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Analog Devices Inc. LTC1682CMS8-5#PBF
- Part No.:
- LTC1682CMS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1682CMS8-5#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
LTC1682CMS8-5#PBF from Analog Devices (formerly Linear Technology) is a fixed-output 5V 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 2.7V to 4.4V input, delivers up to 50mA output current, achieves 64µVRMS output noise (10Hz–100kHz), and uses only ceramic capacitors-no inductors required.
For engineers reviewing the LTC1682CMS8-5#PBF datasheet, LTC1682CMS8-5#PBF pinout, LTC1682CMS8-5#PBF application, or LTC1682CMS8-5#PBF equivalent, key selection criteria include its 5V fixed regulated output, 550kHz switching frequency, MSOP-8 package compatibility, thermal/short-circuit protection, and suitability for low-noise RF power supply design where EMI-sensitive operation is critical.
Technical Context
The LTC1682CMS8-5#PBF 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 the LDO stage; the LDO provides ripple-rejected, stable 5V output with 50mV dropout at 10mA load. Its Burst Mode operation reduces quiescent current to 150µA under light loads while maintaining regulation.
Internal protection includes thermal shutdown (trip at 150°C, restart at 140°C), current limiting, and automatic LDO disable when CPO falls below 1.45×VIN. Pin 3 functions as FILT (not FB), requiring a 1nF capacitor to ground for optimal reference filtering and noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±100mV (guaranteed over –40°C to 85°C, 1mA load) |
| Output Noise | 64µVRMS (10Hz–100kHz bandwidth, 1nF FILT capacitor) |
| Input Voltage Range | 2.7V to 4.4V (minimum VIN ensures stable 5V regulation) |
| Max Output Current | 50mA (continuous, limited by thermal headroom and dropout) |
| Switching Frequency | 550kHz ±70kHz (precisely trimmed oscillator; enables compact capacitor sizing) |
| Quiescent Current | 150µA typical (Burst Mode active at light loads; enables battery longevity) |
| Shutdown Current | 1µA max (SHDN = 0V disconnects VOUT via 100Ω switch and isolates CPO) |
| Dropout Voltage | 50mV typical at 10mA (enables high efficiency even near input voltage limit) |
Pinout & Package
Package: 8-pin MSOP (3mm × 3mm, 0.65mm pitch), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated 5V output | Low-noise LDO output; requires ≥2µF low-ESR ceramic capacitor directly at pin for stability and transient response |
| SHDN (Pin 2) | Active-low enable control | Pull ≤0.4V to enter shutdown (<5µA IIN, VOUT shorted to GND); tie to VIN for always-on operation |
| FILT (Pin 3) | Reference filter node | High-impedance internal reference bypass; connect 1nF capacitor to GND for minimum output noise |
| GND (Pin 4) | Power and signal ground | Main thermal path and return for all internal circuits; must connect to large PCB copper area for thermal management |
| C– (Pin 5) | Flying capacitor negative terminal | Connects to negative side of 0.22µF ceramic flying capacitor; critical for charge pump efficiency and EMI |
| VIN (Pin 6) | Main input supply | 2.7V–4.4V input; bypass with ≥2µF low-ESR capacitor close to pin to suppress rail noise and support peak current demands |
| C+ (Pin 7) | Flying capacitor positive terminal | Connects to positive side of 0.22µF flying capacitor; forms charge transfer path with C– |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate voltage; bypass with ≥2µF low-ESR capacitor; drives internal LDO and may power external regulators |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LDO + charge pump | Eliminates need for external LDO and reduces BOM count while delivering ultra-low-noise 5V from single low-voltage rail |
| No-inductor architecture | Enables compact, low-EMI power solutions in space-constrained RF modules without magnetic component placement challenges |
| 1nF FILT capacitor optimization | Reduces reference noise contribution, enabling 64µVRMS output noise-critical for VCO phase noise performance |
| Thermal and short-circuit protection | Allows indefinite VOUT shorting and automatic recovery from overtemperature (150°C trip), enhancing system reliability in unattended operation |
| Burst Mode efficiency | Maintains <150µA operating current at light loads without sacrificing regulation accuracy or noise performance |
| MSOP-8 footprint | Provides industry-standard 8-pin surface-mount package with superior thermal dissipation vs. SO-8, suitable for high-density RF PCB layouts |
Applications
| Cellular Transceiver Power Supply | Wireless PCMCIA Card |
|---|---|
Use Scenario: Providing clean 5V bias to VCOs and PLLs in GSM/UMTS front-end modules where phase noise directly impacts adjacent channel rejection. IC Role / Device Role / Timing Role: Low-noise regulated power source replacing discrete charge pump + LDO combinations; supplies critical analog RF blocks. Use Value: 64µVRMS noise ensures minimal VCO close-in phase noise degradation, meeting stringent 3GPP spectral mask requirements. | Use Scenario: Generating stable 5V supply for RF transceivers and baseband processors in legacy laptop expansion cards with tight board area constraints. IC Role / Device Role / Timing Role: Integrated boost-LDO power manager eliminating inductors and reducing layout sensitivity in noisy host bus environments. Use Value: MSOP-8 footprint and ceramic-only capacitor requirement enable full RF power solution within 100mm² PCB area. |
| Portable Medical Instrument | Remote Wireless Transmitter |
