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Analog Devices Inc. LTC1147HVCS8-3.3#TRPBF
- Part No.:
- LTC1147HVCS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1147HVCS8-3.3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,140
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Product details
Overview
LTC1147HVCS8-3.3#TRPBF 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. It delivers a fixed 3.3V output with ±3% regulation over 5mA–2A load, supports 3.5V–16V input, achieves >95% efficiency at full load, and features Burst Mode™ operation for micropower standby (160µA IQ). It is used in portable instrumentation and battery-powered digital systems requiring low-noise, high-density DC/DC conversion.
For engineers reviewing the LTC1147HVCS8-3.3#TRPBF datasheet, LTC1147HVCS8-3.3#TRPBF pinout, LTC1147HVCS8-3.3#TRPBF application, or LTC1147HVCS8-3.3#TRPBF equivalent, key selection criteria include its 3.3V fixed output, 8-pin SO package, 160µA sleep-mode current, 25–150mV current-sense threshold range, and compatibility with logic-level P-MOSFETs for low-VIN operation.
Technical Context
The LTC1147HVCS8-3.3#TRPBF implements a constant off-time current-mode architecture with internal 1.25V reference and built-in gain stage for voltage regulation. Its timing capacitor (CT) pin sets operating frequency, while SENSE+ and SENSE− pins monitor differential voltage across an external sense resistor to control peak inductor current.
Burst Mode™ operation engages below ~300mA load, reducing switching losses by disabling the power stage and lowering quiescent current to 160µA; shutdown mode further reduces IQ to <20µA. The device supports 100% duty cycle for low-dropout operation and includes short-circuit protection via extended off-time during overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.23–3.43V at 700mA), enabling direct replacement of LDOs in noise-sensitive 3.3V logic rails. |
| Input Voltage Range | 3.5V to 16V - supports wide-input battery and industrial supply rails without external regulators. |
| Quiescent Current | 160µA in Burst Mode, enabling >1000-hour runtime on 200mAh Li-ion cells at light loads. |
| Current Sense Threshold | 25mV to 150mV range - allows precise RSENSE selection (e.g., 0.05Ω for 2A max) while maintaining stability across temperature. |
| Off-Time | 3.8–6.5µs (CT = 390pF, ILOAD = 700mA) - determines minimum switching frequency and ripple current scaling. |
| Shutdown Current | <20µA at VSHDN ≥ 0.8V - ensures near-zero power draw during system sleep states. |
| Package | 8-lead SO (S8), 150°C/W θJA - compatible with standard reflow profiles and space-constrained PCB layouts. |
Pinout & Package
8-lead plastic SOIC (S8) package with exposed pad not electrically connected; thermal resistance θJA = 150°C/W. Pin 1 is VIN, Pin 8 is PDRIVE, and Pin 7 is GND - requires separate high-current ground paths for power and signal sections per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 3.5V–16V; must be decoupled with ≥100µF low-ESR capacitor close to pin and 0.1–1µF ceramic for HF filtering. |
| CT (Pin 2) | Timing capacitor connection | Sets off-time and operating frequency; discharge current scales with VOUT to maintain constant ripple current. |
| ITH (Pin 3) | Gain amplifier decoupling | Adjusts current comparator threshold dynamically to track load changes and improve transient response. |
| SENSE− (Pin 4) | Current comparator (−) input & internal voltage divider tap | Connects to output node; forms part of internal 1.25V reference divider and senses current via RSENSE voltage drop. |
| SENSE+ (Pin 5) | Current comparator (+) input | Paired with Pin 4 to detect differential voltage across RSENSE; built-in offset enables accurate current limiting. |
| SHDN/VFB (Pin 6) | Shutdown control / feedback reference | Logic-level input: ≤0.5V = active, ≥0.8V = shutdown; not used as feedback in fixed-output LTC1147HVCS8-3.3#TRPBF. |
| GND (Pin 7) | Power and signal ground return | Two independent ground traces required: one to COUT (−) and one to diode cathode/CIN (−) to minimize noise coupling. |
| PDRIVE (Pin 8) | High-current P-MOSFET gate driver | Swings rail-to-rail (VIN to GND); drives logic-level P-channel devices with fast 100–200ns transitions (CL = 3000pF). |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current-mode control | Delivers stable regulation and excellent line/load transient response without external compensation components. |
| Burst Mode™ operation | Maintains >85% efficiency down to 1mA load by disabling switching and reducing IQ to 160µA. |
| 100% duty cycle capability | Enables dropout operation with VOUT ≈ VIN – ILOAD × RDS(ON), critical for battery end-of-life support. |
| Logic-controlled micropower shutdown | Reduces total system standby power to <2mW at VIN = 10V, meeting stringent energy budget requirements. |
| Short-circuit protection | Extends off-time during overload to limit average short-circuit current to ~IMAX, preventing thermal runaway. |
Applications
| Portable Instrumentation | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Handheld multimeter with dual 3.3V/5V rails powered from two AA cells (2.4–3.2V) plus boost stage. IC Role / Device Role / Timing Role: Step-down controller generating clean 3.3V for microcontroller, ADC, and display interface. Use Value: Burst Mode extends battery life beyond 50 hours; 160µA IQ minimizes self-discharge during idle periods. | Use Scenario: Wireless sensor node using BLE SoC and low-power MCU operating from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary 3.3V supply controller interfacing with external P-MOSFET and Schottky diode. Use Value: Fixed 3.3V output eliminates need for external feedback resistors; 3.5V min VIN enables operation down to battery's 3.3V cutoff. |
| Notebook Subsystem Power | DC Power Distribution Systems |
