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Analog Devices Inc. LTC1044ACN8#PBF
- Part No.:
- LTC1044ACN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1044ACN8#PBF.pdf
- Description:
- IC REG CHARG PUMP INV 20MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,255
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Product details
Overview
LTC1044ACN8#PBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter IC that performs inversion (VOUT = –VIN), doubling (VOUT = 2VIN), division (VOUT = VIN/2), and multiplication (VOUT = ±nVIN) without inductors. It operates from 1.5V to 12V supply, delivers up to 20mA load current, achieves ≥97% open-circuit voltage conversion efficiency, and supports boost-mode oscillator frequency multiplication for reduced external capacitor size - used in precision analog power rails, battery-powered instrumentation, and dual-supply generation from single sources.
For engineers reviewing the LTC1044ACN8#PBF datasheet, LTC1044ACN8#PBF pinout, LTC1044ACN8#PBF application, or LTC1044ACN8#PBF equivalent, key selection criteria include its 8-pin PDIP package, 0°C to 70°C operating range, 200µA max no-load supply current at 5V, 95% min power conversion efficiency, and compatibility with ICL7660/LTC1044 footprints where higher input voltage tolerance (up to 12V) is required.
Technical Context
The LTC1044ACN8#PBF implements a four-phase switched-capacitor topology with internal MOSFET switches controlled by a self-contained oscillator. Its BOOST pin (Pin 1) enables 7× oscillator frequency scaling, reducing output impedance and ripple under load. The LV pin (Pin 6) configures logic supply reference, automatically shorting to GND when V+ ≥ 3V.
Oscillator frequency is set via external capacitor on OSC pin (Pin 7), adjustable from ~1kHz to ~20kHz; disabling OSC (by tying to GND or V+) reduces supply current to 1.5µA. Output resistance is dominated by 1/(f·C₁) at low frequencies and switch RON at high frequencies, enabling design trade-offs between capacitor size, efficiency, and regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 12V - supports single-cell Li-ion, 3.3V/5V/9V/12V systems without external regulators |
| No-Load Supply Current | ≤200µA at 5V - enables ultra-low-quiescent operation in battery-backed circuits |
| Voltage Conversion Efficiency | ≥97% (open-circuit) - minimizes input-to-output voltage loss in precision divider/doubler applications |
| Power Conversion Efficiency | ≥95% at 5kHz, RL = 5kΩ - ensures minimal thermal rise and energy waste under typical loads |
| Oscillator Frequency Range | 1kHz to 20kHz (adjustable via COSC) - allows optimization of capacitor size vs. output impedance vs. EMI |
| Output Resistance | 100Ω typical at 5V, 5kHz - defines load regulation slope (~100mV/mA) and maximum usable load current |
| Boost Mode Gain | 7× oscillator frequency - permits use of smaller 1µF–10µF capacitors instead of 100µF for same output impedance |
Pinout & Package
Package: 8-Lead Plastic DIP (N8), 0.300-inch width, through-hole mount, JEDEC MS-001 compliant. Thermal resistance θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Oscillator frequency multiplier control | Tying to V+ increases internal clock frequency ~7×, lowering output impedance and ripple |
| CAP+ (Pin 2) | Positive flying capacitor terminal | Connects to one plate of main charge-transfer capacitor (C1); switching node during charge/discharge cycles |
| GND (Pin 3) | Ground reference and output common | System ground return; output voltage referenced to this pin in inverter/divider configurations |
| CAP– (Pin 4) | Negative flying capacitor terminal | Connects to second plate of C1; polarity reversal enables voltage inversion or doubling |
| VOUT (Pin 5) | Regulated output terminal | Delivers inverted, doubled, or divided output; series-equivalent resistance ~100Ω limits max load current |
| LV (Pin 6) | Logic voltage reference input | Internally shorted to GND when V+ ≥ 3V; must be externally grounded for V+ < 3V |
| OSC (Pin 7) | Internal oscillator timing node | External capacitor sets base frequency; can be driven by external logic for synchronous operation |
| V+ (Pin 8) | Positive supply input | Accepts 1.5V–12V input; absolute max rating is 13V; powers internal logic and switches |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless voltage conversion | Enables compact, low-EMI DC/DC solutions in space-constrained analog PCB layouts |
| Precision voltage division (VOUT = VIN/2 ±20ppm) | Supports ratiometric sensor interfaces and reference splitting without resistor networks |
| Configurable oscillator with BOOST pin | Reduces required flying capacitor size by 7× when using high-frequency mode |
| Ultra-low shutdown current (1.5µA) | Extends battery life in portable devices during sleep or standby modes |
| ICL7660/LTC1044 drop-in upgrade | Direct replacement in existing designs requiring extended 12V input capability and improved efficiency |
Applications
| Instrumentation Signal Conditioning | Battery-Powered Dual-Rail Systems |
|---|---|
Use Scenario: Generating clean ±5V rails from a single 10V lithium polymer battery for op-amp-based strain gauge bridge amplifiers. IC Role / Device Role / Timing Role: LTC1044ACN8#PBF acts as an inverting voltage converter, delivering –10V output with <100mV/mA load regulation to power negative rail of LM10/LT1413 signal chain. Use Value: Eliminates need for discrete diodes and inductors; achieves ±0.02% load regulation over 0–15mA per rail using 10µF tantalum capacitors. | Use Scenario: Splitting a 9V wall adapter into symmetrical ±4.5V supplies for low-power microcontroller ADC reference and analog front-end. IC Role / Device Role / Timing Role: LTC1044ACN8#PBF configured as supply splitter (VOUT = ±VS/2) with LV pin grounded, providing matched positive/negative outputs referenced to GND. Use Value: Delivers ±4.5V ±20ppm accuracy at <100nA load; enables ratiometric A/D conversion without external precision resistors. |
| Precision Sensor Reference Generation | Automotive Body Electronics |
