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Analog Devices Inc. LTC1682IS8#PBF
- Part No.:
- LTC1682IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1682IS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:125
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Product details
Overview
LTC1682IS8#PBF from Analog Devices (formerly Linear Technology) is an adjustable-output, low-noise charge pump doubler with integrated LDO regulator, designed for powering noise-sensitive RF circuitry such as VCOs in cellular handsets and wireless modules. It accepts 1.8V–4.4V input, delivers up to 50mA at 2.5V–5.5V output, achieves 60µVRMS output noise (100kHz BW), operates at 550kHz switching frequency, and features thermal shutdown and current limiting.
For engineers reviewing the LTC1682IS8#PBF datasheet, LTC1682IS8#PBF pinout, LTC1682IS8#PBF application, or LTC1682IS8#PBF equivalent, key selection criteria include its ultra-low noise performance, absence of inductors, compatibility with ceramic capacitors only, fixed-temperature-stable reference (±50ppm/°C), and operation across –40°C to +85°C industrial temperature range.
Technical Context
The LTC1682IS8#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; the LDO then provides a low-noise, regulated VOUT independent of CPO ripple. Its internal 1.235V bandgap reference and trimmed 550kHz oscillator ensure stable regulation and minimal phase noise coupling into RF loads.
Operation includes Burst Mode for efficiency below 100µA load (reducing quiescent current to 150µA), automatic LDO enable/disable based on CPO voltage thresholds (1.75×VIN enable, 1.45×VIN disable), and internal protection against overtemperature (>150°C) and short-circuit conditions. Pin 3 functions as FB for the adjustable LTC1682 variant, enabling external resistor-based output programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 4.4V - supports single-cell Li-ion, NiMH, or dual-cell alkaline supplies without external regulators. |
| Output Voltage Range | 2.5V to 5.5V (adjustable via FB pin) - enables precise biasing of VCOs, PLLs, and analog front-ends. |
| Output Noise | 60µVRMS (10Hz–100kHz) - meets stringent spectral purity requirements for RF synthesizers. |
| Max Output Current | 50mA - sufficient for powering high-frequency VCO cores and low-power RF ICs. |
| Quiescent Current | 150µA (operating), 1µA (shutdown) - extends battery life in portable wireless devices. |
| Switching Frequency | 550kHz (±70kHz) - places switching energy beyond sensitive IF bands and simplifies EMI filtering. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive-adjacent wireless applications. |
Pinout & Package
Package: 8-pin SO (Small Outline, narrow 0.150"), RoHS-compliant, lead-free (Pb-free) finish per #PBF suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | Low-noise LDO output; requires ≥2µF low-ESR ceramic capacitor for stability and transient response. |
| SHDN (Pin 2) | Shutdown control | Active-low logic input; pulls VOUT to ground via 100Ω switch when asserted, reducing supply current to <5µA. |
| FB (Pin 3) | Feedback node | Connects to external resistor divider to set VOUT = 1.235V × (1 + R1/R2); input bias current ±50nA enables high-impedance design. |
| GND (Pin 4) | System ground | Main return path for LDO, charge pump, and internal references; must connect to low-impedance PCB ground plane. |
| C– (Pin 5) | Flying capacitor negative | AC-coupled terminal of flying capacitor (C1 = 0.22µF); forms charge transfer path with C+. |
| VIN (Pin 6) | Input supply | Primary power input (1.8V–4.4V); requires ≥2µF low-ESR bypass capacitor close to pin. |
| C+ (Pin 7) | Flying capacitor positive | AC-coupled terminal opposite C–; completes charge pump doubler topology with C1. |
| CPO (Pin 8) | Charge pump output | Unregulated ~2×VIN intermediate rail; powers LDO stage; requires ≥2µF low-ESR capacitor to minimize ripple. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI, enabling compact, low-profile layouts in space-constrained RF modules. |
| Integrated LDO filtering | Reduces CPO switching ripple by >40dB, delivering clean DC output without external LC filters. |
| Thermal & short-circuit protection | Automatically disables output above 150°C junction temperature and limits fault current indefinitely without latch-up. |
| Low-ESR capacitor compatibility | Stable with ≥2µF ceramic output caps and 0.22µF flying cap - avoids costly tantalum or electrolytic solutions. |
| Industrial temperature grade | Guaranteed operation from –40°C to +85°C - suitable for outdoor wireless infrastructure and portable medical instruments. |
Applications
| Cellular Transceiver Power | Wireless PCMCIA Card Supply |
|---|---|
Use Scenario: Providing ultra-low-noise 3.3V or 5V supply to VCOs and PLLs in GSM/EDGE handset transceivers. IC Role / Device Role / Timing Role: Primary low-noise bias rail generator; replaces discrete charge pump + LDO combinations. Use Value: Enables <–140dBc/Hz close-in phase noise at 902MHz (per typical application TA02), critical for adjacent-channel rejection. |
Use Scenario: Generating regulated 3.3V from 3.3V or 5V host bus in IEEE 802.11b PCMCIA cards. IC Role / Device Role / Timing Role: Local boost-and-regulate supply for RF front-end ICs and baseband processors. Use Value: Delivers 50mA with <60µVRMS noise while occupying <15mm² PCB area - no inductor footprint required. |
| Portable Medical Instrument Bias | Remote Wireless Sensor Transmitter |
Use Scenario: Powering low-phase-noise clock sources and analog signal chains in handheld ultrasound or ECG units. IC Role / Device Role / Timing Role: Clean auxiliary supply for precision ADC drivers and timing recovery circuits. Use Value: Maintains ±50ppm/°C output stability and <10mV load regulation (1–50mA), ensuring measurement repeatability. |
