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Analog Devices Inc./Maxim Integrated MAX861ESA/V+
- Part No.:
- MAX861ESA/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX861ESA/V+.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,685
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Product details
Overview
MAX861ESA/V+ from Maxim Integrated is a frequency-selectable, 50mA switched-capacitor voltage converter that inverts +1.5V to +5.5V inputs or doubles +2.5V to +5.5V inputs. It operates at three 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 handheld test equipment.
For engineers reviewing the MAX861ESA/V+ datasheet, MAX861ESA/V+ pinout, MAX861ESA/V+ application, or MAX861ESA/V+ equivalent, key selection considerations include its -40°C to +85°C operating range, SO-8 package compatibility, inverter/doubler mode flexibility via LV pin, and trade-offs between capacitor size, quiescent current, and EMI sensitivity across FC configurations.
Technical Context
The MAX861ESA/V+ implements a BiCMOS charge-pump architecture with direct oscillator-to-switch coupling-no frequency division-enabling precise control of 13/100/250 kHz operation via FC pin states (VDD/GND/OUT). Its internal switch resistance (~8Ω) combines with external capacitor ESR to define total output resistance (ROUT = RO + 4×ESRC1 + ESRC2 + 1/(fS×C1)).
It supports two distinct operating modes: inverting (LV = GND) with 1.5V–5.5V input and doubling (LV = OUT) with 2.5V–5.5V input. Shutdown is active-low on pin 7 (–S-H-D-N–), reducing supply current to <1µA while preserving reverse-current path behavior dependent on configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA maximum continuous output-sufficient to replace inductive regulators in low-noise, space-constrained applications. |
| Switching Frequencies | 13kHz (FC = VDD), 100kHz (FC = GND), 250kHz (FC = OUT)-enables optimization of capacitor size vs. EMI vs. quiescent current. |
| Efficiency | 87% at 50mA load-achieved without inductors, supporting battery-powered systems with minimal thermal overhead. |
| Output Resistance | 12Ω typical (with 0.2Ω ESR capacitors)-defines voltage droop: e.g., -5.0V no-load → -4.4V at 50mA in inverter mode. |
| Shutdown Current | <1µA-enables ultra-low-power sleep states in portable instrumentation and sensor nodes. |
| Operating Temperature | -40°C to +85°C-validated for industrial and medical environments where extended thermal stability is required. |
| Supply Voltage Range | +1.5V to +5.5V (inverter), +2.5V to +5.5V (doubler)-supports single-cell Li-ion, alkaline, and regulated 3.3V/5V rails. |
Pinout & Package
MAX861ESA/V+ 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 outline S8-4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FC | Frequency Control input | Selects switching frequency: VDD = 13kHz, GND = 100kHz, OUT = 250kHz-directly impacts capacitor sizing and noise profile. |
| 2 C1+ | Flying capacitor positive terminal | Connects to positive plate of flying capacitor C1; forms charge-transfer path during pump cycle. |
| 3 GND | Ground reference | Primary return path for internal switches and external capacitors; must be low-impedance for stable regulation. |
| 4 C1- | Flying capacitor negative terminal | Connects to negative plate of flying capacitor C1; alternates polarity with C1+ to enable voltage inversion/doubling. |
| 5 OUT | Inverted or doubled output | Delivers -VIN (inverter) or +2VIN (doubler); output voltage varies linearly with load due to 12Ω ROUT. |
| 6 LV | Mode selection input | GND = inverter mode; OUT = doubler mode-configures internal switch matrix for target topology. |
| 7 –S-H-D-N– | Active-low shutdown | Pull low to disable all switching activity; draws <1µA-critical for power-gating in multi-rail systems. |
| 8 VDD | Positive supply input | Accepts +1.5V to +5.5V (inverter) or +2.5V to +5.5V (doubler); powers internal logic and charge pumps. |
Key Features
| Feature | Design Value |
|---|---|
| Three-frequency selection | Enables EMI avoidance by shifting fundamental noise away from sensitive bands (e.g., 100kHz avoids audio range). |
| Inductorless architecture | Eliminates magnetic components, reducing BOM cost, board area, and radiated emissions in compact PCB layouts. |
| Low-quiescent-current shutdown | Reduces system standby power to sub-microwatt levels-essential for battery life extension in portable diagnostics. |
| Configurable inverter/doubler mode | Single device supports dual rail generation (e.g., ±5V from +5V) without redesigning power stage or layout. |
| 12Ω output resistance | Provides predictable voltage droop under load-simplifies output filtering and enables accurate analog biasing. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
|
Use Scenario: Powering precision op-amps and ADC front-ends in battery-operated ECG or pulse oximeter modules. IC Role / Device Role / Timing Role: Generates clean negative rail (-3.3V) from single 3.3V supply using inverter mode with FC = GND (100kHz) to minimize capacitor size and ripple. Use Value: Eliminates need for bulky inductors while maintaining <10mV output droop at 20mA load-preserving signal integrity in low-noise analog chains. |
Use Scenario: Providing dual ±5V rails for LCD bias and analog signal conditioning in field-deployable multimeters. IC Role / Device Role / Timing Role: One MAX861ESA/V+ configured as inverter (LV = GND), another as doubler (LV = OUT), sharing VDD and ground. Use Value: Achieves full-rail analog performance with only four external capacitors-reducing component count by >40% versus discrete DC/DC solutions. |
| Interface Power Supplies | Operational-Amplifier Power Supplies |
|
Use Scenario: Generating isolated RS-232 driver voltage (±12V) from 5V USB power in embedded communication gateways. IC Role / Device Role / Timing Role: Cascaded MAX861ESA/V+ devices (Figure 1) produce -10V output; FC = OUT (250kHz) minimizes flying capacitor size. Use Value: Enables compliant RS-232 signaling without transformer-based isolation-cutting solution height by 60% and eliminating magnetic cross-talk. |
