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Analog Devices Inc. LTC1046IN8#PBF
- Part No.:
- LTC1046IN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1046IN8#PBF.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,345
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Product details
Overview
LTC1046IN8#PBF from Analog Devices is a monolithic CMOS switched-capacitor voltage converter optimized for 5V-to–5V inversion with 50mA output current, 27Ω max output resistance, and 97% open-circuit voltage conversion efficiency. It operates across –40°C to +85°C and replaces ICL7660/LTC1044 in space-constrained industrial and portable systems requiring low-noise dual-rail supplies.
For engineers reviewing the LTC1046IN8#PBF datasheet, LTC1046IN8#PBF pinout, LTC1046IN8#PBF application, or LTC1046IN8#PBF equivalent, key selection criteria include its 1.5V–6V input range, BOOST pin-enabled frequency scaling, LV pin logic reference configuration, and PDIP-8 thermal performance (θJA = 130°C/W).
Technical Context
The LTC1046IN8#PBF implements a four-phase switched-capacitor topology with internal MOSFET switches, supporting three modes: inversion (VOUT = –VIN), division (VOUT = VIN/2), and multiplication (±nVIN). Its oscillator frequency (4–30kHz) is user-adjustable via external capacitor on Pin 7 or BOOST pin (Pin 1) connection to V+.
Internal logic operates between V+ and LV (Pin 6), which is internally shorted to GND when V+ ≥ 3V-enabling simplified biasing. Output impedance is dominated by 1/(f·C1) at low frequencies and switch RON at high frequencies, directly impacting load regulation and ripple under 50mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA maximum-supports rail-splitting and op-amp dual-supply generation without external pass transistors. |
| Input Voltage Range | 1.5V to 6V-enables direct use with single-cell Li-ion (3.0–4.2V), alkaline (1.5–3.0V), or regulated 5V rails. |
| Output Resistance | 27Ω maximum at 5V/50mA-determines load regulation slope (ΔVOUT = IL × 27Ω) and limits minimum stable load. |
| No-Load Supply Current | 300µA maximum at 5V-critical for battery life in always-on sensor nodes and low-power instrumentation. |
| Voltage Conversion Efficiency | 97% minimum open-circuit-minimizes heat rise in sealed enclosures; drops to 95% under full 50mA load due to switching losses. |
| Oscillator Frequency Range | 4kHz to 30kHz-adjustable via COSC (Pin 7); higher fOSC lowers output impedance but increases switching loss. |
| Operating Temperature | –40°C to +85°C-qualified for automotive cabin, industrial PLC, and outdoor IoT edge devices. |
Pinout & Package
Package: 8-Lead PDIP (N8), 0.300-inch width, JEDEC MS-001 compliant. Thermal resistance θJA = 130°C/W; max junction temperature = 110°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 8) | Positive supply input | Primary power rail (1.5–6V); powers internal logic and charge pump switches. |
| OSC (Pin 7) | Oscillator timing node | Connects to external capacitor (0–100pF) to set switching frequency; can be driven externally. |
| LV (Pin 6) | Logic voltage reference | Internally tied to GND when V+ ≥ 3V; must be externally grounded if V+ < 3V. |
| VOUT (Pin 5) | Inverted/divided output | Delivers –V+, V+/2, or ±nV+ depending on external capacitor configuration; 27Ω source impedance. |
| BOOST (Pin 1) | Oscillator drive enhancement | Connecting to V+ triples fOSC, reducing output impedance and ripple at high loads. |
| CAP+ (Pin 2) | Charge pump flying capacitor positive terminal | Connects to one side of external flying capacitor (e.g., 10µF tantalum); carries bidirectional switching current. |
| GND (Pin 3) | Ground reference | System common return; LV pin ties here when V+ < 3V; critical for noise immunity in split-rail layouts. |
| CAP– (Pin 4) | Charge pump flying capacitor negative terminal | Connects to other side of flying capacitor; phase-inverted relative to CAP+ during switching cycle. |
Key Features
| Feature | Design Value |
|---|---|
| Plug-in compatibility with ICL7660/LTC1044 | Pin-for-pin and functionally identical footprint-enables drop-in upgrade to 2.5× output current without PCB rework. |
| Boost pin (Pin 1) control | Tripling of oscillator frequency reduces effective output resistance by ~65%, improving regulation at 40–50mA loads. |
| Wide 1.5V–6V input range | Supports direct operation from single alkaline, NiMH, or Li-ion cells-eliminates need for pre-regulation in portable designs. |
| Low 300µA no-load quiescent current | Extends battery runtime in sleep-mode applications such as remote sensors and wearables with infrequent wake-ups. |
| 97% open-circuit voltage efficiency | Minimizes input-to-output voltage error in precision voltage division (e.g., VOUT = VIN/2) for ADC reference splitting. |
Applications
| Portable Instrumentation | Rail-Splitting for Op-Amps |
|---|---|
Use Scenario: Handheld multimeter requiring ±5V analog front-end from a single 9V battery. IC Role / Device Role / Timing Role: LTC1046IN8#PBF generates –5V rail while dividing 9V to +4.5V, enabling true bipolar signal measurement. Use Value: Eliminates discrete inductor-based DC/DC converters-reducing BOM cost by 40% and board area by 65% versus buck-boost solutions. |
Use Scenario: Low-noise audio preamplifier using dual-supply op-amps in a compact enclosure. IC Role / Device Role / Timing Role: LTC1046IN8#PBF acts as a supply splitter (VOUT = ±VS/2) to create symmetrical ±4.5V rails from 9V input. Use Value: Achieves <0.1% load regulation error up to 30mA per rail-critical for THD-sensitive audio stages without added LDO post-regulation. |
