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Analog Devices Inc. LTC1148HVCS-3.3#TRPBF
- Part No.:
- LTC1148HVCS-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148HVCS-3.3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,870
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Product details
Overview
LTC1148HVCS-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency synchronous step-down switching regulator controller designed to drive external complementary P- and N-channel MOSFETs in DC/DC conversion stages. It delivers 3.3V output with ±3% regulation over 5mA–2A load, supports 3.5V–20V input, achieves >95% peak efficiency, and maintains ultralow 160µA standby current in Burst Mode™ operation - ideal for battery-powered portable instrumentation and GPS systems requiring extended runtime.
For engineers reviewing the LTC1148HVCS-3.3#TRPBF datasheet, LTC1148HVCS-3.3#TRPBF pinout, LTC1148HVCS-3.3#TRPBF application, or LTC1148HVCS-3.3#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to 14-pin narrow SO, real-world efficiency vs. load curves, and two rigorously cross-checked alternative controllers for fixed 3.3V synchronous buck designs.
Technical Context
The LTC1148HVCS-3.3#TRPBF implements a constant off-time current-mode architecture with adaptive nonoverlap gate drives, enabling precise ripple-current control and stable operation across three decades of output current (0–2A). Its internal voltage divider fixes VOUT = 3.3V via SENSE–/SENSE+ pins, eliminating external feedback resistors.
Burst Mode™ operation automatically engages below ~300mA load to reduce switching losses, dropping quiescent current to 160µA (typical) while maintaining regulation. The device features logic-controlled shutdown (IQ < 22µA), short-circuit protection, and 100% duty-cycle low-dropout capability enabled by synchronous FET switching and adaptive CT discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% at 700mA load - eliminates external resistor divider, reduces BOM count and layout sensitivity. |
| Input Voltage Range | 3.5V to 20V - supports wide-input industrial and automotive auxiliary rails without external LDO pre-regulation. |
| Peak Efficiency | ≥95% at 1A, VIN = 10V - achieved via synchronous FET switching and adaptive nonoverlap timing, minimizing shoot-through loss. |
| Standby Current | 160µA typical in Burst Mode™ - enables >1-year battery life in always-on sensor nodes with intermittent 100mA bursts. |
| Shutdown Current | <22µA at VSHDN = 2.1V - ensures negligible drain during system sleep, critical for IoT endpoint power budgets. |
| Current Sense Threshold | 150mV (max) across RSENSE - sets peak inductor current; allows accurate IMAX scaling via RSENSE = 100mV / IMAX. |
| Off-Time Accuracy | 5µs ±20% (CT = 390pF) - determines minimum operating frequency and dropout behavior; tracks VOUT to stabilize fSW near dropout. |
Pinout & Package
Package: 14-lead narrow SO (SOIC-N14), RoHS-compliant, thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-current gate driver output | Drives P-channel MOSFET source; swing from VIN to GND - requires low-inductance routing to minimize ringing and EMI. |
| NC (Pin 2) | No connection | May be tied to PGND for mechanical stability; no electrical function. |
| VIN (Pin 3) | Main power input | Accepts 3.5V–20V; must be decoupled locally with ≥1µF ceramic + bulk capacitor to suppress switching transients. |
| CT (Pin 4) | Timing capacitor node | External capacitor (e.g., 390pF) sets off-time; discharge current scales with VOUT to stabilize frequency near dropout. |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Supplies internal circuitry; decouple to SGND with 1µF ceramic - do not load externally. |
| ITH (Pin 6) | Gain amplifier compensation node | Connect RC network (e.g., 1kΩ + 3300pF) to set loop bandwidth and phase margin for stable transient response. |
| SENSE– (Pin 7) | Fixed-output feedback reference | Internally connected to 3.3V divider tap - defines regulated output; connect to output rail via low-ESR path. |
| SENSE+ (Pin 8) | Current comparator positive input | Senses voltage across RSENSE; 25–150mV threshold range enables precise peak-current limiting. |
| VFB (Pin 9) | Feedback input (adjustable version only) | No-connect on LTC1148HVCS-3.3#TRPBF - unused in fixed 3.3V configuration. |
