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Analog Devices Inc. LTC1148HVCN-5#PBF
- Part No.:
- LTC1148HVCN-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1148HVCN-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,079
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Product details
Overview
LTC1148HVCN-5#PBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous step-down switching regulator controller driving external complementary MOSFETs to deliver regulated 5V output. It features constant off-time current-mode architecture, ultrahigh efficiency (>95% at 1A), 160µA light-load standby current, 3.5V–20V input range, and adaptive nonoverlap gate drives - optimized for battery-powered portable instrumentation requiring stable 5V rail generation.
For engineers reviewing the LTC1148HVCN-5#PBF datasheet, LTC1148HVCN-5#PBF pinout, LTC1148HVCN-5#PBF application, or LTC1148HVCN-5#PBF equivalent, this page delivers verified technical context, validated pin functions, real-world efficiency curves, confirmed alternative parts with functional trade-offs, and supply-chain support details specific to the LTC1148HVCN-5#PBF variant.
Technical Context
The LTC1148HVCN-5#PBF implements a constant off-time current-mode control architecture with programmable tOFF (4–6 µs typical) set by an external CT capacitor. Its feedback loop uses a 1.25V internal reference and monitors output voltage via SENSE– (Pin 7) for fixed 5V operation, while the current comparator senses differential voltage across RSENSE (Pins 7/8) with 125–175mV threshold range.
Burst Mode™ operation automatically engages below ~300mA load to reduce switching losses, lowering quiescent current to 160–250µA and enabling <2mW standby power at VIN = 10V. Adaptive nonoverlap circuitry prevents shoot-through by enforcing sequencing between P-DRIVE (Pin 1) and N-DRIVE (Pin 14), with driver transition times <200ns under 3000pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V nominal (4.90–5.20V over load/temp); enables direct 5V rail generation without external feedback divider. |
| Input Voltage Range | 3.5V to 20V max; supports wide-input industrial/battery systems including 12V and 18V rails. |
| Efficiency | ≥95% at 1A, VIN = 10V; achieved via synchronous FET switching and Burst Mode™ optimization across 3 decades of load current. |
| Quiescent Current | 160–250µA in Sleep Mode; reduces standby power to <2mW at VIN = 10V, critical for always-on portable devices. |
| Shutdown Current | 10–22µA at VSHUTDOWN = 2.1V; ensures ultra-low leakage during system sleep states. |
| Current Sense Threshold | 125–175mV (typical); sets peak inductor current and short-circuit limit (ISC(PK) ≈ 150mV/RSENSE). |
| Off Time (tOFF) | 4–6 µs (CT = 390pF); determines minimum operating frequency and dropout behavior near VIN ≈ VOUT. |
Pinout & Package
Package: 14-lead narrow SO (SO-14), JEDEC MS-012AC, 150°C max junction temperature, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-current gate driver output | Drives P-channel MOSFET source; swing from VIN to GND; requires low-inductance layout to minimize shoot-through risk. |
| NC (Pin 2) | No connection | May be tied to PGND or SGND per layout best practice; no internal function. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and P-DRIVE; must be decoupled with ≥1µF ceramic + bulk capacitor close to Pin 3 and PGND. |
| CT (Pin 4) | Timing capacitor node | Sets off-time and operating frequency; discharge current proportional to VOUT; CT = 390pF yields ~250kHz at VIN = 10V. |
| INTVCC (Pin 5) | Internal 3.3V regulator output | Supplies bias for analog blocks; decouple to SGND with 1µF ceramic; do not load externally. |
| ITH (Pin 6) | Gain amplifier compensation node | Adjusts current comparator threshold; external RC network provides loop stability and transient response tuning. |
| SENSE– (Pin 7) | Inverting input of voltage & current comparators | Internally connected to resistive divider for 5V regulation; also (–) input of current comparator; connects to shunt resistor low-side. |
| SENSE+ (Pin 8) | Noninverting input of current comparator | Connects to shunt resistor high-side; built-in offset vs Pin 7 sets 125–175mV trip threshold for current limiting. |
| VFB (Pin 9) | Feedback input (adjustable version only) | No connection on LTC1148HVCN-5#PBF; unused in fixed-output variants. |
| SHUTDOWN (Pin 10) | Logic-controlled enable/disable | 0V = normal operation; >0.8V = shutdown; CMOS-compatible; pulls IQ to <22µA; must not float. |
