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Analog Devices Inc. LTC1148HVCS-5#TRPBF
- Part No.:
- LTC1148HVCS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1148HVCS-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,986
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Product details
Overview
LTC1148HVCS-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous step-down switching regulator controller driving external complementary MOSFETs to deliver regulated 5V output. It features constant off-time current-mode architecture, ultrahigh efficiency (>95% at 1A), 160µA light-load standby current, 3.5V–20V input range, and adaptive nonoverlap gate drives - optimized for battery-powered portable instrumentation requiring stable 5V rail generation.
For engineers reviewing the LTC1148HVCS-5#TRPBF datasheet, LTC1148HVCS-5#TRPBF pinout, LTC1148HVCS-5#TRPBF application, or LTC1148HVCS-5#TRPBF equivalent, key selection criteria include its HV-rated 20V absolute max VIN, 14-pin SOIC package with validated P/N-drive timing control, Burst Mode™ operation down to 0mA load, and compatibility with external RSENSE-programmable current limits.
Technical Context
The LTC1148HVCS-5#TRPBF implements a constant off-time current-mode control architecture where tOFF is set by an external CT capacitor and scaled with VOUT, enabling stable regulation across wide input-output differentials. Its dual comparator structure separates voltage regulation (via internal 1.25V reference and SENSE–/VFB feedback) from peak-current limiting (via 25–170mV sense threshold between SENSE+ and SENSE–).
Burst Mode™ operation is autonomously triggered when output voltage rises above regulation threshold, disabling switching and reducing quiescent current to 160µA; recovery occurs when output drops by comparator hysteresis. Adaptive nonoverlap logic prevents shoot-through by enforcing sequencing: P-DRIVE must be high before N-DRIVE can rise, and N-DRIVE must fall before P-DRIVE can fall.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V (typ) at 700mA load; ±2% tolerance over line/load/temperature ensures stable digital rail without external divider. |
| Input Voltage Range | 3.5V to 20V (absolute max); supports 12V industrial rails and extended automotive battery transients without derating. |
| Efficiency | >95% at 1A (VIN = 10V); achieved via synchronous FET switching and low 160µA sleep-mode IQ, minimizing thermal load in sealed enclosures. |
| Current Sense Threshold | 25mV to 170mV (adjustable via RSENSE); sets peak inductor current and short-circuit limit (e.g., 150mV/RSENSE = ISC(PK)). |
| Off Time (tOFF) | 3.8–6µs (CT = 390pF); determines minimum operating frequency and dropout behavior - scales inversely with VOUT for consistent ripple current. |
| Shutdown Current | <22µA (VIN = 4–18V); enables true zero-power hold during system sleep states while maintaining output capacitor charge. |
| Package | 14-lead narrow SOIC (SO-14); 1.27mm pitch, 8.65mm × 3.9mm footprint compatible with standard reflow and automated optical inspection. |
Pinout & Package
Package: 14-lead plastic SOIC (narrow), JEDEC MS-012AC, θJA = 110°C/W, rated for –40°C to 85°C ambient operation.
