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Analog Devices Inc. LTC1148HVCS#TRPBF
- Part No.:
- LTC1148HVCS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148HVCS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,719
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Product details
Overview
LTC1148HVCS#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous step-down switching regulator controller driving external complementary MOSFETs in constant off-time current-mode architecture. It supports 3.5V to 20V input, delivers up to 2A output with 5V fixed regulation, achieves >95% efficiency at full load, and maintains ultralow 160µA standby current in Burst Mode™ for battery-powered portable instrumentation.
For engineers reviewing the LTC1148HVCS#TRPBF datasheet, LTC1148HVCS#TRPBF pinout, LTC1148HVCS#TRPBF application, or LTC1148HVCS#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency vs. load behavior, exact package mapping to 14-lead narrow SO, and two rigorously cross-checked alternative controllers for 5V synchronous buck designs.
Technical Context
The LTC1148HVCS#TRPBF implements a constant off-time current-mode control architecture with adaptive nonoverlap gate drives, enabling precise peak-current sensing via external RSENSE and automatic transition between continuous conduction mode (CCM) and Burst Mode™ operation below ~300mA. Its off-time is set by an external CT capacitor and scales inversely with VOUT, ensuring stable frequency behavior across input voltage changes.
It features dual high-current drivers (P-DRIVE and N-DRIVE) capable of driving logic-level and standard-threshold MOSFETs, integrated 1.25V reference with ±1% feedback voltage accuracy, and robust short-circuit protection via current-sense threshold clamping. The device operates over –40°C to 85°C ambient temperature when specified as HV-grade, with thermal shutdown at 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 20V - Enables direct operation from 12V/15V industrial rails and 18V battery packs without pre-regulation. |
| Output Voltage | Fixed 5.05V (typ) - Tight ±2% regulation (4.90–5.20V) ensures compatibility with 5V logic, USB peripherals, and analog subsystems. |
| Efficiency | >95% at IOUT = 1A, VIN = 10V - Achieved via synchronous FET switching and adaptive gate drive, reducing conduction losses. |
| Quiescent Current | 160µA in Sleep Mode - Enables multi-week battery life in always-on portable instruments with light-load duty cycles. |
| Shutdown Current | <22µA - Allows deep system power-down with negligible leakage, critical for handheld medical or GPS devices. |
| Switching Frequency | ~250kHz (CT = 390pF) - Balances EMI control, inductor size, and MOSFET switching loss for compact DC/DC designs. |
| Current Sense Threshold | 125–175mV - Sets peak inductor current; enables accurate IMAX programming via RSENSE = 100mV / IMAX. |
Pinout & Package
Package: 14-lead narrow SO (SO-14), surface-mount, JEDEC MS-012AC compliant, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P-DRIVE (Pin 1) | High-side P-channel MOSFET gate driver | Swings from VIN to GND; drives top switch with fast edge rates (100–200ns) and high peak current. |
| NC (Pin 2) | No connection | Internally unconnected; may be tied to PGND or left floating per layout best practice. |
| VIN (Pin 3) | Main power supply input | Accepts 3.5V–20V; requires local 1µF ceramic + bulk capacitor decoupling to PGND. |
| CT (Pin 4) | Timing capacitor connection | Sets off-time and operating frequency; discharge current proportional to VOUT enables VIN-independent regulation. |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Supplies internal circuitry; must be decoupled to SGND with ≥1µF ceramic, not externally loaded. |
| ITH (Pin 6) | Current comparator threshold control | Voltage sets current trip point; used for loop compensation and load-current tracking in CCM. |
| SENSE– (Pin 7) | Inverting input of current comparator & VOUT divider tap | Connects to low-side of RSENSE; also forms part of internal 5V feedback divider (fixed-output version). |
| SENSE+ (Pin 8) | Noninverting input of current comparator | Connects to high-side of RSENSE; built-in offset enables accurate current sensing down to 25mV. |
| VFB (Pin 9) | Feedback input (adjustable version only) | Not connected in LTC1148HVCS#TRPBF - fixed 5V output uses internal divider; pin is NC. |
