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Analog Devices Inc. LTC1147HVCS8-3.3#PBF
- Part No.:
- LTC1147HVCS8-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1147HVCS8-3.3#PBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,752
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Product details
Overview
LTC1147HVCS8-3.3#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, constant off-time current-mode step-down switching regulator controller driving an external P-channel MOSFET to deliver a regulated 3.3V output. It operates from 3.5V to 16V input, supports up to 2A load current with ≤65mV load regulation, and achieves >95% efficiency at mid-load with Burst Mode™ operation for ultra-low quiescent current (160µA in sleep mode). It is used in portable instrumentation and battery-powered digital systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LTC1147HVCS8-3.3#PBF datasheet, LTC1147HVCS8-3.3#PBF pinout, LTC1147HVCS8-3.3#PBF application, or LTC1147HVCS8-3.3#PBF equivalent, key selection criteria include its 3.3V fixed output, 8-pin SO package, 125mV current sense threshold range, 5µs typical off-time, and compatibility with external P-channel MOSFETs such as Si4431DY for low-RDS(ON) operation.
Technical Context
The LTC1147HVCS8-3.3#PBF implements a constant off-time current-mode architecture with internal 1.25V reference and built-in gain amplifier, enabling fast line/load transient response and stable regulation across wide input (3.5V–16V) and output current (0–2A) ranges. Its SENSE+ and SENSE− pins monitor differential voltage across an external sense resistor to control peak inductor current.
Burst Mode™ operation automatically engages below ~300mA load, reducing switching losses and holding quiescent current at 160µA while maintaining regulation via output capacitor discharge. The SHDN pin provides logic-controlled micropower shutdown (<20µA), and PDRIVE delivers high-current gate drive (VIN-to-GND swing) compatible with standard- and logic-level P-MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.23V–3.43V at 700mA load); enables direct replacement of LDOs in noise-sensitive 3.3V logic rails. |
| Input Voltage Range | 3.5V to 16V (absolute max 16V); supports wide-input industrial and automotive battery-derived supplies. |
| Current Sense Threshold | 25mV to 150mV (typ. 125mV); sets peak inductor current via external RSENSE, enabling precise IMAX tuning (e.g., 0.05Ω → ~2.5A peak). |
| Off-Time | 3.8µs to 6.5µs (typ. 5µs at CT=390pF); determines minimum on-time and dropout behavior-enables 100% duty cycle for ultra-low dropout operation. |
| Quiescent Current | 160µA (sleep mode), <20µA (shutdown); reduces standby power to ~2mW at VIN=10V, critical for battery life in always-on devices. |
| Efficiency | >95% at 1A load (VIN=6V→3.3V); achieved via low-loss current-mode control, minimal gate drive loss, and optimized Burst Mode timing. |
| Package | 8-lead SO (S8); RoHS-compliant, surface-mountable, θJA=150°C/W, suitable for compact PCB layouts. |
Pinout & Package
Package: 8-lead plastic SO (S8), 150°C/W junction-to-ambient thermal resistance, RoHS-compliant lead finish (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main supply input | Accepts 3.5V–16V; requires local 100µF + 0.1µF ceramic decoupling to minimize switching noise injection. |
| CT (Pin 2) | Timing capacitor connection | Sets operating frequency via external capacitor (e.g., 390pF → ~400kHz); discharge current scales with VOUT for stable off-time. |
| ITH (Pin 3) | Gain amplifier decoupling | Stabilizes current comparator threshold; connect 100nF ceramic to GND to suppress high-frequency oscillation. |
| SENSE− (Pin 4) | Current sense reference / feedback divider tap | Internal resistive divider node; connects to output rail to set 3.3V regulation; also (−) input of current comparator. |
| SENSE+ (Pin 5) | Current sense input | (+) input of current comparator; senses voltage across external RSENSE to limit peak inductor current. |
| SHDN/VFB (Pin 6) | Shutdown control / feedback reference | Logic-level input: <0.8V = normal operation, >2V = shutdown (<20µA IQ); not used as feedback in fixed-output variants. |
