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Analog Devices Inc. LTC1148CN#PBF
- Part No.:
- LTC1148CN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1148CN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,860
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Product details
Overview
LTC1148CN#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external complementary MOSFETs in high-efficiency DC/DC conversion. It features constant off-time current-mode architecture, 1.25V feedback reference, 160µA light-load standby current, and supports output voltages of 3.3V or 5V via fixed-output variants. It is used in battery-powered portable instruments requiring ultrahigh efficiency across wide load ranges.
For engineers reviewing the LTC1148CN#PBF datasheet, LTC1148CN#PBF pinout, LTC1148CN#PBF application, or LTC1148CN#PBF equivalent, key selection criteria include its 3.5V–20V input range, adaptive nonoverlap gate drives, Burst Mode™ operation for sub-2mW shutdown power, and compatibility with external RSENSE-programmed current limits up to 2A.
Technical Context
The LTC1148CN#PBF implements a constant off-time current-mode control architecture that sets switching frequency via external CT capacitor and maintains regulation by sensing voltage across an external current-sense resistor between SENSE+ and SENSE− pins. Its dual-mode operation-continuous conduction at medium-to-heavy loads and Burst Mode™ at light loads-enables >95% peak efficiency while holding quiescent current to 160µA.
It integrates adaptive nonoverlap circuitry to prevent shoot-through during P-channel/N-channel MOSFET transitions, supports 100% duty cycle for ultra-low dropout, and uses internal 1.25V reference with ±1% tolerance over temperature to set regulated output via external divider (adjustable version) or internal resistor network (fixed-output versions like LTC1148CN-5).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 20V - supports wide-input industrial and battery systems including 12V rails and Li-ion stacks. |
| Feedback Reference Voltage | 1.25V ±1% - enables precise output regulation with minimal drift over temperature and line. |
| Standby Current | 160µA typical - sustains ultralow power consumption in sleep mode without compromising wake-up response. |
| Shutdown Current | <20µA - reduces system-level standby power to sub-2mW at VIN = 10V, critical for always-on portable devices. |
| Current Sense Threshold | 125–175mV - defines peak inductor current limit; sets maximum output current via RSENSE = 100mV/IMAX. |
| Off-Time Range | 3.8–6µs - determines minimum switching frequency and governs low-dropout behavior near VIN ≈ VOUT. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for handheld and embedded instrumentation environments. |
Pinout & Package
Package: 14-lead narrow SO (SO-14), surface-mount, JEDEC MS-012AC compliant, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-current gate driver output | Drives P-channel MOSFET source-connected switch; swings from VIN to GND; requires low-inductance layout. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and gate drive; must be decoupled locally to PGND with ≥1µF ceramic + bulk capacitance. |
| CT (Pin 4) | Timing capacitor connection | Sets off-time and operating frequency; discharge current scales with VOUT to maintain stable f vs. input/output differential. |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Provides bias for internal analog blocks; must be decoupled to SGND with 1µF ceramic; not for external loading. |
| ITH (Pin 6) | Gain amplifier compensation node | Adjusts current comparator threshold; external RC network here sets loop stability and transient response. |
| SENSE− (Pin 7) | Current sense and feedback reference | Connects to low-side of RSENSE; also serves as internal resistive divider tap for fixed-output versions (e.g., LTC1148CN-5). |
| SENSE+ (Pin 8) | Current comparator positive input | Connects to high-side of RSENSE; built-in offset vs. Pin 7 sets trip threshold (25–175mV range). |
| SHUTDOWN (Pin 10) | Logic-controlled enable/disable | Active-low CMOS input; <0.8V = normal operation, >1.5V = micropower shutdown; tR/tF < 1µs required. |
| SGND (Pin 11) | Small-signal ground reference | Separate return path for feedback and compensation; must route directly to COUT(−) to avoid noise coupling. |
| PGND (Pin 12) | Power ground return | Return for N-DRIVE and CIN(−); connects to N-MOSFET source and input capacitor negative terminal. |
| N-DRIVE (Pin 14) | High-current gate driver output | Drives N-channel synchronous rectifier; swings from GND to VIN; requires tight layout to minimize ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency (>95%) | Enabled by synchronous FET switching and Burst Mode™, minimizing switching and conduction losses across 0–2A load range. |
| Adaptive nonoverlap gate drives | Prevents cross-conduction between P- and N-MOSFETs by sensing driver states, eliminating external dead-time circuits. |
| Very low dropout (100% duty cycle) | Allows regulation down to VIN − VOUT ≈ 0.1V, limited only by RDS(ON) of external MOSFETs and inductor DCR. |
| Logic-controlled micropower shutdown | Reduces total supply current to <20µA, enabling true zero-power hold modes in battery-critical applications. |
| Wide input voltage range (3.5V–20V) | Supports single-cell Li-ion (up to 4.2V), multi-cell alkaline/NiMH, and standard 5V/12V industrial rails without external regulators. |
Applications
| Portable Instruments | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by two AA cells (2.4–3.2V) with 3.3V logic rail requirement. IC Role / Device Role / Timing Role: Controller for synchronous buck converter delivering regulated 3.3V at up to 1.5A with Burst Mode™ extending battery life beyond 100 hours. Use Value: 160µA standby current and <20µA shutdown current preserve battery capacity during measurement intervals and sleep states. | Use Scenario: Wireless sensor node using Li-ion battery (3.0–4.2V) powering 5V RF transceiver and 3.3V microcontroller. IC Role / Device Role / Timing Role: Dual-rail controller supporting both LTC1148CN-3.3 and LTC1148CN-5 configurations to generate stable 3.3V and 5V outputs from single input. Use Value: Constant off-time architecture ensures stable regulation even as battery voltage drops below 3.5V, avoiding brownouts. |
