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Analog Devices Inc. LTC1044CS8#PBF
- Part No.:
- LTC1044CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1044CS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP INV 20MA 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1044CS8#PBF from Analog Devices is a monolithic CMOS switched-capacitor voltage converter in 8-lead SOIC package, supporting voltage inversion (VOUT = –VIN), doubling (VOUT = 2VIN), division (VOUT = VIN/2), and multiplication. It operates from 1.5V to 9V supply, delivers ≤200µA no-load supply current at 5V, achieves ≥97% open-circuit voltage conversion efficiency, and features a BOOST pin (Pin 1) to raise internal oscillator frequency by ~7× for lower output impedance - used in precision analog front-ends and dual-rail power generation from single batteries.
For engineers reviewing the LTC1044CS8#PBF datasheet, LTC1044CS8#PBF pinout, LTC1044CS8#PBF application, or LTC1044CS8#PBF equivalent, key selection criteria include guaranteed 1.5–9V operation without external diodes, ±20ppm precision voltage division capability, BOOST-enabled frequency scaling, 80Ω typical output resistance at 5kHz, and compatibility with legacy ICL7660 designs while delivering lower quiescent current and extended temperature range.
Technical Context
The LTC1044CS8#PBF implements a fully integrated switched-capacitor architecture with internal CMOS switches, oscillator, and logic control - eliminating need for external timing resistors or diodes across its full 1.5V–9V supply range. Its BOOST pin directly modulates oscillator charge/discharge current to scale switching frequency up to ~35kHz (from base ~5kHz), enabling dynamic optimization of output impedance and ripple under varying load conditions.
Internal LV (Pin 6) logic rail is auto-switched to GND when V+ ≥ 3V, simplifying biasing; OSC (Pin 7) supports external clocking or capacitor-based frequency tuning. The device's output behavior follows REQUIV ≈ 1/(fOSC × C1), making output resistance inversely proportional to both oscillator frequency and flying capacitor value - a deterministic relationship confirmed across load, temperature, and supply voltage sweeps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 9V - enables direct operation from two alkaline/mercury/NiCd cells or single Li-ion cell without external protection diodes. |
| No-Load Supply Current | ≤200 µA at 5V - ensures ultra-low standby power in battery-powered instrumentation and portable sensors. |
| Voltage Conversion Efficiency | ≥97% open-circuit - minimizes energy loss during polarity inversion or division, critical for high-accuracy reference generation. |
| Output Resistance | 80 Ω at V+ = 5V, fOSC = 5kHz, C1 = C2 = 10µF - defines load regulation error and ripple under 10–15mA loads in analog signal chains. |
| Oscillator Frequency | ~5 kHz (base), up to ~35 kHz with BOOST pin tied to V+ - allows trade-off between efficiency (lower f) and output impedance (higher f). |
| Voltage Division Accuracy | VOUT = VIN/2 ±20 ppm - enables ultra-precision mid-rail generation for ratiometric ADCs and bridge sensor interfaces. |
| Operating Temperature | –40°C to +85°C - qualified for commercial industrial environments including automotive cabin electronics and medical handhelds. |
Pinout & Package
Package: 8-lead SOIC (Small Outline Integrated Circuit), 150 mil width, RoHS-compliant lead-free finish (PBF). Pin pitch: 1.27 mm. Body dimensions: 4.9 mm × 3.9 mm × 1.75 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pin 8) | Positive Supply Input | Primary power rail input; accepts 1.5V–9V; powers internal oscillator, switches, and logic. |
| OSC (Pin 7) | Oscillator Timing Node | Connects to external capacitor (COSC) to set base frequency; can be driven by external CMOS clock source. |
| LV (Pin 6) | Logic Voltage Reference | Internally shorted to GND when V+ ≥ 3V; must be externally grounded if V+ < 3V to ensure proper logic operation. |
| VOUT (Pin 5) | Converted Output Terminal | Delivers inverted, doubled, halved, or multiplied voltage; output impedance varies with fOSC and C1 value. |
