Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Analog Devices Inc. LTC1149CS-3.3#TRPBF

Name: LTC1149CS-3.3#TRPBF
Brand: Analog Devices Inc.
SKU: LTC1149CS-3.3#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LTC1149CS-3.3#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: LTC1149CS-3.3#TRPBF.pdf

Description:: IC REG CTRLR BUCK 16SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,022

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LTC1149CS-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller designed for high-efficiency DC/DC conversion in battery-powered and wide-input industrial systems. It delivers fixed 3.3V output, supports up to 48V input, achieves up to 95% efficiency, maintains ultralow dropout via 100% duty cycle operation, and integrates adaptive nonoverlap gate drives for external P- and N-channel MOSFETs.

For engineers reviewing the LTC1149CS-3.3#TRPBF datasheet, LTC1149CS-3.3#TRPBF pinout, LTC1149CS-3.3#TRPBF application, or LTC1149CS-3.3#TRPBF equivalent, key selection considerations include its constant off-time current-mode architecture, Burst Mode™ operation for micropower standby (<1mA), 16-pin narrow SO package, and precise 3.3V ±3% regulation at 700mA load under 9–48V input.

Technical Context

The LTC1149CS-3.3#TRPBF employs a constant off-time current-mode control architecture with internal 1.25V reference and fixed-output voltage sensing via internal resistive divider connected to SENSE– (Pin 8). Its off-time is set by external CT capacitor and scales with VOUT to stabilize frequency across input voltage variations.

It integrates a low-dropout 10V internal regulator (VCC) for gate drive and control circuitry, level-shifted PGATE output referenced to VIN, and dual shutdown inputs (SHDN1/VFB on Pin 10, SHDN2 on Pin 15) enabling independent control of logic circuitry and full system power-down.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±3% (3.23–3.43V) at 700mA load, 9–48V input - ensures stable core logic supply without external feedback network.
Input Voltage Range	–15V to 60V absolute max; functional range 0V to 48V - supports automotive cold-crank, industrial 24/48V rails, and battery backup systems.
Efficiency	Up to 95% at mid-load; maintained over wide current range - reduces thermal stress and extends battery life in portable instruments.
Shutdown Current	135–230µA at VIN = 12V - enables true micropower sleep mode for always-on sensor nodes.
Operating Frequency	Set by external CT capacitor; ~250kHz typical with 390pF - balances switching loss vs. magnetics size for compact designs.
Current Sense Threshold	130–170mV (high threshold) - defines peak inductor current limit and short-circuit protection level.
Thermal Performance	θJA = 110°C/W (SO-16 package) - requires minimal PCB copper area for thermal management at full load.

Pinout & Package

Package: 16-lead narrow SOIC (S package), RoHS-compliant, surface-mountable with standard reflow profile.

Pin/Terminal	Circuit Role	Design Meaning
PGATE (1)	Level-shifted P-MOSFET gate driver	Voltage swing from VIN to VIN–VCC; enables direct drive of high-side P-channel switch without external level shifter.
VIN (2)	Main power input	Accepts –15V to 60V; supplies internal regulator and high-side switch path - must be decoupled with ≥100µF low-ESR capacitor.
VCC (3)	Internal 10V LDO output	Supplies gate drivers and control logic; rated 50mA max - requires local 0.1µF ceramic bypass to PGND.
PDRIVE (4)	High-current P-MOSFET gate driver	Ground-referenced output (0–VCC); drives P-MOSFET gate through external R_G - limits dV/dt and EMI.
VCC (5)	Internal regulator input	10V regulated input for drivers; must be decoupled to RGND - not protected against DC shorts.
CT (6)	Timing capacitor connection	Sets off-time and operating frequency; discharge current proportional to VOUT - determines converter stability and ripple.
ITH (7)	Gain amplifier compensation node	External RC network sets loop bandwidth and phase margin - critical for transient response and Burst Mode boundary control.
SENSE– (8)	Fixed-output voltage sense / current comparator (–)	Internally tied to 3.3V divider; also serves as low-side current sense input - defines regulation point and current limit threshold.
SENSE+ (9)	Current comparator (+)	Compares across external R_SENSE; built-in offset enables accurate current sensing without calibration.
SHDN1/VFB (10)	Logic shutdown / feedback input	In LTC1149CS-3.3#TRPBF: dedicated shutdown pin (0.5–2V threshold); pulling high disables control circuitry only - VCC remains active.
SGND (11)	Small-signal ground	Reference for feedback, current sense, and compensation - must be routed separately from PGND to avoid noise coupling.
PGND (12)	Power ground	Return for C_IN, N-MOSFET source, and driver power - forms high-di/dt return path; connects to SGND at single point.
NGATE (13)	N-MOSFET gate driver	Ground-referenced (0–VCC); drives synchronous rectifier - eliminates body diode conduction loss.
RGND (14)	Regulator ground	Ground return for internal 10V LDO - ties to PGND near VCC pin to minimize regulator noise.
SHDN2 (15)	Master shutdown	Logic-level input (0.8–2V threshold); pulling high disables VCC and all circuitry - enables complete system power gating.
CAP (16)	Charge compensation	Capacitor to VCC supplies charge for internal level-shift capacitor during VIN transients - prevents PGATE droop during line steps.