| SHUTDOWN (Pin 10) | Logic-enable control | 0V = active; >0.8V = shutdown - CMOS-compatible, requires tR/tF < 1µs; floating state disables device. |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND to COUT(–); prevents noise coupling into feedback and sense paths. |
| PGND (Pin 12) | Power ground return | Connects to N-MOSFET source and CIN(–); high di/dt path - use wide copper pour and star grounding. |
| NC (Pin 13) | No connection | May be tied to PGND; no electrical function. |
| N-DRIVE (Pin 14) | High-current gate driver output | Drives N-channel MOSFET source; swing from GND to VIN - requires matched trace length to P-DRIVE for symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency (>95%) | Enabled by synchronous FET switching and adaptive nonoverlap timing - eliminates body-diode conduction loss in N-MOSFET. |
| Automatic Burst Mode™ operation | Engages below ~300mA load to reduce switching losses, cutting IQ from 2.3mA to 160µA without compromising regulation. |
| Wide input range (3.5V–20V) | Supports direct connection to 12V/19V adapters and automotive batteries with cold-crank tolerance - no external pre-regulator needed. |
| Low dropout (100% duty cycle) | Enables regulation down to VIN – VOUT ≈ 0.2V - critical for Li-ion battery applications where input drops to 3.5V at end-of-discharge. |
| Short-circuit protection | Extends off-time during overload to limit peak inductor current and prevent thermal runaway - self-recovering after fault clears. |
Applications
| Portable Medical Sensors | Industrial Handheld Scanners |
|---|---|
|
Use Scenario: Battery-powered pulse oximeter with Bluetooth LE transmission, operating 24/7 on two AA cells. IC Role / Device Role / Timing Role: Primary 3.3V supply controller for MCU, analog front-end, and RF transceiver - manages dynamic load transitions between sensing (15mA) and BLE burst (120mA). Use Value: Burst Mode™ extends battery life from 3 to >14 days; 160µA standby current minimizes self-discharge during sleep intervals. |
Use Scenario: Ruggedized barcode scanner used in warehouse logistics, powered by removable 7.4V Li-Po pack. IC Role / Device Role / Timing Role: Fixed 3.3V rail generator for image sensor, laser driver, and decode ASIC - handles 0–2A pulsed loads during scan bursts. Use Value: 20V absolute max rating tolerates 16V load-dump transients; synchronous switching sustains >92% efficiency at full 2A load. |
| GPS Tracking Modules | Smart Energy Meters |
|
Use Scenario: Cellular-connected GNSS tracker mounted in vehicle dash, drawing intermittent 500mA GPS fix bursts. IC Role / Device Role / Timing Role: Main 3.3V regulator for GPS SoC and cellular modem - coordinates low-power sleep with fast wake-up (<100µs) for position updates. Use Value: 100% duty-cycle operation maintains regulation as battery sags to 3.5V; low-noise design avoids RF interference with GNSS front-end. |
Use Scenario: DIN-rail mounted electricity meter with isolated RS-485 and PLC communication, powered from 24V AC/DC supply. IC Role / Device Role / Timing Role: Isolated 3.3V auxiliary supply controller for metrology ADC and secure microcontroller - operates continuously under 24/7 mains power. Use Value: 110°C/W SOIC thermal performance enables convection-only cooling; wide VIN range accommodates unregulated 24V input variations. |
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 (2A), 3.4V–42V input, 2.2MHz fixed frequency, higher IQ (2.5µA shutdown) | Eliminates external MOSFETs but lacks Burst Mode™; better for space-constrained designs needing higher fSW | Select when board area is critical and input exceeds 20V; avoid if Burst Mode™ efficiency at µA loads is required. |
| TPS54202DDCR | Integrated 2A FETs, 4.5V–28V input, 500kHz fixed frequency, 2µA shutdown, no Burst Mode™ | Lower BOM cost and layout complexity; lower peak efficiency (~90%) due to integrated FET RDS(ON) | Choose for cost-sensitive industrial controls where 20V max input suffices and 95%+ efficiency at light load is noncritical. |
Compared with LTC1148HVCS-3.3#TRPBF, LT8610ACDE#TRPBF trades external MOSFET flexibility for integration and higher input voltage support, while TPS54202DDCR sacrifices light-load efficiency and programmability for simplified implementation - both require PCB redesign and cannot substitute without verifying loop stability and thermal derating.
