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Analog Devices Inc. LTC1147CN8-5#PBF
- Part No.:
- LTC1147CN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1147CN8-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,334
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Product details
Overview
LTC1147CN8-5#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 5V at up to 2A output. It operates from 3.5V to 16V input, achieves >95% efficiency at full load, maintains regulation down to 100% duty cycle, and features automatic Burst Mode™ operation for ultra-low 160µA standby current. It is used in battery-powered portable instruments requiring stable 5V rail generation with minimal board space.
For engineers reviewing the LTC1147CN8-5#PBF datasheet, LTC1147CN8-5#PBF pinout, LTC1147CN8-5#PBF application, or LTC1147CN8-5#PBF equivalent, key selection criteria include its fixed 5V output, 8-pin PDIP package, 150mV current sense threshold, 5µs typical off-time, and compatibility with standard-threshold P-MOSFETs - all critical for low-voltage, high-efficiency DC/DC designs.
Technical Context
The LTC1147CN8-5#PBF implements a constant off-time current-mode architecture where the timing capacitor (CT) on Pin 2 sets switching frequency, and the voltage across RSENSE between SENSE+ (Pin 5) and SENSE– (Pin 4) triggers MOSFET turn-off. Its internal 1.25V reference compares against a resistive divider from VOUT to set regulation point.
Burst Mode™ operation engages below ~300mA load, reducing quiescent current to 160µA by disabling switching until output droop exceeds hysteresis; shutdown via SHDN (Pin 6) draws <20µA. The PDRIVE (Pin 8) output swings rail-to-rail (VIN to GND) to drive P-MOSFET gates with 100–200ns transition times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V nominal (4.90–5.20V over load/temp), enabling direct 5V rail generation without feedback resistors. |
| Input Voltage Range | 3.5V to 16V max - supports wide-input industrial/battery systems including 5V, 9V, and 12V sources. |
| Current Sense Threshold | 125–185mV (typ. 150mV) between SENSE+ and SENSE– - sets peak inductor current and maximum 2A output capability with 0.05Ω RSENSE. |
| Off-Time | 3.8–6.5µs (typ. 5µs) - determines minimum on-time and dropout behavior; scales with VOUT to maintain stable frequency vs. VIN. |
| Quiescent Current | 160–260µA in Sleep Mode - enables multi-day battery life in always-on portable devices at light loads. |
| Shutdown Current | 10–22µA - ensures near-zero power drain during system sleep states. |
| Package | 8-lead plastic DIP (N8) - through-hole mounting compatible with legacy PCB assembly and prototyping. |
Pinout & Package
Package: 8-lead plastic DIP (N8), θJA = 110°C/W, operating ambient range 0°C to 70°C (Commercial grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power supply input | Accepts 3.5V–16V; requires local 100µF + 0.1µF ceramic decoupling to minimize noise and transient spikes. |
| CT (Pin 2) | Timing capacitor connection | Sets switching frequency via external capacitor (e.g., 390pF → ~500kHz); discharge current scales with VOUT for stable off-time. |
| ITH (Pin 3) | Gain amplifier decoupling | Stabilizes current comparator threshold; connect 0.1µF ceramic to GND to suppress noise-induced false triggering. |
| SENSE– (Pin 4) | Current sense (–) input / internal voltage divider tap | Connects to VOUT via internal resistor; also serves as (–) input of current comparator - defines regulation setpoint and current trip reference. |
| SENSE+ (Pin 5) | Current sense (+) input | Connects to shunt resistor high-side; 150mV offset vs. Pin 4 sets current limit - enables accurate peak-current control independent of MOSFET RDS(ON). |
| SHDN/VFB (Pin 6) | Shutdown control / fixed-output enable | Logic-level input: <0.8V = normal operation, >2V = micropower shutdown (<20µA); not used as feedback in fixed-5V version. |
| GND (Pin 7) | Analog and power ground | Must be split: one path to COUT(–), another to diode cathode/CIN(–) - prevents ground bounce from disrupting current sensing. |
| PDRIVE (Pin 8) | P-channel MOSFET gate driver | High-current push-pull output (VIN to GND swing); drives gate capacitance directly - eliminates need for external driver stage. |
Key Features
| Feature | Design Value |
|---|---|
| Constant off-time current mode | Enables stable regulation across wide input/output differentials and eliminates need for loop compensation components. |
| Automatic Burst Mode™ operation | Reduces standby power to 2mW at VIN=10V, extending battery runtime without manual mode switching. |
| 100% duty cycle capability | Supports ultra-low dropout operation (VOUT ≈ VIN) when input approaches output - critical for single-cell Li-ion or 5V bus hold-up. |
| Integrated 1.25V reference | Provides precise, temperature-stable feedback reference - eliminates external voltage reference IC and associated error budget. |
| Short-circuit protection | Extends off-time during overload to limit average short-circuit current to ~IMAX, preventing thermal runaway without external circuitry. |
Applications
| Portable Medical Instruments | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Handheld blood glucose meters and portable ECG monitors powered by two AA alkaline cells (2.4–3.2V) stepped up to 5V for analog front-end and microcontroller. IC Role / Device Role / Timing Role: LTC1147CN8-5#PBF acts as primary 5V DC/DC controller, regulating output despite falling battery voltage and load transients from sensor sampling. Use Value: Burst Mode™ extends battery life beyond 100 hours per set; 160µA sleep current minimizes self-discharge during idle periods between measurements. | Use Scenario: Field-deployable multimeters and oscilloscope probes requiring isolated 5V rails from 9V PP3 batteries. IC Role / Device Role / Timing Role: LTC1147CN8-5#PBF controls external Si4431DY P-MOSFET to generate clean, regulated 5V for precision ADCs and digital logic under variable load. Use Value: Fixed 5V output eliminates feedback resistor tolerance errors; 150mV current sense threshold enables accurate 2A current limiting for fault-tolerant design. |
