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Analog Devices Inc. LTC1144IS8#TRPBF
- Part No.:
- LTC1144IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1144IS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP INV 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,889
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Product details
Overview
LTC1144IS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter that inverts a positive input (2V to 18V) to a complementary negative output (–2V to –18V). It integrates four power MOSFETs, a divide-by-two oscillator, and level-shifting logic. With only two external capacitors, it delivers up to 20mA load current at –15V from 15V input with 56Ω typical output resistance - ideal for precision data acquisition systems requiring low-noise bipolar supplies.
For engineers reviewing the LTC1144IS8#TRPBF datasheet, LTC1144IS8#TRPBF pinout, LTC1144IS8#TRPBF application, or LTC1144IS8#TRPBF equivalent, key selection criteria include its wide 2V–18V input range, shutdown current of 8µA, 10kHz default oscillator frequency, 93% typical power conversion efficiency, and SOIC-8 package compatibility with industrial temperature operation (–40°C to +85°C).
Technical Context
The LTC1144IS8#TRPBF implements a charge-pump topology using internal N-channel MOSFET switches controlled by a self-contained oscillator whose frequency is adjustable via Pin 7 (OSC) capacitance or Pin 1 (BOOST) connection to V+. Its divide-by-two logic ensures precise phase control between pump and reservoir capacitor switching cycles.
It features substrate isolation logic preventing parasitic N-channel body diode conduction, enabling reliable operation across its full 2V–18V input range without external diodes. Output regulation is unregulated but highly predictable: open-circuit voltage conversion efficiency reaches 99.9%, while loaded performance depends on fOSC, C1, and load current per the 1/(f × C1) equivalent resistance model.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 18V - supports single-cell LiFePO₄, dual-cell alkaline, and standard 5V/12V/15V rails without pre-regulation. |
| Output Voltage Range | –2V to –18V - complementary inversion with no polarity reversal circuitry required. |
| Oscillator Frequency | 10kHz (unloaded), scalable to ~100kHz with BOOST pin tied to V+ - higher frequency reduces output impedance and ripple under load. |
| Output Resistance | 56Ω typical at 15V/20mA/10kHz - defines load regulation error and minimum stable output voltage drop. |
| Shutdown Current | 8µA - enables ultra-low-power sleep mode in battery-backed instrumentation and portable sensors. |
| Power Conversion Efficiency | 93% typical at 15V/2kΩ load - balances switching loss and capacitive charge-transfer loss across operating conditions. |
| Operating Temperature | –40°C to +85°C - qualified for automotive cabin, industrial PLC, and outdoor embedded applications. |
Pinout & Package
Package: 8-Lead Plastic SOIC (S8), RoHS-compliant, moisture sensitivity level 1, JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency multiplier control | Tying to V+ raises fOSC ~10×, lowering effective output resistance and ripple for higher load currents. |
| 2 (CAP+) | Positive terminal of charge pump capacitor | Connects to C1 anode; forms first stage of charge transfer path from V+ to VOUT. |
| 3 (GND) | Ground reference node | Common return for all internal logic, oscillator, and switch substrates; must be low-impedance. |
| 4 (CAP–) | Negative terminal of charge pump capacitor | Connects to C1 cathode; alternately charged/discharged to generate inverted output. |
| 5 (VOUT) | Inverted output terminal | Delivers regulated-negative voltage; output impedance dominated by 1/(f × C₁) + MOSFET RDS(on). |
| 6 (SHDN) | Active-low shutdown enable | Pulling low disables oscillator and reduces supply current to 8µA; floating or high enables normal operation. |
| 7 (OSC) | External oscillator control | Accepts external clock or sets frequency via capacitor-to-GND; internal Schmitt trigger enables TTL/CMOS drive. |
| 8 (V+) | Positive supply input | Primary power source; absolute max 20V transient, 18V continuous; powers all internal circuitry and switches. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power MOSFETs and oscillator | Eliminates need for external switches, timing resistors, or clock sources - reduces BOM count and layout area. |
| Wide 2V–18V input range | Supports direct connection to unregulated battery stacks, wall adapters, and legacy industrial rails without LDO pre-regulation. |
| Shutdown mode with 8µA quiescent current | Enables energy-efficient duty-cycled operation in portable medical devices and remote sensor nodes. |
| Boost pin for 10× oscillator scaling | Allows dynamic reduction of output impedance from 120Ω to ~12Ω at 100kHz - improves load regulation at 20mA. |
| No external diodes required | Substrate isolation logic prevents latch-up and body diode conduction - simplifies design and improves reliability over LTC1044/7660. |
Applications
| Industrial Data Acquisition | Automotive Sensor Biasing |
|---|---|
Use Scenario: Generating ±15V analog front-end supplies for 16-bit ADCs and precision op-amps in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting voltage converter providing clean, low-impedance negative rail referenced to system ground. Use Value: Achieves <±1mV output drift over temperature using 10µF tantalum capacitors and 10kHz oscillator - avoids noise coupling from switching regulators. | Use Scenario: Supplying –5V bias to piezoelectric knock sensors and MEMS accelerometers in engine control units. IC Role / Device Role / Timing Role: Low-quiescent-current inverter enabling always-on sensor monitoring during vehicle sleep mode. Use Value: 8µA shutdown current extends battery standby life beyond ISO 16750-2 requirements while maintaining fast wake-up response. |
