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Analog Devices Inc. LTC1148LCS-3.3#TRPBF
- Part No.:
- LTC1148LCS-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148LCS-3.3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,684
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Product details
Overview
LTC1148LCS-3.3#TRPBF 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 fixed 3.3V output, supports input voltages from 3.5V to 12V, maintains >95% efficiency at full load, features 160µA light-load standby current, and operates with constant off-time current-mode control up to 250kHz. It is used in battery-powered portable instrumentation requiring ultralow quiescent power and stable low-voltage rail generation.
For engineers reviewing the LTC1148LCS-3.3#TRPBF datasheet, LTC1148LCS-3.3#TRPBF pinout, LTC1148LCS-3.3#TRPBF application, or LTC1148LCS-3.3#TRPBF equivalent, key selection criteria include its 3.5V minimum VIN capability (L-series), fixed 3.3V output with ±2% regulation over temperature, adaptive nonoverlap gate drives, Burst Mode™ operation for micropower efficiency below 300mA, and 14-pin narrow SO package compatibility with space-constrained PCB layouts.
Technical Context
The LTC1148LCS-3.3#TRPBF implements a constant off-time current-mode architecture that sets switching frequency via an external CT capacitor and regulates output by comparing sensed voltage across RSENSE (pins 7–8) against a 1.25V internal reference. Its feedback path is internally configured for fixed 3.3V output-pin 9 (VFB) is NC-while SENSE– (pin 7) connects to an internal resistive divider.
Burst Mode™ operation automatically engages below ~300mA load to reduce switching losses, dropping IQ to 160µA; during burst cycles, both external MOSFETs are fully disabled, and output is sustained by COUT. The device includes adaptive nonoverlap logic to prevent shoot-through, 100% duty-cycle dropout capability, and short-circuit protection via extended tOFF during overcurrent events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.23V–3.43V at 700mA, 0°C–70°C) |
| Input Voltage Range | 3.5V to 12V (L-series rating; absolute max 16V) |
| Efficiency | Up to 95% at full load (VIN = 6V–12V, IOUT = 1A–2A) |
| Quiescent Current | 160µA in Burst Mode™ (sleep), 2.1mA typical in active mode |
| Shutdown Current | <20µA (VSHUTDOWN > 1.5V, VIN = 3.5V–12V) |
| Current Sense Threshold | 130–170mV (sets peak inductor current via RSENSE) |
| Switching Frequency | Adjustable up to 250kHz via CT pin (tOFF = 3.8–6µs) |
Pinout & Package
Package: 14-lead narrow SOIC (SO-14), body width 3.9mm, JEDEC MS-012AC, 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 = VIN to GND |
| NC (Pin 2) | No connection | May be tied to PGND or left floating; no internal function |
| VIN (Pin 3) | Main power supply input | Accepts 3.5V–12V; requires local 1µF ceramic decoupling to PGND |
| CT (Pin 4) | Timing capacitor interface | Sets off-time and operating frequency; discharge current ∝ VOUT |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Supplies internal circuitry; decouple to SGND with 1µF ceramic |
| ITH (Pin 6) | Gain amplifier compensation node | External RC network here sets loop stability and transient response |
| SENSE– (Pin 7) | Inverting current sense & feedback node | Internally connected to 3.3V divider; also (–) input of current comparator |
| SENSE+ (Pin 8) | Noninverting current sense input | (+) input of current comparator; offset vs. Pin 7 sets trip threshold |
| VFB (Pin 9) | Feedback input (adjustable version only) | No connection on LTC1148LCS-3.3#TRPBF; internally configured for fixed 3.3V |
| SHUTDOWN (Pin 10) | Logic-controlled enable/disable | <0.8V = normal operation; >1.5V = micropower shutdown (IQ < 20µA) |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND to COUT (–); critical for noise immunity |
| PGND (Pin 12) | Power ground return | Connects to source of N-MOSFET and (–) terminal of CIN; high di/dt path |
| NC (Pin 13) | No connection | 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 = GND to VIN |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency architecture | Synchronous FET switching + Burst Mode™ enables >95% peak efficiency and 2mW standby power at VIN = 10V, IOUT = 0 |
| Low-input-voltage support | 3.5V minimum VIN (L-series) enables direct Li-ion or dual-cell alkaline operation without pre-regulation |
| Adaptive nonoverlap gate drives | Hardware-enforced dead time prevents shoot-through between external P- and N-MOSFETs under all load/temperature conditions |
| Very low dropout operation | 100% duty cycle capability allows regulation down to VIN – VOUT ≈ 0V (limited only by RDS(ON) and PCB resistance) |
| Short-circuit protection | Automatic tOFF extension during overload limits average short-circuit current to ~IMAX while maintaining thermal safety |
Applications
| Portable Instrumentation | Battery-Powered Digital Devices |
|---|---|
|
Use Scenario: Handheld multimeter with LCD, microcontroller, and analog front-end powered from two AA cells. IC Role / Device Role / Timing Role: Primary 3.3V system rail controller managing dynamic load steps from ADC sampling and display backlight pulses. Use Value: Burst Mode™ extends battery life by reducing IQ to 160µA during idle periods; 3.5V start-up ensures operation until cells deplete to ~1.75V each. |
Use Scenario: Wireless sensor node using BLE SoC and low-power MCU, powered by coin cell or small LiPo. IC Role / Device Role / Timing Role: Fixed-output DC/DC controller supplying regulated 3.3V to RF transceiver and digital logic under pulsed transmit loads. Use Value: 95% efficiency at 10–100mA loads preserves energy per transmission; low ESR COUT requirement simplifies compact layout. |
| Notebook Subsystem Power | GPS Module Supply |
|
Use Scenario: Secondary 3.3V rail for embedded security IC or smart card reader in ultra-thin notebook design. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator fed from main 5V or 12V bus, co-located near load. Use Value: 14-pin SOIC footprint fits tight board areas; 110°C/W θJA supports thermally constrained zones without heatsinking. |
