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Analog Devices Inc. LTC1682IMS8#PBF
- Part No.:
- LTC1682IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1682IMS8#PBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
LTC1682IMS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, low-noise, adjustable-output charge pump doubler with integrated LDO regulator. It accepts 1.8V–4.4V input, delivers up to 50mA at 2.5V–5.5V regulated output, and achieves 60µVRMS noise (100kHz BW). Designed for powering noise-sensitive VCOs in cellular phones and wireless PCMCIA cards, it eliminates inductors and uses only ceramic capacitors.
For engineers reviewing the LTC1682IMS8#PBF datasheet, LTC1682IMS8#PBF pinout, LTC1682IMS8#PBF application, or LTC1682IMS8#PBF equivalent, key selection criteria include its 550kHz switching frequency, 150µA operating current, 1µA shutdown current, MSOP-8 package compatibility, and fixed/adjustable output variants - all critical for low-power RF supply design.
Technical Context
The LTC1682IMS8#PBF integrates a switched-capacitor voltage doubler and a low-dropout linear regulator in a single die. The doubler generates ~2×VIN at CPO, which feeds the LDO stage; regulation occurs via internal 1.235V reference and FB feedback loop. Burst Mode operation engages below 100µA load to reduce quiescent current while accepting slightly higher noise.
Thermal shutdown (150°C trip) and current limiting protect against overload. The LDO remains stable with ≥2µF ceramic output capacitance and exhibits <100mV dropout at 10mA. Pin 3 functions as FB for the adjustable LTC1682 variant, enabling precise output setting via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 4.4V - supports single-cell Li-ion, NiMH, or 3.3V system rails without level-shifting. |
| Output Voltage Range | 2.5V to 5.5V (adjustable) - set by external R1/R2 divider; enables flexible biasing of RF ICs. |
| Output Noise | 60µVRMS (10Hz–100kHz) - low enough for high-frequency VCOs requiring clean supply. |
| Switching Frequency | 550kHz - fixed, trimmed oscillator avoids EMI overlap with sensitive IF bands. |
| Quiescent Current | 150µA - enables multi-day battery life in portable transmitters and pagers. |
| Shutdown Current | 1µA - ensures negligible drain during sleep modes in always-on wireless devices. |
| Max Output Current | 50mA - sufficient for VCO core bias and low-power PLL circuits. |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), rated for –40°C to 85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | Low-noise LDO output; requires ≥2µF ceramic capacitor directly at pin for stability and ripple suppression. |
| SHDN (Pin 2) | Enable control input | Active-high logic; pulls VOUT to ground via 100Ω switch when low; connects to VIN for always-on operation. |
| FB (Pin 3) | Feedback node | Connects to resistor divider from VOUT; internal error amplifier compares to 1.235V reference to regulate output. |
| GND (Pin 4) | Power and signal reference | Main return path; must connect to low-impedance ground plane to minimize noise coupling into LDO. |
| C– (Pin 5) | Flying capacitor negative terminal | Completes charge transfer path for doubler; requires 0.22µF low-ESR ceramic capacitor. |
| VIN (Pin 6) | Main power input | Accepts 1.8V–4.4V; bypassed with ≥2µF ceramic cap near pin to suppress supply ripple and transient spikes. |
| C+ (Pin 7) | Flying capacitor positive terminal | Alternates polarity with C– during charge pump cycle; same capacitor used for both C+ and C–. |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate voltage; powers LDO stage; requires ≥2µF ceramic cap to limit droop and spike energy. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Enables compact, EMI-optimized layouts using only ceramic capacitors - no magnetic components or layout-sensitive inductors required. |
| Integrated thermal/current protection | Automatic shutdown at >150°C junction temp and internal current limiting prevent damage during short-circuit or overload conditions. |
| Burst Mode efficiency optimization | Reduces operating current to ~150µA under light loads (<100µA), extending battery life without sacrificing regulation accuracy. |
| Stable with minimal output capacitance | Guaranteed stability with ≥2µF ceramic output cap - eliminates need for large tantalum or electrolytic capacitors. |
| Low-ESR capacitor compatibility | Designed explicitly for ceramic capacitors on VIN, C+, C–, CPO, and VOUT - reduces board area and cost vs. hybrid solutions. |
Applications
| Cellular Phone VCO Power | Wireless PCMCIA Card Supply |
|---|---|
Use Scenario: Providing ultra-low-noise 3.3V or 5V bias to voltage-controlled oscillators in GSM/CDMA handsets during transmit bursts. IC Role / Device Role / Timing Role: Primary low-noise regulated supply for VCO core and tuning diode, replacing noisy switching regulators or inefficient LDOs fed from higher-voltage rails. Use Value: 60µVRMS output noise prevents phase noise degradation in 900MHz/1.8GHz VCOs, maintaining EVM and spectral mask compliance. |
Use Scenario: Generating clean 3.3V supply for RF front-end ICs and baseband processors in laptop wireless LAN adapters. IC Role / Device Role / Timing Role: Compact, inductorless boost-LDO solution delivering regulated rail from 3.3V host bus, eliminating need for separate DC/DC converter. Use Value: MSOP-8 footprint and ceramic-only BOM reduce PCB area by >40% vs. discrete charge pump + LDO designs, easing integration into space-constrained card edge connectors. |
| 2-Way Pager RF Section | Portable Medical Instrument Sensor Bias |