Use Scenario: Powering low-power RF telemetry circuits (e.g., ISM-band transmitters) in battery-operated patient monitors requiring multi-year runtime. IC Role / Device Role / Timing Role: Primary regulated supply for RF ICs; operates across wide temperature range (–40°C to +85°C) and supports cold-start conditions. Use Value: 1µA shutdown current and 150µA light-load operation extend coin-cell or Li-ion battery life significantly versus alternatives. | Use Scenario: Delivering interference-free 5V to narrowband FSK/OOK transmitters in industrial sensor nodes deployed in electrically noisy factory settings. IC Role / Device Role / Timing Role: EMI-hardened power source with no inductor-induced coupling; immune to magnetic field interference affecting nearby sensors. Use Value: Ceramic-only design and 550kHz fixed-frequency operation avoid variable-frequency noise that could disrupt sensitive analog sensor signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise regulated charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1682IMS8-5 | Same electrical specs but rated for –40°C to 85°C industrial temperature range; MSOP-8 package identical | Required for extended-temperature deployments (e.g., automotive under-hood, outdoor infrastructure) | Select LTC1682IMS8-5 when ambient operating temperature exceeds 70°C or long-term reliability at extremes is mandated |
| LTC1522CS8-5 | Lower IQ (6µA vs. 150µA), no integrated LDO, higher output noise (150µVRMS), SOT-23-5 package | Suitable only for non-noise-critical digital loads; cannot replace LTC1682CMS8-5 in RF analog paths | Choose LTC1522CS8-5 only for ultra-low-power digital logic rails where noise immunity is not required |
Compared with LTC1682IMS8-5, the LTC1682CMS8-5 offers identical functionality at lower cost but with commercial-grade temperature limits; compared with LTC1522CS8-5, it trades higher quiescent current for 2.3× lower noise and integrated LDO regulation-making it the sole viable option for VCO/PLL power in RF systems.
Availability
LTC1682CMS8-5#PBF is available at Aetrix Electronics and suitable for cellular transceivers, wireless PCMCIA cards, portable medical instruments, and remote transmitters requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1682CMS8-5#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, manufacturing, and documentation for the LTC portfolio.
The LTC1682CMS8-5#PBF belongs to Linear's precision power management family, engineered specifically for RF and wireless applications demanding ultra-low-noise, inductorless voltage boosting with integrated regulation.
FAQ
What is the exact output voltage tolerance of the LTC1682CMS8-5#PBF over temperature?
The LTC1682CMS8-5#PBF delivers 4.9V to 5.1V output voltage at 1mA load across the full –40°C to 85°C industrial temperature range, as specified in the Electrical Characteristics table. This ±2% tolerance is achieved via laser-trimmed internal resistor networks and a 1.235V bandgap reference with ±50ppm/°C temperature coefficient.
Can the LTC1682CMS8-5#PBF be used with input voltages below 2.7V?
No-the LTC1682CMS8-5#PBF is not characterized or guaranteed for operation below 2.7V input. At VIN < 2.7V, the internal LDO may fail to regulate 5V output due to insufficient CPO headroom (CPO ≈ 2×VIN), and the device may enter dropout or fail to start. For 1.8V–2.6V inputs, the adjustable LTC1682CMS8 or LTC1682CMS8-3.3 variants are appropriate.
Why does the LTC1682CMS8-5#PBF require a 1nF capacitor on the FILT pin?
The FILT pin on the LTC1682CMS8-5#PBF connects to the internal voltage reference node. A 1nF capacitor to ground filters high-frequency noise coupling into the reference, directly reducing output voltage noise. Omitting this capacitor increases measured VOUT noise by ~20–30%, degrading phase noise performance in VCO applications powered by the LTC1682CMS8-5#PBF.
Is the LTC1682CMS8-5#PBF pin-compatible with the LTC1682CMS8-3.3#PBF?
Yes-the LTC1682CMS8-5#PBF and LTC1682CMS8-3.3#PBF share identical MSOP-8 pinouts and package dimensions. However, Pin 3 functions as FILT in both parts (not FB), and the internal feedback network is trimmed for 3.3V or 5V respectively; they are not functionally interchangeable without redesigning the output voltage requirement.
How does thermal shutdown behave in the LTC1682CMS8-5#PBF during sustained overload?
When junction temperature exceeds 150°C, the LTC1682CMS8-5#PBF disables the LDO and charge pump, dropping VOUT and reducing power dissipation. It automatically re-enables once the die cools to ~140°C. Under continuous overload, this causes thermal cycling-visible as periodic VOUT dropouts-protecting the device but indicating inadequate heatsinking or excessive load current beyond the 50mA design limit.
LTC1682CMS8-5#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
- 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):
- 5V
- 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
LTC1682CMS8-5#PBF FAQ
1.How can I place an order for LTC1682CMS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682CMS8-5#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 LTC1682CMS8-5#PBF reliable?
The price and inventory of LTC1682CMS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682CMS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1682CMS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682CMS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682CMS8-5#PBF?
LTC1682CMS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682CMS8-5#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 LTC1682CMS8-5#PBF?
For technical support, including LTC1682CMS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682CMS8-5#PBF requirements.
6.How does Aetrix verify that LTC1682CMS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1682CMS8-5#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 LTC1682CMS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1682CMS8-5#PBF?
All LTC1682CMS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682CMS8-5#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 LTC1682CMS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1682CMS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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