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Analog Devices Inc. LTC1148HVCN#PBF
- Part No.:
- LTC1148HVCN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1148HVCN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,757
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Product details
Overview
LTC1148HVCN#PBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous step-down switching regulator controller driving external complementary MOSFETs in constant off-time current-mode architecture. It supports 3.5V–20V input, delivers up to 2A output with 5V or 3.3V fixed options, achieves >95% efficiency at full load, and maintains ultralow 160µA standby current in Burst Mode™ operation - ideal for battery-powered portable instruments and GPS systems.
For engineers reviewing the LTC1148HVCN#PBF datasheet, LTC1148HVCN#PBF pinout, LTC1148HVCN#PBF application, or LTC1148HVCN#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency vs. load behavior, exact HV-series voltage limits (20V max VIN), and real-world alternative selection guidance for synchronous buck controller designs requiring wide-input, low-quiescent-power regulation.
Technical Context
The LTC1148HVCN#PBF implements a constant off-time current-mode control architecture with adaptive nonoverlap gate drives, enabling stable regulation across three decades of output current (0–2A) while automatically transitioning between continuous conduction mode and Burst Mode™ below ~300mA. Its off-time is set by an external CT capacitor and dynamically scaled with VOUT to maintain consistent ripple current and frequency stability near dropout.
It features dual high-current drivers (P-DRIVE and N-DRIVE) optimized for external P-channel and N-channel MOSFETs, integrated 1.25V reference with ±1% feedback voltage accuracy, programmable current-sense threshold (25–170mV), and logic-controlled micropower shutdown (<20µA). The HV variant extends absolute maximum VIN to 20V (vs. 16V for standard LTC1148CN), with validated operation up to 18V continuous input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.5V to 20V max - enables direct operation from 12V/15V industrial rails and 19V laptop adapters without pre-regulation. |
| Feedback Voltage | 1.25V ±1% - sets precise output via external resistor divider; fixed-output variants (e.g., LTC1148HVCN-5) internally configure SENSE–/SENSE+ for 5.05V nominal output. |
| Standby Current | 160–250µA in Sleep Mode - reduces no-load power loss to ~2mW at VIN = 10V, critical for always-on portable devices. |
| Shutdown IQ | <22µA - ensures minimal battery drain during system sleep, with CMOS-compatible SHUTDOWN pin threshold (0.55–2V). |
| Current Sense Threshold | 25–170mV - defines peak inductor current limit; user-selectable via RSENSE to support 0.05Ω–0.2Ω sense resistors for 1–4A peak current ranges. |
| Off Time | 3.8–6µs (CT = 390pF) - determines minimum switching period; scales inversely with VOUT to stabilize frequency under varying input/output conditions. |
| Efficiency | >95% at 1A, VIN = 6V, VOUT = 5V - achieved via synchronous FET switching and adaptive gate drive, minimizing conduction and switching losses. |
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 source driver for external P-channel MOSFET gate | Swings from VIN to GND; delivers fast turn-on/turn-off to minimize shoot-through risk and conduction loss. |
| VIN (Pin 3) | Main power supply input | Accepts 3.5–20V; requires local 1µF ceramic + bulk capacitor decoupling to PGND to suppress switching noise. |
| CT (Pin 4) | Timing capacitor connection | Sets off-time and operating frequency; discharge current proportional to VOUT ensures stable fSW across line/load. |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Powers internal circuitry; must be decoupled to SGND with ≥1µF ceramic; not for external loading. |
| ITH (Pin 6) | Gain amplifier compensation node | External RC network here sets loop bandwidth and phase margin; critical for transient response stability. |
| SENSE– (Pin 7) | Inverting input of current comparator & internal VOUT divider tap | For fixed-output versions (e.g., LTC1148HVCN-5), connects to internal 1.25V reference; sets 5.05V output via internal ratio. |
| SENSE+ (Pin 8) | Noninverting input of current comparator | Connected across RSENSE; 25–170mV threshold defines peak inductor current and short-circuit protection level. |
| SHUTDOWN (Pin 10) | Logic-level enable/disable control | 0V = active; >0.8V = shutdown; <22µA quiescent draw; must not float - tie to GND or logic driver. |
| SGND (Pin 11) | Small-signal ground reference | Separate return path for feedback, compensation, and INTVCC decoupling; routed directly to COUT (–) to avoid noise coupling. |
