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Analog Devices Inc. LTC1682IMS8-3.3#TRPBF
- Part No.:
- LTC1682IMS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1682IMS8-3.3#TRPBF.pdf
- Description:
- IC REG CHRG PUMP 3.3V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,624
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Product details
Overview
LTC1682IMS8-3.3#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 LTC1682IMS8-3.3#TRPBF datasheet, LTC1682IMS8-3.3#TRPBF pinout, LTC1682IMS8-3.3#TRPBF application, or LTC1682IMS8-3.3#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world application constraints, and two rigorously cross-checked alternative parts for low-noise VCO supply design.
Technical Context
The LTC1682IMS8-3.3#TRPBF integrates a 550kHz switched-capacitor voltage doubler and a low-dropout linear regulator in a single MSOP-8 package. The charge pump generates ~2×VIN at CPO, which feeds the LDO stage; regulation is achieved via internal 1.235V reference and trimmed oscillator, with no external compensation required.
It features Burst Mode™ operation below 100µA load to reduce quiescent current to 150µA, while maintaining <60µVRMS noise performance. Internal thermal shutdown (150°C trip) and current limiting protect against fault conditions, and the LDO remains stable with ≥2µF ceramic output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over full temperature range; enables direct replacement of standard 3.3V LDOs without feedback network. |
| Output Noise | 58µVRMS (10Hz–100kHz); critical for minimizing phase noise in 900MHz/2.4GHz VCO power rails. |
| Input Voltage Range | 2.0V to 4.4V; supports single-cell Li-ion (3.0–4.2V), NiMH, or regulated 3.3V system rails. |
| Max Output Current | 50mA continuous; sufficient for biasing VCOs, PLLs, and low-power RF front-end ICs. |
| Quiescent Current | 150µA typical (0°C–85°C); enables always-on low-noise supply in battery-powered portable radios. |
| Shutdown Current | 1µA max; allows deep-sleep mode with fast wake-up (<2ms enable time). |
| Switching Frequency | 550kHz ±70kHz; high enough to avoid audio band, low enough to minimize EMI in sensitive RF sections. |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), thermally enhanced for industrial temperature operation (–40°C to +85°C). GND pin (Pin 4) serves as primary thermal path; recommended PCB layout includes large copper pour connected directly to Pin 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | 3.3V low-noise supply rail; requires ≥2µF low-ESR ceramic capacitor placed adjacent to pin for stability and noise suppression. |
| SHDN (Pin 2) | Active-low enable | Pull ≤0.4V to disable; connects VOUT to ground via 100Ω switch and reduces IIN to 1µA. |
| FILT (Pin 3) | Reference filter node | Connects to 1nF capacitor to ground; essential for achieving specified 58µVRMS noise performance. |
| GND (Pin 4) | System ground & thermal pad | Primary return path and heat sink; must be tied to solid ground plane with multiple vias. |
| C– (Pin 5) | Flying capacitor negative terminal | Completes charge pump flying cap loop; requires 0.22µF ceramic capacitor with low ESR and tight placement. |
| VIN (Pin 6) | Main input supply | Accepts 2.0–4.4V; bypassed with ≥2µF ceramic cap near pin to suppress input ripple and transient currents. |
| C+ (Pin 7) | Flying capacitor positive terminal | Paired with C– to form charge transfer path; same layout rules apply as for C–. |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate rail; bypassed with ≥2µF ceramic cap; drives internal LDO and may power auxiliary regulators. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic EMI and board area overhead; enables compact RF module designs using only ceramic caps. |
| Integrated LDO filtering | Reduces CPO switching ripple by >40dB; delivers clean 3.3V rail without external LC filters or ferrite beads. |
| Thermal & short-circuit protection | Auto-recovers from overtemperature (>150°C) and indefinite VOUT short-to-ground; ensures robust field operation. |
| Burst Mode™ efficiency | Reduces operating current to 150µA at light loads while preserving noise performance-critical for standby power budgets. |
| MSOP-8 industrial temp grade | Rated for –40°C to +85°C junction temperature; qualified per AEC-Q200 stress test conditions for automotive infotainment modules. |
Applications
| Cellular Transceiver Power | Wireless PCMCIA Card |
|---|---|
Use Scenario: Providing ultra-low-noise 3.3V supply to VCO and PLL circuits in GSM/EDGE baseband transceivers. IC Role / Device Role / Timing Role: Dedicated low-noise power source for frequency synthesis blocks; replaces discrete charge pump + LDO solutions. Use Value: Reduces close-in phase noise by >10dB compared to standard LDOs, improving EVM and adjacent channel leakage ratio (ACLR). |
Use Scenario: Powering RF front-end ICs in legacy 16-bit PCMCIA wireless LAN cards operating from 3.3V host bus. IC Role / Device Role / Timing Role: Generates clean 3.3V rail from noisy 3.3V system supply; isolates RF section from digital switching noise. Use Value: Enables reliable 802.11b operation in electrically congested laptop environments without redesigning power delivery network. |
| Portable Medical Telemetry | Remote Industrial Sensor Transmitter |
Use Scenario: Supplying analog front-end and RF transmitter in battery-powered ECG telemetry units. IC Role / Device Role / Timing Role: Low-quiescent, low-noise DC-DC converter enabling multi-day operation on coin cell or small Li-ion. Use Value: Achieves 50mA output at 150µA IQ, extending battery life >3× versus standard boost-LDO combinations. |
