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Analog Devices Inc. LTC1682CS8-5#PBF
- Part No.:
- LTC1682CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1682CS8-5#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:220
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Product details
Overview
LTC1682CS8-5#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 cellular handsets and wireless modules. It operates from 2.7V–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 LTC1682CS8-5#PBF datasheet, LTC1682CS8-5#PBF pinout, LTC1682CS8-5#PBF application, or LTC1682CS8-5#PBF equivalent, key selection criteria include its fixed 5V regulated output, 550kHz switching frequency, thermal/short-circuit protection, MSOP/SO-8 package compatibility, and suitability for low-phase-noise RF supply rails where ripple rejection and startup behavior are critical.
Technical Context
The LTC1682CS8-5#PBF integrates a switched-capacitor voltage doubler followed by a low-dropout linear regulator. The charge pump generates ~2×VIN at CPO, which powers the LDO stage; the LDO then provides a tightly regulated, low-noise 5V output independent of CPO ripple. Its internal 1.235V reference and trimmed 550kHz oscillator ensure stable operation across temperature and load.
Burst Mode activates below 100µA load to improve efficiency, while continuous switching maintains lowest noise. Internal comparators monitor CPO (1.45×VIN disable threshold, 1.75×VIN enable threshold) to prevent LDO dropout and preserve noise performance. Shutdown disconnects VOUT via a 100Ω switch and reduces quiescent current to 1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±100mV (guaranteed over full temp range; enables direct replacement of 5V LDOs without feedback resistors) |
| Output Noise | 64µVRMS (10Hz–100kHz); 600µVP-P (10Hz–2.5MHz) - meets stringent VCO supply requirements for close-in phase noise |
| Input Voltage Range | 2.7V to 4.4V - supports Li-ion battery discharge profile and 3.3V system rails |
| Max Output Current | 50mA - sufficient for biasing VCOs, PLLs, and low-power RF front-ends |
| Switching Frequency | 550kHz (typical), 480–620kHz (min/max) - high enough to avoid audio band, low enough for efficient ceramic capacitor use |
| Quiescent Current | 150µA (typical, no load) - enables always-on low-power RF subsystems |
| Shutdown Current | 1µA (max) - preserves battery life during sleep modes |
| Dropout Voltage | 90mV (max at 10mA) - ensures regulation even at end-of-battery voltage (e.g., 3.3V input → 5V output requires ≥3.59V CPO) |
Pinout & Package
Package: 8-pin SO (Small Outline, narrow 0.150"), RoHS-compliant, lead-free (Pb-free) #PBF suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated 5V output | Low-noise power rail; requires ≥2µF low-ESR ceramic capacitor directly at pin for stability and transient response |
| SHDN (Pin 2) | Active-low shutdown control | Logic-compatible input; pulls VOUT to ground via 100Ω switch when low; connect to VIN for permanent enable |
| FILT (Pin 3) | Reference filter node | High-impedance node requiring 1nF capacitor to ground for optimal noise suppression (not FB - no external divider needed) |
| GND (Pin 4) | System ground reference | Main thermal and noise return path; must be connected to large copper pour for heat dissipation and low-impedance grounding |
| C– (Pin 5) | Flying capacitor negative terminal | Connects to negative side of 0.22µF ceramic flying capacitor; layout symmetry critical for charge pump efficiency |
| VIN (Pin 6) | Main input supply | Accepts 2.7V–4.4V; bypass with ≥2µF low-ESR capacitor near pin to suppress input ripple and supply transients |
| C+ (Pin 7) | Flying capacitor positive terminal | Connects to positive side of 0.22µF flying capacitor; paired with C– to form charge transfer path |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate rail; requires ≥2µF low-ESR capacitor; drives internal LDO and may power auxiliary circuits |
Key Features
| Feature | Design Value |
|---|---|
| Integrated doubler + LDO architecture | Eliminates need for external inductors and separate regulators - reduces BOM count and PCB area in space-constrained RF modules |
| 64µVRMS output noise | Enables direct powering of VCOs without additional filtering, minimizing phase noise degradation in 900MHz/2.4GHz transceivers |
| Internal 1.235V reference & 550kHz oscillator | Factory-trimmed for accuracy and stability - avoids external timing components and reference calibration |
| Thermal and short-circuit protection | Auto-shutdown at >150°C junction temperature with hysteresis (re-enable at <140°C); allows indefinite VOUT short to ground |
| 100Ω VOUT discharge switch | Ensures rapid VOUT ramp-down during shutdown - prevents floating supply conditions in multi-rail systems |
| 2.7V–4.4V input range with 50mA capability | Supports single-cell Li-ion (2.7–4.2V) and regulated 3.3V supplies - simplifies power architecture in portable wireless devices |
Applications
| Cellular Handset VCO Supply | Wireless PCMCIA Card Power |
|---|---|
Use Scenario: Providing clean 5V bias to voltage-controlled oscillators in GSM/EDGE handset front-ends operating from a single Li-ion cell. IC Role / Device Role / Timing Role: Primary low-noise regulated supply for VCO core - replaces discrete charge pump + LDO solutions. Use Value: 64µVRMS noise and 550kHz switching minimize close-in phase noise (e.g., –120dBc/Hz at 1kHz offset), directly improving EVM and adjacent channel leakage. | Use Scenario: Generating stable 5V rail for RF transceivers and baseband processors in legacy laptop PCMCIA wireless adapters. IC Role / Device Role / Timing Role: Compact, inductorless boost-LDO converter enabling hot-plug compliance and minimal board real estate usage. Use Value: 50mA output and 2.7V minimum input allow operation across full battery discharge curve; SO-8 package fits standard PCMCIA layout constraints. |
| Portable Medical Instrument Sensor Bias | Remote ISM-Band Transmitter |