| SGND (Pin 11) | Small-signal ground reference | Return for INTVCC, ITH, SENSE pins; must be routed separately from PGND to COUT(–) to avoid noise coupling. |
| PGND (Pin 12) | Power ground return | Source connection for N-channel MOSFET and CIN(–); ties to high-current paths; separate from SGND. |
| NC (Pin 13) | No connection | May be tied to PGND or SGND; no internal function. |
| N-DRIVE (Pin 14) | High-current gate driver output | Drives N-channel MOSFET drain; swing from GND to VIN; requires low-inductance path to PGND and MOSFET source. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency | Over 95% achievable at 1A due to synchronous FET switching and minimized gate drive losses. |
| Adaptive nonoverlap gate drives | Hardware-enforced dead time prevents simultaneous conduction of P- and N-MOSFETs, eliminating shoot-through risk. |
| Burst Mode™ operation | Automatically reduces switching frequency and quiescent current below ~300mA, maintaining >85% efficiency down to 0mA load. |
| Very low dropout | 100% duty cycle capability enables regulation with VIN – VOUT < 100mV, limited only by RDS(ON) and inductor DCR. |
| Wide input voltage range | 3.5V–20V operation supports 2-cell Li-ion, 12V automotive, and industrial DC distribution without external regulators. |
Applications
| Portable Instrumentation | Battery-Powered Digital Devices |
|---|---|
|
Use Scenario: Handheld multimeters and data loggers powered by 2–3 cell Li-ion batteries (6–12.6V) requiring clean, efficient 5V for microcontroller and ADC rails. IC Role / Device Role / Timing Role: Primary step-down controller generating regulated 5V from variable battery input; manages burst/continuous mode transitions during measurement bursts and sleep intervals. Use Value: 160µA Sleep Mode current extends battery life >3× versus standard controllers; >95% efficiency at 1A minimizes thermal stress in sealed enclosures. |
Use Scenario: Portable barcode scanners and RFID readers using single-cell Li-ion (3.0–4.2V) or dual-cell packs (6–8.4V) with tight thermal budgets. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering 5V to USB-peripheral interface ICs and imaging sensors; maintains regulation during rapid load transients from laser/LED activation. Use Value: Constant off-time architecture ensures fast line/load transient response (<10µs recovery); adaptive nonoverlap prevents MOSFET failure during frequent power cycling. |
| DC Power Distribution Systems | GPS Navigation Units |
|
Use Scenario: Industrial field devices receiving unregulated 12–24V DC from centralized power supplies, needing robust 5V conversion with short-circuit protection. IC Role / Device Role / Timing Role: Controller for discrete synchronous buck stage; handles input surges up to 20V and sustains 2A peak loads during motor actuation or comms bursts. Use Value: Short-circuit protection with extended tOFF limits fault current to ≤2A; 20V absolute max rating eliminates need for input TVS clamping in many cases. |
Use Scenario: Automotive-grade GPS receivers operating from vehicle 12V (9–16V) with cold-crank immunity requirements down to 6V. IC Role / Device Role / Timing Role: Main 5V supply controller supporting RF front-end, baseband processor, and flash memory; maintains regulation during engine cranking dips. Use Value: 3.5V minimum input allows uninterrupted operation during 6V cranking events; Burst Mode™ preserves RTC and GPS almanac memory during ignition-off periods. |
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 | Supports 48V max input (vs 20V); identical pinout, same 5V fixed output and Burst Mode™ operation. | Required for >20V input systems (e.g., 24V/48V industrial rails); higher cost and larger footprint due to HV process. | Select LTC1149CS-5#PBF only when input exceeds 20V; otherwise LTC1148HVCN-5#PBF offers better cost/performance for ≤20V designs. |
| TPS54202DRCT | Integrated 2A FETs (vs external); 4.5–28V input; 5V adjustable via resistor divider; no Burst Mode™ - uses Eco-mode™. | Reduces BOM count and PCB area but limits max output current to 2A and lacks true zero-load efficiency optimization. | Choose TPS54202DRCT for space-constrained designs where 2A is sufficient and external FET flexibility is unnecessary; LTC1148HVCN-5#PBF preferred for >2A, ultra-low-IQ, or HV external FET optimization. |
Compared with LTC1149CS-5#PBF, LTC1148HVCN-5#PBF trades 48V input capability for lower cost and smaller solution size in ≤20V systems; versus TPS54202DRCT, it delivers superior light-load efficiency and higher current scalability via discrete FET selection, at the expense of integration and layout simplicity.
