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Analog Devices Inc. LTC1044CS8#TRPBF
- Part No.:
- LTC1044CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1044CS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP INV 20MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,328
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Product details
Overview
LTC1044CS8#TRPBF 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 (VOUT = ±nVIN) without external diodes across 1.5V–9V supply. It delivers ≤200 µA no-load supply current at 5V, ≥97% open-circuit voltage conversion efficiency, and features a BOOST pin (Pin 1) to raise internal oscillator frequency by ~7× for lower output impedance under load.
For engineers reviewing the LTC1044CS8#TRPBF datasheet, LTC1044CS8#TRPBF pinout, LTC1044CS8#TRPBF application, or LTC1044CS8#TRPBF equivalent, this device serves as a drop-in functional replacement for the ICL7660 with enhanced temperature range, lower quiescent current, and improved 9V operation - critical for battery-powered precision analog rails, dual-supply generation, and low-power sensor signal conditioning.
Technical Context
The LTC1044CS8#TRPBF implements a fully integrated switched-capacitor architecture with internal CMOS switches, oscillator, and logic control - eliminating need for external timing components in basic configurations. Its LV pin (Pin 6) is internally shorted to GND when V+ ≥ 3V, enabling automatic logic-level adaptation.
Oscillator frequency defaults to ~5 kHz at V+ = 5V with COSC = 1 pF, but scales with external capacitor on Pin 7 and can be boosted up to ~35 kHz via Pin 1 tied to V+. Output resistance is dominated by 1/(f·C₁) term, yielding ~80 Ω at 5 kHz with 10 µF capacitors - directly enabling stable ±5V generation from single 5V rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 9V - supports mercury, alkaline, or NiCd 9V batteries without external protection diodes. |
| No-Load Supply Current | ≤200 µA at 5V - enables multi-year battery life in low-duty-cycle instrumentation. |
| Voltage Conversion Efficiency | ≥97% open-circuit - minimizes input power loss during rail generation for precision analog stages. |
| Power Conversion Efficiency | ≥95% at RL = 5 kΩ - ensures high energy transfer under typical load conditions. |
| Oscillator Frequency (default) | ~5 kHz at V+ = 5V, COSC = 1 pF - balances ripple, efficiency, and capacitor size for general-purpose use. |
| BOOST Function Gain | ~7× frequency increase when Pin 1 = V+ - reduces effective output impedance for higher load currents. |
| Output Resistance | ~80 Ω at 5 kHz, C₁ = C₂ = 10 µF - defines load regulation slope (e.g., 0.8 V drop at 10 mA). |
Pinout & Package
Package: 8-lead SOIC (Small Outline Integrated Circuit), 150 mil width, RoHS-compliant lead-free finish. Pin spacing conforms to JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency control input | Tie to V+ to increase switching frequency ~7×; leave open for default operation. |
| 2 (OSC) | Oscillator timing node | Connect external capacitor (1 pF typical) to set base frequency; can be driven externally. |
| 3 (GROUND) | Reference ground terminal | Common return for all internal logic and charge-transfer paths; must be low-impedance. |
| 4 (CAP–) | Negative flying capacitor terminal | Connects to negative plate of C₁; forms charge-transfer path during inversion/doubling cycles. |
| 5 (VOUT) | Regulated output terminal | Delivers inverted, doubled, or divided voltage; output impedance ~80 Ω at 5 kHz. |
| 6 (LV) | Logic voltage reference | Internally shorted to GND when V+ ≥ 3V; tie to GND for V+ < 3V to ensure startup. |
| 7 (CAP+) | Positive flying capacitor terminal | Connects to positive plate of C₁; completes charge-transfer loop with CAP– and VOUT. |
| 8 (V+) | Positive supply input | Accepts 1.5V–9V; powers internal oscillator, switches, and logic; case is not connected. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-for-pin compatibility with ICL7660 | Enables direct upgrade in legacy designs without PCB changes or layout revision. |
| Diodeless 9V operation over full temperature range | Eliminates external protection diode requirement - simplifies BOM and improves reliability. |
| 2.5× lower quiescent current vs 7660 | Extends battery life in portable medical, sensor, and metering applications requiring long standby. |
| Precision voltage division (±20 ppm) | Supports ultra-stable reference splitting for ratiometric ADC interfaces and bridge excitation. |
| Configurable oscillator via BOOST and OSC pins | Allows dynamic optimization of output impedance and ripple for varying load profiles. |
Applications
| Portable Instrumentation Power | Precision Sensor Signal Conditioning |
|---|---|
Use Scenario: Generating clean ±5V rails from a single 5V Li-ion cell in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Voltage inverter and doubler providing isolated analog supply domains for op-amps and ADCs. Use Value: Eliminates need for inductive DC/DC converters - avoids EMI, reduces board area, and maintains low noise floor. |
Use Scenario: Biasing strain gauge bridges and powering low-noise instrumentation amplifiers in industrial pressure transducers. IC Role / Device Role / Timing Role: Precision voltage splitter delivering symmetrical ±VS/2 rails referenced to common ground. Use Value: Achieves ±20 ppm division accuracy - enables ratiometric measurement with <0.002% gain error drift. |
| Battery-Powered Medical Sensors | Low-Power IoT Node Power Management |
