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Analog Devices Inc. LTC1149CN-5#PBF
- Part No.:
- LTC1149CN-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1149CN-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,875
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Product details
Overview
LTC1149CN-5#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller designed to drive external complementary P-channel and N-channel MOSFETs in high-efficiency DC/DC converters. It delivers regulated 5V output at up to 2A load, supports input voltages up to 48V, achieves up to 95% efficiency, and features Burst Mode™ operation for ultralow quiescent current in light-load conditions - ideal for battery-powered industrial instrumentation and telecom power supplies.
For engineers reviewing the LTC1149CN-5#PBF datasheet, LTC1149CN-5#PBF pinout, LTC1149CN-5#PBF application, or LTC1149CN-5#PBF equivalent, key selection considerations include its fixed 5V output configuration, constant off-time current-mode architecture, 16-pin PDIP package, shutdown threshold compatibility with logic-level signals, and thermal design implications of its 70°C/W junction-to-ambient thermal resistance.
Technical Context
The LTC1149CN-5#PBF implements a constant off-time current-mode control architecture with adaptive nonoverlap gate drives, enabling stable regulation across wide input ranges (6V–48V) while maintaining consistent inductor ripple current. Its internal 10V low-dropout regulator powers gate drivers and control circuitry, and level-shifting circuitry allows PGATE to swing from VIN to VIN – VCC for proper P-MOSFET drive.
Burst Mode™ operation automatically engages below ~70mA load (based on RSENSE = 0.05Ω), reducing supply current to 0.6–0.9mA and standby power to ~8mW at VIN = 12V. The device integrates dual shutdown inputs (SHDN1 and SHDN2), short-circuit protection via current-sense comparator thresholds (130–170mV), and built-in adaptive timing capacitor discharge control to prevent audible switching near dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V nominal (4.9–5.2V over load/temperature), eliminating need for external feedback divider. |
| Input Voltage Range | 6V to 48V continuous (60V absolute max), supporting wide-range industrial and telecom inputs. |
| Efficiency | Up to 95% at 1A load and VIN = 12V, sustained across 5mA–2A due to synchronous FET switching and low driver losses. |
| Shutdown Current | 135–230µA at VIN = 12V, enabling long battery life in portable systems during sleep mode. |
| Off-Time | 4–6µs (typ. 5µs at CT = 390pF), setting operating frequency inversely proportional to (VIN – VOUT). |
| Current Sense Threshold | 130–170mV (high threshold), defining peak inductor current and short-circuit limit (e.g., ~3A ISC(PK) with 0.05Ω RSENSE). |
| Thermal Resistance | θJA = 70°C/W (N-package), requiring heatsinking or airflow above ~1.2W dissipation at TA = 70°C. |
Pinout & Package
Package: 16-lead plastic DIP (N-package), through-hole mounting, 0°C to 70°C commercial temperature range, JEDEC MS-001 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGATE (1) | Level-shifted P-MOSFET gate drive | Swings from VIN to VIN – VCC; requires external capacitor (CAP pin 16) for charge replenishment during transitions. |
| VIN (2) | Main power input | Accepts 6–48V; connects to source of P-MOSFET and bulk input capacitor (CIN). |
| VCC (3) | Internal 10V LDO output | Powers drivers and control logic; not short-circuit protected; must be decoupled with ≥1µF ceramic. |
| PDRIVE (4) | High-current P-MOSFET gate driver | Swings 0–VCC; drives gate via external resistor; referenced to PGND (pin 12). |
| VCC (5) | Internal 10V LDO input | Supplies regulated 10V to driver/control blocks; must be decoupled close to pin 5 and SGND (pin 11). |
| CT (6) | Timing capacitor connection | Sets off-time and operating frequency; discharge current scales with VOUT to stabilize f vs. VIN. |
| ITH (7) | Gain amplifier compensation node | External RC network here sets loop stability; typical value: 1000pF + 1kΩ per Figure 1. |
| SENSE– (8) | Current sense (–) / internal VOUT divider tap | Internally connected to fixed 5V divider; also (–) input of current comparator. |
| SENSE+ (9) | Current sense (+) | (+) input of current comparator; voltage difference vs. SENSE– sets trip threshold (130–170mV). |
| SHDN1/VFB (10) | Logic-controlled shutdown (fixed-output version) | Drives both MOSFETs OFF when >0.8V; must be grounded for normal operation. |
| SGND (11) | Small-signal ground | Reference for feedback, sense, and compensation; must be star-connected to COUT (–) terminal. |
