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Analog Devices Inc. LTC1149CS-5#TRPBF
- Part No.:
- LTC1149CS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1149CS-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,108
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Product details
Overview
LTC1149CS-5#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external complementary P- and N-channel MOSFETs for fixed 5V output. It operates from 4.5V to 48V input, delivers up to 2A load current, achieves 95% peak efficiency, and features Burst Mode™ operation for ultralow quiescent current (0.6–0.9mA) at light loads.
For engineers reviewing the LTC1149CS-5#TRPBF datasheet, LTC1149CS-5#TRPBF pinout, LTC1149CS-5#TRPBF application, or LTC1149CS-5#TRPBF equivalent, key selection criteria include its constant off-time current-mode architecture, 5V fixed-output regulation with ±2% tolerance, 16-pin narrow SOIC package, and dual shutdown control (SHDN1/SHDN2) enabling precise power sequencing in battery-powered and industrial DC/DC systems.
Technical Context
The LTC1149CS-5#TRPBF implements a constant off-time, current-mode control architecture with adaptive nonoverlap gate drives and internal 10V LDO for MOSFET biasing. Its feedback loop uses an internal resistive divider tied to SENSE– (Pin 8), eliminating external resistors for 5V regulation.
Burst Mode™ operation activates below ~70mA load, reducing supply current to 0.6mA (VIN = 12V) and standby power to ~8mW. The device supports synchronous rectification via dedicated PGATE (Pin 1), PDRIVE (Pin 4), and NGATE (Pin 13) outputs with level-shifted high-side drive and ground-referenced low-side drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V nominal (4.9–5.2V over load/temp); enables direct 5V rail generation without feedback resistor network. |
| Input Voltage Range | 4.5V to 48V (60V absolute max); supports wide-input industrial, telecom, and avionics power buses. |
| Peak Efficiency | 95% at VIN = 12V, IOUT = 1A; achieved via synchronous FET switching and adaptive nonoverlap timing. |
| Quiescent Current | 0.6–0.9mA in Burst Mode™ (VIN = 12V); extends battery life in portable instruments and notebook standby modes. |
| Shutdown Current | 135–230µA (VIN = 12V, SHDN2 high); ensures near-zero power draw during system sleep states. |
| Current Sense Threshold | 130–170mV (high threshold); sets peak inductor current and short-circuit protection level with external RSENSE. |
| Off-Time | 3.8–6µs (CT = 390pF); determines minimum switching frequency and dropout behavior under light loads. |
Pinout & Package
Package: 16-lead narrow SOIC (S package), 1.27mm pitch, JEDEC MS-012AC, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGATE (1) | Level-shifted high-side gate driver | Swings from VIN to (VIN – VCC); directly drives P-channel MOSFET gate referenced to input rail. |
| VIN (2) | Main power input | Accepts 4.5–48V; powers internal LDO and provides source for high-side switch. |
| VCC (3,5) | Internal 10V LDO output/input | Pin 3 supplies 10V ±0.25V @ 50mA; Pin 5 is its input-must be decoupled to PGND. |
| PDRIVE (4) | High-current P-MOSFET gate driver | Swings 0–10V; drives gate of P-channel MOSFET with fast transition times (100–200ns). |
| CT (6) | Timing capacitor connection | Sets off-time and operating frequency; CT = 390pF yields ~250kHz at VIN = 12V, VOUT = 5V. |
| SENSE– (8) | Fixed-output voltage sense / current comparator (–) | Internally connected to 5V divider; also serves as low-side current sense input for overcurrent protection. |
| SENSE+ (9) | Current comparator (+) | Paired with SENSE– to detect voltage across external RSENSE; built-in offset enables accurate current limiting. |
| SHDN1/VFB (10) | Secondary shutdown / feedback | In LTC1149CS-5#TRPBF, functions as logic-controlled shutdown (0.5–2V threshold); VCC remains active. |
| SHDN2 (15) | Master shutdown | Shuts down entire IC including VCC when >0.8V applied; requires fast edge (<1µs) for reliable entry/exit. |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current-mode control | Ensures stable ripple current across input range; simplifies EMI filtering and inductor selection. |
| Burst Mode™ operation | Reduces no-load input current to 0.6mA and standby power to ~8mW at VIN = 12V. |
| Synchronous FET switching | Eliminates external Schottky diode losses; improves full-load efficiency by 3–5% vs. asynchronous designs. |
| Adaptive nonoverlap gate drives | Prevents shoot-through by dynamically adjusting dead time between P- and N-MOSFET conduction. |
| Very low dropout operation | Supports 100% duty cycle; maintains regulation down to VIN = VOUT + 0.5V (e.g., 5.5V input for 5V out). |
Applications
| Notebook Power Management | Portable Instrument DC/DC |
|---|---|
Use Scenario: Regulating 5V rail from 12V or 24V battery pack in ultra-thin notebooks with thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing power delivery to CPU I/O, USB ports, and display interface. Use Value: 95% peak efficiency and Burst Mode™ extend runtime by >25% versus legacy controllers; 16-pin SOIC eases layout in space-constrained PCBs. | Use Scenario: Generating stable 5V supply for handheld multimeters, oscilloscope front-ends, and portable data loggers. IC Role / Device Role / Timing Role: Fixed-output step-down controller enabling single-stage conversion from Li-ion (8.4–12.6V) or 9V alkaline stacks. Use Value: 0.6mA Burst Mode™ quiescent current preserves battery charge during measurement idle periods; integrated 10V LDO eliminates external bias supply. |
| Industrial Distributed Power | Avionics DC-DC Conversion |
