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Analog Devices Inc. LTC1682CMS8-3.3#TRPBF
- Part No.:
- LTC1682CMS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1682CMS8-3.3#TRPBF.pdf
- Description:
- IC REG CHRG PUMP 3.3V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,585
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Product details
Overview
LTC1682CMS8-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-output 3.3V doubler charge pump with integrated low-noise LDO regulator, designed for powering noise-sensitive RF circuitry such as VCOs in wireless transceivers. It operates from 2.0V to 4.4V input, delivers up to 50mA output current, achieves 58µVRMS output noise (10Hz–100kHz), and uses only ceramic capacitors-no inductors required.
For engineers reviewing the LTC1682CMS8-3.3#TRPBF datasheet, LTC1682CMS8-3.3#TRPBF pinout, LTC1682CMS8-3.3#TRPBF application, or LTC1682CMS8-3.3#TRPBF equivalent, key selection criteria include its 3.3V fixed regulated output, 550kHz switching frequency, 1µA shutdown current, MSOP-8 package compatibility, and suitability for low-phase-noise RF power supply designs where ripple rejection and thermal stability are critical.
Technical Context
The LTC1682CMS8-3.3#TRPBF integrates a switched-capacitor voltage doubler and a low-dropout linear regulator in a single die. The charge pump generates ~2×VIN at CPO, which feeds an internal LDO that filters switching ripple and regulates precisely to 3.3V with ±70mV total output variation over temperature and load.
Its architecture includes burst-mode operation below 100µA load to reduce quiescent current, internal thermal shutdown (150°C trip), current limiting, and a dedicated FILT pin for 1nF reference filtering-enabling stable, ultra-low-noise performance without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.23V–3.37V) at 1mA, stable across –40°C to 85°C industrial range |
| Output Noise | 58µVRMS (10Hz–100kHz) with 1nF FILT capacitor-meets stringent VCO supply requirements |
| Input Range | 2.0V to 4.4V-supports single-cell Li-ion, NiMH, and 3.3V system rails |
| Max Output Current | 50mA continuous-sufficient for biasing VCOs, PLLs, and low-power RF ICs |
| Shutdown Current | 1µA typical-enables battery-critical always-on subsystems with minimal leakage |
| Switching Frequency | 550kHz ±70kHz-high enough to avoid audible noise, low enough for efficient ceramic capacitor use |
| Dropout Voltage | 75mV at 10mA-ensures regulation even at low VIN (e.g., 2.5V input → 3.3V out) |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, thermally enhanced for PCB heat dissipation via exposed pad (not electrically connected).
| 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 transient response |
| SHDN (Pin 2) | Enable control input | Active-high logic; <0.4V disables device, connects VOUT to ground via 100Ω switch, reduces IIN to 1µA |
| FILT (Pin 3) | Reference filter node | High-impedance internal bandgap reference filter point; 1nF capacitor to GND minimizes reference noise and improves VOUT accuracy |
| GND (Pin 4) | Power and signal reference | Main return path for charge pump, LDO, and all internal circuits; must connect to solid ground plane for noise control |
| C– (Pin 5) | Flying capacitor negative terminal | Connects to negative side of 0.22µF flying capacitor; forms charge transfer path with C+ |
| VIN (Pin 6) | Main input supply | 2.0V–4.4V input; bypassed with ≥2µF low-ESR ceramic capacitor close to pin to suppress supply ripple |
| C+ (Pin 7) | Flying capacitor positive terminal | Connects to positive side of 0.22µF flying capacitor; switches between VIN and CPO during charge cycles |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate rail (~4.0V–8.8V); bypassed with ≥2µF low-ESR capacitor; powers internal LDO |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic EMI, board area, and cost of inductors-uses only 0.22µF flying + 4.7µF output ceramics |
| Ultra-low output noise | 58µVRMS (10Hz–100kHz) enables direct powering of high-frequency VCOs without additional LDO filtering |
| Integrated FILT pin | Dedicated 1nF reference filter node ensures <±50ppm/°C VOUT drift and tight line/load regulation (≤20mV) |
| Burst-mode efficiency | Reduces operating current to 150µA at no load while maintaining low-noise performance under dynamic load conditions |
| Robust protection | Internal thermal shutdown (150°C), current limiting, and indefinite VOUT short-circuit tolerance ensure field reliability |
Applications
| Cellular Transceiver VCO Supply | Wireless PCMCIA Card Power |
|---|---|
Use Scenario: Providing clean 3.3V bias to voltage-controlled oscillators in GSM/EDGE baseband modules. IC Role / Device Role / Timing Role: Primary low-noise regulated supply for VCO core-replaces discrete LDO + boost converter combos. Use Value: 58µVRMS noise prevents phase jitter degradation; 550kHz switching avoids interference in 900MHz/1.8GHz bands. |
Use Scenario: Powering RF front-end ICs in portable laptop wireless adapters requiring compact, battery-efficient design. IC Role / Device Role / Timing Role: Single-chip 3.3V boost+regulation solution eliminating external inductors and reducing BOM count by 4+ components. Use Value: 1µA shutdown current extends standby time; MSOP-8 footprint fits tight card-edge layouts without compromising thermal performance. |
| Portable Medical Telemetry | Remote Industrial Sensor Transmitter |
Use Scenario: Supplying stable 3.3V to low-power ISM-band transmitters in wearable ECG monitors. IC Role / Device Role / Timing Role: Noise-immune power source for RF ICs operating in electromagnetically noisy clinical environments. Use Value: Internal thermal shutdown and current limiting prevent fault propagation; 2.0V min input supports aging batteries down to 2.2V. |
