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Analog Devices Inc. LTC1148CN-3.3#PBF
- Part No.:
- LTC1148CN-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1148CN-3.3#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,424
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Product details
Overview
LTC1148CN-3.3#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller designed to drive external complementary P- and N-channel MOSFETs in high-efficiency DC/DC conversion. It delivers regulated 3.3V output with ±3% accuracy at up to 2A load, supports 3.5V–20V input, achieves >95% peak efficiency, and features Burst Mode™ operation for ultralow 160µA standby current. It is used in battery-powered portable instruments requiring stable low-voltage rails.
For engineers reviewing the LTC1148CN-3.3#PBF datasheet, LTC1148CN-3.3#PBF pinout, LTC1148CN-3.3#PBF application, or LTC1148CN-3.3#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to 14-pin narrow SO, real-world efficiency curves across load and input voltage, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The LTC1148CN-3.3#PBF implements a constant off-time, current-mode control architecture that synchronously switches external MOSFETs at up to 250kHz. Its feedback loop uses an internal 1.25V reference and fixed resistive divider tied to SENSE– (Pin 7), eliminating need for external resistors in the 3.3V version.
Burst Mode™ operation automatically engages below ~300mA load to reduce switching losses, dropping quiescent current to 160µA while maintaining regulation via output capacitor discharge/recharge cycles. Adaptive nonoverlap gate drives prevent shoot-through by enforcing strict sequencing between P-DRIVE (Pin 1) and N-DRIVE (Pin 14) outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.23V–3.43V at 700mA load); eliminates external feedback resistor network. |
| Input Voltage Range | 3.5V to 20V; supports wide battery and industrial supply rails including 5V, 9V, 12V, and 15V sources. |
| Peak Efficiency | ≥95% at VIN = 6V, IOUT = 1A; enables thermally constrained designs without heatsinking. |
| Standby Current | 160µA typical in Burst Mode™; enables multi-week battery life in always-on portable devices. |
| Shutdown Current | <20µA at VSHUTDOWN > 1.5V; ensures near-zero power drain during system sleep states. |
| Current Sense Threshold | 130–170mV (typical); sets peak inductor current via external RSENSE, enabling precise IMAX programming. |
| Off-Time Control | 4–6µs (CT = 390pF); determines minimum switch-off duration and regulates frequency vs. VIN–VOUT. |
Pinout & Package
Package: 14-lead narrow SOIC (SO-14), JEDEC MS-012AC, 150 mil width, 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; swings from VIN to GND; requires low-inductance layout. |
| NC (Pin 2) | No connection | Internally unconnected; may be tied to PGND or SGND for mechanical stability only. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and gate drivers; must be decoupled with ≥1µF ceramic + bulk capacitor. |
| CT (Pin 4) | Timing capacitor node | Sets operating frequency via external capacitor (e.g., 390pF → ~250kHz); discharge current scales with VOUT. |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Provides bias for internal logic; decouple to SGND with 1µF ceramic; do not load externally. |
| ITH (Pin 6) | Current comparator threshold adjust | External RC network here compensates loop dynamics; critical for transient response tuning. |
| SENSE– (Pin 7) | Fixed-output feedback node | Internally connected to 3.3V divider; serves as (–) input to current comparator; ties to RSENSE low side. |
| SENSE+ (Pin 8) | Current sense positive input | (+) input to current comparator; connects to RSENSE high side; built-in offset enables accurate trip point. |
| VFB (Pin 9) | Feedback input (adjustable versions only) | No connection in LTC1148CN-3.3#PBF; reserved for adjustable variants using external resistor divider. |
| SHUTDOWN (Pin 10) | Logic-controlled enable/disable | Active-low: 0V = normal operation; ≥1.5V = micropower shutdown; CMOS-compatible, tR/tF < 1µs required. |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND; connects to COUT (–) and INTVCC decoupling capacitor. |
| PGND (Pin 12) | Power ground return | Return path for N-MOSFET source and CIN (–); tie directly to PCB power plane under IC footprint. |
| NC (Pin 13) | No connection | Internally unconnected; may be tied to PGND or SGND for mechanical stability only. |
| N-DRIVE (Pin 14) | High-current gate driver output | Drives drain of external N-channel MOSFET; swings from GND to VIN; requires low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous FET switching | Eliminates Schottky diode loss; enables >95% efficiency at high loads and low dropout via 100% duty cycle. |
| Burst Mode™ operation | Reduces IQ to 160µA at light loads while maintaining ±1% output regulation; extends battery runtime. |
| Adaptive nonoverlap gate drive | Prevents shoot-through by enforcing dead time between P-DRIVE and N-DRIVE transitions; no external timing needed. |
| Wide input range (3.5V–20V) | Supports single-cell Li-ion (3.0–4.2V), dual-cell alkaline (3–3.6V), and industrial 12V/24V rails without pre-regulation. |
| Short-circuit protection | Extends off-time during overload to limit average short-circuit current to ~IMAX; avoids thermal runaway. |
Applications
| Portable Medical Sensors | Industrial Handheld Scanners |
|---|---|
Use Scenario: Battery-powered glucose meter with OLED display and Bluetooth LE radio. IC Role / Device Role / Timing Role: Primary 3.3V power controller for MCU, sensor interface, and RF transceiver. Use Value: 95% efficiency at 150mA extends AA battery life to >12 months; Burst Mode™ maintains regulation during 10s idle intervals. |
Use Scenario: Ruggedized barcode scanner operating from 3.7V Li-ion with 2A peak motor drive pulses. IC Role / Device Role / Timing Role: High-current 3.3V rail generator supporting ARM Cortex-M7 and CMOS image sensor. Use Value: 2A capability and 100% duty cycle enable stable 3.3V under 1.8V brownout; synchronous design avoids diode heat buildup. |