Use Scenario: Powering narrowband FM transmitter VCOs and mixer bias networks in battery-operated two-way messaging devices. IC Role / Device Role / Timing Role: Micropower, low-noise supply generator enabling >72-hour standby time while maintaining RF signal purity during brief transmission windows. Use Value: 1µA shutdown current and 150µA operating current extend coin-cell or AA battery life; 550kHz switching avoids interference with pager receive frequencies. |
Use Scenario: Delivering stable, low-noise 2.5V–5V bias to precision analog front-ends (e.g., EEG, ECG amplifiers) in handheld diagnostic tools. IC Role / Device Role / Timing Role: Isolated, low-ripple supply source decoupled from noisy digital subsystems - critical for sub-µV-level biomedical signal integrity. Use Value: 60µVRMS noise floor and <100mV dropout ensure sensor excitation remains free of switching artifacts, preserving ADC effective resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise charge pump + LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1682CMS8 | Same silicon, commercial temperature grade (0°C to 70°C) vs. industrial (–40°C to 85°C). | Suitable for non-ruggedized consumer electronics; not qualified for automotive or industrial ambient extremes. | Select LTC1682IMS8#PBF for deployments requiring guaranteed performance across –40°C to 85°C. |
| LTC1522CS8 | Fixed 5V output only; 6µA quiescent current; no LDO stage - outputs unregulated charge pump voltage with higher ripple. | Lacks low-noise regulation; unsuitable for VCOs or precision analog circuits needing <100µV noise. | Choose LTC1682IMS8#PBF when noise-sensitive regulation is mandatory; LTC1522CS8 only for cost-sensitive, ripple-tolerant digital bias. |
Compared with LTC1682CMS8, the LTC1682IMS8#PBF offers extended temperature reliability without trade-offs in noise or efficiency; versus LTC1522CS8, it adds critical LDO filtering and adjustable output - making it the sole option among these three for RF VCO supply where phase noise and thermal robustness are non-negotiable.
Availability
LTC1682IMS8#PBF is available at Aetrix Electronics and suitable for cellular phone VCO power supplies, wireless PCMCIA card RF sections, and portable medical instrument sensor bias requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1682IMS8#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear products including the LTC series.
The LTC1682IMS8#PBF belongs to Linear's precision power management portfolio, engineered specifically for RF and analog systems demanding ultra-low-noise, inductorless voltage boosting in space-constrained, battery-powered applications.
FAQ
What is the maximum output current capability of the LTC1682IMS8#PBF?
The LTC1682IMS8#PBF delivers up to 50mA of continuous regulated output current at VOUT while maintaining specified line/load regulation and noise performance. Peak short-circuit current is limited to ~90mA by internal circuitry, and thermal shutdown activates if junction temperature exceeds 150°C under sustained overload.
Does the LTC1682IMS8#PBF require external inductors?
No, the LTC1682IMS8#PBF uses a switched-capacitor doubler architecture and requires only ceramic capacitors: one 0.22µF flying capacitor (C1) between C+ and C–, and ≥2µF ceramic capacitors on VIN, CPO, and VOUT. This eliminates inductors entirely, reducing EMI, cost, and PCB area.
How does the LTC1682IMS8#PBF achieve low output noise?
The LTC1682IMS8#PBF achieves 60µVRMS noise (10Hz–100kHz) through dual-stage noise reduction: first, a precisely controlled 550kHz charge pump minimizes switching spike energy; second, an integrated LDO with 1.235V bandgap reference filters residual ripple. Layout with low-ESR ceramics and ground-plane routing is essential to realize this spec.
What is the function of Pin 3 (FB) on the LTC1682IMS8#PBF?
Pin 3 on the LTC1682IMS8#PBF is the FB (feedback) input. It connects to the center tap of an external resistor divider between VOUT and GND, allowing adjustment of the regulated output voltage using VOUT = 1.235V × (1 + R1/R2). This distinguishes the adjustable LTC1682 from fixed-output variants like LTC1682-3.3IMS8#PBF.
Can the LTC1682IMS8#PBF operate from a 1.8V input supply?
Yes, the LTC1682IMS8#PBF is fully specified to operate from 1.8V to 4.4V input. At 1.8V input, it generates ~3.6V at CPO, enabling regulated outputs down to 2.5V. Startup is guaranteed once VIN exceeds ~1V, and the internal power-on reset ensures reliable initialization across the full input range.
LTC1682IMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1682IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682IMS8#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 LTC1682IMS8#PBF reliable?
The price and inventory of LTC1682IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1682IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682IMS8#PBF?
LTC1682IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682IMS8#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 LTC1682IMS8#PBF?
For technical support, including LTC1682IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682IMS8#PBF requirements.
6.How does Aetrix verify that LTC1682IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1682IMS8#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 LTC1682IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1682IMS8#PBF?
All LTC1682IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682IMS8#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 LTC1682IMS8#PBF part is unused and in its original packaging.
Return procedure for LTC1682IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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