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Analog Devices Inc. LTC1682CMS8#TRPBF
- Part No.:
- LTC1682CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1682CMS8#TRPBF.pdf
- Description:
- IC REG CHARG PUMP ADJ 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,722
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Product details
Overview
LTC1682CMS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, low-noise dual-stage power management IC combining a 550kHz switched-capacitor voltage doubler charge pump and an integrated low-dropout linear regulator. It delivers up to 50mA regulated output with 64µVRMS noise (10Hz–100kHz), fixed 3.3V output, 1.8V–4.4V input range, and 1µA shutdown current - designed specifically for powering noise-sensitive VCOs in cellular RF front-ends.
For engineers reviewing the LTC1682CMS8#TRPBF datasheet, LTC1682CMS8#TRPBF pinout, LTC1682CMS8#TRPBF application, or LTC1682CMS8#TRPBF equivalent, key selection criteria include its ultra-low output noise floor, absence of inductors, MSOP-8 package compatibility with high-density RF layouts, and thermal/short-circuit protection for robust operation in portable wireless transceivers.
Technical Context
The LTC1682CMS8#TRPBF implements a two-stage architecture: first, a precision 550kHz doubler charge pump generates ~2×VIN at CPO; second, an internal LDO filters ripple and regulates to a fixed 3.3V output with 75mV dropout at 10mA. Its Burst Mode operation activates below 100µA load to reduce quiescent current to 150µA while maintaining regulation.
Pin 3 functions as FILT (not FB), accepting a 1nF capacitor to filter the internal 1.235V reference - critical for achieving ≤64µVRMS noise. The device incorporates thermal shutdown (>150°C), current limiting, and a 100Ω VOUT-to-GND discharge switch during shutdown, enabling clean power sequencing in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over full temperature range - eliminates external feedback resistors and ensures stable bias for VCOs requiring precise tuning voltage. |
| Output Noise | 64µVRMS (10Hz–100kHz), 600µVP-P (10Hz–2.5MHz) - enables direct powering of high-frequency VCOs without additional filtering. |
| Input Range | 1.8V to 4.4V - supports single-cell Li-ion (3.0–4.2V), NiMH (2.4–3.6V), and 3.3V logic rails without intermediate regulation. |
| Max Output Current | 50mA continuous - sufficient for biasing multiple VCOs or low-power RF synthesizers in compact handheld devices. |
| Shutdown Current | 1µA typical - preserves battery life in sleep modes of pagers, PCMCIA cards, and remote transmitters. |
| Switching Frequency | 550kHz ±7% - places switching energy beyond sensitive IF bands and simplifies EMI filtering with small ceramic capacitors. |
| Package | 8-pin MSOP (3mm × 3mm, 0.65mm pitch) - provides thermal performance (θJA = 140°C/W) and layout density required for RF modules. |
Pinout & Package
8-pin MSOP package with exposed pad (not electrically connected); 3mm × 3mm body, 0.65mm lead pitch, 1.1mm max height. Requires minimum 2µF low-ESR ceramic capacitor on VOUT and CPO for stability and noise suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | Fixed 3.3V supply rail; must be bypassed with ≥2µF low-ESR ceramic capacitor placed adjacent to pin for optimal noise rejection. |
| SHDN (Pin 2) | Enable control input | Active-high logic input; <0.4V disables device, connecting VOUT to GND via 100Ω switch and reducing IIN to 1µA. |
| FILT (Pin 3) | Reference filter node | High-impedance connection for 1nF capacitor to ground - essential for achieving specified 64µVRMS output noise performance. |
| GND (Pin 4) | Power and signal reference | Main thermal path; requires direct connection to large PCB copper area to maintain TJ ≤125°C under 50mA load. |
| C– (Pin 5) | Flying capacitor negative terminal | Connects to 0.22µF ceramic flying capacitor; low-ESR requirement minimizes charge transfer losses and switching spikes. |
| VIN (Pin 6) | Main input supply | Accepts 1.8V–4.4V; requires ≥2µF low-ESR ceramic bypass capacitor near pin to suppress input ripple from charge pump transients. |
| C+ (Pin 7) | Flying capacitor positive terminal | Completes charge pump topology with C–; must use same 0.22µF ceramic capacitor as C– for balanced operation. |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate rail; bypassed with ≥2µF low-ESR capacitor - value impacts VOUT enable time and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI, enabling compact RF module designs with minimal board area. |
| Integrated LDO post-regulation | Reduces CPO ripple by >40dB, delivering clean 3.3V output without external LDO or ferrite beads. |
| Burst Mode efficiency optimization | Reduces operating current to 150µA at light loads while maintaining regulation - extends battery runtime in intermittent-use devices. |
| Thermal and short-circuit protection | Auto-recovers from overload conditions without latch-up; allows indefinite VOUT short to ground without damage. |
| MSOP-8 RF-optimized layout | Small footprint and thermal pad-compatible design supports dense placement near VCOs with minimal trace inductance. |
Applications
| Cellular Phone VCO Power Supply | 2-Way Pager RF Transmitter |
|---|---|
Use Scenario: Providing clean 3.3V bias to voltage-controlled oscillators in GSM/EDGE handset front-ends operating from single Li-ion cells. IC Role / Device Role / Timing Role: Primary low-noise power source for VCO tuning voltage - directly determines phase noise and spectral purity. Use Value: 64µVRMS noise ensures <−140dBc/Hz close-in phase noise at 902MHz, meeting cellular spectral mask requirements. |
Use Scenario: Powering narrowband FM transmitters in compact two-way messaging devices with tight battery life constraints. IC Role / Device Role / Timing Role: Regulated supply for oscillator and buffer stages - maintains frequency stability across temperature and battery discharge. Use Value: 1µA shutdown current extends standby time to >1 year on standard AA batteries while enabling instant wake-up. |
