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Analog Devices Inc. LTC1148CS-3.3#TRPBF
- Part No.:
- LTC1148CS-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148CS-3.3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,897
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Product details
Overview
LTC1148CS-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 regulated 3.3V output with ±3% accuracy at up to 2A load, supports 3.5V–20V input range, 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 LTC1148CS-3.3#TRPBF datasheet, LTC1148CS-3.3#TRPBF pinout, LTC1148CS-3.3#TRPBF application, or LTC1148CS-3.3#TRPBF equivalent, key selection criteria include its constant off-time current-mode architecture, adaptive nonoverlap gate drives, 14-pin SOIC package, fixed 3.3V output configuration, and compatibility with external RSENSE-programmable current limits.
Technical Context
The LTC1148CS-3.3#TRPBF implements a constant off-time current-mode control architecture that sets switching frequency via external CT capacitor and maintains regulation by sensing voltage across an external current-sense resistor between SENSE+ and SENSE− pins. Its internal 1.25V reference and fixed internal resistive divider (pins 7/8) establish the 3.3V output without requiring external feedback resistors.
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 circuitry prevents shoot-through by enforcing dead time between P-DRIVE and N-DRIVE transitions, and 100% duty-cycle capability enables ultra-low dropout operation near VIN = VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% at 700mA load - eliminates need for external feedback network. |
| Input Voltage Range | 3.5V to 20V - supports wide-range battery and industrial supply inputs. |
| Peak Efficiency | >95% at 1A, VIN = 6V - enabled by synchronous FET switching and low RDS(ON) drive optimization. |
| Standby Current | 160µA in Burst Mode - reduces no-load power dissipation to ~2mW at VIN = 10V. |
| Shutdown Current | <20µA - logic-controlled micropower shutdown with 0.55–2V threshold on SHUTDOWN pin. |
| Current Sense Threshold | 130–170mV - sets peak inductor current limit; programmable via external RSENSE. |
| Off Time | 3.8–6µs (CT = 390pF) - determines minimum switching period and influences frequency stability. |
Pinout & Package
Package: 14-lead narrow SOIC (SO-14), surface-mount, 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. |
| NC (Pin 2) | No connection | Not internally bonded; may be tied to PGND or left floating. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and P-DRIVE; requires local 1µF ceramic decoupling. |
| CT (Pin 4) | Timing capacitor node | External capacitor (e.g., 390pF) sets off-time and operating frequency. |
| INTVCC (Pin 5) | Internal 3.3V regulator output | Provides bias for internal analog blocks; decouple to SGND with 0.1µF. |
| ITH (Pin 6) | Current comparator threshold control | Voltage here modulates current sense trip point; used for loop compensation. |
| SENSE− (Pin 7) | Inverting input of current comparator / VOUT divider tap | Internally connected to fixed resistive divider for 3.3V regulation; also (−) input for current sensing. |
| SENSE+ (Pin 8) | Noninverting input of current comparator | Connects to shunt resistor high-side; built-in offset enables precise current limit setting. |
| VFB (Pin 9) | Feedback input (adjustable version only) | NC on LTC1148CS-3.3#TRPBF - not connected; internal divider sets output. |
| SHUTDOWN (Pin 10) | Enable/disable control | Logic-low = normal operation; logic-high ≥1.5V = micropower shutdown. |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND to COUT(−) to avoid noise coupling. |
| PGND (Pin 12) | Power ground return | Return path for N-DRIVE and CIN(−); connects to N-MOSFET source and CIN cathode. |
| 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; swings from GND to VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency | Exceeds 95% at full load due to synchronous FET switching and optimized gate drive timing. |
| Adaptive nonoverlap gate drives | Prevents shoot-through by dynamically adjusting dead time between P-DRIVE and N-DRIVE transitions. |
| Burst Mode™ operation | Maintains regulation at light loads (0–300mA) with 160µA quiescent current and minimal output ripple. |
| Very low dropout | Supports 100% duty cycle operation when VIN approaches VOUT, enabling operation down to VIN = VOUT + 0.1V typical. |
| Wide input voltage range | 3.5V–20V operation accommodates single-cell Li-ion (3.0–4.2V) through 18V industrial rails. |
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 system rail controller supplying MCU, sensor interface, and RF transceiver. Use Value: Burst Mode™ extends battery life by reducing no-load power to 2mW; 95% efficiency preserves runtime during active measurement bursts. |
Use Scenario: Ruggedized barcode scanner with 5V motor driver and 3.3V logic core. IC Role / Device Role / Timing Role: Generates clean, regulated 3.3V from 7.4V dual-cell Li-ion pack for ARM Cortex-M4 and CMOS image sensor. Use Value: Constant off-time architecture ensures stable regulation during rapid motor start-up transients; 160µA sleep current enables multi-week standby. |
| GPS Tracking Modules | Wireless IoT Edge Nodes |
|
Use Scenario: Asset tracker using u-blox M8N GNSS module and LTE-M modem. IC Role / Device Role / Timing Role: Supplies 3.3V to GNSS receiver and cellular baseband IC under varying battery voltage (3.4–4.2V). Use Value: 3.5V minimum input allows operation down to deeply discharged Li-ion cells; fixed 3.3V output eliminates calibration drift from resistor tolerance. |
