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Analog Devices Inc. LTC1682IS8-5#TRPBF
- Part No.:
- LTC1682IS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1682IS8-5#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,198
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Product details
Overview
LTC1682IS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V 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 operates from 2.7V–4.4V input, delivers up to 50mA output current, features 64µVRMS output noise (10Hz–100kHz), and uses only ceramic capacitors-no inductors required.
For engineers reviewing the LTC1682IS8-5#TRPBF datasheet, LTC1682IS8-5#TRPBF pinout, LTC1682IS8-5#TRPBF application, or LTC1682IS8-5#TRPBF equivalent, key selection criteria include its guaranteed 5V ±1% output over –40°C to +85°C, 550kHz switching frequency, 1µA shutdown current, thermal/short-circuit protection, and compatibility with standard 8-pin SO package layouts.
Technical Context
The LTC1682IS8-5#TRPBF 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 that filters ripple and regulates precisely to 5V. Its Burst Mode operation activates below 100µA load to reduce quiescent current while maintaining regulation.
Internal protection includes thermal shutdown (trip at 150°C, restart at 140°C), current limiting, and LDO disable logic triggered 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 ±1% (3.23V–3.37V for -3.3 variant; this part is -5) |
| Input Voltage Range | 2.7V to 4.4V - ensures stable operation across Li-ion battery discharge curve |
| Output Noise | 64µVRMS (10Hz–100kHz) - enables clean VCO biasing without phase noise degradation |
| Max Output Current | 50mA - sufficient for RF synthesizers and low-power transceivers |
| Shutdown Current | 1µA - supports ultra-low-power sleep modes in portable devices |
| Switching Frequency | 550kHz - avoids AM radio band interference and simplifies EMI filtering |
| Package | 8-pin SO (Small Outline) - industry-standard footprint, compatible with automated assembly |
Pinout & Package
Package: 8-pin plastic SO (narrow, 0.150" width), RoHS-compliant, rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | 5V low-noise supply rail; requires ≥2µF low-ESR ceramic capacitor for stability and transient response |
| SHDN (Pin 2) | Enable control input | Logic-high (>1.6V) enables device; logic-low (<0.4V) disables regulator and discharges VOUT via 100Ω switch |
| FILT (Pin 3) | Reference filter node | Connects to 1nF capacitor to ground to minimize reference noise and improve output voltage accuracy |
| GND (Pin 4) | Power and signal reference | Main system ground return; must be connected to large copper pour for thermal dissipation and noise reduction |
| 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 | 2.7V–4.4V supply; bypassed with ≥2µF low-ESR capacitor near pin to suppress input ripple |
| C+ (Pin 7) | Flying capacitor positive terminal | Completes charge transfer path; paired with C– to form flying capacitor network |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate rail; bypassed with ≥2µF low-ESR capacitor; drives internal LDO |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI, enabling compact PCB layout in space-constrained RF modules |
| Integrated thermal/short-circuit protection | Prevents damage during fault conditions; automatic recovery after junction cools below 140°C |
| Low 64µVRMS output noise | Meets stringent phase noise requirements for 900MHz/1.8GHz VCOs without external LDO post-regulation |
| 1µA shutdown current | Extends battery life in always-on wireless sensors and pager applications |
| Stable with 2µF output capacitor | Reduces BOM count and board area vs. traditional LDOs requiring larger capacitance |
Applications
| Cellular Handset VCO Supply | Wireless PCMCIA Card Power |
|---|---|
Use Scenario: Providing ultra-low-noise 5V bias to voltage-controlled oscillators in GSM/EDGE front-end modules. IC Role / Device Role / Timing Role: Primary regulated supply for VCO core, replacing discrete charge pump + LDO solutions. Use Value: 64µVRMS noise prevents close-in phase noise degradation, directly improving adjacent channel power ratio (ACPR). | Use Scenario: Generating clean 5V rail for RF transceivers embedded in laptop PCMCIA wireless adapters. IC Role / Device Role / Timing Role: Standalone boost-and-regulate power source for 2.4GHz ISM-band transceivers. Use Value: 550kHz switching frequency avoids interference with USB 2.0 signaling and PCIe reference clocks on shared motherboards. |
| Portable Medical Instrument Sensor Bias | Remote Transmitter RF Stage |
Use Scenario: Powering low-noise analog front-ends in handheld ECG or pulse oximetry units. IC Role / Device Role / Timing Role: Low-quiescent, low-noise auxiliary supply for precision ADC drivers and op-amps. Use Value: 1µA shutdown current extends operating time between battery charges in battery-powered diagnostic tools. | Use Scenario: Supplying stable 5V to UHF transmitter ICs in remote sensor telemetry nodes. IC Role / Device Role / Timing Role: Primary DC-DC converter for RF power amplifier biasing in low-duty-cycle IoT transmitters. Use Value: Wide 2.7V–4.4V input range accommodates aging alkaline or NiMH batteries without brownout during transmission bursts. |
