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Analog Devices Inc./Maxim Integrated MAX861CSA+T
- Part No.:
- MAX861CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX861CSA+T.pdf
- Description:
- IC REG CHARG PUMP INV 50MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,806
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Product details
Overview
MAX861CSA+T from Maxim Integrated is a frequency-selectable, 50mA switched-capacitor voltage inverter/doubler IC operating from +1.5V to +5.5V (inverter) or +2.5V to +5.5V (doubler), delivering up to –5.5V output or +11V output with 12Ω typical output resistance, 87% efficiency at 50mA, and three user-selectable switching frequencies (13/100/250 kHz). It serves as a compact, inductorless power supply for op-amp biasing and portable instrument rails.
For engineers reviewing the MAX861CSA+T datasheet, MAX861CSA+T pinout, MAX861CSA+T application, or MAX861CSA+T equivalent, key selection criteria include its dual-mode operation (inverter/doubler), active-low shutdown (<1µA), FC-pin frequency selection, low-quiescent-current performance (200µA typ), and compatibility with legacy ICL7660/MAX660 footprints when configured correctly.
Technical Context
The MAX861CSA+T implements a BiCMOS charge-pump architecture with direct oscillator-to-switch drive (no frequency division), enabling precise control of switching frequency via the FC pin-set to VDD (13kHz), GND (100kHz), or OUT (250kHz). Its LV pin configures mode: grounded for inverting operation, connected to OUT for doubling.
Output regulation is unregulated but load-stable due to 12Ω effective source resistance (including internal switch RO ≈ 8Ω and capacitor ESR contributions), yielding predictable droop (e.g., –5.0V → –4.4V at 50mA with +5V input). Shutdown disables all active circuitry, reducing supply current to <1µA while preserving reverse-current paths depending on load topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 50mA max - supports rail generation for multiple op-amps or low-power analog circuitry without inductors. |
| Switching Frequencies | 13/100/250 kHz - selectable via FC pin; higher frequencies reduce external capacitor size (e.g., 2.2µF at 250kHz vs. 68µF at 13kHz). |
| Input Voltage Range | +1.5V to +5.5V (inverter), +2.5V to +5.5V (doubler) - enables use with single-cell Li-ion, alkaline, or regulated 3.3V/5V supplies. |
| Efficiency | 87% at 50mA load - minimizes thermal impact and extends battery life in portable medical or handheld instruments. |
| Shutdown Current | <1µA - critical for ultra-low-power sleep modes in battery-operated devices requiring long shelf life. |
| Output Resistance | 12Ω typical - determines output voltage droop under load; enables predictable rail design without feedback compensation. |
| Quiescent Current | 200µA typical - ensures minimal standby drain when active but unloaded, suitable for always-on sensor interfaces. |
Pinout & Package
MAX861CSA+T is housed in an 8-pin SO package (SOIC-8, 150mil width), pin-compatible with industry-standard voltage converters including MAX660 and ICL7660 when LV and SHDN are appropriately wired.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 8) | Positive input supply | Accepts +1.5V to +5.5V; powers internal oscillator and switches; must supply startup surge current up to 90mA above load demand. |
| SHDN (Pin 7) | Active-low shutdown control | Pull low to disable device; draw <1µA; in inverter mode, connect to VDD if unused; in doubler mode, connect to GND if unused. |
| OUT (Pin 5) | Negative output (inverter) or doubled positive output (doubler) | Delivers inverted (–VIN) or doubled (+2VIN) voltage; output impedance dominates rail stability; requires external C2 reservoir capacitor. |
| LV (Pin 6) | Mode configuration input | Connect to GND for inverting operation; connect to OUT for doubling; floating allowed only with VIN > 3V for MAX660 compatibility. |
| FC (Pin 1) | Frequency control select | Sets switching frequency: VDD = 13kHz, GND = 100kHz, OUT = 250kHz - directly impacts capacitor sizing, ripple, and quiescent current. |
| C1+ (Pin 2) / C1– (Pin 4) | Flying capacitor terminals | Form charge-transfer path; require low-ESR capacitors (e.g., 2.2–68µF); C1 value inversely affects output resistance per ROUT = RO + 4×ESRC1 + ESRC2 + 1/(fS×C1). |
| GND (Pin 3) | Reference ground | System return node; connects to PCB ground plane; critical for noise control and accurate output voltage referencing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode operation (inverter/doubler) | Single IC replaces two discrete solutions; mode selected by LV pin connection - reduces BOM count and board area. |
| Three-frequency selection via FC pin | Enables optimization of capacitor size (2.2µF at 250kHz) vs. efficiency (higher fS increases supply current) vs. EMI avoidance (select fS outside sensitive bands). |
| 12Ω typical output resistance | Provides predictable load droop (e.g., 600mV drop at 50mA); eliminates need for post-regulation in moderate-precision analog rails. |
| 200µA typical quiescent current | Supports always-on functionality in low-duty-cycle systems like portable data loggers without compromising battery runtime. |
| Sub-1µA shutdown current | Meets stringent energy budget requirements for IoT edge nodes and implantable medical devices during deep-sleep states. |
Applications
| Operational-Amplifier Power Supplies | Portable Medical Instruments |
|---|---|
|
Use Scenario: Generating ±5V rails for precision instrumentation amplifiers in handheld ECG or glucose meters. IC Role / Device Role / Timing Role: Inverting +5V supply to –5V; LV = GND, FC = GND for 100kHz operation balancing capacitor size and efficiency. Use Value: Eliminates bulky inductors and simplifies layout while maintaining 87% efficiency at 30mA load - critical for compact, battery-powered diagnostics. |
Use Scenario: Providing isolated negative bias for photodiode transimpedance amplifiers in portable pulse oximeters. IC Role / Device Role / Timing Role: Low-noise inverter mode with FC = OUT (250kHz) to minimize capacitor footprint and ripple in space-constrained modules. Use Value: Achieves 12Ω output resistance and <10mVpp ripple with 2.2µF ceramics - preserves signal integrity in high-gain analog front-ends. |