Use Scenario: Auxiliary 3.3V rail for USB-C PD controller and level-shifting logic in ultrabook docking station. IC Role / Device Role / Timing Role: Secondary buck controller fed from 5V or 12V bus, delivering regulated 3.3V with fast transient response. Use Value: Constant off-time architecture ensures consistent ripple current and predictable EMI behavior under dynamic load steps. | Use Scenario: Industrial IoT gateway with multiple isolated 3.3V domains powered from 12–24V DC bus. IC Role / Device Role / Timing Role: Distributed point-of-load controller managing local 3.3V conversion with fault isolation. Use Value: Short-circuit protection and 16V absolute max VIN tolerate bus transients; SO-8 package simplifies thermal management across modules. |
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#TRPBF | Same architecture and pinout, but rated for 0°C–70°C commercial temp range vs. –40°C–85°C for HV version. | Not suitable for extended-temperature industrial or automotive under-hood use. | Select LTC1147HVCS8-3.3#TRPBF when ambient operation exceeds 70°C or requires guaranteed performance across –40°C to 85°C. |
| TPS54202DRT | Integrated N-MOSFET (not external P-MOS), 4.5–28V input, 3.3V adjustable via resistor divider, no Burst Mode. | Requires external feedback network; higher IQ (120µA typical) but no external MOSFET/diode BOM cost. | Choose TPS54202DRT for simplified design with lower component count where fixed 3.3V and extended temp are not mandatory. |
Compared with LTC1147CS8-3.3#TRPBF, the LTC1147HVCS8-3.3#TRPBF adds guaranteed operation at –40°C and 85°C, making it suitable for harsh environments; versus TPS54202DRT, it offers superior light-load efficiency via Burst Mode and external MOSFET flexibility, albeit with higher design complexity.
Availability
LTC1147HVCS8-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered digital devices, and DC power distribution systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1147HVCS8-3.3#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 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC1147 series was designed as high-efficiency, low-quiescent-current step-down controllers for portable and battery-critical applications, emphasizing Burst Mode™ operation and external P-MOSFET flexibility.
FAQ
What is the maximum input voltage rating for the LTC1147HVCS8-3.3#TRPBF?
The LTC1147HVCS8-3.3#TRPBF has an absolute maximum input voltage rating of 16V on the VIN pin (Pin 1). Operation above 14V is permissible only for brief transients; continuous operation should remain within the recommended 3.5V–14V range to ensure reliability and specified performance across the –40°C to 85°C temperature range.
Does the LTC1147HVCS8-3.3#TRPBF require external feedback resistors to set the output voltage?
No, the LTC1147HVCS8-3.3#TRPBF is a fixed-output variant with internally trimmed 3.3V regulation. Pin 6 (SHDN/VFB) functions solely as a logic-controlled shutdown input and is not connected to an internal feedback divider - eliminating the need for external resistors and reducing BOM count and layout area.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1147HVCS8-3.3#TRPBF?
Burst Mode™ in the LTC1147HVCS8-3.3#TRPBF disables switching and powers the load intermittently from COUT when output current drops below ~300mA. This reduces dynamic losses, cutting quiescent current to 160µA and maintaining >85% efficiency down to 1mA - significantly extending battery life compared to continuous-mode controllers.
Can the LTC1147HVCS8-3.3#TRPBF drive a logic-level P-channel MOSFET?
Yes, the LTC1147HVCS8-3.3#TRPBF's PDRIVE (Pin 8) delivers rail-to-rail swing (VIN to GND) with 100–200ns transition times into 3000pF, fully compatible with logic-level P-MOSFETs (VGS(TH) < 2.5V). This enables efficient operation down to 3.5V input, especially critical for single-cell Li-ion or NiMH battery applications.
What is the purpose of the ITH pin (Pin 3) on the LTC1147HVCS8-3.3#TRPBF?
The ITH pin (Pin 3) on the LTC1147HVCS8-3.3#TRPBF serves as the gain amplifier decoupling point. Its voltage directly modulates the current comparator threshold, allowing dynamic adjustment of peak inductor current to improve load transient response and maintain stable regulation under rapidly changing conditions.
LTC1147HVCS8-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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 ~ 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#TRPBF FAQ
1.How can I place an order for LTC1147HVCS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1147HVCS8-3.3#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 LTC1147HVCS8-3.3#TRPBF reliable?
The price and inventory of LTC1147HVCS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1147HVCS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1147HVCS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1147HVCS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1147HVCS8-3.3#TRPBF?
LTC1147HVCS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1147HVCS8-3.3#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 LTC1147HVCS8-3.3#TRPBF?
For technical support, including LTC1147HVCS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1147HVCS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1147HVCS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1147HVCS8-3.3#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 LTC1147HVCS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1147HVCS8-3.3#TRPBF?
All LTC1147HVCS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1147HVCS8-3.3#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 LTC1147HVCS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1147HVCS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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