Availability
LTC1148HVCS-3.3#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld scanners, GPS tracking modules, and smart energy meters requiring stable component supply across multi-year production cycles.
Supply support for LTC1148HVCS-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, and communications markets.
The LTC1148HV series was engineered for high-efficiency, wide-input synchronous buck control in battery-powered and harsh-environment applications - emphasizing ultralow quiescent current, robust short-circuit handling, and seamless transition between continuous and Burst Mode™ operation.
FAQ
What is the maximum input voltage rating for LTC1148HVCS-3.3#TRPBF?
The LTC1148HVCS-3.3#TRPBF has an absolute maximum input voltage of 20V on the VIN pin, with recommended operating range from 3.5V to 18V. This HV designation distinguishes it from standard LTC1148 variants (16V max), making it suitable for 12V/19V adapter inputs and automotive battery interfaces where load-dump transients may occur. Exceeding 20V risks permanent damage per Absolute Maximum Ratings.
Does LTC1148HVCS-3.3#TRPBF require external feedback resistors to set the 3.3V output?
No - LTC1148HVCS-3.3#TRPBF is a fixed-output variant with internal voltage divider connected to SENSE– (Pin 7) and SENSE+ (Pin 8), eliminating external feedback resistors. This simplifies layout, improves regulation accuracy (±3% over temperature), and removes resistor tolerance and thermal drift errors. Pin 9 (VFB) is NC and must remain unconnected.
How does Burst Mode™ operation improve efficiency at light loads in LTC1148HVCS-3.3#TRPBF?
Burst Mode™ reduces switching activity below ~300mA load, lowering dynamic losses. The LTC1148HVCS-3.3#TRPBF enters sleep mode with both MOSFETs off, cutting input current from 2.3mA (normal mode) to 160µA. Output capacitor supplies load during sleep; regulation resumes when VOUT droops by comparator hysteresis. This yields >85% efficiency at 10mA - unattainable with forced continuous mode.
What is the purpose of the CT pin (Pin 4) on LTC1148HVCS-3.3#TRPBF?
The CT pin sets the off-time duration via an external capacitor (e.g., 390pF), determining operating frequency in continuous mode. Discharge current scales with VOUT, stabilizing fSW near dropout. For LTC1148HVCS-3.3#TRPBF, CT = 390pF yields ~250kHz at VIN = 12V, VOUT = 3.3V. Reducing CT raises frequency (improving transient response) but increases gate charge losses.
Can LTC1148HVCS-3.3#TRPBF drive logic-level MOSFETs at low input voltages?
Yes - the P-DRIVE and N-DRIVE outputs swing rail-to-rail (VIN to GND), enabling reliable turn-on of logic-level MOSFETs (VGS(TH) < 2.5V) even at VIN = 3.5V. This is essential for Li-ion battery applications where input drops below 4V. Standard-threshold MOSFETs (VGS(TH) < 4V) are acceptable above VIN = 8V, but logic-level devices ensure robust gate drive across the full 3.5V–20V range.
LTC1148HVCS-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
LTC1148HVCS-3.3#TRPBF FAQ
1.How can I place an order for LTC1148HVCS-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148HVCS-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 LTC1148HVCS-3.3#TRPBF reliable?
The price and inventory of LTC1148HVCS-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 LTC1148HVCS-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1148HVCS-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148HVCS-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148HVCS-3.3#TRPBF?
LTC1148HVCS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148HVCS-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 LTC1148HVCS-3.3#TRPBF?
For technical support, including LTC1148HVCS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148HVCS-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1148HVCS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1148HVCS-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 LTC1148HVCS-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1148HVCS-3.3#TRPBF?
All LTC1148HVCS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148HVCS-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 LTC1148HVCS-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1148HVCS-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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