My Inquiry
My Account
Analog Devices Inc. LTC1148HVCS-3.3#PBF
- Part No.:
- LTC1148HVCS-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148HVCS-3.3#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,660
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1148HVCS-3.3#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency synchronous step-down switching regulator controller driving external complementary MOSFETs to deliver a fixed 3.3V output. It features constant off-time current-mode architecture, ultrahigh efficiency (>95% at VIN = 6V, IOUT = 1A), 160µA standby current in Burst Mode™, and wide 3.5V–20V input range - ideal for battery-powered portable instrumentation requiring stable low-noise 3.3V rail generation.
For engineers reviewing the LTC1148HVCS-3.3#PBF datasheet, LTC1148HVCS-3.3#PBF pinout, LTC1148HVCS-3.3#PBF application, or LTC1148HVCS-3.3#PBF equivalent, key selection criteria include its HV-rated 20V absolute max input, fixed 3.3V output with ±2% regulation over load/line, adaptive nonoverlap gate drives, and 14-pin narrow SO package compatibility with space-constrained DC/DC designs.
Technical Context
The LTC1148HVCS-3.3#PBF implements a constant off-time current-mode control architecture that dynamically adjusts switching frequency based on input-output differential voltage, enabling stable regulation down to 100% duty cycle in dropout. Its internal feedback divider fixes VOUT = 3.3V, eliminating external resistors while maintaining 1.25V reference accuracy and 0.2µA feedback bias current.
Burst Mode™ operation engages below ~300mA load, reducing quiescent current to 160µA and minimizing light-load losses; shutdown current drops further to <22µA. Adaptive nonoverlap circuitry prevents shoot-through by enforcing dead time between P-DRIVE and N-DRIVE outputs, critical for reliable synchronous FET switching with Si4431DY/Si4412DY or similar MOSFET pairs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.23V–3.43V at 700mA), internally trimmed - eliminates external feedback resistor network and associated layout sensitivity. |
| Input Voltage Range | 3.5V to 20V (absolute max) - supports wide-input industrial/battery systems including 12V nominal rails and extended automotive transients. |
| Efficiency | >95% typical at VIN = 6V, IOUT = 1A - achieved via synchronous FET drive and Burst Mode™, enabling >10-hour runtime in 2000mAh Li-ion portable instruments. |
| Quiescent Current | 160µA in Burst Mode™ (sleep), <22µA in shutdown - enables micropower hold-up during system standby without external LDO bypass. |
| Switching Architecture | Constant off-time current-mode with adaptive CT discharge - provides inherent line/load transient immunity and stable operation across 3-decade load range (1mA–2A). |
| Protection Features | Short-circuit protection with automatic tOFF extension, 100% duty-cycle dropout operation, and logic-controlled shutdown with 0.8V threshold - ensures robustness in unregulated input environments. |
Pinout & Package
Package: 14-lead narrow SO (SO-14), 150 mil width, JEDEC MS-012AC, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-current gate driver for external P-channel MOSFET | Swings from VIN to GND; delivers >1A peak current to drive Si4431DY-type high-side FETs with minimal external components. |
| NC (Pin 2) | No connection | May be tied to PGND or SGND for mechanical stability; no electrical function. |
| VIN (Pin 3) | Main power supply input | Accepts 3.5V–20V; requires local 1µF ceramic + bulk capacitor decoupling directly to PGND to suppress switching noise. |
| CT (Pin 4) | Timing capacitor connection | External capacitor (e.g., 390pF) sets off-time and operating frequency; value scales inversely with fSW and tracks VOUT for dropout compensation. |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Supplies internal circuitry; must be decoupled to SGND with ≥1µF ceramic; not intended for external loading. |
| ITH (Pin 6) | Current comparator threshold control | External RC network here sets gain and loop compensation; critical for stability with varying COUT ESR and inductor values. |
| SENSE– (Pin 7) | Inverting input of current comparator & internal VOUT divider tap | Internally connected to fixed 3.3V divider; also senses shunt voltage drop across RSENSE for peak-current limiting. |
| SENSE+ (Pin 8) | Non-inverting input of current comparator | Paired with Pin 7 to detect current sense voltage; built-in 25mV–150mV threshold window enables precise IMAX setting via RSENSE. |
| VFB (Pin 9) | Feedback input (adjustable version only) | No connection on LTC1148HVCS-3.3#PBF - internally tied off; unused in fixed-output variants. |