| PGND (Pin 12) | Power ground for drivers and input capacitor | Connects to N-MOSFET source and CIN (–); high di/dt path - must be low-inductance, star-connected to SGND at COUT (–). |
| N-DRIVE (Pin 14) | High-current sink driver for external N-channel MOSFET gate | Swings from GND to VIN; complements P-DRIVE for synchronous rectification and zero-voltage switching benefits. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency (>95%) | Synchronous FET switching eliminates Schottky diode loss; adaptive nonoverlap prevents cross-conduction, preserving efficiency at high currents. |
| Burst Mode™ operation | Automatically engages below ~300mA load, reducing switching losses and holding IQ ≤ 250µA - extends battery runtime in idle/sleep states. |
| Wide 3.5V–20V input range | HV variant supports unregulated 12V/15V/19V rails and automotive transients; absolute max rating of 20V avoids need for external overvoltage clamping. |
| Very low dropout (100% duty cycle) | Constant off-time architecture allows P-MOSFET to remain fully on when VIN ≈ VOUT, enabling regulation down to VIN – VOUT = 0.3V. |
| Short-circuit protection | Current-mode sensing with 150mV threshold limits peak inductor current; automatic tOFF extension during fault prevents thermal runaway. |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
Use Scenario: Battery-powered pulse oximeter with Bluetooth LE connectivity requiring 5V/1.2A for MCU, sensor analog front-end, and RF transceiver. IC Role / Device Role / Timing Role: Primary DC-DC controller regulating 5V rail from single-cell Li-ion (3.0–4.2V) or dual-cell NiMH (2.4–3.0V) with Burst Mode™ extending runtime between charges. Use Value: 160µA Sleep Mode current and >92% efficiency at 100mA load reduce average power draw by 3.5× vs. linear regulators, enabling >72-hour operation on 1200mAh cell. | Use Scenario: Ruggedized barcode scanner operating from 12V vehicle power with cold-cranking tolerance down to 6V. IC Role / Device Role / Timing Role: High-input synchronous buck controller generating stable 3.3V/1.5A for ARM Cortex-M7 processor, image sensor, and motor driver IC. Use Value: 20V absolute max VIN rating and robust short-circuit protection allow direct connection to automotive 12V bus without upstream TVS or pre-regulator, simplifying BOM and layout. |
| GPS Navigation Modules | Test & Measurement Data Loggers |
Use Scenario: Low-noise GNSS receiver module requiring clean 3.3V supply with <50mVP-P ripple and fast load transient response. IC Role / Device Role / Timing Role: Fixed-output LTC1148HVCN-3.3 controller driving Si4431DY/Si4412DY MOSFET pair in compact 2-layer PCB design. Use Value: Constant off-time architecture delivers <10µs recovery from 500mA load step, and 25mV current-sense threshold enables precise current limiting for antenna LNA bias sequencing. | Use Scenario: Field-deployable environmental logger powered by solar-charged LiFePO₄ battery (3.2–3.6V), needing 5V/800mA for microSD card, ADC, and LoRaWAN radio. IC Role / Device Role / Timing Role: Adjustable-output LTC1148HVCN controller configured for 5V using external R1/R2 feedback divider and 0.05Ω RSENSE. Use Value: Wide 3.5–20V input range accommodates variable solar panel output; 1.25V reference accuracy ensures ±1.5% output regulation across temperature, critical for precision ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116PWPR | Wide-input (6–100V) current-mode controller with integrated high-side gate driver; no low-side driver - requires external N-FET driver or diode. | Designed for high-VIN industrial/dc-dc conversion (e.g., 48V telecom); lacks Burst Mode™ and sub-200µA sleep current. | Choose LM5116PWPR only if input exceeds 20V or high-side-only drive suffices; LTC1148HVCN#PBF preferred for battery-powered 5–18V systems demanding ultralow IQ. |
| TPS54202DDCR | Integrated 2A synchronous buck converter (not controller); 4.5–18V input; 145µA quiescent current; no external MOSFET flexibility. | Targeted at space-constrained consumer electronics; no programmable current limit or adjustable frequency via CT pin. | Select TPS54202DDCR for simplified layout and lower component count where 2A integrated solution fits; LTC1148HVCN#PBF chosen when higher efficiency, thermal separation, or custom MOSFET selection is required. |
Compared with LM5116PWPR and TPS54202DDCR, LTC1148HVCN#PBF uniquely combines 20V max input, dual high-current gate drivers, Burst Mode™ for µA-level sleep, and full external MOSFET control - making it optimal for high-efficiency, thermally managed, battery-sensitive synchronous buck designs where flexibility and low-noise operation are prioritized over integration density.