| Precision Sensor Signal Conditioning | Legacy System Voltage Translation |
Use Scenario: Strain-gauge bridge amplifier needing ultraprecise ±2.5V references from a 5V microcontroller supply. IC Role / Device Role / Timing Role: LTC1046IN8#PBF configured as VOUT = VIN/2 delivers 2.5V with 0.0002% accuracy at <100nA load. Use Value: Replaces resistor-divider + op-amp buffer-cutting component count by 5 parts and eliminating drift-induced offset errors. |
Use Scenario: Retrofitting obsolete ICL7660-based medical device with extended temperature support. IC Role / Device Role / Timing Role: LTC1046IN8#PBF substitutes for ICL7660 in existing PDIP-8 footprint while extending operating range to –40°C. Use Value: Maintains legacy layout and firmware while adding 50mA drive capability-enabling integration of additional analog circuitry without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1044ACS8#PBF | 20mA output current, 55Ω max ROUT, SO-8 package, 0°C–70°C rating | Lower drive capability and narrower temp range-suitable only for ≤20mA, commercial-grade applications | Select when board space is constrained and load current ≤20mA; not suitable for industrial ambient conditions. |
| LT1054CN8#PBF | 100mA output, integrated regulator, higher quiescent current (1.5mA), same PDIP-8 footprint | Provides regulated –5V output but consumes 5× more no-load current-trade-off favors stability over battery life | Choose when precise output voltage regulation (<1% tolerance) is required despite higher IS; verify thermal derating at 100mA. |
Compared with LTC1046IN8#PBF, LTC1044ACS8#PBF offers smaller form factor but sacrifices 60% output current and industrial temperature support, while LT1054CN8#PBF delivers higher current and regulation at the cost of 5× quiescent power-making LTC1046IN8#PBF optimal for balanced performance in battery-powered industrial systems.
Availability
LTC1046IN8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, rail-splitting for op-amps, precision sensor signal conditioning, and legacy system voltage translation requiring stable component supply across extended temperature ranges.
Supply support for LTC1046IN8#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC1046 product line delivers monolithic switched-capacitor voltage converters for inductorless power conversion in space- and cost-sensitive applications-designed specifically to replace legacy charge pumps while increasing output drive and simplifying system-level power architecture.
FAQ
What is the maximum continuous output current of the LTC1046IN8#PBF?
The LTC1046IN8#PBF delivers up to 50mA continuous output current when configured for inversion (VOUT = –VIN) with V+ = 5V, COSC = 0pF, and TA ≤ 85°C. Derating applies above 70°C ambient; at 85°C, maximum sustained current is 42mA to maintain junction temperature below 110°C.
Can the LTC1046IN8#PBF generate +5V from a 5V input?
No-the LTC1046IN8#PBF does not support voltage boosting (VOUT > VIN). Its supported functions are inversion (VOUT = –VIN), division (VOUT = VIN/2), and multiplication (±nVIN where n ≥ 1). To generate +5V from 5V, an external regulator or different topology (e.g., LT1611) is required.
How does the BOOST pin (Pin 1) affect LTC1046IN8#PBF performance?
Connecting the BOOST pin (Pin 1) of the LTC1046IN8#PBF to V+ triples the internal oscillator frequency-from ~10kHz to ~30kHz at V+ = 5V-reducing output impedance from ~60Ω to ~27Ω and lowering output voltage droop under 50mA load. This improves regulation but increases switching losses slightly.
Is the LTC1046IN8#PBF pin-compatible with the ICL7660?
Yes-the LTC1046IN8#PBF is pin-for-pin and functionally compatible with the ICL7660 and LTC1044 in PDIP-8 packages. All eight pins (V+, OSC, LV, VOUT, BOOST, CAP+, GND, CAP–) match identically, enabling direct replacement without layout changes or firmware updates.
What external capacitors are required for basic LTC1046IN8#PBF operation?
The LTC1046IN8#PBF requires two external 10µF low-ESR tantalum or ceramic capacitors: one between CAP+ (Pin 2) and CAP– (Pin 4) as the flying capacitor, and one between VOUT (Pin 5) and GND (Pin 3) as the output filter. For 50mA loads, ESR ≤ 0.5Ω is recommended to limit voltage drop and ripple.
LTC1046IN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 5.5kHz ~ 30kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1046IN8#PBF FAQ
1.How can I place an order for LTC1046IN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1046IN8#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 LTC1046IN8#PBF reliable?
The price and inventory of LTC1046IN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1046IN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1046IN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1046IN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1046IN8#PBF?
LTC1046IN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1046IN8#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 LTC1046IN8#PBF?
For technical support, including LTC1046IN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1046IN8#PBF requirements.
6.How does Aetrix verify that LTC1046IN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1046IN8#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 LTC1046IN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1046IN8#PBF?
All LTC1046IN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1046IN8#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 LTC1046IN8#PBF part is unused and in its original packaging.
Return procedure for LTC1046IN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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