| SHUTDOWN (Pin 10) | CMOS-compatible enable/disable control | Logic-low (≤0.8V) enables operation; logic-high (≥1.5V) forces micropower shutdown with <22µA IQ - compatible with microcontroller GPIO. |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND to COUT(–); forms Kelvin return path for feedback and current sense to minimize noise coupling. |
| PGND (Pin 12) | Power ground for drivers and input capacitor | Connects to source of N-MOSFET and CIN(–); high di/dt node requiring short, wide copper pour to minimize ground bounce. |
| NC (Pin 13) | No connection | May be tied to PGND or SGND; no functional role. |
| N-DRIVE (Pin 14) | High-current gate driver for external N-channel MOSFET | Swings from GND to VIN; complements P-DRIVE to form synchronous buck stage with zero-body-diode conduction loss. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency >95% | Enabled by synchronous FET switching and Burst Mode™ - reduces thermal load in sealed enclosures and extends battery life in handheld test gear. |
| Wide 3.5V–20V input range | Supports direct connection to 12V/19V adapters, Li-ion stacks (3S–5S), and industrial 24V rails without pre-regulation - simplifies BOM and board area. |
| Adaptive nonoverlap gate drives | Hardware-enforced dead time prevents shoot-through during P/N-FET transitions - eliminates need for external timing resistors or complex gate driver ICs. |
| Low 160µA Burst Mode™ current | Maintains regulation at µA-level loads (e.g., RTC, sensors) without external LDO - preserves system sleep state integrity and minimizes standby power. |
| 100% duty cycle dropout operation | Regulates down to VIN – VOUT ≈ 0V using only RDS(ON) of external P-FET - essential for maintaining 3.3V rail during brownout conditions in portable medical devices. |
Applications
| Portable Instrumentation | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Handheld multimeter or oscilloscope with dual 3.3V/5V rails powered from 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Primary 3.3V buck controller delivering regulated supply to MCU, ADC, and display interface. Use Value: Burst Mode™ maintains 160µA IQ during measurement standby, extending single-charge runtime beyond 12 hours. |
Use Scenario: Wireless sensor node with BLE SoC and environmental sensors operating from coin-cell or rechargeable LiPo. IC Role / Device Role / Timing Role: Efficient 3.3V power source enabling deep-sleep current <1µA while preserving fast wake-up capability. Use Value: Fixed 3.3V output eliminates feedback resistor errors; 20V abs-max rating accommodates charger IC transients up to 18V. |
| Notebook Subsystems | DC Power Distribution Systems |
Use Scenario: Secondary 3.3V rail for USB-C PD controller, EC, or embedded security module in ultra-thin laptop design. IC Role / Device Role / Timing Role: Compact, high-efficiency point-of-load regulator replacing discrete buck solutions. Use Value: 14-pin SO package fits tight layouts; synchronous drive eliminates Schottky loss, improving thermal margin under 2A peak load. |
Use Scenario: Distributed 3.3V supply in industrial PLC backplane with 24V input and multiple isolated domains. IC Role / Device Role / Timing Role: Robust primary DC/DC controller handling input surges and wide temperature swings (–40°C to 85°C). Use Value: 20V absolute max input withstands 40V transients per ISO 7637-2; shutdown pin enables centralized power sequencing with µC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1148CS-3.3#PBF | Same architecture and pinout, but 16V max VIN (vs. 20V); lower absolute max rating limits use in 18–20V input systems. | Suitable for 5V/12V-only inputs; not recommended where 18V transients or 24V-derived rails occur. | Select LTC1148HVCS-3.3#PBF when input may exceed 16V - e.g., automotive accessory power or industrial 24V supplies. |
| MP2315DJ-LF-Z | Integrated 2A synchronous buck (no external FETs); 4.5–26V input; fixed 3.3V option; higher IQ (250µA) and lower peak efficiency (~92%). | Reduces external component count but lacks programmability and Burst Mode™ depth of LTC1148HV series. | Choose MP2315 for cost-sensitive, space-constrained designs where 2A integrated solution suffices and 160µA IQ is not mandatory. |
Compared with LTC1148CS-3.3#PBF, the LTC1148HVCS-3.3#PBF adds 4V headroom for transient tolerance and enables reliable operation in 18–20V systems; versus MP2315, it trades integration for superior light-load efficiency, external FET flexibility, and proven robustness in high-reliability instrumentation.
