizing input capacitor RMS current and EMI.

Spread spectrum modulation randomly dithers switching frequency between 450 kHz and 580 kHz, reducing peak conducted/radiated noise by >20 dBm versus fixed-frequency operation. Pulse-skipping at light loads maintains high efficiency without audible noise or output ripple degradation.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Dual 2-phase synchronous buck controller - drives external N/P-channel MOSFETs for two independent regulated outputs.
Input Voltage Range	2.75 V to 9.8 V - supports single/dual-cell Li-ion, USB PD, and intermediate bus applications.
Reference Voltage	0.6 V ±1.5% over –40°C to +85°C - enables precise output regulation down to sub-1 V with tight load/line transient response.
Switching Frequency	450–580 kHz (spread spectrum enabled); 300/550/750 kHz selectable (SS disabled) - balances efficiency, component size, and EMI compliance.
Shutdown Current	9 µA - extends battery life in always-on or standby systems requiring ultra-low quiescent power.
Current Sense Method	V_DS-based, no external R_SENSE - eliminates sense resistor losses and PCB area, improves thermal design margin.
Protection Features	Output overvoltage (0.68 V threshold), short-circuit foldback (1/5 frequency), PGOOD monitoring, UVLO (2.25 V nominal) - ensures robust system-level reliability.

Pinout & Package

The LTC3736EGN-1#TRPBF is housed in a 24-lead plastic narrow SSOP package (GN), 0.65 mm pitch, with exposed thermal pad connected to PGND. Pin 1 is top-left corner (dot-marked), pin count proceeds counter-clockwise.

Pin/Terminal	Circuit Role	Design Meaning
SW1 / SW2	Switch node connection	Drain connection point for external P/N-MOSFETs; serves as 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+; supports high-side synchronous rectification.
BG1 / BG2	Bottom gate drive output	Drives gates of external N-channel MOSFETs; swing from PGND to SENSE+; enables efficient low-side switching.
SENSE1+ / SENSE2+	Current sense positive input	Connects to source of P-MOSFET; powers gate drivers and provides V_DS sensing path for current mode control.
VFB1 / VFB2	Feedback input	Receives scaled output voltage via resistor divider; compared to 0.6 V reference to regulate each output independently.
ITH1 / ITH2	Error amplifier compensation / current threshold	Setpoint for peak inductor current; voltage determines current limit; also used for loop compensation network attachment.
IPRG1 / IPRG2	Peak sense voltage select	Three-state pins (float/VIN/GND) set max V_SENSE to 125/204/85 mV - enables duty-cycle–adaptive current limiting.
RUN/SS	Enable & soft-start control	Pull <0.65 V to shut down (9 µA IQ); internal 0.7 µA current source charges external CSS for programmable soft-start ramp.
TRACK	Tracking reference input	Allows VOUT2 to track VOUT1 during start-up via resistor divider; enables coordinated rail sequencing without external ICs.
PGOOD	Power-good open-drain output	Asserts low when either VFB deviates >±10% from 0.6 V; signals system controller that both rails are in regulation.
FREQ	Frequency adjust / spread spectrum filter	When SSDIS = VIN: selects 300/550/750 kHz; when SSDIS = GND: accepts analog voltage (0.7–1.5 V) to tune center frequency.
SSDIS	Spread spectrum disable	Tie to VIN for fixed-frequency operation; tie to GND to enable random frequency dithering (450–580 kHz).
PGND (Pins 15, 19, 23)	Power ground	Return path for gate drivers and current comparators; must be low-inductance connection to minimize switching noise.
SGND (Pin 7)	Small-signal ground	Reference for internal analog circuits (EAMP, references, comparators); separate from PGND to avoid noise coupling.

Key Features

Feature	Design Value
No-RSENSE current sensing	Eliminates power loss and board space of external sense resistors by using MOSFET R_DS(on) as current sensor.
2-phase interleaved operation	Reduces input capacitor RMS current by ~50% vs single-phase dual controller - cuts input cap size, cost, and EMI filtering requirements.
Spread spectrum frequency modulation	Spreads EMI energy across 130 kHz bandwidth, lowering peak radiated/conducted emissions >20 dBm for faster EMC certification.
Tracking start-up with internal soft-start	Enables controlled, sequenced ramp-up of dual outputs (e.g., core + I/O rails) using one resistor divider - no external sequencer needed.
100% duty cycle low-dropout mode	Maintains regulation as VIN approaches VOUT - extends runtime in battery-powered systems during discharge.
Pulse-skipping light-load mode	Preserves >85% efficiency at 10 mA load while suppressing audio noise and minimizing output ripple - ideal for always-on subsystems.

