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Analog Devices Inc./Maxim Integrated MAX660CSA+T
- Part No.:
- MAX660CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX660CSA+T.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,382
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Product details
Overview
MAX660CSA+T from Maxim Integrated is a CMOS monolithic charge-pump voltage converter IC that inverts +1.5V to +5.5V input to -1.5V to -5.5V output or doubles input to +3.0V to +11.0V, delivers 100mA output current, features selectable 10kHz/80kHz oscillator frequency via FC pin, and achieves >90% efficiency at mid-load with only two external capacitors - used in medical instruments and handheld instrument power supplies.
For engineers reviewing the MAX660CSA+T datasheet, MAX660CSA+T pinout, MAX660CSA+T application, or MAX660CSA+T equivalent, key selection criteria include guaranteed output resistance <15Ω with 10µF capacitors, low 120µA quiescent current, ±0.3V LV input tolerance, 6.5Ω typical output impedance, and SO-8 package compatibility with ICL7660 footprint.
Technical Context
The MAX660CSA+T implements a two-phase switched-capacitor topology with internal CMOS switches, supporting both inverting and voltage-doubling modes. Its oscillator frequency is programmable via FC pin (10kHz typ or 80kHz typ) or externally adjustable using capacitor or clock signal on OSC pin.
In inverter mode, LV must be tied to GND for VIN < 3V to bypass internal regulation; for VIN ≥ 3V, LV may be open or grounded. In doubler mode, LV is connected to OUT, and VIN is restricted to +2.5V to +5.5V. Output ripple is determined by load current, C2 value, ESR, and pump frequency (fPUMP = fOSC/2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +5.5V (supports single-cell Li battery and 3.3V/5V rails) |
| Output Current | 100mA continuous (enables rail generation for op-amps and analog front-ends) |
| Oscillator Frequency | 10kHz typ or 80kHz typ (selectable via FC pin; enables trade-off between capacitor size and quiescent current) |
| Conversion Efficiency | 88% typ at 100mA (reduces thermal load in space-constrained PCBs) |
| Output Impedance | 6.5Ω typ (ensures ≤0.65V drop at 100mA; critical for stable biasing) |
| Quiescent Current | 120µA typ (extends battery life in portable instrumentation) |
| Absolute Max V+ | +6V (provides 0.5V margin above 5.5V max operating input) |
Pinout & Package
MAX660CSA+T is housed in an 8-pin SO (Small Outline) package, 150-mil body width, with standard SO-8 footprint and gull-wing leads. Pin 1 is marked with a dot; device orientation follows JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts +1.5V to +5.5V; connects to input source and CAP+ during pumping phase |
| OSC | Oscillator control node | Internal 15pF node; accepts external capacitor or CMOS clock to set frequency; fPUMP = fOSC/2 |
| LV | Low-voltage operation select | Tie to GND for VIN < 3V; open or GND for VIN ≥ 3V; must be GND when OSC overdriven |
| OUT | Negative or doubled output | Delivers inverted (-VIN) or doubled (+2×VIN) voltage; rated for 120mA continuous |
| CAP- | Charge-pump capacitor negative terminal | Switches between GND and OUT; forms flying capacitor node with CAP+ |
| GND | Power ground reference | System ground return; shared with CAP- and CAP+ return paths in charge cycle |
| CAP+ | Charge-pump capacitor positive terminal | Switches between V+ and OUT; completes charge-transfer path with CAP- |
| FC | Frequency control input | Open → 10kHz osc; V+ → 80kHz osc; no effect when OSC driven externally |
Key Features
| Feature | Design Value |
|---|---|
| Invert or double supply voltage | Single IC supports dual topologies without external component change - simplifies BOM and layout reuse |
| Selectable 10kHz/80kHz oscillator | Enables optimization of capacitor size (smaller C at 80kHz) vs. quiescent current (lower IQ at 10kHz) |
| 6.5Ω typical output impedance | Ensures predictable voltage droop under load - eliminates need for post-regulation in many analog circuits |
| Pin-compatible upgrade to ICL7660 | Direct replacement in existing designs with higher output current and lower dropout |
| Guaranteed ROUT < 15Ω with 10µF caps | Validated performance with low-cost, widely available capacitors - reduces qualification effort |
Applications
| Medical Instrumentation | Hand-Held Test Equipment |
|---|---|
|
Use Scenario: Portable ECG monitor requiring dual ±5V rails from a single 3.6V Li-ion cell. IC Role / Device Role / Timing Role: MAX660CSA+T generates -5V rail via inversion while main system runs from +3.6V; operates in LV = GND mode for optimal low-VIN efficiency. Use Value: Eliminates need for magnetic components and reduces board area by >40% versus inductive DC/DC solution. |
Use Scenario: Battery-powered digital multimeter needing ±3.3V for ADC reference and op-amp biasing. IC Role / Device Role / Timing Role: MAX660CSA+T configured as inverter with FC = open (10kHz), minimizing IQ to extend 200-hour battery life. Use Value: Achieves 0.65V output drop at 50mA load - maintains ADC accuracy without LDO post-regulation. |
| Operational-Amplifier Power Supplies | Interface Power Supplies |
|
Use Scenario: Precision instrumentation amplifier stage requiring clean ±15V rails from +5V USB supply. IC Role / Device Role / Timing Role: Two cascaded MAX660CSA+T devices generate -15V (n=3 cascade); each operates with C1=C2=100µF, FC=V+. Use Value: Total output resistance ≈ 3 × 6.5Ω = 19.5Ω - sufficient for <1mA op-amp quiescent loads with <200mV droop. |