Use Scenario: LoRaWAN environmental sensor node powered by AA batteries and solar harvester. IC Role / Device Role / Timing Role: Provides regulated 3.3V to ultra-low-power microcontroller and digital temperature/humidity sensor during intermittent wake cycles. Use Value: Micropower shutdown (<20µA) enables years of operation on primary cells; adaptive gate drives minimize switching loss at partial load. |
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#TRPBF | Integrated power MOSFETs (no external FETs required); higher 2.5MHz fixed frequency; lower max input (20V same, but tighter thermal limits). | Preferred for space-constrained designs where board area is critical and load ≤500mA. | Select LT3502AEDD-3.3#TRPBF only if integrated FETs simplify layout and thermal management is verified for target load. |
| TPS54202DDCR | Internal FETs; 4.5–17V input; 3.3V fixed output; 2A rated; uses voltage-mode control instead of current-mode. | Better suited for cost-sensitive consumer applications with less stringent transient response requirements. | Choose TPS54202DDCR when BOM simplification outweighs need for Burst Mode™ efficiency at light loads. |
Compared with LT3502AEDD-3.3#TRPBF and TPS54202DDCR, the LTC1148CS-3.3#TRPBF offers superior light-load efficiency via Burst Mode™ and greater design flexibility with external FET selection, but requires more board area and layout expertise for optimal EMI and thermal performance.
Availability
LTC1148CS-3.3#TRPBF 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 lifecycle support.
Supply support for LTC1148CS-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.
The LTC1148 series was developed specifically for high-efficiency, low-quiescent-current synchronous buck controller applications in battery-powered and energy-sensitive systems, emphasizing Burst Mode™ operation and robust gate drive capability.
FAQ
What is the maximum continuous output current supported by the LTC1148CS-3.3#TRPBF?
The LTC1148CS-3.3#TRPBF itself does not deliver current directly-it controls external P- and N-channel MOSFETs. Its current limit is set by the external RSENSE and internal 130–170mV threshold. With appropriate FET selection (e.g., Si4431DY/Si4412DY), the LTC1148CS-3.3#TRPBF-based converter reliably delivers 2A continuous output current while maintaining thermal stability in SO-14 package.
Does the LTC1148CS-3.3#TRPBF require external feedback resistors to set the 3.3V output?
No. The LTC1148CS-3.3#TRPBF integrates a precision internal resistive divider connected to SENSE− (Pin 7) and SENSE+ (Pin 8), establishing a fixed 3.3V output. Unlike the adjustable LTC1148 variants, VFB (Pin 9) is not used and must remain unconnected. This eliminates resistor tolerance errors and improves output accuracy over temperature.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1148CS-3.3#TRPBF?
Burst Mode™ reduces switching activity when load current drops below ~300mA, allowing the output capacitor to supply energy while the controller enters micropower sleep (160µA). The P- and N-channel MOSFETs are fully disabled between bursts, eliminating switching and gate drive losses. This maintains >85% efficiency down to 1mA load-critical for battery longevity in always-on IoT nodes.
Can the LTC1148CS-3.3#TRPBF operate with input voltages below 3.5V?
No. The absolute minimum input voltage for the LTC1148CS-3.3#TRPBF is 3.5V, as specified in the Electrical Characteristics table for the LTC1148L series (which shares the same low-VIN capability). Operation below 3.5V risks failure to regulate or startup, especially at cold temperatures. For sub-3.5V operation, consider the LTC3642 or similar ultra-low-VIN regulators.
What is the purpose of the ITH pin (Pin 6) on the LTC1148CS-3.3#TRPBF?
The ITH pin on the LTC1148CS-3.3#TRPBF serves as the gain amplifier decoupling point and modulates the current comparator threshold voltage. Adding an RC network (e.g., 10kΩ + 100pF) between ITH and SGND provides loop compensation to stabilize the current-mode control loop, suppress subharmonic oscillation, and optimize transient response-especially important when using high-value inductors or low-ESR output capacitors.
LTC1148CS-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
LTC1148CS-3.3#TRPBF FAQ
1.How can I place an order for LTC1148CS-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148CS-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 LTC1148CS-3.3#TRPBF reliable?
The price and inventory of LTC1148CS-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 LTC1148CS-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1148CS-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148CS-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148CS-3.3#TRPBF?
LTC1148CS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148CS-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 LTC1148CS-3.3#TRPBF?
For technical support, including LTC1148CS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148CS-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1148CS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1148CS-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 LTC1148CS-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1148CS-3.3#TRPBF?
All LTC1148CS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148CS-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 LTC1148CS-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1148CS-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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