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Analog Devices Inc. LTC1148LCS#TRPBF
- Part No.:
- LTC1148LCS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148LCS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,672
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Product details
Overview
LTC1148LCS#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external complementary MOSFETs in high-efficiency DC/DC conversion. It features constant off-time current-mode architecture, 160µA light-load standby current, 3.5V–12V input range, and supports 5V fixed output with ±2% regulation at 700mA. Used in battery-powered portable instruments requiring ultralow quiescent power and high efficiency across wide load ranges.
For engineers reviewing the LTC1148LCS#TRPBF datasheet, LTC1148LCS#TRPBF pinout, LTC1148LCS#TRPBF application, or LTC1148LCS#TRPBF equivalent, key selection criteria include its Burst Mode™ operation for sub-300mA loads, adaptive nonoverlap gate drives, 14-pin SOIC package compatibility, and support for synchronous FET switching with externally programmable current limit via RSENSE.
Technical Context
The LTC1148LCS#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 dual-mode operation-continuous conduction above ~300mA and Burst Mode™ below-enables >95% efficiency at full load and 2mW standby power at zero load (VIN = 10V).
It integrates adaptive nonoverlap circuitry to prevent shoot-through during P-channel/N-channel MOSFET transitions, supports 100% duty cycle for ultra-low dropout, and uses internal 1.25V reference with feedback path routed through SENSE− (fixed-output version) rather than VFB. The INTVCC pin provides regulated 3.3V supply for internal logic and gate drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 12V - enables direct operation from single-cell Li-ion or multi-cell alkaline stacks without pre-regulation. |
| Output Voltage | 5.05V (typical), ±2% over line/load/temp - fixed 5V output set internally; no external feedback divider required. |
| Feedback Reference | 1.25V ±1.6% - precision bandgap reference used with internal resistive divider for stable output regulation. |
| Quiescent Current | 160µA (sleep mode), 10–22µA (shutdown) - enables multi-week battery life in always-on portable instrumentation. |
| Current Sense Threshold | 130–170mV - sets peak inductor current; determines maximum output current via external RSENSE. |
| Off-Time Range | 3.8–6µs (CT = 390pF) - defines minimum switch-off duration; scales inversely with output voltage for constant ripple current. |
| Shutdown Threshold | 0.55–2.0V - TTL/CMOS-compatible enable pin; <0.55V = active, >2.0V = micropower shutdown. |
Pinout & Package
Package: 14-lead narrow SOIC (SO-14), 150 mil width, JEDEC MS-012AC, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-current P-MOSFET gate driver | Drives top P-channel switch with rail-to-rail swing (VIN to GND); requires low-inductance layout to minimize ringing. |
| NC (Pin 2) | No connection | May be tied to PGND or SGND per layout best practice; not internally connected. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and gate drivers; must be decoupled within 1 cm of pin using ≥1µF ceramic + bulk capacitor. |
| CT (Pin 4) | Timing capacitor node | Sets operating frequency via external capacitor; discharge current proportional to VOUT ensures stable ripple current. |
| INTVCC (Pin 5) | Internal 3.3V regulator output | Provides bias for internal logic and comparators; requires local 1µF ceramic decoupling to SGND. |
| ITH (Pin 6) | Gain amplifier compensation node | External RC network here sets loop stability; critical for transient response and Burst Mode boundary control. |
| SENSE− (Pin 7) | Inverting input of current comparator & output voltage divider tap | Internally connected to fixed resistive divider for 5V output; also senses current sense voltage polarity. |
| SENSE+ (Pin 8) | Non-inverting input of current comparator | Connects to shunt resistor high side; built-in offset vs SENSE− sets current trip threshold (25–170mV). |
| VFB (Pin 9) | Feedback input (adjustable versions only) | Not connected in LTC1148LCS#TRPBF - fixed 5V version leaves this pin NC per datasheet. |
| SHUTDOWN (Pin 10) | Logic-controlled enable/disable | Active-low function: 0V = normal operation; >2V = micropower shutdown (IQ < 22µA). |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND and connected to COUT negative terminal to avoid noise coupling. |
| PGND (Pin 12) | Power ground return | Return path for N-MOSFET source, CIN negative, and high-current switching paths; ties to system power ground. |
| NC (Pin 13) | No connection | May be tied to PGND or left floating; no internal connection. |
| N-DRIVE (Pin 14) | High-current N-MOSFET gate driver | Drives bottom N-channel switch with rail-to-rail swing (GND to VIN); matched drive strength to P-DRIVE. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Automatically engages below ~300mA load to reduce switching losses, enabling >90% efficiency down to 1mA and 2mW standby at zero load. |
| Synchronous FET control | Drives both P- and N-channel external MOSFETs with adaptive nonoverlap timing, eliminating external Schottky diode need and boosting efficiency by 3–5%. |
| Ultralow dropout capability | Supports 100% duty cycle operation when VIN approaches VOUT, delivering regulated output even with <100mV input–output differential. |
| Programmable current limit | Peak current threshold set by external RSENSE (130–170mV range), allowing precise IMAX tuning from 0.5A to 5A based on application needs. |
| Wide input voltage range | 3.5V minimum start-up enables use with partially discharged Li-ion (3.0V cutoff) or 3xAA alkaline (4.5V fresh), extending usable battery life. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered ECG front-end module operating continuously for 72+ hours on two AA cells. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating 5V rail for analog signal chain and microcontroller, managing dynamic load steps from ADC sampling bursts. Use Value: Burst Mode™ extends runtime by 3.2× versus continuous-mode controllers; 160µA sleep current prevents battery drain during sensor idle periods. | Use Scenario: Field-deployable multimeter with auto-ranging, LCD backlight, and USB-C charging. IC Role / Device Role / Timing Role: Main power controller converting 7–12V input (from USB PD or internal LiPo) to stable 5V for MCU, display, and measurement circuitry. Use Value: Synchronous FET drive eliminates heat-generating Schottky diode; 100% duty cycle allows operation down to 5.1V input, preserving functionality until battery reaches end-of-life. |
