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Analog Devices Inc. LTC1148HVCN-3.3#PBF
- Part No.:
- LTC1148HVCN-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1148HVCN-3.3#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
LTC1148HVCN-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 LTC1148HVCN-3.3#PBF datasheet, LTC1148HVCN-3.3#PBF pinout, LTC1148HVCN-3.3#PBF application, or LTC1148HVCN-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 LTC1148HVCN-3.3#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 RSENSE resistor. Its internal feedback divider fixes VOUT = 3.3V (pins SENSE+ and SENSE−), eliminating need for external resistors.
It automatically transitions between continuous conduction mode (CCM) and Burst Mode™ operation to sustain >90% efficiency from 5mA to 2A load, while limiting quiescent power to 2mW at VIN = 10V, IOUT = 0. Adaptive nonoverlap circuitry prevents shoot-through during P/N-MOSFET switching transitions.
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 network and improves accuracy vs resistor-based solutions. |
| Input Voltage Range | 3.5V to 20V (absolute max) - supports wide-input industrial/battery systems including 12V and 18V rails without external regulators. |
| Efficiency | ≥95% typical at VIN = 6V, IOUT = 1A - achieved via synchronous FET drive and Burst Mode™, reducing light-load losses critical for portable devices. |
| Quiescent Current | 160µA in Burst Mode™, <20µA in shutdown - enables multi-week battery life in always-on sensor nodes and handheld instruments. |
| Switching Architecture | Constant off-time current-mode with adaptive nonoverlap - provides fast transient response (<10µs recovery), inherent short-circuit protection, and no loop compensation required. |
| Package | 14-pin narrow SO (0.150" width) - industry-standard footprint compatible with automated assembly and thermal relief design rules. |
| Operating Temp | 0°C to 70°C ambient - specified for commercial-grade applications including test equipment and consumer electronics. |
Pinout & Package
Package: 14-lead plastic narrow SO (SOIC-N), 0.150" body width, JEDEC MS-012AC. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-current gate driver output | Drives source of external P-channel MOSFET; swing from VIN to GND - requires low-inductance layout to minimize ringing and EMI. |
| NC (Pin 2) | No connection | May be tied to PGND or SGND for mechanical stability; no electrical function. |
| VIN (Pin 3) | Main power input | Accepts 3.5V–20V; must be decoupled with ≥1µF ceramic + bulk capacitor close to pin to suppress switching transients. |
| CT (Pin 4) | Timing capacitor node | External capacitor (e.g., 390pF) sets off-time and operating frequency; discharge current scales with VOUT for dropout compensation. |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Supplies internal circuitry; decouple to SGND with 1µF ceramic - do not load externally. |
| ITH (Pin 6) | Current comparator threshold adjust | Voltage here modulates current-sense trip point; used for loop compensation and soft-start control. |
| SENSE− (Pin 7) | Inverting input of current comparator & feedback divider tap | Internally connected to fixed 3.3V divider - sets regulated output and senses inductor current via RSENSE. |
| SENSE+ (Pin 8) | Noninverting input of current comparator | Senses voltage across RSENSE; built-in offset enables accurate current limiting without external amplification. |
| VFB (Pin 9) | Feedback input (adjustable version only) | No connection on LTC1148HVCN-3.3#PBF - reserved for adjustable variants; leave unconnected or tie to SGND. |
| SHUTDOWN (Pin 10) | Logic-controlled enable/disable | 0V = active; >1.5V = shutdown (IQ < 22µA); CMOS-compatible with tR/tF < 1µs - prevents floating states. |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND to COUT(−); avoids noise coupling into feedback and current sense paths. |
