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Analog Devices Inc. LTC1682CS8#TRPBF
- Part No.:
- LTC1682CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1682CS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ 50MA 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1682CS8#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-output 3.3V doubler charge pump with integrated low-noise LDO regulator, designed for powering noise-sensitive RF circuitry such as VCOs in cellular handsets and wireless PCMCIA cards. It operates from 2.0V to 4.4V input, delivers up to 50mA output current, features 58µVRMS output noise (10Hz–100kHz), and uses only ceramic capacitors-no inductors required.
For engineers reviewing the LTC1682CS8#TRPBF datasheet, LTC1682CS8#TRPBF pinout, LTC1682CS8#TRPBF application, or LTC1682CS8#TRPBF equivalent, key selection criteria include its 3.3V fixed regulated output, 550kHz switching frequency, 1µA shutdown current, MSOP-8/SO-8 package compatibility, and suitability for low-phase-noise RF power supply designs where inductor-free layout and <60µVRMS noise are critical.
Technical Context
The LTC1682CS8#TRPBF 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 an internal LDO that filters ripple and regulates to a precise 3.3V output. Its Burst Mode operation reduces quiescent current to 150µA under light loads while maintaining low noise via controlled edge rates and optimized capacitor sizing.
Internal protection includes thermal shutdown at 150°C, current limiting, and automatic LDO disable when CPO falls below 1.45×VIN. The device is stable with ≥2µF ceramic output capacitance and requires only a 0.22µF flying capacitor-enabling compact, inductorless PCB layouts ideal for space-constrained portable RF systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.23V–3.37V) over full temperature range-ensures stable bias for VCOs without external feedback components. |
| Output Noise | 58µVRMS (10Hz–100kHz); 500µVP-P (10Hz–2.5MHz)-meets stringent phase noise requirements for 900MHz/1.8GHz RF synthesizers. |
| Input Voltage Range | 2.0V to 4.4V-supports direct connection to Li-ion battery (3.0–4.2V) or regulated 3.3V/2.5V rails without pre-regulation. |
| Max Output Current | 50mA continuous-sufficient for biasing high-frequency VCOs, PLLs, and low-power RF front-end ICs. |
| Shutdown Current | 1µA typical-enables ultra-low-power sleep modes in battery-operated wireless devices. |
| Switching Frequency | 550kHz ±7%-high enough to allow small ceramic capacitors, low enough to minimize EMI coupling into adjacent RF sections. |
| Dropout Voltage | 75mV at 10mA load-minimizes power loss and heat generation when VIN approaches 3.3V, extending battery life. |
Pinout & Package
Package: 8-pin SO (Small Outline, narrow 0.150"), RoHS-compliant, surface-mount. Pin pitch: 1.27mm. Body dimensions: 4.90mm × 3.90mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | 3.3V low-noise supply rail; requires ≥2µF low-ESR ceramic capacitor directly at pin for stability and noise suppression. |
| SHDN (Pin 2) | Active-high enable | Logic high (>1.6V) enables regulation; logic low (<0.4V) disables LDO and discharges VOUT to ground via 100Ω switch. |
| FILT (Pin 3) | Reference filter node | Connects to 1nF capacitor to ground to reduce reference noise-critical for achieving specified 58µVRMS output noise. |
| GND (Pin 4) | Power and signal ground | Main thermal path and return for all currents; must connect to large copper pour to manage power dissipation and noise coupling. |
| C– (Pin 5) | Flying capacitor negative | AC-coupled terminal of 0.22µF flying capacitor; forms charge transfer path with C+ during doubler operation. |
| VIN (Pin 6) | Main input supply | Accepts 2.0–4.4V; requires ≥2µF low-ESR bypass capacitor near pin to suppress transient current spikes from charge pump. |
| C+ (Pin 7) | Flying capacitor positive | Second AC-coupled terminal of 0.22µF flying capacitor; alternately charges/discharges with C– to generate doubled voltage at CPO. |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate rail (~6.6V at VIN=3.3V); bypassed with ≥2µF capacitor to minimize ripple before LDO filtering. |
Key Features
| Feature | Design Value |
|---|---|
| Doubler + LDO integration | Eliminates need for external boost converter and post-regulator-reduces BOM count, board area, and design complexity in RF power supplies. |
| No-inductor architecture | Enables fully ceramic, EMI-optimized layout in tight spaces (e.g., mobile phone modules) without magnetic component placement constraints. |
| Low-noise LDO stage | 60µVRMS typical noise floor ensures minimal close-in phase noise degradation in VCO applications-verified at 902MHz center frequency. |
| Thermal and short-circuit protection | Auto-shutdown at 150°C junction temperature and indefinite short-circuit tolerance prevent field failures in unattended portable equipment. |
| Burst Mode efficiency | Reduces operating current to 150µA at light loads while preserving noise performance-ideal for intermittent RF transmit duty cycles. |
Applications
| Cellular Phone VCO Supply | Wireless PCMCIA Card Power |
|---|---|
Use Scenario: Providing clean 3.3V bias to voltage-controlled oscillators in GSM/EDGE handset transceivers. IC Role / Device Role / Timing Role: Low-noise regulated power source for VCO core-directly impacts phase noise, EVM, and spectral mask compliance. Use Value: 58µVRMS noise enables <−130dBc/Hz @ 10kHz offset at 902MHz, meeting 3GPP RF conformance requirements without additional filtering. |
Use Scenario: Generating stable 3.3V supply for RF front-end ICs in laptop wireless LAN (802.11b/g) PCMCIA cards. IC Role / Device Role / Timing Role: Primary RF subsystem power rail-must reject digital noise from host interface and maintain regulation during burst-mode data transmission. Use Value: 1µA shutdown current extends card standby time; 550kHz switching frequency avoids interference with 2.4GHz ISM band operation. |
