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

Analog Devices Inc. LTC3737EGN#TRPBF

Name: LTC3737EGN#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3737EGN#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3737EGN#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

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

Datasheet:: LTC3737EGN#TRPBF.pdf

Description:: IC REG CTRLR BUCK 24SSOP

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Product details

Overview

LTC3737EGN#TRPBF from Analog Devices (formerly Linear Technology) is a dual 2-phase synchronous step-down DC/DC controller for high-efficiency power conversion in portable and battery-powered systems. It supports input voltages from 2.75V to 9.8V, delivers two independently regulated outputs from 0.6V to VIN, and features MOSFET V_DS current sensing (no R_SENSE), true PLL synchronization (250–850 kHz), and programmable output voltage tracking - enabling coordinated start-up of dual rails in notebook computers and PDAs.

For engineers reviewing the LTC3737EGN#TRPBF datasheet, LTC3737EGN#TRPBF pinout, LTC3737EGN#TRPBF application, or LTC3737EGN#TRPBF equivalent, key selection considerations include its 2-phase interleaved architecture for reduced input RMS current, selectable Burst Mode® or pulse-skipping light-load operation, 0.6V ±1.5% reference accuracy over –40°C to 85°C, and support for external P-channel MOSFETs with independent peak current threshold programming via IPRG1/IPRG2 pins.

Technical Context

The LTC3737EGN#TRPBF implements a constant-frequency current-mode control architecture with two fully independent controllers operating 180° out of phase. Each channel uses differential V_DS sensing across external P-channel MOSFETs to eliminate sense resistors, while slope-compensated peak current limiting ensures stability at duty cycles >20%.

Its true PLL circuit locks the internal oscillator to an external clock on SYNC/MODE (250–850 kHz), and the PLLLPF pin serves as both frequency select input (300/550/750 kHz) and PLL loop filter node. Tracking functionality is implemented via analog voltage injection at the TRACK pin, allowing VOUT2 to follow VOUT1's ramp during start-up without additional ICs.

Key Specifications

Parameter	Value and Actual Design Meaning
VIN Range	2.75V to 9.8V - supports single/dual Li-ion battery inputs and wide industrial supply rails.
VOUT Range	0.6V to VIN - enables low-voltage core supplies (e.g., 1.8V, 2.5V) and dropout operation down to 100% duty cycle.
Reference Voltage	0.6V ±1.5% (–40°C to 85°C) - ensures tight output regulation accuracy across temperature for precision rails.
Switching Frequency	250–850 kHz (PLL-synchronized) or 300/550/750 kHz (free-running) - balances efficiency vs. size of magnetics and capacitors.
Peak Current Threshold	Selectable: 85 mV / 125 mV / 204 mV per channel via IPRG1/IPRG2 - matches MOSFET R_DS(ON) for optimal conduction loss vs. noise immunity.
Quiescent Current	9 µA in shutdown - extends battery life in always-on or standby modes.
Output Tracking	Analog TRACK pin accepts remote feedback ratio - enables precise sequencing of dual supplies without external supervisors.

Pinout & Package

The LTC3737EGN#TRPBF is housed in a thermally enhanced 24-lead SSOP (narrow) package (4mm × 4mm footprint, 0.65mm pitch), with exposed PGND pad (Pin 19) requiring PCB soldering for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 8)	Signal power supply	Powers internal logic and error amplifiers; requires local RC filtering to suppress switching noise coupling.
PGND (Pin 19)	Power ground	Return path for gate drivers; must be connected to exposed pad and low-impedance ground plane.
PGATE1/PGATE2 (Pins 20, 18)	P-channel MOSFET gate drivers	Drive external high-side switches from PGND to SENSE+; 40 ns rise/fall time supports fast switching.
SENSE1+/SENSE2+ (Pins 24, 14)	Current sense positive inputs	Connect to MOSFET source; enable V_DS-based current sensing without resistor losses.
SW1/SW2 (Pins 1, 13)	Switch node connections	Connect to MOSFET drain and inductor; serve as negative inputs to current comparators.
ITH1/ITH2 (Pins 4, 11)	Error amplifier output / current threshold	Set peak inductor current limit; nominal 0.7–2.0 V range allows compensation network design.
TRACK (Pin 9)	Tracking reference input	Accepts scaled VOUT1 feedback to force VOUT2 start-up alignment - eliminates need for discrete tracking ICs.
RUN/SS (Pin 17)	Enable and soft-start control	Pull below 0.65 V to shut down; internal 0.7 µA current source enables 1 ms soft-start or external capacitor extension.
SYNC/MODE (Pin 21)	PLL sync input / light-load mode select	High = Burst Mode®; low = pulse skipping; clocked = PLL lock - configures efficiency vs. noise trade-off.
PGOOD (Pin 12)	Open-drain power-good monitor	Asserts low if either VFB1 or VFB2 deviates >±13.3% from 0.6 V - provides system-level rail validation.