| GND (Pin 7) | Analog and power ground | Must be split: one path to COUT(−), second to Schottky cathode/CIN(−) to prevent ground bounce and EMI. |
| PDRIVE (Pin 8) | High-current P-MOSFET gate driver | Swings from VIN to GND; drives gate capacitance directly-requires low-inductance layout and no series resistor for Si4431DY. |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current-mode control | Delivers stable regulation and excellent transient response without external compensation; inherently limits peak current and simplifies loop design. |
| Burst Mode™ operation | Reduces switching losses at light loads, maintaining >85% efficiency down to 1mA while holding IQ at 160µA-critical for battery runtime. |
| 100% duty cycle capability | Enables ultra-low dropout operation (VOUT ≈ VIN) when input approaches output, eliminating need for separate LDO post-regulation. |
| Logic-compatible shutdown | CMOS-level SHDN pin (0.5–2V threshold) allows direct interface with microcontrollers or PMICs without level-shifting circuitry. |
| Short-circuit protection | Automatically extends off-time during overload, limiting average short-circuit current to ~IMAX and preventing thermal runaway. |
Applications
| Portable Medical Instrumentation | Industrial Handheld Scanners |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring stable 3.3V for ADCs, microcontrollers, and OLED displays over 0–40°C ambient. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating Li-ion (3.0–4.2V) or alkaline (4.5–6.0V) battery input to clean 3.3V rail. Use Value: Burst Mode™ extends battery life beyond 12 months on two AA cells; 160µA sleep current minimizes self-discharge during standby. |
Use Scenario: Ruggedized barcode scanners powered by 7.2V NiMH packs, operating in warehouses with frequent start-stop cycles and temperature swings. IC Role / Device Role / Timing Role: High-efficiency buck controller supplying 3.3V to ARM Cortex-M4 MCU and CMOS image sensor with fast load-step response. Use Value: Constant off-time architecture ensures <5µs recovery from 100mA→1A load steps; 125°C junction rating supports sealed enclosure operation. |
| GPS Navigation Receivers | Low-Power IoT Sensor Nodes |
Use Scenario: Automotive-grade GPS modules needing low-noise 3.3V for RF front-end and baseband ICs, operating from 9–16V vehicle supply with cold-crank immunity. IC Role / Device Role / Timing Role: Input-stage buck controller stepping 12V nominal to 3.3V, preceding LDO filtering for RF section. Use Value: Wide 3.5–16V input range tolerates 6V cold-crank dips; 100% duty cycle maintains regulation during engine cranking transients. |
Use Scenario: Wireless environmental sensors (temperature/humidity) deployed in remote locations, powered by single Li-SOCl₂ cell (3.6V) with 10-year target lifetime. IC Role / Device Role / Timing Role: Primary power controller delivering regulated 3.3V to ultra-low-power MCU and BLE radio during brief active bursts. Use Value: 20µA shutdown current prevents battery drain during 99.9% sleep time; integrated Burst Mode eliminates need for external enable sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1147CS8-3.3 | Same architecture and pinout, but rated for 0°C to 70°C (commercial temp) vs. –40°C to 85°C (industrial) for LTC1147HVCS8-3.3#PBF. | Suitable for indoor consumer electronics; not qualified for extended-temperature industrial or automotive use. | Select LTC1147HVCS8-3.3#PBF for designs requiring guaranteed operation at –40°C or 85°C ambient. |
| LT3502AEDD-3.3#PBF | Monolithic 3.3V buck regulator (integrated MOSFETs), 3.3V/600mA output, 2.7–25V input, no external P-MOS required. | Lower BOM count and board area, but limited to 600mA and lacks 100% duty cycle or Burst Mode efficiency at ultra-light loads. | Choose LT3502AEDD-3.3#PBF only if output current ≤600mA and integration outweighs efficiency/thermal flexibility needs. |
Compared with LTC1147CS8-3.3, the LTC1147HVCS8-3.3#PBF offers extended temperature qualification and higher reliability margin; compared with LT3502AEDD-3.3#PBF, it delivers higher output current, superior light-load efficiency, and full dropout control-but requires external MOSFET and layout attention.
