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Analog Devices Inc./Maxim Integrated MAX861ISA-TG069
- Part No.:
- MAX861ISA-TG069
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX861ISA-TG069.pdf
- Description:
- IC REG CHARGE PUMP 50MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,278
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Product details
Overview
MAX861ISA-TG069 from Maxim Integrated is a frequency-selectable switched-capacitor voltage inverter/doubler IC that converts +1.5V to +5.5V inputs to inverted outputs (–VIN) or +2.5V to +5.5V inputs to doubled positive outputs (+2VIN), delivering up to 50mA with 12Ω output resistance, 87% efficiency at full load, and selectable switching frequencies of 13/100/250kHz. It serves as a compact, inductorless power solution for portable medical instruments and handheld test equipment requiring stable negative rail generation.
For engineers reviewing the MAX861ISA-TG069 datasheet, MAX861ISA-TG069 pinout, MAX861ISA-TG069 application, or MAX861ISA-TG069 equivalent, key selection criteria include its three-frequency FC control, 1µA shutdown current, ±1.5V to ±5.5V input/output voltage compatibility, SO-8 package footprint, and direct replacement suitability for legacy ICL7660-based designs with minimal board changes.
Technical Context
The MAX861ISA-TG069 implements a BiCMOS charge-pump architecture with internal flying-capacitor switches driven directly at oscillator frequency-no frequency division. Its LV pin selects inverter (LV = GND) or doubler (LV = OUT) mode, while FC pin configures one of three discrete switching frequencies (13kHz, 100kHz, or 250kHz), each with distinct trade-offs in capacitor size, quiescent current, and noise spectrum.
Unlike the MAX660/ICL7660, it features an active-low shutdown (SHDN) pin reducing supply current to <1µA, and its output source resistance (RO ≈ 8Ω) combines with external capacitor ESR to determine total ROUT = RO + 4×ESRC1 + ESRC2 + 1/(fS×C1). The device operates across –25°C to +85°C and is rated for continuous 60mA peak output current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA max continuous - supports moderate-power op-amp biasing and sensor interface rails without inductors |
| Switching Frequencies | 13kHz / 100kHz / 250kHz - enables optimization of capacitor size (e.g., 47µF at 13kHz vs. 2.2µF at 250kHz) and EMI avoidance |
| Efficiency | 87% at 50mA load - minimizes thermal rise and extends battery life in portable systems |
| Quiescent Current | 200µA typical - ensures low standby power in always-on instrumentation subsystems |
| Shutdown Current | <1µA - enables deep-sleep modes in battery-powered medical devices |
| Output Resistance | 12Ω typical (with 0.2Ω ESR caps) - defines voltage droop: e.g., –4.4V output at 50mA from +5V input |
| Input Voltage Range | +1.5V to +5.5V (inverter); +2.5V to +5.5V (doubler) - compatible with single-cell Li-ion, alkaline, and regulated 3.3V/5V rails |
Pinout & Package
MAX861ISA-TG069 is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm, 1.75mm height, RoHS-compliant, with standard JEDEC MS-012AC outline and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FC | Frequency Control input | Selects switching frequency: FC = VDD → 13kHz; FC = GND → 100kHz; FC = OUT → 250kHz |
| C1+ | Flying capacitor positive terminal | Connects to positive plate of C1; forms charge-transfer path during pump cycle |
| GND | Ground reference | System ground return for all internal circuitry and external capacitors |
| C1− | Flying capacitor negative terminal | Connects to negative plate of C1; alternates polarity with C1+ to invert/double voltage |
| OUT | Inverted or doubled output | Delivers –VIN (inverter) or +2VIN (doubler); drives load with 12Ω effective source impedance |
| LV | Mode select input | LV = GND → inverter; LV = OUT → doubler; floating allowed only above 3V in inverter mode |