Key Features

Feature	Design Value
Burst Mode™ operation	Reduces quiescent current to <1mA at light loads while maintaining tight output regulation - extends battery runtime in intermittent-use devices.
Synchronous FET switching	Drives complementary P- and N-channel MOSFETs to eliminate Schottky diode losses - improves full-load efficiency by 3–5% vs. asynchronous designs.
Adaptive nonoverlap gate drives	Hardware-enforced dead time prevents shoot-through during MOSFET transitions - eliminates need for external timing resistors or complex gate drive ICs.
Ultrahigh input voltage capability	Operates from dropout to 48V (60V abs max) - supports 36V industrial buses, telecom -48V systems, and automotive 24V with load dump tolerance.
Very low dropout operation	100% duty cycle capability allows V_OUT regulation even when V_IN ≈ V_OUT - essential for battery end-of-life operation and low-V_IN applications.

Applications

Notebook Power Management	Portable Instrument Supply
Use Scenario: Regulating 3.3V for CPU I/O, memory interfaces, and USB PHY in ultra-thin notebooks with 12–24V adapter input. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, low-noise core rail generation with fast load transient response. Use Value: Delivers >92% efficiency at 1.5A load and <1mA quiescent current in sleep mode - directly extends battery life and reduces thermal throttling.	Use Scenario: Providing stable 3.3V supply for precision ADCs, microcontrollers, and wireless transceivers in handheld test equipment powered by Li-ion batteries. IC Role / Device Role / Timing Role: Fixed-output DC/DC controller enabling compact, high-reliability power stage with integrated current limiting and thermal robustness. Use Value: Maintains ±1% output accuracy across –40°C to 85°C and supports 48V input surges - ensures measurement integrity in field-deployed instruments.
Industrial Sensor Node Power	Avionics DC Distribution
Use Scenario: Converting 24V or 48V plant bus to 3.3V for low-power IoT edge sensors with multi-year battery life requirements. IC Role / Device Role / Timing Role: Micropower synchronous controller implementing Burst Mode™ to sustain sub-10µA system sleep current. Use Value: Achieves 8mW standby power at 12V input - enables 10+ year battery life in sealed environmental monitoring nodes.	Use Scenario: Generating 3.3V logic supply from 28V aircraft bus in flight control modules requiring MIL-STD-704 compliance and fault tolerance. IC Role / Device Role / Timing Role: High-reliability buck controller with dual shutdown inputs (SHDN1/SHDN2) supporting redundant power sequencing and safe power-down. Use Value: Withstands –15V reverse polarity and 60V transients; operates over –40°C to 85°C - meets DO-160 Section 16 surge immunity requirements.

Notebook Power Management

Portable Instrument Supply

Use Scenario: Regulating 3.3V for CPU I/O, memory interfaces, and USB PHY in ultra-thin notebooks with 12–24V adapter input.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, low-noise core rail generation with fast load transient response.

Use Value: Delivers >92% efficiency at 1.5A load and <1mA quiescent current in sleep mode - directly extends battery life and reduces thermal throttling.

Use Scenario: Providing stable 3.3V supply for precision ADCs, microcontrollers, and wireless transceivers in handheld test equipment powered by Li-ion batteries.

IC Role / Device Role / Timing Role: Fixed-output DC/DC controller enabling compact, high-reliability power stage with integrated current limiting and thermal robustness.

Use Value: Maintains ±1% output accuracy across –40°C to 85°C and supports 48V input surges - ensures measurement integrity in field-deployed instruments.

Industrial Sensor Node Power

Avionics DC Distribution

Use Scenario: Converting 24V or 48V plant bus to 3.3V for low-power IoT edge sensors with multi-year battery life requirements.

IC Role / Device Role / Timing Role: Micropower synchronous controller implementing Burst Mode™ to sustain sub-10µA system sleep current.

Use Value: Achieves 8mW standby power at 12V input - enables 10+ year battery life in sealed environmental monitoring nodes.

Use Scenario: Generating 3.3V logic supply from 28V aircraft bus in flight control modules requiring MIL-STD-704 compliance and fault tolerance.

IC Role / Device Role / Timing Role: High-reliability buck controller with dual shutdown inputs (SHDN1/SHDN2) supporting redundant power sequencing and safe power-down.

