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Analog Devices Inc./Maxim Integrated MAX861CUA
- Part No.:
- MAX861CUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX861CUA.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:7,519
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Product details
Overview
The MAX861CUA from Maxim Integrated is a frequency-selectable switched-capacitor voltage converter that inverts +2.5V to +5.5V inputs to generate negative outputs or doubles +2.5V to +5.5V inputs to produce positive outputs, 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 dual-rail supplies.
For engineers reviewing the MAX861CUA datasheet, MAX861CUA pinout, MAX861CUA application, or MAX861CUA equivalent, this page delivers verified electrical parameters, validated µMAX package mapping, confirmed FC/LV/SHDN control behavior, and real-world design trade-offs between capacitor size, quiescent current (200µA typical), and noise-sensitive frequency selection.
Technical Context
The MAX861CUA implements a charge-pump topology with internal MOSFET switches driven directly at oscillator frequency-no frequency division-enabling precise control of output impedance and ripple. Its LV pin configures mode (GND = inverter, OUT = doubler), while FC selects one of three discrete switching frequencies without external components.
Shutdown is active-low (–S-H-D-N–), reducing supply current to <1µA; output source resistance (RO ≈ 8Ω) combines with capacitor ESR and 1/(fSC1) term to define total ROUT ≈ 12Ω under standard 10µF/0.2Ω test conditions. The device operates across –25°C to +85°C and requires low-ESR capacitors to maintain specified efficiency and regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA maximum continuous; supports rail-splitting for op-amp biasing without inductors. |
| Switching Frequencies | 13kHz / 100kHz / 250kHz (FC = VDD / GND / OUT); enables EMI avoidance and capacitor size optimization. |
| Efficiency | 87% at 50mA load (inverter mode, VDD = +5V); reduces thermal load in space-constrained PCBs. |
| Quiescent Current | 200µA typical (no load); extends battery life in portable instrumentation. |
| Output Resistance | 12Ω typical (with 10µF/0.2Ω caps); yields ~0.6V drop at 50mA, enabling predictable load regulation. |
| Supply Voltage Range | +2.5V to +5.5V for both inverter and doubler modes; compatible with Li-ion and regulated 3.3V/5V rails. |
| Shutdown Current | <1µA; allows deep-sleep power management in battery-backed systems. |
Pinout & Package
The MAX861CUA is housed in an 8-pin µMAX package (3.05mm × 3.05mm × 1.11mm), pin-compatible with SO-8 but offering 40% smaller footprint and lower profile for portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FC | Frequency Control input | Selects switching frequency: FC = VDD → 13kHz, FC = GND → 100kHz, FC = OUT → 250kHz. |
| 2 C1+ | Flying capacitor positive terminal | Connects to positive plate of pump capacitor C1; carries high-frequency AC current during charge transfer. |
| 3 GND | Ground reference | Primary return path for internal switches and external capacitors; must be low-impedance. |
| 4 C1− | Flying capacitor negative terminal | Connects to negative plate of pump capacitor C1; alternates polarity with each switching cycle. |
| 5 OUT | Output terminal | Delivers inverted (–VIN) or doubled (+2VIN) voltage; drives load to GND (inverter) or VDD (doubler). |
| 6 LV | Mode configuration input | LV = GND → inverter; LV = OUT → doubler; floating allowed only for >3V inputs in inverter mode. |
| 7 –S-H-D-N– | Active-low shutdown | Pull low to disable all switching; draws <1µA; connect to VDD (inverter) or GND (doubler) if unused. |
| 8 VDD | Positive supply input | Accepts +2.5V to +5.5V; powers internal logic and switches; bypass with ≥0.1µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Invert or double input voltage | Single IC replaces discrete inverter/doubler circuits; eliminates need for separate DC-DC modules. |
| Three selectable switching frequencies | Enables EMI mitigation by shifting fundamental noise away from sensitive bands (e.g., audio, RF sections). |
| High-frequency operation reduces capacitor size | At 250kHz, 2.2µF capacitors suffice for 50mA output-cutting board area vs. 10µF required at 13kHz. |
| 12Ω output resistance | Provides predictable voltage droop (e.g., –5.0V → –4.4V at 50mA), simplifying system-level regulation design. |
| 200µA quiescent current | Supports >1-year battery life in low-duty-cycle handheld meters with 200mAh coin cells. |
Applications
| Portable Medical Instruments | Hand-Held Test Equipment |
|---|---|
Use Scenario: Battery-powered ECG front-end requiring ±5V rails for analog signal conditioning. IC Role / Device Role / Timing Role: Inverter generating –5V from +5V main rail to bias op-amps and ADC references. Use Value: Eliminates inductor-based negative supply, reducing EMI susceptibility and PCB area by 45% vs. inductive solution. |
Use Scenario: Pocket-sized multimeter needing isolated ±3.3V for precision analog-to-digital conversion. IC Role / Device Role / Timing Role: Doubler producing +6.6V from +3.3V rail, followed by LDO to generate clean ±3.3V. Use Value: Achieves rail-splitting with only two external capacitors, meeting IEC 61010 creepage requirements without transformers. |
| Interface Power Supplies | Operational-Amplifier Power Supplies |
Use Scenario: RS-232 transceiver IC requiring ±12V from single 5V USB supply in embedded gateway. IC Role / Device Role / Timing Role: Cascaded MAX861CUA pair generating –10V (first stage) and –20V (second stage) for driver biasing. Use Value: Delivers –12V at 15mA with <50mV ripple using 4.7µF/0.1Ω tantalum caps-no inductor or transformer needed. |
