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Analog Devices Inc. LTC660CN8#PBF
- Part No.:
- LTC660CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC660CN8#PBF.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,230
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Product details
Overview
LTC660CN8#PBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter configured as an inverting charge pump. It converts 1.5V–5.5V positive input to complementary –1.5V to –5.5V output with 100mA continuous load capability, 6.5Ω typical output resistance, and 88% efficiency at 100mA. It enables low-cost, high-current negative supply generation in data acquisition systems and battery-powered instrumentation.
For engineers reviewing the LTC660CN8#PBF datasheet, LTC660CN8#PBF pinout, LTC660CN8#PBF application, or LTC660CN8#PBF equivalent, key selection criteria include verified inverting/doubling mode operation, BOOST-pin-enabled 80kHz oscillator frequency, guaranteed 100mA output drive, and N8 PDIP package compatibility with legacy through-hole layouts.
Technical Context
The LTC660CN8#PBF integrates four power MOSFETs, a divide-by-two logic stage, voltage level shifter, and internal oscillator-enabling both inverting (VIN → –VIN) and doubling (VIN → 2×VIN) modes without external diodes in inverter configuration. Its LV pin selects logic reference (GND or VOUT) based on input voltage threshold (≥3V), while BOOST pin raises oscillator frequency from 10kHz to 80kHz when tied to V+.
Oscillator frequency is externally adjustable via capacitor on OSC pin or overdrivable by external clock; output impedance is dominated by 1/(f·C₁) term below 1kHz but transitions to MOSFET on-resistance dominance above 10kHz. Output voltage regulation relies on fixed switching topology-not feedback control-making it unregulated but highly predictable under defined load and capacitor conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100mA maximum continuous-supports rail-splitting and op-amp biasing for precision analog front-ends. |
| Output Resistance | 6.5Ω typical at 100mA-determines voltage drop (0.65V loss at full load) and limits minimum load regulation. |
| Oscillator Frequency | 10kHz (BOOST open) or 80kHz (BOOST = V+)-higher frequency reduces output impedance and ripple for high-current loads. |
| Input Voltage Range | 1.5V–5.5V for inverting mode; 2.5V–5.5V for doubling mode-defines usable supply rails in portable and industrial systems. |
| Power Efficiency | 88% at 100mA load (V+ = 5V)-directly impacts thermal design and battery life in energy-constrained applications. |
| Operating Temperature | 0°C to 70°C-suitable for commercial-grade embedded systems, not extended industrial or automotive environments. |
| Absolute Max Supply | 6V-exceeding this risks permanent damage; requires input filtering or LDO pre-regulation if sourced from noisy 5V rails. |
Pinout & Package
Package: 8-lead plastic DIP (N8), 0.300" wide, through-hole mount, JEDEC MS-001 compliant. RoHS-compliant lead finish, Pb-free, with 300°C max soldering temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency control | Tie to V+ to raise fOSC from 10kHz to 80kHz; improves transient response and reduces output impedance under heavy load. |
| 2 (CAP+) | Charge pump capacitor positive terminal | Connects to C1 anode; carries bidirectional switching current-requires low-ESR capacitor (≤0.2Ω) to minimize voltage loss. |
| 3 (GND) | Power ground reference | Common return path for V+ and VOUT; must be low-impedance node to prevent ground bounce in high-frequency switching. |
| 4 (CAP–) | Charge pump capacitor negative terminal | Connects to C1 cathode; completes charge transfer loop-critical for stable inversion ratio and ripple suppression. |
| 5 (VOUT) | Negative output voltage terminal | Delivers regulated-inverted output (–VIN); output impedance of 6.5Ω defines load-dependent voltage sag. |
| 6 (LV) | Logic voltage reference selector | Tie to GND for VIN < 3V; float or tie to GND for VIN ≥ 3V; determines internal logic rail and startup behavior. |
| 7 (OSC) | Internal oscillator control/external clock input | Accepts external clock or capacitor for frequency tuning; sink/source current ≤ ±5µA-compatible with CMOS logic drivers. |
| 8 (V+) | Positive input supply | Primary power input (1.5–5.5V); also supplies internal logic and gate drive-must be well-bypassed near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting & doubling modes | Single IC supports dual topologies: true inverter (1.5–5.5V → –1.5 to –5.5V) and doubler (2.5–5.5V → 5–11V), reducing BOM count in multi-rail designs. |
| BOOST-pin frequency scaling | Enables 8× oscillator speed increase (10kHz → 80kHz), cutting effective output resistance by ~8× and lowering ripple for 100mA loads. |
| No external diodes required (inverter mode) | Eliminates forward-voltage drop and thermal derating of discrete diodes-improves efficiency and simplifies layout in negative rail generation. |
| Two-capacitor operation | Only C1 (charge pump) and C2 (reservoir) needed-reduces component count, PCB area, and cost versus inductor-based DC/DC solutions. |
| 100mA output with 6.5Ω ROUT | Delivers 2× the current of LTC1044/LTC7660 while maintaining comparable output impedance-enables direct upgrade paths in legacy designs. |
Applications
| Instrumentation Signal Conditioning | Data Acquisition Front-End |
|---|---|
Use Scenario: Generating symmetric ±5V rails from a single 5V supply for dual-supply op-amps and ADC drivers in portable test equipment. IC Role / Device Role / Timing Role: Inverting charge pump providing stable –5V output; operates at 10kHz or 80kHz depending on BOOST configuration to balance efficiency vs. ripple. Use Value: Eliminates need for isolated DC/DC or transformer-based negative supplies-reducing size, cost, and EMI in compact handheld instruments. | Use Scenario: Powering SAR ADC reference buffers and PGA stages requiring clean, low-noise negative bias in medical sensor interfaces. IC Role / Device Role / Timing Role: Unregulated negative voltage source with predictable 6.5Ω output impedance-enables precise load-line compensation in analog signal chains. Use Value: Maintains 88% efficiency at 100mA load, minimizing self-heating that could drift precision resistor networks or reference voltages. |
| Battery-Powered Rail Splitting | Legacy System Upgrade Path |