| 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 or SGND for mechanical stability; no electrical function. |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and P-DRIVE; must be decoupled within 5mm of PGND with ≥1µF ceramic + bulk electrolytic. |
| CT (Pin 4) | Timing capacitor node | Sets off-time and operating frequency; discharge current proportional to VOUT; requires stable 390pF film/ceramic cap. |
| INTVCC (Pin 5) | Internal 3.3V LDO output | Power source for analog blocks; decouple to SGND with 1µF ceramic; do not load externally. |
| ITH (Pin 6) | Gain amplifier compensation node | External RC network here sets loop bandwidth and phase margin; critical for transient response stability. |
| SENSE– (Pin 7) | Current comparator (–) input / VOUT divider tap | In fixed-5V version, connects internally to output divider; also serves as current-sense reference point. |
| SENSE+ (Pin 8) | Current comparator (+) input | Connects to shunt resistor high side; built-in offset vs. Pin 7 sets programmable current trip threshold. |
| VFB (Pin 9) | Feedback input (adjustable only) | Not connected in LTC1148HVCS-5#TRPBF; NC in fixed-output variants per datasheet pinout diagram. |
| SHUTDOWN (Pin 10) | Logic-controlled enable | Active-low: 0V = normal operation; >0.8V = micropower shutdown; CMOS-compatible, tR/tF < 1µs required. |
| SGND (Pin 11) | Small-signal ground reference | Must be routed separately from PGND to COUT(–); prevents noise coupling into feedback and current sense paths. |
| PGND (Pin 12) | Power ground return | Return path for CIN(–), N-DRIVE sink, and N-MOSFET source; tie directly to PCB power plane under IC. |
| NC (Pin 13) | No connection | May be tied to PGND; no internal connection per SO-14 pin map. |
| N-DRIVE (Pin 14) | High-current gate driver output | Drives N-channel MOSFET drain; swing from GND to VIN; requires symmetric layout vs. P-DRIVE for timing matching. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency >95% | Enabled by synchronous FET switching and Burst Mode™, reducing conduction and switching losses across 0–2A load range. |
| 100% duty cycle dropout operation | Allows regulation down to VIN – VOUT ≈ 0V; P-MOSFET remains fully on when input approaches output, eliminating diode drop. |
| Adaptive nonoverlap gate drive | Hardware-enforced dead time prevents shoot-through; eliminates need for external timing resistors or complex gate drivers. |
| Low 160µA standby current | Reduces battery drain in always-on systems (e.g., GPS trackers); sleep mode draws only 2mW at VIN = 10V, IOUT = 0. |
| Short-circuit protection | Automatic tOFF extension during overload limits average fault current to ~IMAX, preventing thermal runaway without latch-off. |
Applications
| Portable Instrumentation | Battery-Powered Digital Devices |
|---|---|
|
Use Scenario: Handheld multimeter with LCD, microcontroller, and precision ADC powered from single Li-ion cell (3.0–4.2V) stepped up to 5V rail. IC Role / Device Role / Timing Role: Controller for synchronous buck converter generating clean, low-noise 5V supply with minimal heat buildup in compact enclosure. Use Value: Burst Mode™ maintains 92% efficiency at 10mA display backlight load while drawing only 160µA quiescent current, extending battery life beyond 100 hours. |
Use Scenario: Wireless sensor node using BLE SoC and MEMS accelerometer, powered by two AA alkaline cells (1.8–3.2V). IC Role / Device Role / Timing Role: High-efficiency DC-DC controller enabling 5V USB-compliant charging interface and stable logic rail despite varying battery voltage. Use Value: 3.5V–20V input range accommodates boost converter output; 20V abs max rating protects against inductive kickback from motor-driven peripherals. |
| DC Power Distribution Systems | GPS Navigation Units |
|
Use Scenario: Industrial DIN-rail power module distributing 5V/2A to multiple fieldbus nodes from 24V DC bus. IC Role / Device Role / Timing Role: Primary controller for high-reliability buck stage with external MOSFETs rated for continuous 2A output and thermal derating. Use Value: 14-pin SOIC package allows conformal coating and meets IPC-A-610 Class 3 requirements; 160µA sleep current enables remote wake-on-RS485. |
Use Scenario: Automotive-grade portable GPS unit operating across cold-crank (4.5V) to load-dump (18V) conditions. IC Role / Device Role / Timing Role: Input-stage regulator converting vehicle battery to stable 5V for RF front-end, baseband processor, and display backlight. Use Value: 20V absolute maximum VIN withstands ISO 7637-2 pulse 5a; short-circuit protection prevents damage during antenna cable faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1149CS-5#PBF | Supports 48V max VIN; identical pinout and control architecture but higher voltage rating and larger tOFF scaling. | Required for 36V+ input systems (e.g., telecom -48V distribution); not needed for 24V or lower rails. | Select LTC1149CS-5#PBF only if input exceeds 20V; otherwise LTC1148HVCS-5#TRPBF offers better cost and thermal performance at ≤20V. |
| MP2451DT-LF-Z | Integrated 2A MOSFETs; fixed 5V output; 4.5–36V input; no external RSENSE or CT required. | Lower BOM count and layout simplicity, but limited to ≤2A and no programmable current limit or Burst Mode™ optimization. | Choose MP2451DT-LF-Z for space-constrained designs needing plug-and-play operation; LTC1148HVCS-5#TRPBF preferred when >2A, ultra-low IQ, or custom current limiting is required. |
Compared with LTC1149CS-5#PBF, LTC1148HVCS-5#TRPBF delivers superior light-load efficiency and smaller solution size at ≤20V inputs; versus MP2451DT-LF-Z, it trades integration for design flexibility, higher peak current capability, and tighter control over thermal and EMI behavior through discrete FET selection.