| GPS Tracking Modules | Wireless IoT Edge Nodes |
Use Scenario: Solar-charged asset tracker with GPS/GNSS receiver and LoRaWAN modem. IC Role / Device Role / Timing Role: Main DC/DC converter supplying 3.3V to GNSS front-end and microcontroller. Use Value: 160µA standby current enables multi-year operation on 1000mAh Li-SOCl₂ cell; wide VIN accommodates solar MPPT output. |
Use Scenario: Battery-operated environmental sensor node with ultra-low-duty-cycle wake-up (10s/hour). IC Role / Device Role / Timing Role: Always-on 3.3V supply for RTC, memory retention, and wake-up circuitry. Use Value: Micropower shutdown <20µA ensures 10-year shelf life; fixed 3.3V simplifies BOM and layout vs. adjustable regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502AEDD-3.3#PBF | Integrated power MOSFETs (no external FETs required); 3.3V fixed; 2.5A max; 3mm × 3mm DFN package. | Lower component count but limited to ≤2.5A; less flexible thermal management; no 100% duty cycle dropout. | Select when board space is critical and load ≤2.5A; avoid if external FET optimization or ultra-low dropout is required. |
| TPS54202DDCR | Integrated FETs; 3.3V adjustable via resistor divider; 2A max; 1.5MHz fixed frequency; smaller 6-pin SOT-23. | Higher switching frequency reduces inductor size but increases EMI; lower efficiency (~90%) at 2A; no Burst Mode™. | Select for compact, cost-sensitive consumer designs where 90% efficiency suffices and continuous mode is acceptable. |
Compared with LT3502AEDD-3.3#PBF and TPS54202DDCR, the LTC1148CN-3.3#PBF offers superior efficiency above 1A, true 100% duty cycle for ultra-low dropout, and full external FET control for thermal and performance optimization-making it preferred for industrial and medical applications demanding reliability over integration density.
Availability
LTC1148CN-3.3#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld scanners, GPS tracking modules, and wireless IoT edge nodes requiring stable component supply with long-term manufacturability.
Supply support for LTC1148CN-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 and maintains full product support, datasheets, and application notes for the LTC portfolio.
The LTC1148 series was designed as a high-efficiency synchronous buck controller targeting battery-powered portable equipment where ultralow quiescent current and wide input voltage range are essential.
FAQ
What is the maximum continuous output current supported by the LTC1148CN-3.3#PBF?
The LTC1148CN-3.3#PBF is a controller-not a regulator with integrated FETs-so its output current is determined by the selected external MOSFETs, inductor, and RSENSE. With appropriate Si4431DY/Si4412DY FETs and 0.05Ω sense resistor, the LTC1148CN-3.3#PBF supports up to 2A continuous output while maintaining regulation and thermal safety per the datasheet's recommended layout and thermal derating guidelines.
Does the LTC1148CN-3.3#PBF require external feedback resistors to set the 3.3V output?
No. The LTC1148CN-3.3#PBF integrates a precision internal resistive divider referenced to a 1.25V bandgap, connecting directly to SENSE– (Pin 7). This eliminates external feedback resistors-reducing BOM count, layout area, and potential drift-while delivering 3.3V ±3% over temperature and line conditions as specified in the Electrical Characteristics table.
How does Burst Mode™ operation affect output voltage ripple in the LTC1148CN-3.3#PBF?
In Burst Mode™, the LTC1148CN-3.3#PBF reduces switching frequency and enters intermittent pulse bursts to maintain regulation at light loads. Output voltage ripple increases to ≤50mVP-P (measured at ILOAD = 0A), which remains within specification and is managed by proper COUT selection (ESR < 2×RSENSE). This trade-off enables 160µA quiescent current without compromising regulation accuracy.
Can the LTC1148CN-3.3#PBF operate with input voltages below 3.5V?
No. The absolute minimum input voltage for the LTC1148CN-3.3#PBF is 3.5V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3.5V violates the specified operating range and may result in failure to regulate or undefined behavior. For sub-3.5V applications, consider the LTC1148L series variants, which are explicitly rated down to 3.5V.
What is the purpose of the ITH pin (Pin 6) on the LTC1148CN-3.3#PBF?
The ITH pin (Pin 6) on the LTC1148CN-3.3#PBF serves as the gain amplifier decoupling point and controls the current comparator threshold. An external RC network here sets loop compensation-directly affecting transient response, phase margin, and stability. Proper ITH network design (e.g., 100kΩ + 3300pF per Figure 1) ensures fast load-step recovery without overshoot or ringing on the LTC1148CN-3.3#PBF output.
LTC1148CN-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
LTC1148CN-3.3#PBF FAQ
1.How can I place an order for LTC1148CN-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148CN-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 LTC1148CN-3.3#PBF reliable?
The price and inventory of LTC1148CN-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 LTC1148CN-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148CN-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148CN-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148CN-3.3#PBF?
LTC1148CN-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148CN-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 LTC1148CN-3.3#PBF?
For technical support, including LTC1148CN-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148CN-3.3#PBF requirements.
6.How does Aetrix verify that LTC1148CN-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148CN-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 LTC1148CN-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148CN-3.3#PBF?
All LTC1148CN-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148CN-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 LTC1148CN-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1148CN-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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