Use Scenario: Supplying 2.5V–5.5V programmable bias to sub-GHz ISM-band transmitters in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Efficient, low-quiescent boost regulator supporting long-life coin-cell or AA operation. Use Value: Achieves 1µA shutdown current and 150µA operating current - extends 10-year battery life in maintenance-free deployments. |
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#PBF | Same silicon, MSOP-8 package (3mm × 3mm); 120°C/W θJA vs 140°C/W for SO-8. | Better thermal performance in dense layouts; preferred for high-ambient or continuous 50mA operation. | Select LTC1682IMS8#PBF when board space allows smaller footprint and thermal management is critical. |
| LTC1522CS8#PBF | Fixed 5V output only; 6µA quiescent current; no LDO stage - higher output ripple (500µVP-P). | Suitable for non-RF digital loads where ultra-low noise is unnecessary but micropower is essential. | Choose LTC1522CS8#PBF only for cost-sensitive, non-noise-critical applications requiring <10µA IQ. |
Compared with LTC1682IMS8#PBF, the LTC1682IS8#PBF offers identical electrical performance in a larger SO-8 package with higher thermal resistance but lower assembly cost; versus LTC1522CS8#PBF, it trades 144× higher quiescent current for 8.3× lower output noise and full adjustability - making it the sole choice for RF VCO biasing.
Availability
LTC1682IS8#PBF is available at Aetrix Electronics and suitable for cellular transceivers, wireless PCMCIA cards, portable medical instruments, remote sensor transmitters, and low-power data acquisition systems requiring stable component supply across industrial temperature grades.
Supply support for LTC1682IS8#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 product support, documentation, and manufacturing continuity for all Linear legacy parts including the LTC portfolio.
The LTC1682IS8#PBF belongs to Linear's precision power management family, engineered specifically for RF and mixed-signal applications demanding ultra-low-noise, inductorless voltage boosting with robust protection and wide input flexibility.
FAQ
What is the maximum output current capability of the LTC1682IS8#PBF?
The LTC1682IS8#PBF delivers up to 50mA of continuous output current at VOUT while maintaining regulation and specified noise performance. At higher loads, dropout voltage increases (e.g., 160mV at 10mA for 2.57V output), and thermal limits may constrain sustained operation - especially near upper VIN and temperature extremes. Derating is recommended above 40mA in enclosed environments.
Does the LTC1682IS8#PBF require external inductors?
No, the LTC1682IS8#PBF uses a switched-capacitor doubler architecture and requires only two external ceramic capacitors: a 0.22µF flying capacitor (C1) between C+ and C– pins, and ≥2µF output capacitor (C2) on VOUT. No inductors, transformers, or ferrite beads are needed - simplifying layout and eliminating magnetic EMI concerns.
How does the LTC1682IS8#PBF achieve its low output noise specification?
The LTC1682IS8#PBF achieves 60µVRMS noise through cascaded noise reduction: the charge pump operates at 550kHz (away from sensitive RF bands), its output (CPO) is filtered by the integrated LDO, and the LDO uses a precision 1.235V bandgap reference with ±50ppm/°C drift. Combined with low-ESR ceramic capacitors and optimized internal slew control, this architecture suppresses both switching artifacts and thermal noise.
Can the LTC1682IS8#PBF be used with input voltages below 1.8V?
No - the absolute minimum input voltage for the LTC1682IS8#PBF is 1.8V, as confirmed by Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold risks failure to start, unstable regulation, or undefined behavior. For sub-1.8V inputs, alternative solutions like the LTC3526L (1.8V min) or discrete boost-LDO combinations must be evaluated.
What is the function of Pin 3 (FB) on the LTC1682IS8#PBF?
Pin 3 on the LTC1682IS8#PBF is the Feedback (FB) input, which connects to the center tap of an external resistor divider between VOUT and GND. The internal error amplifier compares FB voltage to a precise 1.235V reference to regulate VOUT = 1.235V × (1 + R1/R2). This enables user-defined output voltages from 2.5V to 5.5V - distinguishing it from fixed-output variants LTC1682-3.3IS8#PBF and LTC1682-5IS8#PBF.
LTC1682IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LTC1682IS8#PBF FAQ
1.How can I place an order for LTC1682IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682IS8#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 LTC1682IS8#PBF reliable?
The price and inventory of LTC1682IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1682IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682IS8#PBF?
LTC1682IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682IS8#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 LTC1682IS8#PBF?
For technical support, including LTC1682IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682IS8#PBF requirements.
6.How does Aetrix verify that LTC1682IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1682IS8#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 LTC1682IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1682IS8#PBF?
All LTC1682IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682IS8#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 LTC1682IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1682IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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