| SHDN | Active-low shutdown control | Drives low to disable pump operation and reduce supply current to <1µA |
| VDD | Positive input supply | Accepts +1.5V to +5.5V; powers internal oscillator, logic, and switch drivers |
Key Features
| Feature | Design Value |
|---|---|
| Three-frequency selection via FC pin | Enables EMI-sensitive designs to avoid critical bands (e.g., 100kHz avoids audio band; 250kHz reduces cap size by 5× vs. 13kHz) |
| 1µA shutdown supply current | Supports ultra-low-power sleep states in portable diagnostics equipment without auxiliary regulators |
| 12Ω output resistance (typ.) | Ensures predictable voltage droop (e.g., 600mV at 50mA), simplifying rail budgeting in precision analog front-ends |
| BiCMOS process technology | Delivers low on-resistance switches and stable performance across –25°C to +85°C industrial temperature range |
| SO-8 package compatibility | Direct drop-in replacement for MAX660/ICL7660 sockets with only SHDN pin wiring change (jumper to VDD) |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Powering dual-supply op-amps and ADC drivers in battery-operated ECG or pulse oximeter modules. IC Role / Device Role / Timing Role: Generates clean –3.3V rail from 3.3V main supply using inverter configuration (LV = GND), enabling rail-to-rail analog signal conditioning. Use Value: Eliminates bulky inductors and reduces PCB area by >40% versus inductive DC/DC, while maintaining 87% efficiency at 20mA load. | Use Scenario: Providing ±5V rails for analog front-end circuitry in portable multimeters and signal generators. IC Role / Device Role / Timing Role: Configured as voltage doubler (LV = OUT) to generate +10V from 5V USB input, then paired with second MAX861ISA-TG069 in inverter mode for –10V. Use Value: Achieves dual-rail operation with only four external capacitors per rail, avoiding transformer-based or inductor-based solutions. |
| Interface Power Supplies | Operational-Amplifier Power Supplies |
Use Scenario: Supplying isolated RS-232 transceiver bias rails in industrial IoT gateways with limited board space. IC Role / Device Role / Timing Role: Inverter mode generates –5.5V from 3.3V system rail to meet RS-232 driver voltage requirements (±5V to ±15V). Use Value: Meets TIA-232-F spec with <100mV ripple (using 10µF/0.2Ω ESR caps at 100kHz), eliminating need for LDO post-regulation. | Use Scenario: Biasing high-speed, low-noise op-amps in portable oscilloscope front-ends requiring ±12V rails. IC Role / Device Role / Timing Role: Cascaded MAX861ISA-TG069 devices (Figure 1) generate –12V from 3.3V input, leveraging 13kHz FC setting for lowest noise. Use Value: Delivers –12V at 15mA with <20mV p-p ripple, meeting THD specs for 100MHz amplifiers without added filtering. |
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 |
|---|---|---|---|
| MAX860ISA | Same SO-8 package, identical pinout, but offers 6/50/130kHz FC options and 200µA quiescent current (vs. 300µA for MAX861ISA-TG069) | Better suited for low-noise, low-frequency applications where 6kHz minimizes EMI; less optimal for compact cap sizing | Select MAX860ISA when prioritizing lowest possible switching noise over capacitor miniaturization |
| ICL7660CPA | Legacy 8-pin SO device with fixed 10kHz switching, 10mA max output, 55Ω output resistance, no FC or SHDN pins | Limited to low-current, non-critical applications; requires larger capacitors and lacks shutdown control | Choose ICL7660CPA only for cost-sensitive, low-power legacy replacements where 50mA capability is unnecessary |
Compared with MAX860ISA, MAX861ISA-TG069 provides higher-frequency options (up to 250kHz) for smaller capacitors and better noise immunity, while ICL7660CPA lacks frequency control and shutdown-making MAX861ISA-TG069 the preferred choice for modern, space-constrained, battery-sensitive designs requiring 50mA output and flexible power sequencing.
