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Analog Devices Inc. LTC1044ACS8#TRPBF
- Part No.:
- LTC1044ACS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1044ACS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP INV 20MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:6,712
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Product details
Overview
LTC1044ACS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter IC designed for inductorless DC/DC conversion. It performs voltage inversion (VOUT = –VIN), doubling (VOUT = 2VIN), division (VOUT = VIN/2 ±20ppm), and multiplication (VOUT = ±nVIN) with up to 12V input, 97% open-circuit voltage conversion efficiency, and 95% power conversion efficiency - used in precision analog supply generation and battery-powered instrumentation.
For engineers reviewing the LTC1044ACS8#TRPBF datasheet, LTC1044ACS8#TRPBF pinout, LTC1044ACS8#TRPBF application, or LTC1044ACS8#TRPBF equivalent, key selection criteria include its 1.5V–12V operating range, BOOST pin-enabled 7× oscillator frequency scaling, 200µA max no-load supply current at 5V, and SO-8 package compatibility with space-constrained industrial and portable designs.
Technical Context
The LTC1044ACS8#TRPBF implements a dual-phase switched-capacitor topology with internal MOSFET switches controlled by a self-contained oscillator. Its LV pin enables logic-level adaptation for V+ ≥3V operation, while the BOOST pin (Pin 1) increases internal charge/discharge current to raise switching frequency ~7× - reducing required external capacitor size and output impedance.
Oscillator frequency is user-adjustable via external capacitor on OSC (Pin 7) or external clock drive; 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 MOS switch RON at high frequencies, enabling design trade-offs between ripple, load regulation, and board area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 1.5V to 12V - supports single-cell Li-ion, 3.3V/5V logic rails, and 9V battery systems without external regulators. |
| Max Supply Current (No Load) | 200µA at 5V - enables ultra-low-quiescent-power operation in always-on sensor nodes. |
| Voltage Conversion Efficiency | ≥97% (open-circuit) - minimizes input-to-output voltage loss in precision reference splitting applications. |
| Power Conversion Efficiency | ≥95% at RL = 5kΩ, fOSC = 5kHz - ensures minimal thermal rise and extended battery life under moderate loads. |
| Oscillator Frequency Range | 1kHz to 20kHz (adjustable via COSC or BOOST pin) - allows optimization of output impedance (e.g., 60Ω at 10kHz, 200Ω at 1kHz) and capacitor size. |
| Output Resistance | 100Ω typical at V+ = 5V, IL = 20mA, fOSC = 5kHz - defines load regulation slope (~45Ω/mA in inverter mode) and maximum deliverable current. |
| Precision Voltage Division | VOUT = VIN/2 ±20ppm - enables ratiometric ADC biasing and ultra-stable mid-rail generation without trimming resistors. |
Pinout & Package
Package: 8-lead plastic SO (S8), narrow 0.150-inch body, RoHS-compliant, tape-and-reel (TRPBF). Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency multiplier control | Tying to V+ increases internal oscillator frequency ~7×, lowering output impedance and enabling smaller C1/C2 capacitors. |
| 2 (CAP+) | Positive flying capacitor terminal | Connects to one plate of external flying capacitor (C1); alternately charged/discharged during switching phases. |
| 3 (GND) | Ground reference and output common | System ground return path; output voltage referenced to this node in inverter/splitter configurations. |
| 4 (CAP−) | Negative flying capacitor terminal | Connects to second plate of C1; polarity reversal relative to CAP+ enables voltage inversion. |
| 5 (VOUT) | Regulated output terminal | Delivers inverted, doubled, or divided output; exhibits ~80Ω effective source impedance in standard inverter setup. |
| 6 (LV) | Logic voltage reference input | Internally shorted to GND when V+ ≥3V; must be externally tied to GND for V+ <3V to ensure proper logic level translation. |
