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Analog Devices Inc. LTC1148LCS-3.3#PBF
- Part No.:
- LTC1148LCS-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148LCS-3.3#PBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,354
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Product details
Overview
LTC1148LCS-3.3#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller optimized for fixed 3.3V output, driving external complementary P- and N-channel MOSFETs. It features constant off-time current-mode architecture, Burst Mode™ operation for ultralow quiescent current (160 µA), 95% peak efficiency at 1 A, and supports input voltages from 3.5 V to 12 V. It is used in battery-powered portable instruments requiring high light-load efficiency and low dropout.
For engineers reviewing the LTC1148LCS-3.3#PBF datasheet, LTC1148LCS-3.3#PBF pinout, LTC1148LCS-3.3#PBF application, or LTC1148LCS-3.3#PBF equivalent, key selection criteria include its 3.3 V fixed output, 14-pin SOIC package, 160 µA sleep-mode current, adaptive nonoverlap gate drives, and compatibility with external RSENSE-programmed current limits - all critical for compact, long-life DC/DC designs.
Technical Context
The LTC1148LCS-3.3#PBF implements a constant off-time current-mode control architecture with automatic transition between continuous conduction mode (CCM) and Burst Mode™ based on load demand. Its internal voltage divider fixes VOUT = 3.3 V via SENSE– (Pin 7) and SENSE+ (Pin 8), eliminating need for external feedback resistors.
It integrates adaptive nonoverlap gate drivers for P-DRIVE (Pin 1) and N-DRIVE (Pin 14), preventing shoot-through by enforcing sequencing: P-DRIVE must be high before N-DRIVE can rise, and N-DRIVE must fall before P-DRIVE can go low. Off-time is set by CT (Pin 4) and scaled with VOUT, enabling stable regulation down to 100% duty cycle in dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3% (3.23–3.43 V at 700 mA); internally trimmed, no external resistor required. |
| Input Voltage Range | 3.5 V to 12 V; supports single-cell Li-ion and multi-cell alkaline/battery systems. |
| Quiescent Current | 160 µA in Sleep Mode; enables >1000-hour runtime on coin cells in standby. |
| Peak Efficiency | 95% at 1 A, VIN = 6 V; achieved via synchronous FET switching and low RDS(ON) drive optimization. |
| Shutdown Current | <20 µA (typ. 10–20 µA); logic-controlled shutdown reduces system power to micropower level. |
| Current Sense Threshold | 130–170 mV (typ. 150 mV); sets peak inductor current via external RSENSE for IMAX programming. |
| Off-Time | 3.8–6 µs (CT = 390 pF); determines minimum switching frequency and dropout behavior. |
Pinout & Package
Package: 14-lead narrow SOIC (SO-14), surface-mount, JEDEC MS-012AC compliant, 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. |
| NC (Pin 2) | No connection | Not internally bonded; may be tied to PGND or left floating per layout needs. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and gate drivers; must be decoupled locally with ≥1 µF ceramic + bulk capacitor. |
| CT (Pin 4) | Timing capacitor node | Sets off-time and operating frequency; discharge current proportional to VOUT ensures stable dropout behavior. |
| INTVCC (Pin 5) | Internal 3.3 V supply rail | Regulated internal supply for analog blocks; decouple to SGND with 1 µF ceramic; do not load externally. |
| ITH (Pin 6) | Gain amplifier compensation node | External RC network here sets loop bandwidth and transient response; critical for stability with varying COUT ESR. |
| SENSE– (Pin 7) | Fixed-output voltage reference tap | Internally connected to 3.3 V divider; serves as (–) input to current comparator; defines regulated output point. |
| SENSE+ (Pin 8) | Current sense comparator (+) input | Compares against SENSE– to detect overcurrent; built-in offset enables precise RSENSE-based trip threshold. |
| VFB (Pin 9) | Feedback input (adjustable version only) | Not connected in LTC1148LCS-3.3#PBF; NC in fixed-output variants. |
| SHUTDOWN (Pin 10) | Logic-enable control | Low = normal operation; >0.8 V = shutdown; CMOS-compatible, tR/tF < 1 µs required. |
| SGND (Pin 11) | Small-signal ground reference | Separate return path for INTVCC, ITH, and feedback; must route directly to COUT (–) to avoid noise coupling. |
