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Analog Devices Inc. LTC1149CS-5#PBF
- Part No.:
- LTC1149CS-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1149CS-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,233
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Product details
Overview
LTC1149CS-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 conversion. 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 (0.6–0.9 mA) at light loads - ideal for battery-powered industrial instrumentation and telecom power supplies.
For engineers reviewing the LTC1149CS-5#PBF datasheet, LTC1149CS-5#PBF pinout, LTC1149CS-5#PBF application, or LTC1149CS-5#PBF equivalent, key selection criteria include its constant off-time current-mode architecture, 16-pin narrow SOIC package, 5V fixed-output configuration, 1.25V internal reference, and dual shutdown control (SHDN1 and SHDN2) enabling precise system-level power sequencing.
Technical Context
The LTC1149CS-5#PBF implements a constant off-time current-mode control architecture with adaptive nonoverlap gate drives, where off-time (3.8–6 µs) is set by an external CT capacitor and scales with output voltage. Its internal 10V low-dropout regulator powers gate drivers and control circuitry, while level-shifted PGATE output enables direct drive of high-side P-channel MOSFETs referenced to VIN.
It integrates dual shutdown inputs: SHDN1 (pin 10, 0.5–2 V threshold) disables only control logic while preserving VCC, and SHDN2 (pin 15, 0.8–2 V threshold) shuts down VCC and all circuitry. Current sensing uses a built-in offset between SENSE+ (pin 9) and SENSE− (pin 8), with programmable trip thresholds (25 mV low / 130–170 mV high) determined by external RSENSE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05 V (typical), ±2% tolerance over 5 mA–2 A load - ensures stable rail for microcontrollers and analog circuitry without external feedback divider. |
| Input Voltage Range | –15 V to 60 V absolute max; functional range up to 48 V - supports wide-input industrial and telecom supply rails including 24 V and 48 V systems. |
| Efficiency | Up to 95% at 12 V input / 5 V output / 1 A load - minimizes thermal stress and extends battery life in portable equipment. |
| Quiescent Current | 0.6–0.9 mA in Burst Mode™ at 12 V input - enables multi-day standby in always-on sensor nodes and remote monitoring devices. |
| Shutdown Current | 135–230 µA (VIN = 12 V, SHDN2 high) - allows deep power-down for system-level energy budgeting. |
| Operating Frequency | Set by external CT capacitor; ~250 kHz max (CT = 390 pF, VIN = 10 V) - balances EMI, size, and efficiency for compact PCB layouts. |
| Current Sense Threshold | 130–170 mV (high threshold), 25 mV (low threshold) - defines peak inductor current and short-circuit protection level via RSENSE selection. |
Pinout & Package
Package: 16-pin narrow SOIC (S package), surface-mount, JEDEC MS-012AC compliant, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGATE (1) | Level-shifted high-side gate drive | Swings from VIN to VIN – VCC (≈10 V); directly drives P-channel MOSFET gate referenced to input rail. |
| VIN (2) | Main power input | Accepts –15 V to 60 V; supplies internal LDO and high-side driver; requires robust input filtering. |
| VCC (3) | Internal 10 V regulator output | Provides gate drive and bias for drivers/control logic; not short-circuit protected; must be decoupled near PGND. |
| PDRIVE (4) | High-current P-MOSFET gate driver | Swings from VCC to GND; drives P-MOSFET source via external level-shift network (CAP pin). |
| VCC (5) | Internal regulator input | Supplies regulated 10 V to driver/control blocks; requires local 0.1 µF ceramic bypass to SGND. |
| CT (6) | Timing capacitor connection | Sets off-time and operating frequency; discharge current proportional to VOUT enables input-voltage-adaptive timing. |
| ITH (7) | Gain amplifier compensation node | Adjusts current comparator threshold; connects to RC network for loop stability tuning. |
| SENSE– (8) | Current sense (–) input / internal divider tap | Connects to internal resistive divider for fixed 5 V output; also serves as (–) input to current comparator. |
| SENSE+ (9) | Current sense (+) input | Paired with SENSE– to detect voltage across RSENSE; built-in offset enables accurate current limiting. |
| SHDN1/VFB (10) | Logic-controlled shutdown / feedback | In LTC1149CS-5#PBF: shutdown pin (0.5–2 V threshold); <0.8 V = normal operation; >2 V = disable control logic only. |