Use Scenario: Standalone GPS receiver module requiring clean, stable 3.3V for RF frontend and baseband processor. IC Role / Device Role / Timing Role: Low-noise synchronous buck controller minimizing switching ripple interference with 1.575GHz L1 band reception. Use Value: Constant off-time control provides predictable frequency behavior; SGND/PGND separation reduces ground bounce coupling into GPS analog sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610ACDE#TRPBF | Integrated power stage (no external MOSFETs), 3.4V–42V VIN, 3.3V adjustable via resistor divider | Higher integration reduces BOM count but eliminates flexibility in MOSFET selection and thermal management | Choose LT8610ACDE#TRPBF when board space is critical and 42V max VIN suffices; LTC1148LCS-3.3#TRPBF preferred for >2A loads or custom FET optimization. |
| TPS54202DDCR | Integrated 2A FETs, 4.5V–28V VIN, fixed 3.3V option, 500kHz max fSW, 22µA shutdown IQ | Higher switching frequency enables smaller magnetics but increases gate charge loss at high current | Choose TPS54202DDCR for simpler design with lower component count and better light-load efficiency below 10mA; LTC1148LCS-3.3#TRPBF retains advantage above 300mA and in ultra-low-VIN (3.5V) cases. |
Compared with LT8610ACDE#TRPBF and TPS54202DDCR, the LTC1148LCS-3.3#TRPBF offers unique 3.5V start-up capability, discrete MOSFET control for thermal/power optimization, and Burst Mode™ efficiency retention down to zero load-making it optimal for long-life battery systems where minimum VIN and micropower sleep dominate selection.
Availability
LTC1148LCS-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered digital devices, notebook subsystems, and GPS module supply requiring stable component supply, long-lifecycle availability, and guaranteed parametric compliance across commercial temperature range (0°C to 70°C).
Supply support for LTC1148LCS-3.3#TRPBF 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, serving precision, industrial, automotive, and communications markets.
The LTC1148 series belongs to Linear's legacy high-efficiency DC/DC controller product line, engineered specifically for ultralow-quiescent-current, synchronous step-down conversion in battery-critical portable and instrumentation applications.
FAQ
What is the minimum input voltage supported by the LTC1148LCS-3.3#TRPBF?
The LTC1148LCS-3.3#TRPBF supports a minimum input voltage of 3.5V, enabled by its L-series designation. This allows direct operation from two fresh alkaline cells or a single Li-ion cell down to ~3.5V, making it suitable for long-runtime portable systems where deep discharge utilization is required. Operation below 3.5V is not guaranteed and may result in regulation loss or undefined behavior.
Does the LTC1148LCS-3.3#TRPBF require external feedback resistors to set the output voltage?
No - the LTC1148LCS-3.3#TRPBF is a fixed-output variant with internal feedback divider configured for 3.3V regulation. Pin 9 (VFB) is internally disconnected (NC), and SENSE– (pin 7) connects directly to the internal 3.3V reference network. External resistors are unnecessary and must not be added, as they would disrupt the factory-trimmed feedback path and degrade output accuracy.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1148LCS-3.3#TRPBF?
Burst Mode™ in the LTC1148LCS-3.3#TRPBF disables both external MOSFETs and shuts down most internal circuitry, reducing input supply current to just 160µA. During bursts, the output capacitor supplies load current until VOUT drops below regulation hysteresis, triggering a short switching cycle to recharge COUT. This eliminates switching losses at sub-300mA loads, sustaining >85% efficiency where conventional controllers drop below 60%.
Can the LTC1148LCS-3.3#TRPBF drive logic-level MOSFETs when VIN is as low as 3.5V?
Yes - the LTC1148LCS-3.3#TRPBF's P-DRIVE (pin 1) and N-DRIVE (pin 14) outputs swing rail-to-rail (VIN to GND), delivering full gate drive voltage even at 3.5V input. For reliable turn-on at minimum VIN, use P-MOSFETs with VGS(th) ≤ 2.0V and N-MOSFETs with VGS(th) ≤ 1.5V. The internal adaptive nonoverlap logic ensures safe commutation without shoot-through.
What is the purpose of separate SGND and PGND pins on the LTC1148LCS-3.3#TRPBF?
SGND (pin 11) serves as the quiet reference for analog circuits (error amplifier, comparators, INTVCC LDO), while PGND (pin 12) carries high di/dt return current from the N-MOSFET and input capacitor. Routing them separately - with SGND tied only to COUT (–) and INTVCC decoupling, and PGND tied to CIN (–) and MOSFET sources - prevents noise coupling into the feedback and current-sense paths, ensuring stable regulation and accurate current limiting in the LTC1148LCS-3.3#TRPBF.
LTC1148LCS-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1148LCS-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148LCS-3.3#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1148LCS-3.3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1148LCS-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148LCS-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148LCS-3.3#TRPBF?
LTC1148LCS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148LCS-3.3#TRPBF 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#TRPBF?
For technical support, including LTC1148LCS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148LCS-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1148LCS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1148LCS-3.3#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1148LCS-3.3#TRPBF?
All LTC1148LCS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148LCS-3.3#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1148LCS-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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