Use Scenario: Powering ultra-low-noise analog front-ends (e.g., EEG/ECG amplifiers) requiring isolated, ripple-free 5V bias in battery-operated diagnostic tools. IC Role / Device Role / Timing Role: Low-drift, low-noise auxiliary supply - decouples sensitive analog circuitry from noisy digital domains. Use Value: 64µVRMS noise and <50ppm/°C VOUT drift ensure signal integrity; 1µA shutdown current extends battery life between measurements. | Use Scenario: Supplying 5V to sub-GHz (e.g., 868/915MHz) ISM-band transmitters in battery-powered remote sensors and telemetry nodes. IC Role / Device Role / Timing Role: Efficient, compact DC-DC solution replacing inefficient linear regulators or bulky inductive converters. Use Value: 150µA quiescent current and Burst Mode operation extend 10-year battery life; SO-8 package withstands industrial reflow profiles. |
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 |
|---|---|---|---|
| LTC1682IMS8-5 | Same electrical specs but rated for –40°C to 85°C industrial temperature range; identical pinout and footprint | Suitable for automotive under-hood or industrial outdoor deployments where extended temperature operation is mandatory | Select LTC1682IMS8-5 when ambient operating temperature exceeds 70°C or requires guaranteed performance across –40°C to 85°C |
| LT1761ES5-5#TRPBF | 100mA LDO only (no charge pump); 20µVRMS noise; requires ≥4.5V input for 5V output - no boosting capability | Applicable only when input voltage ≥4.5V; cannot replace LTC1682CS8-5#PBF in 3.3V or battery-powered systems needing voltage boost | Choose LT1761ES5-5#TRPBF only if input rail is stable ≥4.5V and higher output current (100mA) or lower noise (20µVRMS) is prioritized over input flexibility |
Compared with LTC1682IMS8-5, the LTC1682CS8-5#PBF offers identical functionality at lower cost for commercial-temperature applications; versus LT1761ES5-5#TRPBF, it uniquely enables 5V output from inputs as low as 2.7V - essential for battery-powered RF systems where input headroom is constrained.
Availability
LTC1682CS8-5#PBF is available at Aetrix Electronics and suitable for cellular handset design, wireless PCMCIA card development, portable medical instrumentation, and remote ISM-band transmitter applications requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for LTC1682CS8-5#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, datasheets, and application engineering for the LTC portfolio. Linear was renowned for precision analog and power management ICs targeting high-performance signal chains and power-efficient systems.
The LTC1682CS8-5#PBF belongs to Linear's low-noise power management family, specifically engineered to address RF supply challenges in wireless infrastructure and portable communications - emphasizing noise suppression, small-footprint integration, and battery-friendly efficiency.
FAQ
What is the guaranteed output voltage tolerance for LTC1682CS8-5#PBF across temperature and load?
The LTC1682CS8-5#PBF guarantees a regulated 5.0V output with ±100mV tolerance (4.90V to 5.10V) over the full commercial temperature range (0°C to 70°C) and for output currents from 1mA to 50mA, as specified in the Electrical Characteristics table under "Regulated Output Voltage" with G-grade testing.
Can LTC1682CS8-5#PBF operate from a 2.5V input supply?
No - the LTC1682CS8-5#PBF has a minimum input voltage specification of 2.7V per the Electrical Characteristics table. Operation below 2.7V violates absolute maximum ratings and risks failure to regulate or start up reliably; for 2.5V input, consider the adjustable LTC1682CS8 or LTC1682CMS8 variants.
Is an external feedback resistor network required for LTC1682CS8-5#PBF?
No - the LTC1682CS8-5#PBF uses an internal resistor divider to set its fixed 5V output. Pin 3 is labeled FILT (not FB) and requires only a 1nF capacitor to ground for optimal noise performance; no external resistors are needed or supported for output voltage adjustment.
How does the shutdown function behave on LTC1682CS8-5#PBF?
When SHDN (Pin 2) is pulled below 0.4V, the LTC1682CS8-5#PBF enters shutdown: supply current drops to ≤1µA, the internal LDO disables, CPO becomes high-impedance, and VOUT is actively discharged to ground through a 100Ω internal switch - ensuring rapid, controlled rail collapse without external circuitry.
What capacitor values are mandatory for stable operation of LTC1682CS8-5#PBF?
For stable operation, LTC1682CS8-5#PBF requires: (1) 0.22µF ceramic flying capacitor between C+ (Pin 7) and C– (Pin 5); (2) ≥2µF low-ESR ceramic capacitor on VOUT (Pin 1); (3) ≥2µF low-ESR ceramic capacitor on CPO (Pin 8); and (4) 1nF capacitor from FILT (Pin 3) to ground. Input VIN (Pin 6) also requires ≥2µF bypass capacitance.
LTC1682CS8-5#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
- 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-SO
LTC1682CS8-5#PBF FAQ
1.How can I place an order for LTC1682CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682CS8-5#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 LTC1682CS8-5#PBF reliable?
The price and inventory of LTC1682CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1682CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682CS8-5#PBF?
LTC1682CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682CS8-5#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 LTC1682CS8-5#PBF?
For technical support, including LTC1682CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682CS8-5#PBF requirements.
6.How does Aetrix verify that LTC1682CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1682CS8-5#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 LTC1682CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1682CS8-5#PBF?
All LTC1682CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682CS8-5#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 LTC1682CS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1682CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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