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Analog Devices Inc./Maxim Integrated MAX861ESA+T
- Part No.:
- MAX861ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX861ESA+T.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,185
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Product details
Overview
MAX861ESA+T from Maxim Integrated is a frequency-selectable, 50mA switched-capacitor voltage converter that inverts +2.5V to +5.5V inputs to negative outputs or doubles +2.5V to +5.5V inputs to positive outputs. It operates at three user-selectable switching frequencies (13/100/250 kHz), delivers ≥87% efficiency at 50mA load, and features 12Ω output resistance and 1µA shutdown current. It serves as a compact, inductorless power solution for portable medical instruments and interface power supplies.
For engineers reviewing the MAX861ESA+T datasheet, MAX861ESA+T pinout, MAX861ESA+T application, or MAX861ESA+T equivalent, key selection criteria include its -40°C to +85°C operating temperature range, SO-8 package compatibility, inverter/doubler dual-mode operation, and FC-pin programmable noise profile-critical when replacing legacy ICL7660 or MAX660 designs with tighter EMI constraints.
Technical Context
The MAX861ESA+T implements a BiCMOS charge-pump architecture with direct oscillator-to-switch coupling (no frequency division), enabling precise control of switching frequency via the FC pin. Its LV pin configures mode: grounded for inversion, connected to OUT for doubling-ensuring correct internal charge-transfer sequencing.
Unlike the MAX660/ICL7660, it eliminates external timing components and supports higher fundamental frequencies (up to 250 kHz), reducing required capacitor size while increasing quiescent current proportionally. Shutdown is active-low on the SHDN pin, disabling all internal circuitry and reducing supply current to <1 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA continuous - sufficient to replace inductive regulators in low-noise, space-constrained applications without inductors |
| Switching Frequencies | 13/100/250 kHz - selectable via FC pin to optimize capacitor size, EMI placement, and quiescent current trade-offs |
| Efficiency | ≥87% at 50mA - enables battery-powered operation with minimal thermal impact in portable instruments |
| Output Resistance | 12Ω - defines voltage droop: e.g., -5.0V no-load drops to -4.4V at 50mA load (ΔV = I × R) |
| Shutdown Current | <1µA - preserves battery life during system sleep modes in handheld devices |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and medical environments where ambient stability is critical |
| Supply Voltage Range | +2.5V to +5.5V (doubling), +1.5V to +5.5V (inverting) - supports single-cell Li-ion and multi-cell alkaline inputs |
Pinout & Package
MAX861ESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard 1.27mm pitch and 5.0mm × 6.2mm footprint per Maxim's outline S8-4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FC (Pin 1) | Frequency Control input | Selects one of three switching frequencies (13/100/250 kHz); floating or tied to VDD/GND/OUT determines operating point |
| C1+ (Pin 2) | Flying capacitor positive terminal | Connects to positive plate of flying capacitor C1; forms charge-transfer path during pump cycle |
| GND (Pin 3) | Ground reference | Common return for internal switches and external capacitors; must be low-impedance for stable ripple performance |
| C1− (Pin 4) | Flying capacitor negative terminal | Connects to negative plate of flying capacitor C1; alternates polarity with C1+ to enable voltage inversion/doubling |
| OUT (Pin 5) | Output terminal | Delivers inverted (–VIN) or doubled (+2VIN) output; voltage level depends on LV pin state and load current |
| LV (Pin 6) | Mode configuration input | Grounded → inverter mode; connected to OUT → doubler mode; determines internal switch matrix routing |
| SHDN (Pin 7) | Active-low shutdown control | Pulled high to enable; pulled low (<0.3V) disables all switching and reduces supply current to <1µA |
| VDD (Pin 8) | Positive input supply | Accepts +1.5V to +5.5V; powers internal oscillator, logic, and charge-pump switches |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode operation | Single device supports both voltage inversion and doubling via LV pin-reduces BOM count in multi-rail systems |
| Three-frequency selection | FC pin enables EMI-aware design: choose 13kHz for low-noise analog sections or 250kHz to shrink 10µF caps to 2.2µF |
| Low-quiescent-current shutdown | 1µA shutdown current extends battery runtime in intermittent-use medical sensors and portable test gear |
| No-inductor architecture | Eliminates magnetic components, PCB area, and EMI from inductors-ideal for compact, noise-sensitive layouts |
| Robust output drive | 12Ω output resistance ensures predictable droop under 50mA loads, simplifying rail budgeting in op-amp bias networks |
Applications
| Portable Medical Sensors | Industrial Interface Power |
|---|---|
Use Scenario: Powering analog front-end op-amps and ADCs in handheld ECG or pulse oximeter units with single 3.3V or 5V battery rails. IC Role / Device Role / Timing Role: Generates clean –3.3V or –5V bias rails from main supply using inverter mode; FC pin set to 100kHz to avoid interference with signal acquisition bandwidth. Use Value: Enables true bipolar op-amp operation without inductors, reducing board area by >30% versus buck-boost solutions and meeting Class II medical leakage requirements. | Use Scenario: Providing isolated ±5V rails for RS-232 or RS-485 transceivers in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Doubler mode generates +10V from +5V logic rail; LV pin tied to OUT; FC pin grounded for 100kHz operation balancing efficiency and capacitor cost. Use Value: Delivers stable 50mA output with <600mV drop at full load-sufficient to drive multiple transceivers while maintaining immunity to 2kV ESD transients. |
| Handheld Test Equipment | Operational Amplifier Bias Supplies |