| 7 (OSC) | Internal oscillator timing/control | Frequency set by external capacitor (0pF to 100pF); can be driven by external clock or disabled (tie to GND/V+) for ultra-low-IQ. |
| 8 (V+) | Positive supply input | Accepts 1.5V–12V input; absolute max rating is 13V; powers internal logic and switching circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless voltage conversion | Eliminates magnetic components, EMI concerns, and PCB area penalties associated with inductive DC/DC converters. |
| Configurable conversion modes | Single IC supports inverter (–VIN), doubler (+2VIN), splitter (±VIN/2), and divider (VIN/2 ±20ppm) topologies via external wiring. |
| BOOST pin frequency scaling | 7× oscillator boost reduces output impedance by ~7× and allows 7× smaller flying capacitors (e.g., 1.4µF instead of 10µF at same fOSC). |
| Ultra-low shutdown current | 1.5µA supply current when OSC pin tied to GND or V+, enabling microamp-level sleep modes in portable systems. |
| Wide temperature operation | Rated for 0°C to 70°C ambient (AC grade), supporting commercial and industrial environments without derating. |
Applications
| Portable Instrumentation Power | Precision ADC Reference Splitting |
|---|---|
|
Use Scenario: Generating clean ±5V rails from a single 10V lithium polymer battery in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: LTC1044ACS8#TRPBF acts as a dual-rail inverter/splitter, converting 10V input into symmetrical ±5V outputs referenced to system ground. Use Value: Achieves ±5V at 15mA with <0.02% load regulation and no inductors - critical for noise-sensitive front-end amplifiers and 16-bit SAR ADCs. |
Use Scenario: Creating a precise mid-supply reference (VIN/2) for ratiometric pressure transducer signal conditioning. IC Role / Device Role / Timing Role: LTC1044ACS8#TRPBF operates in ultra-precision divider mode, delivering VOUT = VIN/2 ±20ppm with <100nA load current. Use Value: Enables direct connection to LT1004 1.2V reference and A/D converter without resistor dividers or trimming - eliminating drift and matching errors. |
| Battery-Powered Sensor Nodes | Low-Voltage Microcontroller Peripherals |
|
Use Scenario: Powering op-amps and analog sensors from a 3.3V coin cell in wireless environmental monitors. IC Role / Device Role / Timing Role: LTC1044ACS8#TRPBF functions as a low-noise negative rail generator (–3.3V) using BOOST-enhanced 20kHz switching to minimize capacitor size. Use Value: Delivers –3.3V at 5mA with 60Ω output impedance and <10mV ripple - sufficient for rail-to-rail op-amps driving RF modules. |
Use Scenario: Providing isolated –5V bias for RS-232 line drivers in embedded controllers powered from 5V USB supplies. IC Role / Device Role / Timing Role: LTC1044ACS8#TRPBF serves as a compact inverter, replacing discrete charge-pump ICs with higher quiescent current. Use Value: Reduces BOM count by eliminating external diodes and regulators while maintaining 95% power efficiency at 10mA load. |
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 |
|---|---|---|---|
| MAX1044CPA+ | Pin-compatible but rated only to 6.5V max input; 250µA max IS at 5V; no BOOST pin; lower conversion efficiency (92% typical). | Not suitable for 9V/12V battery inputs or precision division; limited to 5V-only systems requiring basic inversion. | Select MAX1044CPA+ only if legacy pinout compatibility is mandatory and input voltage stays ≤6V. |
| LTC3260EMS8E#PBF | Low-noise, dual-output (±VOUT) charge pump with integrated LDOs; 4.5V–32V input; 12-lead MSOP; 20µA IQ. | Targets high-PSRR analog front-ends (e.g., medical EEG) where LTC1044ACS8#TRPBF's 80Ω output impedance is insufficient. | Choose LTC3260EMS8E#PBF when ultra-low noise (<10µVRMS) and regulated ±rails are required - not for cost-sensitive or space-constrained inverter-only use. |
Compared with MAX1044CPA+, LTC1044ACS8#TRPBF supports higher input voltage and offers BOOST-driven frequency scaling for better load regulation; compared with LTC3260EMS8E#PBF, it provides simpler, lower-cost inductorless conversion without LDO overhead - ideal for discrete rail generation where noise specs permit.