Availability
MAX861ISA-TG069 is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, interface power supplies, and operational-amplifier power supplies requiring stable component supply and long-term industrial temperature support (–25°C to +85°C).
Supply support for MAX861ISA-TG069 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 is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and communication applications.
The MAX860/MAX861 product line was designed specifically to replace legacy charge pumps like the ICL7660 with higher efficiency, lower quiescent current, and frequency flexibility-targeting portable, battery-powered instrumentation and interface power systems.
FAQ
What is the maximum continuous output current specification for MAX861ISA-TG069?
The MAX861ISA-TG069 is rated for 50mA continuous output current under typical conditions (VDD = +5V, TA = +25°C, C1 = C2 = 10µF). Absolute maximum rating allows 60mA, but sustained operation above 50mA may increase output droop and thermal stress. Derating is recommended above +70°C ambient per the SO package's 5.88mW/°C power dissipation limit.
How does the FC pin configure switching frequency on MAX861ISA-TG069?
The FC pin on MAX861ISA-TG069 selects one of three discrete switching frequencies: FC = VDD or open → 13kHz; FC = GND → 100kHz; FC = OUT → 250kHz. These values are device-specific to MAX861 (vs. MAX860's 6/50/130kHz) and directly set the charge-pump oscillator frequency without division-enabling precise EMI management and capacitor sizing.
Can MAX861ISA-TG069 be used as a direct replacement for ICL7660 in existing SO-8 layouts?
Yes, MAX861ISA-TG069 is pin-compatible with ICL7660 in SO-8 packages, but requires one wiring change: the ICL7660's OSC pin (pin 1) maps to FC on MAX861ISA-TG069, and its NC pin (pin 7) maps to SHDN. To enable operation, SHDN must be tied to VDD (not left floating), making it a near-drop-in upgrade with improved frequency control and shutdown capability.
What is the output resistance of MAX861ISA-TG069 and how does it affect voltage regulation?
MAX861ISA-TG069 has a typical output resistance of 12Ω (including 0.2Ω capacitor ESR contributions). This resistance causes predictable voltage droop: e.g., at 50mA load, output drops 600mV from ideal –VIN. Unlike regulated converters, MAX861ISA-TG069 provides unregulated but highly repeatable output impedance-ideal for applications where load current is stable and rail budgeting can accommodate linear droop.
Does MAX861ISA-TG069 support both inverting and doubling configurations, and how is mode selected?
Yes, MAX861ISA-TG069 supports both modes: connect LV to GND for inverting (–VIN output) or to OUT for doubling (+2VIN output). This dual-mode capability is confirmed in the Pin Description and Typical Operating Circuits sections of the datasheet. Mode selection is static-no dynamic switching-and LV must not float in doubler mode; in inverter mode, floating LV is acceptable only if VDD > 3V.
MAX861ISA-TG069 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 13kHz, 100kHz, 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX861ISA-TG069 FAQ
1.How can I place an order for MAX861ISA-TG069 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX861ISA-TG069 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 MAX861ISA-TG069 reliable?
The price and inventory of MAX861ISA-TG069 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX861ISA-TG069 is usually 5 days.
3.What payment methods are accepted for MAX861ISA-TG069?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX861ISA-TG069 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX861ISA-TG069?
MAX861ISA-TG069 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX861ISA-TG069 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 MAX861ISA-TG069?
For technical support, including MAX861ISA-TG069 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX861ISA-TG069 requirements.
6.How does Aetrix verify that MAX861ISA-TG069 is sourced from the original manufacturer or authorized distributors?
All MAX861ISA-TG069 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 MAX861ISA-TG069 meets industry standards.
7.What is the process for return or replacement of MAX861ISA-TG069?
All MAX861ISA-TG069 units undergo pre-shipment inspection (PSI). If there is an issue with MAX861ISA-TG069, 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 MAX861ISA-TG069 part is unused and in its original packaging.
Return procedure for MAX861ISA-TG069:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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