| PGND (Pin 12) | Power ground return | Return for N-DRIVE, VIN decoupling, and CIN (–); tie to source of N-MOSFET and CIN (–) with low-inductance plane. |
| NC (Pin 13) | No connection | Not internally bonded; may be tied to PGND or left floating. |
| N-DRIVE (Pin 14) | High-current gate driver output | Drives drain of external N-channel MOSFET; swing from GND to VIN; requires tight gate loop layout. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency up to 95% | Synchronous FET switching eliminates Schottky diode loss; maintains >85% efficiency from 20 mA to 2 A. |
| Burst Mode™ operation | Reduces IQ to 160 µA at light loads; extends battery life without sacrificing regulation accuracy or transient response. |
| Adaptive nonoverlap gate drives | Hardware-enforced dead-time prevents shoot-through; eliminates need for external timing components or gate resistors. |
| Very low dropout: 100% duty cycle | Enables regulation down to VIN – VOUT ≈ 0 V; supports operation near battery end-of-discharge (e.g., 3.5 V → 3.3 V). |
| Wide input range: 3.5 V to 12 V | Covers single Li-ion (3.0–4.2 V), dual alkaline (3–3.6 V), and 5 V/12 V rail inputs without external regulators. |
Applications
| Portable Medical Sensors | Notebook Subsystem Power |
|---|---|
Use Scenario: Wearable glucose monitor powered by CR2032 coin cell, requiring 3.3 V for MCU and BLE radio during intermittent 10-second measurement bursts. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating 3.3 V from 3.0–3.3 V battery; manages burst-mode transitions and fast load transients. Use Value: 160 µA sleep current enables >2-year shelf life; 95% efficiency at 100 mA extends active runtime; 100% duty cycle sustains operation below 3.3 V input. | Use Scenario: USB-C peripheral dock supplying 3.3 V to embedded microcontroller, display interface, and USB PD policy engine. IC Role / Device Role / Timing Role: Secondary buck controller deriving 3.3 V from 5 V USB-C VBUS; handles dynamic load steps from 1 mA to 1.5 A during hot-plug events. Use Value: Current-mode control delivers <50 µs load transient recovery; adaptive gate drive prevents shoot-through during rapid enable/disable cycles. |
| Industrial Handheld Scanners | GPS Tracking Modules |
Use Scenario: Rugged barcode scanner using two AA batteries (2.4–3.2 V) powering 3.3 V logic, laser driver, and CMOS imager. IC Role / Device Role / Timing Role: Fixed-output buck controller with integrated current sensing; regulates 3.3 V while supporting pulsed 1.2 A imaging loads. Use Value: Programmable RSENSE sets short-circuit limit to 1.5 A; low dropout allows full functionality until battery reaches 2.4 V. | Use Scenario: Asset tracker with GPS/GNSS receiver, cellular modem, and accelerometer, operating on 3.7 V Li-ion with deep sleep intervals. IC Role / Device Role / Timing Role: Always-on 3.3 V supply for RTC, sensor hub, and wake-up circuitry; interfaces with main PMIC during active periods. Use Value: 20 µA shutdown current minimizes leakage during 99% sleep time; Burst Mode™ eliminates audible switching noise during quiet tracking phases. |
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 core architecture and pinout, but standard (non-L) version with 3.5–18 V input range and higher max VIN (16 V vs 12 V). | Supports wider input rails (e.g., 12 V industrial bus); less suitable for ultra-low-VIN battery systems below 3.5 V. | Select when input exceeds 12 V or higher absolute max rating is needed; otherwise LTC1148LCS-3.3#PBF offers tighter low-VIN optimization. |
| TPS54202DRTT | Integrated FETs (not external), 3.5–17 V input, 2 A output, 2.5 µA shutdown, but no Burst Mode™; uses voltage-mode control. | Lower BOM count and layout complexity; lacks programmable current limit and true micropower light-load efficiency. | Choose for space-constrained designs where integration outweighs efficiency trade-offs; not drop-in due to different topology and pinout. |
Compared with LTC1148CS-3.3#PBF, the LTC1148LCS-3.3#PBF provides guaranteed operation down to 3.5 V with lower thermal resistance in SO-14, while TPS54202DRTT trades external FET flexibility and Burst Mode™ efficiency for monolithic simplicity and faster transient response.