Availability
LTC1148HVCN#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, GPS navigation modules, and test & measurement data loggers requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for LTC1148HVCN#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 LTC1148 series was designed as a family of high-efficiency synchronous buck controllers targeting battery-operated portable electronics - emphasizing ultralow quiescent current, wide input range, and seamless transition between Burst Mode™ and continuous conduction for extended runtime and dynamic load handling.
FAQ
What is the maximum input voltage rating for LTC1148HVCN#PBF?
The LTC1148HVCN#PBF has an absolute maximum input voltage rating of 20V, distinguishing it from the standard LTC1148CN (16V max). This HV rating allows direct interface with 12V/15V/19V unregulated supplies and automotive systems with cold-crank transients, provided continuous operation remains within 3.5V–18V per datasheet specifications. Exceeding 20V risks permanent damage.
Does LTC1148HVCN#PBF support fixed 5V output without external feedback resistors?
Yes - the LTC1148HVCN#PBF is the base part number for the adjustable version, but the pin-compatible LTC1148HVCN-5 variant integrates internal feedback resistors to deliver a nominal 5.05V output (4.90–5.20V over load/temperature). For LTC1148HVCN#PBF itself, external R1/R2 resistors connected to VFB (Pin 9) are required to set the output voltage; Pin 9 is NC on fixed-output variants.
How does Burst Mode™ operation reduce power consumption in LTC1148HVCN#PBF?
Burst Mode™ in LTC1148HVCN#PBF disables switching and places most internal circuitry into sleep state when output voltage reaches regulation, reducing input supply current from 2.3mA (normal mode) to 160–250µA. During sleep, the output capacitor supplies load current until VOUT drops below hysteresis threshold, triggering a regulated burst of switching cycles. This cuts no-load power loss to ~2mW at VIN = 10V, significantly extending battery life in intermittent-use applications.
Can LTC1148HVCN#PBF drive both P-channel and N-channel MOSFETs simultaneously?
Yes - LTC1148HVCN#PBF integrates dedicated high-current P-DRIVE (Pin 1) and N-DRIVE (Pin 14) outputs, each capable of sourcing/sinking sufficient gate charge for discrete MOSFETs. Adaptive nonoverlap circuitry prevents shoot-through by ensuring N-DRIVE turns on only after P-DRIVE fully turns off, and vice versa. This enables true synchronous rectification with external complementary FETs for maximum efficiency.
What is the purpose of the CT pin (Pin 4) in LTC1148HVCN#PBF?
The CT pin (Pin 4) connects to an external timing capacitor that sets the off-time duration in LTC1148HVCN#PBF's constant off-time architecture. Discharge current through CT is proportional to VOUT, causing operating frequency to decrease as VIN approaches VOUT - stabilizing regulation near dropout. Typical values range from 390pF (≈250kHz at VIN=12V) to 1000pF (≈100kHz), with frequency calculable via f = 1 / (1.3×10⁴ × CT × VREG/VOUT).
LTC1148HVCN#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#PBF FAQ
1.How can I place an order for LTC1148HVCN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148HVCN#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#PBF reliable?
The price and inventory of LTC1148HVCN#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148HVCN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148HVCN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148HVCN#PBF?
LTC1148HVCN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148HVCN#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#PBF?
For technical support, including LTC1148HVCN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148HVCN#PBF requirements.
6.How does Aetrix verify that LTC1148HVCN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148HVCN#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148HVCN#PBF?
All LTC1148HVCN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148HVCN#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#PBF part is unused and in its original packaging.
Return procedure for LTC1148HVCN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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