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Analog Devices Inc. LTC1144CN8#PBF
- Part No.:
- LTC1144CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1144CN8#PBF.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:690
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Product details
Overview
LTC1144CN8#PBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter that inverts a positive input (2V–18V) to a complementary negative output (–2V to –18V). It integrates four power MOSFETs, an internal oscillator, divide-by-two logic, and voltage level shifter. Requires only two external capacitors and delivers up to 20mA load current with 56Ω typical output resistance - used in precision data acquisition systems requiring clean, low-noise dual-rail supplies.
For engineers reviewing the LTC1144CN8#PBF datasheet, LTC1144CN8#PBF pinout, LTC1144CN8#PBF application, or LTC1144CN8#PBF equivalent, key selection criteria include shutdown current (8µA), oscillator frequency control (10kHz base, 10× boost), open-circuit conversion efficiency (99.9%), output resistance vs. load, and compatibility with 8-lead PDIP layout for legacy industrial designs.
Technical Context
The LTC1144CN8#PBF implements a charge-pump topology using internal N-channel MOSFET switches controlled by a self-timed oscillator. Its divide-by-two logic ensures precise phase alignment between pump and reservoir capacitor switching cycles, minimizing shoot-through and substrate turn-on risk in the N-channel switch.
Oscillator frequency is user-adjustable via Pin 7 (OSC) capacitance or Pin 1 (BOOST) connection to V+, enabling operation from ~1kHz to >100kHz. Output impedance is governed by both MOSFET on-resistance and the 1/(f × C₁) equivalent resistance term - making frequency and capacitor selection critical for maintaining <120Ω output resistance at 20mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 18V - supports single-cell LiFePO₄ up to 16V wall adapters without external regulation |
| Output Voltage Range | –2V to –18V - true inversion with no external diodes; matches input magnitude within ±0.1% at no load |
| Supply Current (Active) | 1.1mA typical at 15V/10kHz - enables low-power portable instrumentation with minimal quiescent drain |
| Shutdown Current | 8µA maximum - allows battery-backed systems to maintain weeks of standby time |
| Output Resistance | 56Ω typical at 15V/20mA/10kHz - defines voltage droop under dynamic load; drops to ~20Ω at 100kHz |
| Oscillator Frequency | 10kHz (unloaded), adjustable to >100kHz with BOOST pin - higher f reduces ripple and improves transient response |
| Conversion Efficiency | 93% typical at 2kΩ load - balances switching loss and conduction loss across 2V–18V input range |
| Operating Temp Range | 0°C to 70°C - rated for commercial-grade embedded systems and test equipment environments |
Pinout & Package
Package: 8-Lead Plastic DIP (N8), 0.300-inch width, through-hole mounting compatible with legacy PCB layouts and manual soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (BOOST) | Oscillator frequency multiplier enable | Tie to V+ to raise fOSC ~10×; essential for reducing output impedance at high load currents |
| Pin 2 (CAP+) | Positive terminal of charge pump capacitor | Connects to C₁ anode; forms first stage of charge transfer path from V+ to VOUT |
| Pin 3 (GND) | Ground reference for all internal circuitry | Must be low-impedance node; shared return for CAP+, CAP–, SHDN, OSC, and VOUT |
| Pin 4 (CAP–) | Negative terminal of charge pump capacitor | Connects to C₁ cathode; completes charge transfer loop during switching phase |
| Pin 5 (VOUT) | Negative output terminal | Delivers inverted voltage; output impedance dominated by 1/(f × C₁) + MOSFET RDS(on) |
| Pin 6 (SHDN) | Active-low shutdown control | Pull to GND to disable oscillator and reduce IQ to 8µA; float or tie to V+ for normal operation |
| Pin 7 (OSC) | External oscillator control | Accepts external clock or external capacitor (0–100pF) to set fOSC; Schmitt-trigger input ensures noise immunity |
| Pin 8 (V+) | Positive supply input | Accepts 2V–18V DC; transient rating up to 20V; powers internal logic and MOSFET drivers |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power MOSFETs | Four on-chip N-channel switches eliminate external FETs and gate drivers - reduces BOM count and layout area |
| Adjustable oscillator frequency | 10kHz base frequency scalable to >100kHz via BOOST pin or external capacitor - enables optimization of efficiency vs. ripple trade-off |
| Low shutdown current | 8µA max shutdown current - supports energy-sensitive applications such as battery-powered data loggers |
| High open-circuit efficiency | 99.9% typical voltage conversion efficiency at no load - minimizes input-to-output voltage error in precision divider circuits |
| No external diodes required | Internal MOSFET architecture replaces discrete diodes - eliminates forward voltage drop and temperature drift errors |
| Wide input voltage range | Operates from 2V to 18V - accommodates single Li-ion, multi-cell alkaline, and industrial 12V/15V rails without pre-regulation |
Applications
| Data Acquisition Systems | Precision Instrumentation |
|---|---|
Use Scenario: Converting a +15V system rail into a stable –15V reference for dual-supply op-amps in 16-bit ADC front-ends. IC Role / Device Role / Timing Role: Inverting charge-pump voltage converter providing symmetrical analog supply rails with <56Ω output impedance. Use Value: Enables rail-to-rail input signal conditioning without external regulators or diodes - preserves SNR by minimizing supply-induced offset drift. | Use Scenario: Generating ultra-stable ±9V split supplies from an 18V battery in handheld multimeters. IC Role / Device Role / Timing Role: Battery splitter implementing precision voltage division with 0.002% accuracy at <100nA load. Use Value: Delivers matched positive/negative outputs referenced to common ground - eliminates need for matched external resistors or trimming. |
| Industrial Sensor Interfaces | Legacy Equipment Power Retrofit |