| Notebook Peripherals | DC Power Distribution Systems |
Use Scenario: USB-C powered docking station supplying 5V/3A to external peripherals while deriving internal 3.3V logic rail. IC Role / Device Role / Timing Role: Primary controller for high-current buck stage; interfaces with external Si4431DY/Si4412DY MOSFET pair and 62µH inductor. Use Value: Adaptive nonoverlap and 100% duty cycle operation maintain regulation during USB-C voltage sag (down to 4.75V), preventing peripheral disconnects. | Use Scenario: Industrial I/O module receiving 12–24V DC input and distributing 5V/2A to fieldbus interface and 3.3V/1A to FPGA configuration circuitry. IC Role / Device Role / Timing Role: High-reliability controller managing multiple synchronous buck stages with independent RSENSE and CT tuning per rail. Use Value: Wide 3.5–20V input range and -40°C to 85°C extended temp option (LTC1148HVI-5) ensure robustness across variable plant-floor supplies. |
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#PBF | Rated for 48V max input; identical pinout and architecture but higher voltage stress handling on VIN and SENSE pins. | Required for 24V/48V industrial or automotive input systems where LTC1148CN#PBF's 20V absolute max is insufficient. | Select LTC1149CS#PBF when input may exceed 20V; otherwise LTC1148CN#PBF offers better cost and thermal performance at ≤20V. |
| TPS40200DGQ | Fixed-frequency voltage-mode controller (350kHz); no Burst Mode™; higher quiescent current (2.5mA active, 50µA shutdown). | Suitable for noise-sensitive applications needing predictable EMI profile, but less efficient below 100mA load. | Choose TPS40200DGQ if deterministic switching frequency is mandatory; LTC1148CN#PBF preferred for battery runtime optimization. |
Compared with LTC1149CS#PBF, LTC1148CN#PBF provides superior light-load efficiency and lower thermal dissipation at ≤20V inputs, while TPS40200DGQ trades Burst Mode™ adaptability for fixed-frequency EMI control-making LTC1148CN#PBF optimal for portable, battery-constrained designs demanding ultralow IQ and wide dynamic range.
Availability
LTC1148CN#PBF is available at Aetrix Electronics and suitable for portable instruments, battery-powered digital devices, and notebook peripherals requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC1148CN#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 LTC1148 series belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for battery-operated and low-quiescent-power applications demanding ultrahigh efficiency across three decades of load current.
FAQ
What is the maximum continuous output current supported by the LTC1148CN#PBF?
The LTC1148CN#PBF itself does not deliver output current-it controls external P- and N-channel MOSFETs. Maximum output current depends on selected MOSFETs, inductor, and RSENSE. With appropriate components (e.g., Si4431DY/Si4412DY, 62µH inductor, 0.05Ω RSENSE), the LTC1148CN#PBF-based design reliably delivers 2A continuous output. Peak short-circuit current is ~3A, calculated as 150mV/RSENSE.
Does the LTC1148CN#PBF support fixed 3.3V or 5V output without external feedback resistors?
Yes. The LTC1148CN#PBF is the base part number; fixed-output variants are LTC1148CN-3.3 and LTC1148CN-5. These integrate internal resistor dividers tied to SENSE− and SENSE+, eliminating need for external feedback network. Pin 9 (VFB) is NC on these versions. The base LTC1148CN supports adjustable output via external divider on Pin 9.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1148CN#PBF?
Burst Mode™ reduces switching activity during light loads: the controller enters sleep mode (both MOSFETs off), letting output capacitor supply load current until VOUT drops below hysteresis threshold, then wakes to deliver one switching cycle. This cuts dynamic losses, lowering quiescent current to 160µA and enabling >90% efficiency even at 1mA load-critical for battery longevity in standby.
What package type and lead count does the LTC1148CN#PBF use?
The LTC1148CN#PBF is supplied in a 14-lead narrow SO (SO-14) plastic surface-mount package, compliant with JEDEC MS-012AC outline. It has 14 pins arranged in a single row with 1.27mm pitch; thermal resistance θJA is 110°C/W. This package is distinct from the PDIP (N-package) variant LTC1148CN.
Can the LTC1148CN#PBF be used with input voltages below 3.5V?
No. The absolute minimum input voltage for the LTC1148CN#PBF is 3.5V, as specified in the Absolute Maximum Ratings table and confirmed in Note 7. For sub-3.5V operation (e.g., single-cell Li-ion down to 2.7V), consider the LTC1148L series (e.g., LTC1148LCS-3.3), which is explicitly rated for 3.5V minimum and optimized for low-VIN applications.
LTC1148CN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-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):
- 3.5V ~ 20V
- 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:
- 14-PDIP
LTC1148CN#PBF FAQ
1.How can I place an order for LTC1148CN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148CN#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 LTC1148CN#PBF reliable?
The price and inventory of LTC1148CN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1148CN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148CN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148CN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148CN#PBF?
LTC1148CN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148CN#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 LTC1148CN#PBF?
For technical support, including LTC1148CN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148CN#PBF requirements.
6.How does Aetrix verify that LTC1148CN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148CN#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 LTC1148CN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148CN#PBF?
All LTC1148CN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148CN#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 LTC1148CN#PBF part is unused and in its original packaging.
Return procedure for LTC1148CN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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