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Analog Devices Inc. LTC1682IMS8-5#PBF
- Part No.:
- LTC1682IMS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1682IMS8-5#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,472
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Product details
Overview
LTC1682IMS8-5#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, low-noise charge pump doubler with integrated LDO regulator in an 8-pin MSOP package. It accepts 2.7V–4.4V input, delivers up to 50mA regulated output with 64µVRMS noise (10Hz–100kHz), and features internal thermal shutdown, current limiting, and 1µA shutdown current - designed specifically for powering noise-sensitive VCOs in cellular handsets and wireless PCMCIA cards.
For engineers reviewing the LTC1682IMS8-5#PBF datasheet, LTC1682IMS8-5#PBF pinout, LTC1682IMS8-5#PBF application, or LTC1682IMS8-5#PBF equivalent, key selection criteria include its fixed 5V output, 64µVRMS output noise performance, MSOP-8 thermal characteristics (θJA = 140°C/W), and compatibility with ceramic capacitors only - no inductors required.
Technical Context
The LTC1682IMS8-5#PBF integrates a 550kHz switched-capacitor doubler stage followed by a low-dropout linear regulator. Its CPO node generates ~2×VIN, which feeds the LDO; regulation is achieved via internal 1.235V reference and trimmed oscillator. Burst Mode operation engages below 100µA load to reduce quiescent current to 150µA while accepting higher ripple.
Pin 3 functions as FILT (not FB), connecting to a 1nF capacitor for reference filtering. The LDO maintains regulation down to 50mV dropout at 10mA (VOUT = 5V), and stability requires ≥2µF low-ESR ceramic on VOUT and CPO - critical for VCO supply integrity in RF front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% (IOUT = 1mA, –40°C to +85°C) |
| Output Noise | 64µVRMS (10Hz–100kHz, CFILT = 1nF, IOUT = 10mA) |
| Input Voltage Range | 2.7V to 4.4V (guaranteed operation per datasheet Table) |
| Max Output Current | 50mA continuous (thermal-limited; >90mA short-circuit safe) |
| Quiescent Current | 150µA typical (Burst Mode active, no load, –40°C to +85°C) |
| Shutdown Current | 1µA typical (SHDN = 0V, full temperature range) |
| Switching Frequency | 550kHz ±70kHz (temperature-stable, no external timing components) |
| Dropout Voltage | 50mV typical (at 10mA, VOUT = 5V; enables high efficiency at low VIN–VOUT delta) |
Pinout & Package
Package: 8-pin MSOP (0.118" width, 140°C/W θJA), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | 5V low-noise supply; requires ≥2µF low-ESR ceramic bypass close to pin |
| SHDN (Pin 2) | Enable control input | Logic-high (>1.6V) enables device; logic-low (<0.4V) discharges VOUT via 100Ω switch and reduces IIN to 1µA |
| FILT (Pin 3) | Reference filter node | Connects to 1nF capacitor to ground for optimal noise reduction of internal 1.235V bandgap reference |
| GND (Pin 4) | Power and signal return | Main thermal path; must connect to large copper pour for thermal management |
| C– (Pin 5) | Flying capacitor negative | AC-coupled terminal for 0.22µF ceramic flying capacitor (C1) |
| VIN (Pin 6) | Main power input | 2.7V–4.4V supply; requires ≥2µF low-ESR ceramic bypass; minimum 0.1µF mandatory |
| C+ (Pin 7) | Flying capacitor positive | AC-coupled terminal completing charge pump doubler topology with C– |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate rail; requires ≥2µF low-ESR ceramic; drives internal LDO |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Enables compact, EMI-optimized layouts using only ceramic capacitors - eliminates magnetic field coupling into RF circuits |
| Integrated LDO filtering | Reduces CPO switching ripple by >40dB before delivery to VOUT, enabling direct VCO bias without additional LC filtering |
| Thermal & short-circuit protection | Auto-shutdown at TJ > 150°C and current limiting ensure robustness in portable battery-powered systems |
| Low-noise FILT pin | 1nF reference bypass reduces voltage reference noise contribution, directly enabling <64µVRMS system-level output noise |
| Burst Mode efficiency | Maintains 150µA IQ at light loads while preserving 550kHz base frequency for predictable EMI spectrum placement |
Applications
| Cellular Handset VCO Supply | Wireless PCMCIA Card Power |
|---|---|
Use Scenario: Providing clean 5V bias to voltage-controlled oscillators in GSM/EDGE transceivers operating from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Primary low-noise regulated supply for VCO core; replaces discrete charge pump + LDO solutions. Use Value: 64µVRMS noise ensures phase noise floor remains below –140dBc/Hz at 10kHz offset, meeting 3GPP spectral mask requirements. |
Use Scenario: Generating stable 5V from 3.3V host bus for RF front-end ICs in laptop wireless LAN cards. IC Role / Device Role / Timing Role: Dedicated low-noise auxiliary supply isolating sensitive RF circuitry from noisy digital bus rails. Use Value: Eliminates need for ferrite beads and LC filters, reducing BOM count by 3–5 components while maintaining <100µVP-P ripple. |
| Portable Medical Instrument Sensor Bias | Remote Transmitter RF Module Supply |