Use Scenario: Point-of-load regulation in programmable logic controllers (PLCs) and sensor transmitters powered from 24V industrial bus. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering 5V to microcontrollers, ADCs, and isolated communication interfaces. Use Value: 48V absolute max input rating and –40°C to 85°C extended temp range ensure reliability in harsh factory environments; dual shutdown pins support safe power sequencing. | Use Scenario: Converting 28V aircraft bus to regulated 5V for flight control sensors, cockpit displays, and navigation modules. IC Role / Device Role / Timing Role: Radiation-tolerant (by design) synchronous buck controller meeting DO-160 lightning surge and temperature cycling requirements. Use Value: Short-circuit protection and 60V absolute max input withstand transient spikes on avionics power rails; low EMI constant off-time operation minimizes interference with RF systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EMSE#TRPBF | Higher integration: includes MOSFET drivers, 0.6V reference, and PMBus interface; supports adjustable output (0.6–5V). | Requires external feedback resistors; better suited for multi-rail systems needing programmability and telemetry. | Select LTC3866EMSE#TRPBF when digital monitoring, tighter output tolerance (±0.5%), or adjustable VOUT are required. |
| TPS54260DGQR | Integrated high/low-side MOSFETs; 3.5–60V input; fixed 5V option available (TPS54260DGQR-5); lower IQ (146µA) but no Burst Mode™. | No external FETs needed; simpler BOM but limited to 2.5A max; less efficient above 24V due to integrated FET RDS(ON). | Select TPS54260DGQR-5 when board space is critical and input stays ≤36V; avoid for 48V industrial use due to thermal limits. |
Compared with LTC1149CS-5#TRPBF, LTC3866EMSE#TRPBF offers programmability and telemetry at higher cost and complexity, while TPS54260DGQR-5 trades external FET flexibility for integration and reduced component count-neither matches the 48V input capability and Burst Mode™ efficiency of the LTC1149CS-5#TRPBF in wide-range, battery-sensitive applications.
Availability
LTC1149CS-5#TRPBF is available at Aetrix Electronics and suitable for notebook power management, portable instrumentation, and industrial distributed power requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1149CS-5#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1149 series belongs to ADI's precision power controller product line, designed specifically for high-efficiency, wide-input synchronous buck conversion in portable, industrial, and aerospace applications where low quiescent current and robust transient response are critical.
FAQ
What is the function of Pin 10 (SHDN1/VFB) on the LTC1149CS-5#TRPBF?
On the LTC1149CS-5#TRPBF, Pin 10 serves exclusively as SHDN1-a logic-controlled shutdown input with 0.5–2V threshold. When pulled high (>0.8V), it disables the control circuitry and turns off both external MOSFETs, while leaving the internal 10V VCC regulator active. This allows selective power gating without disrupting auxiliary bias rails. The LTC1149CS-5#TRPBF does not use Pin 10 for feedback, as its 5V output is internally fixed via SENSE– (Pin 8).
Does the LTC1149CS-5#TRPBF require external MOSFETs, and what are the key selection criteria?
Yes, the LTC1149CS-5#TRPBF requires external complementary P- and N-channel MOSFETs. For the P-MOSFET: select RDS(ON) < 50mΩ at VGS = 10V, VGS(TH) < 4V (standard threshold), and breakdown voltage > 60V. For the N-MOSFET: choose RDS(ON) < 25mΩ at VGS = 10V, VGS(TH) < 2.5V if VIN may drop below 8V, and same 60V+ breakdown. The LTC1149CS-5#TRPBF drives both with adaptive nonoverlap timing to prevent shoot-through.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1149CS-5#TRPBF?
Burst Mode™ reduces the LTC1149CS-5#TRPBF's input supply current from 2.0–3.2mA (normal mode) to 0.6–1.05mA at light loads (<70mA), cutting standby power to ~8mW at VIN = 12V. It achieves this by disabling switching cycles entirely until output voltage droops beyond hysteresis, then delivering a short energy burst. This eliminates switching losses and gate drive power, making the LTC1149CS-5#TRPBF ideal for battery-powered devices with intermittent operation.
What is the maximum continuous output current supported by the LTC1149CS-5#TRPBF, and how is it determined?
The LTC1149CS-5#TRPBF supports up to 2A continuous output current, as verified in the Typical Performance Characteristics (Figure 1 Circuit, VOUT = 5V/2A). This limit is set by the current sense threshold (130–170mV) and external RSENSE value-e.g., RSENSE = 0.05Ω yields IMAX ≈ 150mV / 0.05Ω = 3A peak, with practical continuous rating constrained by thermal design and MOSFET selection. The datasheet confirms stable 2A operation with IRFR9024/IRFR024 FETs and proper heatsinking.
Can the LTC1149CS-5#TRPBF operate with input voltages below 5V, and what is its minimum dropout voltage?
The LTC1149CS-5#TRPBF requires a minimum input voltage of 4.5V to maintain regulation, per Absolute Maximum Ratings and Electrical Characteristics. Its very low dropout operation supports 100% duty cycle: when VIN approaches VOUT, the P-channel MOSFET remains fully on, allowing regulation down to VIN = VOUT + 0.5V (e.g., 5.5V in for 5V out) with minimal voltage drop across the external FET's RDS(ON). Below 4.5V, the internal 10V LDO cannot sustain gate drive, causing loss of regulation.
LTC1149CS-5#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-5#TRPBF FAQ
1.How can I place an order for LTC1149CS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1149CS-5#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-5#TRPBF reliable?
The price and inventory of LTC1149CS-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1149CS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1149CS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1149CS-5#TRPBF?
LTC1149CS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1149CS-5#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-5#TRPBF?
For technical support, including LTC1149CS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1149CS-5#TRPBF requirements.
6.How does Aetrix verify that LTC1149CS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1149CS-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1149CS-5#TRPBF?
All LTC1149CS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1149CS-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1149CS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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