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Analog Devices Inc. LTC1682IS8-5#PBF
- Part No.:
- LTC1682IS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1682IS8-5#PBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
LTC1682IS8-5#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 LTC1682IS8-5#PBF datasheet, LTC1682IS8-5#PBF pinout, LTC1682IS8-5#PBF application, or LTC1682IS8-5#PBF equivalent, key selection criteria include its guaranteed –40°C to 85°C industrial temperature rating, 5V ±1% output accuracy at 1mA load, 550kHz switching frequency, shutdown current <5µA, and compatibility with 2µF minimum output capacitance for stability.
Technical Context
The LTC1682IS8-5#PBF integrates a switched-capacitor voltage doubler and a low-dropout linear regulator in a single 8-pin SO package. The charge pump generates ~2×VIN at CPO, which feeds an internal LDO that filters ripple and regulates to a precise 5V output. Its Burst Mode operation activates below 100µA load to reduce quiescent current while maintaining acceptable noise.
Internal protection includes thermal shutdown (trip at 150°C, resume at 140°C), short-circuit current limiting, and LDO disable logic that disconnects VOUT when CPO falls below 1.45×VIN. Pin 3 functions as FILT (not FB), requiring a 1nF capacitor to ground for optimal reference filtering and noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% (3.23V–3.37V for -3.3 variant; confirmed for LTC1682IS8-5#PBF per Electrical Characteristics table) |
| Input Voltage Range | 2.7V to 4.4V - ensures reliable operation across Li-ion battery discharge profile (3.0V–4.2V) without brownout |
| Output Noise | 64µVRMS (10Hz–100kHz); 600µVP-P (10Hz–2.5MHz) - enables direct powering of VCOs requiring ultra-low phase noise |
| Max Output Current | 50mA continuous - sufficient for biasing multiple RF ICs or high-side switches in portable transceivers |
| Quiescent Current | 150µA typical (0°C–70°C), 150–300µA (–40°C–85°C) - supports always-on subsystems with minimal battery drain |
| Shutdown Current | <5µA - allows deep-sleep states in battery-powered devices without external load switches |
| Switching Frequency | 550kHz ±70kHz - high enough to avoid audible noise and simplify EMI filtering, low enough for efficient ceramic capacitor use |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended commercial environments, not just commercial grade |
Pinout & Package
Package: 8-lead plastic SO (Small Outline, narrow 0.150"), JEDEC MS-012AC, footprint compatible with standard SOIC-8 but with tighter lead pitch (1.27mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Regulated 5V output | Low-noise LDO output; requires ≥2µF low-ESR ceramic capacitor directly at pin for stability and transient response |
| SHDN (Pin 2) | Active-high enable input | Logic high (≥1.6V) enables device; logic low (≤0.4V) disables regulator and discharges VOUT via 100Ω switch to GND |
| FILT (Pin 3) | Reference filter node | High-impedance connection for 1nF capacitor to ground - critical for minimizing reference noise and achieving specified 64µVRMS |
| GND (Pin 4) | Power and signal ground | Main thermal and current return path; must connect 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 with C+ minimizes EMI |
| VIN (Pin 6) | Main power input | Accepts 2.7V–4.4V; requires ≥2µF low-ESR bypass capacitor near pin to suppress supply rail noise and support charge pump transients |
| C+ (Pin 7) | Flying capacitor positive terminal | Connects to positive side of 0.22µF ceramic flying capacitor; forms charge transfer path with C– |
| CPO (Pin 8) | Unregulated charge pump output | ~2×VIN (e.g., ~6.6V at VIN=3.3V); supplies LDO; requires ≥2µF low-ESR capacitor to minimize ripple feeding into LDO |
Key Features
| Feature | Design Value |
|---|---|
| Integrated doubler + LDO | Eliminates need for external boost converter and post-regulator - reduces BOM count and PCB area by >40% vs discrete solution |
| No inductor required | Enables fully ceramic, compact, EMI-optimized design - avoids inductor saturation, size, cost, and magnetic coupling issues |
| Industrial temperature grade | Guaranteed operation from –40°C to +85°C - suitable for automotive infotainment, industrial telemetry, and outdoor wireless nodes |
| Burst Mode efficiency | Reduces operating current to ≤150µA under light loads (<100µA), extending battery life in intermittent-use applications |
| Thermal & short-circuit protection | Auto-recovers from overtemperature (>150°C) and indefinite VOUT short-to-ground - improves system reliability without external supervision |
| Low dropout voltage | 90mV max at 10mA load - maintains regulation down to VIN = 5.09V, enabling use with aging batteries or low-headroom supplies |
Applications
| Cellular Handset VCO Supply | Wireless PCMCIA Card Power |
|---|---|
Use Scenario: Providing clean 5V bias to voltage-controlled oscillators in GSM/UMTS handset front-ends where phase noise directly impacts adjacent channel rejection. IC Role / Device Role / Timing Role: Low-noise regulated power source replacing noisy DC/DC converters or inefficient LDOs fed from higher-voltage rails. Use Value: Achieves 64µVRMS noise at VCO supply pin, reducing close-in phase noise by >10dB compared to standard 5V LDOs - measurable improvement in receiver sensitivity. | Use Scenario: Generating stable 5V for RF transceivers and baseband processors in legacy laptop PCMCIA wireless cards operating from 3.3V host bus. IC Role / Device Role / Timing Role: Compact, inductorless voltage booster enabling full 5V compliance from 3.3V-only slot power without redesigning card layout. Use Value: Eliminates need for external boost IC + LDO cascade, saving >25mm² board space and reducing component count by 5 parts while meeting EN55022 Class B emissions limits. |
| Portable Medical Instrument Sensor Bias | Remote ISM-Band Transmitter |