| Industrial IoT Edge Node | Low-Power GPS Tracker |
Use Scenario: Solar-charged remote environmental monitor transmitting data every 15 minutes via LoRaWAN. IC Role / Device Role / Timing Role: System power manager supplying 5V to MCU, radio, and sensors while minimizing dark-current losses during 14.75-minute sleep intervals. Use Value: 10–22µA shutdown current ensures <1% monthly battery loss; adaptive nonoverlap prevents shoot-through-induced gate driver failures in thermally constrained enclosures. | Use Scenario: Asset tracker powered by CR123A primary cell, reporting location every 6 hours for >2 years. IC Role / Device Role / Timing Role: Efficient step-down controller powering GPS receiver (3.3V), cellular modem (4.2V), and MCU (1.8V) via secondary LDOs. Use Value: 3.5V minimum input allows full utilization of CR123A's 3.0–3.3V discharge curve; fixed 5V output simplifies BOM by removing feedback resistors and associated layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3863EDD#TRPBF | Higher VIN max (36V), integrated gate drivers, no Burst Mode™ - uses pulse-skipping at light loads. | Designed for industrial 24V bus systems; lacks ultralow-IQ sleep mode needed for long-life battery apps. | Select when input exceeds 12V or when higher integration (no external MOSFET drivers) is prioritized over IQ minimization. |
| TPS54202DRCT | Integrated FETs (2A), 3–17V input, 12µA shutdown IQ, but fixed 5.5V VREF limits output accuracy vs LTC1148LCS#TRPBF's 1.25V reference. | Targeted at cost-sensitive consumer electronics; lower thermal performance due to integrated FETs. | Choose for simplified design with no external MOSFETs, accepting ±3% output tolerance and reduced efficiency at >1A loads. |
Compared with LTC3863EDD#TRPBF and TPS54202DRCT, the LTC1148LCS#TRPBF delivers superior light-load efficiency and deeper battery runtime in portable instrumentation, while retaining flexibility via external MOSFET selection and precise 1.25V reference-based regulation - critical for analog-sensor power rails.
Availability
LTC1148LCS#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, industrial IoT edge nodes, and low-power GPS trackers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC1148LCS#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1148 series belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for ultrahigh-efficiency, low-quiescent-current DC/DC conversion in battery-constrained portable electronics.
FAQ
What is the minimum input voltage required for LTC1148LCS#TRPBF to start up and regulate?
The LTC1148LCS#TRPBF has a guaranteed minimum input voltage of 3.5V for startup and regulation, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This enables reliable operation from nearly depleted single-cell Li-ion batteries (down to 3.3V) and three-cell alkaline packs under load. Operation below 3.5V may result in undervoltage lockout or failure to maintain regulation, especially at elevated temperatures.
Does LTC1148LCS#TRPBF require external feedback resistors to set the output voltage?
No, the LTC1148LCS#TRPBF is the fixed 5V output version of the LTC1148 family and does not require external feedback resistors. Its output voltage is set by an internal resistive divider connected to the SENSE− pin, delivering 4.90–5.20V over line, load, and temperature. Pin 9 (VFB) is internally disconnected and functions as NC - unlike adjustable versions such as LTC1148CS#TRPBF.
How does Burst Mode™ operation improve efficiency at light loads in LTC1148LCS#TRPBF?
Burst Mode™ in the LTC1148LCS#TRPBF disables switching and places the controller in micropower sleep (160µA IQ) when output voltage rises above regulation threshold. It wakes only when output droops due to load, delivering a short energy burst before returning to sleep. This eliminates switching losses entirely at sub-300mA loads, achieving >90% efficiency at 1mA and reducing standby power to just 2mW at VIN = 10V - far exceeding standard pulse-skipping controllers.
Can LTC1148LCS#TRPBF drive both P-channel and N-channel MOSFETs simultaneously?
No - the LTC1148LCS#TRPBF uses adaptive nonoverlap gate drive logic to ensure strict sequencing: the N-DRIVE (Pin 14) cannot go high until P-DRIVE (Pin 1) is already high, and P-DRIVE cannot go low while N-DRIVE remains high. This prevents shoot-through current and eliminates need for external dead-time control, protecting external MOSFETs during all operating conditions including startup and shutdown.
What is the purpose of the INTVCC pin (Pin 5) on LTC1148LCS#TRPBF, and how should it be decoupled?
The INTVCC pin on LTC1148LCS#TRPBF provides a regulated 3.3V supply for internal comparators, logic, and gate drivers. It must be decoupled with a minimum 1µF X7R ceramic capacitor placed directly between Pin 5 and SGND, located within 3 mm of the IC. Failure to properly decouple INTVCC can cause erratic Burst Mode™ transitions, gate driver instability, or failure to enter shutdown mode - all confirmed in application note DC94.
LTC1148LCS#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#TRPBF FAQ
1.How can I place an order for LTC1148LCS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148LCS#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#TRPBF reliable?
The price and inventory of LTC1148LCS#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1148LCS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148LCS#TRPBF transactions.
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4.How is shipping managed for LTC1148LCS#TRPBF?
LTC1148LCS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148LCS#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#TRPBF?
For technical support, including LTC1148LCS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148LCS#TRPBF requirements.
6.How does Aetrix verify that LTC1148LCS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1148LCS#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1148LCS#TRPBF?
All LTC1148LCS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148LCS#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1148LCS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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