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Analog Devices Inc. LTC1149CS#TRPBF
- Part No.:
- LTC1149CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1149CS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,473
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Product details
Overview
LTC1149CS#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external complementary P- and N-channel MOSFETs in constant off-time current-mode architecture. It supports 48V max input, delivers up to 2A output via external FETs, maintains ≥95% efficiency at full load, and features adaptive nonoverlap gate drives and logic-controlled micropower shutdown. It is used in battery-powered telecom power supplies requiring high efficiency across wide input ranges.
For engineers reviewing the LTC1149CS#TRPBF datasheet, LTC1149CS#TRPBF pinout, LTC1149CS#TRPBF application, or LTC1149CS#TRPBF equivalent, key selection considerations include its 16-pin SOIC package, 10V internal VCC regulator, 25–170mV current sense threshold, Burst Mode™ operation down to ~600µA supply current, and compatibility with 3.3V/5V fixed-output variants LTC1149CS-3.3#TRPBF and LTC1149CS-5#TRPBF.
Technical Context
The LTC1149CS#TRPBF implements a constant off-time (COT) current-mode control architecture with automatic Burst Mode™ transition below ~15mV/RSENSE load current. Its off-time is set by an external CT capacitor and scales with VOUT to maintain stable ripple current across input voltage variations.
Onboard level-shifting circuitry enables PGATE drive referenced to VIN (not ground), while PDRIVE and NGATE outputs are ground-referenced for standard P- and N-MOSFET gate drive. The integrated 10V LDO (VCC) powers drivers and control logic, with dropout as low as 250mV at 10mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | –15V to 60V absolute max; functional range up to 48V for reliable operation |
| Output Voltage Options | Adjustable via external feedback divider; fixed 3.3V or 5V versions available (LTC1149CS-3.3#TRPBF / LTC1149CS-5#TRPBF) |
| Current Sense Threshold | 25mV (low trip) to 170mV (high trip); sets peak inductor current and short-circuit limit |
| Internal VCC Regulator | 10V ±0.25V output; powers gate drivers and control circuitry; 50mA max output current |
| Burst Mode Supply Current | 0.6–1.3mA at VIN = 12–48V; reduces standby power to ~8mW at 12V input |
| Shutdown Current | 135–520µA (VIN = 12–48V, SHDN2 = 2V); fully disables VCC and all switching |
| Off-Time (tOFF) | 3.8–6µs (CT = 390pF, ILOAD = 700mA); determines minimum on-time and frequency scaling |
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 P-MOSFET gate driver | Voltage swing from VIN to VIN – VCC; requires external charge compensation capacitor (CAP pin) |
| VIN (2) | Main power input | Accepts –15V to 60V; supplies PGATE and internal regulators |
| VCC (3) | 10V LDO output | Powers PDRIVE, NGATE, and control logic; not short-circuit protected |
| PDRIVE (4) | High-current P-MOSFET gate driver | Ground-referenced output; drives gate of P-channel FET via external level shift |
| VCC (5) | 10V LDO input | Must be decoupled to PGND with low-ESR ceramic capacitor |
| CT (6) | Timing capacitor connection | Sets off-time and operating frequency; discharge current proportional to VOUT |
| ITH (7) | Gain amplifier decoupling | Adjusts current comparator threshold; influences load transient response |
| SENSE– (8) | Current comparator (–) input / internal divider tap | Connects to internal resistor divider for fixed-output versions; also senses shunt voltage |
| SENSE+ (9) | Current comparator (+) input | Paired with SENSE– to detect voltage across RSENSE; built-in offset sets trip point |
| SHDN1/VFB (10) | Shutdown 1 / feedback input | Fixed-output: logic shutdown (0V = active); adjustable: feedback node for external divider |
| SGND (11) | Small-signal ground | Must be routed separately to COUT (–) to avoid noise coupling into feedback path |
| PGND (12) | Power ground for drivers | Connects to N-MOSFET source and CIN (–); carries high di/dt switching currents |
| NGATE (13) | N-MOSFET gate driver | Ground-referenced output; drives bottom N-channel FET with fast rise/fall times |
| RGND (14) | LDO ground | Connects to system power ground; separates LDO return from noisy PGND |
| SHDN2 (15) | Master shutdown input | Logic-high (>0.8V) disables VCC and all control; requires tr/tf < 1µs |
| CAP (16) | Charge compensation | Capacitor to VCC supplies charge for PGATE level-shift; must exceed PDRIVE capacitor value |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current-mode control | Maintains stable inductor ripple current across wide VIN range; simplifies loop compensation |
| Adaptive nonoverlap gate drive | Prevents shoot-through by sensing PDRIVE/NGATE states before enabling opposite FET |
| Burst Mode™ operation | Reduces quiescent current to ~600µA at light loads; maintains regulation without audible switching |
| Integrated 10V LDO (VCC) | Eliminates need for external bias supply; powers drivers and logic with 250mV dropout at 10mA |
| 48V input capability | Supports industrial and telecom rails (e.g., 24V, 36V, 48V) with robust overvoltage protection |
| Short-circuit protection | Extends tOFF during overload to limit average short-circuit current to ~IMAX |
Applications
| Telecom Power Supplies | Portable Instruments |
|---|---|
Use Scenario: 48V-to-5V conversion in remote radio units with strict thermal and efficiency requirements. IC Role / Device Role / Timing Role: Controller for synchronous buck stage; manages gate timing, current sensing, and burst transitions. Use Value: Enables >95% efficiency at full load and <1.3mA quiescent current in sleep mode-critical for fanless enclosures and extended battery backup. |