Applications

Portable Computing Power	Lithium-Ion Battery Systems
Use Scenario: Dual-rail power supply for notebook CPU core (1.8 V) and memory I/O (2.5 V) from 7 V Li-ion battery pack. IC Role / Device Role / Timing Role: Dual 2-phase synchronous controller managing interleaved switching, current sharing, and coordinated start-up. Use Value: Reduces input capacitor RMS current from 1.79 A to 0.91 A - enabling smaller, lower-cost ceramic input caps and easing EMI filtering.	Use Scenario: High-efficiency dual-output converter in handheld medical device powered by single-cell Li-ion (2.7–4.2 V). IC Role / Device Role / Timing Role: No-RSENSE controller delivering regulated 3.3 V and 1.2 V rails with tracking start-up and low-quiescent shutdown. Use Value: 9 µA shutdown current extends battery life; 100% duty cycle operation sustains output during deep discharge (<3.0 V).
Industrial Portable Instruments	Distributed DC Power Architecture
Use Scenario: Compact, low-noise power stage in battery-operated oscilloscope or multimeter requiring clean analog and digital supplies. IC Role / Device Role / Timing Role: Spread spectrum controller generating quiet 3.3 V and 5.0 V rails with minimal conducted EMI on shared PCB. Use Value: >20 dBm reduction in fundamental switching noise eliminates need for ferrite beads or shielded inductors - saving BOM cost and layout area.	Use Scenario: Intermediate bus converter in modular test equipment, deriving multiple isolated rails from 12 V backplane. IC Role / Device Role / Timing Role: Dual-phase controller supporting scalable, parallelable power stages with synchronized clocking and current balancing. Use Value: Out-of-phase operation allows shared input bulk capacitance across multiple LTC3736EGN-1#TRPBF-based modules - reducing total system capacitance by 30–40%.

Portable Computing Power

Lithium-Ion Battery Systems

Use Scenario: Dual-rail power supply for notebook CPU core (1.8 V) and memory I/O (2.5 V) from 7 V Li-ion battery pack.

IC Role / Device Role / Timing Role: Dual 2-phase synchronous controller managing interleaved switching, current sharing, and coordinated start-up.

Use Value: Reduces input capacitor RMS current from 1.79 A to 0.91 A - enabling smaller, lower-cost ceramic input caps and easing EMI filtering.

Use Scenario: High-efficiency dual-output converter in handheld medical device powered by single-cell Li-ion (2.7–4.2 V).

IC Role / Device Role / Timing Role: No-RSENSE controller delivering regulated 3.3 V and 1.2 V rails with tracking start-up and low-quiescent shutdown.

Use Value: 9 µA shutdown current extends battery life; 100% duty cycle operation sustains output during deep discharge (<3.0 V).

Industrial Portable Instruments

Distributed DC Power Architecture

Use Scenario: Compact, low-noise power stage in battery-operated oscilloscope or multimeter requiring clean analog and digital supplies.

IC Role / Device Role / Timing Role: Spread spectrum controller generating quiet 3.3 V and 5.0 V rails with minimal conducted EMI on shared PCB.

Use Value: >20 dBm reduction in fundamental switching noise eliminates need for ferrite beads or shielded inductors - saving BOM cost and layout area.

Use Scenario: Intermediate bus converter in modular test equipment, deriving multiple isolated rails from 12 V backplane.

IC Role / Device Role / Timing Role: Dual-phase controller supporting scalable, parallelable power stages with synchronized clocking and current balancing.

Use Value: Out-of-phase operation allows shared input bulk capacitance across multiple LTC3736EGN-1#TRPBF-based modules - reducing total system capacitance by 30–40%.

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-1#TRPBF	Same die in 4 mm × 4 mm QFN-24 (UF) package with exposed thermal pad; θ_JA = 37°C/W vs 130°C/W for GN package.	Better thermal performance for high-current (>5 A per phase) or high-ambient designs; requires different PCB land pattern and reflow profile.	Select when thermal headroom is constrained and board space allows QFN footprint; not drop-in compatible with SSOP layout.
MP2918GL-Z	Dual 2-phase controller with integrated MOSFET drivers only (no power FETs); fixed 500 kHz freq; no spread spectrum; 2.5–24 V input.	Lacks V_DS current sensing - requires external sense resistors; no tracking or programmable soft-start; wider VIN but no low-VIN support below 2.5 V.	Consider for cost-sensitive, non-battery applications where input >3 V and EMI is less critical; not suitable for <3 V Li-ion or low-noise portable use.