| BOOST (Pin 1) | Oscillator Frequency Boost Control | Tying to V+ increases oscillator current ~7×, raising fOSC to optimize output impedance for higher loads. |
| CAP+ (Pin 2) | Flying Capacitor Positive Terminal | Connects to one terminal of flying capacitor C1; alternately charged/discharged to transfer energy. |
| GND (Pin 3) | Ground Reference | System ground return; serves as reference for LV logic and output common in split-supply configurations. |
| CAP– (Pin 4) | Flying Capacitor Negative Terminal | Connects to second terminal of flying capacitor C1; completes charge-transfer path during switching cycle. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-for-pin & functional compatibility with ICL7660 | Enables drop-in replacement in existing 7660 designs without PCB or schematic changes. |
| Diode-free operation up to 9V over full temperature range | Eliminates BOM cost and board space for external protection diodes in battery-powered systems. |
| BOOST pin for dynamic oscillator frequency scaling | Allows real-time adjustment of output impedance and ripple via single control pin - no external components needed. |
| Ultra-low quiescent current (≤200 µA at 5V) | Extends battery life in always-on sensor nodes and portable test equipment requiring long-term stability. |
| Precision voltage division (±20 ppm) | Supports metrology-grade ratiometric measurements in strain gauge bridges and precision DAC references. |
Applications
| Portable Instrumentation Power | Strain Gauge Signal Conditioning |
|---|---|
|
Use Scenario: Generating ±5V rails from a single 9V alkaline battery in handheld multimeters and portable oscilloscopes. IC Role / Device Role / Timing Role: Voltage inverter and splitter - converts V+ to symmetric ±V+/2 outputs referenced to system ground. Use Value: Enables rail-to-rail op-amp operation and ADC reference splitting without inductors or transformers, reducing EMI and size. |
Use Scenario: Providing low-noise, stable –5V bias for Wheatstone bridge excitation and instrumentation amplifier inputs. IC Role / Device Role / Timing Role: Precision negative voltage generator - delivers regulated –V+ with <80Ω output impedance at 5kHz switching. Use Value: Maintains bridge balance accuracy and minimizes offset drift in pressure transducers operating at <100nA load currents. |
| Low-Power Sensor Biasing | Ratiometric ADC Reference Splitting |
|
Use Scenario: Biasing MEMS accelerometers and analog temperature sensors requiring isolated negative supply in IoT edge nodes. IC Role / Device Role / Timing Role: Low-quiescent-current inverter - supplies –3.3V from 3.3V rail with ≤200µA IS at no load. Use Value: Extends coin-cell battery life beyond 5 years in wireless sensor networks while maintaining sensor full-scale linearity. |
Use Scenario: Creating precise VREF/2 and –VREF/2 for dual-supply SAR ADCs in medical diagnostic devices. IC Role / Device Role / Timing Role: Ultra-precision divider - achieves ±20ppm division accuracy independent of load below 100nA. Use Value: Eliminates gain error in ratiometric measurements where ADC reference and sensor excitation share same source. |
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 (up to 1.2mA), no BOOST pin, requires external diode above 6.5V, only rated to 6V max. | Legacy designs with fixed 5V rails and no demand for extended voltage range or dynamic frequency control. | Select only for cost-sensitive, non-battery applications where 6V max supply and higher IS are acceptable. |
| MAX1044CPA+ | Same pinout and function, but specifies 1.5–6V range (not 9V), 300µA max IS, and no guaranteed ±20ppm division accuracy. | General-purpose voltage inversion where precision division or >6V operation is not required. | Prefer LTC1044CS8#PBF when operating above 6V, requiring <200µA IS, or needing metrology-grade division. |
Compared with ICL7660CPA+ and MAX1044CPA+, the LTC1044CS8#PBF uniquely supports 9V operation without diodes, delivers 3.5× lower quiescent current, and guarantees ±20ppm division accuracy - making it the only choice for high-precision, wide-supply, battery-critical applications.
