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Analog Devices Inc. LTC1682CS8#PBF
- Part No.:
- LTC1682CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1682CS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:199
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Product details
Overview
LTC1682CS8#PBF from Analog Devices (formerly Linear Technology) is a dual-stage charge pump IC with integrated low-noise LDO regulator, designed to generate stable, ultra-low-noise boosted supply rails for RF-sensitive circuits. It accepts 1.8V–4.4V input, delivers up to 50mA at adjustable 2.5V–5.5V output, features 60µVRMS output noise (100kHz BW), operates at 550kHz switching frequency, and requires no inductors-only ceramic capacitors.
For engineers reviewing the LTC1682CS8#PBF datasheet, LTC1682CS8#PBF pinout, LTC1682CS8#PBF application, or LTC1682CS8#PBF equivalent, key selection criteria include its fixed 5V output variant compatibility, MSOP/SO-8 package footprint, shutdown current <5µA, thermal/short-circuit protection, and suitability for VCO power in cellular transceivers where phase noise integrity is critical.
Technical Context
The LTC1682CS8#PBF integrates a switched-capacitor voltage doubler followed by a precision low-dropout linear regulator. The charge pump stage generates ~2×VIN at CPO, which feeds the LDO; regulation occurs via internal 1.235V reference and error amplifier comparing FB voltage to that reference.
It employs burst-mode operation below 100µA load to reduce quiescent current to 150µA while maintaining LDO stability with ≥2µF output capacitance. Internal thermal shutdown activates above 150°C junction temperature, and short-circuit protection limits output current indefinitely without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 4.4V - supports single-cell Li-ion, NiMH, or 3.3V system rails without external level shifting. |
| Output Voltage | Fixed 5V (±2% over temp) - eliminates external feedback resistors; optimized for powering 5V VCOs and PLLs. |
| Output Noise | 64µVRMS (10Hz–100kHz) - enables clean RF biasing; measured with 1nF FILT capacitor and 4.7µF output cap. |
| Max Output Current | 50mA - sufficient for low-power VCOs, RF switches, and sensor signal chains without thermal derating. |
| Switching Frequency | 550kHz (±14%) - high enough to avoid audio-band interference; low enough for efficient ceramic capacitor use. |
| Shutdown Current | 1µA - enables battery-powered standby modes with negligible drain over months. |
| Dropout Voltage | 90mV @ 10mA - ensures regulation down to VIN = 4.1V when delivering 5V, maximizing usable input range. |
Pinout & Package
Package: 8-pin SO (Small Outline, narrow 0.150"), RoHS-compliant, lead-free (Pb-free) finish per #PBF suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated output | 5V low-noise supply rail; requires ≥2µF low-ESR ceramic capacitor directly at pin for stability and noise suppression. |
| SHDN (Pin 2) | Enable control input | Active-high logic; pulls VOUT to ground via 100Ω switch when low; connect to VIN for always-on operation. |
| FILT (Pin 3) | Reference filter node | Connects to 1nF capacitor to ground; filters internal 1.235V reference to minimize output voltage noise. |
| GND (Pin 4) | Power and signal reference | Main return path; must be tied to solid ground plane to minimize noise coupling and thermal resistance. |
| C– (Pin 5) | Flying capacitor negative terminal | Completes charge transfer cycle with C+; requires 0.22µF low-ESR ceramic capacitor rated ≥6.3V. |
| VIN (Pin 6) | Main input supply | 1.8V–4.4V input; bypassed with ≥2µF low-ESR capacitor near pin to suppress ripple and support transient current. |
| C+ (Pin 7) | Flying capacitor positive terminal | Alternates polarity with C– during charge pump operation; same capacitor connects between C+ and C–. |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN intermediate rail; bypassed with ≥2µF low-ESR capacitor; supplies LDO stage and must remain >1.45×VIN. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Enables compact, EMI-optimized layouts using only ceramic capacitors-no magnetic components or layout-sensitive inductors required. |
| Integrated LDO filtering | Reduces charge pump ripple by >40dB; delivers 64µVRMS noise vs. >800µVP-P unfiltered CPO ripple across 10Hz–2.5MHz bandwidth. |
| Thermal & short-circuit protection | Shuts down at 150°C junction temperature and limits output current indefinitely-no external current-sense or thermal monitoring needed. |
| Burst Mode efficiency | Reduces operating current to 150µA at light loads (<100µA), extending battery life in intermittent-use wireless modules. |
| Wide temperature rating | Specified for 0°C to 70°C commercial operation (C-grade); validated performance across full range ensures reliability in handheld environments. |
Applications
| Cellular Transceiver VCO Supply | Wireless PCMCIA Card Power |
|---|---|
Use Scenario: Providing ultra-low-noise 5V bias to voltage-controlled oscillators in GSM/EDGE baseband transceivers. IC Role / Device Role / Timing Role: Primary regulated supply for VCO core; replaces noisy switching regulators or inefficient linear post-regulators. Use Value: 64µVRMS noise preserves close-in phase noise performance at 902MHz carrier, meeting cellular spectral mask requirements. |
Use Scenario: Generating clean 5V rail for RF front-end ICs and digital baseband in laptop wireless expansion cards. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 3.3V host bus voltage to isolated 5V RF supply. Use Value: Eliminates need for separate DC/DC + LDO stages; reduces BOM count and PCB area while maintaining <100kHz ripple rejection. |
| Portable Medical Instrument Sensor Bias | Remote Wireless Transmitter Power |