| PGND (Pin 12) | Power ground return | Connects to N-MOSFET source and CIN(−); high di/dt path - keep short and wide 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 output | Drives drain of external N-channel MOSFET; swing from GND to VIN - matched timing with P-DRIVE prevents shoot-through. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency | Over 95% achievable at 1A load due to synchronous FET drive and optimized gate drive timing - reduces thermal stress and extends battery runtime. |
| Burst Mode™ operation | Maintains >90% efficiency down to 5mA load by disabling switching and entering micropower sleep - essential for intermittent-sensing applications. |
| Adaptive nonoverlap gate drives | Hardware-enforced dead time prevents simultaneous conduction of P/N-MOSFETs - eliminates shoot-through risk without external timing components. |
| Very low dropout | 100% duty cycle capability allows regulation with VIN as low as VOUT + 0.3V - supports brownout operation in battery-depleted conditions. |
| Short-circuit protection | Automatic tOFF extension during overload limits peak inductor current and sustains safe average output current - no external current-limit IC needed. |
Applications
| Portable Instrumentation | Battery-Powered Digital Devices |
|---|---|
|
Use Scenario: Handheld multimeter or data logger powered by two alkaline cells (2.4V–3.2V) requiring clean, regulated 3.3V for MCU and ADC. IC Role / Device Role / Timing Role: Primary DC/DC controller generating fixed 3.3V rail from variable battery input using external Si4431DY/Si4412DY MOSFET pair. Use Value: Burst Mode™ extends battery life to >100 hours; 160µA quiescent current minimizes self-discharge; 20V abs max rating accommodates accidental 9V battery insertion. |
Use Scenario: Low-power IoT sensor node with BLE radio, MEMS accelerometer, and flash memory operating from single Li-ion cell (3.0V–4.2V). IC Role / Device Role / Timing Role: Fixed-output buck controller delivering stable 3.3V supply with minimal external components - no feedback resistors required. Use Value: Constant off-time architecture ensures fast load transient response (<5µs) for burst transmissions; synchronous drive achieves >92% efficiency at 200mA peak load. |
| Notebook Subsystem Power | DC Power Distribution Systems |
|
Use Scenario: Secondary 3.3V rail in ultraportable notebook for USB controller, touchpad, and embedded security module fed from 5V or 12V main bus. IC Role / Device Role / Timing Role: High-efficiency intermediate converter replacing linear regulator to reduce heat and improve system thermal margin. Use Value: 20V input rating supports direct connection to 12V bus; 14-pin SO package fits tight board areas; adaptive nonoverlap eliminates need for external gate drivers. |
Use Scenario: Distributed 3.3V supply in industrial PLC backplane where multiple modules draw up to 2A total from shared 12V or 24V input. IC Role / Device Role / Timing Role: Modular buck controller enabling scalable, field-replaceable power stages with consistent 3.3V output tolerance. Use Value: Fixed 3.3V output ensures interoperability across modules; robust 20V abs max rating withstands 24V transients per IEC 61000-4-5; SO package simplifies rework and inventory management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1148CN-3.3#PBF | Same functionality but 16V max input (vs 20V); lower thermal resistance (θJA = 70°C/W in PDIP vs 110°C/W in SO). | Preferred for cost-sensitive, non-HV applications with VIN ≤16V and higher thermal mass PCBs. | Select LTC1148HVCN-3.3#PBF when input may reach 18–20V (e.g., automotive accessory rails or industrial 24V systems with transients). |
| LT3502AEDD-3.3#PBF | Integrated 3.3V buck regulator (no external FETs); 40V max input; 2.2MHz fixed frequency; higher IQ (2.5mA active). | Suitable for space-constrained designs needing fewer external components, but less efficient above 1A and no Burst Mode™. | Choose LTC1148HVCN-3.3#PBF when >1A output, >95% efficiency, or ultra-low IQ (<20µA shutdown) are mandatory. |
Compared with LTC1148CN-3.3#PBF, the LTC1148HVCN-3.3#PBF adds 4V headroom for transient-tolerant designs; versus LT3502AEDD-3.3#PBF, it trades integration for higher efficiency, lower IQ, and flexible external FET selection - critical for thermally constrained or high-reliability applications.
