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Analog Devices Inc. LTC1046CN8#PBF
- Part No.:
- LTC1046CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1046CN8#PBF.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:486
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Product details
Overview
LTC1046CN8#PBF from Analog Devices is a 50mA monolithic CMOS switched-capacitor voltage converter optimized for 1.5V–6V input operation. It performs inverting (VOUT = –VIN), halving (VOUT = VIN/2), and supply-splitting (±VS/2) functions with 27Ω max output resistance at 5V input and 50mA load, enabling compact dual-rail generation in battery-powered instrumentation and portable analog systems.
For engineers reviewing the LTC1046CN8#PBF datasheet, LTC1046CN8#PBF pinout, LTC1046CN8#PBF application, or LTC1046CN8#PBF equivalent, key selection criteria include output current capability (50mA), low-no-load supply current (300µA), boost-pin frequency control, and PDIP-8 compatibility with legacy ICL7660/LTC1044 footprints.
Technical Context
The LTC1046CN8#PBF implements a two-phase switched-capacitor topology with internal MOSFET switches driven by an on-chip oscillator whose frequency is adjustable via BOOST (Pin 1) and OSC (Pin 7). Its logic core operates between V+ and LV (Pin 6), which is internally shorted to GND when V+ ≥ 3V.
Output impedance is dominated by 1/(f·C₁) at low frequencies and MOS switch RON at high frequencies; typical fOSC is 30kHz at V+ = 5V with COSC = 0pF, rising to ~90kHz when BOOST is tied to V+. Conversion efficiency exceeds 95% across 1–50mA loads at 5V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA maximum - supports rail-splitting and dual-supply biasing for op-amps and ADCs without inductors |
| Supply Voltage Range | 1.5V to 6V - enables direct use with single-cell Li-ion, alkaline, or regulated 3.3V/5V rails |
| Output Resistance | 27Ω max at 5V/50mA - defines voltage droop under load; lower than ICL7660 (55Ω) |
| No-Load Supply Current | 300µA max at 5V - ensures low quiescent power in always-on sensor interfaces |
| Oscillator Frequency | 30kHz typical (V+ = 5V, BOOST open) - sets ripple frequency and output impedance trade-off |
| Voltage Conversion Efficiency | 97% min open-circuit - preserves input energy during inversion or division with minimal loss |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade embedded and industrial control applications |
Pinout & Package
Package: 8-Lead PDIP (N8), 0.300-inch width, through-hole mounting, JEDEC MS-001 compliant. RoHS-compliant lead-free finish (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 8) | Positive supply input | Accepts 1.5V–6V; powers internal logic and charge pump; must be stable during switching |
| OSC (Pin 7) | Oscillator timing node | Internal oscillator output; frequency set by external capacitance or boosted via Pin 1 |
| LV (Pin 6) | Logic supply reference | Internally tied to GND when V+ ≥ 3V; must be externally grounded if V+ < 3V |
| VOUT (Pin 5) | Inverted/divided output | Delivers –VIN, VIN/2, or ±VS/2 depending on external capacitor configuration |
| BOOST (Pin 1) | Oscillator current boost | Tying to V+ triples switching frequency (~90kHz), reducing output impedance and ripple |
| CAP+ (Pin 2) | Charge pump flying capacitor positive terminal | Connects to one side of external flying capacitor (e.g., 10µF tantalum) |
| GND (Pin 3) | Ground reference | System ground return for logic, charge pump, and output; must be low-impedance |
| CAP– (Pin 4) | Charge pump flying capacitor negative terminal | Connects to other side of flying capacitor; polarity critical for inversion function |
Key Features
| Feature | Design Value |
|---|---|
| Plug-in replacement for ICL7660/LTC1044 | Same 8-pin PDIP footprint and basic functionality, but delivers 2.5× higher output current |
| Boost-pin frequency control | Enables dynamic adjustment of switching frequency to optimize output impedance vs. EMI trade-offs |
| Low 300µA no-load current | Minimizes battery drain in standby mode for portable medical and data acquisition devices |
| Multiple conversion modes | Single device supports inverting, halving, and supply-splitting topologies via capacitor reconfiguration |
| Wide 1.5V–6V input range | Operates directly from single Li-ion (3.0–4.2V), two AA cells (2.4–3.2V), or regulated 5V rails |
Applications
| Battery-Powered Instrumentation | Rail-Splitting for Op-Amp Bias |
|---|---|
Use Scenario: Portable multimeter or handheld oscilloscope requiring ±5V analog front-end supplies from a single 9V battery. IC Role / Device Role / Timing Role: LTC1046CN8#PBF acts as a battery splitter, generating symmetrical +4.5V and –4.5V outputs referenced to common ground. Use Value: Eliminates need for bulky inductors or dual-output regulators, reducing BOM cost and PCB area while maintaining 50mA drive capability. | Use Scenario: Single-supply audio amplifier or precision sensor signal conditioner needing bipolar rails for op-amp input stage. IC Role / Device Role / Timing Role: LTC1046CN8#PBF serves as a supply splitter, delivering ±VS/2 from a 5V microcontroller rail to enable true DC-coupled analog signal processing. Use Value: Provides low-noise, stable split rails without external diodes or feedback loops-critical for 16-bit ADC reference buffering. |
| Precision Voltage Division | Low-Power Inverting Converter |
Use Scenario: Calibration circuit in automated test equipment requiring ultra-stable 2.500V reference from a 5.000V master source. IC Role / Device Role / Timing Role: LTC1046CN8#PBF configured as a halving converter (VOUT = VIN/2) with <0.002% error under 100nA load. Use Value: Achieves sub-100ppm accuracy without trimming resistors or op-amp buffers-reducing drift and long-term calibration burden. | Use Scenario: IoT node sensor interface where a 3.3V MCU needs –3.3V for level-shifting or analog front-end biasing. IC Role / Device Role / Timing Role: LTC1046CN8#PBF operates as an inverting converter (VOUT = –VIN) with 300µA quiescent current and 27Ω output impedance. Use Value: Delivers clean inverted rail at 3.3V input with no magnetic components-avoiding EMI concerns in RF-sensitive wireless modules. |