Use Scenario: Providing isolated –5V bias for piezoelectric sensor amplifiers in vibration monitoring modules. IC Role / Device Role / Timing Role: Regulated negative supply generator using external transistor feedback (Figure 12) to hold VOUT within ±10mV over 0–5mA load. Use Value: Achieves <20Ω effective output resistance at 9V input - maintains sensor bias stability despite cable capacitance and EMI coupling. | Use Scenario: Replacing obsolete ICL7660-based power sections in aging PLC I/O modules with improved efficiency and reliability. IC Role / Device Role / Timing Role: Drop-in compatible switched-capacitor inverter offering 93% power efficiency vs. 75% for ICL7660, with same 8-pin DIP footprint. Use Value: Reduces thermal stress on PCB and extends service life without board redesign - validated for 0°C–70°C commercial operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1054CN8#PBF | Higher 100mA output current, 2.5mA active supply current, wider 3.5V–15V input range | Supports heavier loads but lacks BOOST pin for frequency scaling; less suitable for ultra-low-noise precision dividers | Select when >20mA output or tighter input regulation is required; not recommended for <100nA ultra-precision divider use cases |
| MAX680CPA+ | Fixed 10kHz oscillator, 100mA output, 2.5mA supply current, no shutdown or frequency adjustment | Pin-compatible with LTC1144 but no SHDN or BOOST functionality - limits power management flexibility | Choose for cost-sensitive, fixed-frequency applications where shutdown and frequency tuning are unnecessary |
Compared with LTC1054CN8#PBF and MAX680CPA+, the LTC1144CN8#PBF uniquely combines 8µA shutdown, BOOST-enabled frequency scaling, and 99.9% open-circuit efficiency - making it optimal for low-power, high-accuracy, and layout-constrained designs where dynamic control of output impedance and ripple is critical.
Availability
LTC1144CN8#PBF is available at Aetrix Electronics and suitable for data acquisition systems, precision instrumentation, industrial sensor interfaces, and legacy equipment power retrofit requiring stable component supply and long-term obsolescence mitigation.
Supply support for LTC1144CN8#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 and maintains full technical and manufacturing continuity for legacy Linear products including the LTC series.
The LTC1144 belongs to Linear's precision switched-capacitor converter family, designed specifically for applications demanding accurate voltage inversion without external diodes or regulators - especially in space-constrained, low-power, and high-accuracy analog systems.
FAQ
What is the maximum continuous output current capability of the LTC1144CN8#PBF?
The LTC1144CN8#PBF delivers up to 20mA continuous output current at 15V input and 10kHz oscillator frequency while maintaining output voltage regulation within specification. At lower input voltages (e.g., 5V), the maximum load is reduced to ~3mA due to increased output resistance - confirmed by Electrical Characteristics table entries for ROUT and performance curves in TPC06 and TPC07.
Can the LTC1144CN8#PBF generate a regulated –5V output from a 9V input?
Yes, the LTC1144CN8#PBF can generate a regulated –5V output from a 9V input using the external transistor feedback configuration shown in Figure 12 of the datasheet. With this circuit, output resistance drops below 20Ω and load regulation holds within ±10mV from 0mA to 5mA - verified by Typical Application section and TPC09 efficiency/load curves.
Does the LTC1144CN8#PBF require external diodes for operation?
No, the LTC1144CN8#PBF does not require external diodes. Its internal architecture uses four integrated N-channel MOSFETs configured as synchronous switches, eliminating forward voltage drop and temperature-dependent leakage inherent in discrete diode-based charge pumps - explicitly stated in the Description and Applications sections.
How does the BOOST pin (Pin 1) affect oscillator frequency and output performance of the LTC1144CN8#PBF?
Tying the BOOST pin (Pin 1) of the LTC1144CN8#PBF to V+ increases oscillator frequency by approximately 10× - e.g., from 10kHz to ~100kHz. This reduces output impedance (e.g., from 56Ω to ~20Ω at 20mA) and lowers ripple voltage, improving transient response and load regulation - confirmed by TPC05, TPC11, and TPC12 performance graphs and Applications Information text.
Is the LTC1144CN8#PBF pin-compatible with the older ICL7660?
Yes, the LTC1144CN8#PBF is pin-compatible with the ICL7660 in the 8-lead DIP package and provides functional upgrade benefits: higher efficiency (93% vs. ~75%), lower shutdown current (8µA vs. ~10µA), BOOST-enabled frequency scaling, and no external diode requirement - documented in the "High Voltage Upgrade to LTC1044 or 7660" application note and Order Information table.
LTC1144CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1144CN8#PBF FAQ
1.How can I place an order for LTC1144CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1144CN8#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 LTC1144CN8#PBF reliable?
The price and inventory of LTC1144CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1144CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1144CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1144CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1144CN8#PBF?
LTC1144CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1144CN8#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 LTC1144CN8#PBF?
For technical support, including LTC1144CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1144CN8#PBF requirements.
6.How does Aetrix verify that LTC1144CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1144CN8#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 LTC1144CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1144CN8#PBF?
All LTC1144CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1144CN8#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 LTC1144CN8#PBF part is unused and in its original packaging.
Return procedure for LTC1144CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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