| SGND (11) | Small-signal ground | Must be routed separately to COUT (–) terminal to avoid noise coupling into feedback path. |
| PGND (12) | Power ground for drivers | Connects to N-MOSFET source and CIN (–); forms high-current return path for synchronous rectification. |
| NGATE (13) | N-channel MOSFET gate driver | Swings from GND to VCC; drives low-side switch with fast transition times (100–200 ns). |
| RGND (14) | LDO ground reference | Connects to power ground; separates LDO return from noisy power paths to stabilize VCC regulation. |
| SHDN2 (15) | Master shutdown input | 0.8–2 V threshold; high signal disables VCC and entire controller - used for system-level power-off sequencing. |
| CAP (16) | Charge compensation for level shift | Capacitor to VCC supplies charge for internal level-shift capacitor; must exceed PDRIVE bypass capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous FET switching | Enables >95% efficiency by replacing lossy Schottky diode with actively controlled N-channel MOSFET. |
| Burst Mode™ operation | Reduces standby power to ~8 mW at VIN = 12 V by disabling switching during light loads - critical for battery longevity. |
| Adaptive nonoverlap gate drives | Prevents shoot-through by enforcing dead time between P- and N-MOSFET conduction - eliminates external timing components. |
| Ultrahigh input voltage capability | Operates from dropout to 48 V (60 V abs max) using onboard level-shift and regulation - simplifies design for 24/48 V industrial systems. |
| Very low dropout operation | Maintains regulation at 100% duty cycle when VIN approaches VOUT - supports operation down to ~5.5 V input for 5 V output. |
Applications
| Industrial Power Distribution | Telecom Power Supplies |
|---|---|
|
Use Scenario: Distributed 5 V rail generation from 24 V or 48 V backplane in modular PLC I/O modules. IC Role / Device Role / Timing Role: Primary controller for synchronous buck stage driving discrete P/N-MOSFET pair; manages burst mode transitions during variable load demand. Use Value: Delivers 95% efficiency at full load and <1 mA quiescent current in idle state - reduces thermal management burden and enables fanless enclosure design. |
Use Scenario: Point-of-load (POL) conversion for FPGA and DSP cores in 48 V telecom line cards. IC Role / Device Role / Timing Role: Fixed 5 V controller with dual shutdown inputs enabling coordinated power sequencing with upstream supervisors and downstream PMICs. Use Value: Dual SHDN pins allow independent control of logic domain (SHDN1) and full system power (SHDN2), meeting GR-1089 Class B transient immunity requirements. |
| Notebook and Palmtop Computers | Portable Instruments |
|
Use Scenario: Main 5 V system rail in legacy x86-based industrial notebooks powered by 12 V Li-ion packs. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller interfacing with external IRFR9024/IRFR024 MOSFETs per typical application circuit. Use Value: Constant off-time architecture maintains stable ripple current across 12–24 V input range - simplifies EMI filter design and improves transient response during CPU burst loads. |
Use Scenario: Battery-powered handheld multimeter with LCD backlight and precision ADC reference supply. IC Role / Device Role / Timing Role: Fixed-output 5 V regulator delivering clean, low-noise power to analog front-end and display drivers. Use Value: Low 600 µA sleep-mode current extends alkaline battery life beyond 12 months in storage - verified per Figure 1 performance curves. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EMSE-5#PBF | Higher integration: includes integrated gate drivers and 5 V LDO; supports wider VIN (4–38 V); no Burst Mode™, uses pulse-skipping. | Designed for lower-input systems (e.g., 12 V automotive); lacks 48 V input support and true micropower shutdown. | Select when board space is constrained and 48 V operation is unnecessary; verify thermal performance at 2 A continuous load. |
| LM5116MHX/NOPB | Wide VIN (6–100 V); adjustable output; no fixed 5 V version; uses voltage-mode control with external compensation. | Requires external feedback divider and compensation network; higher BOM count; no integrated Burst Mode™ optimization. | Choose for designs needing >48 V input or programmable output; accept added design complexity for extended voltage range. |
Compared with LTC1149CS-5#PBF, LTC3850EMSE-5#PBF offers tighter integration but sacrifices 48 V capability and ultra-low quiescent current, while LM5116MHX/NOPB provides broader input range at the cost of increased layout effort and reduced light-load efficiency.