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 |
|---|---|---|---|
| LTC1682IS8-3.3#TRPBF | Fixed 3.3V output; identical pinout, package, and noise performance (58µVRMS) | Used where 3.3V logic or RF ICs require lower headroom than 5V | Select when system-level voltage rails mandate 3.3V instead of 5V; no layout change needed |
| LT1761ES5-5#TRPBF | LDO-only (no charge pump); 20µVRMS noise but requires ≥2.7V input - cannot boost | Suitable only if input voltage ≥5V; lacks voltage doubling capability | Choose only when VIN ≥5V is available; otherwise LTC1682IS8-5#TRPBF is necessary for step-up functionality |
Compared with LTC1682IS8-3.3#TRPBF, the LTC1682IS8-5#TRPBF provides higher output voltage for legacy 5V RF components, while LT1761ES5-5#TRPBF offers lower noise but cannot operate from single-cell Li-ion or 3.3V sources - making LTC1682IS8-5#TRPBF uniquely suited for battery-powered 5V RF biasing.
Availability
LTC1682IS8-5#TRPBF is available at Aetrix Electronics and suitable for cellular handset design, wireless PCMCIA card development, and portable medical instrumentation requiring stable component supply with full industrial temperature support (–40°C to +85°C).
Supply support for LTC1682IS8-5#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 its high-performance analog product lines. Linear pioneered precision power management ICs for demanding RF and instrumentation applications.
The LTC1682 family was designed specifically to replace discrete charge pump + LDO combinations in noise-critical RF power supplies, targeting cellular infrastructure, portable communications, and medical sensing equipment.
FAQ
What is the guaranteed output voltage tolerance for LTC1682IS8-5#TRPBF over temperature?
The LTC1682IS8-5#TRPBF guarantees a regulated 5.0V output with ±1% tolerance (4.9V to 5.1V) across the full –40°C to +85°C industrial temperature range, as confirmed in the Electrical Characteristics table under "Regulated Output Voltage" with condition IOUT = 1mA and G-grade specification marking.
Can LTC1682IS8-5#TRPBF operate from a single 3.3V supply?
Yes, LTC1682IS8-5#TRPBF operates from 2.7V to 4.4V input, making it fully compatible with a nominal 3.3V supply. At VIN = 3.3V, the charge pump generates ~6.6V at CPO, allowing the LDO to maintain 5.0V output with margin even under 50mA load and worst-case dropout (90mV).
Why does LTC1682IS8-5#TRPBF require a 1nF capacitor on Pin 3 (FILT)?
LTC1682IS8-5#TRPBF uses Pin 3 as FILT to filter the internal 1.235V reference voltage. A 1nF capacitor to ground minimizes high-frequency noise coupling into the reference, ensuring output voltage accuracy and reducing output noise to the specified 64µVRMS - omitting it degrades noise performance by up to 30%.
Is LTC1682IS8-5#TRPBF pin-compatible with LTC1682CS8-5?
Yes, LTC1682IS8-5#TRPBF and LTC1682CS8-5 share identical 8-pin SO package dimensions and pinout. The only difference is temperature grade: IS8-5 is industrial (–40°C to +85°C), while CS8-5 is commercial (0°C to +70°C); both use same marking (16825) and footprint.
What protection features are built into LTC1682IS8-5#TRPBF?
LTC1682IS8-5#TRPBF includes internal thermal shutdown (trips at 150°C, auto-restarts at 140°C), output short-circuit current limiting, and LDO disable logic that disconnects VOUT from CPO if CPO drops below 1.45×VIN - preventing unregulated ripple from appearing at VOUT during low-input or overload conditions.
LTC1682IS8-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1682IS8-5#TRPBF FAQ
1.How can I place an order for LTC1682IS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682IS8-5#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 LTC1682IS8-5#TRPBF reliable?
The price and inventory of LTC1682IS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682IS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1682IS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682IS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682IS8-5#TRPBF?
LTC1682IS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682IS8-5#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 LTC1682IS8-5#TRPBF?
For technical support, including LTC1682IS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682IS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC1682IS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1682IS8-5#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 LTC1682IS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1682IS8-5#TRPBF?
All LTC1682IS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682IS8-5#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 LTC1682IS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1682IS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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