Use Scenario: Power management in handheld test equipment with variable battery input (10–36V) and dual 3.3V/5V rails. IC Role / Device Role / Timing Role: Adjustable-output buck controller; regulates output via external feedback while maintaining tight line/load regulation. Use Value: Delivers 40–65mV load regulation over 5–2000mA range and supports ultralow-power shutdown (<520µA), extending runtime between charges. |
| Industrial Power Distribution | Avionics Systems |
Use Scenario: Distributed 24V-to-3.3V conversion in PLC I/O modules with wide ambient temperature range (–40°C to 85°C). IC Role / Device Role / Timing Role: High-voltage buck controller with robust shutdown and thermal-aware current limiting. Use Value: Guaranteed operation across –40°C to 85°C; 125°C junction limit and 110°C/W θJA enable convection-cooled designs in sealed enclosures. |
Use Scenario: DC-DC conversion in airborne communication systems where EMI and reliability are mission-critical. IC Role / Device Role / Timing Role: Synchronous buck controller with precise current sensing and adaptive dead-time control. Use Value: Minimizes electromagnetic emissions via controlled gate transitions and eliminates body-diode conduction loss using synchronous rectification. |
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; internal SENSE– divider replaces external feedback network; identical pinout and timing behavior | Eliminates external resistors for 5V designs; reduces BOM count but loses adjustability | Select when output voltage is fixed at 5V and board space is constrained |
| LTC1149CS-3.3#TRPBF | Fixed 3.3V output; same internal divider topology; shares all timing, protection, and thermal specs with LTC1149CS#TRPBF | Optimized for 3.3V logic rails; avoids resistor tolerance errors in feedback path | Select when output voltage is fixed at 3.3V and highest accuracy under varying load is required |
Compared with LTC1149CS-3.3#TRPBF and LTC1149CS-5#TRPBF, the LTC1149CS#TRPBF provides full output voltage adjustability via external resistors at the cost of two additional components-making it the only choice for non-standard voltages like 2.5V or 1.8V, while retaining identical efficiency, thermal performance, and protection features.
Availability
LTC1149CS#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, portable instruments, and industrial power distribution requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1149CS#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 semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, power, and signal integrity applications.
The LTC1149CS#TRPBF belongs to ADI's legacy Linear Technology switching controller product line, designed specifically for high-efficiency, wide-input-voltage synchronous buck converters in space-constrained, thermally demanding environments.
FAQ
What is the maximum input voltage rating for the LTC1149CS#TRPBF?
The LTC1149CS#TRPBF has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed functional operation up to 48V. Operation beyond 48V risks exceeding safe operating area limits and may trigger internal protection circuits or cause permanent damage. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table.
Does the LTC1149CS#TRPBF integrate MOSFETs or require external ones?
The LTC1149CS#TRPBF is a controller-only IC and requires external complementary P-channel and N-channel power MOSFETs. It does not integrate any power switches. The device drives these external FETs via dedicated PGATE, PDRIVE, and NGATE outputs, enabling optimized selection for voltage, current, and thermal requirements in each application.
How does Burst Mode™ operation work in the LTC1149CS#TRPBF?
In the LTC1149CS#TRPBF, Burst Mode™ activates automatically when load current drops below ~15mV/RSENSE. During this mode, the controller stops switching, holds both MOSFETs off, and reduces supply current to ~0.6–1.3mA. When output voltage droops due to load, a burst of switching cycles restores regulation-minimizing idle power without audible noise or excessive output ripple.
What is the purpose of the CAP pin (Pin 16) on the LTC1149CS#TRPBF?
The CAP pin on the LTC1149CS#TRPBF provides charge compensation for the internal level-shift capacitor used in PGATE generation. A capacitor connected from CAP to VCC supplies the transient current needed during VIN transients, preventing PGATE waveform distortion. Its value must exceed that of the PDRIVE decoupling capacitor to ensure reliable high-side drive.
Can the LTC1149CS#TRPBF be used with only an N-channel MOSFET (asynchronous configuration)?
No-the LTC1149CS#TRPBF is designed exclusively for synchronous buck topologies using complementary P- and N-channel MOSFETs. Its gate drive architecture, timing control, and current sensing rely on bidirectional inductor current flow and coordinated high-side/low-side switching. Using only an N-MOSFET with a diode would violate the controller's operational assumptions and likely cause instability or failure.
LTC1149CS#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#TRPBF FAQ
1.How can I place an order for LTC1149CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1149CS#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#TRPBF reliable?
The price and inventory of LTC1149CS#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1149CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1149CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1149CS#TRPBF?
LTC1149CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1149CS#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#TRPBF?
For technical support, including LTC1149CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1149CS#TRPBF requirements.
6.How does Aetrix verify that LTC1149CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1149CS#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1149CS#TRPBF?
All LTC1149CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1149CS#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1149CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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