Use Scenario: Powering sub-GHz ISM band transmitters in solar-powered remote monitoring nodes. IC Role / Device Role / Timing Role: Converts variable 2.5–4.2V solar/battery input into stable 3.3V rail for RF IC and microcontroller. Use Value: Maintains regulation down to 2.0V VIN, allowing deeper battery discharge and higher energy utilization efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise VCO supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1682IMS8-5#TRPBF | Fixed 5.0V output; 64µVRMS noise; identical pinout and thermal specs. | Used where VCO requires 5V bias (e.g., older GaAs-based oscillators); not drop-in for 3.3V systems. | Select only if target VCO datasheet specifies 5V nominal supply; verify CPO headroom margin at minimum VIN. |
| LT3045IMSE#PBF | Ultra-low-noise (0.8µVRMS) 200mA LDO; requires external 3.3V input; no charge pump. | Superior noise but needs pre-regulated 3.3V rail; adds system-level complexity and cost. | Choose when absolute lowest phase noise is mandatory and 3.3V input is already available; avoid if input is <3.3V or battery-derived. |
Compared with LTC1682IMS8-3.3#TRPBF, LTC1682IMS8-5#TRPBF offers higher output voltage but same noise floor and footprint, while LT3045IMSE#PBF delivers dramatically lower noise at the cost of requiring an external regulated input and forfeiting input voltage flexibility.
Availability
LTC1682IMS8-3.3#TRPBF is available at Aetrix Electronics and suitable for cellular transceivers, wireless PCMCIA cards, portable medical telemetry, remote industrial sensor transmitters, and low-power RF modules requiring stable component supply across extended temperature ranges.
Supply support for LTC1682IMS8-3.3#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 continuity, documentation, and manufacturing for the LTC portfolio. Linear's legacy expertise in precision analog and power management remains core to ADI's signal chain strategy.
The LTC1682IMS8-3.3#TRPBF belongs to Linear's low-noise power management family, specifically engineered to replace discrete charge pump + LDO solutions in RF subsystems where phase noise, board space, and input voltage flexibility are critical.
FAQ
What is the minimum input voltage required for LTC1682IMS8-3.3#TRPBF to regulate 3.3V output?
The LTC1682IMS8-3.3#TRPBF requires a minimum input voltage of 2.0V to maintain regulation at 3.3V output across the full industrial temperature range (–40°C to +85°C). Below 2.0V, the internal LDO drops out and VOUT follows CPO, which itself falls below usable levels due to charge pump inefficiency and dropout voltage.
Can LTC1682IMS8-3.3#TRPBF drive a 50mA load continuously at 85°C ambient?
Yes, LTC1682IMS8-3.3#TRPBF is rated for 50mA continuous output at –40°C to +85°C junction temperature. However, thermal design is critical: with θJA = 140°C/W in MSOP-8, 50mA at 4.4V input dissipates ~125mW; a 25°C ambient requires ≤100°C rise, achievable only with ≥2cm² copper pour tied to Pin 4 (GND).
Is the FILT pin on LTC1682IMS8-3.3#TRPBF optional for basic operation?
No-the FILT pin (Pin 3) is mandatory for achieving the specified 58µVRMS output noise. Leaving it unconnected degrades noise performance by >30%, and connecting a 1nF capacitor to ground is required per datasheet Figure 11 and Electrical Characteristics table footnote.
Does LTC1682IMS8-3.3#TRPBF support automatic power-on reset sequencing?
Yes, LTC1682IMS8-3.3#TRPBF includes an internal power-on reset (POR) circuit that holds the LDO disabled until VIN reaches ~1V, then enables regulation once CPO rises above 1.75×VIN. This prevents undershoot and uncontrolled turn-on in systems with slow-ramping supplies.
What happens to VOUT during shutdown of LTC1682IMS8-3.3#TRPBF?
When SHDN is pulled low, LTC1682IMS8-3.3#TRPBF actively discharges VOUT to ground through an internal 100Ω switch, ensuring rapid rail collapse. This prevents floating outputs and unintended biasing of downstream RF components during sleep mode.
LTC1682IMS8-3.3#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1682IMS8-3.3#TRPBF FAQ
1.How can I place an order for LTC1682IMS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682IMS8-3.3#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 LTC1682IMS8-3.3#TRPBF reliable?
The price and inventory of LTC1682IMS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682IMS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1682IMS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682IMS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682IMS8-3.3#TRPBF?
LTC1682IMS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682IMS8-3.3#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 LTC1682IMS8-3.3#TRPBF?
For technical support, including LTC1682IMS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682IMS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1682IMS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1682IMS8-3.3#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 LTC1682IMS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1682IMS8-3.3#TRPBF?
All LTC1682IMS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682IMS8-3.3#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 LTC1682IMS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1682IMS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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