Use Scenario: Powering ultra-low-noise op-amps and ADC reference buffers in handheld ECG monitors powered by 3.6V lithium primary cells. IC Role / Device Role / Timing Role: Precision analog supply rail decoupled from main system regulator to prevent digital switching noise injection. Use Value: 50mA capability supports multi-channel analog front-ends; 1µA shutdown extends battery life beyond 5 years in standby mode. |
Use Scenario: Delivering 5V to ISM-band (902–928MHz) transmitters in battery-operated telemetry nodes with 10-year field life requirements. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent boost-LDO combo enabling >90% duty-cycle sleep modes. Use Value: 150µA operating current and 1µA shutdown minimize average power draw; MSOP-8 footprint fits constrained PCB real estate. |
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#PBF | Fixed 3.3V output; 58µVRMS noise; identical pinout and thermal specs | Used where 3.3V logic-compatible VCOs or RF ICs require lower headroom | Select when system VCO operates optimally at 3.3V - avoids unnecessary 5V-to-3.3V conversion loss |
| LT1761ES5-5#TRPBF | LDO-only (no charge pump); 20µVRMS noise; requires ≥4.5V input; SOT-23-5 package | Suitable only if input rail ≥4.5V is available; lacks boosting capability | Choose only when VIN ≥4.5V is guaranteed - trades boosting flexibility for lower noise and smaller footprint |
Compared with LTC1682IMS8-3.3#PBF, the LTC1682IMS8-5#PBF provides higher output voltage for 5V-tolerant VCOs but with slightly higher noise; versus LT1761ES5-5#TRPBF, it enables operation from 2.7V inputs but adds charge pump complexity and 3× higher output noise.
Availability
LTC1682IMS8-5#PBF is available at Aetrix Electronics and suitable for cellular handset design, wireless PCMCIA card development, and portable medical instrumentation requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long-term production continuity.
Supply support for LTC1682IMS8-5#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 legacy Linear parts including the LTC1682 family.
The LTC1682 series was designed specifically for RF subsystems requiring clean, boosted supplies in space-constrained portable devices - emphasizing low noise, ceramic-only operation, and robust thermal protection.
FAQ
What is the minimum input voltage required for LTC1682IMS8-5#PBF to regulate 5V output?
The LTC1682IMS8-5#PBF requires a minimum input voltage of 2.7V to maintain 5V regulation across temperature and load, as specified in the Electrical Characteristics table. Below 2.7V, the LDO enters dropout and VOUT drops below 5V; the charge pump continues operating but cannot sustain sufficient CPO voltage to enable regulation.
Can LTC1682IMS8-5#PBF be used with tantalum output capacitors?
No - the LTC1682IMS8-5#PBF requires low-ESR ceramic capacitors (≥2µF) on both VOUT and CPO pins for stability and noise performance. Tantalum capacitors exhibit higher ESR and inductance, which degrade transient response, increase output ripple, and risk instability per the datasheet's capacitor selection guidelines.
Does LTC1682IMS8-5#PBF support adjustable output voltages?
No - the LTC1682IMS8-5#PBF is a fixed 5V version. Only the base LTC1682 (without suffix) supports adjustable outputs via external resistor divider on the FB pin. Pin 3 on LTC1682IMS8-5#PBF is labeled FILT and must be connected to a 1nF capacitor to ground, not used for feedback.
What is the thermal resistance (θJA) of LTC1682IMS8-5#PBF in MSOP-8 package?
The LTC1682IMS8-5#PBF has a junction-to-ambient thermal resistance (θJA) of 140°C/W when mounted on a standard 2-layer JEDEC test board, as documented in the Package Information section. This value assumes GND pin connected to a minimal copper area; actual θJA improves significantly with larger thermal pads.
How does Burst Mode operation affect output noise in LTC1682IMS8-5#PBF?
In Burst Mode (active below ~100µA load), the LTC1682IMS8-5#PBF disables the 550kHz oscillator between charge cycles, reducing quiescent current to 150µA but increasing output noise by ~20% compared to continuous mode - measured as 600µVP-P (10Hz–2.5MHz) versus 500µVP-P in continuous operation per datasheet specifications.
LTC1682IMS8-5#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1682IMS8-5#PBF FAQ
1.How can I place an order for LTC1682IMS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682IMS8-5#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 LTC1682IMS8-5#PBF reliable?
The price and inventory of LTC1682IMS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682IMS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1682IMS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682IMS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682IMS8-5#PBF?
LTC1682IMS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682IMS8-5#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 LTC1682IMS8-5#PBF?
For technical support, including LTC1682IMS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682IMS8-5#PBF requirements.
6.How does Aetrix verify that LTC1682IMS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1682IMS8-5#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 LTC1682IMS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1682IMS8-5#PBF?
All LTC1682IMS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682IMS8-5#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 LTC1682IMS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1682IMS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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