Use Scenario: Generating regulated 3.3V from 3.6V lithium primary cells in battery-powered LoRaWAN sensor nodes. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent boost regulator enabling >10-year battery life in maintenance-free deployments. Use Value: 150µA operating current at zero load and 50mA capability support intermittent transmit bursts without brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise charge pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1682IMS8-3.3#TRPBF | Same electrical specs but rated for –40°C to 85°C industrial temperature range; identical pinout and footprint | Required for extended-temperature deployments (e.g., outdoor base stations, automotive telematics) | Select when ambient operating temperature exceeds 70°C or long-term reliability under thermal cycling is critical |
| LT3467EDD-3.3#TRPBF | Higher 100mA output, 2.5V–16V input, but 120µVRMS noise and larger 10-lead DFN package | Suitable for higher-current RF loads but less optimal for ultra-low-noise VCO biasing | Choose only if >50mA output or wider input range is mandatory-and noise budget allows 2× higher RMS noise |
Compared with LTC1682IMS8-3.3#TRPBF, the LTC1682CMS8-3.3#TRPBF offers lower cost and sufficient performance for commercial-temperature applications; versus LT3467EDD-3.3#TRPBF, it provides superior noise performance and smaller footprint at the expense of output current headroom.
Availability
LTC1682CMS8-3.3#TRPBF is available at Aetrix Electronics and suitable for cellular transceivers, wireless PCMCIA cards, portable medical telemetry, and remote industrial sensor transmitters requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for LTC1682CMS8-3.3#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 legacy Linear parts including the LTC1682 family.
The LTC1682 series was designed specifically for RF power management-delivering low-noise, inductorless voltage boosting to replace traditional DC/DC + LDO combinations in space-constrained, noise-sensitive wireless systems.
FAQ
What is the minimum input voltage required for the LTC1682CMS8-3.3#TRPBF to regulate 3.3V output?
The LTC1682CMS8-3.3#TRPBF requires a minimum input voltage of 2.0V to maintain 3.3V regulation across temperature and load. Below 2.0V, the internal LDO drops out and VOUT falls proportionally. At 2.0V input, the dropout voltage is ~75mV, allowing stable 3.3V output up to 10mA load-verified per the Electrical Characteristics table on page 3 of the datasheet.
Can the LTC1682CMS8-3.3#TRPBF be used with input voltages above 4.4V?
No-the absolute maximum VIN rating for LTC1682CMS8-3.3#TRPBF is 5.0V, but the guaranteed operating range is strictly 2.0V to 4.4V. Operation above 4.4V risks violating the charge pump's internal voltage limits and may cause premature failure or unregulated output. For inputs >4.4V, a pre-regulator or alternative part like the LTC1682-5 with higher VIN tolerance should be used.
Why does the LTC1682CMS8-3.3#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 stabilizes this node against high-frequency noise and supply ripple, directly improving VOUT accuracy and temperature coefficient (<±50ppm/°C). Omitting it increases output noise by ~15–20% and degrades load regulation-confirmed in Typical Performance Characteristics Figure G09.
Is the LTC1682CMS8-3.3#TRPBF pin-compatible with the adjustable LTC1682CMS8#TRPBF?
No-though both use the MSOP-8 package, Pin 3 is FB (feedback) on the adjustable LTC1682CMS8#TRPBF but FILT (filter) on the LTC1682CMS8-3.3#TRPBF. Swapping them without circuit modification will disable regulation. The pin functions, internal resistor networks, and startup behavior differ fundamentally between versions.
How does burst-mode operation affect noise performance in the LTC1682CMS8-3.3#TRPBF?
In burst mode (active below ~100µA load), the LTC1682CMS8-3.3#TRPBF disables the 550kHz oscillator between charge cycles, reducing quiescent current to 150µA-but introduces low-frequency envelope modulation that raises broadband noise by ~10–15µVRMS. For VCO biasing, continuous mode is recommended; burst mode suits standby or low-duty-cycle sensor biasing where average power matters more than spectral purity.
LTC1682CMS8-3.3#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 4.4V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1682CMS8-3.3#TRPBF FAQ
1.How can I place an order for LTC1682CMS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682CMS8-3.3#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 LTC1682CMS8-3.3#TRPBF reliable?
The price and inventory of LTC1682CMS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682CMS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1682CMS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682CMS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682CMS8-3.3#TRPBF?
LTC1682CMS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682CMS8-3.3#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 LTC1682CMS8-3.3#TRPBF?
For technical support, including LTC1682CMS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682CMS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1682CMS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1682CMS8-3.3#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 LTC1682CMS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1682CMS8-3.3#TRPBF?
All LTC1682CMS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682CMS8-3.3#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 LTC1682CMS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1682CMS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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