| Wireless PCMCIA Card Synthesizer | Portable Medical Telemetry Transmitter |
Use Scenario: Generating stable local oscillator voltage in laptop-insertable 802.11b/Bluetooth combo cards with space-constrained PCBs. IC Role / Device Role / Timing Role: Low-noise auxiliary supply for fractional-N PLL charge pumps and VCOs - reduces spurious emissions. Use Value: MSOP-8 package and ceramic-only design eliminate inductor height and EMI coupling issues in thin card form factors. |
Use Scenario: Biasing RF transmitter ICs in wearable ECG or glucose monitor telemetry units requiring FDA-compliant low-power operation. IC Role / Device Role / Timing Role: Isolated, low-noise power domain for wireless transmission circuitry - prevents analog sensor interference. Use Value: Internal thermal shutdown and short-circuit protection ensure fail-safe operation during patient-contact scenarios. |
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 |
|---|---|---|---|
| LTC1682IMS8-3.3 | Same silicon, extended –40°C to 85°C industrial temperature grade; identical electrical specs and pinout. | Required for automotive cabin modules or industrial telemetry where ambient exceeds 70°C. | Select when operating temperature exceeds commercial range; no design changes needed. |
| LT3467EDD-3.3 | Higher 100mA output, but uses inductor-based boost + LDO; 120µVRMS noise - 1.9× higher than LTC1682CMS8#TRPBF. | Suitable for higher-current RF power amplifiers, not VCOs demanding ultra-low phase noise. | Choose only if >50mA load or wider input range (1.5V–10V) is required; accept higher noise and inductor footprint. |
Compared with LTC1682IMS8-3.3, the LTC1682CMS8#TRPBF offers identical performance at lower cost for commercial-temperature applications; versus LT3467EDD-3.3, it trades current capability for superior noise performance and inductor-free layout - making it the optimal choice for VCO bias where phase noise dominates system specifications.
Availability
LTC1682CMS8#TRPBF is available at Aetrix Electronics and suitable for cellular phone RF modules, 2-way pager transmitters, wireless PCMCIA cards, portable medical telemetry, and remote sensor transmitters requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1682CMS8#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 full product support, documentation, and manufacturing continuity for all Linear legacy parts including the LTC1682 family.
The LTC1682 series was developed specifically for RF power management - integrating charge pump and LDO in one die to solve noise, size, and efficiency challenges in battery-powered wireless transceivers.
FAQ
What is the maximum output current capability of the LTC1682CMS8#TRPBF?
The LTC1682CMS8#TRPBF delivers up to 50mA of continuous regulated output current at 3.3V while maintaining specified line/load regulation and thermal safety. At higher currents, the internal LDO enters dropout or triggers thermal shutdown - actual usable current depends on input voltage, ambient temperature, and PCB copper area. For sustained 50mA operation, VIN ≥2.7V and θJA ≤140°C/W are required.
Does the LTC1682CMS8#TRPBF require external feedback resistors to set its output voltage?
No. The LTC1682CMS8#TRPBF is the fixed 3.3V version - Pin 3 is labeled FILT and accepts a 1nF capacitor to ground for reference filtering. Unlike the adjustable LTC1682 variant, it contains internal resistor networks that set VOUT to 3.3V ±3%, eliminating external feedback components and simplifying layout for RF-sensitive applications.
How does the LTC1682CMS8#TRPBF achieve its ultra-low 64µVRMS output noise?
The LTC1682CMS8#TRPBF achieves 64µVRMS noise through three integrated techniques: (1) a low-noise bandgap reference filtered via the FILT pin, (2) an LDO stage with high PSRR that attenuates CPO ripple, and (3) controlled switch edge rates in the 550kHz charge pump. Using a 1nF capacitor on FILT and ≥2µF low-ESR ceramics on VOUT/CPO is mandatory to realize this specification.
Can the LTC1682CMS8#TRPBF operate from a 1.8V input supply?
Yes. The LTC1682CMS8#TRPBF operates across 1.8V to 4.4V input - at 1.8V, it generates ~3.5V at CPO, which the LDO regulates to 3.3V with 75mV dropout. However, output current is reduced at low VIN due to CPO headroom limitations; maximum load at 1.8V is ~20mA. Full 50mA capability requires VIN ≥2.7V.
What protection features are built into the LTC1682CMS8#TRPBF?
The LTC1682CMS8#TRPBF includes internal thermal shutdown (trips at >150°C, recovers at <140°C), output current limiting, and indefinite VOUT short-circuit tolerance. During shutdown, a 100Ω switch connects VOUT to GND to discharge external capacitance. These protections operate without external components and are fully characterized across the commercial temperature range.
LTC1682CMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1682CMS8#TRPBF FAQ
1.How can I place an order for LTC1682CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682CMS8#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 LTC1682CMS8#TRPBF reliable?
The price and inventory of LTC1682CMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682CMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1682CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682CMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682CMS8#TRPBF?
LTC1682CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682CMS8#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 LTC1682CMS8#TRPBF?
For technical support, including LTC1682CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682CMS8#TRPBF requirements.
6.How does Aetrix verify that LTC1682CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1682CMS8#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 LTC1682CMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1682CMS8#TRPBF?
All LTC1682CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682CMS8#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 LTC1682CMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1682CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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