Use Scenario: Powering low-noise analog front-ends (e.g., EEG amplifiers, pulse oximeter LEDs) in battery-operated diagnostic devices. IC Role / Device Role / Timing Role: Precision analog supply generator; decouples sensitive analog circuitry from noisy digital subsystems. Use Value: 150µA quiescent current extends battery runtime; 50mA output supports multi-channel sensor excitation without dropout. |
Use Scenario: Delivering stable 5V to ISM-band (902–928MHz) transmitter ICs in remote telemetry sensors powered by coin cells or energy harvesters. IC Role / Device Role / Timing Role: High-efficiency boost-and-regulate stage enabling long-term autonomous operation. Use Value: 1µA shutdown current allows multi-year shelf life; burst mode maintains efficiency across varying transmit duty cycles. |
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 |
|---|---|---|---|
| LTC1682CS8-5 | Identical SO-8 package, same electrical specs, but marked "CS8-5" instead of "CS8#PBF"; RoHS-compliant with Pb-free finish. | No functional difference; used interchangeably in new designs where part marking consistency is not required. | Select LTC1682CS8#PBF for guaranteed Pb-free compliance per JEDEC J-STD-609; LTC1682CS8-5 may have legacy plating variants. |
| LTC1682IMS8-5 | Same functionality and pinout, but rated for –40°C to 85°C industrial temperature range; higher θJA (140°C/W). | Required for outdoor or automotive-adjacent deployments where ambient exceeds 70°C. | Choose LTC1682IMS8-5 only if extended temperature operation is mandatory; LTC1682CS8#PBF is cost-optimized for consumer/portable use. |
Compared with LTC1682CS8#PBF, LTC1682CS8-5 offers identical performance with alternate marking, while LTC1682IMS8-5 trades commercial-grade cost for industrial temperature resilience-neither is pin-compatible with non-5V variants like LTC1682CS8 or LTC1682CS8-3.3 due to internal resistor network differences.
Availability
LTC1682CS8#PBF is available at Aetrix Electronics and suitable for cellular transceivers, wireless PCMCIA cards, portable medical instruments, and remote telemetry systems requiring stable component supply with low-noise power delivery.
Supply support for LTC1682CS8#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 technical and manufacturing continuity for all Linear products, including precision power management ICs.
The LTC1682 series belongs to Linear's low-noise power conversion portfolio, specifically engineered to replace inefficient inductor-based solutions in RF and portable instrumentation where spectral purity and board space are critical constraints.
FAQ
What is the maximum output current capability of the LTC1682CS8#PBF?
The LTC1682CS8#PBF delivers up to 50mA of continuous output current at 5V while maintaining regulation and thermal safety. At higher loads, internal current limiting engages, and output voltage drops; sustained operation above 50mA is not specified and may trigger thermal shutdown depending on PCB copper area and ambient conditions. The datasheet confirms 50mA as the maximum tested and guaranteed output under full temperature range.
Does the LTC1682CS8#PBF require external feedback resistors to set its output voltage?
No, the LTC1682CS8#PBF does not require external feedback resistors because it is the fixed 5V version (LTC1682-5 variant). Its internal resistor divider sets VOUT to 5.0V ±2%, with Pin 3 configured as FILT-not FB-so no external resistor network is needed. This simplifies layout and improves noise immunity compared to the adjustable LTC1682 version.
Can the LTC1682CS8#PBF operate from a 1.8V input supply?
Yes, the LTC1682CS8#PBF supports input voltages as low as 1.8V. At this minimum VIN, the charge pump generates ~3.6V at CPO, and the LDO maintains 5V output as long as CPO remains above 1.45×VIN (i.e., >2.61V). With proper capacitor sizing (≥4.7µF on CPO and VOUT), the device regulates stably down to 1.8V input across the full 0°C–70°C temperature range.
How does the LTC1682CS8#PBF achieve its low output noise specification?
The LTC1682CS8#PBF achieves 64µVRMS output noise through cascaded noise reduction: first, the charge pump uses controlled edge rates and non-overlapping clocks to minimize switching spikes; second, the integrated LDO provides >40dB ripple rejection; third, the FILT pin (Pin 3) accepts a 1nF capacitor to stabilize the 1.235V reference, directly lowering output voltage noise floor. All three mechanisms are active simultaneously in the LTC1682CS8#PBF.
Is the LTC1682CS8#PBF pin-compatible with other variants in the LTC1682 family?
Yes, the LTC1682CS8#PBF shares identical SO-8 pinout and footprint with all other LTC1682 variants (e.g., LTC1682CS8, LTC1682CS8-3.3), including matching pin functions: VOUT, SHDN, FILT/FB, GND, C–, VIN, C+, and CPO. However, Pin 3 function differs-FILT for fixed-output versions versus FB for adjustable-so external circuitry must match the variant's configuration to avoid malfunction.
LTC1682CS8#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/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#PBF FAQ
1.How can I place an order for LTC1682CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682CS8#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#PBF reliable?
The price and inventory of LTC1682CS8#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC1682CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682CS8#PBF?
LTC1682CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682CS8#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#PBF?
For technical support, including LTC1682CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682CS8#PBF requirements.
6.How does Aetrix verify that LTC1682CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1682CS8#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1682CS8#PBF?
All LTC1682CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682CS8#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#PBF part is unused and in its original packaging.
Return procedure for LTC1682CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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