| Battery-Powered Instrumentation | Legacy System Voltage Upgrade |
Use Scenario: Creating split supplies for handheld oscilloscopes and portable spectrum analyzers powered by 2× Li-ion cells (7.2V–8.4V). IC Role / Device Role / Timing Role: Efficient charge-pump inverter delivering –7.2V to –8.4V with minimal heat rise in compact enclosures. Use Value: 93% power efficiency at 10mA load minimizes thermal stress on PCB; SOIC-8 footprint allows dense, double-sided assembly. | Use Scenario: Replacing obsolete ICL7660-based negative supplies in aging test equipment without board redesign. IC Role / Device Role / Timing Role: Pin-compatible upgrade offering wider input range, lower output resistance, and improved temperature stability. Use Value: Maintains identical SOIC-8 footprint and pinout while extending operational life from 0°C–70°C to –40°C–85°C and reducing output impedance by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1054CS8#PBF | Higher 100mA output current, but narrower 3.5V–15V input range and 2.5mA quiescent current. | Preferred for high-current analog circuits (e.g., op-amp drivers); unsuitable for sub-3.5V battery operation. | Select when >20mA load capability is required and input voltage stays above 3.5V. |
| LTC1046CS8#PBF | Optimized for low-voltage operation (1.5V–6V input), 3V max output magnitude, 200µA quiescent current. | Targeted at single-cell coin-cell or Li-ion systems needing only –3V; cannot support 12V/15V rails. | Choose for ultra-low-voltage portable devices where LTC1144IS8#TRPBF's 2V min is excessive. |
Compared with LTC1054CS8#PBF and LTC1046CS8#PBF, the LTC1144IS8#TRPBF uniquely balances wide-input flexibility (2V–18V), moderate output current (20mA), and ultra-low shutdown current (8µA), making it optimal for industrial and automotive systems requiring robustness across variable supply conditions.
Availability
LTC1144IS8#TRPBF is available at Aetrix Electronics and suitable for industrial data acquisition, automotive sensor biasing, battery-powered instrumentation, and legacy system voltage upgrade applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1144IS8#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 full product support, datasheet documentation, and long-term manufacturing commitment for legacy Linear parts.
The LTC1144 series belongs to Linear's precision switched-capacitor converter product line, designed specifically to replace discrete charge-pump designs and legacy ICs like the ICL7660 in applications demanding reliable, low-noise negative voltage generation without inductors.
FAQ
What is the maximum continuous input voltage rating for the LTC1144IS8#TRPBF?
The LTC1144IS8#TRPBF has a maximum continuous operating supply voltage (V+) of 18V. Transient voltages up to 20V are permitted for short durations, but sustained operation above 18V may cause permanent damage or accelerated parametric drift. This 18V rating enables direct use with 15V industrial rails and 12V automotive systems with margin.
Can the LTC1144IS8#TRPBF generate regulated output voltages?
The LTC1144IS8#TRPBF provides unregulated inverted output - its output voltage tracks –V+ with load-dependent droop defined by output resistance (56Ω typical). For regulated –5V, Figure 12 in the datasheet shows an external transistor-based shunt regulator using the LTC1144IS8#TRPBF as the raw negative supply source.
How does the BOOST pin affect the performance of the LTC1144IS8#TRPBF?
Tying the BOOST pin (Pin 1) of the LTC1144IS8#TRPBF to V+ increases the internal oscillator frequency by approximately 10× - from 10kHz to ~100kHz. This reduces the dominant 1/(f × C₁) output impedance term, lowering ROUT from 56Ω to ~12Ω at 20mA and decreasing output ripple, especially under dynamic loads.
Is the LTC1144IS8#TRPBF pin-compatible with the older LTC1044 or ICL7660?
Yes - the LTC1144IS8#TRPBF uses the same 8-pin SOIC (S8) footprint and identical pinout as the LTC1044 and ICL7660. It is a direct drop-in replacement offering wider input range (2V–18V vs. 1.5V–12V), lower output resistance (56Ω vs. 350Ω), and improved temperature stability without requiring PCB changes.
What external components are mandatory for basic operation of the LTC1144IS8#TRPBF?
Two noncritical electrolytic capacitors are mandatory: a 10µF pump capacitor (C1) between CAP+ (Pin 2) and CAP– (Pin 4), and a 10µF reservoir capacitor (C2) between CAP– (Pin 4) and GND (Pin 3). Aluminum or tantalum types are recommended; no matching or tight tolerance is required.
LTC1144IS8#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):
- 2V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 4kHz ~ 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1144IS8#TRPBF FAQ
1.How can I place an order for LTC1144IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1144IS8#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 LTC1144IS8#TRPBF reliable?
The price and inventory of LTC1144IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1144IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1144IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1144IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1144IS8#TRPBF?
LTC1144IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1144IS8#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 LTC1144IS8#TRPBF?
For technical support, including LTC1144IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1144IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1144IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1144IS8#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 LTC1144IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1144IS8#TRPBF?
All LTC1144IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1144IS8#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 LTC1144IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1144IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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