Use Scenario: Supplying ultra-low-noise excitation voltage to precision analog front-ends in handheld ECG or pulse oximetry sensors where supply ripple couples into biopotential measurements. IC Role / Device Role / Timing Role: Precision LDO stage following charge pump - rejects >60dB of switching ripple while delivering stable 5V reference for ADC drivers and op-amps. Use Value: Enables 16-bit effective resolution in battery-powered medical devices by limiting supply-induced noise floor to <1 LSB at 100ksps sampling. | Use Scenario: Powering sub-GHz ISM-band transmitters (e.g., 868/915MHz) in battery-operated remote sensors deployed in agricultural or industrial monitoring networks. IC Role / Device Role / Timing Role: Primary 5V rail generator supporting RF PA, MCU, and sensor interface - operates across full battery range (3.0V–4.2V) with consistent output regulation. Use Value: Delivers 50mA peak current with <5µA shutdown draw, enabling 10-year battery life in wake-on-radio designs using 2500mAh Li-SOCl₂ cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise boosted supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1682IS8-3.3#PBF | Fixed 3.3V output; 58µVRMS noise; same package, pinout, and thermal specs | Targeted at 3.3V logic/RF ICs (e.g., Bluetooth SoCs) instead of 5V VCOs or legacy peripherals | Select when system requires 3.3V rail with identical noise performance and footprint - no PCB changes needed |
| LT3467ES6#TRPBF | Step-up DC/DC with integrated 5V LDO; 200kHz switching; 20µVRMS noise; SOT-23-6 package | Higher efficiency at medium loads (>20mA); smaller footprint but lower max output current (25mA) | Prefer for space-constrained designs needing <25mA at 5V with lowest possible noise - requires different layout and feedback network |
Compared with LTC1682IS8-3.3#PBF, the LTC1682IS8-5#PBF provides higher output voltage essential for 5V-tolerant RF components, while LT3467ES6#TRPBF offers superior noise and smaller size but sacrifices 50% output current capability and requires inductor-based design.
Availability
LTC1682IS8-5#PBF is available at Aetrix Electronics and suitable for cellular handset VCO supplies, wireless PCMCIA cards, portable medical instrument sensor bias, and remote ISM-band transmitters requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1682IS8-5#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, documentation, and manufacturing continuity for all LTC parts. Linear's legacy expertise in precision analog and power management remains integral to ADI's high-performance power solutions portfolio.
The LTC1682 family was designed specifically for RF and mixed-signal systems demanding ultra-low-noise, inductorless, wide-input-voltage power conversion - targeting cellular infrastructure, portable communications, and instrumentation markets where EMI and board space are critical constraints.
FAQ
What is the guaranteed output voltage tolerance for LTC1682IS8-5#PBF over temperature?
The LTC1682IS8-5#PBF guarantees a regulated 5.0V output with ±1% tolerance (4.9V to 5.1V) across the full –40°C to +85°C industrial temperature range at 1mA load, as specified in the Electrical Characteristics table under "Regulated Output Voltage" for LTC1682-5.
Can LTC1682IS8-5#PBF operate from a 2.5V input supply?
No - the LTC1682IS8-5#PBF has a minimum input voltage of 2.7V per the Electrical Characteristics table. Attempting to operate below 2.7V may result in failure to regulate or unpredictable shutdown behavior due to insufficient CPO headroom for the internal LDO.
Is an external resistor divider required to set the output voltage of LTC1682IS8-5#PBF?
No - the LTC1682IS8-5#PBF is the fixed 5V version; it contains an internal resistor divider and uses Pin 3 as FILT (not FB). An external divider is only required for the adjustable LTC1682 variant (e.g., LTC1682IS8#PBF), where Pin 3 serves as FB.
What capacitor value is required on the FILT pin of LTC1682IS8-5#PBF?
A 1nF ceramic capacitor must be connected between Pin 3 (FILT) and ground for the LTC1682IS8-5#PBF to achieve the specified 64µVRMS output noise. Omitting this capacitor degrades noise performance and may cause instability in the internal reference.
Does LTC1682IS8-5#PBF require a minimum output capacitor for stability?
Yes - the LTC1682IS8-5#PBF requires a minimum 2µF low-ESR ceramic capacitor on VOUT (Pin 1) for stability and adequate load transient response. Using less than 2µF risks oscillation or excessive overshoot during step-load events.
How does the shutdown function behave on LTC1682IS8-5#PBF?
When SHDN (Pin 2) is pulled low (<0.4V), the LTC1682IS8-5#PBF reduces supply current to <5µA, disables the LDO, disconnects CPO from VIN, and actively discharges VOUT to ground through an internal 100Ω switch - ensuring rapid rail collapse for system-level power sequencing.
LTC1682IS8-5#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1682IS8-5#PBF FAQ
1.How can I place an order for LTC1682IS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1682IS8-5#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 LTC1682IS8-5#PBF reliable?
The price and inventory of LTC1682IS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1682IS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1682IS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1682IS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1682IS8-5#PBF?
LTC1682IS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1682IS8-5#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 LTC1682IS8-5#PBF?
For technical support, including LTC1682IS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1682IS8-5#PBF requirements.
6.How does Aetrix verify that LTC1682IS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1682IS8-5#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 LTC1682IS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1682IS8-5#PBF?
All LTC1682IS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1682IS8-5#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 LTC1682IS8-5#PBF part is unused and in its original packaging.
Return procedure for LTC1682IS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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