Availability
LTC1149CS-5#PBF is available at Aetrix Electronics and suitable for industrial power distribution, telecom power supplies, portable instrumentation, and battery-operated digital devices requiring stable component supply and long-term lifecycle support.
Supply support for LTC1149CS-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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LTC product family, known for high-performance analog and power management ICs.
The LTC1149CS-5#PBF belongs to Linear's synchronous buck controller product line, engineered specifically for high-efficiency, wide-input-voltage DC/DC conversion in space-constrained and thermally sensitive applications.
FAQ
What is the maximum input voltage rating for the LTC1149CS-5#PBF?
The LTC1149CS-5#PBF has an absolute maximum input voltage rating of 60 V on the VIN pin (pin 2), with guaranteed operation up to 48 V. Operation at 48 V input is confirmed in the Typical Performance Characteristics (Figure 1 G01) and Electrical Characteristics tables, where efficiency and supply current data are specified at VIN = 48 V.
Does the LTC1149CS-5#PBF require an external feedback resistor divider?
No, the LTC1149CS-5#PBF does not require an external feedback resistor divider. As a fixed-output variant, it uses an internal resistive divider connected to SENSE– (pin 8) to regulate precisely to 5.05 V (typical). The SHDN1/VFB pin (pin 10) functions solely as a shutdown control input in this version.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1149CS-5#PBF?
Burst Mode™ reduces the LTC1149CS-5#PBF's supply current to 0.6–0.9 mA at VIN = 12 V by disabling switching cycles when load current drops below the threshold required for continuous conduction. This cuts standby power to ~8 mW, significantly extending battery life in portable instruments and remote sensors without compromising regulation accuracy.
What is the purpose of the dual shutdown pins (SHDN1 and SHDN2) on the LTC1149CS-5#PBF?
SHDN1 (pin 10) disables only the control logic while leaving the internal 10 V VCC regulator active - useful for partial system sleep. SHDN2 (pin 15) shuts down VCC and all circuitry, reducing total current to 135–230 µA. This dual-control architecture enables flexible power sequencing in complex systems such as telecom line cards and industrial controllers.
Can the LTC1149CS-5#PBF drive both P-channel and N-channel MOSFETs directly?
Yes, the LTC1149CS-5#PBF provides dedicated gate drive outputs: PDRIVE (pin 4) and NGATE (pin 13) deliver high-current, fast-transition (100–200 ns) signals referenced to ground for N-MOSFETs, while PGATE (pin 1) provides level-shifted drive referenced to VIN for P-MOSFETs - eliminating need for external level-shifters or bootstrap circuits.
LTC1149CS-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1149CS-5#PBF FAQ
1.How can I place an order for LTC1149CS-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1149CS-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 LTC1149CS-5#PBF reliable?
The price and inventory of LTC1149CS-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 LTC1149CS-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1149CS-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1149CS-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1149CS-5#PBF?
LTC1149CS-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1149CS-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 LTC1149CS-5#PBF?
For technical support, including LTC1149CS-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1149CS-5#PBF requirements.
6.How does Aetrix verify that LTC1149CS-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1149CS-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 LTC1149CS-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1149CS-5#PBF?
All LTC1149CS-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1149CS-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 LTC1149CS-5#PBF part is unused and in its original packaging.
Return procedure for LTC1149CS-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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