Availability
LTC1148HVCS-3.3#PBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered digital devices, and DC power distribution systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1148HVCS-3.3#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and aerospace markets.
The LTC1148HV series was designed specifically for high-efficiency, wide-input synchronous buck control in portable and battery-critical applications - emphasizing ultralow quiescent current, adaptive gate drive, and robust operation across extended temperature and input voltage ranges.
FAQ
What is the maximum input voltage rating for LTC1148HVCS-3.3#PBF?
The LTC1148HVCS-3.3#PBF has an absolute maximum input voltage rating of 20V on the VIN pin (Pin 3), with recommended operating range from 3.5V to 18V. This HV designation distinguishes it from standard LTC1148CS-3.3#PBF (16V max), making LTC1148HVCS-3.3#PBF suitable for applications exposed to 18V transients or derived from 24V systems with minimal input filtering.
Does LTC1148HVCS-3.3#PBF require external feedback resistors to set the output voltage?
No - LTC1148HVCS-3.3#PBF is a fixed-output variant with internal resistor divider configured for 3.3V regulation. Pin 9 (VFB) is NC and unused; SENSE– (Pin 7) connects directly to the internal divider. This eliminates resistor tolerance errors and layout sensitivity, ensuring ±2% output accuracy across temperature and load without external components.
How does Burst Mode™ operation reduce power consumption in LTC1148HVCS-3.3#PBF?
Burst Mode™ in LTC1148HVCS-3.3#PBF disables switching and places most internal circuitry in sleep state when load current falls below ~300mA, reducing input supply current from 2.3mA (normal mode) to 160µA. During sleep, the output capacitor sustains the load; regulation resumes automatically when VOUT drops by comparator hysteresis - enabling multi-hour standby in portable instruments.
What external components are mandatory for basic LTC1148HVCS-3.3#PBF operation?
Mandatory external components for LTC1148HVCS-3.3#PBF include: two complementary MOSFETs (P-channel high-side, N-channel low-side), current sense resistor (RSENSE), timing capacitor (CT), power inductor (L), input capacitor (CIN), and output capacitor (COUT). The fixed 3.3V version omits external feedback resistors, but COUT ESR must remain <2×RSENSE for stable Burst Mode™ operation.
Is LTC1148HVCS-3.3#PBF pin-compatible with other LTC1148 variants in SO-14 package?
Yes - LTC1148HVCS-3.3#PBF shares identical 14-pin narrow SO footprint and pinout with all LTC1148CS and LTC1148HVCN variants, including LTC1148CS-3.3#PBF and LTC1148HVCS-5#PBF. This allows direct PCB replacement within the same family, provided input voltage and output requirements align; however, HV variants must be used where VIN exceeds 16V.
LTC1148HVCS-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-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):
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SO
LTC1148HVCS-3.3#PBF FAQ
1.How can I place an order for LTC1148HVCS-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148HVCS-3.3#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 LTC1148HVCS-3.3#PBF reliable?
The price and inventory of LTC1148HVCS-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1148HVCS-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148HVCS-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148HVCS-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148HVCS-3.3#PBF?
LTC1148HVCS-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148HVCS-3.3#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 LTC1148HVCS-3.3#PBF?
For technical support, including LTC1148HVCS-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148HVCS-3.3#PBF requirements.
6.How does Aetrix verify that LTC1148HVCS-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148HVCS-3.3#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 LTC1148HVCS-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148HVCS-3.3#PBF?
All LTC1148HVCS-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148HVCS-3.3#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 LTC1148HVCS-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1148HVCS-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1148HVCS-3.3#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