Compared with LTC3736EUF-1#TRPBF, the LTC3736EGN-1#TRPBF offers superior manufacturability in legacy SSOP layouts and lower assembly cost, while MP2918GL-Z trades away spread spectrum and no-RSENSE capability for simplified BOM - making LTC3736EGN-1#TRPBF optimal for noise-sensitive, battery-critical dual-rail designs.

Availability

LTC3736EGN-1#TRPBF is available at Aetrix Electronics and suitable for portable computing power, lithium-ion battery systems, and industrial portable instruments requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.

Supply support for LTC3736EGN-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 AEC-Q200-aligned qualification and long-term product roadmaps.

The LTC3736EGN-1#TRPBF belongs to Linear's high-performance synchronous controller family, designed specifically for compact, low-noise, multi-rail DC/DC conversion in portable and battery-powered systems demanding efficiency, sequencing, and EMI control.

FAQ

What is the primary function of the LTC3736EGN-1#TRPBF?

The LTC3736EGN-1#TRPBF is a dual 2-phase synchronous step-down controller that drives external N- and P-channel MOSFETs to generate two regulated DC outputs. It uses V_DS-based current sensing (no R_SENSE), spread spectrum switching, and out-of-phase operation to achieve high efficiency, low EMI, and compact power solutions - especially in portable Li-ion applications.

Does the LTC3736EGN-1#TRPBF require external current sense resistors?

No. The LTC3736EGN-1#TRPBF eliminates external current sense resistors by measuring the voltage drop across the R_DS(on) of the external P-channel MOSFETs (via SENSE+/SW nodes). This reduces power loss, board area, and thermal stress - a core feature confirmed in the datasheet's "No RSENSE" trademarked architecture.

How does the spread spectrum feature of the LTC3736EGN-1#TRPBF reduce EMI?

The LTC3736EGN-1#TRPBF spreads its switching frequency randomly between 450 kHz and 580 kHz when SSDIS = GND. This dithering distributes electromagnetic energy across a 130 kHz band, lowering peak spectral amplitude by >20 dBm versus fixed-frequency operation - directly easing compliance with CISPR 22/32 and FCC Part 15 conducted/radiated limits.

Can the LTC3736EGN-1#TRPBF support coordinated start-up of two output rails?

Yes. The TRACK pin enables precise start-up sequencing: connecting a resistor divider from VOUT1 to TRACK causes VOUT2 to track VOUT1's ramp rate and final ratio. This eliminates need for external sequencers and ensures safe, controlled power-up of core/I/O or analog/digital rails - a documented function in the LTC3736EGN-1#TRPBF's functional diagrams and application notes.

What is the operating temperature range guaranteed for the LTC3736EGN-1#TRPBF?

The LTC3736EGN-1#TRPBF is specified and tested over –40°C to +85°C ambient temperature. Electrical characteristics including 0.6 V ±1.5% reference, UVLO thresholds, and current limit accuracy are guaranteed across this full range - confirmed in the "Electrical Characteristics" table under "● denotes specifications that apply over the full operating temperature range".

LTC3736EGN-1#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

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

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-SSOP

LTC3736EGN-1#TRPBF FAQ

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

Please submit a Request for Quotation (RFQ) for LTC3736EGN-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 LTC3736EGN-1#TRPBF reliable?

The price and inventory of LTC3736EGN-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 LTC3736EGN-1#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC3736EGN-1#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3736EGN-1#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3736EGN-1#TRPBF?

LTC3736EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3736EGN-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 LTC3736EGN-1#TRPBF?

For technical support, including LTC3736EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3736EGN-1#TRPBF requirements.

6.How does Aetrix verify that LTC3736EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3736EGN-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 LTC3736EGN-1#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3736EGN-1#TRPBF?

All LTC3736EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3736EGN-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 LTC3736EGN-1#TRPBF part is unused and in its original packaging.

Return procedure for LTC3736EGN-1#TRPBF:

1.Submit a request within 90 days.

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

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