Availability
LTC1148HVCN-5#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-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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial, and automotive markets.
The LTC1148 series was designed as a high-efficiency synchronous buck controller family targeting portable and battery-sensitive applications where ultralow quiescent current and wide input range are critical.
FAQ
What is the maximum input voltage rating for LTC1148HVCN-5#PBF?
The LTC1148HVCN-5#PBF has an absolute maximum input voltage rating of 20V on the VIN pin (Pin 3). Operation is specified from 3.5V to 18V, with reliable regulation maintained up to 20V under transient conditions. Exceeding 20V risks permanent damage per Absolute Maximum Ratings.
Does LTC1148HVCN-5#PBF require external feedback resistors to set the 5V output?
No. The LTC1148HVCN-5#PBF is a fixed-output variant: its internal resistive divider connects to SENSE– (Pin 7) to regulate precisely to 5.05V (4.90–5.20V tolerance). External feedback resistors are only required for the adjustable LTC1148HV version using VFB (Pin 9).
How does Burst Mode™ operation affect efficiency at light loads for LTC1148HVCN-5#PBF?
Burst Mode™ reduces switching frequency and quiescent current to 160–250µA, sustaining >85% efficiency down to 0mA load. This avoids the steep efficiency drop seen in continuous-mode controllers below 100mA, making LTC1148HVCN-5#PBF ideal for intermittently active portable devices.
Can LTC1148HVCN-5#PBF drive logic-level MOSFETs when VIN drops below 8V?
Yes. The LTC1148HVCN-5#PBF's P-DRIVE (Pin 1) swings from VIN to GND and N-DRIVE (Pin 14) from GND to VIN, providing full gate drive voltage regardless of input level. For reliable turn-on below 8V, use logic-level P- and N-MOSFETs with VGS(TH) < 2.5V.
What is the purpose of the SENSE+ and SENSE– pins on LTC1148HVCN-5#PBF?
SENSE– (Pin 7) serves as the inverting input for both the voltage feedback comparator (setting 5V output) and the current comparator. SENSE+ (Pin 8) is the noninverting input of the current comparator; the 125–175mV offset between them defines the current sense threshold across RSENSE, enabling precise peak-current limiting and short-circuit protection.
LTC1148HVCN-5#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-5#PBF FAQ
1.How can I place an order for LTC1148HVCN-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148HVCN-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 LTC1148HVCN-5#PBF reliable?
The price and inventory of LTC1148HVCN-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 LTC1148HVCN-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148HVCN-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148HVCN-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148HVCN-5#PBF?
LTC1148HVCN-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148HVCN-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 LTC1148HVCN-5#PBF?
For technical support, including LTC1148HVCN-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148HVCN-5#PBF requirements.
6.How does Aetrix verify that LTC1148HVCN-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148HVCN-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 LTC1148HVCN-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148HVCN-5#PBF?
All LTC1148HVCN-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148HVCN-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 LTC1148HVCN-5#PBF part is unused and in its original packaging.
Return procedure for LTC1148HVCN-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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