Use Scenario: Creating a stable 2.5V reference from a 5V MCU supply for pressure transducer excitation in medical-grade handheld devices. IC Role / Device Role / Timing Role: LTC1044ACN8#PBF operated in voltage division mode (VOUT = VIN/2), with OSC pin disabled to minimize noise coupling into sensitive analog paths. Use Value: Achieves 0.002% division accuracy and <1.5µA quiescent draw - critical for battery runtime and measurement repeatability. | Use Scenario: Powering CAN transceiver bias rails and op-amps in 12V automotive body control modules where space and BOM count are constrained. IC Role / Device Role / Timing Role: LTC1044ACN8#PBF serves as high-voltage-tolerant (12V input) inverter, generating –12V for RS-485/CAN driver stages from main vehicle battery. Use Value: Withstands 13V absolute max rating and operates across 0°C–70°C ambient - meets AEC-Q200 Class 2 temperature requirements for non-engine compartments. |
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 |
|---|---|---|---|
| ICL7660CPA | Max input voltage 10V; no BOOST pin; 250µA max IS at 5V; lower conversion efficiency (90%) | Not suitable for 12V systems; higher output impedance limits load current to ≤10mA | Select only if legacy footprint compatibility is mandatory and input voltage remains ≤10V |
| LTC3265IDD#PBF | Low-noise, dual-output (±VOUT), integrated LDO post-regulators; 2.7–4.5V input; 2.5µA IQ | Requires external 3.3V/5V supply; provides regulated ±2.5V/±3.3V; not a direct 12V-capable replacement | Choose for noise-sensitive applications (e.g., precision ADCs) where regulated outputs and lower IQ outweigh voltage range limitations |
Compared with ICL7660CPA, LTC1044ACN8#PBF offers +2V higher input tolerance and 7× lower no-load current; versus LTC3265IDD#PBF, it trades integrated regulation and dual outputs for wider input range and simpler external component count in basic inverter/doubler roles.
Availability
LTC1044ACN8#PBF is available at Aetrix Electronics and suitable for precision analog power rails, battery-powered instrumentation, and dual-supply generation requiring stable component supply across industrial and medical device production cycles.
Supply support for LTC1044ACN8#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 legacy Linear parts including the LTC1044A family.
The LTC1044A product line was designed specifically for inductorless DC/DC conversion in space- and cost-constrained analog systems, targeting applications needing ± supplies, voltage doubling, or precision division without magnetic components.
FAQ
What is the maximum input voltage rating for the LTC1044ACN8#PBF?
The LTC1044ACN8#PBF has an absolute maximum supply voltage rating of 13V, with recommended continuous operation up to 12V. Exceeding 13V risks permanent damage. This 12V operational limit distinguishes it from earlier ICL7660 variants rated only to 10V, making LTC1044ACN8#PBF suitable for 12V battery and adapter-fed systems.
Can the LTC1044ACN8#PBF generate a precise half-supply voltage?
Yes, the LTC1044ACN8#PBF supports ultra-precision voltage division with VOUT = VIN/2 ±20ppm accuracy when load current is kept below 100nA. This function requires no external resistors and is implemented via internal switched-capacitor topology - a key capability documented in the LTC1044ACN8#PBF datasheet Figure 8 and Electrical Characteristics table.
How does the BOOST pin affect performance of the LTC1044ACN8#PBF?
Tying the BOOST pin (Pin 1) of the LTC1044ACN8#PBF to V+ increases the internal oscillator frequency by approximately 7×. This reduces output impedance and ripple, allowing smaller external flying capacitors (e.g., 1µF instead of 10µF) while maintaining regulation - directly confirmed in the LTC1044ACN8#PBF Typical Performance Characteristics (Figure G04/G05) and Applications Information section.
Is the LTC1044ACN8#PBF pin-compatible with the ICL7660?
Yes, the LTC1044ACN8#PBF is a direct pin-compatible upgrade to the ICL7660 in 8-pin DIP packages. It retains identical pinout, footprint, and basic functionality while adding BOOST pin capability, extended 12V input range, and improved efficiency - explicitly stated in the LTC1044ACN8#PBF datasheet first paragraph and Pin Configuration diagram.
What is the typical supply current of the LTC1044ACN8#PBF at 5V with no load?
The typical no-load supply current of the LTC1044ACN8#PBF at 5V is 15µA, with a maximum specified value of 200µA across the 0°C to 70°C operating range. When the OSC pin is tied to GND or V+, supply current drops further to 1.5µA - a key low-power feature verified in the Electrical Characteristics table (IS parameter, row 1).
LTC1044ACN8#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):
- 12V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 1kHz ~ 5kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1044ACN8#PBF FAQ
1.How can I place an order for LTC1044ACN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1044ACN8#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 LTC1044ACN8#PBF reliable?
The price and inventory of LTC1044ACN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1044ACN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1044ACN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1044ACN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1044ACN8#PBF?
LTC1044ACN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1044ACN8#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 LTC1044ACN8#PBF?
For technical support, including LTC1044ACN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1044ACN8#PBF requirements.
6.How does Aetrix verify that LTC1044ACN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1044ACN8#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 LTC1044ACN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1044ACN8#PBF?
All LTC1044ACN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1044ACN8#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 LTC1044ACN8#PBF part is unused and in its original packaging.
Return procedure for LTC1044ACN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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