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Analog Devices Inc. LTC1044CN8#PBF
- Part No.:
- LTC1044CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1044CN8#PBF.pdf
- Description:
- IC REG CHARG PUMP INV 20MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,023
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Product details
Overview
LTC1044CN8#PBF from Analog Devices is a monolithic CMOS switched-capacitor voltage converter in 8-lead PDIP package, supporting input inversion (VOUT = –VIN), doubling (VOUT = 2VIN), division (VOUT = VIN/2), and multiplication (VOUT = ±nVIN) without external diodes. It operates from 1.5V to 9V supply over 0°C to 70°C, delivers ≤200µA no-load supply current at 5V, and achieves ≥97% open-circuit voltage conversion efficiency - ideal for battery-powered precision analog rails and dual-supply generation in portable instrumentation.
For engineers reviewing the LTC1044CN8#PBF datasheet, LTC1044CN8#PBF pinout, LTC1044CN8#PBF application, or LTC1044CN8#PBF equivalent, this page provides verified functional identity, validated pin roles, confirmed temperature-limited operation (0°C to 70°C), exact package mapping (N8 PDIP), and two rigorously cross-checked alternative parts with documented technical and application differences.
Technical Context
The LTC1044CN8#PBF implements a charge-pump architecture using internal CMOS switches clocked by an on-chip oscillator whose frequency is user-adjustable via external capacitor (COSC) on Pin 7 and BOOST control on Pin 1. Its logic core runs between V+ and LV (Pin 6), with LV internally shorted to GND when V+ ≥ 3V.
It supports four fundamental topologies: inverting, doubling, halving, and multiplying configurations - all requiring only two external capacitors (C1, C2). Output impedance is dominated by 1/(f·C1) at low frequencies and switch on-resistance at high frequencies, enabling predictable load regulation down to 80Ω at 5kHz with 10µF capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 9V - enables direct operation from single alkaline, mercury, or NiCad batteries without external protection diodes. |
| No-Load Supply Current | ≤200µA at 5V - ensures ultra-low quiescent power for long-life battery applications. |
| Voltage Conversion Efficiency | ≥97% open-circuit - minimizes energy loss during rail generation in low-power analog signal chains. |
| Power Conversion Efficiency | ≥95% at RL = 5kΩ - maintains high efficiency under moderate load conditions typical of op-amp biasing. |
| Oscillator Frequency Range | 1kHz to 5kHz (standard); up to ~35kHz with BOOST pin - allows trade-off between ripple reduction and switching loss. |
| Output Resistance | 80Ω typical at 5V/5kHz - defines load regulation slope (e.g., 0.8V drop at 10mA), critical for stable reference generation. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for consumer, industrial, and medical portable equipment. |
Pinout & Package
Package: 8-Lead PDIP (N8), narrow body, 0.300-inch width, lead pitch 0.100 inch. RoHS-compliant lead finish (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 8) | Positive supply input | Accepts 1.5V–9V DC; powers internal oscillator and switches; case not connected in PDIP variant. |
| OSC (Pin 7) | Oscillator timing node | Connects external capacitor (COSC) to set base frequency; driven externally for synchronous operation. |
| LV (Pin 6) | Logic voltage reference | Internally shorted to GND when V+ ≥ 3V; must be tied to GND if V+ < 3V to ensure reliable startup. |
| VOUT (Pin 5) | Regulated output terminal | Delivers inverted, doubled, or divided voltage; output impedance ≈80Ω at 5kHz determines load regulation. |
| BOOST (Pin 1) | Oscillator boost control | Connecting to V+ increases oscillator current and raises fOSC ~7× - reduces output impedance for higher loads. |
| CAP+ (Pin 2) | Positive flying capacitor node | Connects to C1 anode in inverting/doubling topologies; carries full switching current during charge transfer. |
| GND (Pin 3) | Circuit ground reference | System common return; LV pin shares this node when active; critical for noise rejection in precision rails. |
| CAP– (Pin 4) | Negative flying capacitor node | Connects to C1 cathode; forms charge-transfer path with CAP+; floating in halving configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-for-pin compatibility with ICL7660 | Enables drop-in replacement in legacy designs without PCB modification or layout change. |
| Diodeless operation up to 9V | Eliminates external protection diode requirement across full temperature range - reduces BOM count and board space. |
| Boost-controlled oscillator | Pin 1 connection to V+ raises fOSC ~7×, lowering output impedance and ripple for demanding analog loads. |
| Precision voltage division (±20ppm) | Supports ultra-stable VOUT = VIN/2 with minimal drift - suitable for ratiometric sensor interfaces and reference splitting. |
| Low quiescent current (≤200µA) | Extends battery life in always-on portable systems such as handheld meters and wearable health monitors. |
Applications
| Portable Instrumentation Power | Strain Gauge Signal Conditioning |
|---|---|
Use Scenario: Generating ±5V rails from a single 9V alkaline battery in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Voltage inverter and doubler providing isolated, low-noise analog supply rails for op-amps and ADCs. Use Value: Eliminates need for external diodes and enables stable dual-rail operation over full battery discharge curve (9V → 4.5V). |
Use Scenario: Biasing a Wheatstone bridge transducer and powering associated instrumentation amplifiers in pressure sensors. IC Role / Device Role / Timing Role: Precision voltage splitter delivering symmetrical ±V+/2 rails referenced to bridge mid-point. Use Value: Achieves ratiometric accuracy better than ±0.002% with load currents <100nA - essential for high-resolution strain measurement. |
| Battery-Powered Medical Devices | Low-Power Sensor Node Supplies |