Availability
LTC1148LCS-3.3#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld scanners, GPS tracking modules, and notebook subsystem power requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LTC1148LCS-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1148 series was designed as a family of synchronous buck controllers targeting battery-operated and low-noise portable electronics, emphasizing ultralow quiescent current, high light-load efficiency, and robust external FET drive capability.
FAQ
What is the minimum input voltage supported by the LTC1148LCS-3.3#PBF?
The LTC1148LCS-3.3#PBF supports a minimum input voltage of 3.5 V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This is enabled by the "L" suffix variant, which guarantees operation down to 3.5 V - critical for single-cell Li-ion and alkaline battery applications where voltage drops below 3.6 V under load. Operation below 3.5 V is not characterized or guaranteed for LTC1148LCS-3.3#PBF.
Does the LTC1148LCS-3.3#PBF require external feedback resistors to set the 3.3 V output?
No, the LTC1148LCS-3.3#PBF does not require external feedback resistors. It uses an internal precision voltage divider connected to SENSE– (Pin 7) and SENSE+ (Pin 8) to fix the regulated output at 3.3 V ±3%. This eliminates resistor tolerance errors and saves board space - a key distinction from the adjustable LTC1148 versions that use VFB (Pin 9) with external dividers.
How does the LTC1148LCS-3.3#PBF achieve 100% duty cycle operation?
The LTC1148LCS-3.3#PBF achieves 100% duty cycle by disabling the off-time timer when VIN approaches VOUT, allowing the P-channel MOSFET to remain continuously on. This low-dropout behavior is inherent to its constant off-time architecture and is confirmed in the datasheet's "Very Low Dropout Operation" feature and Figure 1 circuit analysis. It enables regulation even when VIN − VOUT < 100 mV.
What is the purpose of the ITH pin (Pin 6) on the LTC1148LCS-3.3#PBF?
The ITH pin (Pin 6) on the LTC1148LCS-3.3#PBF is the gain amplifier decoupling and compensation node. An external RC network here sets the error amplifier bandwidth and phase margin, directly influencing load transient response and loop stability. Proper ITH compensation is essential when using output capacitors with varying ESR (e.g., polymer vs. electrolytic) and ensures reliable operation across temperature and load conditions.
Can the LTC1148LCS-3.3#PBF be used with only an N-channel MOSFET instead of complementary P/N pairs?
No, the LTC1148LCS-3.3#PBF is specifically designed to drive complementary P-channel (high-side) and N-channel (low-side) external MOSFETs. Its P-DRIVE (Pin 1) and N-DRIVE (Pin 14) outputs have complementary logic and drive strength optimized for this topology. Using only an N-channel high-side switch would require a charge pump or bootstrap circuit - functionality not provided by LTC1148LCS-3.3#PBF.
LTC1148LCS-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
LTC1148LCS-3.3#PBF FAQ
1.How can I place an order for LTC1148LCS-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148LCS-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 LTC1148LCS-3.3#PBF reliable?
The price and inventory of LTC1148LCS-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 LTC1148LCS-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1148LCS-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148LCS-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148LCS-3.3#PBF?
LTC1148LCS-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148LCS-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 LTC1148LCS-3.3#PBF?
For technical support, including LTC1148LCS-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148LCS-3.3#PBF requirements.
6.How does Aetrix verify that LTC1148LCS-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1148LCS-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 LTC1148LCS-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1148LCS-3.3#PBF?
All LTC1148LCS-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148LCS-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 LTC1148LCS-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1148LCS-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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