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Analog Devices Inc. LTC1044ACS8#PBF
- Part No.:
- LTC1044ACS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1044ACS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP INV 20MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:790
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Product details
Overview
LTC1044ACS8#PBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter in 8-lead SOIC package, supporting 1.5V–12V input and delivering inverted (–VIN), doubled (2VIN), halved (VIN/2), or multiplied (±nVIN) outputs without inductors. It features 97% open-circuit voltage conversion efficiency, 200µA max no-load supply current at 5V, and boost pin for 7× oscillator frequency scaling - used in precision analog power rails, battery-powered instrumentation, and dual-supply generation from single sources.
For engineers reviewing the LTC1044ACS8#PBF datasheet, LTC1044ACS8#PBF pinout, LTC1044ACS8#PBF application, or LTC1044ACS8#PBF equivalent, key selection criteria include its 12V absolute maximum rating, 80Ω typical output resistance at 10kHz, OSC/BOOST pin programmability, –40°C to 85°C industrial temperature range variant (LTC1044AIS8#PBF), and compatibility with low-ESR aluminum/tantalum capacitors.
Technical Context
The LTC1044ACS8#PBF implements a four-phase switched-capacitor topology with internal MOSFET switches controlled by a self-timed oscillator. Its LV pin enables logic-level optimization for V+ ≥ 3V, while BOOST pin raises internal clock frequency by ~7× when tied to V+, reducing output impedance and ripple under load.
Oscillator frequency is user-adjustable via external capacitor on OSC (Pin 7) and BOOST (Pin 1), enabling trade-offs between capacitor size, output impedance, and power efficiency. Internal oscillator disable (OSC = GND or V+) reduces supply current to 1.5µA, supporting ultra-low-power standby modes in portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply 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 >1-year battery life in low-duty-cycle sensor nodes using 200mAh coin cells. |
| Voltage Conversion Efficiency | ≥97% (open-circuit) - minimizes thermal rise and extends runtime in space-constrained PCB layouts. |
| Output Resistance | 80Ω at fOSC = 10kHz, C1 = C2 = 10µF - delivers ≤0.8V drop at 10mA load, suitable for op-amp biasing and reference splitting. |
| Oscillator Frequency Range | 1kHz to 20kHz (adjustable via COSC and BOOST) - allows capacitor downsizing: 1µF caps viable at 20kHz vs 10µF at 5kHz. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control, test equipment, and consumer audio interfaces. |
| Absolute Max Rating | 13V supply - provides 1V headroom above 12V operation, preventing latch-up during transient overvoltage events. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 150-mil width, JEDEC MS-012AC compliant, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency multiplier control | Tie to V+ to increase internal clock frequency ~7×; leave open for nominal frequency - enables smaller external capacitors and lower output impedance. |
| 2 (CAP+) | Positive flying capacitor terminal | Connects to one plate of C1; switching node for charge transfer - requires low-ESR capacitor (e.g., 10µF tantalum) with <100mΩ ESR. |
| 3 (GND) | Power and signal reference ground | Common return for V+, VOUT, CAP−, and LV; must be low-impedance plane to minimize noise coupling into sensitive analog circuits. |
| 4 (CAP−) | Negative flying capacitor terminal | Connects to second plate of C1; complements CAP+ in charge-pump cycle - polarity-sensitive for inverting/doubling topologies. |
| 5 (VOUT) | Regulated output voltage node | Delivers inverted (–VIN), doubled (2VIN), or divided (VIN/2) output; output impedance varies with fOSC and C1 value. |
| 6 (LV) | Logic voltage reference input | Internally shorted to GND when V+ ≥ 3V; tie externally to GND if V+ < 3V - ensures proper internal logic level translation. |
| 7 (OSC) | External oscillator timing node | Connects to external capacitor (0–100pF) to set base frequency; driven by internal Schmitt trigger - TTL/CMOS logic compatible. |
| 8 (V+) | Main power supply input | Accepts 1.5V–12V DC; powers all internal circuitry and flying capacitor charge cycles - bypass with 0.1µF ceramic near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless voltage conversion | Eliminates magnetic components, EMI, and board area - ideal for compact medical sensors and portable test gear. |
| Programmable oscillator frequency | Adjustable 1kHz–20kHz range via OSC pin capacitor and BOOST pin - enables optimization of capacitor size vs. output regulation. |
| Ultra-low quiescent current mode | 1.5µA supply current when OSC pin tied to GND/V+ - extends shelf life and enables wake-on-event architectures. |
| Precision voltage division (VIN/2) | ±20ppm accuracy with IL < 100nA - supports ratiometric ADC references and high-resolution bridge excitation. |
| High-voltage upgrade path | Replaces ICL7660/LTC1044 with +2V higher max input (12V vs. 10V) and improved efficiency - drop-in upgrade for legacy designs. |
Applications
| Portable Instrumentation Power | Analog Signal Conditioning |
|---|---|
Use Scenario: Handheld multimeter generating ±3.3V rails from a single 9V alkaline battery for dual-supply op-amps and ADC references. IC Role / Device Role / Timing Role: Voltage splitter and inverter providing symmetrical analog supply rails with minimal load regulation error. Use Value: Enables rail-to-rail input/output operation of precision amplifiers without discrete regulators or inductors - saving >12mm² PCB area. |
Use Scenario: Strain gauge bridge amplifier requiring stable –5V bias for offset nulling and common-mode rejection. IC Role / Device Role / Timing Role: Inverting converter supplying clean negative rail synchronized to main system clock via OSC pin. Use Value: Delivers ≤0.02% load regulation from 0–15mA, eliminating drift in microvolt-level bridge measurements. |
| Battery-Powered Sensor Nodes | Low-Power Reference Generation |