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 |
|---|---|---|---|
| LTC1044CS8#PBF | 20mA output current, 55Ω output resistance, SO-8 package | Lower drive capability; suitable only for ≤20mA loads like low-power comparators | Select when board space is constrained and output current demand is ≤20mA |
| LT1054CN8#PBF | 100mA output, integrated regulator, higher quiescent current (1.2mA) | Includes internal regulation for stable –5V output; requires external inductor for boost mode | Select when precise regulated negative output is required and inductor use is acceptable |
Compared with LTC1046CN8#PBF, LTC1044CS8#PBF offers smaller footprint but sacrifices 60% output current and higher output impedance, while LT1054CN8#PBF delivers double the current with regulation but adds complexity and quiescent power-making LTC1046CN8#PBF optimal for unregulated, high-current, inductorless inversion in commercial-temperature environments.
Availability
LTC1046CN8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, rail-splitting for op-amp bias, precision voltage division, and low-power inverting converter applications requiring stable component supply across commercial temperature ranges.
Supply support for LTC1046CN8#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 precision instrumentation, industrial automation, and communications markets since 1965.
The LTC1046CN8#PBF belongs to Analog Devices' legacy Linear Technology switched-capacitor converter family, designed specifically for inductorless DC/DC conversion in space-constrained, low-EMI analog systems where reliability and ease of use are critical.
FAQ
What is the maximum continuous output current specification for the LTC1046CN8#PBF?
The LTC1046CN8#PBF is rated for 50mA maximum continuous output current at V+ = 5V and TA = 25°C, with output resistance held to 27Ω. This rating applies across the full 0°C to 70°C operating temperature range per the datasheet's electrical characteristics table. Derating is required above 25°C ambient, and output voltage droop must be verified against load requirements in final design validation using the VOUT vs IL curves.
Can the LTC1046CN8#PBF generate a regulated –5V output from a 5V input?
The LTC1046CN8#PBF provides unregulated voltage conversion only-it inverts, halves, or splits the input but does not regulate output voltage. From a stable 5V input, it delivers approximately –5V with ±2% variation over load and temperature due to its 27Ω output resistance. For regulated –5V, an external LDO or feedback-based solution is required; alternatively, the LT1054CN8#PBF (listed as an alternative) integrates regulation but requires an inductor.
Is the LTC1046CN8#PBF pin-compatible with the ICL7660 in an 8-pin PDIP socket?
Yes, the LTC1046CN8#PBF is explicitly designed as a plug-in compatible upgrade for the ICL7660 and LTC1044 in 8-pin PDIP sockets. Pin assignments, voltage ratings, and basic functional behavior match, though the LTC1046CN8#PBF delivers 2.5× higher output current and lower output resistance. No PCB changes are needed for drop-in replacement in existing ICL7660 designs operating within 1.5V–6V input range.
What is the role of the BOOST pin (Pin 1) on the LTC1046CN8#PBF, and how does it affect performance?
The BOOST pin (Pin 1) on the LTC1046CN8#PBF increases internal oscillator current, raising switching frequency by ~3×-e.g., from 30kHz to ~90kHz at V+ = 5V. This reduces effective output impedance (by lowering the 1/fC term) and output voltage ripple, improving regulation under dynamic loads. It does not alter conversion ratio or efficiency ceiling, but shifts the peak efficiency point toward higher frequencies per the typical performance curves.
Does the LTC1046CN8#PBF require external diodes for basic inverting operation?
No, the LTC1046CN8#PBF does not require external diodes for basic inverting operation (VOUT = –VIN). Its internal CMOS switch matrix and charge-pump architecture perform inversion using only two external flying capacitors (e.g., 10µF tantalum on CAP+ and CAP–). Diodes are unnecessary and would degrade efficiency-unlike discrete charge-pump circuits. The datasheet's Figure 7 confirms diode-free operation across full temperature and supply ranges.
LTC1046CN8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1046CN8#PBF FAQ
1.How can I place an order for LTC1046CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1046CN8#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 LTC1046CN8#PBF reliable?
The price and inventory of LTC1046CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1046CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1046CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1046CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1046CN8#PBF?
LTC1046CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1046CN8#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 LTC1046CN8#PBF?
For technical support, including LTC1046CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1046CN8#PBF requirements.
6.How does Aetrix verify that LTC1046CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1046CN8#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 LTC1046CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1046CN8#PBF?
All LTC1046CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1046CN8#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 LTC1046CN8#PBF part is unused and in its original packaging.
Return procedure for LTC1046CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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