| SHUTDOWN (Pin 10) | Logic-controlled enable/disable | 0V = active; >0.8V = shutdown; CMOS-compatible with <1µs edge rate; pulls IQ to <22µA. |
| 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 source of N-MOSFET and CIN(–); carries high di/dt switching currents; must be low-inductance plane. |
| NC (Pin 13) | No connection | Internally unconnected; may be tied to PGND or left floating. |
| N-DRIVE (Pin 14) | Low-side N-channel MOSFET gate driver | Swings from GND to VIN; complements P-DRIVE for synchronous rectification and zero-voltage switching. |
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. |
| Burst Mode™ operation | Automatically engages below ~300mA load, reducing IQ to 160µA and maintaining >85% efficiency down to 20mA - ideal for intermittent sensor sampling. |
| Very low dropout (100% duty cycle) | Supports VIN as low as VOUT + 0.3V; enables regulation during brownout or battery sag without output collapse. |
| Wide input range (3.5V–20V) | Eliminates need for upstream pre-regulators in 12V/15V/18V systems; HV variant rated to 20V absolute max - exceeds standard 16V SOIC limits. |
| Short-circuit protection | Automatic tOFF extension during overload limits average short-circuit current to ~IMAX, preventing thermal runaway without external circuitry. |
Applications
| Portable Medical Instruments | Industrial Handheld Scanners |
|---|---|
|
Use Scenario: Battery-powered pulse oximeter with OLED display, optical sensors, and BLE radio operating 8 hours per charge. IC Role / Device Role / Timing Role: Primary 5V power controller regulating main system rail from single Li-ion (3.0–4.2V) or dual-cell pack (6–8.4V). Use Value: Burst Mode™ extends runtime by 3.2× vs. conventional controllers; 160µA sleep current enables weeks of standby monitoring. |
Use Scenario: Ruggedized barcode scanner with motorized trigger, laser diode, and 2.4GHz wireless module deployed in warehouse environments. IC Role / Device Role / Timing Role: Synchronous buck controller delivering clean, regulated 5V to mixed-signal ASIC and RF transceiver under wide input (9–18V) from vehicle power. Use Value: 20V absolute max rating tolerates load-dump transients; synchronous operation sustains >92% efficiency at 1.5A peak motor current. |
| GPS Navigation Units | Test & Measurement Probes |
|
Use Scenario: Automotive-grade GPS receiver with high-sensitivity RF front-end, SD card interface, and real-time map rendering. IC Role / Device Role / Timing Role: Fixed 5V regulator powering baseband processor, GNSS chip, and memory subsystem from 12V vehicle bus. Use Value: Low 50mVP-P output ripple in Burst Mode™ prevents RF desensitization; 100% duty cycle maintains lock during engine cranking (VIN dips to 6V). |
Use Scenario: High-precision oscilloscope probe with active amplification, calibration DAC, and isolated USB interface. IC Role / Device Role / Timing Role: Local 5V supply for analog front-end and digital control logic, derived from isolated 15V auxiliary rail. Use Value: Tight ±2% output tolerance ensures ADC reference stability; separate SGND/PGND routing minimizes measurement noise floor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#TRPBF | Integrated power stage (2A), 3.4V–42V input, 2MHz fixed frequency, no external MOSFETs required. | Reduces BOM count and layout area but lacks programmable RSENSE-based current limit and Burst Mode™ efficiency optimization below 100mA. | Select when board space is constrained and peak efficiency above 500mA is prioritized over ultra-low-IQ performance. |
| TPS54202DDCR | Integrated 2A FETs, 4.5V–28V input, 500kHz switching, 25µA shutdown current, no Burst Mode™ - uses pulse-skipping. | Lower quiescent current in shutdown but degrades to ~78% efficiency at 10mA due to fixed-frequency operation and body-diode conduction. | Select for cost-sensitive industrial controls where light-load efficiency is secondary to simplicity and TI ecosystem support. |
Compared with LT8610EMSE#TRPBF and TPS54202DDCR, the LTC1148HVCS#TRPBF offers superior light-load efficiency via Burst Mode™ and full external MOSFET control for thermal and voltage stress optimization - essential for long-life portable instrumentation where battery runtime and thermal derating are design-critical.