| Industrial Data Loggers | GPS Tracking Modules |
Use Scenario: Remote environmental sensors logging temperature/humidity using LoRaWAN, powered by 3.6V Li-SOCl₂ primary cells with 10-year shelf life. IC Role / Device Role / Timing Role: LTC1147CN8-5#PBF supplies 5V to MCU and radio only during active transmission bursts, entering deep sleep between intervals. Use Value: <20µA shutdown current preserves battery capacity over decade-long deployments; 100% duty cycle sustains 5V output even as cell voltage drops to 3.5V. | Use Scenario: Compact vehicle-mounted GPS receivers operating from 12V automotive bus with cold-crank immunity down to 6V. IC Role / Device Role / Timing Role: LTC1147CN8-5#PBF regulates 5V for GPS baseband IC and RF frontend, rejecting input ripple and maintaining lock during engine cranking. Use Value: Wide 3.5–16V input range accommodates 12V transients and brownouts; constant off-time architecture ensures stable frequency during rapid VIN changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1147CS8-5#PBF | Same electrical specs, but in 8-lead SOIC (S8) package - surface-mount, θJA = 150°C/W, same 0°C to 70°C temp grade. | Requires rework of PCB layout for SMT assembly; better thermal performance in dense layouts but no pinout change. | Select LTC1147CS8-5#PBF for automated production; retain LTC1147CN8-5#PBF for through-hole prototyping or legacy board repair. |
| LTC1147IS8-5#PBF | Identical functionality and pinout, but rated for –40°C to 85°C industrial temperature range and SOIC package. | Required for extended-temperature environments (e.g., automotive under-hood, outdoor infrastructure) where commercial-grade N8 fails. | Choose LTC1147IS8-5#PBF when operating ambient exceeds 70°C or reliability across temperature extremes is mandatory. |
Compared with LTC1147CS8-5#PBF and LTC1147IS8-5#PBF, the LTC1147CN8-5#PBF offers identical regulation accuracy and efficiency but provides through-hole mechanical robustness and simplified hand-soldering - making it optimal for lab validation, field service, and low-volume industrial control units where thermal margin is sufficient.
Availability
LTC1147CN8-5#PBF is available at Aetrix Electronics and suitable for portable medical instruments, battery-powered test equipment, industrial data loggers, GPS tracking modules, and handheld instrumentation requiring stable component supply with long-term manufacturability.
Supply support for LTC1147CN8-5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1147 series belongs to Linear's legacy high-efficiency DC/DC controller product line, designed specifically for compact, low-quiescent-current step-down conversion in battery-critical portable and industrial systems.
FAQ
What is the regulated output voltage of the LTC1147CN8-5#PBF?
The LTC1147CN8-5#PBF delivers a fixed 5.05V nominal output voltage, with guaranteed range of 4.90V to 5.20V across load (5mA–2A) and temperature (0°C–70°C). This is achieved via internal resistor divider and 1.25V reference - no external feedback resistors required.
Does the LTC1147CN8-5#PBF require an external MOSFET, and what type is recommended?
Yes, the LTC1147CN8-5#PBF requires an external P-channel power MOSFET. For input voltages above 8V, a standard-threshold device (VGS(TH) < 4V) such as the Si4431DY is recommended; for inputs down to 3.5V, a logic-level P-MOSFET (VGS(TH) < 2.5V) is strongly advised to ensure full enhancement.
How does Burst Mode™ operation improve efficiency in the LTC1147CN8-5#PBF?
Burst Mode™ reduces switching activity below ~300mA load, lowering quiescent current to 160–260µA and cutting standby power to just 2mW at VIN=10V. This extends battery life significantly in intermittent-use applications like data loggers and handheld testers without compromising regulation accuracy.
What is the function of Pin 6 (SHDN/VFB) on the LTC1147CN8-5#PBF?
On the LTC1147CN8-5#PBF, Pin 6 functions solely as a logic-controlled shutdown input: grounding it enables normal operation; pulling it >2V places the device in micropower shutdown (<20µA). It is not used as a feedback pin - that role applies only to the adjustable LTC1147L variants.
Can the LTC1147CN8-5#PBF operate with 100% duty cycle, and under what conditions?
Yes, the LTC1147CN8-5#PBF supports 100% duty cycle operation when VIN approaches VOUT, enabling ultra-low dropout regulation. This occurs automatically as the input voltage drops near 5V - the P-channel MOSFET remains continuously on, delivering VOUT ≈ VIN – ILOAD × RDS(ON) – ILOAD × RSENSE.
LTC1147CN8-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1147CN8-5#PBF FAQ
1.How can I place an order for LTC1147CN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1147CN8-5#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 LTC1147CN8-5#PBF reliable?
The price and inventory of LTC1147CN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1147CN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1147CN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1147CN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1147CN8-5#PBF?
LTC1147CN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1147CN8-5#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 LTC1147CN8-5#PBF?
For technical support, including LTC1147CN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1147CN8-5#PBF requirements.
6.How does Aetrix verify that LTC1147CN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1147CN8-5#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 LTC1147CN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1147CN8-5#PBF?
All LTC1147CN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1147CN8-5#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 LTC1147CN8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1147CN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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