Key Features

Feature	Design Value
2-phase interleaved operation	Reduces input capacitor RMS current by ~50% versus single-phase dual controllers - cuts input cap size, cost, and EMI.
No R_SENSE current sensing	Uses MOSFET V_DS for current detection - eliminates sense resistor power loss and board space, improving full-load efficiency.
True PLL synchronization	Locks to external clock (250–850 kHz) with guaranteed capture range - enables deterministic timing in noise-sensitive or multi-rail systems.
Independent peak current threshold selection	IPRG1/IPRG2 pins set 85/125/204 mV thresholds per channel - optimizes current limit for mismatched output voltages or loads.
Programmable output tracking	TRACK pin accepts analog voltage divider from VOUT1 - achieves precise rail sequencing without external supervisors or timers.
Burst Mode® / pulse skipping selection	SYNC/MODE pin selects high-efficiency light-load operation (Burst Mode®) or low-noise PWM skipping - adapts to dynamic load profiles.

Applications

Notebook Power Management	Portable Instrumentation
Use Scenario: Dual-rail CPU + memory supply in ultra-thin notebooks powered by 2-cell Li-ion batteries (7V–8.4V). IC Role / Device Role / Timing Role: Dual 2-phase controller regulating 2.5V CPU core and 1.8V DDR interface with synchronized start-up and ripple cancellation. Use Value: Interleaved operation reduces input capacitor RMS current from 1.79A to 0.91A - enabling smaller, lower-cost ceramic input caps and extending battery runtime.	Use Scenario: Battery-powered handheld test equipment requiring isolated, sequenced 3.3V analog and 1.2V digital supplies. IC Role / Device Role / Timing Role: Dual controller with TRACK pin enforcing 1:1 voltage ramp alignment between rails during cold start. Use Value: Eliminates need for external power sequencer ICs - reduces BOM count, layout area, and startup timing uncertainty.
Distributed DC Power Systems	Li-ion Powered Medical Devices
Use Scenario: Point-of-load regulation in modular industrial systems with shared 5V/12V backplane and localized 1.5V/0.9V FPGA supplies. IC Role / Device Role / Timing Role: High-efficiency dual controller supporting wide VIN (2.75–9.8V) and precise 0.6V reference for stable low-voltage rails. Use Value: 0.6V ±1.5% reference over –40°C to 85°C ensures <±1% output tolerance - critical for FPGA core voltage compliance.	Use Scenario: Portable ultrasound or glucose monitor using single-cell Li-ion (2.7–4.2V) to generate 3.3V system rail and 1.8V sensor interface. IC Role / Device Role / Timing Role: Low-quiescent-current (9 µA shutdown) controller with 100% duty cycle dropout operation for maximum battery utilization. Use Value: Extends usable battery capacity by maintaining regulation down to V_IN ≈ V_OUT - increases device runtime by up to 12% versus non-dropout controllers.

Notebook Power Management

Portable Instrumentation

Use Scenario: Dual-rail CPU + memory supply in ultra-thin notebooks powered by 2-cell Li-ion batteries (7V–8.4V).

IC Role / Device Role / Timing Role: Dual 2-phase controller regulating 2.5V CPU core and 1.8V DDR interface with synchronized start-up and ripple cancellation.

Use Value: Interleaved operation reduces input capacitor RMS current from 1.79A to 0.91A - enabling smaller, lower-cost ceramic input caps and extending battery runtime.

Use Scenario: Battery-powered handheld test equipment requiring isolated, sequenced 3.3V analog and 1.2V digital supplies.

IC Role / Device Role / Timing Role: Dual controller with TRACK pin enforcing 1:1 voltage ramp alignment between rails during cold start.

Use Value: Eliminates need for external power sequencer ICs - reduces BOM count, layout area, and startup timing uncertainty.

Distributed DC Power Systems

Li-ion Powered Medical Devices

Use Scenario: Point-of-load regulation in modular industrial systems with shared 5V/12V backplane and localized 1.5V/0.9V FPGA supplies.

IC Role / Device Role / Timing Role: High-efficiency dual controller supporting wide VIN (2.75–9.8V) and precise 0.6V reference for stable low-voltage rails.

Use Value: 0.6V ±1.5% reference over –40°C to 85°C ensures <±1% output tolerance - critical for FPGA core voltage compliance.

Use Scenario: Portable ultrasound or glucose monitor using single-cell Li-ion (2.7–4.2V) to generate 3.3V system rail and 1.8V sensor interface.

IC Role / Device Role / Timing Role: Low-quiescent-current (9 µA shutdown) controller with 100% duty cycle dropout operation for maximum battery utilization.