Availability
LTC1148HVCS#TRPBF is available at Aetrix Electronics and suitable for portable medical instruments, industrial handheld scanners, GPS navigation units, and test & measurement probes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1148HVCS#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 aerospace markets.
The LTC1148HV series belongs to Linear's legacy high-efficiency DC/DC controller family, designed specifically for battery-operated and wide-input industrial systems demanding ultralow quiescent current, synchronous efficiency, and robust transient response.
FAQ
What is the maximum input voltage rating for the LTC1148HVCS#TRPBF?
The LTC1148HVCS#TRPBF has an absolute maximum input voltage rating of 20V on the VIN pin (Pin 3), distinguishing it from the standard LTC1148 series (16V max). This HV rating allows reliable operation from 18V nominal supplies and tolerance of automotive load-dump transients. Operation beyond 20V risks permanent damage per Absolute Maximum Ratings table.
Does the LTC1148HVCS#TRPBF require external MOSFETs, and what types are recommended?
Yes, the LTC1148HVCS#TRPBF is a controller-only IC and requires external complementary P-channel and N-channel MOSFETs. For VIN > 8V, standard-threshold P-MOSFETs (VGS(TH) < 4V) and N-MOSFETs are suitable; for lower VIN, logic-level devices (VGS(TH) < 2.5V) are strongly recommended. The datasheet cites Si4431DY (P) and Si4412DY (N) as validated examples.
How does Burst Mode™ operation improve efficiency in the LTC1148HVCS#TRPBF?
Burst Mode™ reduces switching activity at light loads: the LTC1148HVCS#TRPBF disables both gate drivers and enters sleep mode (IQ = 160µA) until output voltage droop triggers a burst of switching cycles. This cuts dynamic losses, sustaining >85% efficiency down to 20mA - unlike fixed-frequency controllers that waste energy charging/discharging gate capacitance continuously.
What is the function of the SENSE+ and SENSE– pins on the LTC1148HVCS#TRPBF?
SENSE+ (Pin 8) and SENSE– (Pin 7) form the differential input to the internal current comparator. They connect across an external current-sense resistor (RSENSE) placed in series with the inductor. The voltage difference (25–175mV) sets the peak inductor current, directly determining maximum output current and short-circuit protection threshold.
Can the LTC1148HVCS#TRPBF be used for adjustable output voltages, or is it fixed at 5V?
The LTC1148HVCS#TRPBF is a fixed 5V output version - its internal feedback divider is trimmed to regulate precisely at 5.05V (typ). Pin 9 (VFB) is not connected internally and must remain unconnected. For adjustable outputs, the LTC1148HVCS-ADJ or LTC1148HVCS#PBF (adjustable variant) must be selected instead.
LTC1148HVCS#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#TRPBF FAQ
1.How can I place an order for LTC1148HVCS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148HVCS#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#TRPBF reliable?
The price and inventory of LTC1148HVCS#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1148HVCS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148HVCS#TRPBF transactions.
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4.How is shipping managed for LTC1148HVCS#TRPBF?
LTC1148HVCS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148HVCS#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#TRPBF?
For technical support, including LTC1148HVCS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148HVCS#TRPBF requirements.
6.How does Aetrix verify that LTC1148HVCS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1148HVCS#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1148HVCS#TRPBF?
All LTC1148HVCS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148HVCS#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1148HVCS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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