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Analog Devices Inc. LTC660CS8#PBF
- Part No.:
- LTC660CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC660CS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP INV 100MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:508
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Product details
Overview
LTC660CS8#PBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter optimized for inverting 1.5V–5.5V inputs to –1.5V––5.5V outputs or doubling 2.5V–5.5V inputs to 5V–11V outputs. It delivers 100mA output current with 6.5Ω typical output resistance and operates at 10kHz (or 80kHz with BOOST pin tied to V+), enabling compact, low-cost negative supply generation in data acquisition and battery-powered systems.
For engineers reviewing the LTC660CS8#PBF datasheet, LTC660CS8#PBF pinout, LTC660CS8#PBF application, or LTC660CS8#PBF equivalent, key selection criteria include its dual-mode operation (inverter/doubler), BOOST-pin frequency scaling, LV pin logic-level configuration, and compatibility with standard 150µF low-ESR external capacitors - all critical for stable ±5V rail generation and high-current upgrades from LTC1044/LTC7660.
Technical Context
The LTC660CS8#PBF integrates four power MOSFETs, an internal oscillator, divide-by-two logic, and a voltage level shifter to implement charge-pump-based DC-DC conversion without inductors. Its switching architecture supports both inverting and voltage-doubling topologies via pin-strapping of LV and selection of external capacitor values.
Oscillator frequency is user-controllable: 10kHz nominal with BOOST open, 80kHz when BOOST is tied to V+, or externally driven via OSC pin. Output impedance (6.5Ω typ at 100mA) is dominated by switch RDS(on) and external capacitor ESR - not reactive impedance - making it predictable across load and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100mA maximum into GND - sufficient for op-amp biasing, ADC reference supplies, and sensor signal conditioning stages. |
| Output Resistance | 6.5Ω typical at 100mA - determines voltage drop (0.65V at full load); minimized by low-ESR capacitors & BOOST-enabled higher frequency. |
| Oscillator Frequency | 10kHz (BOOST open) or 80kHz (BOOST = V+) - places switching outside audio band to reduce audible noise and improve ripple performance. |
| Conversion Efficiency | 88% at 100mA load (V+ = 5V) - balances quiescent current loss and switching loss; >96% at light loads due to low 0.08mA no-load IS. |
| Input Voltage Range | Inverter mode: 1.5V–5.5V; doubler mode: 2.5V–5.5V - supports single-cell Li-ion (3.0–4.2V), 3.3V logic rails, and legacy 5V systems. |
| Operating Temp | 0°C to 70°C - suitable for commercial-grade industrial and instrumentation applications without derating. |
| Supply Current | 0.08–0.5mA (BOOST open), 0.23–3mA (BOOST = V+) - enables ultra-low-power standby modes in portable equipment. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 0.150-inch width, RoHS-compliant, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BOOST | Oscillator frequency control input | Tie to V+ to raise fOSC from 10kHz to 80kHz; reduces output impedance and ripple under heavy load. |
| 2 - CAP+ | Positive terminal of charge-pump capacitor C1 | Connects to one side of flying capacitor; carries bidirectional 2×IOUT current during charge/discharge cycles. |
| 3 - GND | Power ground reference | Common return path for V+ and VOUT; must be low-impedance to minimize noise coupling into sensitive analog circuits. |
| 4 - CAP– | Negative terminal of charge-pump capacitor C1 | Completes charge-transfer loop with CAP+; polarity reversal enables inverting operation. |
| 5 - VOUT | Negative or doubled output voltage node | Delivers regulated-inverted (–VIN) or doubled (2×VIN) output; requires local 150µF reservoir capacitor (C2). |
| 6 - LV | Logic voltage reference for internal gate drivers | Tie to GND if V+ < 3V; float or tie to GND if V+ ≥ 3V; ensures proper MOSFET turn-on threshold across input range. |
| 7 - OSC | Internal oscillator node / external clock input | Accepts external square-wave clock (CMOS/TTL-compatible) or external timing capacitor to adjust fOSC. |
| 8 - V+ | Positive input supply rail | Accepts 1.5–5.5V (inverter) or 2.5–5.5V (doubler); absolute max 6V - must be decoupled locally to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode topology support | Single IC performs both inverting (±VIN) and doubling (2×VIN) functions - eliminates need for separate parts in multi-rail designs. |
| BOOST-pin frequency scaling | 4.5× increase in fOSC (10kHz → 80kHz) lowers effective output impedance and improves transient response without changing external components. |
| No-inductor design | Relies solely on two external 150µF capacitors - reduces BOM cost, board area, and EMI vs. inductive DC-DC converters. |
| Low quiescent current | 80µA typical no-load supply current - extends battery life in always-on monitoring and sensor nodes. |
| Robust short-circuit protection | Withstands 1-second output-to-GND short at ≤85°C - enables safe integration into fault-tolerant power subsystems. |
Applications
| Portable Data Acquisition | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld multimeter acquiring bipolar analog signals with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Generates clean –5V reference rail from 3.7V Li-ion cell using inverter mode; LV pin floated per spec. Use Value: Eliminates need for discrete charge pump IC + LDO combo, reducing solution size by 40% and component count by 3. |
Use Scenario: 4–20mA transmitter with isolated analog front-end requiring dual ±15V rails for op-amps and DACs. IC Role / Device Role / Timing Role: Provides –15V rail via stacked LTC660CS8#PBF configuration (Fig. 12); BOOST pins tied to V+ for lowest output impedance. Use Value: Achieves <100mV ripple at 50mA load without magnetics - avoids transformer saturation issues in space-constrained enclosures. |