Use Scenario: Deriving negative bias for ECG front-end amplifiers and op-amp level-shifting circuits in wearable biosensors. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supplying stable –1.2V reference for LT1004-based bandgap references. Use Value: 200 µA max no-load current extends coin-cell lifetime beyond 5 years in intermittent-sampling modes. |
Use Scenario: Generating dual supplies for mixed-signal SoCs and RF transceivers in NB-IoT modules powered by CR2032 cells. IC Role / Device Role / Timing Role: Configurable voltage converter supporting multiple topologies (inversion, doubling) via external capacitor selection. Use Value: BOOST pin enables frequency scaling to reduce output impedance during active transmit bursts - improving transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CPA+ | Higher 1.2 mA no-load current; requires external diode above 6.5V; no BOOST pin; only rated to 7V. | Legacy designs where cost is primary concern and 9V operation or ultra-low IQ is not required. | Select only if replacing existing ICL7660 layouts with no performance upgrades needed. |
| MAX1044CPA+ | Similar 1.5V–9V range and BOOST function, but 300 µA max no-load current; slightly lower voltage conversion efficiency (95% min). | Applications needing same topology flexibility but with less stringent IQ or efficiency requirements. | Prefer LTC1044CS8#TRPBF when >200 µA IQ or <97% efficiency would compromise system runtime or thermal budget. |
Compared with ICL7660CPA+, LTC1044CS8#TRPBF offers 6× lower quiescent current and guaranteed 9V operation without diodes; versus MAX1044CPA+, it delivers tighter voltage conversion efficiency (97% vs 95%) and lower output impedance - making it optimal for precision, battery-sensitive, and high-reliability analog subsystems.
Availability
LTC1044CS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation power, precision sensor signal conditioning, battery-powered medical sensors, and low-power IoT node power management requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LTC1044CS8#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1044CS8#TRPBF belongs to Analog Devices' Linear Technology switched-capacitor converter product line, designed specifically for low-noise, inductorless DC/DC conversion in space-constrained and EMI-sensitive applications.
FAQ
What is the maximum supply voltage supported by the LTC1044CS8#TRPBF?
The LTC1044CS8#TRPBF supports a maximum supply voltage of 9V across its full operating temperature range (–40°C to +85°C), with no external protection diode required - a key improvement over earlier 7660-family devices limited to 7V or requiring diodes above 6.5V. Absolute maximum rating is 9.5V, but sustained operation above 9V is not guaranteed.
Does the LTC1044CS8#TRPBF require external diodes for 9V operation?
No, the LTC1044CS8#TRPBF does not require external diodes for 9V operation. Its enhanced LTCMOS™ process and internal circuit design eliminate the need for protection diodes across the full 1.5V–9V supply range and –40°C to +85°C temperature range - unlike the ICL7660, which mandates an external diode above 6.5V.
How does the BOOST pin (Pin 1) affect the performance of the LTC1044CS8#TRPBF?
Tying the BOOST pin (Pin 1) of the LTC1044CS8#TRPBF to V+ increases the internal oscillator frequency by approximately seven times - e.g., from ~5 kHz to ~35 kHz at 5V. This reduces effective output impedance and output voltage ripple, improving load regulation and transient response for higher-current applications.
What is the typical output resistance of the LTC1044CS8#TRPBF and how is it affected by frequency?
The LTC1044CS8#TRPBF exhibits ~80 Ω output resistance at 5 kHz with 10 µF external capacitors. Output resistance follows a 1/f·C₁ relationship - decreasing with higher oscillator frequency or larger flying capacitor values. At 1 kHz, resistance rises to ~200 Ω, directly impacting load regulation (e.g., 0.8 V drop at 10 mA).
Can the LTC1044CS8#TRPBF generate precise voltage division such as VOUT = VIN/2?
Yes, the LTC1044CS8#TRPBF supports precise voltage division with VOUT = VIN/2 ±20 ppm accuracy - achieved using its internal charge-pump topology and matched internal switching. This capability is validated across temperature and supply voltage, making it suitable for ultra-stable reference splitting in ratiometric ADC systems and bridge sensor excitation.
LTC1044CS8#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC1044CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1044CS8#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 LTC1044CS8#TRPBF reliable?
The price and inventory of LTC1044CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1044CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1044CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1044CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1044CS8#TRPBF?
LTC1044CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1044CS8#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 LTC1044CS8#TRPBF?
For technical support, including LTC1044CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1044CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1044CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1044CS8#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 LTC1044CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1044CS8#TRPBF?
All LTC1044CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1044CS8#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 LTC1044CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1044CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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