Use Scenario: Biasing rail-to-rail op-amps in portable audio preamplifiers requiring symmetric ±2.5V supplies. IC Role / Device Role / Timing Role: Dual MAX861ESA/V+ in inverter mode, one generating -2.5V from +2.5V, second regulating via feedback resistor divider. Use Value: Delivers matched positive/negative rails with <0.5% tracking error over temperature-critical for distortion-sensitive audio paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX860ESA/V+ | Same SO-8 package and pinout; offers 6/50/130 kHz frequencies instead of 13/100/250 kHz; 200µA typical quiescent current vs. 300µA for MAX861. | Better suited for ultra-low-power applications where lower-frequency operation reduces EMI and extends battery life at light loads. | Select MAX860ESA/V+ when prioritizing lowest possible quiescent current and moderate-frequency EMI control over peak output capability. |
| MAX660CPA+ | 100mA output, 5/40 kHz switching, 6.5Ω output resistance; requires OSC pin tie-off (not shutdown-compatible); larger 8-pin DIP/SO footprint. | Supports higher current loads but lacks frequency selectability and low-power shutdown-unsuitable for dynamic power management. | Choose MAX660CPA+ only when >50mA output is mandatory and fixed-frequency operation is acceptable in legacy designs. |
Compared with MAX860ESA/V+, the MAX861ESA/V+ provides higher-frequency options for tighter capacitor sizing and better noise floor control, while MAX660CPA+ trades configurability for raw current capacity-making MAX861ESA/V+ optimal for modern portable systems balancing size, efficiency, and EMI.
Availability
MAX861ESA/V+ 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 across industrial temperature ranges.
Supply support for MAX861ESA/V+ 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 semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and communications.
The MAX860/MAX861 product line was designed to replace inductive DC/DC converters in space- and noise-sensitive applications, delivering efficient, capacitor-based voltage inversion and doubling with programmable frequency control.
FAQ
What is the maximum continuous output current of the MAX861ESA/V+?
The MAX861ESA/V+ delivers up to 50mA continuous output current in both inverter and doubler configurations. This rating assumes proper capacitor selection (e.g., 4.7µF–68µF depending on FC setting) and thermal derating within the -40°C to +85°C operating range. Exceeding 50mA may cause excessive voltage droop or thermal stress, as confirmed in the Electrical Characteristics table under IOUT parameter.
How does the FC pin affect switching frequency and design trade-offs in the MAX861ESA/V+?
The FC pin on the MAX861ESA/V+ selects one of three fixed frequencies: 13kHz (FC = VDD), 100kHz (FC = GND), or 250kHz (FC = OUT). Higher frequencies reduce required capacitor values (e.g., 2.2µF at 250kHz vs. 68µF at 13kHz) but increase quiescent current. Lower frequencies improve efficiency at light loads but raise EMI risk near sensitive bands-designers must balance capacitor size, EMI, and power budget per Table 2 in the datasheet.
Can the MAX861ESA/V+ operate as both a voltage inverter and a voltage doubler?
Yes, the MAX861ESA/V+ supports both topologies via the LV pin: connect LV to GND for inverting mode (+1.5V to +5.5V input → -VIN output), or connect LV to OUT for doubling mode (+2.5V to +5.5V input → +2VIN output). Pin functionality and electrical specs for each mode-including supply range, efficiency, and output resistance-are explicitly differentiated in the Electrical Characteristics tables and Typical Operating Circuits section.
What is the shutdown behavior of the MAX861ESA/V+ and how does it impact system power management?
When the –S-H-D-N– pin (pin 7) is pulled low, the MAX861ESA/V+ enters shutdown mode, drawing less than 1µA supply current. In inverter mode, loads from OUT to GND are unpowered, though a reverse-current path exists from VDD to OUT. In doubler mode, loads from VDD to GND are unpowered, but VDD-to-OUT paths remain conductive. This behavior is documented in the Detailed Description section and enables precise power gating in multi-rail portable systems.
Is the MAX861ESA/V+ pin-compatible with the MAX660 or ICL7660 for drop-in replacement?
No, the MAX861ESA/V+ is not pin-compatible with the MAX660 or ICL7660. While both share 8-pin SO packaging, pin functions differ: MAX660/ICL7660 use pin 7 as OSC (oscillator output), whereas MAX861ESA/V+ uses pin 7 as active-low shutdown (–S-H-D-N–). Direct socket replacement requires rewiring pin 7 to VDD (to enable) and verifying FC pin connection compatibility-details are provided in the Compatibility section of the datasheet.
MAX861ESA/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX861ESA/V+ FAQ
1.How can I place an order for MAX861ESA/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX861ESA/V+ 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/V+ reliable?
The price and inventory of MAX861ESA/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX861ESA/V+ is usually 5 days.
3.What payment methods are accepted for MAX861ESA/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX861ESA/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX861ESA/V+?
MAX861ESA/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX861ESA/V+ 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/V+?
For technical support, including MAX861ESA/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX861ESA/V+ requirements.
6.How does Aetrix verify that MAX861ESA/V+ is sourced from the original manufacturer or authorized distributors?
All MAX861ESA/V+ 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/V+ meets industry standards.
7.What is the process for return or replacement of MAX861ESA/V+?
All MAX861ESA/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX861ESA/V+, 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/V+ part is unused and in its original packaging.
Return procedure for MAX861ESA/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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