Availability
LTC1147HVCS8-3.3#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial handheld scanners, and GPS navigation receivers requiring stable component supply with long-term industrial temperature support.
Supply support for LTC1147HVCS8-3.3#PBF 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1147 series was designed as high-efficiency, externally switched buck controllers targeting battery-powered and wide-input industrial systems where thermal headroom, light-load efficiency, and dropout performance are critical.
FAQ
What is the maximum continuous output current supported by the LTC1147HVCS8-3.3#PBF?
The LTC1147HVCS8-3.3#PBF itself does not source output current-it controls an external P-channel MOSFET. With appropriate external components (e.g., Si4431DY, 50µH inductor, 0.05Ω sense resistor), the LTC1147HVCS8-3.3#PBF-based converter reliably delivers 2A continuous output current while maintaining regulation and thermal safety under 85°C ambient conditions.
Does the LTC1147HVCS8-3.3#PBF require external compensation components?
No, the LTC1147HVCS8-3.3#PBF uses constant off-time current-mode control and does not require external loop compensation. Stability is inherent to the architecture-only the CT capacitor (e.g., 390pF), ITH bypass capacitor (100nF), and proper PCB grounding are needed for reliable operation per the recommended layout in the datasheet.
Can the LTC1147HVCS8-3.3#PBF operate with a 3.0V input supply?
No-the absolute minimum input voltage for the LTC1147HVCS8-3.3#PBF is 3.5V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3.5V may result in regulation loss, erratic Burst Mode behavior, or failure to initiate switching. For sub-3.5V inputs, consider the LTC1147L variant or alternative architectures.
How does the SHDN pin function on the LTC1147HVCS8-3.3#PBF?
On the LTC1147HVCS8-3.3#PBF, Pin 6 (SHDN/VFB) serves exclusively as a logic-controlled shutdown input. Pulling it below 0.5V enables normal operation; pulling it above 2.0V places the LTC1147HVCS8-3.3#PBF into micropower shutdown (<20µA IQ). It is not used for feedback-unlike the adjustable LTC1147L variants-and must never be left floating.
What is the purpose of the ITH pin (Pin 3) on the LTC1147HVCS8-3.3#PBF?
The ITH pin (Pin 3) on the LTC1147HVCS8-3.3#PBF is the gain amplifier decoupling point. It sets the current comparator threshold voltage in proportion to its voltage level. A 100nF ceramic capacitor from ITH to GND stabilizes the gain stage, suppresses high-frequency noise coupling into the current sense path, and prevents false triggering during fast load transients.
LTC1147HVCS8-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 ~ 14V
- Frequency - Switching:
- -
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- 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:
- 8-SO
LTC1147HVCS8-3.3#PBF FAQ
1.How can I place an order for LTC1147HVCS8-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1147HVCS8-3.3#PBF 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 LTC1147HVCS8-3.3#PBF reliable?
The price and inventory of LTC1147HVCS8-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1147HVCS8-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC1147HVCS8-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1147HVCS8-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1147HVCS8-3.3#PBF?
LTC1147HVCS8-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1147HVCS8-3.3#PBF 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 LTC1147HVCS8-3.3#PBF?
For technical support, including LTC1147HVCS8-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1147HVCS8-3.3#PBF requirements.
6.How does Aetrix verify that LTC1147HVCS8-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1147HVCS8-3.3#PBF 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 LTC1147HVCS8-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC1147HVCS8-3.3#PBF?
All LTC1147HVCS8-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1147HVCS8-3.3#PBF, 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 LTC1147HVCS8-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC1147HVCS8-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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