| PGND (12) | Power ground for drivers | Connects to source of N-MOSFET and (–) terminal of CIN; separates high di/dt return paths from SGND. |
| NGATE (13) | N-MOSFET gate driver | Swings 0–VCC; drives gate directly; referenced to PGND (pin 12). |
| RGND (14) | LDO ground | Ground reference for internal 10V regulator; connect to power ground plane. |
| SHDN2 (15) | Master shutdown | Shuts down VCC and all circuitry when >1.4V; requires fast-edge (<1µs) logic signal. |
| CAP (16) | Charge compensation | Capacitor to VCC provides charge for PGATE level-shift; must exceed PDRIVE (pin 4) decoupling cap. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous FET switching | Eliminates external Schottky diode conduction loss, enabling >95% efficiency at full load and reducing thermal stress on N-MOSFET. |
| Adaptive nonoverlap gate drives | Prevents shoot-through by enforcing dead-time between P- and N-MOSFET conduction, ensuring safe commutation without external timing components. |
| Burst Mode™ operation | Reduces quiescent current to <1mA and standby power to ~8mW at VIN = 12V, extending battery runtime in always-on portable devices. |
| Very low dropout operation | Supports 100% duty cycle (P-MOSFET continuously ON) when VIN ≤ VOUT + 1.5V, enabling regulation down to ~6.5V input for 5V output. |
| Ultrahigh input voltage tolerance | Operates up to 48V input (60V abs max) with integrated level-shifting and regulation, simplifying design for 24V/48V industrial and telecom rails. |
| Short-circuit protection | Current-sense comparator triggers automatic off-time extension during overload, limiting average short-circuit current to ~IMAX (e.g., 2A). |
Applications
| Industrial Power Distribution | Portable Instrumentation |
|---|---|
Use Scenario: Distributed 5V rail generation from 24V or 48V factory bus in PLC I/O modules and sensor transmitters. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing power conversion, transient response, and thermal safety. Use Value: Maintains >90% efficiency across 10mA–2A loads and withstands 48V surges, reducing heat sink size and improving system reliability. |
Use Scenario: Main DC/DC converter in handheld test equipment powered by Li-ion batteries (8–16.8V). IC Role / Device Role / Timing Role: Fixed-output 5V regulator enabling low-noise analog front-end and microcontroller operation. Use Value: Burst Mode™ cuts no-load current to <1mA, extending battery life beyond 100 hours in standby without compromising startup time. |
| Telecom Power Supplies | Notebook & Palmtop Computers |
Use Scenario: Intermediate 5V supply in AC/DC adapter secondary side or PoE-powered access points. IC Role / Device Role / Timing Role: High-efficiency step-down controller interfacing with upstream isolation stage and downstream point-of-load regulators. Use Value: 48V input capability and 70°C/W θJA allow compact layout without forced air, meeting NEBS GR-63-CORE shock/vibration requirements. |
Use Scenario: System power rail in legacy x86 or ARM-based sub-notebooks with discrete CPU/GPU power domains. IC Role / Device Role / Timing Role: Primary 5V buck controller delivering clean, regulated power to chipset and peripherals. Use Value: Logic-compatible shutdown pins (SHDN1/SHDN2) enable coordinated power sequencing with embedded controllers and EC firmware. |
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#PBF | Same electrical specs, but in 16-pin narrow SOIC (S-package) with θJA = 110°C/W - higher thermal resistance than N-package. | Preferred for space-constrained PCBs where surface-mount assembly is required; requires careful thermal pad design or airflow. | Select LTC1149CS-5#PBF only if board real estate or assembly process mandates SOIC; verify thermal performance under worst-case ambient + power dissipation. |
| LT3502AEDD-5#PBF | Integrated 5V buck regulator (not controller); includes internal 0.15Ω P-MOSFET and 0.12Ω N-MOSFET; max 1.5A output; 3–40V input. | Suitable for lower-current, cost-sensitive designs where external FETs and layout complexity must be avoided. | Choose LT3502AEDD-5#PBF when output current ≤1.5A and board area is critical; LTC1149CN-5#PBF remains superior for >1.5A, 48V input, or thermal-limited environments. |
Compared with LTC1149CS-5#PBF, the LTC1149CN-5#PBF offers lower thermal resistance (70 vs. 110°C/W) for higher power handling in through-hole layouts; compared with LT3502AEDD-5#PBF, it enables higher current (2A+), wider input (48V), and greater efficiency via optimized external FET selection - at the cost of added component count and layout effort.
