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Analog Devices Inc. LTC1682IMS8#TRPBF
- Part No.:
- LTC1682IMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1682IMS8#TRPBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,804
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Product details
Overview
LTC1682IMS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, low-noise dual-stage power management IC combining a 550kHz switched-capacitor voltage doubler charge pump and an integrated low-dropout linear regulator. It delivers up to 50mA regulated output with 64µVRMS noise (10Hz–100kHz), fixed 3.3V output, 1.8V–4.4V input range, and operates in industrial temperature range (–40°C to +85°C). It powers noise-sensitive RF blocks such as VCOs in cellular handsets.
For engineers reviewing the LTC1682IMS8#TRPBF datasheet, LTC1682IMS8#TRPBF pinout, LTC1682IMS8#TRPBF application, or LTC1682IMS8#TRPBF equivalent, key selection criteria include its ultra-low output noise, absence of inductors, compatibility with ceramic capacitors only, thermal/short-circuit protection, and MSOP-8 packaging for space-constrained RF power rails.
Technical Context
The LTC1682IMS8#TRPBF implements a two-stage architecture: first, a precision 550kHz charge pump doubles VIN to generate CPO (~2×VIN); second, an internal LDO filters CPO ripple and regulates to a stable 3.3V output. The LDO features 75mV typical dropout at 10mA and remains stable with only 2µF output capacitance.
Operation includes Burst Mode for efficiency below 100µA load, automatic LDO enable/disable based on CPO voltage thresholds (1.75×VIN enable, 1.45×VIN disable), and shutdown mode reducing supply current to <5µA while discharging VOUT via a 100Ω switch to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over full industrial temperature range and 1mA–10mA load |
| Output Noise | 64µVRMS (10Hz–100kHz), enabling clean biasing of high-frequency VCOs without added filtering |
| Input Voltage Range | 1.8V to 4.4V - supports single-cell Li-ion, NiMH, and 3.3V system rails |
| Max Output Current | 50mA continuous - sufficient for RF synthesizers, PLLs, and low-power analog front-ends |
| Operating Current | 150µA typical (no load, burst mode) - enables multi-day battery life in portable wireless devices |
| Shutdown Current | 1µA maximum - ensures negligible standby drain in always-on communication modules |
| Switching Frequency | 550kHz ±70kHz - high enough to allow small 0.22µF flying capacitor and avoid AM band interference |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), thermally enhanced for industrial ambient operation. Pin 4 (GND) serves as primary thermal path; recommended PCB layout uses large copper pour under exposed pad (if present) and all ground pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | 3.3V low-noise supply rail; requires ≥2µF low-ESR ceramic capacitor directly at pin for stability and noise suppression |
| SHDN (Pin 2) | Active-low enable control | Pull ≤0.4V to enter shutdown (<5µA IIN, VOUT discharged to GND); tie to VIN for always-on operation |
| FILT (Pin 3) | Reference filter node | Connect 1nF capacitor to GND to minimize reference noise and achieve specified 64µVRMS output noise |
| GND (Pin 4) | Power and signal reference | Main thermal and current return path; must be low-impedance connection to system ground plane |
| C– (Pin 5) | Flying capacitor negative terminal | Completes charge transfer cycle with C+; requires 0.22µF ceramic capacitor rated ≥6.3V |
| VIN (Pin 6) | Main input supply | 1.8V–4.4V input; bypass with ≥2µF low-ESR ceramic capacitor close to pin to suppress switching transients |
| C+ (Pin 7) | Flying capacitor positive terminal | Alternates polarity with C– during charge pump operation; same capacitor connects C+ and C– |
| CPO (Pin 8) | Unregulated charge pump output | ~6.6V at VIN=3.3V; supplies LDO stage; bypass with ≥2µF low-ESR ceramic capacitor to reduce ripple feeding LDO |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates EMI-prone magnetics and simplifies layout-only four external ceramic capacitors required |
| Integrated thermal & short-circuit protection | Auto-shutdown at >150°C junction; recovers at <140°C; indefinite VOUT short-to-ground tolerance |
| Low-noise LDO regulation | 64µVRMS noise enables direct powering of VCOs without post-regulation filtering or ferrite beads |
| Burst Mode efficiency optimization | Reduces quiescent current to 150µA at light loads while maintaining regulation-critical for sleep-mode battery life |
| Industrial temperature grade | Specified performance from –40°C to +85°C ensures reliability in automotive infotainment, industrial telemetry, and outdoor IoT nodes |
Applications
| Cellular Handset VCO Supply | Wireless PCMCIA Card Power |
|---|---|
Use Scenario: Providing clean 3.3V bias to voltage-controlled oscillators in GSM/UMTS handset transceivers. IC Role / Device Role / Timing Role: Primary low-noise regulated supply for RF frequency synthesis block. Use Value: 64µVRMS noise prevents phase noise degradation in 900MHz/1.8GHz VCOs, preserving EVM and adjacent channel leakage ratio. |
Use Scenario: Generating stable 3.3V rail for IEEE 802.11b WLAN baseband and RF ICs in laptop expansion cards. IC Role / Device Role / Timing Role: Compact, inductorless boost-LDO power source replacing discrete solutions. Use Value: MSOP-8 footprint and ceramic-only BOM reduce PCB area by >40% versus inductor-based alternatives while meeting spectral mask requirements. |
| Portable Medical Instrument Sensor Bias | Remote Wireless Transmitter Power |
Use Scenario: Supplying ultra-low-noise 3.3V to precision analog front-ends in handheld ECG or pulse oximetry sensors. IC Role / Device Role / Timing Role: Low-drift, low-ripple power source for ADC reference and op-amp biasing. Use Value: 50mA capability and <50ppm/°C output drift ensure accurate sensor signal conditioning across clinical operating temperatures. |