Use Scenario: Deriving ±4.5V from a 9V battery in field-deployable environmental monitors using ultra-low-quiescent op-amps. IC Role / Device Role / Timing Role: Battery splitter operating in inverting mode; LV pin tied to GND ensures reliable startup at low battery voltages (down to 1.5V). Use Value: Supports full 0°C–70°C operating range without external components-extending usable battery life versus thermally limited switching regulators. | Use Scenario: Replacing obsolete LTC1044-based negative supplies in industrial PLC I/O modules requiring higher current capability. IC Role / Device Role / Timing Role: Pin-compatible functional upgrade delivering 5× more output current (100mA vs. 20mA) with identical N8 DIP footprint and external capacitor values. Use Value: Enables direct PCB replacement without layout changes-reducing qualification time and sustaining engineering cost for long-lifecycle products. |
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 |
|---|---|---|---|
| LTC1046CS8#PBF | 50mA max output current; 12Ω typical output resistance; same N8/S8 packaging and pinout. | Lower current capability limits use in high-drive analog circuits; suitable only where load < 50mA. | Select when lower cost and reduced thermal load outweigh need for 100mA drive. |
| LTC7660CS8#PBF | 20mA max output; 35Ω output resistance; no BOOST pin-fixed 10kHz oscillator only. | Insufficient for >20mA loads; higher ROUT causes excessive voltage sag in precision applications. | Choose only for ultra-low-power, low-current legacy replacements where board space is constrained. |
Compared with LTC1046CS8#PBF and LTC7660CS8#PBF, the LTC660CN8#PBF delivers 2× and 5× higher output current respectively, with BOOST-enabled frequency scaling that directly lowers output impedance-making it the only option capable of sustaining 100mA loads with sub-1V dropout in compact DIP form factor.
Availability
LTC660CN8#PBF is available at Aetrix Electronics and suitable for instrumentation signal conditioning, data acquisition front-end power, battery-powered rail splitting, and legacy system upgrade paths requiring stable component supply and long-term obsolescence management.
Supply support for LTC660CN8#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC660 belongs to Linear's legacy switched-capacitor voltage converter product line, designed specifically for low-noise, low-EMI, high-current unregulated negative and doubled supply generation in space- and cost-constrained analog systems.
FAQ
What is the maximum continuous output current specification for the LTC660CN8#PBF?
The LTC660CN8#PBF is rated for 100mA continuous output current into a resistive load when operating in inverting mode with V+ = 5V, C1 = C2 = 150µF, and BOOST = V+. This value is confirmed in the Electrical Characteristics table under IOUT parameter and validated across temperature (0°C to 70°C). Exceeding 100mA may cause thermal shutdown or voltage collapse due to 6.5Ω output resistance limiting regulation.
Can the LTC660CN8#PBF operate from a 3.3V input supply, and what configuration is required?
Yes, the LTC660CN8#PBF supports 3.3V input in inverting mode (1.5V–5.5V range). The LV pin must be tied to GND for reliable startup and logic-level stability, as the internal switch connecting LV to GND activates only at V+ ≥ 3V-leaving LV floating at exactly 3.3V risks marginal operation. With LV = GND, the device delivers –3.3V output with 6.5Ω ROUT and 88% efficiency at 100mA load.
Does the LTC660CN8#PBF require external diodes in inverting mode, and why is this significant?
No, the LTC660CN8#PBF does not require external diodes in standard inverting mode-its integrated four-MOSFET bridge handles bidirectional charge transfer. This eliminates diode forward-voltage drop (typically 0.3–0.7V), reduces heat generation, and avoids reverse-recovery noise. The significance is improved efficiency (88% vs. ~75% with discrete diodes) and cleaner output for sensitive analog circuits like precision ADC references.
How does the BOOST pin affect oscillator frequency and output performance of the LTC660CN8#PBF?
Tying the BOOST pin to V+ raises the internal oscillator frequency from 10kHz to 80kHz, which reduces effective output impedance by approximately 8× (from 6.5Ω to ~0.8Ω) and cuts output voltage ripple proportionally. This is critical for maintaining regulation under dynamic 100mA loads and enables stable operation with smaller external capacitors-verified in TPC03 and TPC12 performance curves.
Is the LTC660CN8#PBF pin-compatible with the LTC1044 or LTC7660, and what are the key upgrade benefits?
Yes, the LTC660CN8#PBF uses the same 8-lead PDIP (N8) package and identical pinout as LTC1044 and LTC7660, enabling drop-in replacement. Key upgrade benefits include 5× higher output current (100mA vs. 20mA), 3.5× lower output resistance (6.5Ω vs. 22–35Ω), BOOST-enabled frequency scaling, and elimination of external diodes-delivering measurable improvements in load regulation, thermal performance, and PCB simplicity.
LTC660CN8#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):
- 1.5V, 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 10kHz, 80kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC660CN8#PBF FAQ
1.How can I place an order for LTC660CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC660CN8#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 LTC660CN8#PBF reliable?
The price and inventory of LTC660CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC660CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC660CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC660CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC660CN8#PBF?
LTC660CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC660CN8#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 LTC660CN8#PBF?
For technical support, including LTC660CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC660CN8#PBF requirements.
6.How does Aetrix verify that LTC660CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC660CN8#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 LTC660CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC660CN8#PBF?
All LTC660CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC660CN8#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 LTC660CN8#PBF part is unused and in its original packaging.
Return procedure for LTC660CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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