Use Scenario: IoT temperature sensor using CR2032 coin cell (3V) to generate –1.5V for rail-splitting ADC reference and op-amp bias. IC Role / Device Role / Timing Role: Halving converter (VOUT = VIN/2) operating at 1kHz with OSC pin grounded for ultra-low IS. Use Value: Achieves 1.5µA shutdown current, enabling >5-year battery life at 1-sample-per-minute duty cycle. |
Use Scenario: Precision voltage reference divider for 16-bit SAR ADC, requiring ±0.002% accuracy and <100nA load current. IC Role / Device Role / Timing Role: Ultra-precision divider (VOUT = V+/2 ±20ppm) with dedicated low-leakage capacitor path. Use Value: Matches LT1004 1.2V reference tolerance without trimming - reduces BOM count and calibration steps. |
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+ | Same pinout, 1.5V–12V range, but 250µA max IS and no BOOST pin - fixed 10kHz oscillator only. | Lacks frequency scaling; cannot reduce capacitor size or improve load regulation beyond nominal spec. | Select when design uses fixed 10kHz operation and 10µF caps are acceptable; verify layout for higher IS-induced thermal rise. |
| ICL7660ACPA+ | Legacy part: 1.5V–10V max, 170µA IS, no BOOST, no LV pin - not a direct replacement for 12V or low-VIN (<3V) use. | Cannot replace LTC1044ACS8#PBF in 12V systems or sub-3V battery apps without redesign. | Only consider for cost-sensitive, non-upgraded legacy repairs where 10V max and fixed frequency are acceptable. |
Compared with MAX1044CPA+ and ICL7660ACPA+, the LTC1044ACS8#PBF offers superior flexibility via BOOST/OSC control, tighter voltage conversion efficiency (97% vs. 92%), and guaranteed 12V operation - making it the preferred choice for new designs requiring dynamic power optimization.
Availability
LTC1044ACS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, analog signal conditioning, battery-powered sensor nodes, and low-power reference generation requiring stable component supply across commercial temperature grades.
Supply support for LTC1044ACS8#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, inheriting its precision analog portfolio. Linear pioneered high-performance switched-capacitor ICs for power management and signal conditioning.
The LTC1044A product line was designed specifically for inductorless DC/DC conversion in space- and noise-constrained analog systems - targeting instrumentation, medical devices, and portable test equipment needing clean, flexible dual-rail generation.
FAQ
What is the maximum input voltage the LTC1044ACS8#PBF can handle?
The LTC1044ACS8#PBF has an absolute maximum supply voltage rating of 13V, with guaranteed operation up to 12V across its full 0°C to 70°C temperature range. Exceeding 13V risks permanent damage due to internal latch-up, per Absolute Maximum Ratings. The 12V operational limit makes it suitable for 9V wall adapters, automotive accessory circuits, and upgraded replacements for 10V-rated ICL7660 designs.
How does the BOOST pin affect performance of the LTC1044ACS8#PBF?
Tying the BOOST pin (Pin 1) of the LTC1044ACS8#PBF to V+ increases the internal oscillator frequency by approximately seven times. This reduces output impedance (e.g., from ~200Ω to ~80Ω at 10mA) and output voltage ripple, enabling smaller external flying capacitors (e.g., 1µF instead of 10µF). It does not alter conversion ratio or efficiency ceiling - those remain governed by load, capacitor ESR, and switching losses.
Can the LTC1044ACS8#PBF generate a precise half-input voltage?
Yes - the LTC1044ACS8#PBF supports ultra-precision voltage division with VOUT = V+/2 ±20ppm accuracy when load current is kept below 100nA. This is achieved using matched internal switching and low-drift charge transfer. For higher loads, output impedance causes deviation; a 10kΩ load introduces ~0.8mV error at 12V input. Applications include ratiometric ADC references and bridge excitation where matching to primary supply is critical.
What capacitor types are recommended for use with the LTC1044ACS8#PBF?
Aluminum or tantalum electrolytic capacitors are explicitly recommended for C1 and C2 in the LTC1044ACS8#PBF datasheet - they offer optimal cost, size, and ESR performance. Ceramic capacitors are discouraged due to microphonic effects and voltage coefficient errors. For 10µF values at 10kHz, 10V-rated tantalum (e.g., AVX TAJ series) with <100mΩ ESR ensures stable operation and meets the 80Ω output resistance spec. Capacitor matching is not required.
Is the LTC1044ACS8#PBF pin-compatible with the older LTC1044CN8?
Yes - the LTC1044ACS8#PBF shares identical pinout and electrical behavior with the LTC1044CN8 (DIP-8) and LTC1044CS8 (SO-8), differing only in process enhancements and extended 12V operation. It is a direct drop-in replacement for ICL7660-based designs requiring higher input voltage, lower quiescent current, or improved efficiency. No PCB changes are needed when upgrading from LTC1044CS8 or LTC1044CN8 to LTC1044ACS8#PBF.
LTC1044ACS8#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):
- 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#PBF FAQ
1.How can I place an order for LTC1044ACS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1044ACS8#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 LTC1044ACS8#PBF reliable?
The price and inventory of LTC1044ACS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1044ACS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1044ACS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1044ACS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1044ACS8#PBF?
LTC1044ACS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1044ACS8#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 LTC1044ACS8#PBF?
For technical support, including LTC1044ACS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1044ACS8#PBF requirements.
6.How does Aetrix verify that LTC1044ACS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1044ACS8#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 LTC1044ACS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1044ACS8#PBF?
All LTC1044ACS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1044ACS8#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 LTC1044ACS8#PBF part is unused and in its original packaging.
Return procedure for LTC1044ACS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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