| Interface Power Supplies | Hand-Held Instruments |
|
Use Scenario: Generating –3.3V rail for RS-232 level-shifting ICs in industrial handheld scanners. IC Role / Device Role / Timing Role: Inverter configured with LV = GND, FC = VDD (13kHz) to maximize efficiency and minimize quiescent current in intermittent-use devices. Use Value: Delivers 50mA at 88% efficiency with 200µA no-load draw - extends battery life between scans without sacrificing interface reliability. |
Use Scenario: Doubling 3.3V logic supply to +6.6V for LCD bias in ruggedized field multimeters. IC Role / Device Role / Timing Role: Positive voltage doubler mode (LV = OUT), FC = GND (100kHz) for optimal capacitor cost/performance trade-off. Use Value: Produces stable +6.6V output with 600mV droop at full load - meets display contrast requirements across temperature without regulation overhead. |
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 |
|---|---|---|---|
| MAX660ESA+ | 100mA output, fixed 5/40kHz switching, 6.5Ω output resistance, no FC/LV pins - simpler control but less flexible frequency/noise tuning. | Higher current capability suits multi-rail systems; lower output resistance improves regulation; lacks mode selection - limited to inverter-only use. | Select MAX660ESA+ when >50mA load or tighter voltage regulation is required and board space allows larger 10µF–47µF capacitors. |
| ICL7660IPAZ | 10mA output, fixed 10kHz, 55Ω output resistance, no shutdown or frequency control - legacy part with higher dropout and lower efficiency. | Suitable only for ultra-low-current biasing (e.g., op-amp nulling); incompatible with 50mA loads; requires larger capacitors and yields poorer efficiency (~75%). | Choose ICL7660IPAZ only for drop-in replacement in existing low-power designs where no redesign is permitted and load ≤10mA. |
Compared with MAX660ESA+, MAX861CSA+T trades 50mA output and frequency flexibility for smaller capacitors and lower quiescent current; compared with ICL7660IPAZ, it delivers 5× more current, 4.6× lower output resistance, and integrated shutdown - making it viable for modern portable instrumentation where size, efficiency, and versatility are critical.
Availability
MAX861CSA+T is available at Aetrix Electronics and suitable for portable medical instruments, hand-held test equipment, and operational-amplifier power supplies requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MAX861CSA+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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX860/MAX861 product line was designed to replace inductive DC-DC converters in space- and cost-sensitive applications, delivering efficient, inductorless voltage inversion and doubling for portable and battery-powered systems.
FAQ
What is the maximum output current of the MAX861CSA+T?
The MAX861CSA+T delivers up to 50mA continuous output current in both inverting and doubling configurations. This rating assumes proper capacitor selection (e.g., 4.7µF–68µF depending on FC setting), ambient temperature ≤+85°C, and input voltage ≥+2.5V (doubler) or ≥+1.5V (inverter). Exceeding 50mA may cause excessive output droop or thermal stress.
How do I configure the MAX861CSA+T for voltage doubling?
To configure the MAX861CSA+T as a voltage doubler, connect the LV pin to the OUT pin. Maintain VDD between +2.5V and +5.5V, and ensure SHDN is pulled high (to VDD) for normal operation. The output will be approximately +2×VDD under no load, dropping predictably with load due to the 12Ω output resistance - e.g., +5.0V input yields ~+9.4V at 50mA.
What are the three switching frequencies of the MAX861CSA+T and how are they selected?
The MAX861CSA+T offers 13kHz (FC = VDD), 100kHz (FC = GND), and 250kHz (FC = OUT). These frequencies directly determine external capacitor sizing and trade-offs between ripple, efficiency, and quiescent current. Selection is made solely by the FC pin voltage state - no external clock or resistor network is required.
Can the MAX861CSA+T replace an ICL7660 in an existing design?
Yes, the MAX861CSA+T can replace an ICL7660 with one wiring change: connect the ICL7660's OSC pin (floating) to VDD on the MAX861CSA+T to enable operation, and tie LV to GND for inverter mode. The MAX861CSA+T provides 5× higher output current, 4.6× lower output resistance, and shutdown capability - but requires verifying capacitor values for the chosen FC frequency.
What is the shutdown current specification for the MAX861CSA+T?
The MAX861CSA+T draws less than 1µA supply current when the SHDN pin is driven low. This ultra-low shutdown current makes it suitable for battery-powered applications requiring extended storage life or deep-sleep modes. During shutdown, internal circuitry is disabled, though reverse-current paths remain active depending on load configuration (e.g., VDD-to-OUT loads continue drawing current).
MAX861CSA+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:
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX861CSA+T FAQ
1.How can I place an order for MAX861CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX861CSA+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 MAX861CSA+T reliable?
The price and inventory of MAX861CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX861CSA+T is usually 5 days.
3.What payment methods are accepted for MAX861CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX861CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX861CSA+T?
MAX861CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX861CSA+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 MAX861CSA+T?
For technical support, including MAX861CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX861CSA+T requirements.
6.How does Aetrix verify that MAX861CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX861CSA+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 MAX861CSA+T meets industry standards.
7.What is the process for return or replacement of MAX861CSA+T?
All MAX861CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX861CSA+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 MAX861CSA+T part is unused and in its original packaging.
Return procedure for MAX861CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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