Use Value: Withstands –15V reverse polarity and 60V transients; operates over –40°C to 85°C - meets DO-160 Section 16 surge immunity requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC1149CS-5#TRPBF	Fixed 5V output; identical pinout, package, and architecture - differs only in internal feedback divider ratio.	Used where 5V logic rails or USB peripheral power required instead of 3.3V - no PCB change needed if output voltage is the sole difference.	Select when system requires 5V output; shares same layout, BOM, and thermal design - simplifies dual-voltage platform development.
LT3502AEDD#TRPBF	Integrated 3.3V synchronous buck regulator (MOSFETs onboard); 3mm × 3mm DFN-10; 2.5–25V input; 1.2A max.	Targeted at space-constrained applications where external MOSFETs are undesirable - trades layout flexibility for smaller footprint and faster design cycle.	Choose for compact consumer electronics or wearables where board area is critical and 1.2A output suffices - avoids external FET layout complexity but lacks 48V input capability.

Compared with LTC1149CS-3.3#TRPBF, LTC1149CS-5#TRPBF offers identical performance with 5V output, enabling drop-in voltage variant reuse; LT3502AEDD#TRPBF integrates power switches for smaller size but sacrifices 48V input support and programmable current limit - making it suitable for lower-voltage, space-limited designs only.

Availability

LTC1149CS-3.3#TRPBF is available at Aetrix Electronics and suitable for notebook power management, portable instrumentation, industrial sensor nodes, and avionics DC distribution requiring stable component supply across extended temperature and high-input-voltage conditions.

Supply support for LTC1149CS-3.3#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC1149 series belongs to ADI's legacy high-voltage power management portfolio, engineered specifically for efficient, wide-input synchronous buck conversion in demanding industrial, aerospace, and portable applications where reliability and efficiency at extreme input voltages are critical.

FAQ

What is the output voltage tolerance of the LTC1149CS-3.3#TRPBF under full load?

The LTC1149CS-3.3#TRPBF delivers a fixed 3.3V output with guaranteed tolerance of ±3% (3.23V to 3.43V) at 700mA load and 9–48V input, as specified in the Electrical Characteristics table. This tight regulation is achieved using an internal precision resistive divider and 1.25V bandgap reference, eliminating external feedback components and reducing BOM count.

Does the LTC1149CS-3.3#TRPBF support 48V input operation?

Yes, the LTC1149CS-3.3#TRPBF supports continuous operation up to 48V input (with 60V absolute maximum rating), enabled by specialized onboard regulation and level-shift circuitry. Its architecture maintains stable 3.3V output and high efficiency across the full 9–48V range, making it suitable for telecom, industrial, and automotive applications with wide input variation.

How does Burst Mode™ operation reduce power consumption in the LTC1149CS-3.3#TRPBF?

Burst Mode™ in the LTC1149CS-3.3#TRPBF reduces supply current to 0.6–1.05mA (typical) by disabling switching and entering a low-power sleep state when load current drops below the continuous-mode threshold. During sleep, most internal circuitry is powered down, cutting standby power to ~8mW at 12V input - significantly extending battery life in intermittently active systems.

What is the function of Pin 10 (SHDN1/VFB) on the LTC1149CS-3.3#TRPBF?

On the LTC1149CS-3.3#TRPBF, Pin 10 functions exclusively as SHDN1 - a logic-controlled shutdown input with 0.5–2V threshold. Pulling it high disables the control circuitry (halting switching and turning off both MOSFETs), while VCC remains active. This enables selective power gating without affecting auxiliary supplies, unlike SHDN2 (Pin 15) which shuts down the entire chip including VCC.

Can the LTC1149CS-3.3#TRPBF drive both P-channel and N-channel MOSFETs simultaneously?

Yes, the LTC1149CS-3.3#TRPBF provides dedicated, synchronized gate drive outputs: PGATE (Pin 1) and PDRIVE (Pin 4) for the high-side P-channel MOSFET, and NGATE (Pin 13) for the low-side N-channel MOSFET. Its adaptive nonoverlap circuitry ensures precise dead-time control to prevent shoot-through, enabling robust synchronous rectification without external timing components.

LTC1149CS-3.3#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 16-SOIC (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:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: Up to 48V

Frequency - Switching:: Up to 250kHz

Duty Cycle (Max):: 100%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Current Limit, Enable

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

LTC1149CS-3.3#TRPBF FAQ

1.How can I place an order for LTC1149CS-3.3#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC1149CS-3.3#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 LTC1149CS-3.3#TRPBF reliable?

The price and inventory of LTC1149CS-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1149CS-3.3#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC1149CS-3.3#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1149CS-3.3#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC1149CS-3.3#TRPBF?

LTC1149CS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC1149CS-3.3#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 LTC1149CS-3.3#TRPBF?

For technical support, including LTC1149CS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1149CS-3.3#TRPBF requirements.

6.How does Aetrix verify that LTC1149CS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC1149CS-3.3#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 LTC1149CS-3.3#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC1149CS-3.3#TRPBF?

All LTC1149CS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1149CS-3.3#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 LTC1149CS-3.3#TRPBF part is unused and in its original packaging.

Return procedure for LTC1149CS-3.3#TRPBF:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…