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Analog Devices Inc. LTC660CS8#TRPBF
- Part No.:
- LTC660CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC660CS8#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP INV 100MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,224
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Product details
Overview
LTC660CS8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter configured as an inverting or doubling charge pump. It delivers ±5V from 5V input, supports 100mA output current, exhibits 6.5Ω typical output resistance, and operates with internal oscillator frequencies of 10kHz (BOOST open) or 80kHz (BOOST tied to V+). It enables low-cost, high-current negative supply generation in data acquisition systems.
For engineers reviewing the LTC660CS8#TRPBF datasheet, LTC660CS8#TRPBF pinout, LTC660CS8#TRPBF application, or LTC660CS8#TRPBF equivalent, key selection criteria include verified inverting/doubling mode operation, load-dependent efficiency (88% at 100mA), BOOST-pin frequency control, dual-capacitor simplicity, and SOIC-8 package compatibility with legacy LTC1044/LTC7660 upgrades.
Technical Context
The LTC660CS8#TRPBF integrates four power MOSFETs, a divide-by-two stage, voltage level shifter, and internal oscillator-enabling both inverting (1.5V–5.5V input → –1.5V to –5.5V) and doubling (2.5V–5.5V input → 5V–11V) modes. Pin 6 (LV) selects logic reference: tied to GND for V+ < 3V, floating or grounded for V+ ≥ 3V, and connected to VOUT in doubler mode.
Oscillator frequency is user-adjustable via BOOST pin (10kHz typ. open, 80kHz typ. tied to V+) or external capacitor on OSC pin (Pin 7), with external clock drive capability. Output impedance is dominated by 1/fC1 term at low frequencies and switch RON at high frequencies-validated by measured 6.5Ω at 10kHz with 150µF capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100mA maximum into GND-supports rail-splitting and analog front-end biasing without external boost stages. |
| Output Resistance | 6.5Ω typical at 100mA load-determines voltage drop (0.65V loss at full load) and regulates output stiffness. |
| Oscillator Frequency | 10kHz (BOOST open) or 80kHz (BOOST = V+)-higher frequency reduces ripple and effective output impedance. |
| Supply Voltage Range | 1.5V–5.5V for inverter mode; 2.5V–5.5V for doubler mode-enables single-cell Li-ion or multi-cell alkaline operation. |
| Power Efficiency | 88% at 100mA load (V+ = 5V); 99% no-load-directly impacts thermal design and battery life in portable systems. |
| Package | SOIC-8 (S8)-industry-standard footprint compatible with automated assembly and thermal relief pads. |
| Operating Temperature | 0°C to 70°C-validated for commercial-grade embedded instrumentation and industrial control interfaces. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 150 mil width, JEDEC MS-012AC compliant. Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency control input | Tie to V+ to raise internal oscillator from 10kHz to 80kHz-reduces output impedance and ripple under heavy load. |
| 2 (CAP+) | Positive terminal of charge pump capacitor C1 | Connects to C1 anode during charge phase; carries ~2× output current-requires low-ESR capacitor (≤0.2Ω). |
| 3 (GND) | Power supply ground reference | Common return path for all internal logic and switch drivers; must be low-impedance for stable regulation. |
| 4 (CAP–) | Negative terminal of charge pump capacitor C1 | Connects to C1 cathode during discharge phase; forms flying capacitor node with CAP+ for voltage inversion. |
| 5 (VOUT) | Negative or doubled output voltage terminal | Delivers –V+ (inverter) or +2V+ (doubler); output impedance includes switch RON and capacitor ESR contributions. |
| 6 (LV) | Logic voltage reference selector | Tie to GND for V+ < 3V; float or tie to GND for V+ ≥ 3V; connect to VOUT only in doubler configuration. |
| 7 (OSC) | Internal oscillator control/external clock input | Accepts external clock (CMOS/TTL with pull-up) or capacitor for frequency tuning-enables synchronization and noise shaping. |
| 8 (V+) | Positive input supply voltage | Primary power source (1.5V–5.5V); supplies internal logic, gate drivers, and charge pump energy-must be well-bypassed. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting & doubling modes | Single IC supports both –VIN and +2VIN outputs-eliminates need for separate inverters or doublers in mixed-rail systems. |
| 100mA continuous output | 4× higher current than LTC1044-enables direct powering of op-amps, ADC references, and sensor bias networks. |
| BOOST-pin frequency scaling | 8× oscillator frequency increase (10kHz → 80kHz) lowers effective output impedance by ~8×-critical for <1% load regulation. |
| Two external capacitor requirement | Only C1 (flying) and C2 (reservoir) needed-reduces BOM count, PCB area, and cost versus inductor-based DC/DC solutions. |
| Wide input voltage range | Operates from 1.5V (single-cell alkaline) to 5.5V (USB-powered)-supports battery-backed and wall-adapter designs without LDO pre-regulation. |
Applications
| Portable Data Acquisition | Rail-Splitting for Op-Amp Bias |
|---|---|
|
Use Scenario: Battery-powered handheld meter acquiring bipolar analog signals with 16-bit SAR ADC. IC Role / Device Role / Timing Role: LTC660CS8#TRPBF generates –5V rail from 5V USB or Li-ion source to bias ADC reference and op-amp inputs. Use Value: Delivers 100mA at 88% efficiency with 6.5Ω output impedance-ensures <0.1% gain error across full load range without external regulators. |
Use Scenario: Industrial sensor signal conditioning module requiring ±5V rails from single 5V supply. IC Role / Device Role / Timing Role: LTC660CS8#TRPBF acts as inverting charge pump to create symmetric negative rail referenced to system GND. Use Value: Enables true bipolar operation of rail-to-rail op-amps with no diode drops or transformer coupling-reducing size and EMI. |