Use Value: Extends usable battery capacity by maintaining regulation down to V_IN ≈ V_OUT - increases device runtime by up to 12% versus non-dropout controllers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC3780	Single-channel, 2-phase synchronous buck controller; supports N-channel MOSFETs with bootstrap gate drive; no TRACK pin or output tracking.	Designed for higher-power single-rail applications (e.g., 12V→3.3V @ 20A); lacks dual independent outputs and sequencing capability.	Choose LTC3780 when only one regulated output is needed and N-MOSFET efficiency is prioritized over dual-rail coordination.
TPS51220A	TI dual-output, single-phase controller; integrated MOSFET drivers; fixed 0.6V reference; no PLL sync or V_DS sensing - requires external sense resistors.	Targeted at cost-sensitive laptop VRMs; limited VIN range (3–24V), no tracking, and no 2-phase interleaving - higher input ripple.	Choose TPS51220A for simpler, lower-BOM-cost dual-rail designs where input ripple and sequencing precision are less critical.

Compared with LTC3737EGN#TRPBF, LTC3780 offers higher single-rail current capability but no dual-output tracking, while TPS51220A reduces component count at the expense of interleaving benefits and analog sequencing flexibility - making LTC3737EGN#TRPBF uniquely suited for compact, battery-sensitive dual-rail systems requiring precision coordination and minimal input capacitance.

Availability

LTC3737EGN#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and distributed DC power systems requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 85°C.

Supply support for LTC3737EGN#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC3737EGN#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for portable and battery-powered applications demanding dual-rail coordination, ultra-low quiescent current, and MOSFET V_DS-based current sensing.

FAQ

What is the function of the TRACK pin on the LTC3737EGN#TRPBF?

The TRACK pin on the LTC3737EGN#TRPBF enables analog voltage-based output tracking: when a resistor divider from VOUT1 is connected to TRACK, the controller regulates VFB2 to match the TRACK voltage during start-up - ensuring VOUT2 ramps in precise proportion to VOUT1. This eliminates external sequencing ICs and supports one-to-one or scaled tracking ratios depending on the divider values used with the LTC3737EGN#TRPBF.

Does the LTC3737EGN#TRPBF require external current sense resistors?

No, the LTC3737EGN#TRPBF does not require external current sense resistors. It uses MOSFET V_DS sensing via the SENSE+ and SW pins to detect peak inductor current - reducing power loss, board space, and thermal stress. This No R_SENSE architecture is confirmed in the datasheet's features, functional diagram, and application circuits for the LTC3737EGN#TRPBF.

How does the LTC3737EGN#TRPBF achieve 2-phase interleaving, and what is its benefit?

The LTC3737EGN#TRPBF internally phases its two controllers 180° apart, causing their switch-node currents to interleave. This reduces input capacitor RMS current by up to 50% compared to in-phase dual controllers - lowering required capacitance, EMI, and power loss in the input path. The benefit is validated in Figure 4 of the LTC3737EGN#TRPBF datasheet, showing 0.91A RMS vs. 1.79A for single-phase operation under identical loads.

What are the supported switching frequencies for the LTC3737EGN#TRPBF?

The LTC3737EGN#TRPBF supports free-running frequencies of 300 kHz (PLLLPF = GND), 550 kHz (PLLLPF = floating), or 750 kHz (PLLLPF = VIN). When externally synchronized, it locks to clocks from 250 kHz to 850 kHz via the SYNC/MODE pin - with guaranteed lock range specified over temperature and process variation. All frequency settings apply directly to the LTC3737EGN#TRPBF without external components.

Can the LTC3737EGN#TRPBF operate in dropout mode, and what is the minimum input voltage?

Yes, the LTC3737EGN#TRPBF supports 100% duty cycle operation for low-dropout regulation. It maintains regulation as VIN approaches VOUT, with undervoltage lockout disabling operation only below 2.25V (rising) or 1.95V (falling). This enables extended battery runtime in Li-ion applications - for example, sustaining 1.8V output down to VIN ≈ 1.9V - a key specification verified in the LTC3737EGN#TRPBF's electrical characteristics table.

LTC3737EGN#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:: 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

LTC3737EGN#TRPBF FAQ

1.How can I place an order for LTC3737EGN#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3737EGN#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 LTC3737EGN#TRPBF reliable?

The price and inventory of LTC3737EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3737EGN#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC3737EGN#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3737EGN#TRPBF transactions.

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4.How is shipping managed for LTC3737EGN#TRPBF?

LTC3737EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3737EGN#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 LTC3737EGN#TRPBF?

For technical support, including LTC3737EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3737EGN#TRPBF requirements.

6.How does Aetrix verify that LTC3737EGN#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3737EGN#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 LTC3737EGN#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3737EGN#TRPBF?

All LTC3737EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3737EGN#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 LTC3737EGN#TRPBF part is unused and in its original packaging.

Return procedure for LTC3737EGN#TRPBF:

1.Submit a request within 90 days.

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

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