Availability
LTC1148HVCS-5#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered digital devices, and DC power distribution systems requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC1148HVCS-5#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 industrial, automotive, communications, and medical markets.
The LTC1148HV series belongs to Linear's legacy high-voltage synchronous buck controller product line, designed specifically for efficiency-critical portable and industrial power conversion where wide input range, ultralow quiescent current, and robust MOSFET gate drive are essential.
FAQ
What is the maximum input voltage rating for LTC1148HVCS-5#TRPBF?
The LTC1148HVCS-5#TRPBF has an absolute maximum input voltage rating of 20V on the VIN pin, with recommended operating range from 3.5V to 18V. This HV designation distinguishes it from standard LTC1148 versions (16V max), making it suitable for 12V and 24V industrial rails. Exceeding 20V risks permanent damage per Absolute Maximum Ratings table.
Does LTC1148HVCS-5#TRPBF require external feedback resistors to set the 5V output?
No - LTC1148HVCS-5#TRPBF is a fixed-output variant with internal resistor divider connected to SENSE– (Pin 7), delivering 5.05V (typ) without external components. Pin 9 (VFB) is unconnected (NC) in this version, unlike adjustable LTC1148 variants which require external resistors to set VOUT.
How does Burst Mode™ operation reduce power consumption in LTC1148HVCS-5#TRPBF?
Burst Mode™ in LTC1148HVCS-5#TRPBF disables switching when output voltage reaches regulation, dropping quiescent current from 2.3mA (normal mode) to 160µA (sleep mode). The device remains in this state until output voltage droops by comparator hysteresis, then resumes regulation - cutting standby power to just 2mW at VIN = 10V, ideal for battery longevity.
Can LTC1148HVCS-5#TRPBF drive both P-channel and N-channel MOSFETs simultaneously?
No - LTC1148HVCS-5#TRPBF uses adaptive nonoverlap gate drive logic that prevents simultaneous conduction: P-DRIVE (Pin 1) must go low before N-DRIVE (Pin 14) can go high, and N-DRIVE must go low before P-DRIVE can rise. This hardware-enforced dead time eliminates shoot-through risk without external timing components.
What is the purpose of the SENSE+ and SENSE– pins on LTC1148HVCS-5#TRPBF?
SENSE+ (Pin 8) and SENSE– (Pin 7) form the differential input to the current comparator, measuring voltage across an external shunt resistor (RSENSE) to detect peak inductor current. In LTC1148HVCS-5#TRPBF, SENSE– is also internally tied to the output voltage divider, enabling fixed 5V regulation while retaining programmable current limiting via RSENSE.
LTC1148HVCS-5#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-5#TRPBF FAQ
1.How can I place an order for LTC1148HVCS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1148HVCS-5#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-5#TRPBF reliable?
The price and inventory of LTC1148HVCS-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1148HVCS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1148HVCS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1148HVCS-5#TRPBF?
LTC1148HVCS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1148HVCS-5#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-5#TRPBF?
For technical support, including LTC1148HVCS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1148HVCS-5#TRPBF requirements.
6.How does Aetrix verify that LTC1148HVCS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1148HVCS-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1148HVCS-5#TRPBF?
All LTC1148HVCS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1148HVCS-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1148HVCS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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