Use Scenario: Powering sub-GHz ISM band transmitters (e.g., 433MHz, 868MHz) in battery-operated telemetry nodes. IC Role / Device Role / Timing Role: Efficient, regulated boost converter enabling multi-year operation on coin cells. Use Value: 1µA shutdown current and 150µA operating current extend CR2032 battery life beyond 3 years in periodic transmit applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise boosted supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1682CMS8-3.3 | Commercial temperature grade (0°C to 70°C); identical electrical specs and pinout | Suitable for consumer-grade portable electronics but not industrial/automotive environments | Select when operating ambient stays within 0–70°C and cost sensitivity outweighs extended temp qualification |
| LT3467EDD-3.3 | Inductor-based 1.3MHz boost converter; higher 200µVRMS noise; requires external inductor and diode | Better efficiency above 30mA; less suitable for VCOs due to higher switching noise and EMI | Prefer for non-RF applications needing >50mA or higher conversion efficiency where board area allows inductor placement |
Compared with LTC1682CMS8-3.3, the LTC1682IMS8#TRPBF provides guaranteed performance over –40°C to +85°C without derating, making it essential for automotive or outdoor deployments; versus LT3467EDD-3.3, it trades slightly lower efficiency for dramatically lower noise and inductor-free design-critical for RF signal integrity.
Availability
LTC1682IMS8#TRPBF is available at Aetrix Electronics and suitable for cellular handset VCO supplies, wireless PCMCIA card power, and portable medical instrument sensor bias requiring stable component supply with industrial temperature qualification and long-term lifecycle support.
Supply support for LTC1682IMS8#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 LTC1682IMS8#TRPBF belongs to Linear's precision micropower power management family, designed specifically for noise-sensitive RF and analog signal chains in battery-powered wireless equipment.
FAQ
What is the maximum output current capability of the LTC1682IMS8#TRPBF?
The LTC1682IMS8#TRPBF delivers up to 50mA of continuous regulated output current at 3.3V while maintaining specified line/load regulation and thermal safety. At higher currents, the internal LDO enters dropout or triggers thermal shutdown depending on ambient conditions and PCB copper area. Derating is required above 40mA in enclosed industrial enclosures without airflow.
Can the LTC1682IMS8#TRPBF operate from a single 1.8V alkaline cell?
Yes-the LTC1682IMS8#TRPBF supports input voltages as low as 1.8V, enabling direct operation from one fresh alkaline cell (nominal 1.5V, up to 1.65V under light load). Its 550kHz charge pump efficiently doubles this to ~3.3V for the LDO stage. Performance remains within spec down to 1.8V, though output current capability decreases linearly as VIN drops below 2.5V.
Why does the LTC1682IMS8#TRPBF require a 1nF capacitor on the FILT pin?
The FILT pin connects to the internal 1.235V bandgap reference. A 1nF capacitor to ground minimizes high-frequency noise coupling into the reference, which directly impacts output voltage accuracy and noise floor. Omitting it increases measured VOUT noise by ~25% and degrades load regulation-this capacitor is mandatory to achieve the specified 64µVRMS performance of the LTC1682IMS8#TRPBF.
Is the LTC1682IMS8#TRPBF pin-compatible with the LTC1682CS8-3.3?
No-the LTC1682IMS8#TRPBF uses an 8-pin MSOP package, while the LTC1682CS8-3.3 uses an 8-pin SOIC (narrow) package. Though both have identical pin functions and electrical behavior, their footprints, thermal characteristics, and solder reflow profiles differ. Direct PCB replacement requires layout revision; however, schematic-level substitution is fully supported.
How does Burst Mode affect noise and efficiency in the LTC1682IMS8#TRPBF?
Burst Mode activates automatically when output current falls below ~100µA. It disables the 550kHz oscillator between charge cycles, reducing quiescent current to 150µA but increasing output noise by ~30% (to ~83µVRMS). This trade-off prioritizes battery life over noise in sleep states-Burst Mode is transparent to system software and requires no configuration.
LTC1682IMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 4.4V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 50mA
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1682IMS8#TRPBF FAQ
1.How can I place an order for LTC1682IMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682IMS8#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 LTC1682IMS8#TRPBF reliable?
The price and inventory of LTC1682IMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682IMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1682IMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682IMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682IMS8#TRPBF?
LTC1682IMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682IMS8#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 LTC1682IMS8#TRPBF?
For technical support, including LTC1682IMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682IMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1682IMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1682IMS8#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 LTC1682IMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1682IMS8#TRPBF?
All LTC1682IMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682IMS8#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 LTC1682IMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1682IMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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