| Battery-Powered Instrumentation | Legacy Upgrade Path |
|
Use Scenario: Field-deployed environmental monitor powered by two AA cells (3V nominal). IC Role / Device Role / Timing Role: LTC660CS8#TRPBF operates in inverter mode (V+ = 3V, LV = GND) to generate –3V for precision analog front-end. Use Value: Maintains regulation down to 1.5V input-extends usable battery life beyond cutoff of linear regulators or older charge pumps. |
Use Scenario: Retrofit of aging test equipment originally using LTC1044-based negative supplies. IC Role / Device Role / Timing Role: LTC660CS8#TRPBF replaces LTC1044 in same SOIC-8 footprint with identical pinout and capacitor values. Use Value: Provides 5× higher output current (100mA vs. 20mA) and 10× lower output resistance-enabling faster settling and reduced noise floor. |
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 |
|---|---|---|---|
| LTC1044CS8#TRPBF | 20mA max output current; 35Ω typical output resistance; no BOOST pin; fixed 10kHz oscillator. | Lower current capability limits use to micropower sensors or low-drive references-not suitable for 100mA loads. | Select when ultra-low quiescent current (25µA) and minimal BOM are prioritized over output drive. |
| LTC7660CS8#TRPBF | 50mA max output current; 15Ω output resistance; no BOOST pin; requires external diodes in doubler mode. | Lacks integrated MOSFETs-needs external Schottky diodes for voltage doubling, increasing component count and losses. | Choose for cost-sensitive designs where 50mA output suffices and diode overhead is acceptable. |
Compared with LTC1044CS8#TRPBF and LTC7660CS8#TRPBF, the LTC660CS8#TRPBF provides significantly higher output current and lower output resistance without external diodes-making it the optimal choice for modern data acquisition and rail-splitting applications demanding >50mA load capability.
Availability
LTC660CS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and battery-powered analog signal chains requiring stable component supply, long-term lifecycle support, and SOIC-8 footprint compatibility.
Supply support for LTC660CS8#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 archives, and application engineering for legacy Linear parts including the LTC660 family.
The LTC660 series was designed as a high-current, low-ESR switched-capacitor voltage converter targeting cost-sensitive, space-constrained applications needing clean bipolar or doubled supplies without inductors.
FAQ
What are the absolute maximum ratings for LTC660CS8#TRPBF?
The LTC660CS8#TRPBF has an absolute maximum supply voltage of 6V, output short-circuit duration to GND of 1 second, and operating temperature range of 0°C to 70°C. Exceeding 6V on V+ or applying voltages outside –0.3V to (V+ + 0.3V) on BOOST, OSC, or LV pins may cause latch-up. The device's maximum power dissipation is 500mW, with junction temperature limited to 100°C.
Can LTC660CS8#TRPBF operate from a 1.5V input in inverter mode?
Yes, the LTC660CS8#TRPBF supports inverter mode operation from 1.5V to 5.5V input. At 1.5V input, LV must be tied to GND per datasheet guidance. Output voltage will be approximately –1.5V, with efficiency and output resistance degraded relative to higher input voltages-verified by TPC04 and TPC05 curves showing increased ROUT below 2.5V.
How does BOOST pin connection affect LTC660CS8#TRPBF performance?
Tying BOOST to V+ raises the internal oscillator frequency from 10kHz to 80kHz, reducing effective output impedance and output voltage ripple-particularly beneficial at 100mA load. This change improves load regulation and allows smaller external capacitors while maintaining stability, as confirmed by TPC03 and TPC12 efficiency vs. frequency plots.
Is LTC660CS8#TRPBF pin-compatible with LTC1044CS8#TRPBF?
Yes, the LTC660CS8#TRPBF uses identical SOIC-8 pinout and marking layout as LTC1044CS8#TRPBF, enabling drop-in replacement in existing designs. However, the BOOST pin (Pin 1) is unused in LTC1044 and must be left open or tied to V+ in LTC660CS8#TRPBF to achieve full performance-no PCB changes required for basic functionality.
What capacitor types and values are recommended for LTC660CS8#TRPBF?
Low-ESR electrolytic or tantalum capacitors of 150µF are recommended for both C1 (flying) and C2 (reservoir), as validated in all typical application circuits. C1 ESR directly multiplies output impedance by ~4×, so ESR ≤ 0.2Ω is critical. Ceramic capacitors are not recommended due to insufficient capacitance and microphonic effects at switching frequencies.
LTC660CS8#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, 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC660CS8#TRPBF FAQ
1.How can I place an order for LTC660CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC660CS8#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 LTC660CS8#TRPBF reliable?
The price and inventory of LTC660CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC660CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC660CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC660CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC660CS8#TRPBF?
LTC660CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC660CS8#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 LTC660CS8#TRPBF?
For technical support, including LTC660CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC660CS8#TRPBF requirements.
6.How does Aetrix verify that LTC660CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC660CS8#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 LTC660CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC660CS8#TRPBF?
All LTC660CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC660CS8#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 LTC660CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC660CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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