Availability
LTC1148HVCN-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 LTC1148HVCN-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, and communications markets.
The LTC1148 series was designed as a family of synchronous buck controllers targeting high-efficiency, low-quiescent-power DC/DC conversion in portable and battery-critical applications - emphasizing Burst Mode™, wide input range, and robust gate drive.
FAQ
What is the maximum input voltage rating for LTC1148HVCN-3.3#PBF?
The LTC1148HVCN-3.3#PBF has an absolute maximum input voltage rating of 20V on the VIN pin, distinguishing it from standard LTC1148CN variants rated for 16V max. This 20V rating enables reliable operation in 12V and 18V industrial or automotive-derived power buses with transient margins. Operation above 18V should include input clamping per datasheet guidelines. The LTC1148HVCN-3.3#PBF maintains full specification compliance up to 18V continuous input.
Does LTC1148HVCN-3.3#PBF require external feedback resistors to set the 3.3V output?
No - the LTC1148HVCN-3.3#PBF integrates a precision internal voltage divider that fixes the regulated output at 3.3V ±2%. Pins SENSE+ and SENSE− connect directly to the external RSENSE resistor and inductor, eliminating external feedback resistors and associated tolerance errors. This simplifies layout, improves accuracy, and reduces BOM count compared to adjustable versions like LTC1148HVCS or LTC1148HV-3.3.
How does Burst Mode™ operation improve efficiency at light loads in LTC1148HVCN-3.3#PBF?
Burst Mode™ in the LTC1148HVCN-3.3#PBF reduces switching activity during light loads (typically <300mA), lowering dynamic losses and cutting quiescent current to 160µA. Instead of continuous PWM, the controller delivers energy in short bursts, then enters deep sleep - achieving >90% efficiency down to 5mA. This extends battery life significantly in always-on sensor or standby applications where average load current is low.
What external components are mandatory for basic operation of LTC1148HVCN-3.3#PBF?
Mandatory external components for LTC1148HVCN-3.3#PBF include: two complementary MOSFETs (P-channel high-side, N-channel low-side), one current-sense resistor (RSENSE), one timing capacitor (CT), one input capacitor (CIN), one output capacitor (COUT), and one output inductor (L). Optional but recommended: Schottky diode (D1) to prevent N-MOSFET body diode conduction during dead time, and 1µF ceramic on INTVCC. No feedback resistors are needed for the fixed 3.3V version.
Is LTC1148HVCN-3.3#PBF pin-compatible with other LTC1148 variants in the same package?
Yes - all 14-pin narrow SO variants (e.g., LTC1148HVCN-3.3#PBF, LTC1148HVCN-5#PBF, LTC1148CN-3.3#PBF) share identical pinout and footprint. However, internal configuration differs: fixed-output versions tie VFB to NC, while adjustable versions use VFB for feedback. Swapping variants requires verifying RSENSE value, CT capacitor, and output capacitor ESR compatibility - especially since LTC1148HVCN-3.3#PBF is optimized for 3.3V, not 5V, regulation.
LTC1148HVCN-3.3#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
LTC1148HVCN-3.3#PBF FAQ
1.How can I place an order for LTC1148HVCN-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148HVCN-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 LTC1148HVCN-3.3#PBF reliable?
The price and inventory of LTC1148HVCN-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 LTC1148HVCN-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148HVCN-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148HVCN-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148HVCN-3.3#PBF?
LTC1148HVCN-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148HVCN-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 LTC1148HVCN-3.3#PBF?
For technical support, including LTC1148HVCN-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148HVCN-3.3#PBF requirements.
6.How does Aetrix verify that LTC1148HVCN-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148HVCN-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 LTC1148HVCN-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148HVCN-3.3#PBF?
All LTC1148HVCN-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148HVCN-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 LTC1148HVCN-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1148HVCN-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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