Use Scenario: Generating dual ±4.5V rails for precision op-amps and DACs in battery-powered multimeters and signal generators. IC Role / Device Role / Timing Role: Two MAX861ESA+T devices cascaded: first in inverter mode (–VIN), second in doubler mode (–2VIN); FC pins set to 250kHz for minimal capacitor size. Use Value: Achieves –9V output with <15Ω total effective resistance-enabling rail-to-rail output swing in 16-bit DAC buffers without thermal derating. | Use Scenario: Supplying ±15V rails for high-voltage op-amps in analog signal conditioning stages of data acquisition systems. IC Role / Device Role / Timing Role: Inverter mode configured with LV = GND; FC = OUT for 250kHz operation; uses 4.7µF low-ESR tantalum caps per Table 3. Use Value: Provides 50mA per rail with ≤1% line regulation error across 3.3V–5.5V input range-meeting THD < –100dB requirements in audio-grade instrumentation. |
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 |
|---|---|---|---|
| MAX860ESA+ | Lower frequency set (6/50/130 kHz); 200µA typical quiescent current vs. MAX861ESA+T's 300µA | Better suited for ultra-low-noise analog sections where 6kHz fundamental is acceptable; less efficient at light loads | Select MAX860ESA+ when EMI sensitivity outweighs capacitor size constraints and load currents remain <20mA |
| MAX660CPA+ | Higher 100mA output; fixed 5/40kHz frequencies; requires external timing capacitor; 6.5Ω output resistance | Supports heavier loads but introduces inductor-like EMI at lower frequencies; larger solution size due to timing cap | Choose MAX660CPA+ only when >50mA output is mandatory and layout allows for 40kHz noise filtering |
Compared with MAX860ESA+, the MAX861ESA+T offers higher-frequency operation (up to 250 kHz) for smaller capacitors and better EMI containment, while MAX660CPA+ provides greater output current at the expense of fixed-frequency noise and larger external component count-making MAX861ESA+T optimal for compact, noise-critical, 50mA-class applications.
Availability
MAX861ESA+T is available at Aetrix Electronics and suitable for portable medical instruments, industrial interface power supplies, handheld test equipment, and operational-amplifier bias supplies requiring stable component supply across extended temperature ranges.
Supply support for MAX861ESA+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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX860/MAX861 product line delivers compact, inductorless DC-DC conversion for space- and noise-constrained systems-targeting replacement of legacy charge pumps like the ICL7660 in portable and battery-operated equipment.
FAQ
What is the maximum continuous output current of the MAX861ESA+T?
The MAX861ESA+T delivers 50mA continuous output current in both inverter and doubler configurations. This rating is guaranteed over the full –40°C to +85°C operating temperature range and applies when using recommended capacitor values (e.g., 4.7µF for 250kHz operation). Exceeding 50mA may cause excessive voltage droop or thermal stress; absolute maximum rated output is 60mA for short durations only.
How does the FC pin affect switching frequency in the MAX861ESA+T?
The FC pin on the MAX861ESA+T selects one of three nominal switching frequencies: 13kHz (FC = VDD or open), 100kHz (FC = GND), or 250kHz (FC = OUT). These frequencies are fixed per device variant and verified in the Electrical Characteristics table. Unlike the MAX660, no external timing components are needed-the FC pin directly controls the internal oscillator without division or buffering.
Can the MAX861ESA+T operate as both an inverter and a doubler?
Yes, the MAX861ESA+T supports both modes via the LV pin: connect LV to GND for inverting operation (e.g., +5V → –5V), or connect LV to OUT for doubling (e.g., +5V → +10V). The device's internal switch matrix reconfigures automatically. Mode selection is static-dynamic switching between modes during operation is not supported and may cause undefined behavior.
What is the shutdown current specification for the MAX861ESA+T?
The MAX861ESA+T draws less than 1µA supply current when the SHDN pin is driven low (<0.3V). This shutdown state disables all internal switching and logic, preserving battery life in standby. The device exits shutdown in ≤500µs after SHDN is pulled high. Note that reverse current paths exist between OUT and GND/VDD during shutdown, so external load connections must be evaluated per the Detailed Description section.
Is the MAX861ESA+T pin-compatible with the ICL7660 or MAX660?
No, the MAX861ESA+T is not pin-compatible with the ICL7660 or MAX660. While it shares the same 8-pin SO package footprint, pin functions differ: Pin 7 is SHDN (not OSC), and Pin 1 is FC (not NC or OSC). Direct socket replacement requires rewiring SHDN to VDD (to enable) and verifying FC connection per desired frequency-details are provided in the Compatibility section of the MAX861ESA+T datasheet.
MAX861ESA+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, 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 13kHz, 100kHz, 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX861ESA+T FAQ
1.How can I place an order for MAX861ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX861ESA+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 MAX861ESA+T reliable?
The price and inventory of MAX861ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX861ESA+T is usually 5 days.
3.What payment methods are accepted for MAX861ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX861ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX861ESA+T?
MAX861ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX861ESA+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 MAX861ESA+T?
For technical support, including MAX861ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX861ESA+T requirements.
6.How does Aetrix verify that MAX861ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX861ESA+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 MAX861ESA+T meets industry standards.
7.What is the process for return or replacement of MAX861ESA+T?
All MAX861ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX861ESA+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 MAX861ESA+T part is unused and in its original packaging.
Return procedure for MAX861ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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