Availability
LTC1044ACS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation power, precision ADC reference splitting, battery-powered sensor nodes, and low-voltage microcontroller peripherals requiring stable component supply across production lifecycles.
Supply support for LTC1044ACS8#TRPBF 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 its precision analog portfolio. Linear pioneered high-performance switched-capacitor and DC/DC converter ICs for demanding industrial and instrumentation applications.
The LTC1044A product line was designed specifically for inductorless, high-accuracy DC voltage conversion in space- and cost-constrained systems - emphasizing precision division, low quiescent current, and flexible topology configuration without external magnetics.
FAQ
What is the absolute maximum supply voltage for the LTC1044ACS8#TRPBF?
The absolute maximum supply voltage for the LTC1044ACS8#TRPBF is 13V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. The device is rated for continuous operation up to 12V input, making it suitable for 9V wall adapters and 12V automotive auxiliary rails. Exceeding 13V - even transiently - may trigger destructive latchup.
Can the LTC1044ACS8#TRPBF generate a precise +5V and –5V output from a 10V input?
Yes, the LTC1044ACS8#TRPBF can generate ±5V from a 10V input using the battery splitter configuration shown in Figure 9 of the datasheet. In this mode, both outputs are referenced to Pin 3 (GND), delivering VOUT+ = +5V and VOUT– = –5V with matched accuracy. Load current should be limited to ≤10mA per rail to maintain regulation within ±0.02%, as verified in typical performance curves.
How does the BOOST pin (Pin 1) affect the performance of the LTC1044ACS8#TRPBF?
Tying the BOOST pin (Pin 1) of the LTC1044ACS8#TRPBF to V+ increases internal oscillator frequency by approximately 7×, which lowers output impedance and reduces voltage ripple under load. For example, at 10kHz operation with 10µF flying capacitors, output resistance drops from ~200Ω to ~60Ω - enabling higher load currents or smaller external capacitors. Leaving BOOST open defaults to standard frequency mode.
Is the LTC1044ACS8#TRPBF compatible with ceramic flying capacitors?
Yes, the LTC1044ACS8#TRPBF is fully compatible with X7R or X5R ceramic flying capacitors. While aluminum or tantalum electrolytics are recommended for cost and size in high-current applications, ceramics work reliably - especially when leveraging the BOOST pin to raise frequency. Ceramic capacitors reduce ESR-related losses and improve transient response, though capacitance tolerance (±10%–20%) must be accounted for in precision division mode.
What is the minimum load current required to maintain regulation in inverter mode?
The LTC1044ACS8#TRPBF does not require a minimum load current to maintain regulation - it operates stably from no load to full rated output. Typical performance graphs show output voltage deviation of <10mV from no load to 15mA in inverter mode (V+ = 10V). However, light-load efficiency drops due to fixed switching losses; for ultra-low-power standby, disable the oscillator by tying Pin 7 (OSC) to GND or V+ to reduce IS to 1.5µA.
LTC1044ACS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1044ACS8#TRPBF FAQ
1.How can I place an order for LTC1044ACS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1044ACS8#TRPBF 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 LTC1044ACS8#TRPBF reliable?
The price and inventory of LTC1044ACS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1044ACS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1044ACS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1044ACS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1044ACS8#TRPBF?
LTC1044ACS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1044ACS8#TRPBF 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 LTC1044ACS8#TRPBF?
For technical support, including LTC1044ACS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1044ACS8#TRPBF requirements.
6.How does Aetrix verify that LTC1044ACS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1044ACS8#TRPBF 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 LTC1044ACS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1044ACS8#TRPBF?
All LTC1044ACS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1044ACS8#TRPBF, 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 LTC1044ACS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1044ACS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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