Availability
LTC1149CN-5#PBF is available at Aetrix Electronics and suitable for industrial power distribution, portable instrumentation, and telecom power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LTC1149CN-5#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1149 series belongs to Linear's legacy high-voltage synchronous buck controller product line, engineered specifically for efficiency-critical, wide-input industrial and portable power applications where external FET optimization and thermal robustness are essential.
FAQ
What is the maximum input voltage rating for the LTC1149CN-5#PBF?
The LTC1149CN-5#PBF supports continuous operation up to 48V input, with an absolute maximum rating of 60V on the VIN pin. Operation above 48V risks permanent damage, and the internal level-shift circuitry is validated only within the 6V–48V range specified in the datasheet. Designers must ensure transient suppression (e.g., TVS) is used if system-level surges exceed 48V.
Does the LTC1149CN-5#PBF require external MOSFETs, and what types are recommended?
Yes, the LTC1149CN-5#PBF is a controller-not an integrated regulator-and requires external complementary P-channel and N-channel MOSFETs. For VIN > 8V, standard-threshold P-MOSFETs (VGS(TH) < 4V) are acceptable; for lower VIN, logic-level devices (VGS(TH) < 2.5V) are recommended. N-MOSFETs must withstand VIN and exhibit low RDS(ON) and CRSS to optimize efficiency across the 6V–48V input range.
How does Burst Mode™ operation improve light-load efficiency in the LTC1149CN-5#PBF?
Burst Mode™ reduces the LTC1149CN-5#PBF's supply current to 0.6–0.9mA (vs. 2.0–3.2mA in normal mode) by disabling switching cycles when output voltage exceeds regulation, then pulsing briefly to replenish output capacitor charge. This cuts standby power to ~8mW at VIN = 12V, significantly extending battery life in portable applications without sacrificing transient response.
What is the function of the CT pin (Pin 6) on the LTC1149CN-5#PBF?
The CT pin (Pin 6) connects to an external timing capacitor that sets the off-time and thus the operating frequency of the LTC1149CN-5#PBF. Its discharge current scales with VOUT, stabilizing frequency across input voltage changes. With CT = 390pF, typical off-time is 5µs, yielding ~200kHz at VIN = 12V and ~100kHz at VIN = 48V for a 5V output - preventing audible noise near dropout.
Can the LTC1149CN-5#PBF be used in a 5V-only input system, such as USB-powered devices?
No - the LTC1149CN-5#PBF requires minimum 6V input to sustain internal 10V VCC regulation and proper gate drive levels. At VIN = 5V, VCC dropout exceeds specification (200–250mV min), causing unstable operation and potential driver failure. For 5V-input applications, consider the LTC1148 (5V max input) or integrated alternatives like the LT3502A.
LTC1149CN-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
LTC1149CN-5#PBF FAQ
1.How can I place an order for LTC1149CN-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1149CN-5#PBF 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 LTC1149CN-5#PBF reliable?
The price and inventory of LTC1149CN-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1149CN-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1149CN-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1149CN-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1149CN-5#PBF?
LTC1149CN-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1149CN-5#PBF 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 LTC1149CN-5#PBF?
For technical support, including LTC1149CN-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1149CN-5#PBF requirements.
6.How does Aetrix verify that LTC1149CN-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1149CN-5#PBF 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 LTC1149CN-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1149CN-5#PBF?
All LTC1149CN-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1149CN-5#PBF, 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 LTC1149CN-5#PBF part is unused and in its original packaging.
Return procedure for LTC1149CN-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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