Use Scenario: Creating negative bias for ECG front-end amplifiers and positive doubled rail for LCD drivers in portable patient monitors. IC Role / Device Role / Timing Role: Dual-mode converter operating in inversion and doubling modes simultaneously via shared flying capacitors. Use Value: Delivers regulated ±4.5V from 4.5V input with <200µA quiescent draw - extends operating time between battery replacements. |
Use Scenario: Generating clean ±3.3V supplies for low-noise MEMS accelerometers and RF transceivers in wireless IoT nodes. IC Role / Device Role / Timing Role: Low-ripple voltage inverter synchronized to system clock via OSC pin to minimize EMI coupling. Use Value: Reduces output impedance to <60Ω using BOOST + 100pF COSC - suppresses switching noise in sensitive analog signal paths. |
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 | Higher quiescent current (500µA max), no BOOST pin, requires external diode above 6.5V, narrower temp range (0°C to 70°C). | Compatible in basic inverting circuits but lacks efficiency and flexibility for battery-critical or high-precision division applications. | Select only for cost-sensitive legacy replacements where BOOST and diodeless operation are unnecessary. |
| LTC1044CS8#PBF | Same functionality and pinout, but SO-8 package and extended temperature range (–40°C to 85°C); identical electrical specs. | Preferred for new designs requiring surface-mount assembly, thermal robustness, or automotive-adjacent environments. | Choose for modern PCB layouts needing reflow compatibility and wider ambient tolerance - no circuit redesign needed. |
Compared with ICL7660CPA, LTC1044CN8#PBF delivers 2.5× lower quiescent current and eliminates diode dependency; compared with LTC1044CS8#PBF, it trades SO-8 reflow capability for through-hole manufacturability and lower cost in low-volume prototyping.
Availability
LTC1044CN8#PBF is available at Aetrix Electronics and suitable for portable instrumentation power, strain gauge signal conditioning, battery-powered medical devices, and low-power sensor node supplies requiring stable component supply across commercial temperature grades.
Supply support for LTC1044CN8#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 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 LTC1044 belongs to Analog Devices' legacy Linear Technology switched-capacitor converter product line, designed specifically for low-power, diodeless rail generation in space-constrained and battery-operated systems.
FAQ
What is the maximum supply voltage supported by the LTC1044CN8#PBF?
The LTC1044CN8#PBF supports a maximum supply voltage of 9V across its full operating temperature range (0°C to 70°C), with absolute maximum rating at 9.5V. Unlike earlier 7660 variants, it achieves this without requiring external protection diodes due to enhanced internal CMOS process design - confirmed in the Absolute Maximum Ratings table and Applications Information section of the official datasheet.
Does the LTC1044CN8#PBF require external diodes for operation above 6.5V?
No, the LTC1044CN8#PBF does not require external diodes for operation up to 9V. This diodeless capability is enabled by improvements in Analog Devices' silicon gate CMOS process and internal circuit design, explicitly stated in the Applications Information section and validated across the full 0°C to 70°C temperature range - a key differentiator from the ICL7660.
What is the function of the BOOST pin (Pin 1) on the LTC1044CN8#PBF?
The BOOST pin (Pin 1) on the LTC1044CN8#PBF increases internal oscillator drive current, raising the switching frequency by approximately seven times when connected to V+. This reduces output impedance and ripple - critical for higher load currents - and is fully documented in the Oscillator section and Figure 5 of the official datasheet.
Can the LTC1044CN8#PBF generate precise VOUT = VIN/2?
Yes, the LTC1044CN8#PBF supports ultra-precision voltage division with VOUT = VIN/2 ±20ppm, as specified in the FEATURES list and demonstrated in Figure 9 (Ultra Precision Voltage Divider). This performance requires load current ≤100nA and proper capacitor selection - confirmed in the Applications Information section.
What is the operating temperature range of the LTC1044CN8#PBF?
The LTC1044CN8#PBF is rated for 0°C to 70°C operation, as defined in the Ordering Information table under "LTC1044CN8#PBF" and confirmed in the Absolute Maximum Ratings section. This commercial-grade temperature range distinguishes it from the C-grade (–40°C to 85°C) and M-grade (–55°C to 125°C) variants.
LTC1044CN8#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):
- 9V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 20mA
- Frequency - Switching:
- 1kHz ~ 5kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1044CN8#PBF FAQ
1.How can I place an order for LTC1044CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1044CN8#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 LTC1044CN8#PBF reliable?
The price and inventory of LTC1044CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1044CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1044CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1044CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1044CN8#PBF?
LTC1044CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1044CN8#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 LTC1044CN8#PBF?
For technical support, including LTC1044CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1044CN8#PBF requirements.
6.How does Aetrix verify that LTC1044CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1044CN8#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 LTC1044CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1044CN8#PBF?
All LTC1044CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1044CN8#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 LTC1044CN8#PBF part is unused and in its original packaging.
Return procedure for LTC1044CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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