Use Scenario: RS-232 transceiver IC requiring ±12V from +5V logic rail in industrial PLC module. IC Role / Device Role / Timing Role: MAX660CSA+T configured in doubler mode (LV = OUT) to generate +10V, then inverted to -10V using second stage. Use Value: Delivers compliant RS-232 voltage levels with <50mV ripple at 10mA load - meets TIA-232-F spec without filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX860CSA+ | 50mA output current rating; 12Ω typical output impedance; supports same SO-8 package and FC/OSC/LV pinout. | Lower output current limits use in high-load op-amp or transceiver applications; better suited for ultra-low-power sensor nodes. | Select MAX860CSA+ when load current ≤50mA and lowest possible quiescent current (<200µA at 6kHz) is prioritized over drive strength. |
| ICL7660CPA+ | 30mA output current; 55Ω typical output impedance; identical pinout but not pin-compatible due to different LV behavior and oscillator architecture. | Not suitable for loads >30mA or where low dropout is required; requires redesign of capacitor values and may need LV tie-down. | Choose ICL7660CPA+ only for legacy cost-sensitive designs where MAX660CSA+T's performance advantages are unnecessary. |
Compared with MAX860CSA+ and ICL7660CPA+, the MAX660CSA+ provides 2× the output current of MAX860CSA+ and <1/8 the output impedance of ICL7660CPA+, enabling direct replacement in 100mA-capable systems without layout changes or capacitor re-optimization.
Availability
MAX660CSA+T is available at Aetrix Electronics and suitable for medical instrumentation, hand-held test equipment, operational-amplifier power supplies, and interface power supplies requiring stable component supply across commercial temperature range (0°C to +70°C).
Supply support for MAX660CSA+T 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
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX660 product line was designed specifically for compact, inductorless DC/DC conversion in battery-powered and space-constrained systems - targeting portable instrumentation, sensor interfaces, and analog signal conditioning.
FAQ
What is the maximum continuous output current specification for MAX660CSA+T?
The MAX660CSA+T is rated for 100mA continuous output current into resistive load with proper capacitor selection (C1 = C2 = 150µF, low-ESR). Absolute maximum output current is 120mA, but sustained operation above 100mA may exceed thermal limits in SO-8 package at elevated ambient temperatures. Derating is recommended per SO package dissipation curve (471mW at +70°C).
Can MAX660CSA+T be used to generate +10V from a +5V input?
Yes - the MAX660CSA+T supports voltage-doubling mode. When configured with LV tied to OUT and VIN = +5V, it delivers approximately +9.35V at 100mA. Input voltage must be ≥+2.5V for doubling mode; output voltage scales linearly with input, minus diode drops inherent in charge-pump architecture.
What is the purpose of the LV pin on MAX660CSA+T, and how should it be connected?
The LV pin on MAX660CSA+T selects low-voltage operation mode. For VIN < 3V, LV must be tied to GND to bypass internal regulation and maintain efficiency. For VIN ≥ 3V, LV may be left open or grounded - open connection simplifies drop-in replacement of ICL7660. LV must be grounded when OSC is overdriven by external clock.
Does MAX660CSA+T require external components to operate, and what are their functions?
Yes - MAX660CSA+T requires two external capacitors: C1 (flying capacitor between CAP+ and CAP-) and C2 (reservoir/output capacitor between OUT and GND). C1 transfers charge; C2 filters output ripple and supplies load current during half-cycle. Typical values are 1µF–150µF, with low ESR (<0.5Ω) recommended for best regulation and efficiency.
Is MAX660CSA+T pin-compatible with ICL7660, and what design considerations apply?
Yes - MAX660CSA+T is explicitly designed as a pin-compatible, higher-current upgrade to ICL7660 in SO-8 and DIP packages. Key considerations: LV pin behavior differs (ICL7660 has no LV pin), MAX660CSA+T offers FC pin for frequency selection, and output impedance is significantly lower (6.5Ω vs. 55Ω). No PCB changes are needed, but capacitor values may be reduced for equivalent performance.
MAX660CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- 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
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- 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-SOIC
MAX660CSA+T FAQ
1.How can I place an order for MAX660CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX660CSA+T 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 MAX660CSA+T reliable?
The price and inventory of MAX660CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX660CSA+T is usually 5 days.
3.What payment methods are accepted for MAX660CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX660CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX660CSA+T?
MAX660CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX660CSA+T 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 MAX660CSA+T?
For technical support, including MAX660CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX660CSA+T requirements.
6.How does Aetrix verify that MAX660CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX660CSA+T 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 MAX660CSA+T meets industry standards.
7.What is the process for return or replacement of MAX660CSA+T?
All MAX660CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX660CSA+T, 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 MAX660CSA+T part is unused and in its original packaging.
Return procedure for MAX660CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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