| 2-Way Pager RF Module | Portable Medical Telemetry Transmitter |
Use Scenario: Powering narrowband FM transmitter VCOs in legacy two-way pagers operating from single-cell alkaline batteries (1.5V–3.0V). IC Role / Device Role / Timing Role: Boost-and-regulate stage converting declining battery voltage to constant 3.3V-maintains oscillator frequency stability across battery discharge curve. Use Value: Wide 2.0–4.4V input range supports operation down to 2.0V battery voltage; 75mV dropout preserves headroom even at end-of-life battery. |
Use Scenario: Supplying low-noise 3.3V to RF transmitter ICs in wearable ECG telemetry units requiring FDA-grade reliability and low EMI. IC Role / Device Role / Timing Role: Safety-critical RF power source-must remain stable during motion-induced supply transients and meet IEC 60601 immunity limits. Use Value: Internal thermal shutdown and short-circuit protection eliminate risk of thermal runaway; ceramic-only design avoids inductor failure modes. |
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 |
|---|---|---|---|
| LTC1682CMS8-3.3 | Same silicon, MSOP-8 package (3.0mm × 3.0mm); 30% smaller footprint than SO-8; identical electrical specs. | Better suited for high-density portable designs where board area is constrained (e.g., smartphone modules). | Select when PCB real estate is premium and thermal management allows MSOP's lower θJA (140°C/W vs SO-8's 120°C/W). |
| LT3008EDC-3.3 | Ultra-low-IQ (3µA) LDO only-no charge pump; requires ≥3.3V input; 20µVRMS noise but no voltage boosting capability. | Only viable if system already provides ≥3.3V input; cannot replace LTC1682CS8#TRPBF in battery-powered 2.5V–3.6V systems. | Choose only for fixed-input, ultra-low-quiescent applications where boosting is unnecessary and noise is paramount. |
Compared with LTC1682CMS8-3.3, the LTC1682CS8#TRPBF offers identical regulation performance in a larger SO-8 package better suited for manual assembly and thermal dissipation in industrial modules; versus LT3008EDC-3.3, it uniquely combines boosting and low-noise regulation-enabling single-stage 2.0V-to-3.3V conversion impossible with standalone LDOs.
Availability
LTC1682CS8#TRPBF is available at Aetrix Electronics and suitable for cellular phone VCO supplies, wireless PCMCIA card power, 2-way pager RF modules, and portable medical telemetry transmitters requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1682CS8#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 parts including the LTC1682 family.
The LTC1682 series was developed specifically for RF power management-targeting noise-sensitive wireless applications where inductor-free, low-phase-noise bias supplies are mandatory for VCO and PLL performance.
FAQ
What is the exact output voltage tolerance of the LTC1682CS8#TRPBF over temperature?
The LTC1682CS8#TRPBF delivers a fixed 3.3V output with guaranteed tolerance of ±3% (3.23V to 3.37V) across the full –40°C to 85°C industrial temperature range. This specification is validated per the Electrical Characteristics table in the official datasheet, with worst-case drift limited to ±50ppm/°C and tested under 1mA load conditions.
Can the LTC1682CS8#TRPBF operate from a 1.8V input supply?
No-the LTC1682CS8#TRPBF is the fixed 3.3V version and requires a minimum input voltage of 2.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. For 1.8V input compatibility, the adjustable LTC1682CS8 (without suffix) must be used with external feedback resistors to set VOUT ≥2.5V.
What capacitor values are mandatory for stable operation of the LTC1682CS8#TRPBF?
The LTC1682CS8#TRPBF requires three mandatory capacitors: a 0.22µF ceramic flying capacitor between C+ and C– pins; a 1nF ceramic capacitor from FILT to GND for optimal noise performance; and ≥2µF low-ESR ceramic capacitor on VOUT. All must be placed within 2mm of their respective pins per layout guidelines in the datasheet.
Does the LTC1682CS8#TRPBF support Burst Mode operation, and how does it affect noise?
Yes-the LTC1682CS8#TRPBF automatically enters Burst Mode when output current drops below ~100µA, reducing quiescent current to 150µA. In this mode, output noise increases slightly (to ~65µVRMS) due to intermittent switching, but remains well below 100µVRMS-still suitable for most VCO applications with moderate duty cycles.
Is the LTC1682CS8#TRPBF pin-compatible with the LTC1682-3.3 variants in SO-8 packages?
Yes-the LTC1682CS8#TRPBF is functionally and pinout-identical to LTC1682CS8-3.3 and LTC1682IS8-3.3 in the SO-8 package. All share identical pin functions (VOUT, SHDN, FILT, GND, C–, VIN, C+, CPO), same marking (168233), and identical thermal and electrical behavior-differing only in temperature grade (C = 0°C–70°C, I = –40°C–85°C).
LTC1682CS8#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/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-SO
LTC1682CS8#TRPBF FAQ
1.How can I place an order for LTC1682CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682CS8#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 LTC1682CS8#TRPBF reliable?
The price and inventory of LTC1682CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1682CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682CS8#TRPBF?
LTC1682CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682CS8#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 LTC1682CS8#TRPBF?
For technical support, including LTC1682CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1682CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1682CS8#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 LTC1682CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1682CS8#TRPBF?
All LTC1682CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682CS8#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 LTC1682CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1682CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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