| Medical Instrumentation Power | Legacy System Voltage Upgrade |
Use Scenario: Portable ECG monitor needing low-noise ±2.5V for precision instrumentation amplifiers. IC Role / Device Role / Timing Role: Operates in inverter mode with 150µF/0.1Ω ceramic caps; OSC pin left open for fixed 10kHz switching. Use Value: Delivers 99% no-load efficiency and <5mV p-p ripple - meets IEC 60601-1 EMC requirements without added filtering. |
Use Scenario: Retrofitting aging test equipment originally using LTC1044 (20mA) to support higher-resolution 24-bit ADCs drawing 80mA. IC Role / Device Role / Timing Role: Direct replacement in same SOIC-8 footprint; BOOST pin used to boost fOSC and maintain <1% regulation error. Use Value: Enables 4× output current upgrade without PCB redesign - leverages existing layout and capacitor footprints. |
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; no BOOST pin; fixed 10kHz oscillator. | Suitable only for low-current (<30mA) inverter applications; cannot replace LTC660CS8#PBF in 100mA designs without derating. | Select when cost sensitivity outweighs current demand and no frequency scaling is needed. |
| LTC7660CS8#PBF | 20mA max output; 35Ω output resistance; no BOOST or LV pins; 10kHz fixed oscillator; lower VIN min (1.5V) but narrower max (6V). | Targeted at ultra-low-power, low-cost consumer electronics - insufficient for industrial signal chains requiring >50mA. | Choose only for battery-backed RTCs or simple logic-level shifters where 20mA suffices. |
Compared with LTC1046CS8#PBF and LTC7660CS8#PBF, the LTC660CS8#PBF provides 2× and 5× higher output current respectively, plus BOOST-enabled dynamic impedance control - making it the sole option among the three capable of sustaining 100mA at <1V dropout across temperature.
Availability
LTC660CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, medical diagnostics equipment, and legacy system upgrades requiring stable component supply and long-term manufacturability.
Supply support for LTC660CS8#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 for precision measurement and power management.
The LTC660 belongs to Linear's legacy switched-capacitor converter family, designed specifically to replace bulky inductor-based solutions in space-constrained, low-noise analog systems requiring bipolar or boosted supplies.
FAQ
What is the maximum continuous output current of the LTC660CS8#PBF?
The LTC660CS8#PBF delivers up to 100mA continuous output current into GND when operating in inverter mode with V+ = 5V and BOOST = V+. This rating assumes ambient temperature ≤70°C, proper thermal layout (θJA = 150°C/W for SOIC), and use of low-ESR external capacitors. Exceeding 100mA risks thermal shutdown or reduced efficiency below 85%.
Can the LTC660CS8#PBF generate a positive doubled output voltage?
Yes - the LTC660CS8#PBF supports voltage doubling in the range of 2.5V–5.5V input to produce 5V–11V output. In this mode, LV must be tied to VOUT, and a start-up Schottky diode (e.g., 1N5817) is recommended for reliable initial charging. The LTC660CS8#PBF does not regulate the doubled output; regulation depends on load and capacitor selection.
How does the BOOST pin affect efficiency and output ripple of the LTC660CS8#PBF?
Tying the BOOST pin of the LTC660CS8#PBF to V+ raises oscillator frequency from 10kHz to 80kHz, reducing effective output impedance from 6.5Ω to ~1.5Ω and cutting output ripple by >60% at 100mA. However, quiescent current increases from 0.08mA to 0.23mA, slightly lowering light-load efficiency - a trade-off justified in high-current, low-ripple applications.
Is the LTC660CS8#PBF pin-compatible with the LTC1044 or LTC7660?
No - while the LTC660CS8#PBF shares the same 8-lead SOIC package outline, its pin functions differ significantly: BOOST (Pin 1), LV (Pin 6), and OSC (Pin 7) have no equivalents in LTC1044 or LTC7660. Direct replacement requires PCB layout revision. The LTC660CS8#PBF is a functional upgrade, not a drop-in substitute.
What external capacitors are required for stable operation of the LTC660CS8#PBF?
The LTC660CS8#PBF requires two 150µF low-ESR electrolytic or polymer capacitors: C1 (charge pump) between CAP+ (Pin 2) and CAP– (Pin 4), and C2 (reservoir) between VOUT (Pin 5) and GND (Pin 3). ESR must be <0.2Ω for C1 to avoid >4Ω effective impedance penalty; C2 ESR contributes directly to output ripple and should also be minimized.
LTC660CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC660CS8#PBF FAQ
1.How can I place an order for LTC660CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC660CS8#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 LTC660CS8#PBF reliable?
The price and inventory of LTC660CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC660CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC660CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC660CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC660CS8#PBF?
LTC660CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC660CS8#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 LTC660CS8#PBF?
For technical support, including LTC660CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC660CS8#PBF requirements.
6.How does Aetrix verify that LTC660CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC660CS8#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 LTC660CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC660CS8#PBF?
All LTC660CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC660CS8#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 LTC660CS8#PBF part is unused and in its original packaging.
Return procedure for LTC660CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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