Availability
LTC1044CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation power, strain gauge signal conditioning, low-power sensor biasing, ratiometric ADC reference splitting, and battery-splitter circuits requiring stable component supply across industrial and medical product lifecycles.
Supply support for LTC1044CS8#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 LTC1044CS8#PBF belongs to Analog Devices' Linear Technology switched-capacitor converter product line, designed specifically for compact, inductorless DC/DC conversion in space-constrained, low-noise, and battery-operated systems.
FAQ
What voltage conversion functions does the LTC1044CS8#PBF support?
The LTC1044CS8#PBF supports four primary voltage conversion modes: inversion (VOUT = –VIN), doubling (VOUT = 2VIN), precise division (VOUT = VIN/2 ±20ppm), and multiplication (VOUT = ±nVIN). These are achieved using external flying capacitors and internal CMOS switches controlled by an on-chip oscillator. The LTC1044CS8#PBF does not require external diodes or resistors to configure these functions, and all modes operate reliably across its full 1.5V–9V supply range and –40°C to +85°C temperature span.
Can the LTC1044CS8#PBF replace an ICL7660 in an existing design?
Yes, the LTC1044CS8#PBF is pin-for-pin and functionally compatible with the ICL7660, allowing direct substitution without PCB or schematic modifications. It improves upon the 7660 with guaranteed 1.5–9V operation without external diodes, ≤200µA no-load supply current (vs. up to 1.2mA for 7660), and a BOOST pin to increase oscillator frequency. The LTC1044CS8#PBF maintains identical pin assignments and basic application circuits, ensuring seamless integration into legacy 7660 layouts.
What is the role of the BOOST pin (Pin 1) on the LTC1044CS8#PBF?
The BOOST pin (Pin 1) on the LTC1044CS8#PBF controls internal oscillator charge current: tying it to V+ increases oscillator frequency by approximately seven times (e.g., from ~5kHz to ~35kHz), which lowers effective output resistance and reduces voltage ripple under load. This enables dynamic optimization of performance without adding external components. Leaving BOOST open retains the base frequency. The LTC1044CS8#PBF datasheet confirms this behavior is monotonic and repeatable across temperature and supply voltage.
Does the LTC1044CS8#PBF require external diodes for 9V operation?
No, the LTC1044CS8#PBF does not require external diodes for operation up to 9V across its full –40°C to +85°C temperature range. This is enabled by Analog Devices' enhanced LTCMOS™ silicon gate process and improved internal circuit design, which eliminate latch-up and overvoltage risks present in earlier 7660 derivatives. The LTC1044CS8#PBF's absolute maximum supply voltage is 9.5V, and its electrical characteristics are fully specified and guaranteed at 9V - a key differentiator versus alternatives like the ICL7660 or MAX1044.
What is the precision of the LTC1044CS8#PBF's voltage division mode?
The LTC1044CS8#PBF achieves voltage division with VOUT = VIN/2 ±20ppm accuracy under no-load conditions, as explicitly specified in the "Applications Information" section of its official datasheet. This precision is maintained across temperature and supply voltage variations and is enabled by matched internal switch timing and low-drift capacitor charge transfer. The LTC1044CS8#PBF's ±20ppm division accuracy makes it suitable for metrology-grade applications such as ratiometric ADC references and precision bridge sensor excitation where gain error must remain below 0.002%.
LTC1044CS8#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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1044CS8#PBF FAQ
1.How can I place an order for LTC1044CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1044CS8#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 LTC1044CS8#PBF reliable?
The price and inventory of LTC1044CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1044CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1044CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1044CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1044CS8#PBF?
LTC1044CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1044CS8#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 LTC1044CS8#PBF?
For technical support, including LTC1044CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1044CS8#PBF requirements.
6.How does Aetrix verify that LTC1044CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1044CS8#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 LTC1044CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1044CS8#PBF?
All LTC1044CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1044CS8#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 LTC1044CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1044CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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