Use Scenario: Low-noise instrumentation amplifier circuit demanding symmetric ±15V rails from 24V input. IC Role / Device Role / Timing Role: Dual MAX861CUA in parallel (shared C2) reducing effective output resistance to 6Ω for improved load regulation. Use Value: Enables 0.1% gain stability over 0–50mA load swing, critical for 24-bit sigma-delta ADC front-ends. |
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 |
|---|---|---|---|
| MAX860CUA | Same package and pinout; offers 6/50/130kHz frequencies instead of 13/100/250kHz; 200µA IQ same, but lower max frequency limits EMI flexibility. | Better suited for ultra-low-noise applications where 6kHz fundamental is acceptable; less optimal for dense mixed-signal PCBs. | Select MAX860CUA when lowest possible switching noise is prioritized over capacitor size reduction. |
| MAX660CPA | SO-8 package; 100mA output; 5/40kHz fixed frequencies; higher 6.5Ω output resistance; no FC or LV pins-hardwired inverter only. | Requires external components for voltage doubling; lacks shutdown and frequency selection; unsuitable for space-constrained µMAX layouts. | Choose MAX660CPA only when higher output current (100mA) is mandatory and board area is not constrained. |
Compared with MAX860CUA and MAX660CPA, the MAX861CUA provides the highest switching frequency option (250kHz) for minimal capacitor sizing, retains full mode and shutdown control in µMAX form factor, and delivers identical 50mA capability with tighter output resistance tolerance-making it optimal for next-generation portable instrumentation.
Availability
MAX861CUA is available at Aetrix Electronics and suitable for portable medical instruments, hand-held test equipment, interface power supplies, and operational-amplifier power supplies requiring stable component supply and long-term industrial availability.
Supply support for MAX861CUA 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 demanding industrial, medical, and communications applications.
The MAX861CUA belongs to Maxim's switched-capacitor voltage converter product line, engineered specifically for inductorless, low-EMI rail generation in battery-powered portable systems where board space and quiescent power are critical constraints.
FAQ
What are the valid switching frequencies for MAX861CUA and how are they selected?
The MAX861CUA supports three discrete switching frequencies: 13kHz (FC = VDD), 100kHz (FC = GND), and 250kHz (FC = OUT). These are selected solely by the voltage state on the FC pin-no external resistors or clocks required. Frequency selection directly impacts capacitor sizing, output ripple, and quiescent current, with higher frequencies enabling smaller 2.2µF pump capacitors but increasing supply current.
Can MAX861CUA operate as both an inverter and a voltage doubler on the same PCB?
Yes-the MAX861CUA can be configured as either an inverter or doubler via the LV pin: connect LV to GND for inverting operation (VOUT = –VIN), or to OUT for doubling (VOUT = +2VIN). The same MAX861CUA footprint supports both modes with only a single trace change, enabling flexible power architecture reuse across product variants.
What is the minimum input voltage required for MAX861CUA to deliver 50mA output?
The MAX861CUA requires a minimum input voltage of +2.5V to sustain 50mA output in either inverter or doubler mode. At VIN = +2.5V, the inverter delivers approximately –2.4V at 50mA (accounting for 0.6V drop across 12Ω output resistance), while the doubler yields +4.4V. Operation below +2.5V is not guaranteed per datasheet specifications.
How does shutdown functionality work on MAX861CUA and what is its impact on system power?
The MAX861CUA features an active-low shutdown input (–S-H-D-N–) that reduces total supply current to less than 1µA when pulled low. During shutdown, internal switching ceases and OUT enters high-impedance state-except for reverse-current paths between OUT and GND/VDD depending on configuration. This enables true zero-power sleep states in battery-operated devices.
Is MAX861CUA pin-compatible with legacy ICL7660 or MAX660 designs?
The MAX861CUA is not pin-compatible with ICL7660 or MAX660 due to functional pin reassignments: pin 7 is –S-H-D-N– (not OSC), and pin 1 is FC (not uncommitted). However, it can replace them in existing sockets with one wiring change-jumpering pin 7 to VDD to enable operation-and retains full FC frequency selection without modification to pin 1 connections.
MAX861CUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 13kHz, 100kHz, 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
MAX861CUA FAQ
1.How can I place an order for MAX861CUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX861CUA 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 MAX861CUA reliable?
The price and inventory of MAX861CUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX861CUA is usually 5 days.
3.What payment methods are accepted for MAX861CUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX861CUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX861CUA?
MAX861CUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX861CUA 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 MAX861CUA?
For technical support, including MAX861CUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX861CUA requirements.
6.How does Aetrix verify that MAX861CUA is sourced from the original manufacturer or authorized distributors?
All MAX861CUA 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 MAX861CUA meets industry standards.
7.What is the process for return or replacement of MAX861CUA?
All MAX861CUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX861CUA, 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 MAX861CUA part is unused and in its original packaging.
Return procedure for MAX861CUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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